Relevant bibliographies by topics / Fluid boiler

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Fluid boiler'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Fluid boiler"

1

Merc, Jaroslav, and Augustin Varga. "Predictive Diagnostics of Wet Bottom Boilers Operational States by Calculation of Steam Coal Ash Fluid Temperature." Key Engineering Materials 669 (October 2015): 345–52. http://dx.doi.org/10.4028/www.scientific.net/kem.669.345.

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This article deals with the issue of steam coal ash fluid (or fusion) temperature evaluation by mathematical method, based on comparison of statistic values obtained by laboratory analysis. The ash fluid temperature is very important parameter for Wet Bottom Boilers operation states because of quality of slagging. The ash composition has the biggest impact to the operation effectiveness and reliability of the Wet Bottom Boilers. It can directly influence the boiler production. Importance of information on ash fluid temperature increased after more strict of NOx emission limits (below 600 mg/m3) become obliged. WBB were initially designed for optimal operation with high temperatures in combustion chamber, with a production of high amount of NOx (often about 1400 mg/m3). The ash fluid temperature is usually determined by laboratory only, but it requires certain time and costs. Authors tried to bring faster and easier way how to evaluate of ash fluid temperature with acceptable accuracy of the parameter as predictive diagnostics [6] of the future boiler operational states.
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Madejski, Paweł, and Norbert Modliński. "Numerical investigation using two different CFD codes of pulverized-coal combustion process characteristic in an industrial power plant boiler." E3S Web of Conferences 82 (2019): 01009. http://dx.doi.org/10.1051/e3sconf/20198201009.

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Steam boilers using the coal as a basic fuel are still one of the most important techniques used to generate electricity in Power Plants. Many activities connected with optimization of steam boilers operation, investigation of combustion efficiency using different fuels, control and reducing pollutants emission are observed. Numerical modeling of large steam boilers using Computational Fluid Dynamic method can be a very way to develop and verify effects of all activities regarding combustion process optimization. Numerical modeling results of the coal combustion process in the front wall coal-fired boiler are presented in the paper. The behavior of the flow of pulverized coal through the burners was analyzed, and the temperature and velocity distribution in the combustion chamber were reproduced in the simulation. Despite the fact that the attention has been focused on boiler simulation at nominal load, it is possible to perform numerical studies concerning the analysis of coal combustion at different boiler loads (minimum load and flexible boiler operation). Analysis of different fuels and their impact on the combustion process, as well as analysis of coal mills operation, coal particles size distribution and they impact on boiler operation can be performed using developed models.
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Adi Saputra, I. Nyoman Agus, I. Gusti Bagus Wijaya Kusuma, and I. Gusti Ngurah Priambadi. "Analisis Perbedaan Mesh Pada Simulasi Boiler PLTGU Tanjung Priok Berbasis CFD." Jurnal METTEK 6, no. 1 (April 30, 2020): 46. http://dx.doi.org/10.24843/mettek.2020.v06.i01.p06.

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Penelitian Analisis Perbedaan Mesh berbasis Computational Fluid Dynamic (CFD) ini dilakukan Pada Boiler PLTGU Tanjung Priok. Boiler atau reboiler dalam sistem PLTGU dikategorikan sebagai alat penukar kalor karena perpindahan panasnya dilakukan tanpa kontak langsung antara media pemanas dengan media yang dipanaskan. Fluida kerja pada boiler PLTGU Tanjung Priok berupa gas methane dan air. Penelitian ini bertujuan melihat jumlah pembagian elemen terhadap hasil simulasi dengan menggunakan dua model Studi konvergensi grid yaitu dengan grid kasar, dan yang paling optimal melalui hasil simulasi CFD. Metode yang digunakan mulai dari mendesain geometri boiler sesuai kondisi di lapangan menginput initial conditions dan boundry conditions. Data hasil penelitian yang sudah di lakukan pada simulasi boiler menunjukkan bahwa baik temperatur, tekanan dan kecepatan aliran memiliki nilai yang sama besar dan tidak di pengaruhi oleh pembagian elemen yang di lakukan pada saat proses meshing dari elemen yang paling kasar dengan jumlah total sebanyak 203.363 sampai pada tahap proses meshing dengan elemen teroptimal yang berjumlah sebanyak 1.491.428 berdasarkan hal tersebut maka proses simulasi yang dilakukan menjadi lebih efisien karena proses perhitungan data dari elemen yang lebih sedikit mendapatkan hasil yang sama dengan elemen yang lebih banyak. The research on Mesh Difference Analysis based on Computational Fluid Dynamic (CFD) was conducted at Tanjung Priok PLTGU Boiler. Boilers or reboilers in PLTGU systems are categorized as heat exchangers because the heat transfer is done without direct contact between the heating media and the heated media. The working fluid in the Tanjung Priok gas power plant boiler is in the form of methane gas and water. This study aims to look at the number of elements divided against the simulation results by using two grid convergence study models, namely with a coarse grid, and the most optimal through CFD simulation results. The method used starts from designing the boiler geometry according to the field conditions, inputting initial conditions and boundry conditions. Data from research that has been done on boiler simulations shows that both temperature, pressure and flow velocity have the same value and are not affected by the division of elements carried out during the meshing process of the most coarse elements with a total number of 203.363 up to the meshing process stage with the optimum elements totaling 1,491,428 based on this, the simulation process carried out becomes more efficient because the process of calculating data from fewer elements gets the same results with more elements.
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Samsudin, Salmi, Nuraini Abdul Aziz, Abdul Aziz Hairuddin, and Siti Ujila Masuri. "A Study on Bituminous Coal Base Acid Ratio to the Slagging Factor at Large Scale Boiler." International Journal of Heat and Technology 39, no. 3 (June 30, 2021): 833–40. http://dx.doi.org/10.18280/ijht.390317.

