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Method and device for preparing low-tar combustible gas through biomass gasification

A technology of biomass coke and biomass, which is applied in the manufacture of combustible gas, granular/powdered fuel gasification, petroleum industry, etc. It can solve the problems of not involving catalytic active substances, low equipment processing efficiency, low carbon layer reactivity, etc. problem, to achieve the effects of compensating for low heat conduction rate, improving heterogeneous reaction activity, and simple structure

Active Publication Date: 2010-12-08
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

The pyrolysis reaction speed of this method is slow, and the reactivity of the carbon layer is not high at the same time, so that the equipment processing efficiency is not high
[0004] None of the above patents involve the use of microwaves to activate biomass coke and catalytically active substances in the coke produced by biomass gasification to promote secondary reactions, crack gasification tar, and produce low-tar content combustible gas

Method used

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  • Method and device for preparing low-tar combustible gas through biomass gasification
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  • Method and device for preparing low-tar combustible gas through biomass gasification

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Embodiment 1

[0034] This embodiment takes the following steps:

[0035] (1) Biomass is gasified after being crushed to obtain gasification gas products (including gasification gas and tar) and biomass coke, and the gas products and biomass coke are quickly separated;

[0036] (2) heating the biomass coke separated in step (1) into a microwave field to form a local hot spot on the surface of the biomass coke to activate the biomass coke;

[0037] (3) passing the gas product separated in the step (1) through the biomass coke layer treated in the step (2), and catalytically cracking the tar therein. And make the gasification gas and biomass coke undergo secondary reaction to generate combustible gas.

[0038] In the step (1), the biomass fine particles are carried into the cyclone gasifier 1 by the gasification medium, and the air velocity is 18m / s; the gasification temperature of the biomass gasification is 700°C; the oxygen-enriched air is O 2 The volume percentage is 100% air, and the bi...

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Abstract

The invention discloses a method and a device for preparing a low-tar combustible gas through biomass gasification. The method comprises the followings steps of: pulverizing and gasifying biomass, and rapidly separating obtained gasification gas products and biomass char; heating and activating the biomass char in a microwave field; catalytically cracking tar in the gasification gas products by introducing the gasification gas products to pass through a treated biomass char layer, and carrying out secondary reaction on the gasification gas and the biomass char to produce the combustible gas. The device comprises a spiral-flow gasifier 1, a fixed bed reactor 2 and a microwave generator 3 which are connected through ducts, and the middle part of the fixed bed reactor is connected with the microwave generator 3 through a microwave duct 11. The microwave technology is applied to tar cracking, so that the problem of low heat transfer speed due to porous and loose biomass char is solved. Meanwhile, the cracking rate of tar and the secondary reaction activity between the char and the gasification gas are increased by using the 'hot spot effect' of microwaves. The device has the advantages of strong adaptability, simple and compact structure and easy enlargement.

Description

technical field [0001] The invention relates to the technical field of biomass energy utilization, in particular to a method and device for producing combustible gas with low tar content through biomass gasification. technical background [0002] Energy crisis and environmental pollution are dual challenges facing the world today, and the rational use of biomass energy is an effective way to solve this problem. Biomass gasification can directly meet the needs of heat supply, power generation and synthetic chemical industry, which is an important direction for the development of biomass energy. In biomass pyrolysis gasification technology, tar is an inevitable by-product. The existence of tar has many adverse effects. For this reason, many researchers have proposed different methods for the treatment of tar. The catalytic cracking technology of tar can not only effectively reduce the tar content in gasification gas, but also make full use of the energy of tar. It is more ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/64C10J3/48C10J3/46C10J3/84
Inventor 赵增立李海滨王小波武宏香吴创之
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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