«Automation and Informatization of the fuel and energy complex»

Analysis of Brayton cycle energy efficiency during regasification of liquified natural gas

UDC: 536.423:621.1.018.4
DOI: -

Authors:

¹ Mendeleev Russian Chemical-Technology University, Moscow, Russia

Keywords: liquefied natural gas (LNG), regasification, Brayton cycle, cogeneration, modeling, optimization, specific work, net present value (NPV), payback period

Annotation:

The authors of the article investigate the main issues of developing energy-saving technical solutions for the process of liquefied natural gas (LNG) regasification based on the use of Brayton thermodynamic cycle on various working fluids: nitrogen, carbon dioxide – in normal and supercritical state. Technological schemes simulation was carried out in ChemCad. Specific work of the net cycle per unit of LNG consumption was chosen as a criterion of the optimal technical solution, which was determined on the basis of the unit power balance in the whole. Varying parameters when choosing the optimal solution were: working fluid temperature after LNG regasification, compressor outlet pressure, Brayton cycle turbine outlet pressure. In the course of computing experiments, optimal Brayton cycle operational parameters wore obtained on different working fluids. It is shown that a nitrogen-based Brayton cycle technique of LNG rectification is preferable due to its specific work indicator. A preliminary economic analysis was done to determine possible commercial applicability for the developed solution. To assess the commercial attractiveness of the developed technical solution a preliminary economic analysis was carried out to estimate NPV and payback period. Total investments volume was assumed to be equal to the capital costs for the Brayton cycle equipment. The calculations showed that investments payback period for a LNG regasification terminal with a productivity rate of 5 bln t/year made 3 years.

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