Three-section type biomass gasifying furnace

Abstract

The invention relates to a three-portion biomass gasifier, in which the thermal cracking section is formed by jacketed type thermal cracking cylinder, the furnace body equipped with insulating layer is divided into a grate upper gasification section and a grate lower gasification section by a grate; the grate comprises a plurality of equilateral roof steels, an air inlet pipe is arranged along the circumference at the inlet of the furnace body with a laryngeal aperture deposited, a gasification gas outlet is located at the lower furnace wall of the grate and an air intake pipe is uniformly arranged at the bottom of the furnace body. The biomass is thermal cracked into thermal cracking air and biomass coke, and the thermal cracking air is transmitted to laryngeal aperture area to burn and the tar oil in the thermal cracking air is cracked under high temperature; the resulting air reacts with the biomass coke, and the incompletely reacted biomass coke is bowled off by the grate to continue the gasification reaction at the bottom of the furnace. The invention combine thermal cracking characteristic of biomass, combustion characteristic of air with gasification characteristic of biomass coke, to keep the stable combustion of the biomass thermal cracking products passing through, so as to reach high temperature state to crack most of tar oil, therefore to improve the gas production rate of the gasifier and decrease the level of the gas producing tar oil.

Description

technical field [0001] The invention relates to a three-stage biomass gasification furnace, which is applied to the occasion of biomass gasification and relates to the fields of environmental protection, new energy and the like. Background technique [0002] As a renewable energy, biomass energy has been paid more and more attention, and biomass gasification is an effective way to utilize biomass. In the existing biomass gasification technology, the gasifier mostly adopts the downdraft, updraft or fluidized bed furnace type. The downdraft fixed bed gasifier pushes the biomass directly onto the grate, and the air is automatically The gasification gas enters from the middle of the material layer, and the gasification gas is drawn out from the bottom of the furnace grate; the up-suction fixed bed gasifier puts the biomass on the furnace grate, the air is introduced from the bottom of the furnace grate, and the gasification gas is drawn out from the top of the gasifier; In the ...

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Problems solved by technology

Because the high temperature cannot be generated in the gasification layer, the tar content of the generated gasification gas is relatively high, which not only increases the purification cost,...

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