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Method of producing rough synthesis gas by taking direct coal liquefaction residue as raw material

A technology for direct coal liquefaction and crude synthesis gas, applied in the direction of granular/powder fuel gasification, etc., can solve problems such as pollution of the environment, and achieve the effect of simple treatment process and high added value

Active Publication Date: 2014-07-16
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main treatment method for the direct coal liquefaction residue is direct combustion, but due to the high sulfur content in the direct coal liquefaction residue, a large amount of sulfur dioxide will be generated during the combustion process, which seriously pollutes the environment

Method used

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  • Method of producing rough synthesis gas by taking direct coal liquefaction residue as raw material
  • Method of producing rough synthesis gas by taking direct coal liquefaction residue as raw material
  • Method of producing rough synthesis gas by taking direct coal liquefaction residue as raw material

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Embodiment approach

[0027] According to a typical embodiment of the present invention, the step of preparing crude synthesis gas by gasifying coal water slurry with oxygen includes: mixing coal water slurry with oxygen, and then placing the coal water slurry at 1200°C-1400°C and 4.0MPa-8.7MPa The gasification reaction is performed to obtain crude synthesis gas; and the crude synthesis gas is purified and shifted to obtain crude synthesis gas. The specific reaction temperature and pressure are determined by the melting characteristics of gasification raw ash and the pressure requirements of downstream devices.

[0028] The invention also provides a device for producing crude synthesis gas by using the coal direct liquefaction residue as a raw material. Such as figure 1 As shown, the device includes: a coal mill 10, a coal slurry storage tank 20 and a gasifier 40, the coal pulverizer 10 is provided with a feed port and a discharge port, the feed port of the coal slurry storage tank 20 is connected...

Embodiment 1

[0034] 1) Preprocessing steps

[0035] The high-temperature liquid coal direct liquefaction residue flowing out of the coal liquefaction reactor is sent to the residue forming machine to be indirectly cooled until the residue is brittle

[0036] Point below, and then molded into 2 ~ 8mm flake solid.

[0037] 2) Preparation of coal water slurry step

[0038]The flaky coal pretreated in step 1) is directly liquefied residue, ground in a coal mill until 99% of the particle size is less than 1mm, and added water during the grinding process, and added modified lignin additive, to obtain a residue slurry with a mass percentage concentration of 70%; put the raw coal in another coal mill to grind to 99% of the particle size is less than 1mm, and add water to pulp during the grinding process. The modified lignin additive is added to obtain a raw coal slurry with a mass percentage concentration of 60%.

[0039] Send the residue slurry and raw coal slurry (mixed according to the dry b...

Embodiment 2

[0041] The operation steps and raw materials are the same as those in Example 1, except that the residue slurry and raw coal slurry (mixed at a ratio of 70:30 on a dry basis) are sent into a coal slurry storage tank for stirring and mixing to obtain a coal-water slurry with a concentration of 64wt%. .

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Abstract

The invention discloses a method of producing rough synthesis gas by taking direct coal liquefaction residue as a raw material. The method comprises the following steps of: S1, preparing the direct coal liquefaction residue into coal-water slurry; S2, mixing the coal-water slurry with an oxygen gas to carry out gasification reaction to obtain rough synthesis gas. The method disclosed by the invention realizes sufficient and efficient utilization of the direct coal liquefaction residue, so that sulfur with higher content in the direct coal liquefaction residue is converted into H2S in a gasification process and recycled in a follow-up rough synthesis gas purifying process, and therefore, an efficient utilization process is pollution-free on environment, high in product additional value, simple in treatment process, and free of bad influences on equipment operation; meanwhile, a heat value of the direct coal liquefaction residue is high and Fe-series catalysts needed for liquidation of coals enriched in the direct coal liquefaction residue have catalytic effect on the coal gasification process, so that content of active gas ingredients in the finally obtained rough synthesis gas is higher.

Description

technical field [0001] The invention relates to the technical field of coal liquefaction residue treatment, in particular to a method for producing crude synthesis gas by using coal direct liquefaction residue as a raw material. Background technique [0002] Coal direct liquefaction is a process in which coal is directly catalytically hydrocracked under appropriate temperature and pressure conditions to degrade and hydrogenate it into liquid oil. In the process of direct liquefaction, unconverted organic matter, inorganic minerals and external liquefaction catalyst constitute the main body of coal liquefaction residue. Liquefaction residue is a by-product of the direct coal liquefaction process. It is a high-carbon, high-ash and high-sulfur substance. Its yield is usually about 30% of the total amount of liquefied raw coal, and its calorific value is 7000 kcal / About a kilogram. [0003] At present, the world's first coal direct liquefaction production line has been succes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/46
Inventor 任海君李水弟蔡丽娟王立志
Owner CHNA ENERGY INVESTMENT CORP LTD
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