A dual fluidized bed biomass staged gasification system

Abstract

The utility model relates to the technical field of biomass energy conversion, disclose a kind of double fluidized bed biomass grading gasification system, comprising: pyrolysis fluidized bed carries out low-temperature pyrolysis to biomass, and by first cyclone separator, pyrolysis gas is sent into pyrolysis gas outlet, and solid matter is sent into first return feeder;Tubular reaction unit purifies the pyrolysis gas that flows;Gasification fluidized bed receives the pyrolysis gas that tubular reaction unit transports and the solid matter that first return feeder transports, after carrying out oxidation-reduction reaction, generate synthesis gas, and by second cyclone separator, synthesis gas is discharged and reused, and hot carrier in solid matter is returned pyrolysis fluidized bed by second return feeder;The gasification temperature in gasification fluidized bed is higher than the pyrolysis temperature in pyrolysis fluidized bed.The application is coupled by double fluidized bed design, realizes biomass grading pyrolysis and gasification, and tar content of synthesis gas is low;And the pyrolysis gas after purification is used as gasification agent, secondary use in gasification fluidized bed, save resources.

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