Three-dimensional modeling of biphasic reaction characteristics in hybrid filtration combustion reactor with variable inlet parameters

To investigate the biphasic chemical reaction characteristics in fixed-bed hybrid filtration combustion reactor, a three-dimensional numerical model was developed using ANSYS Fluent with a surface combustion simulation approach. The study examined the effects of inlet temperature (1100–1500 K), steam-to-oxygen ratio (1:2–1:6), and mass flow rate (0.16–0.48 g/s) on flow characteristics, biphasic chemical reaction characteristics, and the influence of radiation on reaction characteristics.The results indicate that the mass flow rate has the most significant effect on the maximum velocity and the pressure difference across the reactor, with average increases of 33.48 % and 55.39 %, respectively. The influence of inlet temperature is secondary, while variations in the steam-to-oxygen ratio have minimal impact on the maximum velocity. Under different inlet conditions, carbon oxidation and carbon monoxide oxidation are the dominant reactions in heterogeneous and homogeneous chemical processes, respectively. The average reaction rate of carbon monoxide oxidation is 3.37 times higher than the rate of carbon oxidation. Furthermore, the inlet temperature has a pronounced effect on the water–gas shift reaction rate. When the temperature increases from 1100 K to 1500 K, the reaction rate of the water–gas shift reaction increases by a factor of 4134.74. Radiation significantly enhances the kinetics of surface chemical reactions, leading to rate increases of 427.25 % for the Boudouard reaction and 160.28 % for the water–gas shift reaction on particle surfaces. This study successfully investigated the effects of different inlet parameters on biphasic reaction characteristics in heterogeneous hybrid filtration combustion from a three-dimensional simulation perspective. Future studies are necessary to investigate the effects of particle material type and particle size distribution on the biphasic reaction characteristics.