Space-division system for highly effectively using cold energy of liquefied natural gas

A technology of liquefied natural gas and air separation system, which is applied in liquefaction, cold treatment separation, refrigeration and liquefaction, etc. It can solve problems such as the limitation of conversion efficiency of booster turbo expander, safety threat of main cooling equipment, leakage and pollution of liquid nitrogen products, etc. Achieve the effect of sharp reduction of explosion-proof measurement and control components, avoid irreversible loss, and reliable process
CN101532768BActive Publication Date: 2011-05-25四川空分设备(集团)有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
四川空分设备(集团)有限责任公司
Publication Date
2011-05-25

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Abstract

The invention discloses a space-division system for highly effectively using cold energy of liquefied natural gas (LNG), comprising an LNG-nitrogen heat exchanger and a nitrogen-nitrogen heat exchanger. The pressure nitrogen is used as the closed circulating medium. The liquefied natural gas transfers the cold energy to the circulating nitrogen in the LNG-nitrogen heat exchanger. The circulating nitrogen transfers the cold energy to the pressure nitrogen of a space-division rectification tower in the nitrogen-nitrogen heat exchanger. The space division is not in contact with the circulating medium directly so as to avoid the danger caused by the natural gas entering a space-division device. The circulating nitrogen is cooled by the LNG cold energy so as to reduce the compression power consumption and obtain super-critical pressure nitrogen. In order to make up the disadvantage of the high-grade cold energy of LNG, one path of the high-pressure liquid nitrogen is throttled to the intermediate-pressure pressure, another path of the high-pressure liquid nitrogen is expanded by an expander to recover energy and then partially enters the LNG-nitrogen heat exchanger for deeply superbly cooling the high-pressure liquid nitrogen, and the rest liquid nitrogen enters the space-division system. The number of the channels of the heat exchanger is seldom, the flow organization is simple, safe and reliable, the operation and control are simple, the cost is low, and the application range is wide.
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Description

technical field

[0001] The invention relates to an air separation system for efficiently utilizing the cold energy of liquefied natural gas. Background technique

[0002] As one of the chemical energy sources, natural gas has been gradually promoted as the main energy pillar after coal and oil due to its huge reserves and low pollution, and has broad application prospects. The trade form of natural gas is mainly through pipeline transportation and liquefied natural gas (LNG) transportation. Before LNG enters the pipeline network of natural gas users, it needs to be gasified from the liquefied state to normal temperature. The gasification process will generate huge cooling capacity. By making full use of the gasification cold energy of LNG, the air separation device can greatly reduce power consumption, increase liquid production, and improve the competitiveness of products in the market. The air separation system using LNG cold energy generally saves more than 50% of electr...

Claims

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