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Different types of coal have different characteristics and performances. In thermal coal plant, deposition of coal ash inside the furnace causes slag formation inside the boiler rear path and consequently reduces the heat transfer process and boiler efficiency. Besides, accumulation of ash on the boiler tube surfaces form layers of slags and blocks the flue gas flow out of the boiler. Therefore, the purpose of this study is to investigate the relationship between sub-bituminous coal base acid ratio towards the heat transfer process inside large-scale boilers. The base acid ratio for sub-bituminous coal is measured before firing inside large-scale boiler of studied the thermal plant which has a generation capacity of 700 MW. This study found correlation between high furnace rear path temperature (FRPT) that is observed to be above 800℃, with the build up of ash accumulation inside the boiler, for the studied coal. Thus, a high base acid ratio causes the accumulation of coal ash, thus reducing the heat transfer process which results in high FRPT of the boiler. Therefore, it proves that a base acid ratio is an indicator for coal performance during firing inside the boiler.
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TRAN, HONGHI, and DANNY TANDRA. "Recovery boiler sootblowers: History and technological advances." January 2015 14, no. 1 (February 1, 2015): 51–60. http://dx.doi.org/10.32964/tj14.1.51.

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Sootblowing technology used in recovery boilers originated from that used in coal-fired boilers. It started with manual cleaning with hand lancing and hand blowing, and evolved slowly into online sootblowing using retractable sootblowers. Since 1991, intensive research and development has focused on sootblowing jet fundamentals and deposit removal in recovery boilers. The results have provided much insight into sootblower jet hydrodynamics, how a sootblower jet interacts with tubes and deposits, and factors influencing its deposit removal efficiency, and have led to two important innovations: fully-expanded sootblower nozzles that are used in virtually all recovery boilers today, and the low pressure sootblowing technology that has been implemented in several new recovery boilers. The availability of powerful computing systems, superfast microprocessors and data acquisition systems, and versatile computational fluid dynamics (CFD) modeling capability in the past two decades has also contributed greatly to the advancement of sootblowing technology. High quality infrared inspection cameras have enabled mills to inspect the deposit buildup conditions in the boiler during operation, and helped identify problems with sootblower lance swinging and superheater platens and boiler bank tube vibrations. As the recovery boiler firing capacity and steam parameters have increased markedly in recent years, sootblowers have become larger and longer, and this can present a challenge in terms of both sootblower design and operation.
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Stoppato, Anna, and Alberto Benato. "Life Cycle Assessment of a Commercially Available Organic Rankine Cycle Unit Coupled with a Biomass Boiler." Energies 13, no. 7 (April 10, 2020): 1835. http://dx.doi.org/10.3390/en13071835.

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Organic Rankine Cycle (ORC) turbogenerators are a well-established technology to recover from medium to ultra-low grade heat and generate electricity, or heat and work as cogenerative units. High firmness, good reliability and acceptable efficiency guarantee to ORCs a large range of applications: from waste heat recovery of industrial processes to the enhancement of heat generated by renewable resources like biomass, solar or geothermal. ORC unit coupled with biomass boiler is one of the most adopted arrangements. However, despite biomass renewability, it is mandatory to evaluate the environmental impact of systems composed by boilers and ORCs taking into account the entire life cycle. To this purpose, the authors perform a life cycle assessment of a commercially available 150 kW cogenerative ORC unit coupled with a biomass boiler to assess the global environmental performance. The system is modelled in SimaPro using different approaches. Results show that the most impacting processes in terms of CO2 equivalent emissions are the ones related to biomass production and organic fluid leakages with 71% and 19% of the total. Therefore, being fluid release in the environment high impacting, a comparison among three fluids is also performed. Analysis shows that adopting a hydrofluoroolefin fluid with a low global warming potential instead of the hydrocarbon fluid as already used in the cycle guarantees a significant improvement of the environmental performance.
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MAAKALA, VILJAMI, and PASI MIIKKULAINEN. "Dimensioning a recovery boiler furnace using mathematical optimization." February 2015 14, no. 2 (March 1, 2015): 119–29. http://dx.doi.org/10.32964/tj14.2.119.

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Capacities of the largest new recovery boilers are steadily rising, and there is every reason to expect this trend to continue. However, the furnace designs for these large boilers have not been optimized and, in general, are based on semiheuristic rules and experience with smaller boilers. We present a multiobjective optimization code suitable for diverse optimization tasks and use it to dimension a high-capacity recovery boiler furnace. The objective was to find the furnace dimensions (width, depth, and height) that optimize eight performance criteria while satisfying additional inequality constraints. The optimization procedure was carried out in a fully automatic manner by means of the code, which is based on a genetic algorithm optimization method and a radial basis function network surrogate model. The code was coupled with a recovery boiler furnace computational fluid dynamics model that was used to obtain performance information on the individual furnace designs considered. The optimization code found numerous furnace geometries that deliver better performance than the base design, which was taken as a starting point. We propose one of these as a better design for the high-capacity recovery boiler. In particular, the proposed design reduces the number of liquor particles landing on the walls by 37%, the average carbon monoxide (CO) content at nose level by 81%, and the regions of high CO content at nose level by 78% from the values obtained with the base design. We show that optimizing the furnace design can significantly improve recovery boiler performance.
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Jiang, Yu, Kyeong-Hoon Park, and Chung-Hwan Jeon. "Feasibility Study of Co-Firing of Torrefied Empty Fruit Bunch and Coal through Boiler Simulation." Energies 13, no. 12 (June 12, 2020): 3051. http://dx.doi.org/10.3390/en13123051.

