Catalytic effects of simulated biomass ashes on coal gasification characteristics and the transformation evolution during gasification process

Compared to potassium-containing minerals, calcium-containing minerals have stronger reactivity and are more likely to react with silicates to form calcium-containing silicates, such as calcium zeolites (CaO·Al2O3·2SiO2·4H2O), thereby avoiding the reaction between potassium-containing minerals and silicates to form non-catalytic minerals, which allows potassium to fully exert its catalytic effects.

Dynamic analysis implies that shrinking core model well describes the gasification process of deashing coal catalyzed by simulated biomass ash. When the Si/K mass ratio is 0.5 and the Ca/K mass ratio is 0.4, the activation energy of composite coal sample is reduced to 174.39 kJ/mol, which is 14.32% lower than that of raw coal.