Biomass gasification furnace using furnace interlayer structure for decoking

Abstract

A biomass gasification furnace that utilizes the interlayer structure of the furnace body for decoking, which includes a furnace body provided with a drying layer, a pyrolysis layer, a reduction layer and an oxidation layer, and the furnace body is provided with a feeding port, a gasification medium inlet and a The gas outlet is provided with a fire grate in the furnace body, which is characterized in that the furnace body is constructed as a sandwich structure with a gasification channel, and the gasification channel includes a gas channel and a gasification medium channel, wherein one end of the gas channel communicates with the reducing layer, and the other One end is connected with the gas outlet, so that the combustible gas generated in the furnace is forced to flow through the reducing layer and discharged, and the high temperature of the reducing layer is used to further crack the tar in the combustible gas to reduce the tar content. The invention overcomes the shortcomings of traditional gasifiers and effectively combines its advantages, solving the problems of high tar content of combustible gas discharged from the updraft gasifier and inconvenient addition of materials, and difficulty in gas extraction of the downdraft gasifier question. In addition, the present invention uses the structure of the furnace body to construct channels, which can increase the flow rate of air intake / exit, which is beneficial to maintain the stability of the reaction in the furnace.

Description

[0001] 【Technical field】 [0002] The invention relates to a biomass gasification furnace, in particular to a biomass gasification furnace which utilizes a furnace interlayer structure for decoking. [0003] 【Background technique】 [0004] Biomass gasification is the process of producing combustible gas through dry distillation and thermochemical reaction of biomass under anaerobic conditions. Common biomass gasification processes include processes or reactions such as drying, pyrolysis (also known as cracking), oxidation, and reduction. Biomass gasification is usually carried out in a biomass gasifier. Therefore, the internal structure of a biomass gasifier can be divided into a drying layer (also known as a drying area), a pyrolysis layer (area), and an oxidation layer (area) according to the gasification reaction process. Layer (area), reduction layer (area). After the biomass raw material enters the gasifier, it is heated in the drying layer to evaporate the water in the ...

AI Technical Summary

Problems solved by technology

However, since the natural direction of heat flow is from bottom to top, while the direction of gas discharge is from top to bottom, it takes a lot of power to extract combustible gas, and the combustible gas that comes out of the furnace contains more ash.

In addition, due to the high temperature of the gasification zone, the temperature of the combustible gas released from the furnace is relatively high, which needs to be cooled with water, and the heat resistance requirements of the gas extraction equipment are also high. Therefore, although the combustible gas tar released from the furnace The content is low, but there are some difficulties in getting gas

[0008] All in all, the existing updraft and downdraft gasifiers have their own advantages and disadvantages, and further improvement is still needed, especially the high tar content of the updraft gasifier, which not only causes the loss of energy contained in the tar, but also directly Discharge will cause serious environmental pollution

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