某600 MW凝汽机组供热改造方案热经济性分析
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摘要
通过建立基于热平衡法的热力分析模型,对某600 MW凝汽式汽轮发电机组的抽汽供热改造方案进行了热经济性分析。计算了非供热工况、再热冷段抽汽供热工况、再热热段抽汽供热工况下机组的发电功率、热耗率、发电煤耗率等指标,并对比了不同供热工况、不同供热抽汽流量下机组的热性能。研究结果表明:该机组采用再热蒸汽供热,热经济性好,且在最大供热抽汽流量运行时发电煤耗率最低;相比于再热热段抽汽供热方案,再热冷段抽汽供热方案的发电功率和发电煤耗率较大。
By constructing a thermal analysis model based on heat balance method,the paper analyzes thermal economy of the extraction and heat supply reconstruction scheme for one 600 MW condensing steam turbine generator unit. It calculates indicators including generated power,thermal consumption rate,coal consumption rate and so on of the unit under different working conditions of non-heat-supply condition,low-temperature reheat steam tube extraction and heat supply,high-temperature reheat steam tube extraction and heat supply. Meanwhile,it compares thermal performance of the unit under different heat supply conditions and different heat supply and extraction flow. Research results indicate thermal economy of the unit is better as it adopts reheat steam for heat supply and coal consumption rate is the lowest as the unit is running with the maximum heat supply and extraction flow. Compared with generated power and coal consumption rate of the high-temperature reheat steam tube extraction and heat supply scheme,that of the low-temperature reheat steam tube extraction and heat supply scheme is larger.
By constructing a thermal analysis model based on heat balance method,the paper analyzes thermal economy of the extraction and heat supply reconstruction scheme for one 600 MW condensing steam turbine generator unit. It calculates indicators including generated power,thermal consumption rate,coal consumption rate and so on of the unit under different working conditions of non-heat-supply condition,low-temperature reheat steam tube extraction and heat supply,high-temperature reheat steam tube extraction and heat supply. Meanwhile,it compares thermal performance of the unit under different heat supply conditions and different heat supply and extraction flow. Research results indicate thermal economy of the unit is better as it adopts reheat steam for heat supply and coal consumption rate is the lowest as the unit is running with the maximum heat supply and extraction flow. Compared with generated power and coal consumption rate of the high-temperature reheat steam tube extraction and heat supply scheme,that of the low-temperature reheat steam tube extraction and heat supply scheme is larger.
引文
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[3]李慧君,王泽伟.机组基于能质系数法的会计模式热经济学节能分析[J].广东电力,2016,29(5):15-19.LI Huijun WANG Zew ei.Thermo-economics energy saving analysis for accounting mode for units based on energy quality coefficient method[J].Guangdong Electric Pow er,2016,29(5):15-19.
[4]谢亚军.供热燃机电厂凝结水系统配置研究[J].陕西电力,2013,41(6):87-90.XIE Yajun.Study on condensate system disposition of heat supply gas fired pow er plant[J].Shaanxi Electric Pow er,2013,41(6):87-90.
[5]任洪波,吴琼,杨秀,等.日本分布式热电联产系统发展动态及启示[J].中国电力,2015,48(7):108-114.REN Hongbo,WU Qiong,YANG Xiu,et al.Development of distributed cogeneration system in Japan and the revelation to China[J].Electric Pow er,2015,48(7):108-114.
[6]高峰,赵曙伟.高频电源电除尘的节能减排效应[J].广东电力,2015,28(7):36-39.GAO Feng,ZHAO Shuw ei.Effect of energy conservation and emission reduction of high-frequency pow er source electric precipitation[J].Guangdong Electric Pow er,2015,28(7):36-39.
[7]王春艳,李军.100 MW凝汽式汽轮机低真空供热改造[J].吉林电力,2017,45(2):51-54.WANG Chunyan,LI Jun.M odification of low vacuum heat supply for 100 M W condensing steam turbine[J].Jilin Electric Power,2017,45(2):51-54.
[8]沈峰,朱鹏达,谭锐.200 MW机组三缸三排汽凝汽式汽轮机供热改造研究[J].浙江电力,2017,36(3):51-54.SHEN Feng,ZHU Pengda,TAN Rui.Research on heat supply retrofit of triple-cylinder triple-exhaust condensing steam turbine of200 M W units[J].Zhejiang Electric Pow er,2017,36(3):51-54.
[9]陈国年,刘今,周强,等.凝汽机组改供热后对运行经济性的影响分析[J].江苏电机工程,2011,30(1):9-13.CHEN Guonian,LIU Jin,ZHOU Qiang,et al.Analysis on effects of the heating-retrofit on operation economic of the condensing turbine-generator unit[J].Jiangsu Electrical Engineering,2011,30(1):9-13.
[10]张瑞青,杨旭昊,王雷.不同抽汽工况下供热机组热经济性分析[J].热力透平,2011,40(1):70-72.ZHANG Ruiqing,YANG Xuhao,WANG Lei.Analysis on thermal efficiency indexes of heat supply unit under different extraction steam conditions[J].Thermal Turbine,2011,40(1):70-72.
[11]林万超.火电厂热力系统节能理论[M].西安:西安交通大学出版社,1994.
[12]郑体宽.热力发电厂[M].2版.北京:中国电力出版社,2008.