Relevant bibliographies by topics / Thermal computation of boiler

Contents

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

Academic literature on the topic 'Thermal computation of boiler'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Thermal computation of boiler"

1

Chengguo, Fu, Feng Yipeng, Tian Yishui, Liang Mingchao, and Zhang Zhengchuan. "Design of a 1 t/h Biomass Chain Boiler and ιts Fuel Adaptability Analysis." Journal of Engineering Science and Technology Review 13, no. 5 (2020): 132–42. http://dx.doi.org/10.25103/jestr.135.17.

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The arch is an important component of a biomass boiler. Initial arch design of most boilers is generally gained through manual computation, thus resulting in uncertain reasonability of flue gas flow. Moreover, biomass fuels in the market have instable characteristics, which influence the utilization of biomass energies considerably. To address the problems concerning reasonable flue gas flow caused by the collaborative design of arch and air staging and the combustion adaptability of fuels, a cold modeling experiment of a 1 t/h biomass boiler under different staged air distribution ratios when the rear arch coverage varies was conducted using Fluent software in this study after thermal performance computation and initial structural design of grate and furnace. Furthermore, a boiler performance test based on main fuels and a combustion adaptation test of auxiliary fuels were also performed. The experiments show that the best flue gas flow in the furnace is achieved when the rear arch coverage is 60% and the primary–secondary air distribution ratio is 4:6. The mean boiler efficiency and the mean boiler heat output are 81.26% and 715.76 kW/h by using Pinus koraiensis pellets, wood–straw mixed pellets, and cotton straw briquettes as main fuels; and the tested pollutant emissions are in compliance with the limits of the national standard. The results of the combustion adaptation test reveal that the excessive particle size, the high ash content and the relatively low calorific value of biomass molded fuels are all against the combustion of biomass boilers. Fuel upgrading based on washing process and other methods is suggested. This study can provide references to the performance optimization of traditional small-scale biomass chain heating boilers.
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He, Yang, and Su Fen Li. "Research on the On-Line Model for Energy Efficiency Diagnosis of Thermal Power Pulverized Coal Boiler." Advanced Materials Research 320 (August 2011): 542–47. http://dx.doi.org/10.4028/www.scientific.net/amr.320.542.

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This paper presents one on-line model for energy efficiency calculation and analysis. The computation model of combustion rate and other related physical and chemical equations were introduced to the heat balance computing model of boiler. It established one on-line model of thermal process, which can provide the functional relationship completely in real-time measurable variables to the calculation of energy efficiency. And on that basis, the theory on deviation analysis was introduced to establish the model for energy efficiency quantitative analysis to calculate the single-factor distributed consuming difference. The situation of the CG-220/9.81-M boiler’s energy efficiency was calculated and analyzed with the diagnosis model. The calculation errors of thermodynamic parameters related and the errors between the lumped energy efficiency deviation and the sum of single-factor distributed efficiency deviation were both small. The model is reasonably accurate. The on-line model for energy efficiency diagnosis of thermal power pulverized coal boiler was established.
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Gómez, Miguel, Rubén Martín, Joaquín Collazo, and Jacobo Porteiro. "CFD Steady Model Applied to a Biomass Boiler Operating in Air Enrichment Conditions." Energies 11, no. 10 (September 21, 2018): 2513. http://dx.doi.org/10.3390/en11102513.

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A numerical model is proposed to perform CFD simulations of biomass boilers working in different operating conditions and analyse the results with low computational effort. The model is based on steady fluxes that represent the biomass thermal conversion stages through the conservation of mass, energy, and chemical species in the packed bed region. The conversion reactions are combined with heat and mass transfer submodels that release the combustion products to the gas flow. The gas flow is calculated through classical finite volume techniques to model the transport and reaction phenomena. The overall process is calculated in a steady state with a fast, efficient, and reasonably accurate method, which allows the results to converge without long computation times. The modelling is applied to the simulation of a 30 kW domestic boiler, and the results are compared with experimental tests with reasonably good results for such a simple model. The model is also applied to study the effect of air enrichment in boiler performance and gas emissions. The boiler operation is simulated using different oxygen concentrations that range from 21% to 90% in the feeding air, and parameters such as the heat transferred, fume temperatures, and emissions of CO, CO2, and NOx are analysed. The results show that with a moderated air enrichment of 40% oxygen, the energy performance can be increased by 8%, CO emissions are noticeably reduced, and NOx remains practically stable.
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Ibraheem, Amjd, and Ferenc Szodrai. "Numerical Model Analysis of Natural Gas Combustion Burners." International Journal of Engineering and Management Sciences 4, no. 1 (March 3, 2019): 67–71. http://dx.doi.org/10.21791/ijems.2019.1.9.

