Effect of the air supply location of a gasifier on composition and heating value of syngas

Abstract

Gasification of biomass through RDF to produce syngas for power generators is potential for our country. To ensure the storage possibility and improve fuel uniformity, biomass from agricultural waste is processed into RDF. RDF is then gasified to produce syngas to fuel internal combustion engines. This study focuses on the gasification of RDF biomass in a downdraft gasifier. The simulation results show that, when supplying ambient air, the mass concentration of CH₄ is almost unchanged, while spraying air to the center of the combustion chamber, the mass concentration of CH₄ decreases sharply with the air flow. The above simulation results also show that, when the air flow is small, the difference in calorific value for dissimilar air supply options is small. However, when the air flow is large, the difference in syngas calorific value for different gas supply options rises dramatically.