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Edition and Publication:
< Natural Gas and Oil > Editorial Department
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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:
610041
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Issue:ISSN 1006-5539
CN 51-1183/TE

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Simulation Research on Optimal Control in LNG Cooling Process

Author of the article:Wang Minjuan, Xu Yifei

Author's Workplace：1.Shaanxi LNG Investment Development Co., Ltd., 2.College of Computer Science, Zhejiang University 3.Department of Biosystems & Agricultural Engineering, Michigan State University

Key Words：LNG process control; Optimization control; Cryogenic exchanger

Abstract：In order to improve the energy conversion efficiency and reduce the energy consumption in the process of natural gas liquefaction, established is dynamic optimization model for energy saving based on mechanism according to natural gas liquefaction process and analyzed is the steady state behavior of the C3MR process. Determined is the optimization objective of high efficiency and energy saving in natural gas liquefaction process, explored are the auxiliary variables in optimization control, studied is the optimal behavior in steady state situation, searched are collocation and combination of control variables and controlled variables in the steady state situation and explore is the optimal collocation and combination of these variables with the optimal performance in such situation. The software HYSYS is applied for simulation test and the results show that temperature difference (TD) of MR streams between inlet and outlet of warm end is an important controlled variable for controlling energy saving efficiency in natural gas liquefaction process under steady state condition and the combination (T-MRV, TD-MRL) can make temperature difference (TD) loss become the least if LNG production is fixed at the same time of rapid return to steady state. Therefore, in natural gas liquefaction process, the proposed model can not only assure high energy conversion efficiency and can also reduce the energy consumption.