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LNG production technologies and process simulation

Fragkou Efsevia

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Year 2019
Type of Item Master Thesis
Bibliographic Citation Efsevia Fragkou, "LNG production technologies and process simulation", Master Thesis, School of Mineral Resources Engineering, Technical University of Crete, Chania, Greece, 2019
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The main goal of this master thesis is to present the refrigeration cycles used in the industry of LNG and simulate the most widely used for the liquefaction of natural gas. In this case, a comparison between the different refrigeration cycles was contacted and C3MR liquefaction process was selected to be modelled. The simulation was based on Air Products and Chemicals Inc. (APCI) technology as well as Swenson’s patent from 1977, ‘SINGLE MIXED REFRIGERANT, CLOSED LOOP PROCESS FOR LIQUEFYING NATURAL GAS’. Simulation was designed for a large scale project of 3 MTPA production of LNG and was conducted in Aspen HYSYS, a software widely used in the oil and gas industry, in collaboration with ASPROFOS Engineering that provided a license for the software. The outcome of the simulation was used to conduct a cost analysis of the liquefaction unit. The cost of each unit was compared to the total equipment cost and the conditions of each unit are given in detail, with compressors turning out to be the most expensive part of equipment, accounting for almost 81% of the total equipment cost.For concluding on the sustainability of the project, a financial analysis was also conducted over a thirty-year period and the results were very promising. A project of this magnitude turned out to be very efficient and profitable, with a payback period, only for the liquefaction unit and not the whole liquefaction plant, being less than a year.

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