火电机组凝汽器改造方案性能的数值模拟  

Numerical Simulation of Condenser Performance for Retrofit Scheme in a Thermal Power Generation Unit

作　　者：胡刚 张焱儒 汪瑞平 林明星 HU Gang;ZHANG Yanru;WANG Ruiping;LIN Mingxing(Shaanxi Energy Linbei Power Generation Co.,Ltd.,Shaanxi 721599,China;Shanghai Turbine Works Co.,Ltd.,Shanghai 200240,China)

机构地区：[1]陕西能源麟北发电有限公司,陕西721599 [2]上海汽轮机厂有限公司,上海200240

出　　处：《热力透平》2024年第4期262-265,275,共5页Thermal Turbine

摘　　要：凝汽器是发电机组的重要设备之一,其内部冷凝管束的布置形式会极大地影响其工作性能。建立了凝汽器壳侧流动与传热的稳态单相数值计算模型,基于改造原则对某火电机组凝汽器布管进行了改造,并对布管方案改造前后凝汽器的热力性能进行了数值模拟研究。数值结果显示,改造后的凝汽器壳侧整体流动呈向心分布,管束区域没有明显的涡流和空气聚集,表明了改造措施可以有效改善凝汽器壳侧的流动特性,提高整体传热性能,降低机组背压,同时改造原则得到了验证。研究成果可以为火电机组凝汽器布管方案的设计或改造提供参考。Condenser is one of the key components in power generation unit,and the layout of the internal condensation tube bundle has a significant impact on its operation performance.A steady⁃state single⁃phase numerical calculation model of the flow and heat transfer on the shell side of the condenser was established.Based on the principles of modification,the tube layout of condenser was redesigned,and numerical simulations were conducted to compare the thermal performance of condenser in a thermal power plant before and after the modification.The numerical results indicated that the overall flow on the shell side of the modified condenser exhibited a centripetal distribution,and there were no significant vortices or air accumulation in the tube bundle area.Thus,it was verified that the modification measures could effectively enhance the flow characteristics on the shell side of the condenser,improve the overall heat transfer performance and reduce the back pressure.Meanwhile,the principles of modification were validated.The research findings can provide reference for design or retrofit of tube layout schemes of condensers in thermal power plants.

关 键 词：凝汽器 管束布置 改造 性能 数值模拟 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]