The quality of syngas produced by fluidised bed gasification using sunflower husk

Abstract

Gasification systems are successfully applied to the production of energy from biomass. In the present work, the effects of some parameters like excess air ratio and temperature on the quality and the composition of syngas produced in a fluidised bed gasifier using sunflower husks as fuel were investigated. The syngas composition for sunflower husk with an excess air ratio of 0.09 was about 39.62%, 43.39%, 0.3%, 0.5%, 15.41 for H₂, CO, CH₄, CO₂, N₂, respectively, in a moisture free basis. In this paper, the lower heating value of the syngas is reported as an indicator of the gas quality. The lower heating value of the syngas produced by sunflower husk was calculated from the concentration of the combustible components and it ranges from 6.7 MJ/Nm3 to 9.8 MJ/Nm3. The LHV of syngas produced decreased with excess air ratio. It has been found that the highest gas quality occurs at the lowest excess air ratio and at operating temperatures around 900°C.