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Torrefied empty fruit bunch (EFB) co-firing is a promising technology to reduce emissions from coal-fired power plants. However, co-firing can influence the combustion and heat transfer characteristics in a coal boiler. In order to study the feasibility of co-firing application of torrefied EFB (T-EFB) in boilers, the combustion characteristics, gas emissions and heat flux distribution were analyzed, respectively. First, the kinetic parameters of T-EFB devolatilization and char oxidation were obtained by experimental analysis. Second, the computational fluid dynamics (CFD) analysis was applied to the actual 500 MWe boiler simulation to further evaluate the differences in the co-firing performance parameters (combustion characteristics and emissions) of the T-EFB and the heat transfer characteristics within the boiler. Numerical results show that T-EFB co-firing can improve the ignition characteristics of pulverized coal, reduce the formation of unburned particles. When the blending ratio was increased from 10% to 50%, significantly NOx (oxides of nitrogen) reduction (levels from 170 to 98 ppm at 6% O2) was achieved. At a blending ratio above 40%, boiler combustion efficiency decreases as the total heat flux of the boiler decreases due to an increase in the amount of unburned carbon. In addition, T-EFB co-firing can affect the heat transfer characteristics of the boiler.
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Aguilar Vizcarra, Duilio, Doris Esenarro, and Ciro Rodriguez. "Three Steps Mixed (Fire Tube–Water Tube) Vertical Boiler to Optimize Thermal Performance." Fluids 6, no. 3 (February 25, 2021): 93. http://dx.doi.org/10.3390/fluids6030093.

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The research aims to design and construct a new mixed vertical boiler (fire tube – water tube) with three gas passes. The strength of this technological innovation is in the best use of the thermic transmission receiving fluid (hot water, steam, thermal oil), this due to its multipurpose function of three steps using alternative fuels (Diesel, Liquid Petroleum Gas LPG, natural gas), by improving the thermal efficiency of the boiler its temperature is reduced with gases at low temperatures, which in turn also reduce environmental pollution. The methodology focuses on calculating the transfer area with the calculation method that will allow dimensioning the boiler, considering the calculation of losses and the fluid speed, with two defined procedures, the first for fire tube and water tube boilers. And another alternative. The results obtained allowed optimizing the thermal efficiency level, achieving very significant thermal efficiency results: With LPG 92.4% for hot water and 92.42% to generate steam in the same way with natural gas 90.25% for hot water and 90.24% to generate steam as well with Diesel 2; 89.21% for hot water and 89.31% to generate steam.
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Okumura, Koji. "Field Operation of Circulating Fluid Red Boiler." JAPAN TAPPI JOURNAL 46, no. 1 (1992): 168–73. http://dx.doi.org/10.2524/jtappij.46.168.

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Dissertations / Theses on the topic "Fluid boiler"

1

Millington, B. C. "A fundamental investigation of boiler-drum cyclone flowfields and performance." Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355385.

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Huang, Liangyu. "CFD modelling of condensing boilers for domestic use." Thesis, London South Bank University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265278.

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Hye, A. S. M. Abdul. "Computational fluid dynamics (CFD) study of co-firing of coal and pretreated biomass." Thesis, KTH, Energi- och ugnsteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-152907.

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This master thesis describes the co-firing concept, benefits and opportunities of pretreated biomass in pulverized coal boilers for industrial use. Burning fossil fuels, i.e. coal is under immense political pressure as European Union (EU) and other countries are trying to bring down the CO2 emission. Biomass combustion is already a proven technology and it plays a greater role in reducing CO2 emission. The main objective of this thesis is the brief study of computational fluid dynamics (CFD) modelling to examine the co-firing of greater amount of pretreated biomass and pulverized coal in a 200MWe pulverized coal boiler. Here, we exchange around 50 % of existing fuel in pulverized coal boiler with torrefied biomass. Torrefied biomass aids to increase the efficiency of existing coal boiler and cut down the CO2 emission. In this work, two cases of co-firing of pretreated biomass and coal have been investigated by CFD. Firstly, an experimental work was done in a laboratory scale to have few different types of torrefied biomass with different degrees of torrefaction. The devolatilization kinetics and char oxidation kinetics were also determined by experiments and other parameters have been calculated. One important aspect of this work has been to evaluate the performance of torrefaction based co-firing. Therefore, co-firing case has been compared to the 100 % coal feed case to understand the performance of torrefaction based co-firing. Furthermore, fluid flow, particles trajectories, heat transfer, and different emission behaviors have been studied. In addition, mechanisms of corrosion during co-firing have been studied and a guideline has been provided for corrosion model for analyzing the characteristics of alkali metals and their effects in co-firing coal boiler. The outcome from the CFD simulation indicated that boiler efficiency increases and the net CO2 emission reduced with increasing the biomass percentage in the co-firing system.
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Baranski, Jacek. "Physical and numerical modelling of flow pattern and combustion process in pulverized fuel fired boiler." Licentiate thesis, KTH, Materials Science and Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1533.

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This licentiate thesis describes development of modellingtools, experimental physical modelling and numerical modellingto simulate real combustion processes for advanced industrialutility boiler before and after retrofit.