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Traditional power plants still the dominating power source for all the major industries and powerdemanding facilities, the most crucial facility for the whole plant operations is the industrial boiler which generatessteam, heating energy or electrical power. Boilers generate energy by combustion. The improvement of combustion efficiency could greatly influence the energy consumption and will make the boiler more efficient and cleaner (less emissions), that’s why it is important to understand the combustion and thermal flow behaviours inside the boiler. Beside experimental testing, computational work nowadays becoming more and more important due to lower cost and acceptable accuracy with minimum error. With numerical calculations method, the computational model created by a Computational Fluid Dynamics (CFD) software could reduce a lot of trial and error on experimental work. In this paper utilizing the ANSYS FLUENT 19.1 software to make crate the combustion model. The ratio of air to fuel mixture, the equivalency factor, mass flow rate of the mixture, velocity, mass fractions of the mixture components (fuel and air) and their temperatures will serve as the input parameter while the exhaust gase component mass fraction, temperature, mass flow and velocity will be monitored.
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Naď, Martin, Zdeněk Jegla, Tomáš Létal, Pavel Lošák, and Jiří Buzík. "Thermal load non-uniformity estimation for superheater tube bundle damage evaluation." MATEC Web of Conferences 157 (2018): 02033. http://dx.doi.org/10.1051/matecconf/201815702033.

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Industrial boiler damage is a common phenomenon encountered in boiler operation which usually lasts several decades. Since boiler shutdown may be required because of localized failures, it is crucial to predict the most vulnerable parts. If damage occurs, it is necessary to perform root cause analysis and devise corrective measures (repairs, design modifications, etc.). Boiler tube bundles, such as those in superheaters, preheaters and reheaters, are the most exposed and often the most damaged boiler parts. Both short-term and long-term overheating are common causes of tube failures. In these cases, the design temperatures are exceeded, which often results in decrease of remaining creep life. Advanced models for damage evaluation require temperature history, which is available only in rare cases when it has been measured and recorded for the whole service life. However, in most cases it is necessary to estimate the temperature history from available operation history data (inlet and outlet pressures and temperatures etc.). The task may be very challenging because of the combination of complex flow behaviour in the flue gas domain and heat transfer phenomena. This paper focuses on estimating thermal load non-uniformity on superheater tubes via Computational Fluid Dynamics (CFD) simulation of flue gas flow including heat transfer within the domain consisting of a furnace and a part of the first stage of the boiler.
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Yang, Dong, Long Wang, Yanshuang Bi, Beibei Xie, Gang Wang, and Danhua Yao. "ICOPE-15-C004 Thermal-hydraulic analysis and metal temperature computation for the water wall of a 1000MW ultra supercritical tower boiler with double reheat." Proceedings of the International Conference on Power Engineering (ICOPE) 2015.12 (2015): _ICOPE—15——_ICOPE—15—. http://dx.doi.org/10.1299/jsmeicope.2015.12._icope-15-_121.

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Polesek-Karczewska, Sylwia, Izabela Wardach-Święcicka, Dariusz Kardaś, and Tomasz Turzyński. "Application of a Lumped Multi-Section Model for Analyzing the Thermal Performance of a Small-Scale Biomass Boiler." Journal of Thermal Science 30, no. 3 (March 13, 2021): 1034–45. http://dx.doi.org/10.1007/s11630-021-1385-8.

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AbstractThe stationary lumped-cell model was developed and used to simulate the thermal characteristics of domestic biomass boiler with helically coiled tube heat exchanger (HCHE). The device serves as the heat source for ORC (Organic Rankine Cycle) unit and utilizes the thermal oil as the medium transferring the heat to the unit. Most of studies available in the literature refer to the CFD simulations for water flow in tube coils or in one- or two-turn coil elements. These investigations are basically focused on the determination of Nusselt number. The proposed herein model aims at determining the thermal performance of flue gas-oil HCHE while providing low CPU time. To demonstrate the model possibilities, it was used to predict the flue gas temperatures at the inlet and outlet from the heat exchange zone, based on measurement data regarding the outlet temperature of thermal oil. Six test series were considered. The computation results appeared to be in satisfactory agreement with experimental results (the discrepancies do not exceed 12%). The investigations showed that the used approach may be recommended as an alternative method that allows for fast prediction of thermal parameters for units of complex geometries, in particular the multi-coil heat exchangers.
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Kravets, Taras, Yevhen Miroshnychenko, and Andrii Kapustianskyi. "Enhancement of Technical and Economic Indicators of Power-Generating Units of Thermal Power Plants by Eliminating Flue Gas Recirculation." Energy Engineering and Control Systems 7, no. 1 (2021): 26–31. http://dx.doi.org/10.23939/jeecs2021.01.026.

