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Apparatus for preparing coal gas by using bulky biomass materials

A biomass raw material and gas technology, which is applied in the device field of the process, can solve the problems of unsatisfactory use effect of fluffy biomass raw materials, complex furnace structure, and secondary pollution of the environment, so as to reduce the amount of fly carbon and facilitate construction , the effect of high production intensity

Inactive Publication Date: 2006-10-11
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic biomass gasification generally adopts a downdraft gasifier, which is more effective for the gasification of dense biomass raw materials, but not ideal for fluffy biomass raw materials.
For powdery materials such as sawdust and wood powder, there are reports of using an external circulating fluidized bed gasifier, but there are defects such as complex furnace structure and poor stability.
The purification of gas generally adopts wet process, and a large amount of tar-containing sewage is produced during the purification process, causing secondary pollution to the environment

Method used

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  • Apparatus for preparing coal gas by using bulky biomass materials
  • Apparatus for preparing coal gas by using bulky biomass materials
  • Apparatus for preparing coal gas by using bulky biomass materials

Examples

Experimental program
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Effect test

Embodiment 1

[0036] combined with figure 1 , 2, 3, the technique of the present invention is: fluffy type biomass raw material is pulverized into the fragment of 8-10mm with pulverizing device, is added into hopper 2 by lifting screw 1, is sent into built-in fast fluidized bed gas by screw feeder 3 again. The lower part of the gasification furnace 4; air is sent into the furnace from the air inlet 27, and the gasification reaction temperature is controlled at 800°C to 900°C by adjusting the amount of gasification air and the feeding speed of raw materials, and the amount of gasification air (Nm3) and raw material are controlled. The ratio of addition amount (kg) is 1.15. The fluidization gas velocity in the gasifier is 2.5m / s, and the biomass raw material is boiling in the gasifier and undergoes partial redox reaction with the gasification medium (air) to generate coal gas. The coal gas entrained with solid materials and ash enters the built-in cyclone separator 20, and the solid materia...

Embodiment 2

[0038] combined with figure 1 , 4 , 5, the technique of the present invention is: fluffy biomass raw material is pulverized into 3-5mm fragment with crushing device, is added into hopper 2 by lifting screw 1, is sent into built-in fast fluidized bed gas by screw feeder 3 again. The lower part of the gasification furnace 4; air is sent into the furnace from the air inlet 27, and the gasification reaction temperature is controlled at 700°C to 800°C by adjusting the amount of gasification air and the feeding speed of raw materials, and the amount of gasification air (Nm3) and raw material are controlled. The ratio of addition amount (kg) is 1.05. The fluidization gas velocity in the gasifier is 1.4m / s, and the biomass raw material is boiling in the gasifier and undergoes partial redox reaction with the gasification medium (air) to generate coal gas. The gas entrained with solid materials and ash enters the built-in cyclone separator 20, and the solid materials captured by the c...

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Abstract

The invention discloses a process and device for preparing coal gas using fluffy biomass raw materials. The process includes raw material pretreatment, raw material gasification, slag separation, gas purification, and gas transportation steps; the device includes a raw material pretreatment system, a gas generation system, a gas purification system, and a gas transportation and storage system. The built-in rapid fluidized bed gasifier used in the present invention has the characteristics of high production intensity, high gasification efficiency, low gas tar content, and good operating stability. The gasification reaction is completed at pneumatic conveying speed, and the built-in separator realizes rapid circulation of biomass raw materials in the gasification furnace. The gas purification method uses a combination of water washing and organic solvent washing, which has a high tar removal rate and a low tar content in the gas. Characteristics include small changes and fluctuations. The process and equipment of the present invention can continuously gasify fluffy biomass raw materials, and the gas generated by gasification can be used as a gas source for gas generators, and can also be used to supply gas to surrounding residential users through the pipeline network.

Description

technical field [0001] The invention relates to a process and equipment for preparing gas from biomass raw materials, in particular to a process for preparing gas from fluffy biomass raw materials, and also relates to a device for the process. Background technique [0002] Biomass in a broad sense refers to hydrocarbons produced by photosynthesis. According to the texture of biomass raw materials, biomass raw materials can be divided into two types: dense type and fluffy type: dense type biomass raw materials mainly include forest logging residues, sorghum, corn, cotton and other crop straws, and fluffy type biomass raw materials It mainly includes agricultural straw such as rice straw, wheat straw, and rice husk. my country is a large agricultural country, and the crops are mainly wheat and rice, so the fluffy biomass raw materials account for a considerable proportion of my country's biomass resources. [0003] How to efficiently and rationally develop and utilize fluffy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/46C10J3/48C10B53/02
Inventor 张进平乔旭崔咪芬汤吉海
Owner NANJING TECH UNIV
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