Pretreatment technology of biomass entrained flow gasification

Slow pyrolysis as the pretreatment technology before biomass entrained flow gasification was experimentally studied, and its feasibility assessed. The chemical composition and conveying characters of semi-char produced in the pretreatment were analyzed. At the same time, the entrained flow gasification results of biomass and semi-char were compared based on ASPEN PLUS software. The results show that the energy density of semi-char increases with the pyrolysis temperature. The mass and energy yields of semi-char are beneficial to the biomass entrained flow gasification with the pyrolysis temperatures between 300 and 400°C. The angle of internal friction and angle of repose decrease obviously with increasing the pyrolysis temperature. And the bulk density of semi-char is improved evidently with increasing the pyrolysis temperature. Based on the analysis with ASPEN PLUS, the entrained flow gasification result is most ideal when the pyrolysis temperature is 400°C.