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Boiler units at Ukrainian thermal power plants need to be modernized or replaced in the short run, as this is important for the national energy security. The authors determined one of possible ways to improve the efficiency indicators of coal-fired boiler units and power generating units as a whole up to the values exceeding the design ones. This variant of improvement consists in abandoning the technology of using flue gas as drying agent in pulverized coal systems and replacing it with direct discharge of the gas flow into the boiler furnace. Numerous computations were carried out to study the change of efficiency indicators and manoeuvrability of power generating units due to the replacement of the ball mill pulverizing system using flue gases for coal drying with the scheme including ball-and-race mills that use hot air as drying agent.
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Trávníček, Petr, Radovan Kukla, Tomáš Vítěz, and Jan Mareček. "Experimental determination of temperatures of the inner wall of a boiler combustion chamber for the purpose of verification of a CFD model." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, no. 1 (2011): 235–42. http://dx.doi.org/10.11118/actaun201159010235.

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The paper focuses on the non-destructive method of determination of temperatures in the boiler combustion chamber. This method proves to be significant mainly as regards CFD (Computational Fluid Dynamics) simulations of combustion processes, in case of which it is subsequently advisable to verify the data calculated using CFD software application with the actually measured data. Verification of the method was based on usage of reference combustion equipment (130 kW) which performs combustion of a mixture of waste sawdust and shavings originating in the course of production of wooden furniture. Measuring of temperatures inside the combustion chamber is – considering mainly the high temperature values – highly demanding and requires a special type of temperature sensors. Furthermore, as regards standard operation, it is not possible to install such sensors without performing structural alterations of the boiler. Therefore, for the purpose of determination of these temperatures a special experimental device was constructed while exploiting a thermal imaging system used for monitoring of the surface temperature of outer wall of the reference boiler. Temperatures on the wall of the boiler combustion chamber were determined on the basis of data measured using the experimental device as well as data from the thermal imaging system. These values might serve for verification of the respective CFD model of combustion equipment.
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Fueyo, N., V. Gambo´n, C. Dopazo, and J. F. Gonza´lez. "Computational Evaluation of Low NOx Operating Conditions in Arch-Fired Boilers." Journal of Engineering for Gas Turbines and Power 121, no. 4 (October 1, 1999): 735–40. http://dx.doi.org/10.1115/1.2818534.

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In the present paper, a computational model is used to simulate the aero-dynamic, thermal, and chemical conditions inside an arch-fired coal boiler. The model is based on the Eulerian-Eulerian concept, in which Eulerian conservation equations are solved both for the gas and the particulate phases. A NOx formation and destruction submodel is used to calculate the local concentration of NO. The model is used to simulate a range of operating conditions in an actual, 350 MW, arch-fired boiler, with the aim of reducing, using primary measures, the emissions of NOx. The model results shed some light on the relevant NOx-formation mechanisms under the several operating conditions. Furthermore, they correlate well quantitatively with the available field measurements at the plant, and reproduce satisfactorily the tendencies observed under the different operating modes.
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Dissertations / Theses on the topic "Thermal computation of boiler"

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Soľár, Slavomír. "Roštový parní kotel s přirozenou cirkulací na spalování slámy z pšenice,žita a ječmene." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232154.

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The main aim of this diploma thesis is to proceed a design of grate steam boiler for grain straw combustion with 15,6 MJ/kg of fuel efficiency. Steam power of boiler is 15 t/h, pressure of overheated steam is 5 MPa, temperature of overheated steam is 415 °C and temperature of inlet water is 125 °C. The estimation is based on proportioning of draughts and segments of boiler and on thermal computation. Verification of divergence of thermal balance is going to constate accuracy of boiler design.
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Gwebu, Excellent Zibhekele. "Transient boiler heat exchanger thermal behaviour analysis." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13230.

