A core structure of a biomass gasifier

Abstract

The invention discloses a furnace core structure of a biomass gasifier. An insulating layer is arranged between the inner wall and the outer wall of the gasifier core; a material collecting hopper, a throat, a gasification reaction chamber and a fire grate are arranged inside the gasifier core from top to bottom in turn; the throat is a circular cone structure, and a plurality of downward inclined air nozzles for blowing towards the gasification reaction chamber are arranged on the surrounding of the throat; an ignition device for blowing hot wind to the gasifier core is arranged inside the insulating layer; and the gasification reaction chamber is a cylinder structure, two layers of mutually fitted tube walls, namely an inner tube wall and an outer tube wall are arranged on the gasification reaction chamber, the inner tube wall is integrally welded with a taper wall of the upper throat and the outer tube wall is integrally welded with the lower fire grate mouth. The furnace core structure of the biomass gasifier has the advantages of compact structure, high gasification reaction temperature of 1200 DEG C, short warming starting time, convenience in ignition and efficient gas generation. Pyrocarbon is taken as a tar cracking catalyst so that the tar content can be obviously reduced and the dust-cleaning apparatus of the gasifier can be simplified. The furnace core structure of the biomass gasifier is suitable for the small and medium-sized biomass gasifier.

Description

technical field [0001] The invention relates to a cooker, in particular to a gasification combustion cooker using biomass raw materials such as firewood and straw as fuel. Background technique [0002] my country is a large agricultural country, and there is sufficient biomass energy such as firewood and straw. In the development and utilization of biomass energy, the common method is direct combustion or gasification power generation. However, when direct combustion is used, fuelwood needs to be added to the stove frequently. , it is inconvenient to use, gasification power generation is limited by the cost, and the economic benefits are not good, so it cannot be widely applied. [0003] 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 only 15% to 20%, which causes serious air pollution. It is also gradually abandoned in the vast rural areas, resulting ...

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Problems solved by technology

[0002] my country is a large agricultural country, and there is sufficient biomass energy such as firewood and straw. In the development and utilization of biomass energy, the common method is direct combustion or gasification power generation. However, when direct combustion is used, fuelwood needs to be added to the stove frequently. , inconvenient to use, gasification power generation is limited by cost, poor economic benefits, and cannot be widely applied

[0003] 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 only 15% to 20%, which causes serious air pollution.

It is also gradually abandoned in the vast rural areas, resulting in less and less development and utilization of biomass energy, and cannot effectively utilize a large amount of renewable firewood and straw in rural areas

[0004] For this reason, a small-scale biomass gasifier core structure that gasifies biomass such as firewood and straw into combustible gas has emerged as the times require. People have invented an updraft gasifier that sucks the generated gas upwards. There are some defects in the suction gasification stove: (1) The high tar content leads to a short life of the gasification stove, and even if the filter is added, it will cause difficult maintenance; (2) The gas production is unstable and the gasification of biomass It is difficult to control, which greatly affects the promotion of gasification stoves; (3) The calorific value of gas production is low, and the gasification of biomass is not sufficient enough, so that the calorific value of gas production cannot meet the daily use requirements

However, in the follow-up improvement process of the inventor, it was found that the structural design of the gasification furnace core had some defects such as poor thermal insulation performance of the gasification furnace core, poor resistance to thermal expansion and contraction, incomplete gasification, and incomplete removal of tar, etc. The gas production of biomass fuels such as firewood and straw is unsatisfactory

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