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Kinetic Analysis on Combustion Characteristics of Microwave Irradiated Pulverized Coal

Experiments of combustion and granularity analysis as well as infrared spectroscopy were carried out on the investigation of raw and microwave irradiated pulverized coal (PC). It is indicated in the results that combustion properties of PC under different heating rates are ameliorated after irradiation. Meanwhile, a small decrease in granularity of PC is noticed after microwave treatment, which can prove to be invalid in optimizing the combustion performance of PC in the combustion of devolatilized PC. Simultaneously, radicals of high activity in PC are found to be increased, namely the superior combustion of irradiated PC is due to the activation of volatiles by microwave. Flynn-Wall-Ozawa (FWO) model is adopted to investigate the kinetics of PC combustion, it is indicated that the activation energy of irradiated PC is lower than that of raw PC under the conversion rate of 50%. After microwave treatment, the activation energy of Yungang and Yangquan PC is reduced by 20. 37 and 26. 91J??mol-1 respectively at the conversion rate of 20%. However, the difference in activation energy between raw and irradiated PC is reduced with the increasing of conversion rate. The activation energy of Yungang and Yangquan irradiated PC respectively returns to the level of raw PC at conversion rate of 50% and 60%. When conversion rate of two PC exceeds this level, the activation energy of irradiated PC becomes slightly higher than that of raw PC while the extent was not that significant.