超超临界二次再热机组再热汽温低的分析与改进
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摘要
针对国内已投产超超临界二次再热机组锅炉普遍存在再热汽温低的问题,对已投产的泰州电厂二期SG-2710/33.03-M7050型二次再热锅炉进行过热蒸汽和一、二次再热蒸汽的吸热量计算和分析,表明再热气温低的原因是受热面比例设计存在偏差。提出了烟气再循环的改造方案,在75%热耗保证(THA)工况采用5%烟气再循环率时,一、二次再热汽温可以达到610℃以上,50%THA工况采用15%烟气再循环率一、二次再热气温也可以接近600℃。
Ultra-supercritical units with secondary reheat cycle have been being in China.The reheat steam temperature of is often lower than design value,especially under rated load operation.In this paper,the low reheat steam temperature of the Taizhou Power Plant is discussed as an example,in which the double reheat boiler type is SG-2710/33.03-M7050.By comparing and analyzing the thermal absorptions of superheated steam and primary reheat steam and secondary reheat steam, it is determined that the inappropriate design on the proportion of heat-absorbing area is responsible for the low reheat steam temperature.An improvement scheme of using the flue gas recirculation to adjust steam temperature is put forward.With this proposed improment scheme of flue gas recirculation,the primary reheat steam temperature and secondary reheat steam temperature can be increased to over 610 ℃ for the 75% turbine heat acceptance condition(THA),and to nearly 600 ℃ for 50% THA condition.,.
Ultra-supercritical units with secondary reheat cycle have been being in China.The reheat steam temperature of is often lower than design value,especially under rated load operation.In this paper,the low reheat steam temperature of the Taizhou Power Plant is discussed as an example,in which the double reheat boiler type is SG-2710/33.03-M7050.By comparing and analyzing the thermal absorptions of superheated steam and primary reheat steam and secondary reheat steam, it is determined that the inappropriate design on the proportion of heat-absorbing area is responsible for the low reheat steam temperature.An improvement scheme of using the flue gas recirculation to adjust steam temperature is put forward.With this proposed improment scheme of flue gas recirculation,the primary reheat steam temperature and secondary reheat steam temperature can be increased to over 610 ℃ for the 75% turbine heat acceptance condition(THA),and to nearly 600 ℃ for 50% THA condition.,.
引文
[1] 高昊天,范浩杰,董建聪,等.超超临界二次再热机组的发展[J].锅炉技术,2014,45(4):1-3.GAO Hao-tian,FAN Hao-jie,DONG Jian-cong,et al.Development of ultra supercritical unit with double reheat cycle [J].Boiler Technology,2014,45(4):1-3.
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[7] 李汝萍,齐晓娟,童家麟,等.某600 MW锅炉高温腐蚀和烟温偏差控制的数值模拟研究.[J].热能动力工程,2018,33(9):50-57.LI Ru-ping,QI Xiao-juan,TONG Jia-lin,et al.Numerical study on the control of high temperature corrosion and flue gas temperature deviation for a 660 MW boiler [J].Journal of Engineering for Thermal Energy and Power,2018,33(9):50-57
[8] 刘淼,韩璞,张婷.超超临界二次再热机组再热汽温系统模型辨识[J].计算机仿真,2018,35(5):91-99.LIU Miao,HAN Pu,ZHANG Ting.Reheat system temperature system model identification for ultra-supercritical double reheat units [J].Computer Simulation,2018,35(5):91-99.
[9] 袁世通,崔猛,魏庆海,等.超超临界二次再热蒸汽温度控制策略的分析研究[C]//2016年中国发电厂热工自动化技术论坛,银川,2016:188-193.YUAN Shi-tong,CUI Meng,WEI Qing-hai,et al.Analysis and study on the control strategy of super supercritical two reheat steam temperature control[C]//2016 China Power Plant Thermal Automation Technology Forum,Yinchuan,2016:188-193.
