Apparatus for preparing synthesis gas based on dual fluidized bed biomass gasification and preparation method thereof

Abstract

The present invention discloses an apparatus for preparing synthesis gas based on dual fluidized bed biomass gasification, including a hopper, a dryer, a screw feeder, a pyrolysis fluidized bed, a reforming fluidized bed, a reforming cyclone separator, a calcination fluidized bed, a calcination cyclone separator, a first U-shaped refeeder, a second U-shaped refeeder and a third U-shaped refeeder. The method of the apparatus for preparing synthesis gas includes: feeding biomass into the hopper, feeding the dried biomass to the pyrolysis fluidized bed, pyrolyzing and gasifying, and feeding carbon residue into the calcination fluidized bed. In the calcination fluidized bed, the coke in solid residue is combusted with oxygen to decompose calcium carbonate. The products of gas phase and solid phase are separated by the calcination cyclone separator. The heat-carrying agent calcium oxide is fed into the reforming fluidized bed. The pyrolysis gas carries calcium oxide to increase to promote catalytic cracking of tar. The reformed gas is obtained by reforming the pyrolysis gas. The synthesis gas is obtained from a synthesis gas outlet. The apparatus for preparing synthesis gas can reduce the tar yield, and improve the synthesis gas heat value ?and gasification efficiency.

Description

technical field [0001] The invention relates to a device for preparing synthesis gas and a preparation method thereof, in particular to a device for preparing synthesis gas based on double-fluidized-bed biomass gasification and a preparation method thereof. Background technique [0002] At present, human beings are facing the dual pressure of economic growth and environmental protection. Changing the way of energy production and consumption, using modern technology to develop and utilize renewable energy including biomass energy, is conducive to the establishment of a sustainable energy system and the promotion of social and economic development. It is of great significance to improve the ecological environment and get rid of the dependence on fossil energy. [0003] Biomass energy has always been one of the important energy sources for human survival, including energy trees, energy crops, aquatic plants, various organic wastes, etc., which are converted into renewable energ...

AI Technical Summary

Problems solved by technology

The disadvantage is that the pyrolysis gas and tar need to be separated before the subsequent secondary pyrolysis reaction can be carried out. The temperature required for pyrolysis is high. Although the heat of fixed carbon in biomass coke is used, the overall heat consumption is large.

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