The work presents extended study about formation,destruction and control of pollutants, especially NOx, whichoccur during combustion process.

The main aim of this work is to improve mixing process incombustion chamber. To do this, the optimization of placementand direction of additional air and fuel nozzles, the physicalmodelling technique is used. By using that method, it ispossible to obtain qualitative information about processes,which occur in the real boiler. The numerical simulationsverify the results from physical modelling, because duringmathematical modelling quantitative informations about flow andmixing patterns, temperature field, species concentration areobtained.

Two 3D cases, before and after retrofit, of pulverized fuelfired boiler at 125 MW output thermal power are simulated. Theunstructured mesh technique is also used to discretize theboiler. The number of grid was 427 656 before retrofit and 513362 after retrofit. The comparisons of results of numericalsimulation before and after retrofit are presented. The resultsfrom physical modelling and numerical simulation are alsoshown.

Results present that nozzles of additional air and fuel givea considerably better mixing process, uniform temperature fieldand CO2 mass fraction. The whole combustion chamber worksalmost as a "well stirred reactor", while upper part of boilerworks as a "plug flow reactor".

Differences between from measured of temperatures andpredicted temperatures are not too big, the maximum differenceis about 100 K. It seems, that calculated temperatures showgood agreement with measurement data.

The results illuminate the potential of physical andnumerical modelling methods as promising tools to deal with thecomplicated combustion processes, even for practicalapplication in the industry.

Keywords:air staging, fuel staging, boiler, furnace,computational fluid dynamics, numerical simulation, pollutants,physical modeling, pulverized fuel combustion.

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Martinek, Jan. "Fluidní kotel CFB na spalování dřevní biomasy o parametrech páry 150 t/h; 9,3 MPa; 530 °C." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232152.

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This diploma thesis deals with the control calculation of fluid biomass boilers with circulating fluidized bed. The introduction briefly introduced fluidized bed boilers and explained what biomass is. Furthermore there is a stoichiometric calculation of combustion. The calculation of the losses and the efficiency of the boiler is following. Desulphurization is calculated briefly. The main part is devoted to the design and calculation of individual heat exchanging surfaces: superheater P1, superheaters 2 and 3, the wall superheater, the return chamber, hanging tubes, economizer and air heater. At the end is calculated total tolerance boiler. Work is completed with a diagram of temperature of working media and combustion.
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Ferreira, Daniel José de Oliveira. "Modelagem de caldeira de recuperação química Kraft." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-26072013-122445/.

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O avanço da capacidade do processamento dos computadores e do desenvolvimento de métodos numéricos tem proporcionado ferramentas de modelagem, projeto e otimização cada vez mais eficientes para a constante melhoria de caldeiras de recuperação química Kraft. Dentre as técnicas utilizadas, os modelos CFD abrangentes tem sido empregados nos últimos anos para representar a operação da caldeira de recuperação considerando o maior número possível processos vinculados ao escoamento dos gases de combustão. O presente trabalho busca desenvolver um modelo CFD abrangente considerando o escoamento turbulento dos gases de combustão, o arraste das gotas de licor, a combustão homogênea dos voláteis em fase gasosa, as etapas de combustão heterogênea do licor preto e uma representação simplificada do leito carbonizado. Os resultados se mostraram coerentes com o comportamento apresentado na literatura. A simulação do modelo permite análise dos projetos e das operações da caldeira.
The advance of computer processing power and the development of numerical methods promote more efficient tools for modeling, design and optimization aiming to increase improvements in Kraft recovery boilers. Among the available techniques, the comprehensive CFD models have been applied in the last years to represent the recovery boiler operation considering as much as possible processes linked with flue gas flow. The objective of present work is the development of a comprehensive CFD model considering turbulent flue gas flow, black liquor droplets drag, volatiles homogeneous combustion in gas phase, the steps of heterogeneous black liquor combustion and the simplified interaction between flue gas flow and char bed. The results have good agreement with boiler behavior presented in the literature. The simulation of the comprehensive model allows the analysis of design and operations of the boiler.
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Bytešník, Jan. "Fluidní kotle s cirkulující fluidní vrstvou na spalování čisté dřevní hmoty." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229232.

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This master thesis designes the calculation of fluid boiler with specific part - the circular fluid bed. The heat is given by combustion of wood biomass. The thesis is devided into several parts. All necessary elementary results are going to be reached within these parts: an analysis of solid fuel, stechiometry calculation, discussion on output limits and the environmental point of view, definition of elemental heat losses and general heat efficiency, calculation and design of a combustion part and its heat loads and calculation of enthalpies with different ash concentrations. All these phases get to a successful design of the fluid boiler heat balance and sizes of heat-flow surfaces. The composition of the boiler shows the added drawing.
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Peronski, Lukasz. "Application of computational fluid dynamics in the design of heat exchangers for domestic central heating boilers." Thesis, University of Leeds, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612612.

