BEST技术用于超超临界二次再热机组的可行性分析
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摘要
为降低二次再热发电机组的回热抽汽过热度,提高机组经济性,提出了采用背压抽汽汽轮机(BEST)的节能配置方案。通过介绍BEST技术在回热汽源、排汽走向、材料选用等方面的特点,详细阐述了采用BEST技术的二次再热发电机组在设计、制造、运行与控制中的技术难点,对BEST技术用于高参数二次再热发电机组的可行性进行了技术探讨和经济性分析。分析结果表明,采用BEST技术,单台机组初投资可减少约2 400万元,年利润可增加约4 500万元。
To lower the superheat degree of the extraction steam of the heat regenerative system and improve the economic efficiency of the double-reheat power generating units, an energy-saving plan with the backpressure extraction steam turbine(BEST) allocated is proposed. Through the introduction of the BEST characteristics such as heat recovery steam source, exhaust direction and material selection, the technical issues in the design, manufacturing, operation and control of the double-reheat power generating units adopting BEST are presented, and the feasibility and economic performance of BEST used in high-parameter double-reheat power generating units are also analyzed. The analysis results show that with the BEST technology adopted, the investment of single unit can be reduced by about 24 million RMB while the annual profit can be increased by about 45 million RMB.
To lower the superheat degree of the extraction steam of the heat regenerative system and improve the economic efficiency of the double-reheat power generating units, an energy-saving plan with the backpressure extraction steam turbine(BEST) allocated is proposed. Through the introduction of the BEST characteristics such as heat recovery steam source, exhaust direction and material selection, the technical issues in the design, manufacturing, operation and control of the double-reheat power generating units adopting BEST are presented, and the feasibility and economic performance of BEST used in high-parameter double-reheat power generating units are also analyzed. The analysis results show that with the BEST technology adopted, the investment of single unit can be reduced by about 24 million RMB while the annual profit can be increased by about 45 million RMB.
引文
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[14]赵毅,安敏善.回热再热汽轮机热力系统参数综合优化研究[J].中国电机工程学报,1991,11(1):49-56.ZHAO Yi,AN Minshan.A study of comprehensive optimization for regenerative reheat units power system parameters[J].Proceedings of the CSEE,1991,11(1):49-56.
[15]曹昊,王亚军.神华国华广投北海电厂2×1 000 MW新建工程初步设计T-turbine技术专题报告[R].上海:华东电力设计院,2015.
[16]杨宇,夏晓华,蒋俊.超超临界1 000 MW机组梯次循环热力系统能损分析及优化[J].热力发电,2015,44(8):74-78.YANG Yu,XIA Xiaohua,JIANG Jun.Energy loss analysis and optimization on an ultra supercritical 1 000 MW unit thermal system using echelon cycle[J].Thermal Power Generation,2015,44(8):74-78.
[17]朱朝阳.BEST热力系统焓升分配和再热蒸汽压力优化[J].热力发电,2017,46(4):88-92.ZHU Chaoyang.Enthalpy rise distribution and optimization of reheat steam pressure for BEST system[J].Thermal Power Generation,2017,46(4):88-92.
[18]赵勇,王路路,赵祎涵,等.双馈风力发电机定子绕组匝间短路故障特征提取[J].热力发电,2016,45(8):63-67.ZHAO Yong,WANG Lulu,ZHAO Yihan,et al.Feature extraction of stator winding inter-turn short circuit fault in doubly-fed induction generator[J].Thermal Power Generation,2016,45(8):63-67.
[2]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 Haotian,FAN Haojie,DONG Jiancong,et al.Development of ultra supercritical unit with double reheat cycle[J].Boiler Technology,2014,45(4):1-3.
[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 Renjie,ZHU Jiaqi.General design of 1 000-MW ultra-supercritical double-reheat demonstration power plant[J].Electric Power,2017,50(6):12-16.
[4]杨宇,范世望,蒋俊,等.超超临界1 000 MW机组加热器对系统热耗率的影响[J].热力发电,2016,45(5):79-83.YANG Yu,FAN Shiwang,JIANG Jun,et al.Influence of heater on heat consumption rate of an ultra supercritical 1 000 MW unit steam turbine[J].Thermal Power Generation,2016,45(5):79-83.
