Biomass gasification method and device

Abstract

The invention discloses a biomass gasifying method and a biomass gasifying device. The biomass gasifying device comprises an upper furnace body with a feeding device, and a lower furnace body sleevingthe outer wall of the lower part of the upper furnace body, wherein a first gasifying agent inlet is formed in the upper part of the upper furnace body; a second gasifying agent inlet and an ash discharging device are arranged at the bottom of the lower furnace body respectively; a fluidized bed reaction chamber for a fluidized bed gasification reaction is formed in the upper part of the upper furnace body; a downdraft gasification chamber for a gasification reaction after material accumulation is formed in the lower part of the upper furnace body; an overlapping part overlapped with the upper furnace body is arranged on the upper part of the lower furnace body; an updraft gasification chamber for a reaction of a material and a second gasifying agent at the second gasifying agent inlet isformed in the lower furnace body; a fuel gas outlet is formed in the overlapping part and between the downdraft gasification chamber and the updraft gasification chamber. The biomass gasifying deviceand a biomass gasifying method, a fluidized bed gasifier, a downdraft gasifier and an updraft gasifier are combined, and the advantages of rapid reaction, large treatment amount, low tar content of fuel gas, low dust content in the fuel gas, low carbon content of ash residue and high energy utilization rate are achieved.

Description

technical field [0001] The invention relates to the field of biomass thermochemical conversion, more specifically, to a biomass gasification method, and also to a biomass gasification device. Background technique [0002] Biomass gasification devices are generally divided into fluidized bed gasifiers and fixed bed gasifiers. The fluidized bed gasification furnace has rapid response and large processing capacity, but the equipment is complicated, the gas dust content is high, and post-processing is difficult. Fixed bed gasifiers are divided into updraft gasifiers and downdraft gasifiers. The updraft gasifier has high thermal efficiency, but the tar content in the gas is high. The tar content in the downdraft gasifier gas is small, but there are problems such as low carbon conversion rate and difficulty in large-scale. [0003] Current biomass gasification devices are generally single fluidized bed gasifiers or fixed bed gasifiers, each of which has its own limitations. ...

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Problems solved by technology

[0005] In view of this, the first object of the present invention is to provide a biomass gasification device to solve the problems of small biomass gasification device processing capacity, high tar content, low carbon conversion rate, etc.

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