Mathematical modeling for molten ash slagging moving bed coal gasifier considering the impact of particle behavior characteristics

[Display omitted] •Particle size and bed voidage change due to particle fragmentation & agglomeration was revealed.•Molten ash attenuating gas–solid reaction rate was considered.•The effect of gas channeling on gas–solid heat transfer and gas temperature was investigated. Molten ash slagging moving bed gasification technology is significant for lump coal utilization. Mathematical modeling is essential for a comprehensive understanding of transport and reaction phenomena in a gasifier. In this work, a model based on the impact of particle behavior characteristics was proposed, encompassing: (i) particle fragmentation and agglomeration vary the particle size and bed voidage, (ii) gas channeling weakens the gas–solid heat transfer efficiency and variation of the gas phase temperature, and (iii) molten ash covering coal surface attenuates the gas–solid reaction rate. A good agreement was found between the simulation results of the proposed model and industrial data. Finally, the effects of the operating and model parameters were studied. The results indicated that the steam flow rate had a significant influence on the product gas composition, and the temperatures of gas and solid phases were sensitive to the gas channeling factor.