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Includes bibliographical references.
Coal fired power plants that were built in the past four decades are aging. The main aging mechanisms are creep and thermal fatigue. Creep results from the high temperatures at which the components operate. Thermal fatigue is due to thermal stresses and these stresses result from temperature gradients within the material. Cycling of these thermal stresses accelerate the creep in a process called creep- fatigue aging. The boiler and its final heat exchangers and headers are the main components that are affected by these mechanisms. The aging of these components results in high maintenance costs, reduction of the plant reliability and availability, and contribute to increased safety risks for the plant and personnel. Therefore, there is a need to understand the steady state and dynamic behaviour of the components of these plants in order to predict the stresses that the material experience. This report discusses an investigation to the possibility of modelling the thermal dynamic behaviour of typical boiler heat exchanger components which have to withstand the highest temperature of a Pulverised Fuel Rankine cycle power plant. Thus, illuminating the issues that need to be addressed in modelling such heat exchangers. Modelling approaches of heat exchangers are systematically presented, starting with the use of exact analytical solutions. This is followed by the application of finite volume numerical method. Finishing off with the use of the Flownex software. The exact analytical solutions are used to characterise the transient temperature distribution in solid materials with simplified heat transfer, highlighting the dependence of the solutions on the Fourier number and Biot number. These solutions are further used to calculate thermal stresses generated in the material, illustrating the relationship between thermal stresses and temperature gradients. Furthermore, a finite volume solution is applied to modelling an infinitely long tube. I t is illustrated that for transient conduction heat transfer problems, the solution depends on both physical space discretisation and time- wise discretisation. The numerical solution is verified against the exact analytical solution. Finally, the Flownex software is used to illustrate the issues that need to be addressed when modelling the transient behaviour of a heat exchanger . For this purpose only the average area discretisation scheme is used since it allows for any generic solid structure to be modelled, provided that the appropriate level of discretization is applied. The Flownex modelling starts by modelling transient conduction heat transfer within an infinitely long tube. The Flownex solution is verified against the finite volume numerical solution. The Flownex solution depends on thickness discretisation, especially for thick cylindrical components. Finite tubes are also modelled on Flownex including axial discretisation and layout simplification of the tubes. Flownex is also used to model a heat exchanger bundle using two methods; a tube by tube method and a method that involves the combination of all ii the tubes into one tube. The product of the thermal resistance and the capacitance of the system governs the transient simulations for both methods.
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Wain, Susan Elizabeth. "Thermal and mechanical properties of pulverised fuel boiler slags." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/8209.

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Tan, Geng. "Cooling characteristics and thermal properties of kraft recovery boiler smelt." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0027/MQ50374.pdf.

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Nikfarman, Hanieh. "Determination of thermal conductivity of recovery boiler char bed materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ58746.pdf.

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Saripalli, Raja. "Simulation of combustion and thermal-flow inside an industrial boiler." ScholarWorks@UNO, 2004. http://louisdl.louislibraries.org/u?/NOD,144.

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Thesis (M.S.)--University of New Orleans, 2004.
Title from electronic submission form. "A thesis ... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Mechanical Engineering."--Thesis t.p. Vita. Includes bibliographical references.
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Geddes, David John. "Neural network based co-ordinated control of a power plant boiler." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264782.

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Barakat, Magdi H. "Computation of indoor airflow for thermal comfort in residential buildings." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/23308.

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Ergun, Huseyin. "Design Of A High Temperature Erosion Apparatus For Testing Of Boiler Tubes." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612660/index.pdf.

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In this thesis an apparatus is designed which enables the testing of thermal power plant boiler tubes against erosion. The apparatus makes use of a tube sample directly cut from the boiler tubes and simulates conditions similar to those prevailing in boilers in lignite fired power plants. The apparatus is composed of three components
a furnace for heating the sample, a loading system which allows application of tensile stresses while allowing the rotation of the sample, and a particle blower that delivers abrasive particles to the surface of the sample. The abrasive material used in the test is mixture of oxides, 90% of which is Al2O3 and the average particle size is approximately 300 µ
m. The unit as designed would allow testing of boiler tubes up to a temperature of 650 C, and particle velocity of up to 50 m/s. The apparatus as tested at room temperatures for four identical samples have yielded very similar erosion values based on measurement of weight loss. At elevated temperature, erosion could be measured by a thickness loss since the oxidation that occurs complicates the erosion measurement. Two economizer material
P235GH and 16Mo3 were tested at 500oC with particle velocity of 10 m/s. The testing has shown that 16Mo3 has better performance than P235GH, the erosion rate differing by 20 percent.
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Wang, Zhongxiao. "Parallel computation for reservoir thermal simulation An overlapping domain decomposition approach /." Ann Arbor, Mich. : Proquest, 2005. http://proquest.umi.com/pqdweb?index=0&did=954046251&SrchMode=1&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1187901937&clientId=57025.

