火电厂周围大气环境中硫化物分布规律的探讨

由于电厂排放的污染物量大且浓度高，对周围环境影响很大。选取山西省太原第一热电厂排放的SO2作为研究对象，针对该电厂排放的SO2传输特性和空间分布规律，在电厂周围按照不同的距离进行优化布点，测定SO2及PM10中硫化物的量。SO2和PM10中硫化物的量在空间上随着距离的增大，浓度也变高，直至出现浓度最大点，然后再随着距离的加大，浓度却随之减小，并且在距离大约2 000 m处取得最大值。这与用ADMS预测的结果吻合。该结果符合电厂高架源排放污染物在下风向的浓度变化规律，说明这些硫化物浓度变化主要是由电厂引起的。在有风雨情况下，SO2和PM10中硫化物的降幅都在10%以上，雨量和风速的大小对PM10中硫化物的影响比起二氧化硫的更大。

Investigation of distribution rule of sulfide locatted in ambient thermal power plant

In general, thermal power generation has a significant effect on the surrounding environment because of the large amount of pollutant emissions with high concentrations. The first power plant in Taiyuan, Shanxi, was selected for this study, and the transmission characteristics and spatial distribution of SO2 emissions were investigated. The monitoring point was set carefully, according to the transmission characteristics and the distribution rules of various distances, for measuring the SO2content in the atmosphere and the sulfide concentration in PM10. It was concluded that the concentration of sulfur dioxide and the sulfide concentration in PM10 initially increased with distance. Subsequently the concentration value increased until the maximum concentration occurred at a distance of approximately 2 000 m, and, finally, the concentration decreased with increasing distance. This conclusion was consistent with the evaluation results by ADMS. The pollutant concentration of the emission from the power plant changed in the downwind direction, and the pollutant concentration was mainly caused by the power plant. In instances of wind and rain, the SO2 and the sulfide concentration in PM10 declined more than 10%. The effect of rainfall and wind on the sulfide in PM10 was greater than was that of sulfur dioxide.