关键词: 冷却塔, 烟气抬升最大高度, S/P模式, 敏感性试验

Abstract: The S/P model from German VDI3784 is a three-dimensional liquid dynamic integral model. Mass and momentum of infinitesimal element, mass concentration of static pollutant and energy balance were described. The sensitivity of uplifted height of flue gas from cooling tower was tested by the S/P model under different parameters and atmospheric conditions. The results indicate that wind speed, air temperature and humidity could influence the uplifted height of flue gas, especially wind speed and air temperature. Under the stabilization of “D” type, the uplifted height changes from 711.7 m to 38.5 m when wind speed increases from 0.1 m/s to 15.0 m/s. In addition, the uplifted height diminishes distinctly with rising of environmental temperature. Under the stabilization of “A” type, the uplifted height reduces from 688.9 m to 45.1 m when environmental temperature increases from 10 ℃ to 40 ℃, and it decreases more than 14 times. However, the effect of environmental humidity on the uplifted height is not significant. Under the stabilization of “E” and “F” types, the uplifted heights decrease from 115.3 m and 84.6 m to 112.9 m and 81.7 m respectively when environmental humidity increases from 20% to 70%, and both decrease 3.43% and 2.08%. On the other hand, the diameter of cooling tower, gas speed and mix gas temperature at the exit could also influence the uplifted height of flue gas, especially mix gas temperature. Under the various stabilization conditions, the uplifted height of flue gas increases 1.2-13.3 times, 0.63-1.40 times and 0.24-0.74 times when mix gas temperature at the exit changes from 20 ℃ to 90 ℃, the diameter of cooling tower from 30 m to 90 m and gas speed at the exit from 2.5 m/s to 8 m/s, respectively.

Key words: Cooling tower, The maximum height of plume rise, S/P model, Sensitivity test