基于CFD与灰色关联度的直接空冷机组背压运行方式研究  

Research on the Operating Method of Back Pressure of Direct Air-cooled Unit Based on CFD and Grey Correlation

作　　者：李健[1] 白焰[1] 李博 万旭东 张超 

机构地区：[1]华北电力大学控制与计算机工程学院,北京市昌平区102206 [2]国网冀北电力有限公司经济技术研究院,北京市海淀区100073 [3]国网天津市电力公司检修公司,天津市河北区300000 [4]国网天津市电力公司电力科学研究院,天津市西青区300384

出　　处：《中国电机工程学报》2017年第17期5049-5057,共9页Proceedings of the CSEE

基　　金：中央高校基本科研业务费专项资金(2016XS41)~~

摘　　要：针对环境风作用下的直接空冷机组,受热风回流和轴流风机群的群抽效应的耦合作用,使得风机的冷却能力在不同区域发生不同变化,导致传统的背压控制策略耗电量增大,能效下降。现通过计算流体力学(computational fluid dynamics,CFD)方法,获得轴流风机群阵列布局下空气流场和温度场,计算得到不同风机转速下机组背压的变化情况,提出采用灰色差分微增量关联度方法,分析空冷岛风机群转速调节对机组背压影响的关联程度,并从单个空冷单元工作效率角度考虑调压问题。研究表明,并不是风机通风量越大,空冷单元翅片管束的换热效率越高,合理发挥高效空冷单元的作用,能够有效改善空冷岛的能效,达到节能目的,为深入研究空冷岛轴流风机控制提供理论和试验基础。In view of the direct air-cooled power generating unit under the action of the environment wind, fan cooling capacity of the air-cooled condenser （ACC） would vary differently in different areas, when influenced by the exhaust recirculation and the coupling effects of axial fan cluster pumping. This variation would lead to higher power consumption and lower energy efficiency for the traditional back-pressure control strategy. Through the use of the computational fluid dynamics （CFD） method, the air flow field and temperature field of the axial flow fan cluster array could be obtained, and the back pressure of the unit in the different fan speed would be calculated, then the grey differential incremental correlation method was proposed to analyze the influence on the back pressure of the unit when processed the speed regulation of air-cooled island wind turbine generators, and then took the working efficiency of single air cooling cell into consideration when researched the pressure regulation problem. The results show that, larger the fan ventilation rate will not necessarily cause higher the heat transfer efficiency of the finned tube bundle of the air-cooled unit. Rational usage of efficient air-cooled unit can effectively improve the energy efficiency of air cooling island, and achieve the purpose of energy saving. It will also be able to provide theoretical and experimental basis for further research on the control of axial flow fan in air-cooled island.

关 键 词：空冷岛 轴流风机 灰色关联度 背压 数值模拟 

分 类 号：TM85[电气工程—高电压与绝缘技术]