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System and method for treating direct coal liquefaction residues

A technology for direct coal liquefaction and residue, which is applied in the preparation of liquid hydrocarbon mixtures, gasification of granular/powdered fuels, special forms of dry distillation, etc., can solve the problems of insufficient utilization of coal direct liquefaction residues, etc., to improve yield and increase Economical effect

Pending Publication Date: 2021-06-25
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the purposes of the present invention is to overcome the insufficient utilization of coal direct liquefaction residue in the prior art;

Method used

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  • System and method for treating direct coal liquefaction residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] The coal direct liquefaction residue (50kg / h) and crushed and dried raw coal (50kg / h, particle size 10mm) are mixed into the co-pyrolysis unit 1, co-pyrolyzed at 550°C and normal pressure to produce tar (18kg / h), co-pyrolysis solid products, gas (800Nm 3 / h, where CO and H 2 content accounts for 52% of the total gas volume).

[0114] In the extraction unit 2, the co-pyrolysis solid product is mixed with the extractant (tetrahydrofuran) at a solid-to-liquid mass ratio of 1:5, and extracted at normal pressure and 200°C to obtain an extract and a solid-liquid mixture.

[0115] In the solid-liquid separation unit 3, the solid-liquid mixture is subjected to solid-liquid separation to obtain a raffinate (61.5kg / h) and a small amount of filtrate. The tar, extract and filtrate are introduced into the oil product deep processing unit 8 for processing to obtain refined oil (27.6kg / h).

[0116] The raffinate is mixed with the crushed and dried raw coal at a mass ratio of 1:12,...

Embodiment 2

[0120] The coal direct liquefaction residue (50kg / h) and crushed and dried raw coal (200kg / h, particle size 10mm) are mixed into the co-pyrolysis unit 1, and co-pyrolysis is carried out under the conditions of 500°C and normal pressure to produce tar ( 34.5kg / h), co-pyrolysis solid products and gas (3000Nm 3 / h, CO and H in the gas 2 content accounts for 54% by volume of the total amount of gas).

[0121] In the extraction unit 2, the co-pyrolysis solid product is mixed with the extractant (tetrahydrofuran) at a solid-to-liquid mass ratio of 1:6, and extracted at normal pressure and 300°C to obtain an extract and a solid-liquid mixture.

[0122] In the solid-liquid separation unit 3, the solid-liquid mixture is subjected to solid-liquid separation to obtain a raffinate (173.6kg / h) and a small amount of filtrate. The tar, extract and filtrate are introduced into the oil product deep processing unit 8 for processing to obtain refined oil (48.2kg / h).

[0123] The raffinate is ...

Embodiment 3

[0127] The coal direct liquefaction residue (50kg / h) and crushed and dried raw coal (450kg / h, particle size 10mm) are mixed into the co-pyrolysis unit 1, co-pyrolyzed at 600°C and normal pressure to produce tar (60kg / h), co-pyrolysis solid products, gas (7600Nm 3 / h, where CO and H 2 content accounts for 56% of the total gas volume);

[0128] In the extraction unit 2, the co-pyrolysis solid product is mixed with the extractant (tetrahydrofuran) at a solid-to-liquid mass ratio of 1:8, and extracted at normal pressure and 250°C to obtain an extract and a solid-liquid mixture.

[0129] In the solid-liquid separation unit 3, the solid-liquid mixture is subjected to solid-liquid separation to obtain a raffinate (296kg / h) and a small amount of filtrate. The tar, extract and filtrate are introduced into the oil product deep processing unit 8 for processing to obtain refined oil (164kg / h).

[0130] Mix the raffinate with the crushed and dried raw coal in a mass ratio of 1:2, and e...

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Abstract

The invention relates to a direct coal liquefaction residue treatment process, in particular to a system and a method for treating direct coal liquefaction residues. The system comprises: a co-pyrolysis unit, which is used for pyrolyzing a mixture of direct coal liquefaction residues and raw coal to obtain a co-pyrolysis solid product; an extraction unit, which is used for extracting the co-pyrolysis solid product to obtain liquid extract and a solid-liquid mixture; a solid-liquid separation unit, which is used for carrying out solid-liquid separation on the solid-liquid mixture to obtain a raffinate; a grinding unit, which is used for drying and grinding the raffinate and the raw coal to obtain a first powdery mixture; and a gasification unit, which is used for gasifying the first powdery mixture. According to the system and the method disclosed by the invention, the direct coal liquefaction residues are deeply processed, and more high-added-value oil products and synthesis gas products can be obtained through a co-pyrolysis / extraction / grinding / gasification process, so the direct coal liquefaction residues are fully recycled and utilized.

Description

technical field [0001] The invention relates to a process for treating coal direct liquefaction residue, in particular to a system and method for treating coal direct liquefaction residue. Background technique [0002] Coal direct liquefaction, one of the coal liquefaction methods, is the process of converting coal into liquid fuel through hydrocracking under the action of hydrogen and catalyst. In the direct coal liquefaction process, in addition to obtaining the required liquefied products, some hydrocarbon molecules, CO x Such as gas, process water and liquefaction residue generated in the solid-liquid separation process (also known as coal direct liquefaction residue). [0003] Coal direct liquefaction residue is a solid hazardous waste, mainly containing inorganic substances and organic substances, organic substances include liquefied heavy oil, bituminous substances and unconverted coal, inorganic substances include minerals in coal and external catalysts . [0004]...

Claims

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Application Information

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IPC IPC(8): C10G1/00C10B53/00C10J3/48
CPCC10G1/00C10J3/485C10B53/00
Inventor 彭宝仔刘臻李烨
Owner CHNA ENERGY INVESTMENT CORP LTD
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