Numerical study on characteristics of biomass oxygen enriched gasification in the new gasifier on an experimental basis

In this paper, the integrated characteristics of a fluidized bed combining a distributed entrained flow bed in a new reactor, and the oxygen enriched gasification performance of biomass in the integrated reactor were studied numerically on the basis of experiments. A 3D numerical model was established by FLUENT and Eulerian-Lagrangian method was selected to solve the model. Simulation results show the integrated characteristics, where the lower-stage of the reactor performs the characteristics of distributed entrained flow, and the upper-stage shows fluidized bed characteristics by fluid upward returning. In addition, the influencing factors of oxygen-carbon mass ratio (O/C) and oxygen concentration of gasification agent, were studied based on experiment. The results show that as the O/C increases, the concentrations of H-2 and CO2 in the syngas gradually decreases but the CO concentration remains stable. The effect of O-2 concentration on syngas composition is related to its O/C. The concentrations of CO and CO2 rise as the O-2 concentration increases. However, when the O/C is between 0.35 and 0.55, as the oxygen concentration increases, the H-2 concentration shows a trend of firstly increase and then decrease. All the numerical and experimental results are in good agreement. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This paper studied the integrated characteristics of a fluidized bed combining a distributed entrained flow bed in a new reactor, and the oxygen enriched gasification performance of biomass in the integrated reactor numerically based on experiments. The results show that oxygen-carbon mass ratio and oxygen concentration of gasification agent significantly affect the syngas composition in the integrated reactor.