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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
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Postal Code:
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Issue:ISSN 1006-5539
CN 51-1183/TE

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Research on LNG Cryogenic Energy Utilization Technology

Author of the article:Ding Yi, Zhu Jianlu, Wang Yufan

Author's Workplace：1.SINOPEC Qingdao LNG Co., Ltd.,2.College of Pipeline and Civil Engineering/Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety/ Qingdao Key Laboratory of Circle Sea Oil & Gas Storage and Transportation Technology, China University of Petroleum (Huadong) 3.Qingdao Energy and China Resources Gas Limited,

Key Words：LNG; Cryogenic energy utilization; Cascade utilization; Light hydrocarbons separation; Rubber comminution; Integration; Exergy analysis; Sensitivity

Abstract：In recent years, LNG has become more and more popular under the support and promotion of clean energy policy and the LNG cryogenic energy utilization technology has also become a research issue. In this paper, simulation and analysis were carried out for the process of light hydrocarbon separation by using LNG cryogenic energy in a large LNG terminal. The recovery rate is 93.43% for light hydrocarbons and the energy consumption of unit light hydrocarbon is 97kJ/kg. Sensitivity analysis is conducted for the process, studying the influence on process performance and obtaining the operating conditions and adaptability requirement of light hydrocarbon device. LNG cryogenic exergy utilization efficiency is relatively low with exergy analysis, about 23.82%. Then a process of LNG cryogenic energy cascade utilization is proposed with integrating the light hydrocarbon separation and the rubber cryogenic comminution according to the principle of energy cascade utilization. The cryogenic energy of lean LNG separated from light hydrocarbon device is used in rubber comminution device and can save 196.38 kWh of the refrigeration power by per ton LNG. It is concluded that the energy saving effect is remarkable in this process and the results of exergy analysis show that the utilization efficiency of LNG cryogenic exergy has been greatly improved in the integration process. It can realize the efficient utilization of cryogenic energy.