摘要
阐述了热风回流的产生机理及热回流率的概念,并对汽轮机空冷系统周围不同环境风场进行了数值模拟.通过对计算结果的分析,找出了空冷系统的不利风向,给出了热回流率随风速的变化规律,并提出了减少热风回流的措施:适当增加空冷平台上部四周风墙高度,或加快空冷平台边缘风机的转速.
The mechanism of the generation for hot air recirculation and its conception was expounded. The environmental wind fields with different conditions around direct air cooled system of a steam turbine were numerically simulated. The unfavorable wind to the air cooled system was found out and the regulation of hot wind recirculation ratio varied with the wind velocity was presented by analyzing the calculations. Three measures are developed to reduce the hot air recirculation, such as to increase the upper wind-wall height around air cooled platform, to accelerate the rotating speed of the fans near the edge of the air cooled platform, and etc..
出处
《动力工程》
EI
CSCD
北大核心
2008年第3期395-399,共5页
Power Engineering
关键词
能源与动力工程
汽轮机
直接空冷系统
热回流率
空冷凝汽器
汽轮机背压
energy and power engineering
steam turbine
direct air cooled system
thermal reeireulation ratio
air cooled condenser
steam turbine＇s back pressure
