Characteristics and kinetics of coal char steam gasification under microwave heating

The behavior and kinetics of coal char steam gasification under microwave heating are investigated. The influence of the coal char particle size, water injection rate, and reaction temperature on the carbon conversion rate and gas product evolution during microwave heating gasification are considered and compared to the results from coal char steam gasification using conventional heating under the same conditions. The results show that microwave heating can accelerate the reaction rate of coal char steam gasification and improve the quality of the gas product. It was found that at temperatures varying from 600 to 900 degrees C, the coal char steam gasification reaction was well described using the shrinking core model (SCM). Activation energies of 82.8 kJ/mol and 114.3 kJ/mol were obtained for microwave heating and conventional electric heating, respectively.