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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

Inactive Publication Date: 2012-08-22
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current biomass pyrolysis gasification technology mostly uses air as the gasification agent. The obtained pyrolysis gas has high nitrogen content, low calorific value, and low fuel gas transmission efficiency. It needs to be further processed as syngas
[0004] Most of the disclosed biomass gasifiers are self-heating. The common problem in self-heating biomass gasifiers is that it is difficult to establish a balance mechanism between oxidation and reduction reactions to maintain stable reaction conditions and reaction bed layers.
Only a few gasifiers separate the combustion and gasification processes. For example, the combustion bed of a double fluidized bed gasifier uses a bubbling bed, and the gasification bed uses a circulating fluidized bed. The heat transfer between the two beds relies on heat carriers, but How to control the circulation speed and heating temperature of the heat carrier is a key issue that has not yet been well resolved.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use fast-growing eucalyptus as raw material to produce combustible gas.

[0025] 1. Crush the fast-growing eucalyptus branches with a crusher and sort them to obtain materials with a size of 2-5mm.

[0026] 2. Before the formal start of the experiment, the gasifier first goes through the start-up phase, and charcoal and coke are used as starting materials in the start-up phase. Two tasks need to be completed in the start-up phase: first, to raise the temperature of the temperature measuring point of the gasifier to: the temperature of the first temperature measuring point at the bottom of the gasifier is > 1100°C, and the third from the top of the gasifier The temperature at the temperature measuring point is >650°C; secondly, the preparation of water vapor required by the gasification furnace is completed.

[0027] 3. Pour 162 kg of crushed and screened fast-growing eucalyptus into the hopper 8 one after another, and use a frequency converter to adjust the frequency o...

Embodiment 2

[0037] 1. Crush cassava stalks with a crusher and sort them to obtain 162kg of 1-3mm materials.

[0038] 2. The start-up and gas production stages of the gasifier are the same as in Example 1.

[0039] 3. Experimental results

[0040] Gas production is 252.7m 3 , the obtained combustible gas component content is shown in Table 3.

[0041] Table 3 Contents of combustible gas components

[0042]

[0043] 4. Gasification index

[0044] The gasification index of the experiment is shown in Table 4

[0045] Table 4 Gasification indicators

[0046]

[0047]

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/20C10J3/66C10J3/84
CPCY02P20/129
Inventor 黄世钊冼萍周航陈伟强李晓春
Owner GUANGXI UNIV
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