Research Of Primary PM_2.5 Emissions Reduction Potential For The Coal-Fired Power Plants In China

Coal-fired power plant is one of the important sources of emissions PM_2.5,the study of its emission reduction potential could provide theoretical guidance for the control of its emission,and provide technical support for the government to formulate the haze control regulations and policies,especially environmental protection department.The paper regard PM_2.5 emission reduction potential of coal-fired power plant as target,carried out the site monitoring of PM_2.5 control technology from the typical coal-fired power plants and control technology assessment,and established the model of abatement potential.And with responding to the model,the different control scenarios were investigated with respect to different time-periods and regions Emission reduction potentials and spatial distributions of PM_2.5 from Chinese coal-fired power plants in 2017,2020,and 2030 were predicted by the model with year 2012 as the basis,respectively.On the basis of the research PM_2.5 control countermeasure and the suggestion for China's coal-fired power plants were proposed.The results indicated that: China's coal-fired power plant PM_2.5 control technology was mainly based on electrostatic precipitator?ESP?,and the bag filter and the electric bag composite dust collector developed rapidly.Except the Beijing-Tianjin-Hebei region,the Yangtze River Delta and Pearl River Delta,the level of control technology was almost the same.The control level of primary PM_2.5 for two power plants was monitored via using dilution sampling method with the electrical low pressure impactor plus?ELPI+?combined.The test results showed that the emission concentration reached 5.45mg/m3 and 3.17 mg/m3 respectively,and both of them could meet the new standards for thermal power plant air pollutant emissions.The assessment model,that contained three aspects of environment,economy and technology and sixteen evaluation indexes,was established via the fuzzy comprehensive analysis method.Seven kinds of technologies or combination,that included ESP,the bag filter,the electric bag composite dust collector,ESP+WESP,ESP with a high-frequency power supply + WESP,ESP with a high-frequency power supply + WESP and the electrocoagulation+ ESP,were assessed comprehensively.The results showed that whether it is comprehensive analysis or focused on environmental performance,the low-low temperature ESP with a high-frequency power supply + WESP and ESP with a high-frequency power supply + WESP are the best control technologies.Compared with those without power generation structure adjustment,different degrees of PM_2.5 emission reductions with power generation structure adjustment in coal-fired power plants could be realized.Nevertheless,PM_2.5 emissions still increased compared with those in 2012.When combined with optimum end-pipe control measures for a further PM_2.5 emission reductions control,the largest reduction potentials in 2017,2020 and 2030 would approach 59.42×104±7.83×104,82.83×104±5.82×104 and 81.89×104±6.76×104 tons,respectively.The total emissions reduction potential of Beijing-Tianjin-Hebei,Yangtze River Delta and Pearl River Delta would be 22.68×104,22.36×104,22.07×104 tons,respectively,in 2017,2020,2030 after ultra-low emissions technology were implemented.Emissions reduction potentials of Inner Mongolia,Jiangsu,Shandong,Guangdong,Hebei and Shanxi could also be more than 3.00×104 tons,if ultra-low emissions were implemented.The results showed that nationwide implementation of the ultra-low emission could significantly reduce PM_2.5 emissions from coalfired power plants in China.