Experimental study on the effect of ultrasonic cavitation on pyrolysis characteristics of oil shale

摘要

In order to investigate the pyrolysis characteristics of oil shale under in the extreme conditions of high temperature and high pressure generated by the ultrasonic cavitation. The different particle size of oil shale is mixed with water in accordance with the volume ratio of 1:12, under in different ultrasonic frequency and different power, the ultrasonic radiation experiments and the thermogravimetric experiments of different samples have been done. The results show that the organic content of oil shale samples reduced after ultrasonic radiation, and the chemical reaction rate of the remaining organic matter become faster, and its reflected as the volatile separate out rate was accelerated and the changes of TG(Thermogravimetry) and DTG(Derivative Thermogravimetry) curves were steeper. Oil shale pyrolysis weight loss rate peak values and the organic matter decomposed percentage during the pyrolysis have the selective on the ultrasonic frequency, ultrasonic power and particle size of the oil shale. Oil shale pyrolysis weight loss rate peak value increased with decreasing of ultrasonic power, and the weight loss rate peak value corresponding to the peak temperature was increased with the increasing of ultrasonic frequency, and the weight loss rate peak value corresponding temperature decreased with particle size increasing of oil shale. We can draw the conclusion that the ultrasonic cavitation can decomposition organic matter of oil shale, then, we should in-depth research the ultrasonic refining shale oil.