Abstract:
Coal-fired boiler is one of the primary sources of ambient fine particulate matter in China in terms of source apportionment. In order to understand the emission characteristics and control status of fine particles emitted from coal-fired boilers, some relevant research findings both at home and abroad were summarized systematically, including the size distribution characteristics, component characteristics, emission forms and possible influencing factors of the fine particles. The removal efficiency of fine particles of current dedustors for the flue gas from coal-fired boilers as well as corresponding technical improvements on the dedustors was reviewed. Recent management situation of stationary pollution sources and sampling methods of fine particles both at home and abroad were summarized. Aiming at existing deficiency of research and management, several suggestions are proposed. Firstly, the research should be strengthen on the size distribution characteristics and formation mechanism of fine particles generated and emitted from coal-fired boilers from the point of view of source control, targeting the reduction of the emission of primary condensable particles and the precursors of secondary fine particles. Secondly, the study on component characteristics of fine particles from local coal-fired boilers should be strengthened. Thirdly, the development of efficient dedusting technologies should be accelerated, especially focusing on the affordable control technologies of fine particles for industrial coal-fired boilers. Fourthly, great attention should be paid to the study and management policy of the number concentration of fine particles and superfine particles. Finally, it is suggested that the standard sampling methods and emission limit of fine particles from stationary sources should be formulated by relevant administrative departments.