Applied Sciences (Jan 2020)

Overall Performance Evaluation of Small Scale LNG Production Processes

  • Maria Alessandra Ancona,
  • Michele Bianchi,
  • Lisa Branchini,
  • Francesco Catena,
  • Andrea De Pascale,
  • Francesco Melino,
  • Saverio Ottaviano,
  • Antonio Peretto

DOI
https://doi.org/10.3390/app10030785
Journal volume & issue
Vol. 10, no. 3
p. 785

Abstract

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The liquefied natural gas (LNG) is considered a viable solution to replace oil-based engines (common in heavy-duty truck and naval industry) reducing the environmental impact in the transport sector. Since liquefaction plants represent energy intensive processes, the best configurations/operation assessment is of primary importance. In this paper, a novel general procedure for the thermodynamic design and optimization, engineering design and off-design evaluation for small-scale LNG production systems is presented. The procedure can be used for the complete design and performance evaluation of plug & play facilities at filling stations for vehicles/boats, with the contemporary benefits of reducing pollutant emission in the city/port area and operating as electrical storage, coupled with renewable generators. Furthermore, the procedure has been applied to a case study (ferry boat operating at the main canal in the port of Ravenna, Italy), evaluating the optimal size for the integrated wind plant by minimizing the electricity introduction into the grid. The obtained results show 78 kW as optimal wind size, allowing the LNG plant to operate 187 h/year in design and 4720 h/year in off-design conditions, with electricity surplus around 33 MWh/year. A prototype will be installed to reduce pollutant emissions and test this technology as a storage option for renewable sources.

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