火电厂汽轮机房局部机械通风数值模拟及优化  

Numerical simulation and optimization on local mechanical ventilation in steam turbine room of thermal power plant

作　　者：张弘[1] 黄亚继[1] 盛帮明 陆云 刘明涛 王靓[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096 [2]中国能建江苏省电力设计院有限公司,江苏南京211102

出　　处：《中南大学学报（自然科学版）》2017年第6期1659-1666,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(11190015)~~

摘　　要：为了改善汽轮机房通风效果,保障人员舒适工作和设备安全运行,通过数值模拟研究江苏某2×1 000 MW机组汽轮机房内空气温度场和速度场的分布情况并验证模拟结果准确性,引入新型局部机械通风进行优化改进,研究机械通风流量及角度对温度场的影响。研究结果表明:当底层通风流量达6 m3/s、运转层通风流量达10 m3/s以上时,可以将人员主要活动区温度降至设计要求范围内;对于底层通风口,通风角度在0°~10°范围内,机械通风会将厂房内热空气排挤向自然进风口附近,抑制底层自然进风,该情况在实际工程中需要避免;当角度大于20°时抑制作用消失,但通风角度过大会使得厂房东侧温度升高,综合考虑通风角度选择20°较为合理。In order to improve the ventilation effect and guarantee the comfort of staffs and the security of equipments, numerical simulation was employed to research the distribution of temperature and velocity field of the air in one of the 2×1 000 MW power unit steam turbine room and the accuracy of simulation results were verified. The new local mechanical ventilation was introduced into optimization. The effect of changing mechanical ventilation flow rate and degree on temperature field was studied. The results show that the temperature of operation region can be reduced to the requirement when the ventilation flow rates are more than 6 m^3/s and 10 m^3/s respectively in the ground floor and operation floor. The situation should be avoided because mechanical ventilation would restrain natural ventilation by pushing the hot air towards the entrance when the ventilation degree is 0°-10°. When the degree is larger than 20°, the restrain effect disappears but the temperature rises in the east area, and so the ventilation degree should be set at 20°.

关 键 词：汽轮机房 数值模拟 局部机械通风 优化改进 

分 类 号：TK284.8[动力工程及工程热物理—动力机械及工程]