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Cryogenic separating system for preparing liquefied natural gas with oven gas

A technology for liquefied natural gas and cryogenic separation, which is applied in the direction of cold treatment separation, refrigeration and liquefaction, liquefaction, etc., can solve the problem of high cost of refrigerant compressors, and achieve the effects of reduced equipment investment, high recovery rate, and good system stability

Active Publication Date: 2014-05-07
HANGZHOU ZHONGTAI CRYOGENIC TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the cryogenic separation of natural gas from coke oven gas uses a mixed refrigerant refrigeration cycle. The mixed refrigerant needs to increase the storage and transportation system of each refrigerant, and the cost of the refrigerant compressor is relatively high.

Method used

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  • Cryogenic separating system for preparing liquefied natural gas with oven gas

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Embodiment Construction

[0010] Such as figure 1 As shown, a cryogenic separation system for liquefied natural gas from coke oven gas in the present invention includes methane-hydrogen rectification tower T-101, methane-nitrogen rectification tower T-102, feed gas cooler E-201, nitrogen filter Cooler E-202, overhead condenser E-104 of methane-hydrogen rectification tower T-101, tower overhead condenser E-105 of methane-nitrogen rectification tower T-102, methane-nitrogen rectification tower Bottom reboiler E-106 of T-102, circulating nitrogen compressor C-101, hot end booster turbo expander ET-101, cold end booster turbo expander ET-102, J / T valve V -102, pressure reducing valve one V-101 and pressure reducing valve three V-103;

[0011] The raw material gas obtained by methanation treatment and pretreatment passes through the first cooling pipeline LY-1 of the raw material gas cooler E-201, the cooling pipeline of the bottom reboiler E-106, and the raw gas cooler The second cooling pipeline LY-2 of...

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Abstract

The invention discloses a cryogenic separating system for preparing liquefied natural gas with oven gas. The cryogenic separating system comprises a methane-hydrogen rectifying tower, a methane-nitrogen rectifying tower, a feed gas cooler, a nitrogen subcooler, a tower top condenser I of the methane-hydrogen rectifying tower, a tower top condenser II of the methane-hydrogen rectifying tower and a tower bottom reboiler of the methane-hydrogen rectifying tower constituting a cryogenic separating pipeline system, a hydrogen-rich recovering pipeline system and a nitrogen-rich pipeline system for natural gas, and further comprises a two-stage nitrogen expanding refrigerating circulation loop for supplying cold energy to the feed gas cooler and the nitrogen subcooler. The cryogenic separating system for preparing liquefied natural gas with oven gas has the advantages of low cost, small investment, stable system, easiness for operating and high natural gas recovering rate.

Description

technical field [0001] The invention relates to a system for producing liquefied natural gas from coke oven gas, in particular to a cryogenic separation system for producing liquefied natural gas from coke oven gas. Background technique [0002] Coke oven gas contains carbon monoxide, methane, hydrogen, nitrogen and other components, which belongs to medium calorific value gas. The main components of coke oven gas after methanation are methane, hydrogen, nitrogen and a small amount of ethane. The cost of producing natural gas from coke oven gas is more competitive than that of coal to natural gas. It is in line with the national energy policy and can be Fully and rationally utilize industrial exhaust gas resources, reduce greenhouse gas emissions, and at the same time bring huge economic benefits to enterprises. In the prior art, the cryogenic separation of natural gas from coke oven gas uses a mixed refrigerant refrigeration cycle, which requires additional storage and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02
CPCF25J3/0233F25J3/0223F25J3/0252F25J3/0257F25J2200/74F25J2215/04F25J2270/16F25J2270/42F25J2290/34
Inventor 廖江芬
Owner HANGZHOU ZHONGTAI CRYOGENIC TECHNOLOGY CORPORATION