基于耗散热阻分析的火电机组回热系统抽汽优化  

Optimization of Extraction Steam Flow of Regenerative System Based on the Entransy Dissipation Resistance for Thermal Power Generating Unit

作　　者：柴小明 崔志建 许晓燕 石秀刚 宋继伟[1] CHAI Xiaoming;CUI Zhijian;XU Xiaoyan;SHI Xiugang;Song Jiwei(Institute of Thermal Science and Technology,Shandong University Jinan 250061,China;Huaneng Linyi Power Generation Co.,Ltd.,Linyi 276016,China;Jinan CMC Electric Power Technology Co.,Ltd. Jinan 250021,China)

机构地区：[1]山东大学热科学与工程研究中心,山东济南250061 [2]华能临沂发电有限公司,山东临沂276016 [3]济南康默思电力技术有限公司,山东济南250021

出　　处：《山东电力技术》2019年第1期52-57,共6页Shandong Electric Power

基　　金：华能国际电力股份有限公司科技项目(HNKJ18-ZLSD06)

摘　　要：引入火积耗散理论,对某火电机组回热抽汽系统进行了优化设计。构建了机组高压加热器和低压加热器的火积耗散热阻,并建立了含有各加热器火积耗散热阻的约束方程组,推导机组热耗率的表达式。以各级抽汽量为自变量,机组热耗率最小为目标函数,引入拉格朗日算子,进行优化计算,得到4种设计工况(100%THA,70%THA,50%THA,30%THA)下的各级抽汽量的最优分配,相对原设计热耗率分别降低了17.08 kJ/kWh,16.69 kJ/kWh,29.43 kJ/kWh,93.64 kJ/kWh,对低工况运行经济性的提升明显。In this paper,an optimal design of the regenerative steam extraction system of a thermal power unit was carried out with the theory of entransy dissipation resistance.The entransy dissipation resistances of high pressure heaters and low pressure heaters are constructed,the constraint equations containing the entransy dissipation resistance of each heaters are established,and the calculation expression of the heat dissipation rate of units is derived.Taking the extraction steam flow of all levels as independent variables and taking the minimum heat loss rate of the unit as the objective function,the Lagrangian operator is introduced to carry out optimization calculation,and the optimal distribution numerical values of extraction steam flow of all levels under four design conditions(100%THA,70%THA,50%THA,30%THA) were obtained.Compared with the original design,the unit heat consumption rate is reduced respectively 17.08 kJ/kWh,16.69 kJ/kWh,29.43 kJ/kWh and 93.64 kJ/kWh,the economy of low operating condition is improved obviously.

关 键 词：回热系统 火积耗散热阻 拉格朗日算子 抽汽 优化 

分 类 号：TM621[电气工程—电力系统及自动化]