关键词: 冷却塔, 烟塔合一, 风洞模拟, 流场, 烟羽卷夹, 烟气扩散

Abstract: Since more and more power plants have moved their chimneys into cooling towers(i.e., gas emission from cooling towers), it is necessary to use wind tunnel to simulate the flow fields inside the cooling tower. In this paper, based on the similarity theory, the main gas diffusion equations are presented; by virtue of wind tunnel experiment, the flow field and gas density in the integrated cooling tower and chimney are simulated; to study how the flow fields are affected inside the tower regarding the cases with full shades open, only upstream shades closed and only downstream shades closed at different environmental wind velocities. The flow field style and the moving direction and volume of the flue gas are then obtained, and it is figured out that the flue gas density on the tower wall is much lower than that on the chimney wall. In addition, the emerging conditions and ranges of going-through wind are studied with some preventive actions being simulated. Finally, the measured results of a power plant are compared with the simulation results, which exhibits very close similarity. This simulation proves that the gas diffusion equations describing the flue gas in the cooling tower are tenable.

Key words: cooling tower, gas emission from cooling tower, wind tunnel simulation, flow field, gas plume involvement, gas diffusion