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System and method for preparing reducing gas and activated carbon by pyrolysis of pulverized coal and biomass

A technology of biomass pyrolysis and activated carbon, which is applied in the chemical industry, can solve problems such as the difficulty of tar utilization, and achieve the effect of improving thermal efficiency and high quality

Pending Publication Date: 2017-07-28
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Faced with the above technical problems, the present invention aims to design a pyrolysis device that integrates coal pyrolysis, biomass pyrolysis and tar catalytic cracking to generate synthesis gas, and couples it with gas purification and separation and mixed semi-coke activation to form A method and system for preparing reducing gas and activated carbon by pyrolysis of pulverized coal and biomass, in order to make full use of the heat carried by the pyrolysis gas, solve the problem of difficult utilization of tar, and realize efficient comprehensive utilization of high-temperature pyrolysis semi-coke

Method used

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  • System and method for preparing reducing gas and activated carbon by pyrolysis of pulverized coal and biomass
  • System and method for preparing reducing gas and activated carbon by pyrolysis of pulverized coal and biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0070] The pulverized middle and low rank coal powder with a particle size of ≤3mm is fed into the regenerative down-bed reactor, and runs down from the top inlet of the down-bed by gravity, and is heated by the regenerative radiant tube during the down-going process. Pyrolysis, the pyrolysis temperature is 750°C, so as to obtain raw coal gas and high-temperature semi-coke; high-temperature semi-coke is directly sent to the mixed semi-coke activation chamber through a closed heat preservation conveying device; high-temperature raw coal gas enters the biomass from the connecting member at the lower end of the insulation wall The pyrolysis zone is in direct contact with the biomass with a length ≤ 5mm, the mass ratio of the biomass to the raw coal powder is 0.6:1, the pyrolysis temperature is controlled at 650°C, and the biomass is pyrolyzed to obtain pyrolysis gas and biomass coke; the produced biomass coke is output from the bottom and sent to the mixed semi-coke activation cha...

Embodiment 2

[0072] The process for preparing reducing gas and activated carbon in this embodiment is the same as in Example 1, but the process parameters are different, as follows:

[0073] The pulverized middle and low rank coal powder with a particle size of ≤3mm is fed into the regenerative down-bed reactor, and runs down from the top inlet of the down-bed by gravity, and is heated by the regenerative radiant tube during the down-going process. Pyrolysis, the pyrolysis temperature is 850°C, so as to obtain raw coal gas and high-temperature semi-coke; high-temperature semi-coke is directly sent to the mixed semi-coke activation chamber through a closed heat preservation conveying device; high-temperature raw coal gas enters the biomass from the connecting member at the lower end of the insulation wall The pyrolysis zone is in direct contact with the biomass with a length ≤ 5mm, the mass ratio of the biomass to the raw coal powder is 1:1, the pyrolysis temperature is controlled at 700°C, ...

Embodiment 3

[0075] The process for preparing reducing gas and activated carbon in this embodiment is the same as in Example 1, but the process parameters are different, as follows:

[0076] The pulverized middle and low rank coal powder with a particle size of ≤3mm is fed into the regenerative down-bed reactor, and runs down from the top inlet of the down-bed by gravity, and is heated by the regenerative radiant tube during the down-going process. Pyrolysis, the pyrolysis temperature is 850°C, so as to obtain raw coal gas and high-temperature semi-coke; high-temperature semi-coke is directly sent to the mixed semi-coke activation chamber through a closed heat preservation conveying device; high-temperature raw coal gas enters the biomass from the connecting member at the lower end of the insulation wall The pyrolysis zone is in direct contact with the biomass with a length ≤ 5mm, the mass ratio of the biomass to the raw coal powder is 0.8:1, the pyrolysis temperature is controlled at 750°C...

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Abstract

The invention relates to a system and method for preparing reducing gas and activated carbon by pyrolyzing coal powder and biomass. The system includes a segmented heat treatment unit, a gas purification and separation unit, and a mixed semi-coke activation unit; wherein, the segmented heat treatment unit uses The regenerative down-bed reactor includes a coal pyrolysis zone, a tar catalytic cracking zone, and a biomass pyrolysis zone; the coal pyrolysis zone is provided with a pulverized coal inlet and a semi-coke outlet, and the biomass pyrolysis zone is provided with a biomass inlet and a biomass pyrolysis zone. Biomass coke outlet, tar catalytic cracking area is equipped with pyrolysis mixed gas outlet; gas purification and separation unit includes pyrolysis mixed gas inlet, synthesis gas outlet, fly ash outlet and carbon dioxide outlet; mixed semi-coke activation unit includes high-temperature mixed semi-coke inlet , carbon dioxide inlet, activated carbon outlet and activated carbon dioxide outlet. The technical scheme of the invention can make full use of the heat carried by the pyrolysis gas, solve the difficult problem of tar utilization, and realize the high-efficiency comprehensive utilization of high-temperature pyrolysis semi-coke.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a system and method for preparing reducing gas and activated carbon by pyrolyzing coal powder and biomass. Background technique [0002] Coal pyrolysis is the process of heating coal at a certain temperature and in an anaerobic environment, so as to decompose the volatile components in the coal and produce pyrolysis solids, pyrolysis gas and tar. It is a key step to realize the graded utilization of coal. . However, at present, most of the pyrolysis furnaces that process pulverized coal are for the purpose of obtaining oil products, and the pyrolysis oil contains a large amount of dust, which makes it difficult to effectively use the pyrolysis oil and is of low value; at the same time, the pyrolysis produced The heat carried in the high-temperature semi-coke and pyrolysis gas is not fully utilized, resulting in energy waste. Therefore, the prior art has the problems o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B53/00C10B57/00C10G9/00C10K1/02
CPCC10B53/04C10B53/00C10B57/00C10G9/00C10J2300/0916C10K1/02
Inventor 刘维娜丁力董宾路丙川吴道洪
Owner SHENWU TECH GRP CO LTD
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