三塔合一系统内机械通风布置方式对烟气扩散影响的数值研究

借助计算流体力学方法建立三塔合一系统间接空冷塔模型，分析在空冷塔散热器内侧和外侧分别布置风机后对机组烟气抬升和扩散的影响。结果表明：空冷塔散热器内侧布置风机会增大塔内气流扰动，使塔内烟气扩散区域增大，同时使烟气扩散后的下落点位置前移，低风速下导致机组经济性下降；散热器外侧布置风机能够减小塔内烟气扩散面积，增大烟气下落点与塔中心的距离，机组供电煤耗降幅与环境风速成正比，最高达到3.1 g/(kW〖DK〗?h)。

Numerical Study on the Effect of Mechanical Ventilation Arrangement on Flue Gas Diffusion in Three Incorporate Tower System

The influence on the flue gas lift and diffusion of the unit after fans were arranged inside and outside the radiator of the dry cooling tower was analyzed by using the indirect dry cooling tower model of the three incorporate towers system established by the computational fluid dynamics (CFD) method. Results show that the arrangement of fans inside the radiator of the dry cooling tower will increase the airflow disturbance and the area of flue gas diffusion in the tower, meanwhile, move the location of the drop point of the flue gas diffused forward, which leads to economy decline of unit at low wind speeds; arranging fans outside the radiator can reduce the area of flue gas diffusion in the tower and increase the distance between the drop point of flue gas and the center of the tower. The reduction of coal consumption for power supply of the unit is proportional to the ambient wind speed, up to 3.1 g/kWh.