Method for preparing coke by using direct coal-liquefied residue

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

Active Publication Date: 2013-12-11
CHNA ENERGY INVESTMENT CORP LTD +3
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  • 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 direct coal-liquefied residue

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Embodiment approach

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

[0028] In order to optimize the process of preparing the hot melt extraction mixture, preferably, step S11 includes: mixing the coal direct liquefaction residue with the extraction solvent in a mass ratio of 1:1-10 to obtain a mixed liquid; and S12, passing into the mixed liquid N 2 , And at 0.15~0.3MPa at 10℃~30℃ / h, the mixture is heated to 150℃~200℃, stirred at constant temperature, hot melt extraction,...

Embodiment 1

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

[0038] 2) The hot-melt extraction mixture is subjected to solid-liquid separation by hot-pressure filtration. The filtration temperature is 250°C, the filtration pressure is 2.0 MPa, and the pore size of the filter element is 50 μm. After primary filtration, 867 kg of extract and 180 kg of raffinate were collected.

[0039] 3) The extract is sent to the vacuum distillation tower for solvent recovery. The extraction solvent at 120-210°C is recovered at the top of the tower for recycling. The extra...

Embodiment 2

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

[0045] 2) The hot-melt extraction mixture is subjected to solid-liquid separation by hot-pressure filtration. The filtration temperature is 120°C, the filtration pressure is 0.4MPa, and the pore size of the filter element of the filter is 40μm. After filtration, the extract and raffinate were collected.

[0046] 3) The extract is sent to the vacuum distillation tower for solvent recovery, and the extraction solvent at 120-210°C is recycled at the top of the to...

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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, and in particular to a method for preparing coke by using coal liquefaction residues. Background technique [0002] With the rapid development of the national economy, the process of modernization and social development has been accelerating, my country’s consumption of petroleum products has continued to increase, which has greatly exceeded the growth rate of crude oil production during the same period, resulting in an increase in our oil imports year by year, and has exceeded the self Yield. 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 excessive dependence on foreign crude oil, and alleviate the shortage of petroleum resources and the tight supply and demand of petroleum products in my country....

Claims

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Application Information

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Patent Type & Authority Applications(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
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