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The aim of this study is to investigate the possible use of commercial Computational Fluid Dynamics (CFD) software in the design process of a heat exchanger for a domestic gas boiler. Fluid flow and heat transfer CFD simulations have been performed and validated. In general, a good agreement between the CFD simulations and the experimental results was observed. The porous media approach was used for approximating the water flow resistance characteristics in the sections of the heat exchanger in the flow distribution problems. This was in cases in which the direct CFD simulations of the water flow through these sections of the heat exchanger would require very large numerical meshes and computational resources. Also a method for designing a water flow distributor for the sectional parallel now heat exchanger is proposed. The method is based on Bernoulli's equation with the flow resistance characteristics of a single section of the heat exchanger gained from the CFD simulation of the water now through a single section of this heat exchanger. The performed CFD analyses provide very useful information with regards to the operational parameters and conditions in the heat exchanger under investigation, which would otherwise be very difficult. if not impossible, to obtain. Despite the great potential usefulness of the CFD simulation In the design process of heat exchangers, it is still not always considered a clear choice for use in the boiler industry, in order to aid the design process of heat exchangers for domestic central heating boilers. This is due to the relatively high cost of the CFD analyses and the fact that the boiler industry traditionally relies on design procedures based primarily on experimental techniques
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Polton, Cheriska. "Detailed model for robust feedback design of main steam temperatures in coal fired boilers." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/32972.

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Main steam temperatures play a significant role in large coal fired power plant operation. Ideally, main steam temperatures should be accurately controlled to protect the thick wall components against long term overheating and thermal stress while meeting the design conditions at the steam turbine inlet. Although high steam temperatures are beneficial for thermal efficiency, it accelerates creep damage in high temperature components which is detrimental to the life of components. Alternatively, low steam temperatures increase the moisture content at the last stage blades of the turbine, causing the blades to deteriorate and fail. Control of the outlet steam temperature according to design conditions at variable loads is maintained via a balance between heat input (flue gas temperature and mass flow rate), evaporator outlet steam mass flow and spray water. The present control philosophy accuracy of main steam temperatures at an Eskom coal fired power plant was evaluated and compared to the latest technology and control strategies. Improving and optimizing steam temperature controls ensures design efficiency while maintaining long term plant health. The level of spatial discretization applied in simplifying the real boiler for modelling purposes was approached at a relatively high level. The intention was to model normal operating conditions and certain transients such as variable heat input and load changes to see its effect on steam temperatures and to be able to evaluate the performance of different temperature control techniques. The main outcome of this project was to design a robust control system for a dynamic model of the boiler using sets of low order linear models to account for uncertainty. The main concepts, models and theories used in the development of this dissertation include: 1) A detailed thermo-fluid model developed using Flownex to have high fidelity models of the process under varying operating conditions. This model was used to test and evaluate the robust controller design. 2) System Identification in Matlab to construct mathematical models of dynamic systems from measured inputoutput data and identify linear continuous time transfer functions under all operating conditions [1]. 3) Quantitative Feedback Theory (QFT) to design controllers for an attemperator control system at various onload operating conditions. This design was used understand the engineering requirements and seeks to design fixed gain controllers that will give desired performance under all operating conditions. 4) The design of a valve position controller to increase the heat uptake in a convective pass, thereby improving efficiency: Excessive attemperation in the superheater passes is generally associated with high flue gas temperatures which decrease thermal efficiency. Therefore, robust control of the attemperation system leads to an increase in heat uptake between the flue gas and steam in the boiler, resulting in a reduction in the flue gas temperature leaving the boiler, thus improving efficiency. The robust QFT controllers were set up using the valve position control technique and were used to confirm the improvement of control performance. The theories mentioned above were used to understand the control performance under varying plant conditions using a standard cascaded arrangement. It incorporated robust control design and engineering requirements such as bandwidth, plant life, spray water and thermodynamic efficiency. The control effort allocated to each superheaterattemperator subsystem in the convective pass was designed as a multi-loop problem.
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Himes, Scott A. "Self-Organizing Fluid Flow Patterns in Crystalline Rock: Theoretical Approach to the Hydrothermal Systems in the Middle Fork of the Boise River." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3363.

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The thermal springs along the Middle Fork of the Boise River (MFBR) within the Atlanta lobe of the Idaho batholith discharge in discrete locations that appear to be part of self-organizing flow systems. Infiltrating water flows through Basin and Range fractures to depth where it is heated and ultimately discharged at the intersection of trans-Challis oriented faults along the MFBR. Isotopic compositions of the thermal waters have a linear trend with elevation suggesting that the recharge locations are near each thermal spring and the hydrothermal system is not one large interconnected system, but rather multiple individual hydrothermal systems. Water chemically evolves along the hydrothermal flow paths dissolving feldspars and precipitating secondary minerals. PHREEQC inverse modeling of the chemical evolution based on identified minerals within the system predicts positive volume changes in the pore space within the hydrothermal flow systems can occur. Precipitation of secondary minerals is likely to occur in the cooler, subsidiary, less-efficient fractures of the hydrothermal system. Flow areas calculated using heat flow, exponential decay, and a combination of the two, show that the topographic watershed is inadequate to accommodate the water supporting the thermal springs indicating that water is being captured from outside the watershed. The positive volume changes coupled with the water capture is evidence of positive feedback loops are active within the hydrothermal system providing a mechanism for self-organization to occur in the hydrothermal systems of granite.
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Books on the topic "Fluid boiler"

1

Mao, Tie. Simulation of the fluid flow around the primary air ports of a kraft recovery boiler. Ottawa: National Library of Canada, 1993.

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2

Dodd, C. V. Improved eddy-current inspection for steam generator tubing progress report for period January 1985 to December 1987. Washington, DC: Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1990.

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Dodd, C. V. Improved eddy-current inspection for steam generator tubing progress report for period January 1985 to December 1987. Washington, DC: Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1990.

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4

Pettigrew, M. J. Flow-induced vibration specifications for steam generators and liquid heat exchangers. Chalk River, Ont: Chalk River Laboratories, 1995.

