A kind of biomass pyrolysis gasification method

Abstract

The invention discloses a biomass pyrolysis gasification method, which includes the following contents: (1) biomass raw materials are sent to a microwave pyrolysis reaction section, and pyrolysis occurs under the action of microwaves, and the pyrolysis products are gas, tar and semi-coke; (2) Pyrolysis products and working gas 1 respectively enter the microwave directional gasification section for gasification reaction; (3) Among the gasification products, semi-coke after gasification treatment is divided into two parts. The bottom of the chemical section is spirally transported to the upper part of the microwave pyrolysis reaction section, where it is mixed with the biomass raw material for microwave pyrolysis, while the other part of the semi-coke and the gaseous volatiles in the gasification products are transported to the plasma reaction section by the spiral; (4) enter the plasma The material in step (3) of the reaction section undergoes a plasma gasification reaction to obtain high-quality synthesis gas. The synthesis gas is sent out from the gas outlet, and the solid residue is discharged from the bottom of the plasma section. The method has a high biomass gasification rate, a high carbon conversion rate, and high-quality synthetic gas products, which can meet the requirements of synthetic liquid fuels and have good application prospects.

Description

technical field [0001] The invention belongs to the field of biofuels, and in particular relates to a biomass pyrolysis gasification method. Background technique [0002] Among many biofuel technologies, biomass indirect liquefaction has the characteristics of clean and environmentally friendly process and high product purity (oxygen content <1%, almost free of S, N and other impurities), and is a promising technical route. Biomass indirect liquefaction technology includes two stages of biomass gasification and Fischer-Tropsch synthesis, among which obtaining high-quality synthesis gas through appropriate biomass gasification technology is the key to this technology. The traditional fixed bed has consistent raw material requirements, poor heat transfer effect, and short residence time in the fluidized bed, all of which lead to a low overall carbon conversion rate, and the gasification temperature of the fixed bed or fluidized bed is generally <1000°C. The presence of ...

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Problems solved by technology

However, this technology also has obvious disadvantages: first, the raw material must be ground into submillimeter particles, and the biomass raw material is difficult to grind; second, it needs to consume more oxygen to generate high temperature, resulting in product gas H 2 / CO ratio is not high, energy consumption and carbon emissions are relatively high

[0006] CN102874750A discloses a method for pyrolysis and gasification of biomass and coke under a microwave field. The pyrolysis gasification rate is greater than 80%, and the hydrogen content in the gas product can reach 70%, but it cannot be completely removed by using a simple water cooling system. Tar, and there is a problem of recovery and recycling using zinc chloride as a catalyst

However, this method uses fluidized bed gasification, and the gas flow rate is fast, and it is easy to carry a large amount of particulate matter through the carbon layer, which requires subsequent deashing and impurity removal treatment.

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