加高挡风墙对直接空冷系统流场的影响  

Effect of heightening windbreak on flow field of a direct air coolling system

作　　者：王玲花[1] 张杨[1] 黄鑫[2] 

机构地区：[1]华北水利水电大学电力学院,河南郑州450000 [2]四川省紫坪铺开发有限责任公司,四川成都610000

出　　处：《热力发电》2016年第11期88-92,共5页Thermal Power Generation

基　　金：河南省高等学校重点科研计划项目(16B570003);华北水利水电大学研究生教育创新计划基金(YK2015-06)

摘　　要：采用Fluent软件对某火电厂2×1000MW机组直接空冷系统流场进行数值模拟,在来流风速为7m/s、风向角为0°、环境温度为30℃的条件下,计算加高挡风墙对空冷岛温度场、热态流场和热回流率的影响.结果表明：适当增加挡风墙高度,可使空冷岛底部高温区域明显减少,热回流率降低;综合考虑增加挡风墙高度对直接空冷系统流场的影响以及建筑材料成本,挡风墙在原有设计值的基础上以增加2-3m为宜.The Fluent software was applied to simulate the flow field of direct air-cooled system in 2 × 1 000 MW unit. Moreover,the effects of heightening the windbreak on such parameters as the temperature field,hot flow field and thermal recirculation rate of the air cooling island were investigated, under conditions with facing velocity of 7 m/s,wind direction of 0° and ambient temperature of 30 ℃. The results show that, appropriately heightening the windbreak can obviously reduce the high-temperature regions in the end portion of the air cooling island. Comprehensively considering the effects of heightening the windbreak on the flow field of the direct air-cooled system, as well as the building material cost, increasing the windbreak height by 2-3 m is suitable.

关 键 词：火电厂 直接空冷系统 1000MW机组 挡风墙 温度场 热态流场 热回流率 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]