Method for synthesizing methane by using coke-oven gas

A technology for synthesizing methane and coke oven gas, applied in the direction of climate sustainability, sustainable manufacturing/processing, hydrocarbon production from carbon oxides, etc., to achieve the effects of low impurity content, high methane content, and environmental protection

Active Publication Date: 2009-03-25
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from the perspective of coke oven gas composition (more hydrogen and less carbon), synthesizing methanol is not the most economical way of utilization; and from the perspective of energy utilization, the energy utilization rate of coke oven gas to methanol is only 52%-55% about

Method used

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  • Method for synthesizing methane by using coke-oven gas

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Comparison scheme
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Embodiment 1

[0040] The method for utilizing coke oven gas to synthesize methane in this embodiment comprises the following main steps:

[0041] (1), Purification and removal of impurities: First, the coke oven gas is removed from impurities such as benzene, naphthalene, heavy hydrocarbon compounds, sulfides, etc. through the purification system, and then the coke oven gas composition (Vol%) is: H 2 58. CH 4 26.5,N 2 4. O 2 0.5, CO 7, CO 2 2. CmHn 2;

[0042] (2), compression heat exchange and adding water vapor: Compress the coke oven gas purified in the above step (1) to about 0.5Mpa at normal pressure, and exchange heat to about 350°C; then add water vapor, the amount of water vapor added CH in coke oven gas according to raw materials 4 Calculated so that H 2 O and CH 4 The molar ratio is 0.2:1;

[0043] (3), one-stage methanation reaction: after the purified coke oven gas is mixed with water vapor, it enters the first-stage methanation reaction furnace, and under the actio...

Embodiment 2

[0048] The method for utilizing coke oven gas to synthesize methane in this embodiment comprises the following main steps:

[0049] (1), Purification and removal of impurities: First, the coke oven gas is removed from impurities such as benzene, naphthalene, heavy hydrocarbon compounds, sulfides, etc. through the purification system, and then the coke oven gas composition (Vol%) is: H 2 58. CH 4 26.5,N 2 4. O 2 0.5, CO 7, CO 2 2. CmHn 2;

[0050] (2), compression heat exchange and adding water vapor: Compress the coke oven gas purified in the above step (1) to about 1.2Mpa at normal pressure, and exchange heat to about 330°C; then add water vapor, the amount of water vapor added CH in coke oven gas according to raw materials 4 Calculated so that H 2 O and CH 4 The molar ratio is 0.7:1;

[0051] (3), one-stage methanation reaction: after the purified coke oven gas is mixed with water vapor, it enters the first-stage methanation reaction furnace, and under the actio...

Embodiment 3

[0056] The method for utilizing coke oven gas to synthesize methane in this embodiment comprises the following main steps:

[0057] (1), Purification and removal of impurities: First, the coke oven gas is removed from impurities such as benzene, naphthalene, heavy hydrocarbon compounds, sulfides, etc. through the purification system, and then the coke oven gas composition (Vol%) is: H 2 58. CH 4 26.5,N 2 4. O 2 0.5, CO 7, CO 2 2. CmHn 2;

[0058] (2) Compression heat exchange and adding water vapor: compress the coke oven gas purified in the above step (1) to about 2Mpa, and exchange heat to about 400°C; CH in furnace gas 4 Calculated so that H 2 O and CH 4 The molar ratio is 1.0:1;

[0059] (3), one-stage methanation reaction: after the purified coke oven gas is mixed with water vapor, it enters the first-stage methanation reaction furnace, and under the action of a nickel catalyst, a first-stage methanation reaction is carried out; after the first-stage reaction...

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Abstract

The invention discloses a method for synthesizing methane by utilizing oven gas. Product gas with methane concentration of more than 90 percent is obtained through the main steps of purifying to remove impurities, compressing to exchange heat, adding water vapor, first stage of methanation reaction, second stage of methanation reaction, third stage of methanation reaction, PSA methane separation and the like. By adopting the method and utilizing the oven gas as raw materials, synthetic natural gas with high content of methane, low content of impurities and high heating value can be obtained, which is favorable to protecting the environment, saving energy and developing new energy; in addition, in the method, the addition of appropriate water vapor in the raw materials of oven gas before the fist sage of reaction properly inhibits the depth of the methanation reaction, reduces the heat amount released in the whole reaction process, conduces the cooling of the gas after the reaction and prevents the occurrence of carbon deposition reaction to devitalize the activity of a catalyst, thus being beneficial to the continuous normal operation of the whole synthesizing process.

Description

technical field [0001] The invention belongs to the application technical field of coke oven gas, and in particular relates to a method for synthesizing methane by using coke oven gas. Background technique [0002] my country's fossil energy is limited. Among the world's proven reserves, natural gas accounts for only 0.9%, oil accounts for 2.7%, and coal accounts for 15%. At present, my country's natural gas resources are about 54 trillion cubic meters, and the recoverable resources are 10-12 trillion cubic meters. According to the population statistics in 2002, the remaining recoverable reserves of natural gas per capita in my country is only equivalent to 6% of the world average level. [0003] On the other hand, China is the main production place of coke in the world, and coke oven gas is a combustible gas obtained by the by-product of the coal coking process (that is, a by-product in the coke production process). Coking coal quality and coking process conditions vary. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C1/04
CPCY02P20/10
Inventor 吴且毅卿涛颜智
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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