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A cooling system and method for coal direct liquefaction residue

A technology for direct liquefaction and cooling of coal, applied in the field of coal processing, can solve the problems of reducing energy consumption by cooling and forming residues, and achieve the effects of avoiding water pollution problems, reducing usage, and avoiding the generation of industrial waste water.

Active Publication Date: 2020-08-04
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] More specifically, the purpose of the present invention is to overcome the defect that the methods of the prior art cannot solve the problem of how to reduce energy consumption in the process of cooling and forming the residue discharged from the bottom of the vacuum tower, and provide a residue cooling process that can recover a large amount of high temperature Cooling system and method for reducing the heat released in the process and significantly reducing the consumption of cooling water and avoiding the residue of coal direct liquefaction that pollutes waste water

Method used

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  • A cooling system and method for coal direct liquefaction residue
  • A cooling system and method for coal direct liquefaction residue

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Effect test

Embodiment 1

[0086] Embodiment 1: the cooling method of coal direct liquefaction residue (three-stage cooling process)

[0087] This embodiment adopts figure 1 The system shown performs, specifically:

[0088] (1) The decompression residue at the bottom of the decompression tower from the direct liquefaction of coal with a flow rate of 320°C of 100t / h is first cooled to a temperature of 240°C through a spiral sleeve heat exchanger, and the first cooling is passed through Indirect contact between the decompression residue and saturated water with a flow rate of 2.95t / h at a temperature of 1.1MPa at 200°C (screw heat exchange method), during the contact process, the output of low-pressure steam at 1.1MPa is 2.95t / h;

[0089] (2) The decompression residue obtained through step (1) is subjected to a second cooling to a temperature of 130° C. through a mechanical piston jacket cooler, and the second cooling is achieved by combining the decompression residue obtained through step (1) with Lo...

Embodiment 2

[0092] Embodiment 2: the cooling method of coal direct liquefaction residue (three-stage cooling process)

[0093] This embodiment adopts figure 1 The system shown performs, specifically:

[0094] (1) The decompression residue at the bottom of the vacuum tower from the direct liquefaction of coal with a flow rate of 100t / h at 320°C is first cooled to a temperature of 235°C through a spiral sleeve heat exchanger, and the first cooling is passed through Indirect contact between the decompression residue and saturated water with a flow rate of 3.14t / h at a temperature of 1.1MPa at 200°C (screw heat exchange method), during the contact process, the output of low-pressure steam at 1.1MPa is 3.14t / h,

[0095] (2) The decompression residue obtained through step (1) is subjected to a second cooling to a temperature of 120° C. through a mechanical piston jacket cooler, and the second cooling is achieved by combining the decompression residue obtained through step (1) with Low-tempe...

Embodiment 3

[0098] Embodiment 3: the cooling method of coal direct liquefaction residue (three-stage cooling process)

[0099] This embodiment adopts figure 1 The system shown performs, specifically:

[0100] (1) The decompression residue at the bottom of the vacuum tower from the direct liquefaction of coal with a flow rate of 100 t / h at 320°C is first cooled to a temperature of 225°C through a spiral sleeve heat exchanger, and the first cooling is passed through The decompression residue is in direct contact with 1.1MPa saturated water with a temperature of 200°C and a flow rate of 3.5t / h (screw heat exchange method). During this contact process, the output of 1.1MPa low-pressure steam is 3.5t / h,

[0101] (2) The decompression residue obtained through step (1) is cooled to a temperature of 140°C for the second time through a mechanical piston jacket cooler, and the second cooling is achieved by combining the decompression residue obtained through step (1) with Low-temperature low-pr...

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Abstract

The invention relates to the coal processing field and discloses a cooling system and method for direct coal liquefaction residue. The system comprises a first cooling unit and a second cooling unit.The first cooling unit is used for performing first cooling operation on pressure-reducing residual slag from a pressure-reducing tower bottom using direct coal liquefaction. The first cooling operation is performed in such a manner of guiding pressure-reducing residual slag into a mechanical piston jacket-type cooler and indirectly contacting the pressure-reducing residual slag with cooling mediums a ling medium. The second cooling unit is used for performing second cooling operation on pressure-reducing residual slag subjected to first cooling operation. The second cooling operation is performed in such a manner of guiding pressure-reducing residual slag subjected to first cooling operation into a gas cooler and directly or indirectly contacting the pressure-reducing residual slag with the cooling mediums. With the above-mentioned cooling system and method for direct coal liquefaction residue, a large quantity of cooling water and other utilities are no longer consumed. Therefore, the effect of evidently saving energy and saving water is obtained. Additionally, the method helps avoid generation of industrial waste water.

Description

technical field [0001] The invention relates to the field of coal processing, in particular to a cooling system for direct coal liquefaction residue and a cooling method for direct coal liquefaction residue. Background technique [0002] In the direct coal liquefaction project, after the coal is hydrogenated in the direct liquefaction reactor, most of the liquid oil with a wide fraction distribution, a small amount of gas and water, etc. are produced, and the oil with other heavy fractions and all solid materials including raw oil coal slurry The catalyst, the ash in coal (inorganic minerals), unreacted coal, etc. are subjected to solid-liquid separation by vacuum distillation, including solvent components and oil with a heavy distillation range, which are distilled from the side line and top of the vacuum tower, and more Heavy heavy oil and bituminous substances (mainly asphaltene and pre-asphaltenes) and all solid substances are discharged from the bottom of the vacuum tow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D7/10F28F1/08
CPCF28D7/10F28F1/08
Inventor 李国涛巴黎明李初福郜丽娟张朝环张峰孙永伟
Owner CHNA ENERGY INVESTMENT CORP LTD