Experimental Study on Characteristics of NO_x Emission from Anthracite Coal and Blended Coals Combustion

The power coals of Shandong Province are chosen, in order to make investigation on emission characteristics of NO during the combustion of anthracite coal blended with different coals under different mixing ratios. The results show that as the increase of the volatile content, which of the coal blended with anthracite coal, the first peak and the total emission of NO increases, but the total emission time decreases obviously; while mixing ratio of the anthracite coal and lignite coal is 1:3, there is the inhibition of NO; while blended with bituminous coal, NO releases rapidly as the bituminous coal accounts for a larger proportion, and the peak of NO become higher; while anthracite coal blended with lean coal in the same quality, there is a phenomenon called ‘tacking’. In addition, nitrogen conversion rate decreases as the nitrogen content of the fractional coal increases which is blended in the anthracite coal.