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A method and device for producing synthetic natural gas

A technology for synthesizing natural gas and product gas, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of lack of reactor design material-energy integration optimization, limitation of energy comprehensive utilization efficiency, narrow temperature range of catalyst, etc. The effect of cost reduction and popularization and application, improvement of comprehensive energy utilization efficiency, and avoidance of overheating sintering

Inactive Publication Date: 2018-06-26
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The direct production of methane by coal hydrogasification mainly has the following problems: low carbon conversion rate, low methane yield, complex gas composition, low methane concentration, and inability to obtain high-quality synthetic natural gas, etc.
Domestic methanation technology currently only stays at partial methanation, and the catalyst has a narrow temperature range, which greatly limits the comprehensive utilization efficiency of energy; in addition, partial methanation technology under normal pressure is not conducive to reaction and equipment strengthening, and lacks reactor design and matter-energy integrated optimization

Method used

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  • A method and device for producing synthetic natural gas
  • A method and device for producing synthetic natural gas
  • A method and device for producing synthetic natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This example is used to illustrate a preferred implementation of the method for producing synthetic natural gas provided by the present invention. Specifically, such as figure 1 with figure 2 As shown, the method includes the following steps:

[0063] a) Raw material gas 1 is heated to 180-200°C through the first heat exchange equipment 2 to obtain heated raw material gas 3, and the heated raw material gas 3 is divided into the first raw material gas 4 and the second raw material gas according to the volume ratio of 1:0.25 Share raw gas 5;

[0064] b) Mix the first feed gas 4 in step a) with the first recycle gas 25 to obtain the first mixed gas 6, and the first mixed gas 6 is heated to 260-280° C. through the second heat exchange device 8 to obtain The first mixed gas 9 after the temperature rise, the first mixed gas 9 after the temperature rise is passed into the catalyst bed layer on the top of the first methanation reactor 10 for reaction;

[0065] c) Mix the s...

Embodiment 2

[0077] This example is used to illustrate a preferred implementation of the method for producing synthetic natural gas provided by the present invention. Specifically, such as figure 1 with image 3 As shown, the method includes the following steps:

[0078] a) Raw material gas 1 is heated to 160-180°C through the first heat exchange equipment 2 to obtain heated raw material gas 3, and the heated raw material gas 3 is divided into the first raw material gas 4 and the second raw material gas according to the volume ratio of 1:0.33 Share raw gas 5;

[0079] b) Mix the first raw material gas 4 in step a) with the first recycle gas 25 to obtain the first mixed gas 6, and the first mixed gas 6 is heated to 270-290° C. through the second heat exchange device 8 to obtain The first mixed gas 9 after the temperature rise, the first mixed gas 9 after the temperature rise is passed into the catalyst bed layer on the top of the first methanation reactor 10 for reaction;

[0080] c) Mi...

Embodiment 3

[0092] This example is used to illustrate a preferred implementation of the method for producing synthetic natural gas provided by the present invention. Specifically, such as figure 1 with figure 2 As shown, the method includes the following steps:

[0093] a) Raw material gas 1 is heated to 150-170°C through the first heat exchange equipment 2 to obtain heated raw material gas 3, and the heated raw material gas 3 is divided into the first raw material gas 4 and the second raw material gas according to the volume ratio of 1:0.3 Share raw gas 5;

[0094] b) Mix the first raw material gas 4 in step a) with the first recycle gas 25 to obtain the first mixed gas 6, and the first mixed gas 6 is heated to 290-310° C. through the second heat exchange device 8 to obtain The heated first mixed gas 9 passes the heated first mixed gas 9 into the catalyst bed on the top of the first methanation reactor 10 for reaction;

[0095] c) Mix the second feed gas 5 in step a) with the second...

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Abstract

A method and a device for producing synthetic natural gas are provided. According to processes of the method, a raw material gas is preheated and separated into two parts, the first part of the raw material gas is fed into the upper part of a first methanation reactor after being mixed with a first heated recycle gas, the second part of the raw material gas is fed to the middle part of the first methanation reactor after being mixed with a second recycle gas so as to obtain a first product gas, the first product gas is cooled and separated into two parts, namely a first first-product gas and a second first-product gas, the first first-product gas is pressurized by a recycle compressor and then is separated into a first recycle gas and a second recycle gas, the second first-product gas is heated and fed into a second methanation reactor, and a second product gas is cooled and subjected to gas liquid separation to obtain a product gas. The method is reasonable in process and high in operationality and is advantaged by a high comprehensive energy utilization rate, capability of saving energy, environment protection, and the like.

Description

technical field [0001] The invention relates to a method and device for producing synthetic natural gas, in particular to a method and device for producing synthetic natural gas by using coal or biomass gasification products as raw materials, and belongs to the technical field of synthetic natural gas. Background technique [0002] Since the 1970s, along with the oil crisis, coal-to-methane (also known as Synthetic Natural Gas (SNG) or alternative natural gas) has developed rapidly. The main methods of coal-to-methane include: direct production of methane by coal hydrogasification and indirect production of methane through synthesis gas. [0003] The direct production of methane by coal hydrogasification mainly has the following problems: low carbon conversion rate, low methane yield, complex gas composition, low methane concentration, and inability to obtain high-quality synthetic natural gas. Relatively speaking, the indirect production of methane from coal through synthe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 李安学李春启左玉帮丁万友余铭程梅长松刘永健刘学武
Owner DATANG INT CHEM TECH RESINST
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