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Method for preparing coke by using coal direct liquefaction residue

A technology of direct coal liquefaction and coal liquefaction, which is applied to the processing of tar pitch/petroleum pitch/natural pitch by chemical methods, the processing of tar pitch/petroleum pitch/natural pitch, and the processing of tar pitch/petroleum pitch/natural pitch by selective extraction, etc. Direction, can solve the problems of high price, complicated process, high cost, etc., and achieve the effect of strong development practicability, simple process and reasonable utilization

Active Publication Date: 2015-11-04
CHNA ENERGY INVESTMENT CORP LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the heavy liquefied oil and bituminous substances obtained in the method disclosed above can be used as binders for tamping and coking to prepare coke, they have the disadvantages of low β-resin content and poor cohesiveness, which are very important for improving coke strength. no significant effect
For example, in patents CN101962560A and CN101962561A, two-stage extraction and two-stage solid-liquid separation processes are used, which makes the process more complicated, and the source of the raw material extraction solvent is single and the price is high, the product yield is low, and the cost is high. The asphalt obtained The β-resin content of the similar substances is low, and the cohesiveness is poor. When the coke is prepared as a tamping coking binder, the mechanical strength of the coke has not been significantly improved. Therefore, the development applicability of this product is not strong. Not suitable as a binder for tamping and coking

Method used

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  • Method for preparing coke by using coal direct liquefaction residue

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Embodiment approach

[0027] According to a typical embodiment of the present invention, the step of preparing coal liquefaction modified asphalt includes: S11, mixing the coal direct liquefaction residue with an extraction solvent, stirring, and hot-melt extraction to obtain a hot-melt extraction mixture; S12, hot-melt extraction The mixture is subjected to solid-liquid separation to obtain an extract and a raffinate; S13, performing solvent recovery on the extract to obtain an extract; and S14, performing polymerization modification on the extract to obtain a coal liquefaction modified pitch.

[0028] In order to optimize the process of preparing the hot-melt extraction mixture, preferably, step S11 includes: mixing the residue of direct coal liquefaction with the extraction solvent at a mass ratio of 1:1 to 10 to obtain a mixed solution; and S12, feeding the mixed solution N 2 , and at 0.15-0.3MPa, the temperature of the mixed solution is raised to 150-200°C at 10°C-30°C / h, stirred at constant t...

Embodiment 1

[0037] 1) Add 300kg of coal direct liquefaction residue and 750kg of naphthalene oil (distillation range 160-260°C) into the stirring tank, stir at a speed of 60r / min to obtain a mixed liquid, and fill the stirring tank with N 2 After the pressure in the stirred tank reached 0.2MPa, the temperature of the mixture was raised to 150°C at a rate of 10°C per hour, then stirred at a constant temperature of 300r / min, and subjected to hot-solution extraction for 30min to obtain a hot-solution extraction mixture.

[0038] 2) Solid-liquid separation of the hot-solvent extraction mixture is carried out by means of hot-press filtration. The filtration temperature is 250° C., the filtration pressure is 2.0 MPa, and the pore size of the filter core is 50 μm. After primary filtration, 867kg of extract and 180kg of raffinate were collected.

[0039] 3) Send the extract to a vacuum distillation tower for solvent recovery, recover the extraction solvent at 120-210°C from the top of the tower ...

Embodiment 2

[0044] 1) Add 300kg coal direct liquefaction residue and 3000kg coal liquefaction medium oil (distillation range 150-310°C) into the stirring tank, stir at a speed of 75r / min, and fill the stirring tank with N 2 After the pressure in the stirred tank was reduced to 0.3MPa, the temperature was raised to 170°C at a rate of 30°C per hour, stirred at a constant temperature, and hot-melt extracted for 45 minutes at a rate of 50r / min to obtain a hot-melt extraction mixture.

[0045] 2) Solid-liquid separation of the hot-solvent extraction mixture is carried out by means of hot-press filtration. The filtration temperature is 120° C., the filtration pressure is 0.4 MPa, and the pore size of the filter core is 40 μm. After filtration, the extract and raffinate were collected.

[0046] 3) Send the extract to a vacuum distillation tower for solvent recovery, recover the extraction solvent at 120-210°C from the top of the tower for recycling, collect the extract with an ash content of 1....

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Abstract

The invention discloses a method for preparing coke by using direct coal-liquefied residue. The method comprises the following steps: S1, orderly carrying out primary hot melt-extraction, primary solid-liquid separation and polymeric modification on the direct coal-liquefied residue, so as to obtain coal-liquefied modified asphalt; S2, mixing the coal-liquefied modified asphalt with cleaned coal for coking, crushing, tamping and pressing into a cake, so as to obtain a coal briquette; and S3, conveying the coal cake to a coke burner to heat and insulate heat in isolated air, and then cooling and screening to obtain the coke. The coal-liquefied modified asphalt which is obtained from the direct coal-liquefied residue in manners of hot melt-extraction, solid-liquid separation and polymeric modification is applied to a tamping coking process, so that the coke of which all indexes achieve the first national metallurgical coke standard is obtained; the yield of qualified products can be up to over 82%.

Description

technical field [0001] The invention relates to the technical field of deep processing of coal liquefaction residues, in particular to a method for preparing coke from coal liquefaction residues. Background technique [0002] With the rapid development of the national economy, the process of modernization and social development continues to accelerate, my country's consumption of petroleum products continues to grow, greatly exceeding the growth rate of crude oil production during the same period, resulting in an increase in our petroleum imports year by year, and has exceeded the natural Yield. However, my country is a country rich in coal and poor in oil. Making full use of abundant coal resources and developing advanced clean coal technologies such as direct coal liquefaction is one of the important ways to reduce the excessive dependence on foreign crude oil and alleviate the shortage of my country's oil resources and the tight supply and demand of petroleum products. Fir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B57/06C10B53/08C10C3/00C10C3/02C10C3/08
Inventor 李克健武振林吴秀章章序文郭亮东李月馨刘云廷程时富
Owner CHNA ENERGY INVESTMENT CORP LTD