Method and device for mixed flow type gasification of biomass

A gasification device and a mixed-flow technology, which are applied in the field of biomass mixed-flow gasification methods and devices, can solve the problems of high tar content, poor economy and low strength of downdraft gasification, etc. The effect of strong regulation ability, strong load adaptability and strong scale amplification ability

Inactive Publication Date: 2011-10-26
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0005] The Chinese invention patent with the authorized publication number CN101164866A discloses a method and device for producing syngas by step-by-step oxygen-enriched oxidation of biomass, using two series-connected reactors to separate the two processes of pyrolysis and downdraft gasification , can indeed reduce the tar content in the synthesis gas, but because the pyrolysis reactor needs an external heat source, the operating cost is high, the economy is poor, and the shortcoming of the low production intensity of the downdraft gasification is not solved, it is difficult to be really applied in practice in production
[0006] At present, the improvement of the fixed bed gasification process is mostly the simple separation or combination of gasification equipment, but few changes are made to the key characteristics of the downdraft and updraft gasification, and the downdraft gasification cannot be solved well. Problems with low strength and high tar content in updrafts, so not very practical

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  • Method and device for mixed flow type gasification of biomass
  • Method and device for mixed flow type gasification of biomass
  • Method and device for mixed flow type gasification of biomass

Examples

Experimental program
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Embodiment 1

[0039] Wood chips with an average particle size of about 50mm are used as raw materials, and are fed into the downdraft gasification section 4 through the feeding device 1, and the feeding speed is about 300-350kg / h. Air is blown in at a flow rate of 240Nm 3 / h and 100Nm 3 / h or so. The wood chips are pyrolyzed and gasified in the downdraft gasification section 4, and the temperature in the middle of the gasification section is 730-800°C; the wood chips are converted into biomass coke after passing through the downdraft gasification section, and the unreacted biomass coke enters the The updraft gasification section continues to gasify, and the temperature in the middle of the gasification section is 750-830°C; the gas outlet temperature of the gasification process is 330-400°C, and the approximate range of each component of the gas is: 11.7-12.8vol%H 2 , 19.6~24.0vol%CO, 8.3~10.6vol%CO 2 , 1.2~1.5vol%CH 4 , 0.4~0.7vol%C 2 h m , 45.7~51.1vol%N 2 , the calorific value of ...

Embodiment 2

[0041] In the same gasification device as in Example 1, wood chips are used as raw materials, the feeding rate is about 550-600 kg / h, and the air flow rates in the up and down suction gasification sections are respectively 400 Nm 3 / h and 180Nm 3 / h, the obtained temperature distribution and gas composition are basically the same as in Example 1.

Embodiment 3

[0043] Enlarge the gasification device in Example 1, increase the feeding rate of wood chips to 1500-1600kg / h, increase the gasification agent in the same proportion as in Example 1, and other steps are similar to Example 1. The temperature distribution and gas composition obtained by gasification It is basically the same as Example 1.

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Abstract

The invention discloses a method and device for mixed flow type gasification of biomass. The gasification process comprises a front gasification stage and a post gasification stage. In the front gasification stage, the biomass material is subjected to pyrolysis gasification by using a bottom feed type gasification process, in the post gasification stage, the biomass material is subjected to pyrolysis gasification by using a top feed type gasification process, so that the biomass coke that does not completely react in the front gasification stage and part of fuel gas together enter a top feed type gasification device for gasification reaction. By using the method and the device disclosed by the invention, the bottom feed type gasification process and the top feed type gasification process are optimally combined to fully play the advantages of the two gasification processes. Meanwhile, the method and the device have the characteristics of low tar content, strong gas component regulation and control capacity, strong load adapting capacity, stability in operation and so on, have strong scale-up capacity, and can be widely used in gas supply, heat supply, power generation, liquid fuel synthesis and other fields.

Description

technical field [0001] The invention relates to the field of biomass thermochemical conversion, in particular to a biomass mixed-flow gasification method and device. Background technique [0002] my country's biomass resource reserves are very rich. As a clean and environmentally friendly renewable energy, its use can effectively reduce the pressure on the demand for fossil fuels that are increasingly depleted, and at the same time slow down the increasingly serious environmental problems caused by the extensive use of fossil fuels. Biomass gasification can convert biomass into combustible gas, which can be used for gas supply, heat supply, power generation or synthesis of liquid fuel. It is one of the important technologies for biomass utilization and has broad application prospects. [0003] The gasifier is the core equipment in the biomass gasification process. At present, the commonly used biomass gasifiers at home and abroad mainly include fluidized bed gasifiers (inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/20C10J3/66C10J3/72
CPCC10J3/20C10J3/24C10J3/26C10J2300/0916C10J2300/092C10J2300/0956Y02E50/10Y02P20/145
Inventor 吴创之潘贤齐周肇秋苏德仁阴秀丽
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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