Assessment To The Effect Of Power Layout Optimization Based On The Source Appointment Technology

Coal-dominated energy structure and rural household coal combustion is the main cause of haze pollution, adjusting the unreasonable energy consumption structure and pattern is a key to control haze. As a clean and convenient final energy, how to optimize the regional electricity distribution, and utilize the electric energy to replace direct combustion in a reasonable way play an important role in the prevention and control of atmospheric pollution in China.The long-term air quality for SO2, NOX, PM_2.5, the contributions from different emission sectors, especially the coal-burning power plant, and of regional and seasonal variation of air pollutants were analyzed by using model simulation of Comprehensive Air Quality with extensions（CAMx） model equipped with Particulate Source Apportionment Technology（PSAT） technique. Study on the contribution of power plant emission from different chimney heights to the pollutant concentration and the contributions from different emission sectors and source regions to PM_2.5 over BeijingTianjin-Hebei area during a typical season with heavy pollution frequently happened are explored. The feasibility and potential of using electricity generated by the coalburning power plants to replace the industrial and domestic energy consumptions are explored. Electric energy alternative scenarios are created based on the electrical replacement quantities, and are compared with each other to demonstrate the effectiveness and efficiency in reducing pollutant concentration. The results are as follows:（1） Point-source distribution and pollutant emission of the power plant is mainly concentrated in the east China, especially in Shandong Province, the Yangtze River Delta, Pearl River Delta and other areas; the industry, domestic and vehicle emissions which is accounted for about 60%-90% of the total emission and is larger than power plant emission. The regional contribution with low anthropogenic emissions is greater than that region with high anthropogenic emissions. The contribution concentration change trend of power plant emission to the regional pollutants was high in winter and autumn, but low in the spring and summer, the proportion of the total concentration by seasonal fluctuations was not significant.（2） The contribution of power plant emissions to PM_2.5 concentration is very low in Beijing, Shanghai, and is accounted for about 7% of the total PM_2.5 concentration. The contribution by industrial and residential sectors emissions is greater than that from the power plant, the ratio of the concentration contribution by that sector to the total concentration is more than 75% in Beijing and Shanghai. The impact on air quality by different emission heights are relatively small, the distribution to regional pollutant concentration from different chimney height by the power plant is concentrated in the East China, the concentrated area of influence in winter was significantly greater than that of summer. Even during the season with heavy pollution, Power plant emission over BTH area was rather low contribution to PM_2.5, which were less than 10%, the value of efficiency of environmental impacts to power plant emission was much lower than the other sectors.（3）The coal consumption of high electricity energy alternative scenarios is about 12 million tons higher than low electricity energy alternative scenarios, the proportion of residential emission reduction is about 14.3% and 3.3%, and the ratio of emissions reduction from industrial sources is about 11.7%, 3.5%. High and low scenarios show that electric energy alternative can significantly improve the air quality in BeijingTianjin-Hebei area, East China, central China and the southwest region, and the concentration of SO2, NOx and PM_2.5 are decreased significantly, compared with the current situation. The concentration of pollutants in the central and western regions of central China and southwest China is more obvious. Most of the pollutants concentration decrease more than 10%, the local concentrations of NOx and SO2 can be reduced by more than 20%, the concentrations of PM_2.5 decreased by more than 15%.（4） The simulation results of “Beijing-Tianjin-Hebei area scenarios” shows that, under the scenarios, using the electricity to replace for domestic sources is one of the effective ways to reduce the pollutant mass concentration in Beijing-Tianjin-Hebei area. The reduction of 30% residential emission is decreased about 7% to the total emission. The concentration of SO2, NOX and PM_2.5 can be reduced by more than 15%, 8%, 10%, respectively. On this basis, the total amount of pollutants emissions increased by about 4% with 30% increase of power plant emission. the concentration of all pollutants(SO2, NOX, PM_2.5) are still generally low, the max drop is about 12%, 4%, 8%, respectively.