Energy Efficiency Assessment of Large Capacity Coal-fired Boiler Based on Exergy Analysis

doi:10.11930/j.issn.1004-9649.201812118

Abstract

Abstract: In order to study the efficiency in energy conversion and transformation process in coal-fired power generation, and to take advantage of the energy conservation potential, on the basis of the analysis and comparison of the heat balance and exergy balance, the intrinsic relationship between the heat loss and exergy loss is disclosed such that the breakdown of energy conservation potential in the entire process of coal-fired power generation were assessed. Accordingly, the approaches such as increasing the hot air temperature, using oxy combustion, decreasing the excess air coefficient and improving the steam conditions are investigated in depth to evaluate their effects on exergy losses in combustion process, steam heat transfer, air preheating heat transfer, and so on. It is found out that, increasing the hot air temperature, application of oxy combustion, improving the steam temperature and pressure could reduce the net coal consumption by 6~ 9, 6 ~ 10, 11, and 5 ~ 12 g/(kW·h) respectively. These conclusions could provide the guidance for the direction of further development of energy conservation technologies in coal-fired power industry.

Key words: coal-fired boiler, energy conservation, exergy, multistage preheating, oxy combustion, high parameters

WANG Weiliang, WANG Yuzhao, LYU Junfu, SHAO Wenjun, CHI Zhongjun, ZHANG Ji. Energy Efficiency Assessment of Large Capacity Coal-fired Boiler Based on Exergy Analysis[J]. Electric Power, 2020, 53(4): 177-185.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201812118

