Relevant bibliographies by topics / Thermic calculation of the boiler

Contents

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

Academic literature on the topic 'Thermic calculation of the boiler'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Thermic calculation 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 (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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Gao, Zheng Yang, Bo Wen Zhang, Rui Qing Xia, Wen Hui Feng, and Tian Long Wang. "Research on the Heat Transfer Characteristic of Boiler under Solar-Coal Complementary Electric Generation Condition." Advanced Materials Research 347-353 (October 2011): 836–42. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.836.

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Solar-coal complementary electric generation is a new way to utilize solar thermal, however, using solar thermal to replace the heat transfer of some heating surfaces will inevitably affects the stability and efficiency of boiler operation, and the running characteristics of the boiler will affects the utilization capacity of the solar thermal in turn. A 300MW unit thermal- circulation boiler has been studied. A research on calculation of heat transfer characteristic has been made. The influence of solar-energy utilization on heat transfer has been analyzed. Calculation and analysis indicate that using solar thermal to heat the feedwater can decrease coal consumption. 87.2% of the coal consumption decrement can be attributed to the replacement of coal by solar thermal, 12.8% of the coal consumption decrement is leaded by the boiler efficiency increment; Solar thermal should not be introduced into the boilers with low exhaust gas temperature and the boilers running at low load operation; Using solar thermal to heat the feedwater leads to decreasing spray water; Through the boiler calculation in this paper, the maximum solar thermal utilization capacity is 19.27MW.
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Li, Po, and Cheng Wei Zhang. "The Analysis between Two Different Methods of Power Plant Boiler Thermal Efficiency." Applied Mechanics and Materials 536-537 (April 2014): 1578–82. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1578.

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The power plant boiler is one of the most important facilities in thermal power plants. The thermal efficiency of power plant boilers is the index. This paper discusses the relationship between the boiler thermal efficiency and the coefficient of excess air via two methods, one is called the simplified calculating formula and the other is the calculating formula according to the The People's Republic of China national standard power plant boiler performance test procedures. According to the proposed methods, by solving the same optimal problem, optimum excess air coefficients are obtained. Then a comparative analysis is given. Moreover, an improved way for saving calculation time to get the coefficients of the mixed coal in the so called simplified calculating formula is developed.
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Liao, Hong Kai, Yue Xi Yu, Yan Ling Wu, and Wei Zhong. "Model and Algorithm for Thermal Performance Calculation of Power Station Boiler Based on Process Steady-State Simulation Theory." Applied Mechanics and Materials 483 (December 2013): 587–93. http://dx.doi.org/10.4028/www.scientific.net/amm.483.587.

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Thermal performance calculation is the core task of designing power station boiler. By abstracting generalized components and generalized fluid nodes, and defining the process unit and process section at the logic level, the universal physical model of boiler was built in a particular form of flowsheet. Meanwhile, a sequential modular approach was proposed as the main algorithm for boiler thermal calculation based on process system steady-state simulation theory. Two key problems in the algorithm, i.e., module calculations and the logics of calling the modules calculations were explained. Finally, a practically developed system BESS, which has excellent flexibility and extensibility was presented. It turns out that the model and algorithm can be successfully employed in developing the general-purpose software for boiler thermal calculation.
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Shelygin, B. L., S. A. Pankov, and G. V. Ledukhovsky. "Development of simplified mathematical model of P-88 recovery boiler for operating modes at loads near the nominal." Vestnik IGEU, no. 1 (February 28, 2021): 5–13. http://dx.doi.org/10.17588/2072-2672.2021.1.005-013.

