Downdraft gasifier

Abstract

The invention relates to the technical field of biomass gasification furnaces, and discloses a downdraft gasification furnace which comprises a furnace body, an oxidation zone is arranged in the furnace body, a reduction zone is arranged below the oxidation zone, a lower neatening plate is fixedly mounted in the reduction zone, an upper neatening plate is fixedly mounted in the oxidation zone, and gas inlet pipes are arranged on the two sides of the oxidation zone. According to the invention, the upper and lower neatening plates are arranged in the oxidation zone and the reduction zone, materials from a cracking zone are uniformly distributed in a neatening cavity, then the cavity for airflow flowing is arranged on the outer side of the neatening cavity, and air holes in the cavity are utilized to uniformly distribute air from multiple angles from the top and the peripheral side of a carbon block, and thus the internal oxidation-reduction reaction of the neatening plates is ensured to be carried out uniformly and thoroughly, the incomplete reaction caused by non-uniform air supply is avoided, the temperature of discharged gas is uniform, the condition of non-uniform drying of a drying area caused by non-uniform temperature is avoided, meanwhile, the components of the discharged gas are stabilized, and the gas quality is improved.

Description

technical field [0001] The invention relates to the technical field of biomass gasifiers, in particular to a downdraft gasifier. Background technique [0002] The air of the downdraft gasifier is blown in from the air nozzle on the side wall of the gasifier to produce gas; the flow direction is the same as the falling direction of the material, so it is also called a down-flow gasifier. The materials are mixed and burned in the oxidation zone, and the heat generated is used for the cracking of the material in the pyrolysis zone and the reduction reaction in the reduction reaction zone. The reduction reaction is located below the oxidation reaction, and the carbon, carbon dioxide and water vapor produced by the oxidation reaction react in this area. , the hot gas flow generated in the reduction zone will also pass through the pyrolysis zone and the drying zone, and conduct heat exchange through the heat conduction fins for cracking and drying. [0003] Due to the poor air su...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings in the use of the existing downdraft gasifier proposed in the background technology, the present invention provides a downdraft gasifier, which has the advantages of uniform air supply, uniform exhaust temperature, and uniform drying. It solves the problem of uneven reaction caused by uneven air supply and uniform exhaust temperature in the background technology mentioned above.

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