Permitted emissions of major air pollutants from coal-fired power plants in China based on best available control technology

摘要

Based on the activity level and technical information of coal-fired power-generating units (CFPGU) obtained in China from 2011 to 2015,we,1) analyzed the time and spatial distribution of SO2 and NOx emission performance of CFPGUs in China;2) studied the impact of installed capacity,sulfur content of coal combustion,and unit operation starting time on CFPGUs' pollutant emission performance;and 3) proposed the SO2 and NOx emission performance standards for coal-fired power plants based on the best available control technology.Our results show that:1) the larger the capacity of a CFPGU,the higher the control level and the faster the improvement;2) the CFPGUs in the developed eastern regions had significantly lower SO2 and NOx emission performance values than those in other provinces due to better economic and technological development and higher environmental management levels;3) the SO2 and NOx emission performance of the Chinese thermal power industry was significantly affected by the single-unit capacity,coal sulfur content,and unit operation starting time;and 4) based on the achievability analysis of best available pollution control technology,we believe that the CFPGUs' SO2 emission performance reference values should be 0.34 g/kWh for active units in general areas,0.8 g/kWh for active units in high-sulfur coal areas,and 0.13 g/kWh for newly built units and active units in key areas.In addition,the NOx emission performance reference values should be 0.35 g/kWh for active units in general areas and 0.175 g/kWh for new units and active units in key areas.