Downdraft type gasifier

Abstract

The invention discloses a downdraft type gasifier which comprises a furnace base, a gasifying reaction section arranged on the furnace base, a material cabin arranged above the gasifying reaction section, a feeding hopper arranged above the material cabin, a material distribution machine extending into the material cabin from the position above the material cabin and an air blower for blowing airfor the gasifying reaction section, wherein the lower end of a hollow shaft of the material distribution machine extends to be above a throat opening, and a stirring blade is arranged at the lower part of the hollow shaft in the material cabin; a ventilating pipe, a connection sleeve and the hollow shaft can form a sealed air channel to increase a middle air inlet channel for the gasifying reaction section. The downdraft type gasifier has the characteristics of scientific structure, convenience in feeding control and evener air inlet; the material distribution machine can stir and neaten biomass raw materials in the material cabin, so that bridging and arching of fuel gas are avoided in the throat opening, and dry combustion and deviant combustion of gasifying reaction are avoided; a gas production efficiency is favorable for being improved, ash can be discharged more smoothly, gas production continuity is good, and the problems of dry combustion, deviant combustion, slag bonding and ash and slag discharging difficulty of an existing downdraft type gasifier are solved.

Description

technical field [0001] The invention relates to a gasification furnace, in particular to a gasification furnace using raw materials such as biomass molding fuel and straw, wood chips, garbage, etc. as fuel. Background technique [0002] With the increasing pressure of environmental protection, the emission of carbon dioxide is an important global issue, and countries all over the world are looking for renewable energy to replace the traditional energy structure that uses fossil raw materials as the basic energy. my country is a large agricultural country with sufficient biomass resources. In the development and utilization of biomass energy, the common methods are direct combustion or gasification power generation. Gasification power generation is limited by cost and the economic benefits are not good. Traditional stoves have a long history of using firewood and straw. Traditional stoves are inconvenient to use and have a low utilization rate of calorific value, generally on...

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Problems solved by technology

[0007] The technical solutions of the aforementioned patent applications have high practical value, but there are still some defects in the structure of feeding and slag discharge: (1) feeding makes it difficult for wood chips with complex shapes to be bridged, resulting in insufficient oxygen supply coverage, Fuel combustion is not uniform, and gas production efficiency is not high enough; (2) The reliability of the ash discharge mechanism is not high; (3) The system is too complicated and the equipment is too expensive

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