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Books on the topic "Thermal computation of boiler"

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Özcan, Selçuk. Recovery boiler fireside deposit thermal shock resistance and thermal conductivity. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1992.

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Tan, Geng. Cooling characteristics and thermal properties of kraft recovery boiler smelt. Ottawa: National Library of Canada, 2000.

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Nikfarman, Hanieh. Determination of thermal conductivity of recovery boiler char bed materials. Ottawa: National Library of Canada, 2001.

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Martinez, Mark. Enhanced removal of kraft recovery boiler fireside deposits by thermal shock. Ottawa: National Library of Canada, 1990.

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Kuznecov, Vyacheslav, and Oleg Bryuhanov. Gasified boiler units. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1003548.

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The textbook gives the basic concepts of gasified heat generating (boiler) installations and the terminology used in boiler technology, the principle of operation and device of gasified heat generating (boiler) installations. The types and device of heat generators (boilers) of their furnace devices are considered; types and device of gas-burning devices, the number and places of their installation in furnace devices; auxiliary equipment-devices for air supply and removal of combustion products, devices for water treatment, steam supply and circulation of the coolant of hot water boilers; device for thermal control and automatic regulation of the boiler installation. The issues of operation and efficiency of gasified heat generating (boiler) installations and their gas supply systems; requirements for conducting gas-hazardous and emergency recovery operations of gas supply systems are considered. Meets the requirements of the federal state educational standards of secondary vocational education of the latest generation. For students of secondary vocational education in the specialty 08.02.08 "Installation and operation of equipment and gas supply systems".
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Cramer, K. Elliott. Thermal nondestructive characterization of corrosion in boiler tubes by application of a moving line heat source. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 2000.

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Paterson, Duncan. Flash Computation and EoS Modelling for Compositional Thermal Simulation of Flow in Porous Media. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11787-0.

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Tatum, Kenneth E. Computation of thermally perfect properties of oblique shock waves. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1996.

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India. Central Board of Irrigation and Power. Research Scheme on Power., ed. Investigation on boiler tube failures in thermal power stations: Project report. New Delhi: Research Scheme on Power, Central Board of Irrigation and Power, 1988.

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Kudinov, Anatoliy, and Svetlana Ziganshina. Energy saving in boiler thermal power plants and systems of heat supply. Infra-M Academic Publishing House, 2015. http://dx.doi.org/10.12737/11565.

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Book chapters on the topic "Thermal computation of boiler"

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Bella, O., C. Cortés, and A. Tomás. "Application of Neural Networks for local modeliation of the boiler furnace in thermal power plants." In Biological and Artificial Computation: From Neuroscience to Technology, 1270–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/bfb0032587.

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Singh, Pradeep Kumar, Rishabh Chaturvedi, and Manoj Kumar. "Examination and Analysis of Thermal Steam Boiler Using Power Plants." In Computational and Experimental Methods in Mechanical Engineering, 459–67. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2857-3_45.

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O’Kelly, Peter. "Boiler Circuits and Steam Generation." In Computer Simulation of Thermal Plant Operations, 301–35. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4256-1_12.

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El Hefni, Baligh, and Daniel Bouskela. "Boiler (Steam Generator) Modeling." In Modeling and Simulation of Thermal Power Plants with ThermoSysPro, 153–64. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05105-1_7.

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Liu, Xingrang, and Ramesh Bansal. "Internet-Supported Coal-Fired Power Plant Boiler Combustion Optimization Platform." In Thermal Power Plants, 275–84. Boca Raton : Taylor & Francis, CRC Press, 2016.: CRC Press, 2016. http://dx.doi.org/10.1201/9781315371467-15.

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Bryan, Kurt. "An inverse Problem in Thermal Imaging." In Computation and Control III, 73–82. Boston, MA: Birkhäuser Boston, 1993. http://dx.doi.org/10.1007/978-1-4612-0321-6_5.

