非稳态排放源大气环境防护区域设立方法研究

Research Progress on the Establishment Method of Atmospheric Protection Zone forUnsteady Emission Sources

常规大气环境防护区域采用恒定源强进行计算,现实中有些生产装置其排污随时段发生明显变化。为选择典型的源强精确计算,以SiC生产线为例。通过CALPUFF模拟,反推H2S源强发现SiC生产过程呈现高、中、低水平周期性排放。利用均值聚类法核算出各时段源强以及平均源强。再计算各情景防护区域,选择出代表性的源强。结果显示:高、中、低水平排放源强是平均源强的3.15,1.31,0.71倍。平均源强与中、低水平排放源强的超标范围分布相近,但高水平排污时段,超标范围分布发生显著的变化。高水平排污时段制定的防护区域面积分别是中、低、平均情景下计算结果的4.41,16.61,8.17倍。对于非稳态排放源,选择高水平排放源强模拟对精准计算大气环境防护区域更准确。

The conventional atmospheric protection area is calculated by using the constant source strength.In order to select a typical accurate source strength calculation,this paper takes SiC production line as an example.Through CALPUFF simulation,the H2S source strength was deduced back and it was found that the SiC production process presented high,medium and low level periodic emissions.The mean clustering method is used to calculate the source strength and the average source strength of each period.Then calculate each scene protection area and select the representative source strength.The results show that the intensity of high,medium and low emission sources is 3.15,1.31 and 0.71 times higher than the average intensity.The average source strength was similar to that of medium and low level emission sources,but the distribution of the exceeding range changed significantly during the period of high level discharge.The area of the protection area during the period of high level sewage discharge was 4.41,16.61 and 8.17 times of the calculated results under medium,low and average scenarios.For unsteady emission sources,high level emission source strong simulation is selected to accurately calculate the protection area of atmospheric environment.