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To improve the design of the elements of combined-cycle plants, and their structural and mode optimization, mathematical models are required. These models show energy efficiency indicators of the equipment under changing operating conditions. Modeling of recovery boilers is traditionally carried out with the application of specialized software systems that implement submodels of thermal-hydraulic calculations of the elements of the boiler water-steam and gas paths. This approach makes it difficult to solve practical tasks, since it requires licensed software and appropriate qualifications of an engineer. The current direction of solving this problem is statistical processing of the results of calculation data obtained with the application of specialized software systems, and development of a simplified mathematical model in the form of regression dependencies of boiler performance on variable parameters. In this study, the problem is solved in relation to the P-88 boiler of the combined-cycle plant-325 power unit in the load range near the nominal one. The initial mathematical model is developed with the application of the software package “TRAKT” designed for verification and engineering design of boilers. The simplified mathematical model is based on the methods of regression analysis of statistical data. The accuracy of the model is estimated based on the operational data of the combined-cycle plant -325 power unit. The authors have developed the mathematical model of the P-88 recovery boiler, which allows to determine the main performance indicators of the boiler when the electric power of the gas turbine and the outdoor air temperature are changing at the loads near the nominal value. The performance indicators are determined without application of specialized software for design calculation of the boiler. The accuracy of the initial mathematical model implemented in the software package “TRACT” is characterized by deviation of the calculation results data from the operational data in the corresponding modes of no more than 2 %. The additional uncertainty value introduced into the calculation results data does not exceed 1,5 % when we transfer from the initial mathematical model to the simplified one. The resulting mathematical description will allow solving the problems of mode optimization and evaluating the efficiency of the recovery boiler and the power unit under changing operating conditions.
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Sheng, Ji Sheng, Biao Bing Wang, and Wen Jian Li. "A Study on Structural Characteristics of Biomass Briquette Boiler." Applied Mechanics and Materials 197 (September 2012): 211–15. http://dx.doi.org/10.4028/www.scientific.net/amm.197.211.

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According to the experimental analysis on characteristics and combustion law of the biomass briquette, it designs the biomass briquette boiler based on the detailed thermodynamic calculation to promote the boiler’s combustion and thermal efficiency. The boiler adopts the chain grate stoker which strengthens the combustion intensity of the hearth. The longer the hearth becomes, the more intense the combustion of the biomass briquette is, so that the biomass briquette boiler of thermo performance design has helped realize such goals.
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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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Elmaryami, Asa, Abdulla Sousi, Walid Saleh, Sharefa El-Mabrouk Abd El-Mawla, and Mohamed Elshayb. "MAXIMUM ALLOWABLE THERMAL STRESSES CALCULATION OF WATER TUBE BOILER DURING OPERATION." International Journal of Research -GRANTHAALAYAH 7, no. 7 (2019): 191–99. http://dx.doi.org/10.29121/granthaalayah.v7.i7.2019.747.

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In steam boiler industrial sector, pressure and temperature of the water tube are the two main factors that affecting the safety and efficiency of a steam boiler. Explosions may be occurring because of a sudden drop in pressure without a corresponding drop in temperature. Therefore, understanding the temperature distribution of the water tube boiler is essential control the failure and explosion of the boiler. Once the temperature distribution is known then the limiting factors that affect the water tube life such as maximum allowable thermal stresses can be determined. ANSYS software will be used to determine the temperature distribution in the water tube of a utility boiler during operation at elevated inlet water and furnace temperature. The theory of axisymmetric has been utilized since water- tube is cylindrical in shape. In axisymmetric theory, a three-dimensional cylindrical problem like water tube can be reduced to two dimensional by ignoring the circumferential Ө, while r-axis and z-axis became x-axis and y-axis or Cartesian coordinate. Then two-dimensional rectangular elements meshing for the profile cross-section along the water tube in r and z axes were implemented in a computerize simulation using ANSYS 10 to find out the steady state temperature distribution of the water tube.
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Chai, Jianwei, Xingfang Li, and Meiling Yang. "Development and application of thermal calculation software for boiler furnace." Thermal Science 25, no. 4 Part B (2021): 3191–97. http://dx.doi.org/10.2298/tsci2104191c.

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Aiming at the thermal calculation of supercritical boiler furnace check, the article is based on the divisional calculation method in the thermal calculation standard of the Soviet Union in 1973, combined with the 1-D block flow model of pulverized coal combustion, and proposes a new divisional 1-D furnace exchange thermal calculation model, and compiled the corresponding thermal calculation software. The software is easy to use, not only can obtain the average temperature distribution of flue gas along the height of the furnace and the heat load of the section water wall, but also the carbon content of fly ash. The article takes a 600 MW supercritical boiler as an example and uses software to calculate the heat transfer in the furnace.
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Chen, Yiwei, Guanliang Ding, and Yakai Bai. "Simplified logistics model and its application in process simulation." Thermal Science, no. 00 (2020): 320. http://dx.doi.org/10.2298/tsci200626320c.

