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An Experimental Study of Reduction NOx Emissions by Superfine Pulverized Coal Reburning

An experimental study was conducted of reduction of NOx emissions by superfine pulverized coal reburning in Combustion Research Facility (CRF). Based on the systemically measured temperature distributions and analyzed gas samples, the influence of the attention was paid to the superfine pulverized coal reburning characteristic such as NOx emissions, slag formation conditions and mechanical incomplete combustion losses. Experimental results show that feeding pulverized coal for reburning has little influence on the furnace combustion center and slag formation. However, an increase in mechanical incomplete combustion losses was observed in the experiment. In addition, it was shown that the emission of NOx decreased obviously and the reduction efficiency was in excess of 60% with particle size of reburning fuel of 30.74 μm and the proportion of reburned fuel of 14.84%.