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A method for preparing liquefied natural gas by sulfur-resistant methanation of coke oven gas

A technology for sulfur-resistant methanation and liquefied natural gas, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of unspecified simplified desulfurization process, large energy consumption and equipment investment, and complicated process flow, so as to save equipment investment and energy consumption, saving investment and energy consumption, simple process

Inactive Publication Date: 2016-02-24
SEDIN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2012, my country's coke output reached 443 million tons, if one ton of coke produced 430m 3 Calculation of coke oven gas, the coke oven gas in that year alone reached 190.5 billion m 3 , of which about 70% of the coke oven gas is used for coke oven heating and domestic gas, while the remaining nearly 57 billion m 3 Coke oven gas has not been utilized, resulting in serious waste of resources and environmental pollution
Patent CN101391935A discloses a method for synthesizing methane from coke oven gas. Through steps such as purification and dust removal, compression heat exchange, addition of water vapor, three-stage methane and PSA separation of methane, the product gas with a methane concentration of more than 90% is obtained, but this invention also The complex process of multi-stage hydrogenation and multi-stage desulfurization is adopted, and no effective method for simplifying the desulfurization process is given
Although the above-mentioned patents have improved the natural gas yield and separation effect to a certain extent by optimizing the process, they have not fundamentally solved the problems of coke oven gas synthesis of natural gas, especially the complex process flow, energy consumption and equipment investment of liquefied natural gas.

Method used

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  • A method for preparing liquefied natural gas by sulfur-resistant methanation of coke oven gas
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  • A method for preparing liquefied natural gas by sulfur-resistant methanation of coke oven gas

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In this example, the catalysts used in sulfur-tolerant methanation reactor I and sulfur-tolerant methanation reactor II are the same, and the mass composition of the oxide is MoO 3 15wt%-Co 2 o 3 +La 2 o 3 10wt% / magnesium aluminum spinel 75wt% catalyst, active component MoO 3 and additive Co 2 o 3 +La 2 o 3 It is loaded on the carrier magnesium aluminum spinel by means of sol-gel, and the specific preparation method and process are shown in Example 6 of CN101733115A; the mass composition of the sulfur-resistant methanation catalyst used in the sulfur-resistant methanation reactor III is MoO 3 10wt%-La 2 o 3 30wt% / γ-Al 2 o 3 60 wt%, see CN102463118A Example 4 for the preparation method and process. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0034] (1) After deoiling, deamination, debenzene and naphthalene removal, it is composed of H 2 50.0%, CO8.0%, CO 2 4.0%, CH 4 27.0%, N 2 7.0% and C 2-4 The c...

Embodiment 2

[0038] In this embodiment, the catalyst used in the sulfur-tolerant methanation reactor I and the sulfur-tolerant methanation reactor II is the same, and its mass composition is MoO 3 27wt%-Co 2 o 3 +La 2 o 3 8wt% / magnesium aluminum spinel 65wt% catalyst, active component MoO 3 and additive Co 2 o 3 +La 2 o 3 Loaded on the carrier magnesium-aluminum spinel by impregnation, the specific preparation method and process refer to Example 14 of CN103495421A; the mass composition of the sulfur-resistant methanation catalyst used in the sulfur-resistant methanation reactor III is MoO 3 15wt% - ZrO 2 30wt% / CeO 2 -Al 2 o 3 55wt%, see CN102463118A Example 5 for the preparation method and process. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0039] (1) After deoiling, deamination, debenzene and naphthalene removal, it is composed of H 2 53.8%, CO7.3%, CO 2 3.7%, CH 4 25%, N 2 6.7% and C 2-4 The coke oven gas with 3.5...

Embodiment 3

[0043] In this example, the catalysts used in sulfur-tolerant methanation reactor I and sulfur-tolerant methanation reactor II are the same, and the mass composition of the oxide is MoO 3 10wt%-Co 2 o 3 5wt% / Al 2 o 3 -ZrO 2 85 wt% catalyst, active component MoO 3 and additive Co 2 o 3 Loaded on the carrier Al by co-precipitation 2 o 3 -ZrO 2 For specific preparation methods and techniques, see Example 3 of CN101733115A; the mass composition of the sulfur-resistant methanation catalyst used in the sulfur-resistant methanation reactor III is MoO 3 20wt%-CeO 2 +La 2 o 3 30wt% / Al 2 o 3 -ZrO 2 50 wt%, see CN102463118A Example 6 for the preparation method and process. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0044] (1) After deoiling, deamination, debenzene and naphthalene removal, it is composed of H 2 54.7%, CO6.9%, CO 2 3.5%, CH 4 25.6%, N 2 6.1% and C 2-4 The coke oven gas with 3.2% hydrocarbons fir...

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Abstract

The invention provides a method for preparing liquefied natural gas (LNG) through sulphur-tolerant methanation of coke-oven gas. The method is characterized by subjecting the coke-oven gas to direct three-stage methanation reactions on a supported molybdenum-based sulphur-tolerant methanation catalyst after removing the impurities such as oil, naphthalene, benzene and the like from the coke-oven gas, then removing the impurities such as sulphur, CO2, C2-4 hydrocarbons and the like once through rectisol, and finally separating N2, H2 and the like through one-time subzero liquefaction, thus obtaining the LNG with methane content higher than 97%. The method has the advantages of simple process flow, small equipment investment, low comprehensive energy consumption and excellent natural gas products.

Description

technical field [0001] The invention belongs to a method for preparing liquefied natural gas, in particular to a method for preparing liquefied natural gas by sulfur-resistant methanation of coke oven gas. Background technique [0002] my country is the world's largest coke producer, consumer and exporter. In 2012, my country's coke output reached 443 million tons, if one ton of coke produced 430m 3 Calculation of coke oven gas, the coke oven gas in that year alone reached 190.5 billion m 3 , of which about 70% of the coke oven gas is used for coke oven heating and domestic gas, while the remaining nearly 57 billion m 3 Coke oven gas has not been utilized, resulting in serious waste of resources and environmental pollution. Natural gas is a high-quality, efficient and safe clean energy. In recent years, with the rapid increase of natural gas demand in my country, the gap between domestic natural gas supply and demand has gradually increased, which in turn has restricted ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08C10L3/10
Inventor 张庆庚范辉崔晓曦李晓李德宝贾丽涛孙德魁史郭晓
Owner SEDIN ENG
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