Method and device for biomass compound gasification

Abstract

The invention discloses a biomass complex gasification method and a device of the gasification. The thermal decomposition, the gasification, part of the oxidation process are combined in one reactor by the integrating the fluidized bed and the airflow bed. Firstly, the biomass is decomposed at 500 to 600 degrees C and generates hard coke; secondly, the hard coke with large grain sizes are partly oxidized and gasified in the hard coke gasifying section, which provides heat and generates combustible gas for the thermal decomposition section; thirdly, the reaction gases with small hard coke grains discharged from the thermal decomposition section and the catalyst fast flows upwards through the macromolecular gasifying section, and the reaction gas are partly oxidized because of the function of the secondary gasifying agent, the heavy tar component is forced simultaneously through thermal cracking reaction and catalytic cracking reaction with the catalyst at the temperature over 1000 degrees C and transformed to lightweight combustible gas; at last, the unreacted hard coke is sent back to the furnace through the gas-solid separation device and the solid recycling device. The biomass complex gasification method has the advantages of high gasification efficiency, low tar content, high control ability of the gas component, stable operation and easy enlargement.

Description

technical field [0001] The invention relates to the technical field of biomass gasification, in particular to an integrated biomass composite gasification method and device for removing tar in a furnace. Background technique [0002] Due to the increasing shortage of petroleum resources, environmental pollution and greenhouse effect problems are becoming more and more serious, it is gradually becoming a development trend to obtain high-grade liquid fuels and chemicals from abundant biomass agricultural and forestry waste resources (such as straw, etc.). attracted great attention. Biomass gasification technology can convert various waste biomass into high-grade gaseous fuels. It is the main core technology for producing liquid fuels and chemicals through thermochemical conversion, and for power generation, gas supply and heat supply. The market prospect of biomass-based liquid fuels and chemicals will ultimately depend on cost competitiveness, and an efficient and economical...

AI Technical Summary

Problems solved by technology

[0011] It can be seen from the above that the current gasification process for removing tar in the furnace is mostly realized by connecting several reactors in series, and there is no integrated biomass composite gasification device. Even if there is a so-called composite gasifier structure, it is only Simple superposition and serial connection of several devices without creativity

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