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Prashar, Gaurav, Hitesh Vasudev, and Lalit Thakur. "A Case Study on the Failure Analysis, Prevention, and Control of Boiler Tubes at Elevated Temperatures." In Thermal Spray Coatings, 347–52. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003213185-15.

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Bijli, Muhamed Muzaiyen S. M., T. Paneerselvam, K. Alahiyanambi, and M. A. Jafar Basha. "Optimization of Boiler Efficiency at Mettur Thermal Power Station." In Proceedings of the International Conference on Soft Computing Systems, 581–92. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2671-0_56.

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Law, Victor J., and Denis P. Dowling. "Active Control Metrology for Preventing Induced Thermal Damage During Atmospheric Pressure Plasma Processing of Thermal Sensitive Materials." In Emergence, Complexity and Computation, 321–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-45438-7_32.

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Jin, Yingai, Cong Tian, Yaohong Xing, Mingyu Quan, Jiwei Cheng, Yuying Yan, and Jiatong Guo. "The Effect of Air Distribution Modes and Load Operations on Boiler Combustion." In Advances in Heat Transfer and Thermal Engineering, 827–31. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4765-6_140.

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Conference papers on the topic "Thermal computation of boiler"

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Kim, Tae-Woan, Jae-Cheol Kim, and Suk-Hwan Hwang. "Structural Analysis of Utility Boiler Waterwall." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79431.

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The safe structural design of boiler waterwalls with various loadings such as dead weight, fluid pressure, gas pressure and thermal differences is an extensive problem demanding the use of sophisticated computation methods due to the complexity of the geometric structure and the large size of the walls. To evaluate the operating reliability of boiler waterwalls, it is essential to know not only overall behavior of the whole structure but also the stress states at the critical zones. In this paper, the structural soundness for the Korea standard 500MW boiler waterwalls is preliminary examined. The equivalent orthotropic plate model is used to investigate the structural behavior of boiler waterwalls under thermal differences. Submodeling technique for part model of boiler waterwalls is proposed to accurately compute stresses of waterwalls at the critical zones under gas pressure. The computed stresses are combined and finally compared with the allowable stress limits according to the criteria of ASME Code.
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Tang, Guangwu, Bin Wu, and Chenn Q. Zhou. "Numerical Simulation and Optimization of a Carbon Monoxide Boiler." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7281.

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Carbon monoxide (CO) boilers play an important role in the petroleum refining industry, completing the combustion of CO in the flue gas generated by the regeneration of fluidized cracking catalyst. The heat released by the CO combustion is used to generate steam for use in the refinery. The flue gas flow path can have a significant effect on the thermal efficiency and operation safety of the boiler. In this paper, a CO boiler which had been experiencing low thermal efficiency and high operation risks was studied. A three-dimensional (3D) computational fluid dynamics (CFD) model was developed with detailed description on the combustion process, flow characteristics and heat transfer. The results obtained from the model have good agreement with the plant measurement data. The heat transfer between the tubes and the combustion flue gas was optimized by adding a checker wall.
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Nilsson, T. K., T. Klason, X. S. Bai, and B. Sunde´n. "Thermal Radiation Heat Transfer and Biomass Combustion in a Large-Scale Fixed Bed Boiler." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42249.

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The main focus of this work is to investigate the performance of some simple radiation models used in the thermal radiative heat transfer calculations in a 55 MWe fixed bed boiler with wet wood-chips as the fuel. An optically thin approach, Rosseland approximation, and the P1-approximation were utilised in the investigation. A new optimised version, as it comes to computational speed, of the exponential wide band model (EWBM) is used. The initial calculations showed that the optically thick approach failed. The optically thin approach actually gave the best prediction of the temperature, if the mean beam length (Lm) was chosen carefully. The P1-approximation gave less good predictions than the best optical thin case, but it could be the best engineering model to use if little was known about the mean beam length. The conclusion is that the optically thin model is sensitive to the chosen mean beam length (Lm) used in the EWBM. The P1-approximation is almost insensitive to the choice of Lm, due to the consideration of radiation self-absorption, where the different predicted values of the incident radiation compensate for different values of Lm. For the same reason, the use of other solution techniques, such as DOM or DTM, may lead to the same conclusion, i.e., the insensitivity of the choice of Lm.
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Bar-Ziv, E., Y. Berman, R. Saveliev, M. Perelman, E. Korytnyi, B. Davidson, and B. Chudnovsky. "Fouling Formation in 575 MW Tangential-Fired Pulverized-Coal Boiler." In ASME 2009 Power Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/power2009-81035.