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In order to solve the problem of complex calculation of logistics value in process simulation, based on the parameter characteristics of Aspen Plus, a simplified logistics calculation model is proposed. The comparison with exercom shows that the error of the calculation results in this paper is less than 1%, which verifies the correctness of the model. The calculation model of logistics flow provides convenience for process simulation software Aspen Plus to analyze the simulation process. Based on the logistics calculation model and the "fuel cost" model of thermal economics, a coal-fired boiler of a domestic unit is analyzed. The results show that the heat loss of the boiler mainly occurs in the process of coal decomposition and combustion, followed by the heat exchange process between flue gas and main heat exchange surface. The overall efficiency of the boiler is 46.4%.
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Dissertations / Theses on the topic "Thermic calculation of the boiler"

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Haška, Miroslav. "Přepočet kotle při změně jmenovitých parametrů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228707.

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This thesis concerns with recalculation of steam boiler. Arrangement for reaching of new steam boiler parameters and temperature of combustion gases was suggested at first. Then it was verified with thermal calculation, all necessities included.
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Zajíc, Josef. "Plynofikace uhelného kotle 210 t/h; 13,63 MPa; 540 °C." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230871.

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This thesis aims to gas installation of the coal boiler and its thermal recount. In the first part, there is implemented calculation of the combusting chamber. After that follows the recalculation of heat exchange surfaces and proposal tube air heater, which will replace the existing air heater Ljungström. The emphasis is placed on the preservation of the exsiting steam parametrs and keeps emission limit of NOx.
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Štukavec, Karel. "Plynofikace olejového kotle v cukrovaru 65 t/h, 3,8 MPa, 450 °C." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231817.

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This masters thesis deals with the gasification of current oil boiler. The first part of the thesis describes the existing boiler. The next part follows gasification with respect for comply with the limits of NOX and recalculation of boiler for operation with the natural gas.
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Hradil, Lukáš. "Posouzení kotle na odpadní teplo." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228700.

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This theses work is concerned with assessment of transfer line exchanger behind pusher furnace. First part is describing technical characteristic and parametres. The most important part of this theses is thermic calculation of the boiler. Last following part is concerned with suggestions of constructional modifications of heating surface for proper functioning of boiler. These modifications are demonstrated by scheme in the enclosure.
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Přikryl, Josef. "Změna palivové základny uhelného kotle." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417841.

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The diploma thesis contains calculations of gasification of coal boiler. The first part of thesis contains stochiometric calculations, heat balance and calculations of combustion chamber. In the next part are calculations of heat exchange surfaces and at the end of this part are calculations of regenerative air heater and total boiler balance. Calculations are made by regard to investments costs, preservation of the steam parameters and keeps emissons limits.
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Vojtek, Marek. "Návrh termolejového kotle spalujícího dřevní štěpku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241703.

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This master´s thesis is dealing with thermal-oil boiler fired with wood chips. In the first part is the conception of the boiler, created on the base of the search of thermal-oil boilers producers and defined fuel. In the next section is the heat-transfer, aerodynamic and hydraulic calculation. In the last part is the design of the boiler technologies. In the appendix is the projection drawing which includes all important information for the construction draft.
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Pecháček, Michal. "Parní kotel na dřevní štěpku 25t/h, 5,5MPa, 475°C." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230874.

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The work deals with design of steam grate boiler with a output of 25 t/h, parameters of steam output p = 5.5 MPa, t = 475 °C and a temperature of feed water 105 °C. It is a boiler with natural water circulation by evaporation surfaces. Wood biomass is boiler fuel. The proposal consists of stoichiometric calculations, determination of boiler efficiency, thermal calculations and determinion geometric parameters of the boiler and its heat transfer surfaces. The boiler drawing is a part of the work.
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Mik, Martin. "Plynofikace horkovodního kotle." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232167.

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This thesis deals with the fuel change for hot water boilers with wattage of 116.3 MW. At first a stoichiometric calculation is drawn. Calculation of pressure loss in pipeline follows. Consequential part elaborates on calculation of parallel connected heating surfaces following with a draft of regenerative air heater Ljungtröm. Conclusively, a calculation is carried out to verify the functionality of the serial connection of the heating surfaces.
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Jež, Dalibor. "Využití odpadního tepla kogenerační jednotky pro výrobu technologické páry a vytápění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232150.

