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Method for preparing substitute natural gas by coal-based syngas

A technology for coal-based synthesis gas and natural gas substitutes, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of small production capacity, unsuitable for large-scale supply of natural gas, narrow application range, etc., and achieve the effect of low impurity content

Inactive Publication Date: 2012-02-08
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, coke oven gas methanation is mostly used in China to produce SNG. This method has a relatively narrow application range and a small production capacity, so it is not suitable for large-scale supply of natural gas.

Method used

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  • Method for preparing substitute natural gas by coal-based syngas
  • Method for preparing substitute natural gas by coal-based syngas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, the method for producing substitute natural gas by using coal-based synthesis gas is as follows, and the flow chart is shown in figure 1 :

[0020] After desulfurization and transformation of coal-based syngas, the composition (vol%) of the obtained mixed gas is: H 2 68, CH 4 9, CO 19, CO 2 3. The total sulfur content is less than 0.1ppm. Under the action of the nickel catalyst system supported by alumina, the first-stage methanation reaction is carried out to obtain a mixed gas with a methane content of about 45%. The pressure of the first-stage methanation reactor is about is 2.0MPa, the reactor inlet temperature is about 230°C; part of the mixed gas is returned to the raw material gas before the reactor to dilute CO and CO 2 concentration, the circulation ratio is about 1.2:1, and the raw material gas composition (vol%) after dilution is: H 2 41.5, CH 4 45, CO 8.5, CO 2 4.

[0021] The mixed gas composition (vol%) at the outlet of the fi...

Embodiment 2

[0024] In this example, the method for producing substitute natural gas by using coal-based synthesis gas is as follows, and the flow chart is shown in figure 1 :

[0025] After desulfurization and transformation of coal-based syngas, the composition (vol%) of the obtained mixed gas is: H 2 68, CH 4 9, CO 19, CO 2 3. The total sulfur content is less than 0.1ppm. Under the action of the nickel catalyst system with pseudo-boehmite as the carrier, the first-stage methanation reaction is carried out to obtain a mixed gas with a methane content of about 50%. The first-stage methanation reactor The pressure is about 5.0MPa, and the reactor inlet temperature is about 260°C; part of the mixed gas is returned to the raw material gas before the reactor to dilute the CO and CO 2 concentration, the circulation ratio is about 1:1, and the raw material gas composition (vol%) after dilution is: H 2 40,CH 4 47, CO 8, CO 2 4.

[0026] The mixed gas composition (vol%) at the outlet...

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Abstract

The invention belongs to the field of energy chemical industry, and discloses a method for preparing substitute natural gas by coal-based syngas; the method comprises the following steps: performing desulphurization and conversion of coal-based syngas, adding into a two-grade adiabatic reactor for a methanation reaction, allowing hydrogen in the coal-based syngas to react with carbon monoxide and carbon dioxide to generate methane, then performing condensation and separation to obtain substitute natural gas with more than 94% of methane. Natural gas prepared by the method has a high heat value and a low impurity content.

Description

technical field [0001] The invention belongs to the field of energy and chemical industry, and relates to a method for preparing substitute natural gas by using coal-based synthesis gas. Background technique [0002] With the rapid development of the world economy, the rapid increase of population, the continuous growth of energy consumption, the surge of greenhouse gas and various harmful substances emissions, the human living environment has been greatly challenged. In this situation, clean, high calorific value natural gas energy is being paid more and more attention, and the development of natural gas industry has become the best choice for all countries in the world to improve the environment and promote sustainable economic development. [0003] At present, natural gas accounts for 24.3% of the world's primary energy. Due to the shortage of natural gas resources and development in my country, the proportion of natural gas in primary energy is only about 4%, which is f...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 孟建魏士新蔡进蔡成伟张杰檀结东陈长新吴学其吴琳朱艳芳赵华
Owner CHINA PETROCHEMICAL CORP
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