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Methanation method for synthesizing substitute natural gas by using industrial hydrocarbon exhaust gas

A technology to replace natural gas and hydrocarbon industries, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of low utilization of hydrocarbon resources, high operating costs, and poor efficiency

Active Publication Date: 2013-07-10
THE NORTHWEST RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, the present invention aims at the disadvantages of low utilization of hydrocarbon resources, large equipment investment, high operating cost and poor benefit in the above method for synthesizing methane, and proposes a new rational utilization method including coke oven gas, yellow phosphorus tail gas, calcium carbide furnace gas, A new way of hydrocarbon industry tail gas including steelmaking converter gas, acetylene tail gas and semi-coke tail gas

Method used

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  • Methanation method for synthesizing substitute natural gas by using industrial hydrocarbon exhaust gas
  • Methanation method for synthesizing substitute natural gas by using industrial hydrocarbon exhaust gas
  • Methanation method for synthesizing substitute natural gas by using industrial hydrocarbon exhaust gas

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Embodiment 1

[0091] Embodiment 1: Synthesis of substitute natural gas by tail gas of hydrocarbon industry

[0092] According to the method described in the specification sheet of this application, the hydrocarbon industrial tail gas from a coking plant used in this embodiment was analyzed, and the analysis results are listed in Table 1:

[0093] Table 1: Analysis results of gas composition of tail gas raw material gas in hydrocarbon industry

[0094]

[0095] According to the data listed in Table 1, the contents of hydrogen, carbon monoxide and carbon dioxide meet the relational formula (H 2 -3CO) / CO 2 =4 requirements.

[0096] The implementation steps of this embodiment are as follows:

[0097] The purified hydrocarbon industrial tail gas that removes its various mechanical impurities is preheated by the preheater 6 to reach a temperature of 250°C, and then enters the first-stage methanation reactor 1, at an inlet temperature of 280°C, an inlet pressure of 3.0MPa, and an outlet temp...

Embodiment 2

[0104] Embodiment 2: Synthesis of substitute natural gas by tail gas of hydrocarbon industry

[0105] According to the method described in the specification sheet of this application, the hydrocarbon industrial tail gas from a chemical plant used in this embodiment was analyzed, and the analysis results are listed in Table 3:

[0106] Table 3: Gas Composition Analysis Results of Hydrocarbon Industry Tail Gas Raw Gas

[0107]

[0108] According to the data listed in Table 3, the contents of hydrogen, carbon monoxide and carbon dioxide meet the relational formula (H 2 -3CO) / CO 2 =4 requirements.

[0109] The implementation steps of this embodiment are as follows:

[0110] The purified hydrocarbon industrial tail gas that removes its various mechanical impurities is preheated by the preheater 6 to reach a temperature of 200°C, and then enters the first-stage methanation reactor 1 at an inlet temperature of 230°C, an inlet pressure of 1.0MPa, and an outlet temperature of 350...

Embodiment 3

[0117] Embodiment 3: Synthesis of substitute natural gas by tail gas of hydrocarbon industry

[0118] According to the method described in the specification sheet of this application, the hydrocarbon industrial tail gas from a coke plant used in this embodiment was analyzed, and the analysis results are listed in Table 5:

[0119] Table 5: Gas Composition Analysis Results of Hydrocarbon Industry Tail Gas Raw Gas

[0120]

[0121] According to the data listed in Table 5, the contents of hydrogen, carbon monoxide and carbon dioxide meet the relational formula (H 2 -3CO) / CO 2 =4 requirements.

[0122] The implementation steps of this embodiment are as follows:

[0123] The purified hydrocarbon industrial tail gas that removes its various mechanical impurities is preheated by the preheater 6 to a temperature of 300°C, and then enters the first-stage methanation reactor 1, at an inlet temperature of 350°C, an inlet pressure of 5.0MPa, and an outlet temperature of 650°C , The...

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Abstract

The invention relates to a methanation method for synthesizing substitute natural gas by using industrial hydrocarbon exhaust gas. The methanation method comprises the following steps of: carrying out third-order or fourth-order methanation reaction on the feed gas of the industrial hydrocarbon exhaust gas; thermally recycling; and cooling and separating to produce a qualified synthetic natural gas product. CO and CO2 in the industrial hydrocarbon exhaust gas are completely converted into methane to achieve the purpose of zero emission of CO2. According to the methanation method, the gas passes through a multistage methane reactor once, CO conversion and CO2 separation are not needed, meanwhile, a segmented cycle and a compressor are not needed for the process gas, thus the investment cost and the operation cost can be greatly reduced; the process flow is simple, reliable and efficient; the operation is convenient and stable, the temperature is easy to control; the energy consumption is low; and the economic benefit is obvious. The synthetic natural gas produced by using the industrial hydrocarbon exhaust gas meets the international standards, and can be directly used for producing compressed natural gas and liquefied natural gas.

Description

【Technical field】 [0001] The invention belongs to the technical field of synthesizing substituted natural gas from tail gas of hydrocarbon industry. More specifically, the present invention relates to a methanation method for synthesizing substitute natural gas from hydrocarbon industry tail gas. 【Background technique】 [0002] my country's coking, calcium carbide, blue carbon, steelmaking and other industries are developed, and a large amount of industrial tail gas is produced as a by-product. These industrial tail gases rich in carbon and hydrogen cannot be effectively used, which not only causes waste of resources, but also pollutes the environment. If these hydrocarbon industrial tail gases are used as raw materials to synthesize substitute natural gas, it will not only turn waste into treasure, but also save energy and reduce emissions, which will have high economic and social benefits. [0003] The methanation reaction of synthetic natural gas is as follows: CO+3H 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 张勇周晓奇李速延房根祥齐小峰高超张睿
Owner THE NORTHWEST RES INST OF CHEM IND
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