https://www.electricpower.com.cn/EN/Y2020/V53/I4/177

References

[1] BP Company. Energy demand by fuel[EB/OL]. (2018-10-20)[2018-12-01]. https://www.bp.com/en/global/corporate/energy-economics/energy-outlook/demand-by-fuel.html.
[2] IEA. Electricity Statistics[EB/OL]. (2017-12-30)[2018-12-01]. http://www.iea.org/statistics/electricity/.
[3] 中华人民共和国国家统计局. 中国统计年鉴2016[M]. 北京: 中国统计出版社, 2017.
[4] 中国电力企业联合会. 中国电力行业年度发展报告(2018)[R]. 北京, 2018.
[5] 冯俊凯, 沈幼庭, 杨瑞昌. 锅炉原理及计算[M]. 北京: 科学出版社, 2003.
[6] 冯俊凯, 岳光溪, 吕俊复. 循环流化床燃烧锅炉[M]. 北京: 电力工业出版社, 2003.
[7] TILLMAN D A. Coal-fired power plants[M]//Coal-Fired Electricity and Emissions Control. Elsevier, 2018: 207-236. DOI: 10.1016/b978-0-12-809245-3.00008-2
[8] 朱明善. (?)与能的合理利用[J]. 能源, 1983(1): 32–35
[9] 项新耀. (?)(Ex)概念及(?)值的计算[J]. 油田地面工程, 1985, 4(1): 27–35
XIANG Xinyao. The concept of exergy and its evaluation[J]. Oilfield Surface Engineerging, 1985, 4(1): 27–35
[10] 项新耀. 化学(?)的计算[J]. 油田地面工程, 1985, 4(6): 31–37
XIANG Xinyao. Combustion on chemical exergy[J]. Oilfield Surface Engineerging, 1985, 4(6): 31–37
[11] 李金玉. 电站锅炉?平衡计算分析[J]. 西安交通大学学报, 1986, 20(2): 87–97
LI Jinyu. Exergy balance calculations for a power plant boiler[J]. Journal of Xi'an Jiaotong University, 1986, 20(2): 87–97
[12] 陈莉. 电站锅炉的热力计算与(?)分析应用程序[D]. 哈尔滨: 哈尔滨工程大学, 2004.
CHEN Li. Applied program of boiler in power plant on thermaodynamic calculation and exergy analysis[D]. Harbin: Harbin Engineering University, 2004.
[13] SENGUPTA S, DATTA A, DUTTAGUPTA S. Exergy analysis of a coal-based 210 MW thermal power plant[J]. International Journal of Energy Research, 2007, 31(1): 14–28.
[14] 王雨丝, 夏家群, 和浩浩, 等. 600MW超临界火力发电机组锅炉效率分析[J]. 工业加热, 2016, 45(1): 5–8, 25
WANG Yusi, XIA Jiaqun, HE Haohao, et al. Efficiency analysis of boiler of 600mw supercritical thermal power generator set[J]. Industrial Heating, 2016, 45(1): 5–8, 25
[15] 刘强, 段远源. 超临界600 MW火电机组热力系统的?分析[J]. 中国电机工程学报, 2010, 30(32): 8–12
LIU Qiang, DUAN Yuanyuan. Exergy analysis for thermal power system of a 600 MW supercritical power unit[J]. Proceedings of the CSEE, 2010, 30(32): 8–12
[16] YANG Y P, WANG L G, DONG C Q, et al. Comprehensive exergy-based evaluation and parametric study of a coal-fired ultra-supercritical power plant[J]. Applied Energy, 2013, 112: 1087–1099.
[17] ZHU Y, ZHAI R R, PENG H, et al. Exergy destruction analysis of solar tower aided coal-fired power generation system using exergy and advanced exergetic methods[J]. Applied Thermal Engineering, 2016, 108: 339–346.
[18] ADIBHATLA S, KAUSHIK S C. Energy, exergy and economic (3E) analysis of integrated solar direct steam generation combined cycle power plant[J]. Sustainable Energy Technologies and Assessments, 2017, 20: 88–97.
[19] NAMI H, AKRAMI E. Analysis of a gas turbine based hybrid system by utilizing energy, exergy and exergoeconomic methodologies for steam, power and hydrogen production[J]. Energy Conversion and Management, 2017, 143: 326–337.
[20] 韩小渠, 刘明, 严俊杰, 等. 基于风扇磨仓储式制粉系统的褐煤烟气预干燥发电系统分析及优化研究[J]. 动力工程学报, 2017, 37(2): 148–155
HAN Xiaoqu, LIU Ming, YAN Junjie, et al. Exergy analysis and system optimization of a flue gas pre-dried lignite-fired power system based on fan mill dryer and open pulverizing system[J]. Journal of Chinese Society of Power Engineering, 2017, 37(2): 148–155
[21] GURTURK M, OZTOP H F. Exergy analysis of a circulating fluidized bed boiler cogeneration power plant[J]. Energy Conversion and Management, 2016, 120: 346–357.
[22] TUMEN OZDIL N F, TANTEKIN A, ERBAY Z. Energy and exergy analyses of a fluidized bed coal combustor steam plant in textile industry[J]. Fuel, 2016, 183: 441–448.
[23] SEMKOV K, MOONEY E, CONNOLLY M, et al. Efficiency improvement through waste heat reduction[J]. Applied Thermal Engineering, 2014, 70(1): 716–722.
[24] COMPTON M, REZAIE B. Enviro-exergy sustainability analysis of boiler evolution in district energy system[J]. Energy, 2017, 119: 257–265.
[25] DARVISH K, EHYAEI M, ATABI F, et al. Selection of optimum working fluid for organic Rankine cycles by exergy and exergy-economic analyses[J]. Sustainability, 2015, 7(11): 15362–15383.
[26] ZHAO C H, ZHENG S Y, ZHANG J, et al. Exergy and economic analysis of organic Rankine cycle hybrid system utilizing biogas and solar energy in rural area of China[J]. International Journal of Green Energy, 2017, 14(14): 1221–1229.
[27] JIN B, ZHAO H B, ZHENG C G. Dynamic exergy method and its application for CO₂ compression and purification unit in oxy-combustion power plants[J]. Chemical Engineering Science, 2016, 144: 336–345.
[28] UYSAL C, KURT H, KWAK H Y. Exergetic and thermoeconomic analyses of a coal-fired power plant[J]. International Journal of Thermal Sciences, 2017, 117: 106–120.
[29] SI N N, ZHAO Z G, SU S, et al. Exergy analysis of a 1000 MW double reheat ultra-supercritical power plant[J]. Energy Conversion and Management, 2017, 147: 155–165.
[30] 李永毅, 徐钢, 薛小军, 等. 燃煤电站一次风加热流程优化的高效集成系统性能分析[J]. 中国电机工程学报, 2017, 37(20): 5970–5979
LI Yongyi, XU Gang, XUE Xiaojun, et al. Performance analysis of the efficient integrated system of coal-fired power plant based on optimized primary air heating process[J]. Proceedings of the CSEE, 2017, 37(20): 5970–5979