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Production process of liquefied natural gas

A technology of liquefied natural gas and production process, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of unreported sulfur-resistant methanation production process, achieve remarkable energy-saving effects, reduce production costs, and reduce equipment investment and expenses Effect

Active Publication Date: 2014-02-26
青岛联信催化材料有限公司 +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] Synthetic natural gas from coke oven gas is a high value-added product, and its cost is more competitive than that of coal-based natural gas. Bring huge economic benefits to enterprises, but there is no industrialized coke oven gas to natural gas device in China
[0004] In the prior art, there is a non-sulfur-tolerant methanation production process of coke oven gas synthetic natural gas, but there is no report on the sulfur-tolerant methanation production process

Method used

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  • Production process of liquefied natural gas

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Experimental program
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Effect test

Embodiment 1

[0022] The first level of sulfur resistance-methanation: coke oven gas with a CO dry basis content of 8.5% first enters the detoxification tank to remove dust and other impurities, and then exchanges heat with the gas after the first-level methanation reaction to 450°C, and then enters the second-level The first-stage sulfur-resistant methanation reaction is carried out in one reactor. The hot spot temperature of the first-stage reactor bed is 650°C, the reaction pressure is 2.5MPa, and the dry basis content of CO in the outlet gas of the first-stage reactor is 4.1%; CH4 dry basis The content is 38.2%.

[0023] The gas after primary methanation is heat-exchanged with the coke oven gas at the inlet of the first-stage reactor, and the temperature is lowered to 450°C by the medium-pressure steam produced by the waste boiler, and enters the second-stage reactor for sulfur-resistant methanation reaction. The hot spot temperature of the first-stage reactor bed is 600°C, the dry basi...

Embodiment 2

[0027] The first level of sulfur resistance-methanation: the coke oven gas with a CO dry basis content of 9.0% first enters the detoxification tank to remove dust and other impurities, and then exchanges heat with the gas after the first-level methanation reaction to 450°C, and then enters the second-level The first-stage sulfur-resistant methanation reaction is carried out in one reactor. The hot spot temperature of the first-stage reactor bed is 650°C, the reaction pressure is 3.6MPa, and the dry basis content of CO in the outlet gas of the first-stage reactor is 3.6%; CH4 dry basis The content is 39.1%.

[0028] The gas after primary methanation exchanges heat with the inlet coke oven gas entering the first-stage reactor, and is cooled to 450°C by the medium-pressure steam produced by the waste boiler, and enters the second-stage reactor for sulfur-resistant methanation reaction. The hot spot temperature of the secondary reactor bed is 600°C, the dry basis content of CO at ...

Embodiment 3

[0032] The first level of sulfur resistance-methanation: the coke oven gas with a CO dry basis content of 10.1% first enters the detoxification tank to remove dust and other impurities, and then exchanges heat with the gas after the first-level methanation reaction to 450°C, and then enters the second-level The first-stage sulfur-resistant methanation reaction is carried out in one reactor. The hot spot temperature of the first-stage reactor bed is 670°C, the reaction pressure is 2.5MPa, and the dry basis content of CO in the outlet gas of the first-stage reactor is 4.3%; CH4 dry basis The content is 38.1%.

[0033] The gas after primary methanation exchanges heat with the inlet coke oven gas entering the first-stage reactor, and is cooled to 450°C by the medium-pressure steam produced by the waste boiler, and enters the second-stage reactor for sulfur-resistant methanation reaction. The hot spot temperature of the secondary reactor bed is 600°C, and the dry content of CO and ...

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Abstract

The invention provides a production process of liquefied natural gas and particularly relates to a sulfur-resistance methanation production process for producing liquefied natural gas by taking coke-oven gas as a raw material. The production process at least comprises two stages of sulfur-resistant methanation processes. The volume content of dry-basis CO in outlet gas subjected to two-stage methanation is less than or equal to 1.0 percent, and the volume content of methane is more than or equal to 48 percent; gas discharged from a second reactor is subjected to high-pressure overheat steam through a spent pit, enters a desulfuration and decarburization device to remove H2S and CO2, then enters a low-temperature cold box and is subjected to methane liquefaction by the low-temperature cold box; gases, such as H2 and little CO can be further produced into more methane or used as other purposes in a carbon replenishing manner. Compared with a non-sulfur-resistant methanation process of coke-oven gas, the production process provided by the invention has the advantages of simple flow, remarkably low equipment cost and operation cost; after project implementation, the production cost of natural gas is further reduced; a relatively energy-saving production path is created for the coal gas making industry and coke-oven gas in China.

Description

technical field [0001] The invention provides a production process of liquefied natural gas, in particular a sulfur-resistant methanation production process for producing liquefied natural gas with coke oven gas as raw material. Background technique [0002] Coal, oil and natural gas are the three pillars of energy in the world today. my country is poor in oil and gas, but rich in coal resources. In recent years, with the rapid development of the national economy, natural gas, as a clean and efficient energy source, has rapidly increased its proportion in energy consumption. At present, the domestic demand for natural gas far exceeds the supply. Therefore, coal-to-natural gas technology can not only It meets the growing market demand, and is of great significance to my country's energy security, energy conservation and emission reduction. [0003] Synthetic natural gas from coke oven gas is a high value-added product, and its cost is more competitive than that of coal-based ...

Claims

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Application Information

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IPC IPC(8): C10L3/08C10L3/10
Inventor 纵秋云李袖章张晋肖杰飞荆宏建曲思秋孙波林彩虹
Owner 青岛联信催化材料有限公司
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