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CPOTE2022 logo
7th International Conference on
Contemporary Problems of Thermal Engineering
Hybrid event, Warsaw | 20-23 September 2022

Abstract CPOTE2022-1058-A

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Power and gas: a novel heat/cold recovery solution applied to the Świnoujście LNG regasification terminal

Nicola DI MICHELE, University of Florence, Italy
Pietro UNGAR, University of Florence, Italy
Romeo BANDINELLI, University of Florence, Italy
Wojciech KOSTOWSKI, Silesian University of Technology, Poland
Giampaolo MANFRIDA, University of Florence, Italy
Daniele FIASCHI, University of Florence, Italy
Lorenzo TALLURI, University of Florence, Italy

Nowadays, reducing GHG production in energy conversion represents one of the major global challenges. Success will occur through the ecological transition, in which natural gas will be one of the main actors. In Poland, over half of the electricity production comes from hard coal, and there is thus a considerable potential for decarbonization switching to natural gas. Presently, the fluctuations in natural gas price and the market availability of low-price coal slow down this transition; within this context, Liquefied Natural Gas (LNG) plays a key role. In this work, a proposal for a novel heat/cold recovery solution for the LNG regasification terminal of Świnoujście (Poland) is examined. The configuration examined consist of a plant with a closed-loop cryogenic power cycle operating with nitrogen, which is integrated in the LNG regasification process; additional power is produced through the recovery of the heat from the exhaust flow of a gas turbine (using part of the regassified natural gas stream). Therefore, the proposed plant has the dual purpose of regasifying and producing electricity, integrating the recovery of the LNG’s cold exergy which is otherwise destroyed. Presently, the Świnoujście terminal has a regasification capacity of about 5 billion m3 per year and uses Submerged Combustion Vaporizers (SCV) technology. The power plant here proposed is sized to cover a similar capacity, using 2 SIEMENS SGT800 gas turbine units; the possibility of indirect precooling of the GT inlet air is also considered and its advantage demonstrated. An economic analysis of the plant is carried out and the attractiveness of the proposal is shown, also taking into account the Świnojście seasonality (ambient air and seawater) and the associated off-design. Finally, an exergo-economic analysis of the whole power plant is carried out, highlighting the most critical components of the developed configurations. The results include the calculation of the cost of the products – electricity and the marginal cost of the regasified natural gas – depending on the seasonal operation.

Keywords: Thermodynamics, Economic assessment, LNG regasification, Gas turbine, Advanced exergetic analysis