Coal and ash samples from the combustion of pulverized subbituminous coal were analyzed from a utility scale boiler to determine size and chemistry of impurities. Comparison will be made to ash collected from a down-flow 19kW laboratory furnace which allows for scale-up to a 400 MW pulverized coal fired power plant. Characterization should provide insight on ash formation mechanisms and the transformation of impurities found in coal. Impurities can be organically associated inorganic constituents and included and excluded mineral grains. They undergo complex transformations which may produce particles centered around the 1-micron size. Other inorganic transformations may coalesce from submicron particles (centered around the ultrafine mode) into supermicron particles (coarse mode). The goal of this work is to identify the primary formation mechanism for the particles in the fine mode. Controlling the tendency for coal ash forming fine particulate matter will improve process efficiency and reduce emissions

Characterization of inorganic particulate materials of subbituminous pulverized coal  combustion to investigate ash formation mechanisms

242nd National Meeting (2011)

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