烟塔合一项目烟气抬升影响因素分析

Factors Analysis of Gas Lift Height from Cooling Tower

以德国空气清洁标准(VDI3784标准)所规定的冷却塔排烟抬升高度的计算方法(S/P模式)为基础,分别针对气象参数及源排放参数对烟塔合一项目烟气抬升高度的影响进行比较分析。气象参数中大气稳定度的变化对烟气抬升的平均影响大于环境风速的影响。随着稳定度从强不稳定(A类)到强稳定(F类)变化,烟气抬升高度呈逐渐降低趋势,平均抬升高度极差764m。而随着环境风速从小静风(1m/s)向大风(20m/s)变化,烟气平均抬升高度降低509m。不同源排放参数的变化对烟气最大抬升高度的影响很小,在特定气象条件下烟气最大抬升高度均可能达到理论最大值。但源排放参数对烟气在全部气象条件下的平均抬升高度及最小抬升高度的影响较为明显,其中影响最大的参数为烟气温度和烟气流速,平均极差为418和213m,而烟气相对湿度和液态水含量的变化对烟气平均抬升高度影响较小。

Based on the atmospheric dispersion model from VDI3784 guidelines of Germany,the influencing factors of plume rising height from Cooling Tower according to the meteorological and source emission parameters were analyzed.The results showed that compared to the wind speed,atmospheric stability had more important influence on the plume rising height.With the stability changing from strong unstabitily（A class）to strong stabitily（F class）,the plume rising height gradually decreased,and the average range was 764 meters.With the wind speed changing from small calm wind（1 m/s）to the strong wind（20 m/s）,the average plume rising height reduced 509 meters.The different source parameters＇ effect on the maximum rising height was very small,and the rising height was likely to reach the maximum in certain weather conditions.But the effects of source emission parameters on the average rising height and minimum height were more obvious.The most influential parameters were temperature and gas flow rate,and the average range was 418 meters and 213 meters,respectively.But the variation effect of relative humidity and liquid water content in the flue gas on the average rising height was not significant.