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V, Ganapathy. BASIC programs for steam plant engineers: Boilers, combustion fluid flow, and heat transfer. New York: Dekker, 1986.

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Mendler, O. J. Loss of feed flow, steam generator tube rupture, and steam line break thermohydraulic experiments: MB-2 steam generator transient response test program. Washington, DC: U.S. Nuclear Regulatory Commission, 1986.

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Mendler, O. J. Loss of feed flow, steam generator tube rupture, and steam line break thermohydraulic experiments: MB-2 steam generator transient response test program. Washington, DC: U.S. Nuclear Regulatory Commission, 1986.

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Senʹ, L. I. Plenochnye teploobmennye apparaty sudovykh kotelʹnykh i opresnitelʹnykh ustanovok. Leningrad: "Sudostroenie", 1986.

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American Society of Mechanical Engineers. Winter Meeting. Thermal hydraulics of nuclear steam generators/heat exchangers: Presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Chicago, Illinois, November 27-December 2, 1988. New York, N.Y. (345 E. 47th St., New York 10017): The Society, 1988.

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International, Steam Generator and Heat Exchanger Conference (3rd 1998 Toronto Ont ). Proceedings of the Third International Conference on Steam Generators and Heat Exchangers: [a conference held in Toronto, Ontario, June 1998. Toronto: Canadian Nuclear Society, 1998.

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Book chapters on the topic "Fluid boiler"

1

Maloney, Kenneth, Susan, Leigh-Erin, Jeffrey, and Allen Xie. "Computational Fluid Dynamic Modeling and Field Results for Co-Firing Gas over Coal in a Stoker Boiler." In Challenges of Power Engineering and Environment, 886–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_165.

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Zadeh, F. Panahi, and M. Farzaneh Gord. "CFD Study on Flow Field inside B.I.P.C. Steam Boilers." In Computational Fluid Dynamics 2010, 937–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_127.

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Avery, William H., and Chih Wu. "Closed-Cycle OTEC Systems." In Renewable Energy from the Ocean. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195071993.003.0011.

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The Rankine closed cycle is a process in which beat is used to evaporate a fluid at constant pressure in a “boiler” or evaporator, from which the vapor enters a piston engine or turbine and expands doing work. The vapor exhaust then enters a vessel where heat is transferred from the vapor to a cooling fluid, causing the vapor to condense to a liquid, which is pumped back to the evaporator to complete the cycle. A layout of the plantship shown in Fig. 1-2. The basic cycle comprises four steps, as shown in the pressure-volume (p—V) diagram of Fig. 4-1. 1. Starting at point a, heat is added to the working fluid in the boiler until the temperature reaches the boiling point at the design pressure, represented by point b. 2. With further heat addition, the liquid vaporizes at constant temperature and pressure, increasing in volume to point c. 3. The high-pressure vapor enters the piston or turbine and expands adiabatically to point d. 4. The low-pressure vapor enters the condenser and, with heat removal at constant pressure, is cooled and liquefied, returning to its original volume at point a. The work done by the cycle is the area enclosed by the points a,b,c,d,a. This is equal to Hc–Hd, where H is the enthalpy of the fluid at the indicated point. The heat transferred in the process is Hc–Ha Thus the efficiency, defined as the ratio of work to heat used, is: . . . efficiency(η)=Hc–Hd/Hc–Ha (4.1.1) . . . Carnot showed that if the heat-engine cycle was conducted so that equilibrium conditions were maintained in the process, that the efficiency was determined solely by the ratio of the temperatures of the working fluid in the evaporator and the condenser. . . . η=TE–Tc/TE (4.1.2) . . . The maximum Carnot efficiency can be attained only for a cycle in which thermal equilibrium exists in each phase of the process; however, for power to be generated a temperature difference must exist between the working fluid in the evaporator and the warm-water heat source, and between the working fluid in the condenser and the cold-water heat sink.
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Souza, Jairo Z., Leonardo P. Rangel, Henrique C. Monteiro, Marcelo Bzuneck, Luiz Felippe, and Artur R. F. Ellwanger. "Numerical Simulation of Coal Boiler at Electric Thermal Plants Using Computational Fluid Dynamics." In Computer Aided Chemical Engineering, 225–30. Elsevier, 2009. http://dx.doi.org/10.1016/s1570-7946(09)70258-5.

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Schulenberg, Thomas. "Energy Conversion Using the Supercritical Steam Cycle." In Advanced Applications of Supercritical Fluids in Energy Systems, 458–80. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2047-4.ch014.

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A supercritical steam (or Rankine) cycle is used today for more most of the new coal-fired power plants. More recently, it has been proposed as well for future water-cooled nuclear reactors to enhance their efficiency and to reduce their costs. This chapter provides the technical background explaining this technology. Some criteria for boiler design and operation, like drum or once-through boiler design, fixed or sliding pressure operation and coolant mixing, are discussed in general to explain the particular challenges of supercritical steam cycles. Examples of technical solutions are given for two large-scale applications: a coal-fired power plant and a supercritical water-cooled reactor, both producing around 1000 MW electric power.
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Reithner, R., and H. Müller. "CFD studies for boilers." In Computational Fluid and Solid Mechanics 2003, 988–91. Elsevier, 2003. http://dx.doi.org/10.1016/b978-008044046-0.50241-4.

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Schulenberg, Thomas. "Energy Conversion Using the Supercritical Steam Cycle." In Handbook of Research on Advancements in Supercritical Fluids Applications for Sustainable Energy Systems, 659–81. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5796-9.ch018.

