用于热电联产的蒸汽引射器结构优化研究  

Research on Structural Optimization of Steam Ejector for Cogeneration

作　　者：庞敬帅 熊念 张尤俊 戈志华[1] 杜小泽[1] PANG Jingshuai;XIONG Nian;ZHANG Youjun;GE Zhihua;DU Xiaoze(Key Laboratory of Power Station Energy Transfer Conversion and System,Ministry of Education,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《动力工程学报》2023年第7期941-950,共10页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划课题资助项目(2020YFB0606202)。

摘　　要：为提升热电联产系统中蒸汽引射器性能,对引射器不同结构参数进行优化研究。以某典型2×350 MW热电联产机组为例,确定引射器设计参数并建立数值模型,采用单参数结构优化分析混合腔直径、喉嘴距和入口倾角等结构参数对引射性能的影响,通过正交试验进行多参数结构优化,得到各结构的敏感性分析结果和引射性能相对最优的结构组合,在此基础上分析热电联产机组变工况条件下引射器适用性及运行策略。结果表明:多参数结构优化可进一步提升引射系数至0.945,较初始设计引射器增幅达18.7%,引射性能明显提升;热电联产机组变工况下引射器动力蒸汽压力和出口背压需控制在合理范围以维持较高引射系数,实际运行中通过增大吸入蒸汽压力提升引射器性能的效果不明显。In order to improve the performance of the steam ejector in the cogeneration system,the different structural parameters of the ejector were optimized.Taking a typical 2X350 MW cogeneration unit as an example,the design parameters of the ejector were determined and a numerical model was established.The effects of structural parameters such as the diameter of the constant section mixing cavity,nozzle exit position,and inlet angle of the mixing cavity on the ejector performance were analyzed using single-factor structural optimization.Multi-factor structural optimization was then carried out through the orthogonal test to gain the sensitivity of each factor and the relatively optimal structural combination.On this basis,the ejector applicability and operation strategy were investigated under variable working conditions of cogeneration units.Results show that the multi-factor structure optimization can further improve the entrainment ratio to 0.945,an increase of 18.7% compared with the original ejector,and the performance of the ejector is significantly improved.The motive steam pressure and outlet back pressure of the ejector shall fall in a rational range to obtain a higher entrainment ratio under variable working conditions of cogeneration units.It is not very operable to improve the performance of the ejector by increasing the suction steam pressure in practical applications.

关 键 词：热电联产 蒸汽引射器 结构优化 数值模拟 正交试验 

分 类 号：TM611.3[电气工程—电力系统及自动化]