Factors Analysis of Environmental Effect of Natural Draft Cooling Towers in Burning Coal Plant
Based on the atmospheric dispersion model and uplifted flue gas of natural draft cooling tower from German VDI3784 and VDI3945 guidelines, the impacts of the parameters of different source emissions and ambient humidity on the gas emission of cooling towers are compared respectively. The results show that the increase of flue gas flow rate will significantly strengthen the dispersion of pollutants in the air. When the flue gas flow rate is lower than 2m.s -1 , the value of FD will be below 0.35 in all 54 meteorological conditions. In this case the cooling tower will act as a point source diffusion. When the flue gas temperature increases from 10 to 40 , the improvement of the environmental impact on the ground is significant. But when the flue gas temperature rises t ℃ ℃ o 50 , It does not meet the S/P model conditions that the value of F ℃ D gradually decreases to less than 0.35 and the surface concentration caused by the gas emission of the cooling tower is much larger. The flue gas humidity and liquid water have a certain influence on the dispersion of pollutants, but the effect is not so significant. The increase of flue gas humidity and liquid water content are not conducive to the dispersion of pollutants and therefore will increase the surface concentration slightly. It has less impact on the surface concentration when ambient humidity varies below 80%. But when the ambient humidity varies over 80%, the increase of humidity will be conducive to the spread of pollutants effectively.
DING Feng XING Kejia
Appraisal Centre for Environmental and Engineering, Ministry of Environmental Protection, Beijing 100012, China
国际会议
2011 International Symposium on Environmental Science and Technology(2011 环境科学与技术国际会议 2011 ISEST)
广东东莞
英文
416-420
2011-06-01（万方平台首次上网日期，不代表论文的发表时间）