燃煤机组排烟温度调控及水分回收研究  

Study on Flue Gas Temperature Control and Water Recovery of Coal-fired Units

作　　者：陈程 陈鑫[2] 徐凤 吴斌 李元媛 陆规[2] CHEN Cheng;CHEN Xin;XU Feng;WU Bin;LI Yuanyuan;LU Gui(China Energy Engineering Group Jiangsu 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 Engineering 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》2024年第4期40-46,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：基于厂级尺度燃煤机组模型,对烟气加热、烟气冷凝、烟气冷凝再热等多种排烟温度调控技术方案进行评价,定量阐述冷凝法在烟气余热利用、污染物控制及水分回收的协同效果。定量对比地表水、冷却塔和吸收式热泵多种冷源方案的能耗及水分回收效果。研究表明:当脱硫塔出口烟气温度为50.5℃时,要保证不出现湿烟羽,环境温度需要37℃以上,需要烟气调温技术才能满足。冷凝法冷源温度越低,冷凝效果越好,其中冬季地表水冷源冷却效果最好,可回收36443.32 t/h烟气水分。考虑全年运行情况,冷凝法最优冷源方式为吸收式热泵蒸发器的冷却循环水,可回收34309.14 kg/h的凝结水。Based on the plant-scale coal-fired units model,multiple exhaust gas temperature control technology options such as flue gas heating,flue gas condensing,and flue gas condensing reheat are evaluated to quantitatively elaborate the synergistic effects of condensing method in flue gas waste heat utilization,pollutant control,and moisture recovery.The energy consumption and moisture recovery effects of various cooling source solutions,such as surface water,cooling tower,and absorption heat pump,are quantitatively compared.The study shows that when the flue gas temperature at the outlet of the desulfurization tower is 50.5℃,the ambient temperature needs to be above 37℃,and flue gas temperature control technology is required to meet this requirement.The lower the temperature of the cold source of the condensing method,the better the condensation effect.The cooling effect of the surface water cold source in winter is the best,recovering 36443.32 t/h flue gas moisture.Considering the year-round operation,the optimal cold source method of condensing is the circulating cooling water of absorption heat pump evaporator,which can recover 34309.14 kg/h of condensate water.

关 键 词：烟气调温 水分回收 冷源 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]