| Coal-fired Power plants, industrial boilers and motor vehicles are important sources of atmospheric pollutants emission in China, it can effectively reduce the total pollutants emission and improve air quality to strengthen their emission control policies. At present, the new emission standards of power plant has reached international leading level, and the related research of industrial boilers and motor vehicles emission control have been carried on.Considering the current requirements of industrial boiler and vehicle emission control, four kinds of schemes and eight scenarios were designed on the basis of research of the emission standards of power plants. We used the integrated air quality mode (CMAQ) to simulate the environmental impact of the implementation of the three new emissions standards:power plants, industrial boilers and motor vehicles standards. And the effect of implementation of the new emission standards were analyzed, furthermore the control levels of the new emission standards were evaluated and recommendations for the revision of standards were also discussed.An emission inventory of power plants, industrial boilers and motor vehicles in our country was established based on the research of the atmospheric pollutants of our country at home and abroad as well as the preparation instructions of related emission standards. And the chemical species allocation, temporal allocation and spatial allocation of the inventory were developed. For power point source, the whole country was divided into eight regions, according to the national economic development and coal energy consumption. And we calculated the growth of thermal power unit in every region for nearly10years, from which the total growth of thermal power unit in every region were extrapolated to2015and2020, and estimated the pollutant emission. Spatial allocation of power plants emission inventory was developed according to thermal power unit and emission limits of power plants. For industrial boilers, spatial allocation was developed according to provincial industrial boiler coal consumption and the proportion of population of cities in the same province. Finally, a gridded emission inventory that CMAQ needed was generated.The results showed that it could effectively reduce the deterioration trend of regional air quality through implementation of the current emission standards of power plants. By2020, the area of NO2concentration higher than40ug/m3reaches3.384×105km2and average concentration of11major cities reaches41.1μg/m3, reducing by55.24%and22.63%compared with that of the previous standard; By2020, the area of SO2concentration higher than60μg/m3reaches1.08×104km2and average concentration of11major cities reaches24.05μg/m3, reducing by40%and41.64%compared with that of the previous standard; By2020, the area of PM2.5concentration higher than35μg/m3reaches8.064×105km2and average concentration of11major cities reaches38.6μg/m3, reducing by11.5%and7%compared with that of the previous standard. By2020, the area of nitrogen deposition higher than1.0gN/m2·a and sulfur deposition higher than1.6gS/m2·a reaches5.04×105and4.68×105km2, reducing by81.8%and34.3%compared with that of the previous standard. From this study, we can conclude that it is quite obvious that the regional air quality will improve a lot through implementation of the current emission standards of power plants.Implementation of the new emission standards of industrial boiler and Motor vehicle could further improve regional air quality, but by2020, pollution situation of NOx and PM2.5in China is still serious due to the increase in the number of motor vehicles and the Primary Particulate Matter emission of civilian sector and industrial processes. Meanwhile, in some megapolis where vehicle emissions dominated, such as Beijing and Shanghai etc.., the situation of air pollution did not get fundamental improvement, and the area of PM2.5concentration higher than Standard limit is still large.In order to reduce NOx and PM2.5pollution situation of regions and megapolis, it is necessary to strengthen the emission controls of pollutants from industrial boiler and motor vehicles as well as civilian sector and industrial processes. This will also be the keypoint of the future NOx and PM2.5control in our country. |
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