[10] 姚向昱,蒋德勇,朱佳琪,等.二次再热锅炉再热器调温方式对机组热经济性的影响[J].电力勘测设计,2016(3):8-15.YAO Xiang-yu,JIANG De-yong,ZHU Jia-qi,et al.The influence of reheater temperature regulating mode on the thermal economy of the secondary reheat boiler[J].Electric Power Survey Design,2016(3):8-15.
[11] 杨新民,吴恒运,茅义军.超超临界二次再热机组再热汽温的控制[J].中国电力,2016,49(1):19-22.YANG Xin-min,WU Heng-yun,MAO Yi-jun.Reheat steam temperature control of an ultra supercritical unit with second reheat cycle [J].Electric Power,2016,49(1):19-22.
[12] 李永生,谭锐,徐星.1 000 MW超超临界二次再热机组滑压运行优化[J].电力科技与环保,2018,34(3):53-55.LI Yong-sheng,TAN Rui,XU Xing.Study on optimization of sliding pressure operation of 1 000 MW double reheat ultra-supercritical unit [J].Electrical environmental protection and technology,2018,34(3):53-55.
[13] 陶谦,陈有福,管诗骈,等.1 000 MW超超临界二次再热示范机组锅炉汽温偏差的消除[J].锅炉技术,2016,47(6):16-20.TAO Qian,CHEN You-fu,GUAN Shi-pian,et al.The elimination of boiler steam temperature deviation in a 1 000 MW demonstration ultra-supercritical unit with double reheat cycles [J].Boiler Technology,2016,47(6):16-20.
[14] 范庆伟,柴琦,茅义军,等.二次再热机组锅炉烟气再循环方案[J].热力发电,2017(8):131-135.FAN Qing-wei,CHAI Qi,MAO Yi-jun,et al.Flue gas recirculation scheme for double reheat boilers [J].Thermal Power Generation,2017(8):131-135.
[15] 郭馨,赵广播,孙志浩,等.再循环烟气对660 MW二次再热锅炉蒸汽参数的影响[J].中国电机工程学报,2017,38(4):1-10.GUO Xin,ZHAO Guang-bo,SUN Zhi-hao,et al.Effect of recirculated flue gas on steam parameters of 660 MW double reheat boiler[J].Proceedings of the CSEE ,2017,38(4):1-10.
[16] 石书雨,李志,赵超,等.超超临界二次再热锅炉热力计算系统的研发及工程应用[J].中国电力,2017,50(2):75-81.SHI Shu-yu,LI Zhi,ZHAO Chao,et al.Development and engineering application of thermal calculation system for double reheat ultra-supercritical boilers [J].Electric Power,2017,50(2):75-81.
[2] 徐俊,刘启明,白英民,等.1 000 MW超超临界燃煤机组二次再热技术现状及其市场前景分析[J].东方电气评论,2015,29(115):85-88.XU Jun,LIU Qi-ming,BAI Ying-min,et al.Market-prospect analysis and development status of 1 000 MW high-capacity ultra-supercritical coal-fired unit with double reheat cycles[J].Dongfang Electric Review,2015,29(115):85-88.
[3] 阳光,陈仁杰,朱佳琪.1 000 MW超超临界二次再热燃煤发电示范工程总体设计方案[J].中国电力,2017,50(6):12-16.YANG Guang,CHEN Ren-jie,ZHU Jia-qi.General design of 1 000 MW ultra-supercritical double-reheat demonsmonstration power plant [J].Electric Power,2017,50(6):12-16.
[4] 王月明,牟春华,姚明宇,等.二次再热技术发展与应用现状[J].热力发电,2017,8(8):46-56.WANG Yue-ming,MU Chun-hua,YAO Ming-yu,et al.Review of the development and application of double reheat power generation technology [J].Thermal Power Generation,2017,8(8):46-56.
[5] 姚丹花,褚育枫.1 000 MW二次再热超超临界塔式锅炉设计特性[J].锅炉技术,2017,48(5):1-6.YAO Dan-hua,CHU Yu-feng.Design characteristics of 1 000 MW double reheat ultra-supercritical tower boiler[J].Boiler Technology,2017,48(5):1-6.
