烟塔合一间接空冷塔腐蚀环境的数值模拟

Numerical Simulation of Corrosion Environment of Indirect Air Cooling Tower with Flue Gas Injection

利用CFD方法研究了环境风速和塔内烟囱高度对2×350 MW机组烟塔合一间接空冷塔烟气扩散情况和内壁面压力分布的影响。结果表明:随着环境风速的增加,空冷塔内外壁面喉部以上区域逐渐出现了烟气冲刷现象;空冷塔内外壁面SO_2气体最大质量浓度随着环境风速的增加呈现先增加后小幅下降的规律,环境风速16 m/s时空冷塔内外壁面SO_2气体最大质量浓度分别是环境风速4 m/s时的179和226倍;空冷塔运行时内壁面正压区域集中在空冷塔出口处;空冷塔内外壁面SO_2气体最大质量浓度随着塔内烟囱高度的增加而降低。

The effects of ambient wind speed and chimney height on the flue gas diffusion and inner wall pressure distribution of the indirect air cooling tower with flue gas injection of a 2×350 MW unit were studied by means of computational fluid dynamics. It was found that the smoke scouring phenomenon gradually appeared in the area above the throat of the inner and outer wall of the indirect air cooling tower with the increase of the ambient wind speed;The maximum mass concentration of SO2 gas in the inner and outer wall of the indirect air cooling tower was seen to increase firstly and then decline with the increase of the ambient wind speed, the maximum mass concentration of SO2 gas in the inner and outer wall of the indirect air cooling tower at an ambient wind speed of 16 m/s was 179 and 226 times that of the ambient wind speed of 4 m/s, respectively;When the indirect air cooling tower was running, the positive pressure area of the inner wall was concentrated at the exit of the indirect air cooling tower;The maximum mass concentration of SO2 gas in the inner and outer wall of the indirect air cooling tower was seen to decrease with the increase of the chimney height in the tower.