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A supercritical steam (or Rankine) cycle is used today for more most of the new coal-fired power plants. More recently, it has been proposed as well for future water-cooled nuclear reactors to enhance their efficiency and to reduce their costs. This chapter provides the technical background explaining this technology. Some criteria for boiler design and operation, like drum or once-through boiler design, fixed or sliding pressure operation, and coolant mixing, are discussed in general to explain the particular challenges of supercritical steam cycles. Examples of technical solutions are given for two large-scale applications: a coal-fired power plant and a supercritical water-cooled reactor, both producing around 1000 MW electric power.
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"Fluids." In Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 2, Third Edition, 645–72. ASME Press, 2009. http://dx.doi.org/10.1115/1.802700.ch36.

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"Fluids." In Companion Guide to the ASME Boiler & Pressure Vessel Code, Volume 2, Second Edition, 575–90. ASME Press, 2006. http://dx.doi.org/10.1115/1.802191.ch36.

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"Fluids." In Continuing and Changing Priorities of the ASME Boiler & Pressure Vessel Codes and Standards, 8–1. ASME Press, 2014. http://dx.doi.org/10.1115/1.860199_ch8.

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Conference papers on the topic "Fluid boiler"

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Gurski, Bill, John Guarco, and Nando Nunziante. "Solid Fuel to Natural Gas Conversions for Circulating Fluid Bed Boilers." In ASME 2014 Power Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/power2014-32258.

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Recent discoveries of vast natural gas reserves in the United States have led to increased domestic natural gas production, resulting in lower prices. Utility and large industrial facilities are performing solid fuel conversions on their boilers to natural gas as a cost-effective and efficient fuel solution. Natural gas is not only economically beneficial but also environmentally efficient with cheaper prices and reduced SO2, NOx, and CO2 emissions. The Environmental Protection Agency (EPA) has recently released mandatory requirements that directly affect the cost effective operation of solid fuel boilers, resulting in natural gas becoming a more economically appealing choice of fuel for facility operators. As more facilities consider boiler fuel conversions, it is important to understand all facets of the conversion, from the thermal evaluation of the boiler, to the complete design, supply and installation of the new firing system. Zeeco will provide specific details and recommended practices from a recent Circulating Fluidized Bed (CFB) Boiler solid fuel conversion to natural gas application designed for 1.3 billion Btu/hr of heat input for the maximum continuous steam rating. The information will detail the boiler conversion from a solid fuel fluid bed to a 100% natural gas fired boiler design. Thermal performance results, design and supply of the complete new gas firing system, and installation conversion assistance for the boiler modifications and firing system installation details are also provided.
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Hemphill, H., S. Maharjan, J. Fang, and L. Weiss. "Waste Heat Use Through Microfabrication and Micro System Development." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90197.

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To effectively harvest waste heat from larger devices, a MEMS-based boiler is fabricated to boil working fluids for use in a low temperature steam system. The boiler is designed and fabricated to collect waste heat and drive working fluid phase change through novel microstructures. This boiled working fluid can then be made available for expansion by other MEMS-based components like piezoelectric membranes or cantilevers. Two different boiler designs are studied and compared in these experiments. Both designs rely on capillary channels to pump working fluid from surrounding reservoirs out across heated boiling surfaces. First, a baseline silicon device is fabricated using standard RIE techniques to produce silicon capillary channels. Channel widths of 300 and 100 μm are studied with maximum aspect ratios of 1:1. Improved aspect ratio capillary channels are investigated through the use of SU-8 polymer structures. The maximum aspect ratios of the SU-8 based channels are 20:1 with channel widths down to 10 μm. SU-8 based boilers deliver improved performance compared to their silicon counterparts. The maximum mass transfer rate was 4.49 mg/s for SU-8 channels with 20:1 aspect ratios. By contrast, the maximum mass transfer rate was 3.18 mg/s for silicon capillary channels with 1:1 aspect ratios. Working fluids like 3M™ HFE 7200 are used in these experiments.
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Lu, G. C., Z. G. Zuo, S. H. Liu, Y. Z. Fan, and Y. L. Wu. "Numerical studies of the influence of casing shape on the hydraulic performance of a centrifugal boiler circulating pump." In 2014 ISFMFE - 6th International Symposium on Fluid Machinery and Fluid Engineering. Institution of Engineering and Technology, 2014. http://dx.doi.org/10.1049/cp.2014.1151.

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Zhu, Zaixing, Jiemin Zhou, Ying Wang, Ping Zhou, and Aichun Ma. "Numerical Simulation on Fluid Flow and Combustion in a Subcritical Pressure Boiler With Various Hybrid Coal." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68927.

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With a 300t/h Hg1025/18.2-YM13 sub-critical natural circulation tangentially corner-fired boiler serving as a prototype, a realizable k–ε turbulent mathematical model was established. This model used computational fluid dynamics software FLUENT6.2 and unstructured mesh generating technique of Gambit to reduce numerical false diffusion of the computational results. The fluid flow, heat transfer and combustion processes in the boiler were investigated numerically with different types of coal. The simulation data was compared and analyzed. The influences of primary air ratio, excess air ratio, pulverized fuel feeder on the combustion processes have been studied. These results could be of great help in the operation of tangentially fired furnace of pulverized coal boilers.
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Wei, Bing, and Dong Zhou. "Validation of Hydrodynamic Stability of Supercritical Once-Through Boiler." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68280.