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This master’s thesis deals with design of technological system for heating and process steam generation. The source of energy is a cogeneration unit. The thesis is divided into several parts. The first part is design of technological system and description. The second part is realized stoichiometric calculation and the thermal balance of steam boiler. The main part of thesis is design of the waste heat steam boiler. The thermal calculation, aerodynamic calculation, hydraulic calculation and strength calculation were made. The thesis also includes the drawing of designed waste heat steam boiler.
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Kuriál, Jakub. "Návrh parního plynového kotle." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417512.

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This thesis deals with a design of a steam boiler combusting natural gas. It consists of stoichiometric calculation, determination of boiler efficiency, thermal calculations and determining geometric parameters of the boiler and its heat transfer surfaces. The results are verified by the heat balance of the boiler.
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Books on the topic "Thermic calculation of the boiler"

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Wolfgang, Wagner. International steam tables: Properties of water and steam based on the industrial formulation IAPWS-IF97 : tables, algorithms, diagrams, and CD-ROM electronic steam tables : all of the equations of IAPWS-IF97 including a complete set of supplementary backward equations for fast calculations of heat cycles, boilers, and steam turbines. 2nd ed. Springer, 2008.

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Book chapters on the topic "Thermic calculation of the boiler"

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Dong, Wei, Lingqiong Fu, Hongling Yu, Jianming Hui, Dong Fu, and Ruiyang Li. "Determination of the Characteristic Parameters on Thermal Calculation of CDQ Waste-heat Boiler." In Challenges of Power Engineering and Environment. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_118.

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Chen, Yanfei, and Donglin Chen. "An Algebraic Thermal Calculation Method and Its Application to Determine Heat-Insulating Refractory on Furnace Waterwall of a Pulverized-coal Fired Boiler." In Challenges of Power Engineering and Environment. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_37.

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Song, Wu Ru. "Wall Temperature Calculation of Drum for Large Capacity Boiler." In Challenges of Power Engineering and Environment. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_44.

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Rusiński, Eugeniusz, Artur Górski, Michał Attinger, Jerzy Czmochowski, and Michał Paduchowicz. "Selected Problems of Strength Calculation of Power Boiler Steam Superheater." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-04975-1_73.

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Li, Shaohua, Fang Xu, Donghui Song, Tingli Yu, Nan Zheng, and Lefei Xu. "BP Neural Network Combined with Thermodynamic Calculation Determining Boiler Optimal Operation Parameter Value." In Advances in Intelligent and Soft Computing. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25194-8_51.

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Li, Y., W. K. Li, Y. X. Wu, H. R. Yang, L. Nie, and S. S. Huo. "Numerical Calculation of Heat Transfer Distribution in a 600Mwe Supercritical Circulating Fluidized Bed Boiler." In Proceedings of the 20th International Conference on Fluidized Bed Combustion. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02682-9_121.

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Wang, Zhiwei, Jianhua Yang, and Qinghai Li. "Calculation and Analysis of Heat Transfer Coefficients in a Circulating Fluidized Bed Boiler Furnace." In Proceedings of the 20th International Conference on Fluidized Bed Combustion. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02682-9_21.

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Wang, Wen-huan, Wei-guo Pan, Jian-rong Sun, Jiang Wu, and Yun-long Zhou. "The Experimental and Calculation Studies on Steam Temperature Characteristics of Boiler Burning Pulverized Coal and BFG." In Challenges of Power Engineering and Environment. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_45.

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"Example of Thermal Calculation of 113.89 kg/s (410 t/h) Ultra-High-Pressure, Coal-Fired Boiler." In Theory and Calculation of Heat Transfer in Furnaces. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-12-800966-6.00016-8.

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Taplin, Harry. "Efficiency Calculation Methods." In Boiler Plant and Distribution System Optimization Manual, 3rd ed. River Publishers, 2021. http://dx.doi.org/10.1201/9781003151890-6.

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Conference papers on the topic "Thermic calculation of the boiler"

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Taler, Jan, Bohdan Węglowski, Tomasz Sobota, et al. "Thermal Performance and Stress Monitoring of Power Boiler." In ASME 2016 Power Conference collocated with the ASME 2016 10th International Conference on Energy Sustainability and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/power2016-59082.

