陶瓷膜法电厂烟气水热回收系统技术经济分析  

Techno-economic Analysis of Ceramic Membrane-based Flue Gas Water and Heat Recovery System in a Power Plant

作　　者：杜紫薇 陈海平[1] 黄吉光 赵春昊 张衡[1] DU Ziwei;CHEN Haiping;HUANG Jiguang;ZHAO Chunhao;ZHANG Heng(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《动力工程学报》2022年第10期967-976,共10页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2018YFB0604300)。

摘　　要：采用多孔陶瓷膜回收烟气中的水分和余热,将回收的热量并入电厂热力系统,从全厂热经济性的角度评价膜法烟气水热回收系统的节水和节能潜力。以某330 MW燃煤发电机组为例,在脱硫塔后尾部烟道安装膜面积为1300m^(2)的陶瓷膜组件,结合热泵技术,将回收的烟气余热用于加热热网回水,回收的水汇入冷却塔作为电厂补水,建立了耦合膜法烟气水热回收系统的全厂热力系统模型,并对系统进行了技术经济性分析。结果表明:冷却水的体积流量增加和进口温度降低会增加系统水回收量和热回收量,但并不能增加节煤率;系统最高水回收量为35.74kg/(m^(2)·h),最大节煤率为1.37g/(kW·h);全年可实现节煤677.84t、节水233254.04t,投资回收周期约为5.2a。Porous ceramic membrane was used to recover water and waste heat from the flue gas,and the recovered heat was incorporated into the thermal system of the power plant.The water saving and energy saving potential of the membrane-based flue gas water and heat recovery system was evaluated from the perspective of thermal economy of the whole plant.Taking a 330MW coal-fired generator set as an exam-ple,the ceramic membrane module with 1300m^(2) membrane area was installed in the flue gas duct at the tail end of the desulfurization tower.Combined with the heat pump technology,the recovered flue gas waste heat was used to heat the return water of the heating network,and the recovered water was poured into the cooling tower for water supplement in the power plant.The mathematical model of the whole thermal system of the coupled membrane flue gas water and heat recovery system was established,and the techno-economic analysis of the system was carried out.Results show that the increase of cooling water flow and the decrease of inlet temperature will increase the water and heat recovery of the system,but can not improve the coal saving rate.The system can achieve water recovery of up to 35.74kg/(m^(2)·h),coal saving rate of 1.37g/(kW·h),annual coal saving of 677.84t,and water saving of 233254.04t.The in-vestment recovery period of the system is 5.2years.

关 键 词：燃煤电厂 余热回收 陶瓷膜 煤耗 节水 技术经济性分析 

分 类 号：TK09[动力工程及工程热物理]