Process for preparing methane by utilizing coke oven gas

A coke oven gas and process technology, which is applied in the petroleum industry, gas fuel, fuel and other directions, can solve the problems of large consumption of coke oven gas, difficult catalyst recovery, and difficulty in generating gas from the reaction, and achieves high methane output, low load, easy separation effect

Inactive Publication Date: 2012-09-19
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0010] The invention aims to solve the problems of large consumption of coke oven gas and serious waste of hydrogen resources in the existing methanation technology, as well as the problems of difficult catalyst recovery and difficult treatment of reaction gas in the process of coal catalytic hydromethanation, and provides a coke Process of producing methane from furnace gas

Method used

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  • Process for preparing methane by utilizing coke oven gas
  • Process for preparing methane by utilizing coke oven gas
  • Process for preparing methane by utilizing coke oven gas

Examples

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Embodiment 1

[0019] Using the coke oven gas produced by the 1 million tons coking plant as the gas source, the coke oven gas is first purified to remove dust and tar, and then CO conversion and decarbonization are carried out. The composition and volume content of decarburized coke oven gas are: H 2 Content 70%, CH 4 Content 26%, C m H n (Other alkanes except methane) content 3.5%, CO content 0.2%, CO 2 Content 0.1%, total sulfur mass content 6g / Nm 3 . The decarburized coke oven gas is pressurized to 6MPa, and mixed with the circulating gas at a volume ratio of 1:1.5 to obtain a mixed raw material gas. The volume content of methane in the mixed raw gas is 10.4%. The mixed raw material gas first exchanges heat with the reaction product gas, then is heated to 550°C, and finally sent to the methanation reactor; the elemental analysis shows that the oxygen content of the methanation carbon material without water and ash is 5.8%. The mass content of hydrogen is 4.7% and the mass content of carbo...

Embodiment 2

[0021] Taking the coke oven gas produced by the 1 million tons coking plant as the gas source, the composition and volume content of the coke oven gas after purification, CO conversion and decarbonization are: H 2 Content 65%, CH 4 Content 28%, C m H n 3% content, 0.1% CO content, CO 2 Content 0.2%, total sulfur content 3g / Nm 3 gas. Then pressurize the decarburized gas to 7 MPa, and mix it with the circulating gas in a volume ratio of 1:2 to obtain a mixed raw material gas. The volume content of methane in the mixed raw gas is 9.3%. The mixed raw material gas is heated to 600°C first, and then sent from the bottom of the methanation reactor to the methanation reactor; the selected methanation carbon material has an anhydrous and ash-free oxygen element mass content of 6.5%, and hydrogen element The mass content is 4.9%, and the carbon content is 85.3% (obtained by elemental analysis). The methanation carbon material heated to 450°C is fed into the methanation reactor at a feed ...

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Abstract

The invention relates to a process for preparing methane by utilizing coke oven gas. The adopted materials are methanation carbon materials and the coke oven gas with low oxygen content and high hydrogen content. The principle is that H2 in mixed raw material gas reactes with 30-70 percent of C with high hydrogenation activity in the methanation carbon materials to generate methane through the chemical equation that C and 2H2 generate CH4. The process flow comprises the following steps of: converting CO in the coke oven gas into H2; decarburizing and pressurizing; mixing the H2 and recycle gas according to a certain proportion to obtain mixed raw material gas rich in H2; reacting the H2 in the mixed raw material gas with 30-70 percent of C with high hydrogenation activity in the methanation carbon materials to generate reactive gas through the chemical equation that C and 2H2 generate CH4 in a methanation reactor under a certain temperature and pressure; separating the reactive gas through heat transfer, purification and desulfuration to obtain recycle gas and product gas; returning the recycle gas into the mixed raw material gas; and outputting the product gas. The process has the characteristics of low hydrogen consumption, large methane output, and environmental protection.

Description

Technical field [0001] The invention relates to a process for preparing methane from coke oven gas, in particular to coke oven gas and a methanation carbon material with low oxygen content and high hydrogen content as reaction raw materials; 30 to 70% of the methanation carbon material is high Hydrogenation activity C and H in mixed feed gas 2 Pass C+2H 2 →CH 4 A process for producing methane from coke oven gas that reacts to produce methane. technical background [0002] The annual production of coke oven gas in China is as high as 150 billion m3. Except for part of the coke oven gas that is burned back to the coke oven, most of it is used as city gas. In addition, some coke oven gas is not well used, and the resource utilization rate is low. This has caused serious environmental pollution; China’s natural gas resources are scarce, and the supply gap has been increasing year by year; if coke oven gas is efficiently converted into substitute natural gas, it will not only increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 张永发丁晓阔张天开陈磊王影周羽
Owner TAIYUAN UNIV OF TECH
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