某660MW燃煤机组深度耦合余热利用系统优化  

Optimization of Deep Coupled Waste Heat Utilization System for a 660 MW Coal-fired Unit

作　　者：汪前成 陆永好 史鑫 杨智 简羽翔 Wang Qiancheng;Lu Yonghao;Shi Xin;Yang Zhi;Jian Yuxiang(Guoneng Shenwan Hefei Power Generation Co.,Ltd.,Hefei 231551,China;Jiangsu Huifeng Renhe Environmental Protection Technology Co.,Ltd.,Taizhou 225300,Jiangsu Province,China)

机构地区：[1]国能神皖合肥发电有限责任公司,合肥231551 [2]江苏慧峰仁和环保科技有限公司,江苏泰州225300

出　　处：《发电设备》2024年第6期364-369,共6页Power Equipment

摘　　要：针对某660 MW燃煤机组原深度耦合余热利用系统存在的问题,分析了该系统未达到设计目标的原因,采取了旁路烟道优化、凝结水换热器取水位置优化、再循环管路优化、增加烟气冷却器水侧旁路4种改造方案,并对最终的优化改造效果进行了详细的计算分析。结果表明:优化改造后,旁路烟气量比例上升至13.5%,凝结水换热器进口水温可以长期稳定在70℃,辅助蒸汽换热器的蒸汽用量基本降至0;优化后投运该系统,机组的供电煤耗率降低了2.73 g/(kW·h)。In response to the problems existing in the original deep coupled waste heat utilization system of a 660 MW coal-fired unit,the reasons for the failure to achieve the design goals of the system were analysed.Four optimization and renovation schemes were strategically adopted,including the optimization of bypass flue,the optimization of water intake position for condensate heat exchanger,the optimization of recirculation pipeline and adding a water side bypass for the flue gas cooler.The final optimization and renovation effect was calculated and analysed in detail.Results show that,after the optimization,the proportion of bypass flue gas volume increases to 13.5%,the inlet water temperature of the condensate heat exchanger can be stabilized at 70℃for a long time,and the steam consumption of the auxiliary steam heat exchanger is basically reduced to 0.After optimization,the system is put into operation to reduce the net coal consumption rate of the unit by 2.73 g/(kW·h).

关 键 词：燃煤机组 余热利用系统 旁路烟道 再循环 水侧旁路 辅助蒸汽换热器 

分 类 号：TM621[电气工程—电力系统及自动化] TK115[动力工程及工程热物理—热能工程]