Process for producing liquefied natural gas by using coke-oven gas

A technology for liquefied natural gas and coke oven gas, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of large volume of natural gas, low methane yield, and high logistics cost, and achieves improved economic benefits, reduced production costs, and reduced environmental The effect of pollution

Active Publication Date: 2014-09-10
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there have been patents disclosing the technology related to the production of liquefied natural gas from coke oven gas. For example: CN195 2082A uses the pressure swing adsorption method to separate and recondense the compressed coke oven gas to produce LNG. The methane gas contained in the furnace gas does not make full use of the CO and CO in the coke oven gas 2 and H 2 , so that the methanation reaction produces methane, resulting in a waste of resources; CN10170 9237 A

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] The coke oven gas from the coking plant, the methane-rich gas separated by cryogenic liquefaction and the vaporized gas from the liquefied natural gas storage tank under 30KpaG are uniformly mixed; it is sent to the water-jet screw compressor for two-stage compression, so that the pressure of the mixed raw gas is reduced by 30KpaG The pressure is increased to 0.9MpaG; then the impurities tar, benzene, naphthalene, ammonia and hydrogen cyanide are removed by temperature swing adsorption; the purge gas used in temperature swing adsorption comes from the mixed raw gas after pretreatment, and the amount is 1 of the volume of the mixed raw gas / 10, the purge gas is treated by electric coke catching and benzene naphthalene washing, and then returned to the coking plant as fuel gas.

[0026] The mixed raw material gas is then adsorbed by iron oxide to remove hydrogen sulfide from the mixed raw material gas, and the mixed raw material gas is subjected to iron mol...

Example Embodiment

[0029] Example 2:

[0030] The coke oven gas from the coking plant, the methane-rich gas from the cryogenic liquefaction separation, the boil-off gas from the liquefied natural gas storage tank, and about 2692Nm from the chemical plant under 30KpaG 3 / h with CO 2 85% (V / V%) exhaust gas is uniformly mixed; it is sent to the water-jet screw compressor for two-stage compression, so that the pressure of the mixed raw gas is increased from 30KpaG to 0.9MpaG; then the impurities are removed by temperature swing adsorption, tar, benzene, Naphthalene, ammonia and hydrogen cyanide; the purge gas used in temperature swing adsorption comes from the pre-treated mixed raw material gas, and the amount is 1 / 10 of the volume of the mixed raw gas. The purge gas is treated by electric coke capture and benzene naphthalene washing Go back to the coking plant to make fuel gas.

[0031] The mixed raw material gas is then adsorbed by iron oxide to remove hydrogen sulfide from the mixed raw material gas,...

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PUM

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Abstract

The invention discloses a process for producing liquefied natural gas by using coke-oven gas, and belongs to the field of liquefied natural gas production. The process comprises the steps of raw material mixing, initial compression, pretreatment, purification, recompression, methanation, drying for mercury removal, cryogenic liquefying and separation, storage of liquefied natural gas, and truck loading of liquefied natural gas. Compared with the prior art, the process for producing liquefied natural gas by using coke-oven gas disclosed by the invention can produce qualified liquefied natural gas by using coke-oven gas, and the liquefied natural gas can be conveniently transported and utilized, thereby enhancing the added value of the coke oven gas; the production cost is effectively reduced, the economic benefit is improved, and the environment pollution is reduced.

Description

technical field [0001] The invention relates to the field of liquefied natural gas production, in particular to a process for producing liquefied natural gas by using coke oven gas. Background technique [0002] my country is the world's largest coke producer, and the by-product coke oven gas produced every year is about 40-60 billion Nm 3 / Year. In typical coke oven gas composition, H 2 54~59% (volume fraction, the same below), CH 4 21~25%, CO 5~8%, CO 2 1.9~2.3%, C m h n 1.6~2.0%, N 2 2~6%,O 2 0.3-0.7%, and contains tar, benzene, naphthalene, ammonia, hydrogen cyanide, hydrogen sulfide, organic sulfur and other impurities. Coke oven gas contains more effective components, but also has many impurities. At present, most coke oven gas is used to produce methanol, dimethyl ether, hydrogen, ammonia and domestic gas after purification, and some of them are directly released. [0003] Liquefied natural gas, referred to as LNG, is mainly composed of methane. It is a ...

Claims

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Application Information

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IPC IPC(8): C10L3/10C10L3/08
Inventor 徐国峰李德强苗兴旺仇德朋郭雷王庆邹红杨同莲杨秀会王宏伟
Owner CHINA NAT OFFSHORE OIL CORP
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