供热系统串联布置方式的应用  

Applied Research on the Serial Distribution Mode of Heating System

作　　者：林振娴[1] 杨勇平[1] 何坚忍[1] 赵志渊[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2010年第35期13-17,共5页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB219801)~~

摘　　要：针对目前国内大多数热电厂都是采用供热系统并联布置方式运行的现状,通过分析热电联产系统的联合特性,提出在无节流工况后采用供热系统串联布置的方式运行,以减小节流损失,提高机组发电功率。相应地提出几种不同布置方式的模型,对其进行了量化的比较和分析,可知供热系统采用串联布置方式运行时,第1级机组的供热抽汽压力降低,第2级机组供热抽汽压力升高,但整体而言比并联布置方式运行的供热抽汽压力低;为了更好地利用串联第1级机组所减小的供热抽汽压力,可适当增加串联第2级机组热网加热器面积或使用强化传热管,增加其传热性能,使升高了的串联第2级机组供热抽汽压力降低,使机组发电功率增加的更多,实现能源的梯级利用。It was proposed that the system for heating was operated in series distribution after the non-throttle conditions to reduce the throttle loss and improve the power generation through analyzing the combined characteristic of the cogeneration heating and power system, for the current situation that the heating system was used in parallel distribution in the most of power plant in China. At the same time, several different distribution mode models were also proposed, and then compared quantively and analyzed. It can be known that the extraction pressure for heating of the first stage units is decreased and that of the second stage units is increasing when the heating system are operating in series, but, totally, the extraction pressure for heating of units which operats in series is lower than the extraction pressure for heating of units which operats in parallel; in order to better use the extraction pressure for heating reduced by the first stage unites which operates in series, the thermal system heater area should be increased or the enhanced heat transfer tube should be used, so, they can increase the heat transfer performance to decrease the extraction pressure for heating of the second stage units in series, which increased in originally; so that the generating capacity increases more and the energy cascade utilization is achieved.

关 键 词：串联 热电联产 联合特性 发电功率 梯级利用 

分 类 号：TK11[动力工程及工程热物理—热能工程]