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Method for improving yield of pyrolysis coal tar of low-rank coals

A technology of coal tar and low-rank coal, which is applied in the field of improving the yield of low-rank coal pyrolysis coal tar, can solve the problems of unmentioned coal tar and low coal tar yield, shorten the production time and increase the yield rate, increase the effect of added value

Inactive Publication Date: 2015-04-01
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the above-mentioned prior art, there are following problems: in the technical process of producing coal tar by coal pyrolysis, there is no mention of the method for the pretreatment of coal samples to improve the yield of coal tar in the pyrolysis process, in the existing In the process conditions, the yield of coal tar obtained is lower by 9.2%

Method used

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  • Method for improving yield of pyrolysis coal tar of low-rank coals

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Experimental program
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Effect test

Embodiment 1

[0022] (1) Raw coal drying treatment: 50g of coal with a particle size of less than 200 meshes is vacuum-dried for 24 hours at a temperature of 80°C and a pressure of 1000Pa to obtain dry coal;

[0023] (2) Swelling treatment: Mix 30g of dry coal obtained in step (1) with a mixed solvent, swell for 0.5 hours at a temperature of 60°C and a pressure of 0.1MPa, then filter and vacuum-dry to obtain swollen coal. Among them, the ratio of the mixed solvent to the coal sample is 2, and the unit is ml / g. The mixed solvent is composed of alcohols and tetrahydrofuran. In the mixed solvent, the volume ratio of alcohols to tetrahydrofuran is 2:1, and the alcohols are methanol:ethanol : A mixture of ethylene glycol with a volume ratio of 1:1:1;

[0024] (3) Pyrolysis reaction: Under the protection of an inert gas, raise the temperature of the tube furnace to 500°C, then push 20 g of the swollen coal obtained in step (2) into the tube furnace for pyrolysis reaction, react for 0.25 hours, an...

Embodiment 2

[0033] (1) Raw coal drying treatment: 50g of coal with a particle size of less than 200 mesh is vacuum-dried for 12 hours at a temperature of 80°C and a pressure of 1000Pa to obtain dry coal;

[0034] (2) Swelling treatment: Mix 30 parts by weight of dry coal obtained in step (1) with a mixed solvent, swell for 0.5 hours at a temperature of 60°C and a pressure of 0.1 MPa, then filter and vacuum-dry to obtain swollen coal, wherein , the ratio of the mixed solvent to the coal sample is 2, the unit is ml / g, the mixed solvent is composed of alcohols and tetrahydrofuran, in the mixed solvent, the volume ratio of alcohols to tetrahydrofuran is 5:1, and the alcohols are methanol:ethanol: A mixture of ethylene glycol with a volume ratio of 1:1:3;

[0035](3) Pyrolysis reaction: Under the protection of an inert gas, raise the temperature of the tube furnace to 500°C, then push 20 g of the swollen coal obtained in step (2) into the tube furnace for pyrolysis reaction, react for 0.25 hou...

Embodiment 3

[0043] (1) Raw coal drying treatment: vacuum-dry coal with a particle size of less than 200 mesh at a temperature of 80°C and a pressure of 100 Pa for 24 hours to obtain dry coal;

[0044] (2) Swelling treatment: Mix 30 parts by weight of dry coal obtained in step (1) with a mixed solvent, swell for 0.5 hours at a temperature of 100°C and a pressure of 1.5 MPa, then filter and vacuum dry to obtain swollen coal, wherein , the ratio of the mixed solvent to the coal sample is 10, the unit is ml / g, the mixed solvent is composed of alcohols and tetrahydrofuran, in the mixed solvent, the volume ratio of alcohols to tetrahydrofuran is 8:1, and the alcohols are methanol:ethanol: A mixture of ethylene glycol with a volume ratio of 1:2:5;

[0045] (3) Pyrolysis reaction: Under the protection of inert gas, the temperature of the tube furnace was raised to 600 ° C, and then 20 g of swollen coal was pushed into the tube furnace for pyrolysis reaction. Quickly remove and cool to within 200...

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Abstract

The invention discloses a method for improving the yield of pyrolysis coal tar of low-rank coals. The method comprises the following steps: (1) drying raw coals; (2) swelling; (3) performing pyrolytic reaction; and (4) collecting coal tar. By adopting the method disclosed by the invention, on the premise that the production cost is considered, a pyrolysis process of the low-rank coals is improved to ensure that the total volatile matter yield is improved by 3-7%, the yield of the coal tar is improved by 3.4%, the added value of the low-rank coals is improved, and a pretreatment solvent can be recovered for recycling.

Description

technical field [0001] The invention relates to the production technical field of low-rank coal pyrolysis in coal chemical industry, in particular to a method for increasing the yield of low-rank coal pyrolysis coal tar. Background technique [0002] my country's coal resources are abundant, and the low-rank coal reserves account for about 53.2% of the total coal reserves. Its clean utilization has important practical significance for the sustainable development of my country's coal resources. For the development and utilization of low-rank coal, efforts should be made to realize the clean utilization of low-rank coal in accordance with the goal of circular economy in terms of saving investment, increasing product added value and reducing environmental pollution. The pyrolysis of low-rank coal can not only obtain high value-added coal tar, but also semi-coke products for blast furnace injection, gasification, ferroalloy and other industries. [0003] The coal pyrolysis proc...

Claims

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Application Information

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IPC IPC(8): C10B57/08C10B53/04C10B57/10C10G1/00
CPCC10B53/04C10B57/08C10B57/10C10G1/002
Inventor 周剑林刘伟银张欣
Owner HUNAN UNIV OF SCI & TECH
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