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Energies 2018, 11(1), 202; https://doi.org/10.3390/en11010202

Optimization of Pure-Component LNG Cascade Processes with Heat Integration

1
Department of Engineering and Safety, UiT The Arctic University of Norway, 9037 Tromsø, Norway
2
Department of Engineering and Safety IVT, UiT The Arctic University of Norway, 9037 Tromsø, Norway
*
Author to whom correspondence should be addressed.
Received: 23 November 2017 / Revised: 4 January 2018 / Accepted: 10 January 2018 / Published: 15 January 2018
(This article belongs to the Section Energy Fundamentals and Conversion)
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Abstract

Liquefaction of natural gas is an energy-intensive process in which the energy efficiency depends on the number of compressors stages and the heat integration scheme. The aim of the study is to systematically evaluate process performance of pure component cascade processes, present optimized designs for all relevant numbers of compression stages and compare energy consumption between processes with differing levels of complexity. An original method for the evaluation of process performance is developed that utilizes as little human interaction as possible, making it suitable for optimization. This study shows that a pure-component cascade process using the three refrigerants R290, R1150 and R50 must have at least 11 stages to equal the energy efficiency of the best mixed refrigerant process. An optimized configuration for an 11-stage process scheme operating at 20 C ambient temperature is described in detail. View Full-Text
Keywords: LNG; cascade; optimization; genetic algorithm; heat integration; compressor stages LNG; cascade; optimization; genetic algorithm; heat integration; compressor stages
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Eiksund, O.; Brodal, E.; Jackson, S. Optimization of Pure-Component LNG Cascade Processes with Heat Integration. Energies 2018, 11, 202.

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