Experimental Study on Enhanced Control of NOx Emission from Circulating Fluidized Bed Combustion

This paper explores possible measures of enhanced control of the nitrogen oxides (NO x ) emission from combustion on a new circulating fluidized bed (CFB) test platform, which is a combined CFB and post-combustion chamber (PCC). Characteristics of Shenmu char combustion and NO x emission were studied on the conditions of the secondary air (SA) arrangement, lean oxygen combustion, and post-combustion, respectively. In comparison to the conventional methods (SA arrangement), post-combustion is a new method to improve control of the NO x emission during the combustion process. Experimental results show that the approach of modifying the SA arrangement is able to remove the NO x emissions by up to 30%, the lean oxygen combustion can reduce NO x emissions significantly but resulting in a declined combustion efficiency, and post-combustion is able to bring the final concentration of NO x emission down to only 51 mg/m 3 (at 6% O 2 ), meanwhile maintaining the high combustion efficiency of 98.6%.