Abstract
Microwave heating has attracted extensive attention due to its advantages of low energy consumption and rapid heating. Due to its kinetic and thermal effects, microwave-induced activated coke discharge has been widely used in material preparation and reaction enhancement. However, the mechanism of microwave discharge for millimeter activated coke has not been clarified. In this work, we have investigated the mechanism of microwave discharge between millimeter activated cokes by experiments and simulations. Experimental results presented that the increase in particle size caused the inter-particle discharge transferred from weak sparks to large-scale violent discharge. Simulation results indicated that the increase in particle size led to enhanced microwave field resonance between particles, thereby promoting the inter-particle electric field, electron temperature and active species density. Finally, the particle size of cokes affected the deposition of microwave energy in discharge regions between particles. The influence of particle size on microwave-induced activated coke discharge was reflected in two mechanisms, namely, the microwave resonance enhanced mechanism that promoted the microwave energy deposition between particles and the focused microwave energy mechanism that dominated the inter-particle microwave energy deposition distribution concentrated in the center regions of the particle gap.
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