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Method for preparing high-quality gas by biomass pyrolysis desulphurization and decarbonization

A biomass and high-quality technology, applied in biofuels, coke ovens, indirect heating and dry distillation, etc., can solve the problems of high cost in the oxygen production process, reduced system economy, reduced energy density of gas products, and easy deactivation costs of catalysts. Achieve the effects of eliminating damage and environmental pollution, wide application range, and reducing operating costs

Active Publication Date: 2013-07-17
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method avoids the problems of easy catalyst deactivation and high cost, but the high cost of the oxygen production process reduces the economy of the system
At the same time, the CO in the gas obtained by the traditional biomass pyrolysis gasification technology 2 The content of CO is relatively high, such as the CO in the synthesis gas obtained by the patent "A method and device for preparing synthesis gas by distributed oxygen-enriched oxidation of biomass" (CN 101164866A). 2 The content reaches about 20%, a large amount of CO 2 The presence of the gas reduces the energy density of the gas product and increases the energy consumption of its subsequent processing
[0004] To sum up, the existing biomass gasification pyrolysis gas production technology still has certain deficiencies in some aspects, and the economical efficiency of the process needs to be improved.

Method used

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  • Method for preparing high-quality gas by biomass pyrolysis desulphurization and decarbonization
  • Method for preparing high-quality gas by biomass pyrolysis desulphurization and decarbonization
  • Method for preparing high-quality gas by biomass pyrolysis desulphurization and decarbonization

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Using sawdust powder of about 50 mesh as raw material (moisture content 10%), firstly mix it evenly with calcium oxide powder (about 100 mesh) of 0.7 times the mass, after mixing, add the quantitative feeder 1 into the jacketed pyrolyzer 3, and Biomass pyrolysis and calcium oxide absorb CO at 600-700°C 2Cooperate with the catalytic tar cracking reaction for 10-20 minutes; the pyrolysis gas is separated from solid phase substances such as pyrolysis residual carbon and calcium carbonate at the tail of the jacketed pyrolyzer 3, and then purified by the dust collector 4, and then passed through the combustion chamber 10 high temperature zone, the tar macromolecules in the pyrolysis gas undergo secondary cracking at 900-1000°C, and the obtained gas tar content is 40 mg / Nm 3 Below, the approximate range of each gas volume content is H 2 41%, CH 4 27%, CO 16%, CO 2 3.5%, the calorific value of gas reaches 17MJ / Nm 3 ; The high-quality gas obtained is finally collected an...

Embodiment 2

[0027] About 50 mesh wood powder (water content 10%) and 0.5 times the mass of calcium oxide powder (about 100 mesh) are mixed evenly and added to the pyrolyzer. The other steps are the same as in Example 1 and will not be repeated. mg / Nm 3 Below, the approximate range of each gas volume content is H 2 38%, CH 4 28%, CO 20%, CO 2 4.5%, the calorific value of gas reaches 17.3MJ / Nm 3 .

Embodiment 3

[0029] About 80 mesh of rice husk powder (water content 11%) and 0.3 times the mass of calcium oxide powder (about 100 mesh) are mixed evenly and added to the pyrolyzer. Other steps are the same as in Example 1 and will not be repeated. The amount of gas tar obtained is 45mg / Nm 3 Below, the approximate range of each gas volume content is H 2 30%, CH 4 27%, CO 25%, CO 2 6.5%, the calorific value of gas reaches 16.9MJ / Nm 3 .

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Abstract

A method for preparing high-quality gas by pyrolysis, decoking and decarburization of biomass, which is characterized in that it consists of the following steps: (1) adding biomass raw materials and calcium oxide into a jacketed pyrolyzer in proportion to carry out biomass pyrolysis pyrolysis, tar catalytic cracking and calcium oxide absorbing CO2 reaction; (2) The gas phase product produced by pyrolysis passes through the combustion chamber, and is indirectly heated at a temperature of 900-1000 ° C, and the tar is further cracked to obtain high-quality gas; (3) The residual carbon and calcium carbonate produced by pyrolysis are transported to the combustion chamber by the conveying device for combustion, and the heat generated by combustion is used for the decomposition of calcium carbonate; (4) The flue gas produced by combustion carries regenerated calcium oxide into the cyclone separator, and the gas-solid The separated high-temperature flue gas enters the jacketed pyrolyzer interlayer to provide heat for pyrolysis and tar cracking reactions, while the regenerated calcium oxide is sent back to the jacketed pyrolyzer for recycling. The process is simple, and it can operate continuously to obtain high-quality gas that can be used for various purposes.

Description

technical field [0001] The invention relates to a method for preparing high-quality gas by pyrolysis, decoking and decarburization of biomass, and belongs to the field of thermochemical transformation of biomass. Background technique [0002] Compared with fossil energy, biomass energy is clean, environmentally friendly and renewable. The utilization of biomass energy will be of great significance to alleviate the shortage of energy supply and the deteriorating environment. Biomass pyrolysis gasification technology to produce gas is an important way of thermal conversion and utilization of biomass energy. Traditional biomass pyrolysis gasification technology produces gas that is mainly used to drive gas turbines to generate power and electricity, or for civil use Cooking, industrial kiln combustion, but these uses are affected by the by-product tar and CO in the pyrolysis process of biomass 2 The presence of tar not only reduces the pyrolysis efficiency, but also seriously ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/02C10B57/00C10B57/06C10B57/18C10B47/00
CPCY02E50/10
Inventor 赵保峰张晓东孙立陈雷孟光范伊晓路
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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