Method for self-heating pyrolysis gasification of biomass by gas backflow combustion

A technology of pyrolysis gasification and biomass, which is applied in the manufacture of combustible gas, petroleum industry, energy input, etc. It can solve the problems of difficulty in establishing an oxidation and reduction reaction balance mechanism, low gas transmission efficiency, and high nitrogen content, and achieve low content , rapid response and high gasification efficiency
CN102643676AInactive Publication Date: 2012-08-22GUANGXI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGXI UNIV
Publication Date
2012-08-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for self-heating pyrolysis gasification of biomass by gas backflow combustion includes using air and steam as gasifying agent for pyrolysis gasification of the biomass in a pyrolysis gasifier, making the steam generated by a vaporizer into super-heated steam to compensate heat for the interior of the gasifier by waste heat of produced gas, allowing part of the produced gas to flow back into the gasifier to be combusted for supplying heat for gasification, removing tar by high-temperature pyrolysis, ensuring the whole gasifier to be under high temperature, and allowing gasification of biological pyrolytic carbon and cracking of the tar to tend to be through. By the method using the waste heat of combustible gas, part of the gas flows back to supply heat required by the biomass for pyrolysis gasification, interior high temperature of the gasifier is guaranteed, reaction is accelerated, and gasifying efficiency is improved. The produced combustible gas is low-tar gas with caloric value reaching 10MJ / Nm<3>, combustion is isolated from other reactions, and accordingly operation control is facilitated.
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Description

technical field

[0001] The invention belongs to a method for pyrolysis and gasification of biomass with gas backflow combustion and self-heating. Background technique

[0002] Biomass pyrolysis gasification technology is an important way to utilize biomass energy. Biomass gasification is the process of using oxygen or oxygen-containing substances in the air as a gasification agent at high temperature to oxidize the fixed carbon of biomass into combustible gas. Using different biomass raw materials, different gasification agents (such as air, oxygen, water vapor) or operating temperature and equipment, the composition of the pyrolysis gas produced is also different. The use of pyrolysis gasification to convert wood raw materials, crop stalks or organic industrial waste into gas is of great significance for energy saving, environmental protection and pollution prevention.

[0003] The current biomass pyrolysis gasification technology mostly uses air as the gasification agent...

Claims

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