660MW SCAL型间接空冷塔夏季安全运行改造方案研究  

Retrofit Schemes for Safety Operation of a 660MW SCAL Indirect Dry Cooling Tower During Summer Period

作　　者：王蓝婧[1] 刘康[2] 付文锋[2] 李卫华[2] 李姗 

机构地区：[1]华北电力大学控制与计算机工程学院,河北保定071003 [2]华北电力大学电站设备状态监测与控制教育部重点实验室,河北保定071003

出　　处：《动力工程学报》2018年第1期55-61,68,共8页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51606066);中央高校基本科研业务费专项资金资助项目(2014MS135;2017MS117)

摘　　要：利用Fluent软件中的多孔介质模型,分析了夏季环境风对空冷塔流动传热性能的影响,得到空冷塔流动传热性能最差时的环境风速.针对此环境风速下的空冷塔流场分布特点,在考虑周围厂房影响的基础上装设翅墙,对空冷塔进行安全运行改造,保障机组安全稳定运行.结果表明:当环境风速为12m/s时,空冷塔的流动传热性能最差;考虑厂房的影响后,空冷塔的通风质量流量和换热量沿周向分布的不均匀性进一步增大,其流动传热性能变差;加装翅墙后,空冷塔的穿堂风质量流量减少26.57%,通风质量流量和换热量分别增加24.55%和13.01%.The effects of cross wind speed in summer on the flow and heat transfer performance of an indi- rect dry cooling tower were analyzed by using the porous medium model of Fluent software, so as to find the environmental wind speed corresponding to the poorest heat transfer performance, and to retrofit the cooling tower for safety operation of the unit, in the way of adding wing walls outside the tower by consid- ering the effects of factory buildings, based on the f[ow field characteristics at the wind speed. Results show that the cooling tower has the worst heat transfer performance when the cross wind speed is 12 m/s; considering the effects of factory buildings, the distribution uniformity of both the ventilation rate and the heat exchange rate is found to drop along the circumferential direction, resulting in worsened flow and heat transfer performance of the tower. After adding wing walls, the ventilation rate of draught air has been re duced by 26.57%, while the ventilation rate and heat transfer flux of the indirect dry cooling tower have been increased by 24. 55% and 13.01%, respectively.

关 键 词：间接空冷塔 环境风 厂房 翅墙 流动传热性能 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]