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Method for producing natural gas by subcritical hydrolysis of polyhydrocarbon compound

A technology of polyhydrocarbons and subcritical water, applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of reducing the cost of coal-to-natural gas, achieve stable yield, prevent the reverse reaction of methane gas, and simple reaction process

Inactive Publication Date: 2019-07-12
中国煤层气集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for producing natural gas by subcritical hydrolysis of polyhydrocarbons. The method prepares methane gas by reacting subcritical water with dry coal powder or coal-water slurry; the reaction does not need to add Catalyst, which overcomes the defect of using a large number of "catalysts that cause severe environmental pollution" as the core technology of coal-to-natural gas in the prior art; greatly reduces the cost of coal-to-natural gas

Method used

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  • Method for producing natural gas by subcritical hydrolysis of polyhydrocarbon compound
  • Method for producing natural gas by subcritical hydrolysis of polyhydrocarbon compound
  • Method for producing natural gas by subcritical hydrolysis of polyhydrocarbon compound

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preparation example Construction

[0038] The preparation method of the coal-water slurry of the present invention is a conventional method in the field, for example, mixing dry coal powder, water and surfactant uniformly to obtain the coal-water slurry. The average particle size of dry coal powder for preparing coal-water slurry is preferably 30-300 mesh.

[0039] In the present invention, the surfactant used is a surfactant that helps water and dry coal powder to wet to form a slurry, and the surfactant can be any surfactant in the art that prepares coal-water slurry with the aforementioned wettability ; Such as lignin sulfonate, alkenyl sulfonate, etc.

[0040] According to the present invention, preferably, the dry coal powder is atomized dry coal powder, and the coal-water slurry is atomized coal-water slurry;

[0041] In the present invention, the atomized dry coal powder and the atomized coal-water slurry all use gas as the transport carrier to realize atomization; the gas used is preferably methane, CO...

Embodiment 1

[0080] Such as figure 1 As shown, the present embodiment provides a method for producing natural gas by subcritical hydrolysis of polyhydrocarbons, the method comprising:

[0081] (1) In a closed reactor, subcritical water and atomized coal-water slurry are subjected to heat exchange gasification, and then methanation reaction occurs to obtain methane gas; the subcritical water and the atomized coal-water slurry are Countercurrent contact; control the reaction temperature in the closed reactor to 600°C, and the reaction pressure to 3Mpa; carry out gas, solid and liquid separation treatment on the waste generated in the closed reactor;

[0082] (2) The mixed gas containing methane obtained in the closed reactor enters the back-stage reactor, and further methanation reaction occurs in the back-stage reactor to obtain methane gas; The reaction temperature is 600°C, and the reaction pressure is 3Mpa;

[0083] (3) cooling and removing impurities and separating the mixed gas conta...

Embodiment 2

[0088] Such as figure 1 As shown, the present embodiment provides a method for producing natural gas by subcritical hydrolysis of polyhydrocarbons, the method comprising:

[0089] (1) In a closed reactor, subcritical water and atomized coal-water slurry are subjected to heat exchange gasification, and then methanation reaction occurs to obtain methane gas; the subcritical water and the atomized coal-water slurry are Countercurrent contact; control the reaction temperature in the closed reactor to 750°C, and the reaction pressure to 9Mpa; carry out gas, solid and liquid separation treatment on the waste generated in the closed reactor;

[0090] (2) The mixed gas containing methane obtained in the closed reactor enters the back-stage reactor, and further methanation reaction occurs in the back-stage reactor to obtain methane gas; The reaction temperature is 750°C, and the reaction pressure is 9Mpa;

[0091] (3) cooling and removing impurities and separating the mixed gas conta...

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Abstract

The invention discloses a method for producing a natural gas by subcritical hydrolysis of a polyhydrocarbon compound. The method comprises the steps of conducting heat exchange gasification of subcritical water with dry coal powder or coal water slurry in a closed reactor, and conducting a methanation reaction to produce a methane gas. The method uses the subcritical water as a reactant and a heatsource agent to carry out the heat exchange gasification with the dry coal powder or the coal water slurry through the subcritical water without adding a catalyst, avoids environmental pollution caused by adding the catalyst, and reduces the cost of a coal-based natural gas.

Description

technical field [0001] The invention belongs to the technical field of coal-to-natural gas, and more specifically relates to a method for producing natural gas by subcritical hydrolysis of polyhydrocarbons. Background technique [0002] Synthetic natural gas is a technology that uses corresponding equipment to convert carbon-containing resources into methane based on the principle of methanation reaction. my country's energy resources are characterized by less oil, poor gas and rich coal. Efficient and clean utilization of cheap coal resources is an important way to solve the contradiction between supply and demand of natural gas in my country. [0003] As early as the 1970s, coal-to-natural gas technology has become a frontier topic in the global scientific research field. Since the beginning of this century, my country has invested heavily in coal methanation (coal-to-natural gas) projects in Inner Mongolia, Xinjiang, Shaanxi, Shanxi and other places. Although the above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10L3/10
CPCC10L3/08C10L3/101C10L3/103
Inventor 王忠胜
Owner 中国煤层气集团有限公司