火电厂乏汽-烟气余热耦合提质利用热泵系统研究  

Study on Heat Pump System for Coupled Grade-updated Utilization of Waste Heat of Exhaust Steam and Flue Gas in Thermal Power Plants

作　　者：陈程 陈鑫[2] 徐凤 吴斌 肖军 李元媛[2] 陆规[2] CHEN Cheng;CHEN Xin;XU Feng;WU Bin;XIAO Jun;LI Yuanyuan;LU Gui(China Energy Construction Group Jiangsu Electric Power Design Institute Co.,Ltd.,Nanjing 211102,Jiangsu,China;School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;China Energy Construction Group Anhui Electric Power Design Institute Co.,Ltd.,Hefei 230022,Anhui,China)

机构地区：[1]中国能源建设集团江苏省电力设计院有限公司,江苏南京211102 [2]华北电力大学能源动力与机械工程学院,北京102206 [3]中国能源建设集团安徽省电力设计院有限公司,安徽合肥230022

出　　处：《制冷技术》2020年第5期41-46,52,共7页Chinese Journal of Refrigeration Technology

基　　金：中国能源建设集团众筹科技(No.CEEC-ZC-2018-011);国家自然科学基金(No.51876057)。

摘　　要：本文采用系统热力学建模方法构建燃煤电厂级尺度热力系统模型,提出一种新的汽轮机乏汽余热及锅炉排烟烟气余热能量品质耦合提升及利用系统进行了性能分析研究。分析了旁路烟气温度、循环水温及其凝结水旁路温度等对耦合利用系统性能的影响。结果表明:采用烟气旁路作为热泵系统驱动热源,设计热泵系统性能系数(COP)达1.70,从循环冷却水和烟气吸热31.93 MW,给凝结水提供77.55 MW的热量,可节约煤耗量2.1 g/(kW·h)左右,烟气冷凝水产生量可达70 t/h,凝结水中脱除烟气中的可溶性颗粒可达65.40 t/年,节能节水减排潜力巨大。In this work,a system thermodynamic modeling method is used to build a thermal system model of a coal-fired power plant.The performance analysis and utilization system of a new steam turbine exhaust heat and boiler flue gas waste heat energy quality coupling improvement and utilization system are carried out.The effects of the bypass flue gas temperatures,circulating water temperatures and condensate bypass temperatures on the performance of the coupled utilization system are analyzed.The results show that,the system uses flue gas bypass as the heat source of the heat pump system,the designed heat pump system has a coefficient of performance(COP)of 1.70,absorbs 31.93 MW of heat from circulating cooling water and flue gas,and provides 77.55 MW of heat to condensate,which can save 2.1 g/(kW·h)of coal consumption.The amount of flue gas condensate produced can reach 70 t/h,and the removal of soluble particles in the flue gas from condensate can reach 65.40 t/year.Such system has great potential for energy saving,water saving and emission reduction.

关 键 词：乏汽余热 烟气余热 能量品质 吸收式热泵 

分 类 号：TQ051.5[化学工程] TK115[动力工程及工程热物理—热能工程]