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The paper presents a method for determination of thermo-flow parameters for steam boilers. This method allows to perform the calculations of the boiler furnace chamber and heat flow rates absorbed by superheater stages. These parameters are important for monitoring the performance of the power unit. Knowledge of these parameters allows determining the degree of the furnace chamber slagging. The calculation can be performed in online mode and use to monitoring of steam boiler. The presented method allows to the operation of steam boiler with high efficiency.
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Li, Yong, and Han Gao. "On-line Calculation for Thermal Efficiency of Boiler." In 2010 Asia-Pacific Power and Energy Engineering Conference. IEEE, 2010. http://dx.doi.org/10.1109/appeec.2010.5449383.

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Yang Jianmeng and Feng Xue. "Furnace thermal calculation of 300MW boiler by oxy-fuel combustion." In 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5988132.

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Zhang, Zhihong, Zhihua Zhou, and Qinghua Ren. "Thermal Calculation of Environmentally Friendly Gas-Fired Vacuum Hot Water Boiler." In 2008 2nd International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.323.

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Kim, Ha-Geun, Sang-Beom Shin, and Dae-Soon Kim. "Design on the Installation Position of Thermal Stress Monitoring System for CFBC Boiler of Thermal Power Plant." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-98080.

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The purpose of this study is to determine the installation position of thermal stress monitoring system through the lifetime calculation for fatigue and creep damage in CFBC (Circulating Fluidized Bed Coal) boiler with operating temperature of above 427°C. For it, the stress levels of the major pressure components in CFBC boiler were evaluated by Finite Element Analysis (FEA). With the results, the safety assessment based on the cumulative damage analysis was carried out in accordance with ASME NH code. According to FEA results, the maximum combined cumulative damages of 0.85 under the design loading conditions were found in the superheater outlet. However, total damages of the superheater outlet were below the critical value (1.0) specified by the creep-fatigue damage envelope of Cr-Mo material specified in ASME-NH code. From the results, the installation position of thermal stress monitoring system was determined as the superheater outlet for real time process calculations and securing structural safety of CFBC boiler.
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Ahnert, F., P. Colonna, and J. F. Kikstra. "Moving Boundary Model of Once Through Boiler Evaporators." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55583.

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Dynamic modeling and simulation of steam power plants is often adopted as a tool for control design, personnel training, efficiency improvement and on-line diagnostic. The boiler is possibly the most complex component of the thermal power plant. A usual boiler configuration is the so-called Once-Through arrangement. A common problem in 2-phase systems modeling is the correct calculation of the phase boundary. This is technically interesting in such boilers: the location of the phase transition changes rapidly depending on load conditions and temperature distribution along the walls. A lumped parameters, one-dimensional evaporator model implementing a moving boundary approach is presented and first validation results are discussed. The model takes into account the influence of radiation and convection on the gas side. The flow inside the pipes is divided into 3 regions (sub-cooled, 2-phase, superheated) and the model calculates the locations of the 2-phase transitions and the average steam quality along the pipes. The system is discretized using a staggered grid for higher numerical stability and is implemented in the computer program Aspen Custom Modeler (ACM). Results include the calculation of the system response to input signals simulating a load variation and a validation by comparison with a model implemented in a commercial software for power plant simulations (MMS). Input data, parameters and geometry are taken from an existing plant operating in Uppsala, Sweden.
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Yuanhao Shi, Jingcheng Wang, Bin Wang, and Yunfeng Zhang. "On-line calculation model for thermal efficiency of coal-fired utility boiler based on heating value identification." In 2011 International Conference on Modelling, Identification and Control. IEEE, 2011. http://dx.doi.org/10.1109/icmic.2011.5973701.

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Ha¨ggsta˚hl, Daniel, Catrin Bartusch, Erik Dahlquist, and Shilie Weng. "Simulation and Diagnostics of the External and Internal Circulation Flows of Solids in a Biomass Fired CFB Boiler." In ASME 2004 Power Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/power2004-52010.

