电厂循环冷却水余热利用分析  

Waste heat recovery from circulating cooling water in power plants

作　　者：顾煜炯[1] 耿直[1] 谢典[1] 徐婧[1] 熊京[1] 

机构地区：[1]华北电力大学国家火力发电工程技术研究中心,北京102206

出　　处：《热力发电》2016年第4期35-40,共6页Thermal Power Generation

基　　金：中央高校基本科研业务费专项资金(2015XS88)

摘　　要：针对电厂循环冷却水直接排放造成生态环境热污染的问题,通过Fluent软件对电厂的温排水排入受纳水域过程进行了二维数值模拟,从环保角度分析了余热回收利用的重要性,提出了吸收式热泵与有机朗肯循环发电综合利用的设计方案。同时,采取有机工质环己烷作为余热发电系统的循环工质,根据热力学第一、二定律,建立了余热回收的数学模型,利用窄点分析法,通过MATLAB和REFPROP软件编程模拟,分析了该方案系统内各部件的损失,对系统参数进行了优化,确立了最佳的系统循环热效率、火用效率及热回收率,论证了方案的可行性。分析结果表明:本文系统方案既可有效回收电厂循环冷却水的部分低品位余热,获取部分余热发电效益,又有益于环境保护。Direct discharge of circulating cooling water from power plants will cause thermal pollution of ecological environment.By Fluent software,two-dimensional numerical simulation on the process of waste water being discharged into the received water was carried out,and the importance of recycling waste heat was analyzed from the point of the environment.Thus,comprehensive utilization of absorption heat pump and organic Rankine cycle power generation technology was put forward.The organic working fluid cyclohexane was taken as the cycle working substance and a mathematical model of waste heat recovery was established based on the first and second law of thermodynamics.By pinch analysis method,on the basis of Matlab software and Refprop programming simulation,the exergy losses of each component of the system was analyzed and the system parameters were optimized to obtain the optimal systematic cycle thermal efficiency,exergy efficiency and heat recovery efficiency.Furthermore,the feasibility of the scheme was demonstrated.The results show that this scheme not only can effectively recover part of low-grade waste heat from circulating cooling water in power plant,but also has great significance in environment protection.

关 键 词：电厂 循环冷却水 余热 热污染 环境保护 有机朗肯循环 火用效率 

分 类 号：TK115[动力工程及工程热物理—热能工程] TK123