A particulate matter (PM) emission model was developed based on the combustion modes and pollution control devices in China's coal-fired power plants.The PM emissions from coal-fired power plants in China from 2000-2010 were calculated with the model.The results showed that PM emissions from coal-fired power plants peaked in 2005,with 375 × 104 t of TSP,237 × 104 t of PM10 and 129 × 104 t of PM2.5,and then decreased year by year.In 2010,emissions of TSP,PM10 and PM2.5 dropped to 166 × 104,126 × 104 and 85 × 104 t,respectively.With increasing use of electrostatic precipitators and wet flue gas desulfurization technologies,the proportions of PM2.5 in total PM increased from 34.3％ in 2005 to 51.2％ in 2010.Coal-fired power plants should focus on fine particle emissions reduction in the future.In addition,the distribution of PM emissions among provinces is uneven:Inner Mongolia,Shandong,Henan,Jiangsu,Shanxi and Guangdong combine to contribute 44％ of emissions of China.The situation of emission control among provinces is different.The PM2.s emission factors were 0.35-0.75 kg/t for pulverized coal furnaces and 0.27-0.90 kg/t for circulating fluidized bed boilers.In terms of the impacts by unit capacity,units of less than 30 × 104 kW were the main source of PM ＞10,while those of 30 × 104 kW or more dominated PM2.s emissions (64.6％) from coal-fired power plants,due to the larger coverage of electrostatic precipitator and wet flue gas desulfurization technologies in the coal-fired units above 30 × 104 kW than in those below 30 × 104 kW.%基于我国燃煤电厂(不含港、澳、台数据,下同)的燃烧技术及颗粒物控制技术分类,建立了燃煤电厂颗粒物排放计算方法.利用该方法,分析了2000-2010年我国燃煤电厂颗粒物排放量及分布特征.结果表明:我国燃煤电厂颗粒物排放量自2000年起持续增加,于2005年达到最高值(375×104 t),其中PM10、PM25排放量分别为237×104、129×104 t;此后逐年降低,2010年降至166×104 t,其中PM10、PM25排放量分别降至126×104、85×104t.随着静电除尘及湿法脱硫的普及,颗粒物中PM25所占比例由2005年的34.3％升至2010年的51.2％.我国燃煤电厂颗粒物排放地区分布不均衡,2010年内蒙古、山东、河南、江苏、山西和广东六省区的排放量占全国排放总量的44％.PM25排放因子也因各省燃煤电厂颗粒物排放控制技术不同而产生差异,其中煤粉炉、循环流化床锅炉的PM25排放因子分别为0.35 ～0.75、0.27～ 0.90 kg/t.从机组规模影响来看,单台容量在30×104 kW以下的燃煤机组是粗颗粒(PM＞10)的主要来源,而在30×104 kW以上的燃煤机组对PM25排放贡献(64.6％)较大,这主要与这类燃煤机组静电除尘和湿法脱硫的安装比例高有关.
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