Research On The Effect Of Microwave Modification On Pulverized Coal Combustion Properties

First, coal combustion experiments, we can get modified under the conditions of the various coal combustion rate changes, Modification of power and determine the best time. Secondly, the pyrolysis of coal to do, compared to pulverized coal combustion performance before and after modification changes, analysis of reasons for the increase rate of pulverized coal combustion. Again, by scanning electron microscopy analysis of the surface of coal, coal particles obtained microstructure changes. Finally, the spectrum analysis of pulverized coal, pulverized coal compared before and after modification of the element changes. Through a large number of experiments and analysis resulted in a number of valuable conclusions.Through industrial microwave power and time in different treatment under the coal, it get when microwave power 396w, the Jinjiazhuang burning anthracite in the 50s when the highest rate, 49.79% of pulverized coal combustion rate increased to 61.57%, 11.78% increase; Xuanhua bituminous coal in the microwave power is 264w, 100s modified time when the burning rate of 68.56% to 72.31%, 3.75% increase.TG curves obtained from the analysis, Jinjiazhuang coal in the modified conditions 396w/50s curve when moving to the low temperature region; Xuanhua coal in the modified conditions 264w/100s curve when moving to the low-temperature region, indicating that modified on the combustion of pulverized coal beneficial. DTG curves of the two coal analysis concludes that coal Jinjiazhuang conditions 396w/50s modified slightly when the curve moves to the low temperature zone, the maximum pyrolysis rate 0.26mg/min, than the raw coal increased 0.1355mg/min , corresponding to the peak temperature of 486℃, lower than the raw coal 21.6℃; Xuanhua modified conditions for pulverized coal in the low temperature zone moves 264w/100s curve, the maximum pyrolysis rate 0.21mg/min, than the raw coal increased 0.083mg / min. Peak temperature of 446.3℃, the temperature dropped more than coal 9.7℃. Two types of coal by TG-DTG comprehensive analysis before and after modification can be drawn from the ignition temperature of pulverized coal. Jinjiazhuang coal ignition temperature is 440.7℃, time microwave power 396w 50s modified ignition temperature of 434.2℃, burning down 4.7℃; Xuanhua coal ignition temperature is 320.4℃; microwave power 264w 100s modified time of the pulverized coal ignition temperature of 316.9℃, ignition reduced 3.5℃.Obtained by scanning electron microscope photograph analysis, the following conclusions can be drawn: microwave power is 264w, 100s Xuanhua coal modification time, the coal surface becomes rough, increased porosity, specific surface area increases. Microwave power is 396w, Jinjiazhuang time in the 50s when the modified coal, coal surface becomes rough, increased porosity, specific surface area increases.By spectrum analysis, and Xuanhua Jinjiazhuang coal power and coal in the modified time conditions, a larger proportion of fixed carbon and oxygen ratio decreased. This shows that the modified coal in precipitation water of crystallization, which will help improve the theoretical combustion temperature of pulverized coal, the burning benefit.