[5]KJAER S,DRINHAUS F,KJAER S,et al.A modified double reheat cycle[C]//ASME 2010 Power Conference.Chicago,USA,2010:285-293.
[6]高嵩,赵洁,黄迪南.1 000 MW超超临界二次再热燃煤发电技术[J].中国电力,2017,50(6):6-11.GAO Song,ZHAO Jie,HUANG Dinan.Double-reheat coal-fired power generation technologies for 1 000-MW ultra-supercritical units[J].Electric Power,2017,50(6):6-11.
[7]牛海明,邱忠昌,黄焕袍.1 000 MW二次再热超超临界机组再热汽温控制策略及工程应用[J].中国电力,2017,50(9):138-142.NIU Haiming,QIU Zhongchang,HUANG Huanpao.The reheat steam temperature control strategy for the 1 000 MW ultrasupercritical double-reheat unit and its application[J].Electric Power,2017,50(9):138-142.
[8]迟成宇,于鸿垚,谢锡善.世界700℃等级先进超超临界电站关键高温材料[J].世界钢铁,2013(2):42-59,63.CHI Chengyu,YU Hongyao,XIE Xishan.Critical high temperature materials for 700℃A-USC power plants[J].World Iron and Steel,2013(2):42-59,63.
[9]毛健雄.700℃超超临界机组高温材料研发的最新进展[J].电力建设,2013,34(8):69-76.MAO Jianxiong.Latest development of high-temperature metallic materials in 700℃ultra-supercritical units[J].Electric Power Construction,2013,34(8):69-76.
[10]毕凯,周荣灿,唐丽英.700℃超超临界机组锅炉用617B合金的烟气腐蚀行为研究[J].热力发电,2016,45(2):68-74.BI Kai,ZHOU Rongcan,TANG Liying.Fire-side corrosion behavior of alloy 617B used for 700℃ultra-supercritical unit boiler[J].Thermal Power Generation,2016,45(2):68-74.
[11]中国国家机械工业部.钢制压力容器-分析设计标准(2005年确认):JB 4732-1995[S].北京:机械工业出版社,2005.
[12]中国国家标准化管理委员会.压力容器:GB 150.1~150.4-2011[S].北京:中国标准出版社,2012.
[13]韩宾,徐庆磊,胡方,等.1 000 MW二次再热机组高压加热器系统开发及应用[J].中国电力,2017,50(6):17-20.HAN Bin,XU Qinglei,HU Fang,et al.Development and application of HP heater system for 1 000-MW double reheat units[J].Electric Power,2017,50(6):17-20.
[14]赵毅,安敏善.回热再热汽轮机热力系统参数综合优化研究[J].中国电机工程学报,1991,11(1):49-56.ZHAO Yi,AN Minshan.A study of comprehensive optimization for regenerative reheat units power system parameters[J].Proceedings of the CSEE,1991,11(1):49-56.
[15]曹昊,王亚军.神华国华广投北海电厂2×1 000 MW新建工程初步设计T-turbine技术专题报告[R].上海:华东电力设计院,2015.
[16]杨宇,夏晓华,蒋俊.超超临界1 000 MW机组梯次循环热力系统能损分析及优化[J].热力发电,2015,44(8):74-78.YANG Yu,XIA Xiaohua,JIANG Jun.Energy loss analysis and optimization on an ultra supercritical 1 000 MW unit thermal system using echelon cycle[J].Thermal Power Generation,2015,44(8):74-78.
[17]朱朝阳.BEST热力系统焓升分配和再热蒸汽压力优化[J].热力发电,2017,46(4):88-92.ZHU Chaoyang.Enthalpy rise distribution and optimization of reheat steam pressure for BEST system[J].Thermal Power Generation,2017,46(4):88-92.
[18]赵勇,王路路,赵祎涵,等.双馈风力发电机定子绕组匝间短路故障特征提取[J].热力发电,2016,45(8):63-67.ZHAO Yong,WANG Lulu,ZHAO Yihan,et al.Feature extraction of stator winding inter-turn short circuit fault in doubly-fed induction generator[J].Thermal Power Generation,2016,45(8):63-67.