Numerical Simulation on South American Coal Reburning in a Pulverized Coal Combustor

With the increasingly serious impacts of NOx on environment, measures of controlling NOx are extremely necessary. Reburning technology has become a proven and effective method to control the emissions of NOx. In this paper, CFD software has been used to simulate the reburning process of South American coal (SAm) so as to study the effect of the reburning on the combustion in the furnace and NOx reduction. The result shows that, SAm reburning can reduce NOx emissions effectively, and removal rate of NOx reaches 50.63% with respect to the conventional combustion.

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%.