Method for preparing methane-rich gas from synthesis gas

A technology of methane gas and synthesis gas, which is applied in the direction of gas fuel, chemical instruments and methods, petroleum industry, etc., can solve the problems that have not been seen in the patent disclosure or research report of the moving bed methanation reactor, and achieve easy control and lower requirements Effect

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 preparing methane-rich gas from synthesis gas
  • Method for preparing methane-rich gas from synthesis gas
  • Method for preparing methane-rich gas from synthesis gas

Examples

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Embodiment 1

[0043] 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 74.59% by volume, H 2 / CO molar ratio is 3.07, H 2 The S content is 5 ppm.

[0044] Table 1

[0045]

[0046]

[0047] Table 2

[0048] main component

(mol%)

H 2

56.26

CO

18.33

CO 2

2.20

CH 4

20.87

N 2

1.14

Ar

0.57

C2+ hydrocarbons

0.63

h 2 S

5ppm

[0049] The first methanation reactor is a moving bed reactor, and the catalyst is a small spherical methanation catalyst with an average diameter of 2.6 mm (composition: 20.3% by weight NiO, 78.9% by weight Al 2 o 3 , 0.6 wt% Fe 2 o 3 , 0.2...

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Abstract

The invention provides a method for preparing methane-rich gas 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 methanated feed gas is obtained; the methanated feed gas and a second methanation catalyst are subjected to the contact reaction in a second methanationreactor, and gas material flow I is obtained; the first methanation catalyst is led out from the first methanation reactor and divided into three parts; the gas material flow I is subjected to the contact reaction with a third-part catalyst and/or a regenerated first methanation catalyst in a third methanation reactor, and a methane-rich gas product is obtained. The methanation catalysts undertake the function of a heat carrier in a moving bed and can be regenerated and recycled online, and reaction heat is effectively recycled.

Description

technical field [0001] The invention relates to a method for preparing methane-rich gas from synthesis gas, more specifically, a method for converting carbonaceous materials into synthesis gas, and the synthesis gas is prepared through a methanation combined process to prepare methane-rich gas. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08B01J8/00
CPCB01J8/00C10L3/08
Inventor 任文坡宋倩倩翟绪丽丁文娟师晓玉乔明王红秋周笑洋李振宇李雪静杨延翔
Owner PETROCHINA CO LTD
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