Combustion Characteristics studies of oil shale de-ash-like

Abstract

Oil shale from the 4th layers of Dachengzi mines in Huadian was treated by the acid-type chemical solution process, and the experiment was optimized by the orthogonal method with three factors and three levels. Combustion characteristics of oil shale de-ash-like and the effect of ash content and temperature rising rate on combustion characteristics was investigated by thermogravimetric analysis method. Result and conclusion: the ash content in the treated oil shale is significantly reduced to 4.13%, the volatile content in the treated oil shale is reduced, and the fixed carbon content in the treated oil shale is increased largely from 5.31% to 67.89%. The thermogravimetric analysis shows that with the decrease of ash in oil shale de-ash-like, diffusion resistance of the oxidation medium spreading to combustible ash layer is greatly reduced, which is more conducive to burning, energy consumption of burning is reduced and its effect on ignition and burnout is also reduced to minimum. Under the same final temperature, the burnout degree of oil shale after removing mineral falls with temperature rising rates. Finally, combustion kinetic parameters of oil shale de-ash-like were calculated by the integral method (Coats and Redfern method).