Method for improving coal pyrolysis tar yield by catalytically de-polymerizing low-rank coal

A technology of tar yield and catalytic depolymerization, which can be used in coke ovens, petroleum industry, special forms of dry distillation, etc., and can solve the problems of high cost, difficult separation, and complicated operation.

Active Publication Date: 2021-04-27
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of complicated operation, high cost and difficult separation in the existing low-rank coal pyrolysis technology, and provides a method for catalytically depolymerizing low-rank coal to increase the yield of coal pyrolysis tar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of the catalyst: Weigh 3g of NaOH and 2g of Ni(NO 3 ) 2 A mixed solution was prepared, 10 g of activated carbon was added to the mixed solution and impregnated at room temperature for 15 h, then moved into a vacuum oven to dry at 100 °C for 18 h, and then calcined at 400 °C for 4 h to obtain a carbon-based catalyst.

[0025] (2) Depolymerization of coal: add 40g of lignite of 100 meshes, 40g of water, and 1.5g of carbon-based catalyst into the reactor and mix evenly, then pass CH into the reactor 4 :H 2 :CO 2 : The volume ratio of CO is 15%: 15%: 10%: 60% of the mixture of coke oven gas and gasification gas, so that the pressure in the reactor reaches 4MPa, set the temperature of the reactor to 300°C, and at this temperature Under reaction 40min. After the reaction is finished, the reactor is cooled to room temperature, and the solid and liquid in the reactor are separated. The separated solid is depolymerized coal, and its caking index reaches 90. ...

Embodiment 2

[0028] (1) Preparation of the catalyst: weigh 2g of NaOH and 1g of Ni(NO 3 ) 2 A mixed solution was prepared, 8g of activated carbon was added to the mixed solution and impregnated at room temperature for 12h, then moved into a vacuum oven to dry at 80°C for 20h, and then calcined at 500°C for 3h to obtain a carbon-based catalyst.

[0029] (2) Depolymerization of coal: add 60g of 100 mesh long-flame coal, 70g of water, and 4g of carbon-based catalyst into the reactor and mix evenly, and then pass CH into the reactor 4 :H 2 :CO 2 : The volume ratio of CO is 15%: 17%: 3%: 65% of the mixed gas of coke oven gas and gasification coal gas, so that the pressure in the reactor reaches 4.5MPa, and the temperature of the reactor is set at 320°C, and at this React at high temperature for 30 minutes. After the reaction, the reactor was cooled to room temperature, and the solid and liquid in the reactor were separated. The separated solid was depolymerized coal with a caking index of 8...

Embodiment 3

[0032] (1) Preparation of catalyst: Weigh 2.5g of NaOH and 1.5g of Ni(NO 3 )2 A mixed solution was prepared, 9g of activated carbon was added to the mixed solution and impregnated at room temperature for 20h, then moved into a vacuum oven to dry at 110°C for 15h, and then calcined at 450°C for 4h to obtain a carbon-based catalyst.

[0033] (2) Depolymerization of coal: Add 50g of 100-mesh non-caking coal, 65g of water, and 3g of carbon-based catalyst into the reactor and mix evenly, and then pass CH into the reactor 4 :H 2 :CO 2 : The volume ratio of CO is 7%: 20%: 3%: 70% of the mixture of coke oven gas and gasification gas, so that the pressure in the reactor reaches 4MPa, set the temperature of the reactor to 330 ° C, and at this temperature Under reaction 40min. After the reaction, the reactor was cooled to room temperature, and the solid and liquid in the reactor were separated. The separated solid was depolymerized coal with a caking index of 60.

[0034] (3) Pyrolys...

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Abstract

The invention discloses a method for improving coal pyrolysis tar yield by catalytically de-polymerizing low-rank coal, belongs to the field of comprehensive utilization of low-rank coal, and aims to improve the yield and quality of low-rank coal pyrolysis tar so as to realize efficient utilization of low-rank coal. The method comprises the following steps: uniformly mixing low-rank coal, water and a catalyst in proportion in a reaction kettle, introducing a mixed gas of coke-oven gas and gasified coal gas, modulating a coal structure by utilizing methyl free radicals CH3. and active hydrogen H. generated by CH4-CO2/CH4-H2O reforming reaction and water-gas shift reaction, hydrogenating low-rank coal, meanwhile, obtaining de-polymerized coal at the optimized reaction temperature, pressure and time; and introducing the de-polymerized coal into a carbonization furnace for pyrolysis to obtain semi-coke/coke and high-yield tar. A large number of medium and small molecular substances are generated in the prepared de-polymerized coal and escape in the form of volatile components in the pyrolysis process, so that the pyrolysis tar yield is increased, and the tar quality is improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of low-rank coal, and in particular relates to a method for improving the yield of coal pyrolysis tar by catalytically depolymerizing low-rank coal. Background technique [0002] my country's low-rank coal resources are rich in reserves, accounting for more than 50% of my country's coal reserves. The third national coal field forecast by the State Administration of Coal Geology shows that my country's low-rank coal resources with a vertical depth of 2,000 meters are 2611.816 billion tons, accounting for the country's total coal resources. 57.38% of predicted reserves. However, due to the disadvantages of low-rank coal such as lignite, such as high volatile matter, high water content, low calorific value, flammability and fragility, and difficulty in long-distance transportation, its application is greatly restricted. [0003] By pyrolysis and upgrading of low-rank coal, products ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B57/08
CPCC10B53/04C10B57/08
Inventor 赵钰琼刘瑞何守琪魏永永徐昕逸安娜张国杰张永发
Owner TAIYUAN UNIV OF TECH
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