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Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
Email:
cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Air Separation Process by Usage of LNG Cold Energy and Its Performance

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Key Words： LNG； Cold energy； Air separation process； Exergy analysis； Aspen Plus software； Process simulation

Abstract：Conventional air separation method applies high pressure air cooling and expansion refrigeration to provide the cooling capacity required in air separation system and a good deal of electricity and water is needed in gas compression process. If LNG cryogenic cold energy is used in air separation system， energy consumption per unit product will be greatly reduced. From the angle of thermodynamics， pointed out is the rationality of LNG cold energy recycling way. In order to recover LNG cold energy and reduce power consumption of the air separation system， improved is the process of the high-quality LNG cryogenic cold energy used for air separation. Introduced are such technological process and its characteristics and applied is Aspen Plus software to simulate the process and selected is Peng-Robinson equation as physical property method and the results show that energy consumption of unit liquid state product in the process is 0.3 kW·h·kg-1， far lower than 1.0kW·h·kg-1 in traditional air separation process.