Abstract
ABSTRACT Efficient separation of residual carbon and ash in coal gasification fine slag is of great significance for clean utilization of coal, resource conservation, and environmental protection. In this study, a novel corona charging approach was proposed to enhance particle charging and improve the electrostatic separation efficiency of coal gasification fine slag. A multiphysical model was established to investigate the coupling effects of the electrostatic field, gas flow field, and particle charging behavior. The results showed that, under the effect of positive DC corona on particle charging, the electric field voltage was positively correlated with the charge-to-mass ratio (CMR) of the particles. As the particle size increased, their charge amount increased, while the CMR decreased. The inlet gas velocity obviously affects the charging time of particles, resulting in a decrease in the average CMR with increasing gas velocity. Comparative experiments revealed that implementing corona charging promoted the decarbonization efficiency and carbon recovery efficiency (REC) by 17.99% and 23.66%, respectively, significantly improving the electrostatic separation of carbon and ash particles in coal gasification fine slag.
Published Version
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