Effects of structural parameters on two-phase reaction processes in gasification: Three-dimensional simulation of hybrid filtration combustion reactor

A simplified three-dimensional hybrid filtration combustion gasification model was developed to investigate the effects of wall temperature (adiabatic wall, 1050–650 K), length of hybrid filter bed (53–133 mm), and reactor diameter (16.8–39.6 mm) on the two-phase chemical reaction characteristics during the gasification process. The results show that wall temperature exerts the most significant influence on the CO molar fraction, followed by length of hybrid filter bed, while reactor diameter has the least effect. The H₂ molar fraction is insensitive to changes in reactor structural parameters. A low wall temperature markedly reduces both the lower heating value and cold gas efficiency of the product gas, whereas under adiabatic wall conditions, the lower heating value reaches 6.19 MJ/m³ and the cold gas efficiency peaks at 89.14 %. A decrease in wall temperature suppresses all CO-producing reaction rates, significantly inhibiting CO formation. Increasing the length of hybrid filter bed and reactor diameter selectively promotes CO production. The inhibitory effects of radiation on lower heating value and cold gas efficiency increase with decreasing wall temperature, with maximum suppression levels of 204.96 % and 48.81 %, respectively. Moreover, under non-adiabatic conditions, radiation suppresses the overall chemical reactions, with the average inhibition of homogeneous reactions being 6.30 times greater than that of heterogeneous reactions.