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Method for producing methane from synthesis gas

A technology for synthesis gas and methane, which is applied in chemical instruments and methods, gas fuels, petroleum industry, etc., and can solve the problems such as patent disclosure or research reports of moving bed methanation reactors that have not yet been seen.

Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Up to now, there is no patent disclosure or research report on moving bed methanation reactor

Method used

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  • Method for producing methane from synthesis gas
  • Method for producing methane from synthesis gas
  • Method for producing methane from synthesis gas

Examples

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Embodiment 1

[0049]Lignite fragments with a particle size of 5-50mm (see Table 1 for chemical composition) are gasified into crude synthesis gas with oxygen / water vapor as gasification agent, and the obtained crude synthesis gas is sequentially cooled, detarred, water-gas shifted, After crude desulfurization, the net syngas (composition see Table 2) is obtained, in which (CO+H 2 ) content is 76.32% by volume, H 2 / CO molar ratio is 3.02, H 2 The S content was 4.8 ppm.

[0050] Table 1

[0051] project

lignite

Elemental analysis (weight%)

C

74.97

H

5.14

O

17.03

N

1.14

S

1.07

other trace elements

0.65

[0052] Table 2

[0053] main component

(mol%)

H 2

57.33

CO

18.98

CO 2

2.20

CH 4

19.23

N 2

1.09

Ar

0.54

C2+ hydrocarbons

0.63

h 2 S

4.8ppm

[0054] The first methanation reactor is a moving bed reactor, ...

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Abstract

The invention provides a method for producing methane from synthesis gas. The method comprises steps as follows: purified synthesis gas and a first methanation catalyst are subjected to contact reaction in a first methanation reactor and are continuously subjected to the contact reaction with a fresh / used first methanation catalyst and / or a regenerated first methanation catalyst in a second methanation reactor, high-temperature gas material flow is subjected to heat exchange cooling, and gas material flow I rich in methane is obtained; the gas material flow I and a second methanation catalystare subjected to the contact reaction in a third methanation reactor, gas material flow is cooled, and a gas product II rich in methane is obtained. According to the method, methane can be produced from the synthesis gas, furthermore, the moving-bed methanation catalysts can be regenerated and recycled online, so that strict requirements for feed gas pretreatment process are effectively reduced, meanwhile, the methanation catalysts undertake the function of a heat carrier in a moving bed, and reaction heat can be effectively utilized.

Description

technical field [0001] The invention relates to a synthesis gas conversion process, more specifically, a method for converting carbonaceous materials into synthesis gas, and converting the synthesis gas into methane-rich gas by using a combined methanation process. Background technique [0002] With the rapid growth of China's economy, traditional natural gas and oil resources are far from meeting the needs of social production and people's lives. It is estimated that by 2020, China's natural gas gap will exceed 100 billion cubic meters (standard) per year. Considering China's energy endowment and energy security, it is necessary to convert coal and biomass into civil gas, transportation fuel, and basic chemical raw materials. Among them, the coal-to-natural gas technology is the process of using low-rank lignite to produce syngas through gasification, and then convert it into methane, which is used as gas fuel. The coal-to-natural gas process has high energy efficiency, l...

Claims

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Application Information

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IPC IPC(8): B01J8/00C10L3/08
Inventor 任文坡张博郑丽君王春娇翟绪丽曲静波黄格省魏寿祥李振宇李雪静杨延翔
Owner PETROCHINA CO LTD
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