基于CFD方法研究了环境风速对某2×350 MW机组三塔合一间接空冷塔（塔内布置两座脱硫排烟装置）空冷三角散热量和烟气扩散的影响。结果表明：空冷塔内布置脱硫排烟装置对空冷塔的进风量和空冷三角散热量的影响可忽略不计；随着环境风速的增大，两台机组运行时三塔合一和常规间接空冷塔（塔内无脱硫排烟装置）的进风量和空冷三角散热量呈现先减小后基本不变的规律，一台机组运行时三塔合一和常规间接空冷塔的进风量和空冷三角散热量呈现先减小后增加的规律；对于烟气扩散，随着环境风速的增大，SO2气体的最低扩散高度呈现先降低后基本不变的规律，SO2气体的扩散距离呈现逐渐减小的规律，且两台机组运行时SO2气体的扩散距离明显大于一台机组。

The influence of ambient wind speed on the heat transfer flux and flue gas diffusion of an indirect air cooling tower with three incorporate towers (two desulfurization and flue gas exhausting devices are installed in the tower) of a 2×350 MW unit was studied by means of computational fluid dynamics.It is found that the effect of exhausting flue gas from the desulfurization and smoke exhausting devices in the tower on the ventilation rate of the air cooling tower and the heat transfer flux of the air cooling triangle is negligible.With the increase of the ambient wind speed,when two units are running,the ventilation rate and the heat transfer flux of both the indirect air cooling tower with three incorporate towers and the conventional indirect air cooling tower (no desulfurization and flue gas exhausting device in the tower) are found to reduce firstly and then remain nearly constant.When a single unit is running,the ventilation rate and the heat transfer flux of both the indirect air cooling tower with three incorporate towers and the conventional indirect air cooling tower are firstly reduce and then increase with the ambient wind speed.For flue gas diffusion,the minimum diffusion height of the SO2 gas is seen to decrease firstly and then remain nearly invariant,while the diffusion distance decreases gradually with the increase of the ambient wind speed.When two units are running,the diffusion distance of the SO2 gas is significantly longer than that of a single unit.

TK264.1，X511

浙江省重大科技项目（2017C01082）