Emission Characteristics of Particulate Matter from Coal-Fired Power Units with Different Load Conditions

摘要

As an important source of electricity production in China, coal-fired power boiler still emits high concentrations of pollutants such as particulate matter (PM) due to large amounts of flue gas. In this study, filterable and condensable PM (CPM) were sampled in three coal-fired units. In particular, the effects of unit load and flue gas temperatures on organic/inorganic components of CPM were investigated. The emission concentration of total PM reached the lowest at the highest load of the coal-fired unit. CPM, especially the organic components in it, accounted for a high proportion of the total particulates emitted from three units. The representative organic components hydrocarbons and esters accounted for more than 40 of CPM from coal combustion, while the representative inorganic component SO_4~(2-) had the highest emission concentration. The emission concentration of representative organic components and most inorganic components in CPM was lowest when the temperature of coal-fired flue gas was lowest. It was noted that the effect of operating load and flue gas temperature on the distribution of organic compounds in CPM is limited when raw coal properties are similar.