Abstract: For those coal-fired generating units using low-sulfur coal with the advanced air pollutant control technologies and equipments applied, it is feasible to implement ultra-low emission technique of major air pollutant reductions no matter whether they are newly built or retrofitted units. Compared with the pollutant emissions of the existing coal-fired power plants in the Yangtze river delta and Beijing-Tianjin-Hebei region, the SO₂, NO_x, dust and primary PM_2.5 emissions of the corresponding power plants which would have ultra-low emission retrofit implemented will be reduced by more than 90% and the SO₃ emissions will be reduced by about 70%. Taking Jiangsu Province for example, the quantitive analysis on the PM_2.5 caused by air pollutant emissions of the power plants in the major cities of the province in 2012 is simulated with the MM5 and CULPUFF coupling model. The results show that the maximum contribution to the daily average concentration of the cities is between 27.3~42.9 μg/m³ with an average of 35.28 μg/m³, of which the secondary PM_2.5 accounts for 87.4%. After the implementation of ultra-low emission retrofit, the maximum contribution to the daily average concentration is between 6.2~12.5 g/m³, with an average of 9.43 μg/m³, of which, the secondary PM_2.5 accounts for 91.7%.

Key words: coal-fired power plant, ultra-low emission, PM2.5, reduction potential, environmental benefit