烟塔合一的环境影响实证研究

An Empirical Study on Environmental Impact of the Integration of the Natural Draft Cooling Tower and the Flue Gas

为跟踪了解烟塔合一对区域大气环境和理论下洗区污染物浓度的影响,分别于采暖期和非采暖期在华能陕西秦岭电厂周边400 km^2范围内对SO_2和NO_2进行连续15天采样分析,在电厂排烟冷却塔理论下洗区域内布置环境空气自动站进行一年以上逐时监测,并结合气象资料对烟塔合一的环境影响进行实证研究。结果表明:采暖期和非采暖期SO_2、NO_2环境空气质量监测结果均满足《环境空气质量标准》(GB3095—2012)的要求,电厂对区域环境的影响可以接受;环境空气自动站长时间连续监测期间未观测到因烟气下洗而产生的局部污染物浓度高的现象,主导风向西风条件下理论下洗区内的污染物浓度与东风时无显著差异(P>0.05),西风条件下大风时的污染物浓度水平显著低于小风时的浓度(P<0.01),监测结果表明烟塔合一模式下理论下洗区域不会出现地面污染物浓度高的问题。

In order to track the influences of the natural draft cooling tower(NDCT)with flue gas injection on the regional atmospheric environment and pollutant concentrations in the theoretical plume-downwash area,SO2 and NO2 in the area of 400 km2 around the Qinling power plant are sampled and analyzed during the heating and non-heating periods,an automatic air quality monitoring station is set to get hourly observations in the theoretical plume downwash area of the NDCT over a year,and combined with meteorological data,an empirical study on the environmental impact of NDCT with flue gas injection is carried out.The results show that the monitoring results of the ambient air quality in both heating period and non-heating period meet the requirements of“the ambient air quality standard”(GB 3095-2012),and the influence of the power plant on the regional environment is acceptable.During the continuous monitoring of the ambient air over time,high concentration of local pollutants resulting from flue gas downwash is not observed.There is no significant difference(P>0.05)between the pollutant concentration in the theoretical washing area when the dominant wind is westward or eastward.The pollutant concentration in the strong wind is significantly lower than that in the low wind(P<0.01)when the wind is westward.The monitoring results show that high concentration of ground pollutants will not happen in the theoretical plume-downwash area of NDCT with flue gas injection.