Method and system for producing synthetic gas from biomass

摘要

High temperature gasifying process with biomass includes feeding, carbonization, powder making of charcoal, transportation of powdery charcoal and gasifying in gasifier, wherein the high temperature charcoal discharged from the carbonization furnace is condensed to 60-200°C through condenser, then is reduced to normal pressure by feeding apparatus for reducing pressure. The charcoal is turned into powder through powder making machine, and then the powdery charcoal is sent to feeding apparatus for increasing pressure, the powdery charcoal with increased pressure is ejected to gasifier by ejector. In the process, the pyrolysis gas produced from carbonization furnace is used as carrier gas, and the ratio of solid to gas in the transportation pipe for powdery charcoal is controlled to 0.03-0.45m3/m3 by adjusting the amount of pyrolysis gas for transportation. Carbonization goes on through direct combustion of additionally provided combustible gas and oxygen in carbonization furnace, the temperature of carbonization furnace is controlled at 400-600°C through adjusting the amount of oxygen. The system for performing the process is characterized in that the pipeline from the outlet of charcoal at carbonization furnace to gasifier is sequently positioned with condenser of charcoal, feeding apparatus for reducing pressure of charcoal, powder making machine, feeding apparatus for increasing pressure of charcoal and powdery charcoal ejector.