直接空冷机组全工况最佳背压定值优化方法  

Condenser Pressure Optimization on a Direct Air-cooled Unit in Full Working Conditions

作　　者：顾伟飞 石家魁 黄晓明 沈思言 胡金伟 万杰[2] GU Wei-fei;SHI Jia-kui;HUANG Xiao-ming;SHEN Si-yan;HU Jin-wei;WAN Jie(Zhejiang Energy Technology Research Institute Co.,Ltd.,Hangzhou 311121,China;Harbin Institute of Technology,Harbin 150001,China;North China Electric Power University,Ji'an 343009,China;East China Electric Power Design Institute Co.,Ltd.,of China Power Engineering Consulting Group,Shanghai 200063,China)

机构地区：[1]浙江浙能技术研究院有限公司,杭州311121 [2]哈尔滨工业大学,哈尔滨150001 [3]华能国际电力股份有限公司井冈山电厂,吉安343009 [4]中国电力工程顾问集团华东电力设计院有限公司,上海200063

出　　处：《汽轮机技术》2023年第2期136-140,共5页Turbine Technology

基　　金：浙能集团科技项目(No.ZNKJ-2017-075);国家重点研发计划项目(No.2017YFB0902101)。

摘　　要：背压对直接空冷机组的经济运行影响显著。提出机组净收益功率最大作为机组最佳背压优化的目标函数,用以求解并指导机组的最佳背压定值优化。综合考虑机组背压与排汽焓的耦合关系,设计了空冷凝汽器背压的迭代求解方法,进一步给出了最佳背压的全工况定值优化方法。以某600MW直接空冷机组为例,计算并获得了机组在多种典型环境温度和汽轮机负荷下的最佳背压,给出了最佳背压的全工况拟合多项式曲线,方法可用于最佳背压的多区域离线划分和定值优化,以避免背压的大范围频繁调节。Back pressure has a significant influence on the economic operation of direct air cooling units.The maximum net profit power of the unit is proposed as the objective function of optimal back pressure optimization to solve and guide the optimal constant value optimization of optimal back pressure of the unit.Considering the coupling relationship between unit back pressure and exhaust steam enthalpy,an iterative method was designed to solve the back pressure of air condensing condenser,and a constant optimization method of optimal back pressure under all working conditions was given.Taking a 600MW direct air cooling unit as an example,the optimum back pressure of the unit is calculated and obtained under various typical ambient temperatures and turbine loads,and the polynomial curve of the optimum back pressure is given.The method can be used for multi-zone off-line division and constant value optimization of the optimum back pressure,so as to avoid frequent adjustment of the back pressure in a wide range.

关 键 词：直接空冷 全工况 最佳背压 定值优化 

分 类 号：TK264[动力工程及工程热物理—动力机械及工程]