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Over the past years we have gained experience in employing varying types of coal fired in the same boiler. Consequently, we developed evaluation criteria regarding the operation of these coals. In the present study we evaluated fouling propensity of two bituminous South African coals Billiton-Prime and Anglo-Kromdraai (AKD). From an experimental work carried out in a 50 kW test facility where we obtained emissivity and thermal resistance of the two coal ashes. We also developed a new method for evaluating fouling in full-scale utility boilers that is based on adhering of an ash particle depending on its temperature and velocity vector at the boundary layer of the water-walls. The flow and temperature fields were determined by computational fluid dynamic (CFD) simulations. We used the emissivity and thermal resistance determined from the test furnace in the CFD calculations to evaluate fouling in the combustion chamber of a 575 MW tangential-fired utility boiler when the two bituminous coals were fired. Mapping of the fouling locations that are mostly to occur were determined and this behavior fit the experience from the power station and data obtained for these two coals.
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Pattinson, Alec, James Dodds, Peter Hugill, and Gary Reed. "Finite Element Analysis of a Pipe Junction With a Thermal Sleeve Subject to Thermal and Pressure Transient Events." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28125.

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This paper describes the results of a Finite Element Analysis (FEA) of a pipe junction consisting of a thermal sleeve subject to rapid temperature changes. The purpose of the analysis was to utilise derived Computational Fluid Dynamic (CFD) temperatures to calculate stresses on the pressure boundary and thermal sleeve of a pipe junction. Several transient events were modelled and analysed. Work was then carried out in accordance with the relevant articles of the ASME Boiler and Pressure Vessel Code, Section III, sub-section NB. Work included, design, hydrotest, Level A (including fatigue) and simplified elastic plastic assessments, however not presented within this paper. The likely fracture performance of the pressure boundary was also investigated, however are also not presented within this paper.
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Frank, Alex, Marco J. Castaldi, and Masato R. Nakamura. "Numerical Modeling of Pollution Formation in Waste-to-Energy Systems Using Computational Fluid Dynamics." In 19th Annual North American Waste-to-Energy Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/nawtec19-5450.

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This investigation has been undertaken to better understand pollutant formation in Waste-to-Energy (WTE) systems by using Computation Fluid Dynamics (CFD). An above-grate gas phase only model was built and calculated in FLUENT™ with the intent of specifically studying the factors that influence the formation of NOx. Results are shown for a typical reciprocating-grate WTE boiler operating on municipal solid waste (MSW). Contours of velocity, temperature, CO2, CO, H2O, and O2 agree well with previous modeling and data resulting in a high fidelity model that can be implemented in the next phase of this research. Preliminary data is shown for thermal NOx and the results are promising. The next phase of this research will include the development and implementation of detailed kinetic mechanisms (DKM) to model NOx formation with the current boiler presented as well as others with varying fuels.
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Loughrin, Casey, Hyunjae Park, and Robert Weber. "Development of Analysis Algorithm and Computational Methodology for the Evaluation of Non-Uniform Energy Conversion System Performance: Part I — Component Analysis Modules." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14960.

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This paper examines the development of the individual component analysis modules applied to two selected energy conversion systems; a vapor-compression refrigeration system and a boiler heating system. The energy conversion components used in this work are the evaporator, condenser, expansion valve, mixing chamber, open feedwater heater, pipe, boiler, pump, and compressor. The developed component analysis modules are able to apply input data and specifications to estimate the corresponding thermal performance of the component. Upon investigation of the two case studies presented, it was found that the two-phase heat exchanging components such as the evaporator, condenser and boiler were the primary sources of the non-uniform system performance characteristics. As a consequence, a system connectivity matrix has been developed to evaluate the mass and energy flow characteristics of working fluids between components. The developed component analysis modules, in conjunction with the system connectivity matrix, were exclusively used to calculate the local and overall system thermal performance.
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Bar-Ziv, Ezra, Efim Korytnyi, Miron Perelman, Roman Saveliev, and Boris Chudnovsky. "Prediction of Fouling and Slagging in Pulverized-Coal Fired Furnaces." In ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98045.