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Operating safety is one of the most important things to supercritical once-through boilers. To study the hydrodynamic characteristics of fluid in water walls of supercritical once-through boilers and to find out the instable factors will be of great significance to boiler operation. In this paper the mathematical models for hydrodynamic characteristics of fluid in water walls are established. With an example of 600MW boiler, by using the calculation program, the hydrodynamic characteristics curves without and with the throttles at the inlets of the water walls at different operating conditions are presented, the fluid flow instability and the reasons are analyzed. The calculation results show that the boiler operates stably and safely at 100% MCR (Maximum Continuous Rating) condition, the hydrodynamic instability exists at low heating loads of 30% MCR. The method of installing the throttles at the inlets of the water wall pipes will increase the parabola characteristics, help to improve the fluid instability to a certain stable extent, but due to the small curve slopes at low mass flowrates, still need to pay more attention to the low heating loads operation. The existence of gravity pressure head is good to the stability of the vertical upward flow.
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Prather, K., H. Hemphill, I. Pjescic, C. Tranter, J. Dorton, F. Elliott, and L. Weiss. "Novel MEMS-Based Boiler Development for Low Temperature Applications." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10500.

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A novel MEMS-based boiler is fabricated and tested. The device is designed to operate from low-temperature heat sources using capillary action channels. The channels supply working fluid to the heated boiler surface, eliminating the need for traditional working fluid pumps. Two basic types of construction are evaluated. First, a more traditional silicon-based device is constructed and tested. Fabrication of the silicon boiler utilizes standard micro-fabrication practices. Second, a copper-based unit is fabricated and tested. Fabrication of the copper boiler focusses on low-cost techniques performed outside the scope of traditional micro-fab procedures. Results of these tests show the promise of non-traditional metals in low-temperature MEMS-based applications. The effectiveness of the copper boilers is shown to be 60% greater than their silicon counter parts. The copper-based prototypes exhibited a maximum evaporation rate for working fluid pumped across the boiling surface of 4.21 mg/sec.
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Kang, Sae Byul, Hyun Hee Lee, Kyu Sung Choi, Jong Jin Kim, Jae Joon Choi, Byung Joo Lee, Jong Hoon Kim, and Chi Kwan Kim. "NOx and O2 Measurements by using Smart NOx Sensor for Industrial Boiler." In International Conference of Fluid Flow, Heat and Mass Transfer. Avestia Publishing, 2017. http://dx.doi.org/10.11159/ffhmt17.118.

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Aida, Kiyoshi, Keisuke Minagawa, and Satoshi Fujita. "Research and Development of Viscous Fluid Dampers for Improvement of Seismic Resistance of Thermal Power Plants: Part 9 — Investigation Regarding Damage Between Furnace and Cage." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21268.

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Abstract Boilers in coal-fired thermal power plants were often damaged by earthquakes such as the Great East Japan Earthquake in 2011. Since the coal-fired thermal power generation has been one of the main power generation methods after the Great East Japan Earthquake, mitigation of damage of boilers in thermal power plants by earthquakes is the very important subject in order to recover our daily life immediately after strong earthquakes. Meanwhile, a boiler in a coal-fired thermal power plant was damaged by Hokkaido Eastern Iburi Earthquake in 2018, and this damage was one of the causes of Hokkaido’s prefecture-wide blackout. According to a report by an electric power company, a damage occurred between a furnace and a cage of the boiler. In general, lengths, shapes, weights and so on of a furnace are different from a cage, so vibration characteristics and seismic response are different as well. Thus the connecting part between the furnace and the cage is a weak point in the boiler, and the damages often occurred there. Therefore this paper investigates seismic response of a boiler by a numerical analysis using a frame model from the viewpoint of the damage of the furnace and the cage. Various seismic waves were used as input waves in order to investigate the influence of the input wave. A result of a modal analysis was also provided in this paper.
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Holubcik, Michal, Nikola Kantova, Bystrik Cervenka, and Juraj Trnka. "Mathematic model for prediction of heat output of small boiler depending on various aspects." In 38TH MEETING OF DEPARTMENTS OF FLUID MECHANICS AND THERMODYNAMICS. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114743.

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Tang, Guangwu, Bin Wu, Kurt Johnson, Albert Kirk, and Chenn Q. Zhou. "Simulation of an Industrial Tangentially Fired Boiler Firing Metallurgical Gases." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63219.

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In industrial environments, boiler units are widely used to supply heat and electrical power. At an integrated steel mill, industrial boilers combust a variable mixture of metallurgical gases combined with additional fuels to generate high-pressure superheated steam. Most tangentially fired boilers have experienced water wall tube failures in the combustion zone, which are thought to be caused by some deficiency in the combustion process. The challenge faced in this present process is that there are very limited means to observe the boiler operation. In this study, a three-dimensional Computational Fluid Dynamics (CFD) modeling and simulation of an industrial tangentially fired boiler firing metallurgical gases was conducted. Simulation results obtained from the assembled CFD model were validated by industrial experiments. A quick comparison of the flame shape from the simulation to the actual flame in the boiler showed a good agreement. The flow field and temperature distribution inside the tangentially fired boiler were analyzed under the operation conditions, and a wall water tube overheating problem was observed and directly related to the flow characteristics.
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Reports on the topic "Fluid boiler"

1

John L. Marion and Nsakala ya Nsakala. GREENHOUSE GAS EMISSIONS CONTROL BY OXYGEN FIRING IN CIRCULATING FLUID BED BOILERS (Phase II--Evaluation of the Oxyfuel CFB Concept). Office of Scientific and Technical Information (OSTI), November 2003. http://dx.doi.org/10.2172/883158.

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