Characteristic study on flue gas of a “three-in-one” indirect air cooling tower

Abstract

Different unit loads affect the flow heat transfer characteristics and flue gas diffusion of a “three-in-one” indirect air-cooling system. A numerical study is carried out on the tower of a 1 000 MW unit. The results show that as the load increases， the extraction effect and ventilation capacity of the tower at 100% load are 1.47 and 1.3 times higher than those at 50% load， respectively. Moreover， the cooling capacity of the tower is larger at higher loads. Load increase can reduce the concentration of SO2 on the inner wall of the air-cooling tower and raise the lift height of flue gas. At 100% load， the SO2 concentration is reduced by 4.55 mg/m3， and the maximum flue gas diffusion height is raised by up to 16.72 m compared to 50% load.

Keywords

• numerical simulation
• variable load
• flue gas diffusion
• “three-in-one” tower
• indirect air-cooling tower