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《Electric Power Environmental Protection》 2007-06
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Numerical simulation of the best mixture ratio of coal and air in fuel staging combustion

Numerical simulation of the burning process and nitrogen oxide formed characteristic about the 1160t/h boiler of the power plant have been performed on fluent software. Through regulating mixture ratio of the coal and air to change the blend of powder and wind and atmosphere in the combustion area,so density distributions of C(s)、CO2、CO、O2、H2O(g) and formed characteristic of NOx in a furnace can be realized. For the combustion characteristic of the coal, the source of NOx depends on oxidization and separating out of nitrogen in coal. The simulation results display that the quantity change of coal directly affects distribution of burning products in furnace, thus influence the emission of NO, . With the increasing of coal quantity, emission of NOx increased first and then decreased, which explained that the best mixture ratio of coal and air is existed. By compared the results of three simulation conditions, the best mixture ratio of coal and air is recommended.
【CateGory Index】: TK223.72
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