“三塔合一”空冷塔的流动特性数值研究  

Numerical Analysis on Flow Characteristics of“Three Towers in One”Air Cooling Tower

作　　者：王国峰 宫元娟[1] 任德志 金钊 白雪卫[1] WANG Guofeng;GONG Yuanjuan;REN Dezhi;JIN Zhao;BAI Xuewei(Agricultural Engineering College,Shenyang Agricultural University,Shenyang 110136,Liaoning Province,China)

机构地区：[1]沈阳农业大学工程学院,辽宁省沈阳市110136

出　　处：《中国电机工程学报》2021年第24期8494-8501,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51405311)。

摘　　要：为了探索一种合理的数值计算方法,解决"三塔合一"空冷塔的塔内、外气体流动,空气与散热器换热,塔内、外烟气扩散的联合仿真问题,采用商业软件Fluent,运用通用的可压缩理想气体模型,用源项方程,解决环境风和海拔高度引起的烟气流动;用多孔介质模型,解决散热器换热问题;用组分输运方程,解决烟气扩散问题;并进一步分析了烟羽抬升高度、污染物扩散以及塔的自然抽吸力等主要性能参数对塔的影响。结果表明:环境风、环境温度和散热器温度影响空冷塔进口空气流量和烟羽抬升高度。当环境风速5m/s时,环境温度0℃(冬季),散热器温度37.58℃时,烟羽横向飘移227m,散热器进口空气流量48097kg/s;环境温度及散热器温度差别越大,烟羽抬升高度越高;侧向风速影响烟羽抬升高度,风速越高,烟羽横向扩散增加,抬升高度降低。通过使用通用数值方法及UDF二次开发,为自然对流空冷塔的进一步研究提供参考。In order to explore a reasonable numerical calculation method and solve the dry cooling tower air flow,air heat transfer and smoke diffusion problems.In this paper,the commercial software Fluent was used to solve the problem of natural convection flow of air affected by ambient wind and altitude.The heat transfer problem of radiator was solved by using porous medium model,and the smoke diffusion problem was solved by using component transport equation.Then the influence of main performance parameters such as plume rise height,pollutant diffusion and natural suction of the tower was analyzed.The results show that when the ambient air velocity is 5 m/s,the ambient temperature is 0℃in winter and the temperature of the radiator is 37.58℃,the smoke plume moves227 m laterally and the air flow rate at the inlet of the radiator is48097 kg/s.The rising height of smoke plume is inversely proportional to the difference of ambient temperature and radiator temperature.The increase of the wind speed in the lateral environment leads to the increase of the lateral diffusion distance of the plume.Through the use of general numerical methods and UDF secondary development,for the natural convection dry cooling tower to provide a reference for further research.

关 键 词：三塔合一 自然对流 烟羽抬升高度 污染物扩散 抽吸力 

分 类 号：TK124[动力工程及工程热物理—工程热物理]