Method for preparing liquefied natural gas from coke oven gas

A technology for liquefied natural gas and coke oven gas, which is applied in the direction of gas fuel, combustible gas purification, combustible gas chemical modification, etc., to achieve the effects of saving investment, simple process and reasonable process combination

Inactive Publication Date: 2008-10-08
SHENGHE RESOURCES HLDG CO LTD
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Problems solved by technology

Using coke oven gas as raw material to produce liquefied

Method used

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  • Method for preparing liquefied natural gas from coke oven gas

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Embodiment 1

[0033] 30000Nm from outside without preliminary desulfurization 3 / h coke oven gas, the pressure is about 5kPa, the temperature is 35℃, the centrifugal blower first boosts the pressure to 35kPa, and then enters the preliminary desulfurization process, adopts the desulfurization process of tannin extraction, and uses NH 3 As the alkali source, with PDS and tannin extract as the catalyst, the H in the coke oven gas 2 S can be removed to 30mg / Nm 3 the following. After the temperature swing adsorption TSA pretreatment process, the tar, naphthalene, benzene and NH contained in the gas are further removed. 3 , HCN and other impurities, tar + naphthalene ≤ 1mg / Nm 3 , Benzene + NH 3 +HCN≤12ppm.

[0034] The coke oven gas is compressed to 2.0MPa in three stages by a reciprocating piston compressor, and the temperature rises to about 180°C. -1 Under the conditions, using the BS-01 wide temperature hydrolysis catalyst produced by Quzhou Baichuan Catalyst Co., Ltd., the organic sulf...

Embodiment 2

[0040] The 30,000Nm that has been preliminarily desulfurized from the outside world 3 / h coke oven gas, the pressure is about 5kPa, the temperature is 35°C, the pressure is first raised to 20kPa by the Roots blower, and then enters the temperature swing adsorption TSA pretreatment process to further remove tar, naphthalene, benzene, NH contained in the gas 3 , HCN and other impurities, tar + naphthalene ≤ 1mg / Nm 3 , Benzene + NH 3 +HCN≤12ppm.

[0041] The coke oven gas is compressed to 2.0MPa by a centrifugal compressor, and the temperature rises to about 120°C. -1 Under the conditions, using the domestic T504 hydrolysis catalyst, the organic sulfur in the gas is hydrolyzed into H 2 S, the conversion rate of COS is over 95%.

[0042] Then enter the rough desulfurization process, adopt the low-temperature methanol washing (Rectisol) process for deep desulfurization (simultaneous decarbonization), the CO in the gas 2 ≤10ppm,H 2 S2 S content≤0.1ppm, NH 3 +HCN≤7ppm.

[004...

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Abstract

Disclosed is a method which uses coke-oven gas as the raw material to produce liquefied natural gas; the method includes that the coke-oven gas is pretreated firstly to enable the tar, naphthalene and benzene impurities contained in the coke-oven gas to be purified deeply; and the purified coke-oven gas is processed with methanation reaction after compression and desulfurization; the liquefied natural gas product which contains CH4 with the content of more than 85% through the cryogenic separation process; the residual non-condensable gas is prepared to obtain the hydrogen with the purity of 99% through the PSA separation technique; the residual desorbed gas can be used as manufactured gas. The method which uses the coke-oven gas as the raw material to produce liquefied natural gas has the advantages of making full use of the compositions, saving energy, water and the investment, simple process and realizing the trinity coordinated development of economy, environment and energy sources.

Description

technical field [0001] The invention relates to a method for producing liquefied natural gas by using coke oven gas as raw material. Background technique [0002] Liquefied natural gas (LNG) is a new type of clean and efficient green energy, which has the advantages of large calorific value, high performance and convenient storage and transportation. The main component is methane (purity above 80%). LNG has both the flexibility of LPG and the relatively stable price of natural gas, and has the characteristics of being completely interchangeable with pipeline natural gas. Therefore, although LNG has not appeared in my country for a long time, it has already shown its strong vitality and good market prospects. It can not only be used as a peak-shaving and backup gas source in big cities, but also be used for gasification of LNG communities in small and medium-sized towns, LNG and L-CNG gas vehicles, bottled LNG, LNG refrigeration, industrial gas, etc. [0003] At present, th...

Claims

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Application Information

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IPC IPC(8): C10L3/10C10K1/00C10K3/00
CPCY02P20/10
Inventor 杜文广刘守军程加林何小刚张智聪
Owner SHENGHE RESOURCES HLDG CO LTD
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