摘要
以某2×300MW空冷机组空冷岛扩容为例,通过CFD模拟,获得了空冷岛增列前后的冷却空气流场、温度场,计算得到了不同气温、风速、风向条件下,空冷岛迎面风速、进口空气温度和机组背压的变化规律。结果表明:空冷岛增列扩容后,冷却空气流场、温度场变化不大。空冷系统运行特性的改善,主要依赖于空冷岛扩容后传热面积和冷却空气流量的增加。空冷岛扩容,可显著降低机组运行背压,提高机组运行的经济性,对于电站直接空冷系统的技术改造具有一定的指导作用。
Based on the expansion of a typical 2 × 300MW air-cooled system, the velocity and temperature fields of the cooling air in the air-cooled condenser system before and after the expansion of the system are obtained by using CFD simulation. The variation of the windward air velocity, the inlet air temperature and the turbine back pressure with dif- ferent ambient temperatures, wind speeds and directions are calculated. It shows that the flow and temperature fields change little after the expansion of air-cooled condensers. The operational performance improvement mainly depends on heat transfer area and cooling air flow rate increase due to the expansion of the air-cooled condenser system. The turbine back pressure can be decreased and the operational economy of the unit can be increased by the air-cooled condenser expansion. It is useful to investigate the operational performance of direct air-cooled system after the expansion of air-cooled condensers for the capability improvement of air-cooled system in power plant.
出处
《现代电力》
2009年第2期42-46,共5页
Modern Electric Power
基金
国家重点基础研究发展计划项目(2009CB219804)
关键词
空冷凝汽器
运行特性
空冷岛扩容
背压
CFD
air-cooled condenser
operational performance
expansion of air-cooled condenser
back pressure
CFD
