Biomass gasification tar removing device and method based on chemical chain reforming

A biomass and chemical chain technology, applied in gas dust removal, petroleum industry, combustible gas purification, etc., can solve the problems of easy carbon deposition, pre-reduction and regeneration difficulties, and achieve the effect of simple regeneration and elimination of carbon deposition

Active Publication Date: 2017-06-13
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a device and method for removing biomass gasification tar based on chemical chain reforming, aiming at solving the problems of easy carbon deposition and the need for pre-reduction in the existing tar removal technology and regeneration problems

Method used

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  • Biomass gasification tar removing device and method based on chemical chain reforming
  • Biomass gasification tar removing device and method based on chemical chain reforming
  • Biomass gasification tar removing device and method based on chemical chain reforming

Examples

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Effect test

Embodiment 1

[0043] Taking the removal of crude gas tar from biomass downdraft fixed bed air gasification as an example.

[0044] Raw gas from biomass downdraft fixed bed gasification 10.0 Nm 3 / h, the tar content is 2.35g / Nm 3 , the temperature is 450°C, after being separated and dedusted by the first cyclone separator and preheated by the preheater, it enters the reforming reactor and the high-temperature oxygen carrier (CuO-NiO / Al 2 o 3 , 6kg / h) reaction, the oxygen carrier is reduced, and the tar macromolecules in the raw gas are partially oxidized and catalytically reformed into CO and H 2 The tar content of the gas obtained after separation and dust removal by the third cyclone separator is 0.07g / Nm 3 , the removal rate of tar in crude gas is 97%;

[0045] The reduced oxygen carrier (there may be carbon deposits on the surface) enters the air combustion reactor, and the air excess coefficient controlling the combustion reaction of the oxygen carrier is 0.95. The reduced oxygen ca...

Embodiment 2

[0051] This method is used as an example to illustrate the removal of crude gas tar from biomass downdraft fixed bed oxygen-enriched (50v% oxygen) gasification.

[0052] Raw gas from biomass fixed bed oxygen-enriched (50v% oxygen) gasification 10.0 Nm 3 / h, the tar content is 1.02g / Nm 3 , with a temperature of 480°C. After being separated and dedusted by the first cyclone separator and preheated by the preheater, it enters the reforming reactor and the high-temperature oxygen carrier (Mn 2 o 3 -NiO / Al 2 o 3 , 5kg / h) reaction, the oxygen carrier is reduced, and the tar macromolecules in the raw gas are partially oxidized and catalytically reformed into CO and H 2 Transformation and removal of small molecular substances, the tar content of the gas obtained after passing through the third cyclone separator is 0.05g / Nm 3 , the removal rate of tar in crude gas is 95%;

[0053] The reduced oxygen carrier (there may be carbon deposits on the surface) enters the air combustion r...

Embodiment 3

[0059] This method is used as an example to illustrate the removal of crude gas tar from biomass fluidized bed air gasification.

[0060] Raw gas from biomass fluidized bed gasification 5.0 Nm 3 / h, the tar content is 11.72g / Nm 3 , with a temperature of 520°C. After being separated and dedusted by the first cyclone separator and preheated by the preheater, it enters the reforming reactor and the high-temperature oxygen carrier (Fe 2 o 3 -NiO / Al 2 o 3 , 5.4kg / h) reaction, the oxygen carrier is reduced, and the tar macromolecules in the raw gas are partially oxidized and catalytically reformed into CO and H 2 After the third cyclone separator separates and removes dust, the tar content of the gas obtained is 0.92g / Nm 3 , the removal rate of tar in crude gas is 92%;

[0061] The reduced oxygen carrier (there may be carbon deposits on the surface) enters the air combustion reactor, and the air excess coefficient controlling the combustion reaction of the oxygen carrier is 0....

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Abstract

The invention discloses a biomass gasification tar removing device and method based on chemical chain reforming. The device comprises a first cyclone separator, a preheater, a reforming reactor and an air combustion reactor which are sequentially connected, wherein the first cyclone separator is used for performing separation and dust removal on biomass gasification crude gas, the preheater is used for preheating the biomass gasification crude gas, the reforming reactor is used for subjecting the preheated biomass gasification crude gas and an oxygen carrier to a reforming reaction, the air combustion reactor is used for subjecting the oxygen carrier after the reforming reaction and air to a combustion reaction, a second cyclone separator for performing separation and dust removal on the oxidized oxygen carrier is connected between the reforming reactor and the air combustion reactor, and a third cyclone separator for performing separation and dust removal on the reacted gas is also connected with the reforming reactor. Tar macromolecules are partially oxidized into micromolecular substances such as CO, H2 and the like under the lattice oxygen and catalytic action of the oxygen carrier; the oxygen carrier is recycled between the reforming reactor and the combustion reactor, and regeneration of the oxygen carrier is simple.

Description

technical field [0001] The invention relates to the technical fields of energy and chemical industry, in particular to a device and method for removing tar from biomass gasification based on chemical loop reformation. Background technique [0002] Biomass is a resource-rich renewable energy source. The high volatile content of biomass (about 70%) determines that its gasification utilization method has economic and technical advantages. Biomass gasification technology can be connected with subsequent units such as synthetic liquid fuel, power generation, heat supply and production of chemical products, so as to realize clean, efficient and diversified utilization of biomass resources. However, no matter the biomass gasification technology using air, water vapor or oxygen, or fixed bed or fluidized bed reactor, the gas contains more tar by-products due to the high volatility of biomass, and the tar at high temperature is Gaseous, but condenses to liquid below about 200°C. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/02C10K1/00
CPCC10K1/002C10K1/026
Inventor 王志奇朱敏吴晋沪何涛张金芝武景丽杨静
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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