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System and method for treating direct coal liquefaction residues

A technology for direct liquefaction of coal and residues, which is applied in the preparation of liquid hydrocarbon mixtures, the production of bulk chemicals, and the gasification of granular/powdered fuels. Improve gasification process efficiency and syngas production, high oil recovery, and efficient recovery

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] The purpose of the present invention is to provide a system and method for dealing with direct coal liquefaction residues in order to overcome the problems in the prior art such as low oil extraction rate of coal direct liquefaction residue and insufficient utilization of residue raffinate

Method used

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  • System and method for treating direct coal liquefaction residues

Examples

Experimental program
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Effect test

Embodiment 1

[0110] Mix the coal direct liquefaction residue (150kg / h) with n-pentane at a solid-to-liquid mass ratio of 1:4, and conduct supercritical extraction in supercritical extraction unit 1 at 200°C and 4MPa to obtain the extract and solid-liquid mixture.

[0111] The solid-liquid mixture is subjected to solid-liquid separation in the solid-liquid separation unit 2 to obtain raffinate (83.5kg / h) and filtrate, and the extract and filtrate are further processed to obtain refined oil (64.5kg / h).

[0112] Mix the raffinate and raw coal at a mass ratio of 1:12, enter the coal grinding unit 3, and blow hot air during the grinding process. The inlet temperature of the hot air is 180°C, and the outlet temperature of the hot air is 50°C. The required inlet hot air volume for the processing capacity is 3Nm 3 , the pressure difference between the inlet and outlet of the hot air was 1200Pa, and the first powdery mixture was obtained (the total water content was 2.3%, and the volume content of...

Embodiment 2

[0116] Mix the coal direct liquefaction residue (200kg / h) with isopentane at a solid-to-liquid mass ratio of 1:5, and perform supercritical extraction in supercritical extraction unit 1 at 200°C and 5MPa to obtain the extract and solid-liquid mixture.

[0117] The solid-liquid mixture is subjected to solid-liquid separation in the solid-liquid separation unit 2 to obtain raffinate (102.5kg / h) and filtrate, and the extract and filtrate are processed to obtain refined oil (91kg / h).

[0118] The raffinate is mixed with raw coal (according to the mass ratio of 1:7), enters the coal grinding unit 3, and blows hot air during the pulverization process, the inlet temperature of the hot air is 200°C, and the outlet temperature of the hot air is 80°C. The inlet hot air volume required for every 1kg of processing capacity is 2Nm 3 , the pressure difference between the inlet and outlet of the hot air was 1000 Pa, and the first powdery mixture was obtained (the total water content was 2.1...

Embodiment 3

[0122] Mix the coal direct liquefaction residue (250kg / h) with n-hexane at a solid-to-liquid mass ratio of 1:4, and perform supercritical extraction in supercritical extraction unit 1 at 250°C and 4MPa to obtain the extract and solid-liquid mixture .

[0123] The solid-liquid mixture is subjected to solid-liquid separation in the solid-liquid separation unit 2 to obtain a raffinate (131.5kg / h) and a filtrate, and the extract and the filtrate are processed to obtain a refined oil (115kg / h).

[0124] The raffinate and raw coal are mixed at a mass ratio of 1:5, and enter the coal grinding unit 3, and blow hot air during the pulverization process. The inlet temperature of the hot air is 150°C, and the outlet temperature of the hot air is 40°C. The outlet temperature is 50°C, and the inlet hot air volume required for every 1kg of processing capacity is 2Nm 3 , the pressure difference between the inlet and outlet of the hot air was 800 Pa, and the first powdery mixture was obtained...

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Abstract

The invention relates to the field of direct coal liquefaction residue treatment, in particular to a system and a method for treating direct coal liquefaction residues. The system comprises: a supercritical extraction unit, which is used for extracting the direct coal liquefaction residues to obtain an aqueous 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 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, high value-added oil products in the direct coal liquefaction residues are efficiently recovered, the gasification efficiency and the yield of synthesis gas are improved, the emission of sulfides and nitrides is reduced, the direct coal liquefaction residues are treated, and the emission of wastes is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the field of coal direct liquefaction residue treatment, 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): C10G1/00C10J3/48
CPCC10G1/00C10J3/485Y02P20/54
Inventor 彭宝仔刘臻方薪晖安海泉
Owner CHNA ENERGY INVESTMENT CORP LTD
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