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Coal liquefaction method and system

A technology of liquefaction treatment and coal slurry, which is applied in the field of coal liquefaction method and its system, can solve the problems of high cost of liquefaction, low yield of light oil, high hydrogen consumption, etc., and achieve low gas yield and water yield, high conversion efficiency and low hydrogen consumption

Active Publication Date: 2020-03-06
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the existing coal liquefaction technology to directly liquefy low-metamorphic coal has the disadvantage of high hydrogen consumption, and such coal is easy to gasify, and the yield of light oil is low, resulting in high cost and low benefit of liquefaction

Method used

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  • Coal liquefaction method and system
  • Coal liquefaction method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] This embodiment is used to illustrate the coal liquefaction method and system of the present invention.

[0100] use figure 1 In the system shown, the above-mentioned coal powder and the hydrogen-donating solvent are mixed in the coal slurry preparation device 1 according to the mass ratio of 40:60, and the mixed coal slurry is pumped to the pyrolyzer 2 for pyrolysis, and the heat is collected The decomposed gaseous material is separated and analyzed, and the pyrolysis residue is sent to the mixing device 3 to mix with the main catalyst and the co-catalyst entering by the catalyst feeding port (wherein, relative to the consumption of dry coal powder, the consumption of the main catalyst is 3 wt. %, the amount of co-catalyst is 2.4% by weight); the material obtained by mixing is merged with hot hydrogen (the temperature of the hot hydrogen is 200° C.) and sent to the liquefied material preheater for preheating; then the preheated The material is sent to the first liquef...

Embodiment 2

[0107] This embodiment is used to illustrate the coal liquefaction method and system of the present invention.

[0108] Carry out the liquefaction of coal according to the method described in embodiment 1, difference is, wherein:

[0109] The pyrolysis conditions include: temperature is 400°C, residence time is 45min, gauge pressure is 0.8MPa;

[0110] The conditions of the first liquefaction treatment include: the temperature is 445°C, the residence time is 90min, and the gauge pressure is 19MPa;

[0111] The conditions of the second liquefaction treatment include: the temperature is 450°C, the residence time is 90min, and the gauge pressure is 19MPa;

[0112] The conditions for high-temperature gas-liquid separation include: the temperature is 430°C, the residence time is 20min, and the gauge pressure is 19MPa;

[0113] The analysis results are shown in Table 1.

Embodiment 3

[0115] This embodiment is used to illustrate the coal liquefaction method and system of the present invention.

[0116] Carry out the liquefaction of coal according to the method described in embodiment 1, difference is, wherein:

[0117] The pyrolysis conditions include: temperature 350°C, residence time 37min, gauge pressure 0.65MPa;

[0118] The conditions of the first liquefaction treatment include: the temperature is 437°C, the residence time is 50min, and the gauge pressure is 18MPa;

[0119] The conditions of the second liquefaction treatment include: the temperature is 455°C, the residence time is 50min, and the gauge pressure is 18MPa;

[0120] The conditions for high-temperature gas-liquid separation include: the temperature is 415°C, the residence time is 13min, and the gauge pressure is 18MPa;

[0121] The analysis results are shown in Table 1.

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Abstract

The invention relates to the field of coal chemical processing, specifically to a coal liquefaction method and a system thereof. The coal liquefaction method comprises the following steps: mixing coalwith a hydrogen donor solvent so as to prepare a coal slurry; subjecting the coal slurry to pyrolysis so as to obtain a pyrolysis gaseous product and pyrolysis residues; mixing the pyrolysis residueswith a liquefaction catalyst, and transferring an obtained mixture and hot hydrogen to preheating treatment so as to obtain a hot liquefaction raw material; successively subjecting the hot liquefaction raw material to first liquefaction treatment and second liquefaction treatment; subjecting a product obtained by second liquefaction treatment to high-temperature gas-liquid separation so as to obtain a heavy oil component and a light component; and optionally, circularly transferring a part of the heavy oil component to first liquefaction treatment. The coal liquefaction method provided by theinvention can realize direct liquefaction treatment of coal, and achieves high coal conversion rate, low hydrogen consumption, low gas yield and water yield and high oil yield.

Description

technical field [0001] The invention relates to the field of coal chemical processing, in particular to a coal liquefaction method and a system thereof. Background technique [0002] Coal direct liquefaction is an advanced clean coal technology that converts solid coal into clean liquid fuel. The development of coal liquefaction technology can not only alleviate the tight supply and demand of petroleum products, but also improve the utilization rate of my country's coal resources and reduce coal-burning pollution. At present, the development direction of coal liquefaction is to reduce hydrogen consumption, reduce gas yield, increase oil yield, reduce harsh reaction conditions, and improve economic benefits. The coal resources that can be directly liquefied in my country include bituminous coal, sub-bituminous coal and lignite, etc. These coals have high oxygen content, especially sub-bituminous coal and lignite. During the liquefaction reaction, oxygen and hydrogen are easi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00C10G1/08
CPCC10G1/00C10G1/065C10G1/083C10G2300/10C10G2300/70C10G2400/06
Inventor 艾军金环年马辉门卓武李景
Owner CHNA ENERGY INVESTMENT CORP LTD
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