Study On The Distribution Characteristics Of Various Sulfides Around The Thermal Power Plants

With rapid economic growth, the problem of air pollution is growing to be concerned, thermal power plants are the major emitters of air pollution.The pollutants emitted from plants have a major impact on the surrounding environment, in order to improve air quality from the source,exploring various surrounding sulfides which affected by plants,it has a very important significance for the improvement of local atmospheric environment and reduce air pollution.The first power plant in Taiyuan, Shanxi was selected for the study, the transmission characteristics and spatial distribution of emissions SO2were studied. According to different distances the content of SO2had been measured, at the same time, the sample of water, soil and plant also had been collected for analysis. The No.0as a reference point away from the power plant was200m, No.3,7and10from the power plant were500m,1km,2km and4km in summer and autumn.The No.0as a reference point away from the power plant was500m, No. land2from the power plant were lkm and2km in winter.The conclusions are as follows:(1) Regional spatial distribution of sulfide. Surrounding the plant SO2, particulate matter PM10and sulfide concentration of plants, soil and water that distributed in space with the increasing distance, its concentration also will become higher, until the maximum point concentration, and then with increasing distance, the concentration decreases, and get the maximum value at about2000m distance.This conform with the emission pollutant from power plant elevated source of changes in downwind direction, indicating that these changes in the concentration of sulfide was mainly caused by the power plant.(2) Seasonal effects on the sulfide concentration.Sulfide concentration of sulfur dioxide and PM10, plants, soil and water of the No.1was about1.13times than the No.0, the concentration of the No.3was1.73times than No.0.The maximum concentration was present in the No.7, about3.03times than No.0, the concentration of No.10was smaller, was2.68times than No.0in summer and autumn.The sulfur dioxide concentration of No.1and No.2were2.03and3.35times than the No.0in winter.Description that the sulfur dioxide concentration in winter had a larger change than in summer and autumn;The ratio of PM10and sulphide concentration and value of the reference point was quite to monitored sulfur dioxide. PM10and sulfate concentration of No.2reached a historical maximum in winter, were322.40ug/m3and107.29ug/m3,the concentration of No.1and No.2were1.38and1.67times than the No. O.Description that PM10and sulphide concentration in winter had a less change than in summer and autumn;The ratio of sulphide concentration of plant and value of the reference point was quite to monitored sulfur dioxide.The concentration of No.1and No.2were1.38and1.67times than the No.0in winter. Description that sulphide concentration of plant in winter had a less change than in summer and autumn;The ratio of sulphide concentration of soil and value of the reference point was quite to monitored sulfur dioxide. The concentration of No.1and No.2were1.36and2.08times than the No.0in winter. Description that sulphide concentration of soil in winter had a less change than in summer and autumn,not bigger than the change of sulfur dioxide;The ratio of sulphide concentration of water and value of the reference point was quite to monitored sulfur dioxide.The concentration of No.1and No.2were1.3and1.65times than the No.0in winter. Description that sulphide concentration of water in winter had a less change than in summer and autumn,not bigger than sulfur dioxide;(3) The impact of weather on the sulfide concentration.In autumn, SO2concentration of No.7appeared at the minimum was in cloudy and windy conditions, reached92.58ug/m3, compared to the average,reduced by approximately20%.In winter, there was a minimum value in windy conditions of No.2, reached292ug/m3, compared to the average of312ug/m3reduced by approximately5%. Description that the weather conditions had a greater impact on SO2concentration of power plant emissions in autumn;In the fall,sulfate concentration of No.7appeared at the minimum was in cloudy and windy conditions, reached51.8ug/m3, compared to the general average of75.8ug/m3,reduced5%.In winter, there was a minimum value in windy conditions of No.2,reached82.5ug/m3, compared to the average of107.3ug/m3reduced5%. Description that the weather conditions had a greater impact on sulfate concentration in autumn and winter than in summer;In the fall, the average of the sulfate concentration of No.7in plants was27198mg/kg, was quite to the average in fall.The sulfate concentration of No.2was similar to the average.Weather had not impact on the sulfide concentration in the plants;In rainy weather, the sulfate concentration of soil was similar to the average in the fall.The sulfate concentration of No.2was similar to the average in winter, indicating that weather basically had not impact on the sulfide concentration in the soil;From the measured values of the No.7, the minimum of total sulfate concentration in the water was present in rainy weather,the minimum sulfate concentration was122mg/kg,compared to the average of125mg/kg reduced by about3mg/kg,reduced5%. As compared sulfate concentration decreased by2%in winter, indicated the factor of weather had bigger impact to the sulfide concentration of water in autumn than in winter.