直接空冷机组单风道地下进风数值分析  

Numerical Analysis of Direct Air-Cooling Unit with Single Duct Underground Ventilation

作　　者：齐阳阳 吴红杰[1] 刘辉[1] 

机构地区：[1]电站设备状态检测与控制教育部重点实验室(华北电力大学),河北省保定市071003

出　　处：《电力建设》2014年第5期94-98,共5页Electric Power Construction

摘　　要：地上进风直接空冷机组受环境风影响,边缘风机出现热风回流和"倒灌"现象,使机组换热效率降低、凝汽器压力升高,为此提出了单风道地下进风的冷却方式。利用数值模拟Fluent软件,对某600 MW机组空冷岛外部流场进行了数值模拟,分析地下进风方式下风机通风量、机组换热效率和凝汽器压力受环境风影响情况,并与地上进风方式相比较。实验结果表明,采用地下进风方式极大地提高了凝汽器的换热效率,使凝汽器压力维持在较低且平稳的状态,保证机组安全经济运行。Due to the influence of environmental wind on direct air-cooling unit with overground ventilation,the hot air recirculation and intrusion phenomenon occurred on the edge fan,which would cause the decrease of unit＇ s heat transfer efficiency and the increase of condenser pressure.Therefore,this paper proposed a cooling mode with single duct underground ventilation.The external flow field of air cooling island in a 600 MW unit was numerically simulated with using Fluent software.Then,the influence of environmental wind on fan ventilation,unit＇ s heat transfer efficiency and condenser pressure was analyzed under underground ventilation mode,and compared with that under overground ventilation mode.The experimental results show that the underground ventilation mode can greatly improve the heat exchanger efficiency of condenser,and make the condenser pressure maintain at low and stable state,which can ensure the safe and economic operation of units.

关 键 词：直接空冷机组 地下进风 空气流场 环境风 数值模拟 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]