Method for graded conversion of low-rank coal and system for graded conversion of low-rank coal

A technology for low-rank coal and coarse pulverized coal, which is applied in the field of low-rank coal classification and conversion, can solve the problems of difficult operation, complicated slag solidification unit process, etc., to simplify the preparation process, improve the pyrolysis efficiency and improve the utilization efficiency. Effect

Active Publication Date: 2020-02-21
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

In this invention, although the treatment of low-rank coal makes the carbon conversion rate of ...

Method used

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  • Method for graded conversion of low-rank coal and system for graded conversion of low-rank coal
  • Method for graded conversion of low-rank coal and system for graded conversion of low-rank coal
  • Method for graded conversion of low-rank coal and system for graded conversion of low-rank coal

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Experimental program
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Effect test

Embodiment 1

[0143] S1: Send the coarse coal powder to the pyrolysis furnace, mix it with the hot semi-coke from the primary gasifier, and undergo a pyrolysis reaction at 500°C and 0.1MPa to obtain pyrolysis coke and pyrolysis oil gas. Separation of oil and gas separation equipment to obtain gas, coal tar and phenolic wastewater;

[0144] S2: The pyrolysis coke is input into the primary gasifier, and the first gasification reaction occurs with water vapor and oxygen (volume ratio: 10:1) to obtain the first crude synthesis gas entrained with fine coke powder and the temperature is 850 ℃, the hot semi-coke is sent to the pyrolysis furnace to provide a heat source for the pyrolysis of coarse coal powder;

[0145] Among them, the temperature of the first gasification reaction is 860°C, and the reaction pressure is 0.1MPa;

[0146] S3: The first crude syngas is separated by a primary cyclone separator to obtain the first fine coke powder and the second crude syngas with an average particle size ...

Embodiment 2

[0160] S1: Send the coarse coal powder to the pyrolysis furnace, mix it with the hot semi-coke from the primary gasifier, and undergo a pyrolysis reaction at 600°C and 1.2MPa to obtain pyrolysis coke and pyrolysis oil gas. Oil and gas are separated by oil and gas separation equipment to obtain coal gas, coal tar and phenolic wastewater;

[0161] S2: The pyrolysis coke is input into the first-stage gasification furnace through the slide valve, and the first gasification reaction occurs with water vapor and oxygen (volume ratio: 15:1), to obtain the first crude synthesis gas entrained with fine coke powder and The hot semi-coke with a temperature of 880°C is sent to the pyrolysis furnace to provide a heat source for the pyrolysis of coarse coal powder;

[0162] Wherein, the temperature of the first gasification reaction is 900°C, and the reaction pressure is 1.0MPa;

[0163] S3: The first crude syngas is separated by a primary cyclone separator to obtain the first fine coke pow...

Embodiment 3

[0177] S1: Send the coarse coal powder to the pyrolysis furnace, mix it with the hot semi-coke from the primary gasifier, and undergo a pyrolysis reaction at 550°C and 1.0MPa to obtain pyrolysis coke and pyrolysis oil gas. Separation of oil and gas separation equipment to obtain gas, coal tar and phenolic wastewater;

[0178] S2: The pyrolysis coke is input into the first-stage gasification furnace, and the first gasification reaction occurs with water vapor and oxygen (volume ratio: 10:1), to obtain the first crude synthesis gas entrained with fine coke powder and the temperature is 790 ℃, the hot semi-coke is sent to the pyrolysis furnace to provide a heat source for the pyrolysis of coarse coal powder;

[0179] Wherein, the temperature of the first gasification reaction is 800°C, and the reaction pressure is 0.5MPa;

[0180] S3: The first crude syngas is separated by a primary cyclone separator to obtain the first fine coke powder and the second crude syngas with an averag...

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Abstract

The invention relates to the technical field of graded conversion of low-rank coal, and discloses a method for graded conversion of low-rank coal and a system for graded conversion of low-rank coal. The method comprises the following steps: (1) pretreating low-rank coal to obtain fine coal powder and coarse coal powder; (2) pyrolyzing the coarse coal powder to obtain coal tar, phenol-containing wastewater and the like; (3) carrying out a first gasification reaction on pyrolysis coke to obtain first coarse synthetic gas and hot semicoke; (4) separating the first coarse synthetic gas to obtain first fine coke powder and second coarse synthetic gas; (5) preparing a hydrogenation catalyst from the second coarse synthetic gas and an active metal element salt; (6) carrying out a hydrocracking reaction on the coal tar; and (7) preparing coke coal slurry from the fine coal powder, the phenol-containing wastewater and the like, and carrying out a second gasification reaction. According to the invention, deep coupling of the coal pyrolysis gasification technology and the clean fuel preparation technology is realized, and the difficult problems of graded high-efficiency utilization and cleanconversion of low-rank coal resources are solved. The method has the characteristics of high coal conversion rate, good integration, low catalyst cost, no discharge of dangerous solid waste and the like.

Description

technical field [0001] The invention relates to the technical field of graded conversion of low-rank coal, in particular to a method for graded conversion of low-rank coal and a system for graded conversion of low-rank coal. Background technique [0002] my country is a country rich in coal resources. For a long period of time in the future, coal will still occupy a dominant position in my country's energy structure. Among them, the reserves of low-rank coal represented by lignite and low-modified bituminous coal account for about The efficient utilization of low-rank coal is becoming more and more important. However, low-rank coal has a low degree of coalification, high water content, low efficiency during direct combustion or gasification, and large emissions of pollutants and carbon, which cannot fully utilize its resource value, resulting in a great waste of coal resources. Therefore, the graded utilization of coal resources, especially low-rank coal resources, is consid...

Claims

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Application Information

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IPC IPC(8): C10J3/66C10J3/84C10J3/48C10J3/46C10G67/00C10B53/04
CPCC10B53/04C10G67/00C10J3/46C10J3/48C10J3/66C10J3/84C10J2300/093C10J2300/0959C10J2300/0976C10J2300/1603Y02P20/52
Inventor 王卫平吴治国王蕴王鹏飞崔龙鹏邹亮
Owner CHINA PETROLEUM & CHEM CORP
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