A kind of biomass pyrolysis gasification method

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.