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Method for cooling direct coal liquefaction residues

A technology of coal direct liquefaction and cooling method, which is applied in the field of coal processing, can solve the problems of polluting waste water and reducing energy consumption, and achieve the effects of reducing consumption and avoiding coal pollution of industrial waste water

Active Publication Date: 2018-06-01
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to overcome the defect that the method of the prior art cannot solve the problem of how to reduce energy consumption during the cooling and molding process of the residue discharged from the bottom of the vacuum tower, and provide a method that can recover a large amount of heat released during the cooling process of the high-temperature residue , and significantly reduce the consumption of cooling water, and avoid the cooling method of coal direct liquefaction residue that pollutes waste water

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  • Method for cooling direct coal liquefaction residues

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specific Embodiment approach 1

[0047] Cooling methods for coal direct liquefaction residue include:

[0048] (1) first cooling the vacuum residue from the bottom of the vacuum tower of direct coal liquefaction to a first temperature, the first cooling is performed by indirect contact of the vacuum residue with water, and the first temperature is higher than At the softening point of the decompression residue, at least part of the water forms low-pressure steam after the first cooling;

[0049] (2) secondly cooling the decompression residue obtained after the first cooling to a second temperature, the second cooling being performed by contacting the decompression residue obtained after the first cooling with solidified decompression residue, The second temperature is below 80°C, more preferably 10-65°C.

specific Embodiment approach 2

[0050] Cooling methods for coal direct liquefaction residue include:

[0051] (1) first cooling the vacuum residue from the bottom of the vacuum tower of direct coal liquefaction to a first temperature, the first cooling is performed by indirect contact of the vacuum residue with water, and the first temperature is higher than At the softening point of the decompression residue, at least part of the water forms low-pressure steam after the first cooling;

[0052] (2) second cooling the decompression residue obtained after the first cooling to a second temperature, the second cooling is performed by contacting the decompression residue obtained after the first cooling with a cooling gas, and the first cooling The second temperature is below 80°C, more preferably 10-65°C.

specific Embodiment approach 3

[0053] Cooling methods for coal direct liquefaction residue include:

[0054] (1) first cooling the vacuum residue from the bottom of the vacuum tower of direct coal liquefaction to a first temperature, the first cooling is performed by indirect contact of the vacuum residue with water, and the first temperature is higher than At the softening point of the decompression residue, at least part of the water forms low-pressure steam after the first cooling;

[0055] (2) The decompression residue obtained after the first cooling is subjected to a second cooling to a second temperature, and the second cooling is carried out by contacting the decompression residue obtained after the first cooling with cooling gas and solidified decompression residue However, the second temperature is below 80°C, more preferably 10-65°C.

[0056] That is to say, the aforementioned embodiment 1-3 of the present invention adopts the cooling method of the coal direct liquefaction residue of the two-sta...

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Abstract

The invention relates to the field of coal processing and discloses a method for cooling direct coal liquefaction residues. The method comprises the following steps: (1) vacuum residues from the bottom of a vacuum tower for direct coal liquefaction are subjected to first cooling to a first temperature, the first cooling is performed by indirect contact of the vacuum residues with a first cooling medium, and the first temperature is higher than the softening point of the vacuum residues; (2) the vacuum residues subjected to first cooling are subjected to second cooling to a second temperature,the second cooling is performed by contact of the vacuum residues subjected to first cooling with a second cooling medium which is different from the first cooling medium, and the second temperature is lower than the solidification temperature of the vacuum residues. The method for cooling the direct coal liquefaction residues has remarkable energy-saving and water-saving effects, and consumptionof utilities such as cooling water and the like can be reduced greatly. Besides, industrial wastewater cannot be produced with the method.

Description

technical field [0001] The invention relates to the field of coal processing, in particular to a cooling method for coal direct liquefaction residue. Background technique [0002] The direct coal liquefaction residue is a non-target product of the direct coal liquefaction process, accounting for about 30% of the coal input. It is a high ash, high sulfur and high calorific value material mainly composed of non-distillate liquefied oil, bitumen, unconverted coal and inorganic matter. Non-distillate liquefied oil and bitumen account for about 50% of the direct coal liquefaction residue, mainly composed of polycyclic condensed aromatic hydrocarbons, which have the characteristics of high aromaticity, high carbon content, and easy polymerization or crosslinking. [0003] There are many existing technologies on how to deal with the residue of direct coal liquefaction. [0004] CN102399564A discloses a system and method for processing coal direct liquefaction residue, and specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00
CPCC10G1/00
Inventor 郜丽娟李初福巴黎明李国涛张朝环张峰孙永伟
Owner CHNA ENERGY INVESTMENT CORP LTD