煤炭是我国的主要能源,在我国可燃矿物资源的可采储量中占90％以上,在一次能源消费结构中占70％以上。我国年产煤7亿多吨,84％以上用于直接燃烧,不仅热能利用率低,而且排放到大气的SO_2及飘尘等,严重污染环境。我国城市大气污染程度与世界技术先进国家比悬浮微粒高8倍,SO_2高 Coal is the main energy source in China, accounting for more than 90% of the recoverable reserves of combustible mineral resources in our country and over 70% of the primary energy consumption structure. China’s annual output of 700 million tons of coal, more than 84% for direct combustion, not only low utilization rate of thermal energy, and emissions to the atmosphere of SO2 and fly ash, serious environmental pollution. The degree of urban air pollution in our country is eight times higher than that of aerospace aerosols in countries with advanced technologies in the world,