基于[火用]的新型冷端余热利用供热系统分析  

Analysis of a New Cold End Waste Heat Utilization Heating System Based on Exergy

作　　者：肖卓楠[1,2] 霍立伟 张荣 李科[2] 何丽娟[2] XIAO Zhuonan;HUO Liwei;ZHANG Rong;LI Ke;HE Lijuan(Carbon Neutralization Collaborative Innovation Center of Inner Mongolia Autonomous Region,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学内蒙古自治区碳中和协同创新中心,内蒙古包头014010 [2]内蒙古科技大学能源与环境学院,内蒙古包头014010

出　　处：《动力工程学报》2023年第4期505-510,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51966016)。

摘　　要：以某315 MW亚临界机组为研究对象,构建了一种新型冷端余热利用系统,基于热力学定律和[火用]分析理论,对该系统的热力性能进行分析,并将其与抽汽供热、高背压供热和热泵供热方式进行比较。结果表明:新系统运行时,在一定的供回水温度及流量下,随着背压的升高,机组整体的热力性能先升高后降低,背压为23 kPa时热力性能达到最佳;在其他条件一定的情况下,相比于其他供热方式,供水温度越高,新系统优势越明显;新系统并不适用于供水温度过低的情况,回水温度为50℃时,其供水温度最低只能达到78℃。Taking a 315 MW subcritical unit as an object,a new cold end waste heat utilization system was designed.Based on the laws of thermodynamics and exergic analysis theory,its thermal performance was analyzed and compared with other heating methods,such as steam extraction heating,high back pressure heating and absorption heat pump heating.Results show that when the new system is running,the temperature and flow of the supply and return water are guaranteed to be constant,with the increase of back pressure,the thermal performance of the unit first increases and then decreases.The best back pressure is 23 kPa.Under certain conditions,with the increase of water supply temperature,the new system has obvious advantages compared with extraction steam heating,high back pressure heating and absorption heat pump heating.And the higher the water temperature,the more obvious the advantage of the new system.However,it is not suitable for the condition of low water supply temperature.When the return water temperature is 50℃,the minimum water supply temperature can only reach 78℃.

关 键 词：热电联产 余热利用 高背压 吸收式热泵 [火用] 

分 类 号：TK11[动力工程及工程热物理—热能工程]