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The objective of this paper is to develop a method for predicting the fouling dynamics and thermal resistance of a certain coal and its fly ash in a coal-fired utility boiler as well as determine the emissivity of the fly ash in order to optimize soomblowing procedures for fouling clean-up. The methodology comprises combustion experiment in a 50kW test facility, characterization of the coal and its mineral matter and the consequent fly ash as well a series of computational fluid dynamic simulations. Ash deposition from Cerrejon D Colombian and Billiton-Prime South African coals were studied and their behavior predicted in 575MW tangentially-fired and 550MW opposite-wall boilers. Good comparison was obtained between predicted results and actual data from the boilers.
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Al-Habahbeh, O. M., D. K. Aidun, P. Marzocca, and H. Lee. "Integrated Physics-Based Approach for the Reliability Prediction of Thermal Systems." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-13342.

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A broad reliability prediction method that can deal with complex thermo-fluidic systems is introduced. The procedure provides an engineering tool by integrating multiple computational packages to enable the simulation of a wide array of systems, especially those involving physics interactions such as fluid flow and solid medium. Computational Fluid Dynamics (CFD), Finite Element Method (FEM), Monte Carlo Simulation (MCS), and Fatigue analysis tools are integrated within this approach. CFD simulation is used to determine the heat convection terms used for the transient FEM analysis. Maximum thermal stress is provided by the FEM analysis whereby the fatigue life of the component is evaluated. Due to uncertainty of input parameters, the fatigue life will be in a Probability Density Function (PDF) form, which provides the relationship between the reliability and the service life of the system. The complete procedure is demonstrated using a cylindrical ring model, and then validated using experimental data gathered for power plant boiler pipes. The results show good agreement between the two methods.
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Nguyen, Q. H., W. Zhou, G. Xu, L. W. Swanson, and D. K. Moyeda. "Comprehensive Modeling Study on Fuel Gas Reburn in an Opposed Wall Fired Boiler." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42313.

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GE conducted engineering and modeling studies to evaluate the feasibility of applying gas reburn technology on Eskom’s Majuba Unit 5 (710 MWe). The key objective of the study was to evaluate the technical and economical feasibility of utilizing a low-calorific fuel gas as a reburn fuel. The fuel gas is produced from an underground gasification process of the Majuba coal deposits, which are difficult to mine. The studies include: (1) develop a conceptual gas reburn injection system that will serve as a basis for the boiler performance impact and economic studies, (2) evaluate mixing performance of the gas reburn system and evaluate impacts of gas reburn on the furnace thermal and species profiles using computational fluid dynamics (CFD) modeling, (3) evaluate impacts of gas reburn on the boiler thermal performance using heat transfer modeling, (4) evaluate NOx reduction potential of the gas reburn systems, and (5) evaluate the economical feasibility of applying gas reburn technology to the Majuba boiler. The study indicates that the proposed reburn fuel and OFA injection systems will provide adequate mixing and reasonable residence time for the reburn application. The potential impacts on boiler performance with injection of the low-calorific fuel gas include the flue gas flow rate, attemperation rate and ID fan capacity. The detailed modeling approach and results are presented in this paper.
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Reports on the topic "Thermal computation of boiler"

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Caruso, A., I. Flour, O. Simonin, and C. Cherbonnel. Detailed thermal-hydraulic computation into a containment building. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/107791.

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Butcher, Thomas. Effect of Thermal Storage on the Performance of a Wood Pellet-fired Residential Boiler. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1426787.

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BUTCHER, T. A. HYDRONIC BASEBOARD THERMAL DISTRIBUTION SYSTEM WITH OUTDOOR RESET CONTROL TO ENABLE THE USE OF A CONDENSING BOILER. Office of Scientific and Technical Information (OSTI), October 2004. http://dx.doi.org/10.2172/15010018.

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Viecelli, J., D. Chambers, and T. Karr. Computation of small scale velocity turbulence and its effect on Optical scintillations and stimulated thermal Rayleigh scattering. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/7236848.

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Mondal, Kanchan, Rasit Koc, and Chinbay Fan. HVOF Thermal Spray TiC/TiB2 Coatings for AUSC Boiler/Turbine Components for Enhanced Corrosion Protection. Office of Scientific and Technical Information (OSTI), December 2016. http://dx.doi.org/10.2172/1334673.

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Feierl, Lukas, and Peter Luidolt. Automated monitoring, failure detection of key components, control strategies and self-learning controls of key components. IEA SHC Task 55, September 2020. http://dx.doi.org/10.18777/ieashc-task55-2020-0005.

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