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Cryogenic method for preparing LNG (liquefied natural gas) from coke oven gas

A coke oven gas and cryogenic technology, applied in the field of LNG preparation, can solve the problems of high energy consumption of mixed refrigeration, affecting the operation of compressors, etc., and achieve the effects of increasing production, improving operating performance, and reducing operating costs

Pending Publication Date: 2022-06-03
SD STEEL RIZHAO CO LTD
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Problems solved by technology

[0004] Aiming at the problems of high energy consumption of hybrid refrigeration and affecting the operation of compressors in the prior art, the present invention provides a cryogenic method for preparing LNG from coke oven gas, which saves the refrigeration cost of the compressor and improves the operation performance of the compressor

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  • Cryogenic method for preparing LNG (liquefied natural gas) from coke oven gas

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Embodiment 1

[0024] Coke oven gas of the present invention prepares LNG cryogenic method, comprises the following steps, as figure 1 , the refrigerant temperature is 30°C, after pressurization in the MRC mixed refrigerant compressor 2, the pressurized pressure of the MRC mixed refrigerant compressor 2 is 3.0MPaG, and the pressurized refrigerant enters the liquefaction cold box through the circulation pipe 3 4. Heat exchange. The liquefaction cold box 4 has a plate-fin heat exchanger inside, and the plate-fin heat exchanger is arranged on the circulation pipe 3. The liquefaction cold box 4 is provided with an inlet port and an outlet port. The inlet port is connected to methane gas for Refrigeration and liquefaction of methane gas, when methane gas enters the liquefaction cold box 4, the temperature is 40°C, after being pressurized by the MRC mixed refrigerant compressor 2, the refrigerant is throttled and cooled in the liquefaction cold box 4, and the temperature at the bottom of the liquef...

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Abstract

The invention relates to the technical field of LNG (liquefied natural gas) preparation, in particular to a cryogenic method for preparing LNG from coke oven gas, which comprises the following steps: a refrigerant is pressurized in an MRC mixed refrigerant compressor and then enters a liquefaction cold box for heat exchange through a circulating pipeline, and the refrigerant after heat exchange sequentially enters a denitrification tower and an inlet separator; and finally, the refrigerant enters the MRC mixed refrigerant compressor through the circulating pipeline to be pressurized again, the refrigerant is a mixed refrigerant, and the mixed refrigerant comprises the following components in percentage by weight: 12.12% of N2, 43.18% of CH4, 21.7% of C2H4, 12.5% of C3H8 and 8.6% of C5H12. By optimizing the component proportion of the mixed refrigerant, the refrigeration cost of the compressor is saved, and the operation performance of the compressor is improved.

Description

technical field [0001] The invention relates to the technical field of LNG preparation, in particular to a cryogenic method for preparing LNG from coke oven gas. Background technique [0002] In the coke oven gas preparation LNG cryogenic liquefaction process, the mixed refrigerant refrigeration compressor is connected to the liquefaction cold box, and the methane-rich gas in the upper section is cooled to below -162°C, and the hydrogen and nitrogen components are separated to form LNG. The main source of cooling capacity of the cryogenic liquefaction unit is the MRC mixed refrigerant compressor. According to the difference in the boiling point of the five refrigerants, the circulating step refrigeration is carried out in the cold box. Propane and isopentane participate in the refrigeration of the upper part of the cold box, and ethylene participates in the middle part of the cold box. Refrigeration, methane and nitrogen participate in the refrigeration of the lower part of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/00F25J1/02
CPCF25J1/0092F25J1/0212F25J1/0022F25J2270/902F25J2280/02F25J2210/14F25J2270/66F25J2215/04F25J3/0219F25J3/0233
Inventor 冀传玖张满张运生许保明李艳涛张守强刘杰李康刘玉斌沈传新马同银姚琅徐峰善杨煜磊初勇郑雯
Owner SD STEEL RIZHAO CO LTD
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