[6] 许龙虎.二次再热机组再热汽温控制方案研究[J].电力勘测设计,2016.8(4):39-44.XU Long-hu.Discussion on the reheat steam temperature regulation scheme in double reheat unit [J].Electric Power Survey Design,2016,8(4):39-44.
[7] 李汝萍,齐晓娟,童家麟,等.某600 MW锅炉高温腐蚀和烟温偏差控制的数值模拟研究.[J].热能动力工程,2018,33(9):50-57.LI Ru-ping,QI Xiao-juan,TONG Jia-lin,et al.Numerical study on the control of high temperature corrosion and flue gas temperature deviation for a 660 MW boiler [J].Journal of Engineering for Thermal Energy and Power,2018,33(9):50-57
[8] 刘淼,韩璞,张婷.超超临界二次再热机组再热汽温系统模型辨识[J].计算机仿真,2018,35(5):91-99.LIU Miao,HAN Pu,ZHANG Ting.Reheat system temperature system model identification for ultra-supercritical double reheat units [J].Computer Simulation,2018,35(5):91-99.
[9] 袁世通,崔猛,魏庆海,等.超超临界二次再热蒸汽温度控制策略的分析研究[C]//2016年中国发电厂热工自动化技术论坛,银川,2016:188-193.YUAN Shi-tong,CUI Meng,WEI Qing-hai,et al.Analysis and study on the control strategy of super supercritical two reheat steam temperature control[C]//2016 China Power Plant Thermal Automation Technology Forum,Yinchuan,2016:188-193.
[10] 姚向昱,蒋德勇,朱佳琪,等.二次再热锅炉再热器调温方式对机组热经济性的影响[J].电力勘测设计,2016(3):8-15.YAO Xiang-yu,JIANG De-yong,ZHU Jia-qi,et al.The influence of reheater temperature regulating mode on the thermal economy of the secondary reheat boiler[J].Electric Power Survey Design,2016(3):8-15.
[11] 杨新民,吴恒运,茅义军.超超临界二次再热机组再热汽温的控制[J].中国电力,2016,49(1):19-22.YANG Xin-min,WU Heng-yun,MAO Yi-jun.Reheat steam temperature control of an ultra supercritical unit with second reheat cycle [J].Electric Power,2016,49(1):19-22.
[12] 李永生,谭锐,徐星.1 000 MW超超临界二次再热机组滑压运行优化[J].电力科技与环保,2018,34(3):53-55.LI Yong-sheng,TAN Rui,XU Xing.Study on optimization of sliding pressure operation of 1 000 MW double reheat ultra-supercritical unit [J].Electrical environmental protection and technology,2018,34(3):53-55.
[13] 陶谦,陈有福,管诗骈,等.1 000 MW超超临界二次再热示范机组锅炉汽温偏差的消除[J].锅炉技术,2016,47(6):16-20.TAO Qian,CHEN You-fu,GUAN Shi-pian,et al.The elimination of boiler steam temperature deviation in a 1 000 MW demonstration ultra-supercritical unit with double reheat cycles [J].Boiler Technology,2016,47(6):16-20.
[14] 范庆伟,柴琦,茅义军,等.二次再热机组锅炉烟气再循环方案[J].热力发电,2017(8):131-135.FAN Qing-wei,CHAI Qi,MAO Yi-jun,et al.Flue gas recirculation scheme for double reheat boilers [J].Thermal Power Generation,2017(8):131-135.
[15] 郭馨,赵广播,孙志浩,等.再循环烟气对660 MW二次再热锅炉蒸汽参数的影响[J].中国电机工程学报,2017,38(4):1-10.GUO Xin,ZHAO Guang-bo,SUN Zhi-hao,et al.Effect of recirculated flue gas on steam parameters of 660 MW double reheat boiler[J].Proceedings of the CSEE ,2017,38(4):1-10.
[16] 石书雨,李志,赵超,等.超超临界二次再热锅炉热力计算系统的研发及工程应用[J].中国电力,2017,50(2):75-81.SHI Shu-yu,LI Zhi,ZHAO Chao,et al.Development and engineering application of thermal calculation system for double reheat ultra-supercritical boilers [J].Electric Power,2017,50(2):75-81.