Experimental investigation for effects of pulverized-coal fineness on combustion characteristics

For LengShuiJiang and DouLiShan coal samples with different finenesses, the ignition characteristic, combustion efficiency and dynamic parameters were analyzed by thermogravimetry. A comprehensive judging index Hj, which is used to describe the combustion characteristics, is presented and compared. The experimental results show that under the same conditions such as heating-up rate and reaction environment, the released quantity of volatile matter and DTG peak value increases and, the activation energy and ignition temperature decreases when coal particle size decreases, and thus the maximum combustion rate and ignition occurs early. Above all, the ignition and combustion characteristics can be improved along with decrease of coal particle size.