20.500.12556/RUL-151702 Ageing of liquified natural gas during marine transportation and assessment of the boil-off thermodynamic properties During LNG storage and transportation by ship, a fraction of the LNG in the cryogenic tanks evaporates due to heat ingress through the insulation, resulting in boil-off gas (BOG) production and a change in LNG composition, a phenomenon known as LNG ageing. Common practice is to assume that BOG composition and related density are identical to the initial LNG or pure methane, resulting in inaccuracy in BOG mass flow measurements. This is particularly important regarding LNG shipping economics and the utilization of BOG as a fuel for ship propulsion. This work investigates the influence of LNG ageing on the produced BOG thermodynamic properties relevant to the mentioned inaccuracies’ estimation and correction. An established, simplified, dynamic boil-off model is utilized for the simulation of LNG and BOG properties’ changes during the voyage. Four cases represented by limiting the minimum and maximum values of methane and nitrogen content are used to estimate the general influence of the compositional variability over the whole range of practically possible LNG source mixtures. Research results provide an insight into the relevant BOG properties’ variability and confirm that BOG flow measurements should be corrected with dynamic model simulations results due to significant differences between the total BOG mixture and forced BOG mixture corresponding to the LNG composition. LNG shipping LNG ageing boil-off gas (BOG) LNG fueled vessel gas flow measurement ladijski transport staranje LNG uparjeni plin LNG pogon merjenje pretoka plina true false true Angleški jezik Slovenski jezik Članek v reviji 2023-10-17 13:37:32 2023-10-17 13:37:37 2023-10-18 03:40:13 0000-00-00 00:00:00 2023 0 0 23 str. iss. 10, art. 1980 Vol. 11 Oct. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 629.5.03:627.133 2077-1312 10.3390/jmse11101980 168777219 Perusko..._Ageing_of_liquified_natural_gas_during_marine_transportation_and_assessment_of_the_boil-off_thermodynamic_properties.pdf Perusko..._Ageing_of_liquified_natural_gas_during_marine_transportation_and_assessment_of_the_boil-off_thermodynamic_properties.pdf 1 C8EB5AB1BF2FD9E3C30D2BF0A55889EE 7029b0eb756afac10130257013103af5b729b713805597b5bbcd1f5c7aacf468 ced818f4-6ce1-11ee-bec4-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=176738 https://www.mdpi.com/2077-1312/11/10/1980 1 92a45b53-6ce1-11ee-bec4-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=176737 Fakulteta za strojništvo 0 0 0