Knowledge based decision making method for the selection of mixed refrigerant systems for energy efficient LNG processes

Title
Knowledge based decision making method for the selection of mixed refrigerant systems for energy efficient LNG processes
Author(s)
이문용칸모드샤리크이상규[이상규]Rangaiah[Rangaiah]
Keywords
NATURAL-GAS LIQUEFACTION; OPTIMAL-DESIGN; OPTIMIZATION; PERFORMANCE; PLANT; CYCLE
Issue Date
201311
Publisher
ELSEVIER SCI LTD
Citation
APPLIED ENERGY, v.111, pp.1018 - 1031
Abstract
Mixed refrigerant (MR) systems are used in many industrial applications because of their high energy efficiency, compact design and energy-efficient heat transfer compared to other processes operating with pure refrigerants. The performance of MR systems depends strongly on the optimum refrigerant composition, which is difficult to obtain. This paper proposes a simple and practical method for selecting the appropriate refrigerant composition, which was inspired by (i) knowledge of the boiling point difference in MR components, and (ii) their specific refrigeration effect in bringing a MR system close to reversible operation. A feasibility plot and composite curves were used for full enforcement of the approach temperature. The proposed knowledge-based optimization approach was described and applied to a single MR and a propane precooled MR system for natural gas liquefaction. Maximization of the heat exchanger exergy efficiency was considered as the optimization objective to achieve an energy efficient design goal. Several case studies on single MR and propane precooled MR processes were performed to show the effectiveness of the proposed method. The application of the proposed method is not restricted to liquefiers, and can be applied to any refrigerator and cryogenic cooler where a MR is involved. (C) 2013 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/28577http://dx.doi.org/10.1016/j.apenergy.2013.06.010
ISSN
0306-2619
Appears in Collections:
공과대학 > 화학공학부 > Articles
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