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Ash related operational problems are very common in biomass fired boilers. Biomass naturally contains both sodium chloride and potassium chloride and theses compounds lower the melting temperature of the ash which may cause large operational problems with agglomeration and defluidization in Circulating Fluidized Bed (CFB) boilers. The number of biomass fired CFB-boilers for combined heat and power (CHP) production in the Scandinavian market is growing due to their good combustion efficiency, fuel flexibility and low emissions. The power companies are asking for a method to calculate the internal and external circulation flows of solids in the boiler and an accurate diagnostic method to detect initial agglomeration in order to be able to prevent the problem of defluidization that leads to large costs and loss of revenue when the boiler has to be shut down for cleaning. Two heat and mass balance based models have been developed in order to calculate the fuel flow and the internal and external solids circulation flows in a CFB boiler with internal heat exchangers (INTREX). The solids circulation model is divided into three parts: cyclone, combustion and INTREX chambers. Measurements used in the calculation are from commissioning tests on CFB-boiler 5 at Ma¨larEnergi in Va¨stera˚s, Sweden. The boiler was manufactured by Foster Wheeler OY in Finland and has a thermal heat output of 157 MW. The external solids flow at 100% load, with and without air humidification, is 215 kg/s and the internal solids circulation is 93 kg/s. The external solids circulation flow at 60% load is 30 kg/s and the internal solids circulation flow is 486 kg/s. At 60% load, there is no data available for validation, which means that this is more an estimate then a calculation. The calculated internal flow of solids is very sensitive to changes in the total heat flow in the INTREX chamber caused by agglomeration or combustion, whereas the external solids flow is not affected. Hence initial agglomeration and combustion can be detected. A simulated agglomeration in the INTREX chambers by decreasing the total heat flow by 1%, led to a decrease in the internal solids circulation flow by 11%. A simulation of combustion in the INTREX chamber of 0.5 kg/s of fuel entering the chamber corresponds to an increase in the total heat flow of 22% and a decrease in the calculated internal mass flow of 16%. The potential for using this method of diagnostics for detecting initial agglomeration is very promising.
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9

Hong, Junying, and Zhao Xu. "Research on Steam Generator False Water Level Calculation Improvement for PWR NPP Simulation Program." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81128.

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A U tube PWR NPP Steam Generator (SG) false water level phenomenon is researched in this paper. Lumped parameter method was employed to establish the SG thermo-hydraulic model. To simulate the false level phenomenon of SG, a fossil electricity generation plant boiler steam pocket model technique was applied by adding a non-linear equation into the original model. Furthermore, a set of static calculation and dynamic calculation in typical plant transient condition were done. And related preliminary validation was also carried out. It is indicated that the model established in this paper is able to simulate the false level phenomenon of SG with proper accuracy. And it will be helpful for future design and related analysis work.
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10

Brandstetter, Gottfried, and Christian Daublebsky. "Investigations on Dynamic Behaviour of Heat Recovery Steam Generators Carried Out With a Commercial Software Program." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27380.

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Heat recovery steam generators (HRSGs) downstream of gas turbines are often used in combination with process steam applications. A HRSG trip is more severe in applications with highly important process steam than in applications producing only electricity. HRSGs in important process steam applications can be equipped with a supplementary and fresh air firing system having the capacity of replacing at least the total waste heat coming from the gas turbine. A fresh air firing system provides the capability of keeping the HRSG in operation without the gas turbine running. If the HRSG is required to stay in operation even after a gas turbine trip, a change over from waste heat firing to fresh air firing has to follow immediately. The gas turbine speed rundown after a trip occurs very rapidly, so the change over procedure has to be carried out within a few seconds to avoid a HRSG shut down. Enormous gradients of heat input and steam mass flow extracted from the HRSG occur in such cases. This will cause the HRSG parameters to deviate considerably from the steady state, thus conventional HRSG calculations cannot be used in such cases. The thermal inertia of the HRSG needs to be considered, which requires the use of special software programs. A commercial boiler software program with a dynamic calculation module for unsteady calculations was utilized and a comparison with data gathered from the operation of the HRSG was performed. The boiler performance parameters during change over procedures were investigated in detail using extensive measurements at an Austrian steel mill (VOESTALPINE). The parameters of this investigation were compared with calculation results gained from a commercial software program for validation purposes. This comparison will enable predictions to be made for future projects with sufficient accuracy, which will allow the risk to be reduced when offering guarantees in this regard.
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