A zonal non-equilibrium approach to model temperature gradients during ventless bottom filling of pressurized cryotanks for natural gas-powered ships

Jonas Thiaucourt, Pierre Marty, Jean-François Hetet, Pascal Robert and Etienne Delaire

Energy, 2019, vol. 188, issue C

Abstract: Liquefied Natural Gas (LNG) as a fuel is seen as a solution to curb harmful emissions in shipping and its quick uptake is now significant. New LNG bunkering scenarios are hence rising with a growing range of technical challenges. In this paper, a thermodynamic zonal model is established to assess the temperature gradients induced by a ventless bottom filling. The reservoir is divided into three control volumes. A condensation model at the liquid/vapor interface is proposed. Thermophysical properties are interpolated in tables allowing calculations with a good precision and a CPU time reduced of 68% compared to equation of state software direct calls. The non-equilibrium phenomenon of condensation blocking is highlighted. Then, the impact of the loading pressure is further investigated. As a result, it is shown that bottom filling rate at high pressure (around 11 bars absolute) can compete with vented filling techniques only if the tank can deal with strong spatial (liquid/vapor) and temporal temperature gradients, respectively of order 94.3 K and 0.19 K/s.

Keywords: LNG fuel; No-vent filling (NVF); Cryogenics; Gas fueled ship (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:188:y:2019:i:c:s036054421931727x

DOI: 10.1016/j.energy.2019.116033

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