The operation limitation of the two-stage reliquefaction cycle employed on board the ethylene carrier

• Autorzy: Nanowski D.

Identyfikatory

DOI

10.5604/12314005.1217248

• Języki publikacji: EN

Abstrakty

EN

Ethylene, propane, commercial propane or HD-5 is cargoes very often carried by sea. In order to reduce the time of loading and later cooling down to required parameters of temperature and pressure in the cargo tanks two-stage reliquefaction cycle is used. For above-mentioned cargoes, two-stage cycle with liquid subcooling and interstage cooler is one of the most often utilized. In this paper operation of this cycle is discussed, based on parameters of the reciprocating cargo compressor and its cycle used on board the one of the biggest – 21 500 m3 – ethylene carrier in the world. It is explained how some vapour mixtures decrease cooling rate during reliquefaction of the cargo and some parameters of pressure and temperature of these mixtures are calculated with help of ProSimPlus – thermodynamic simulator. In this way, changes of the mixtures composition across reliquefaction plant are discussed. Increased pressure of the cargoes condensing as a way of solving of explained problem is analysed. Three stage – cycle of reliquefaction plant used for pure propane or ethylene is shown and some of its disadvantages are explained. Based on this discussion, three-stage cycle with liquid injection is proposed to fulfil operation requirements of the cargoes and improve their loading and cooling processes on board the ethylene carrier. Analysis of refrigeration capacity for both cycles is carried out.

Słowa kluczowe

EN

ethylene carrier; cargo-cooling rate; reliquefaction plant

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2016
• Tom: Vol. 23, No. 4
• Strony: 359--365
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Nanowski D.

• Gdynia Maritime University Department of Marine Propulsion Plants Morska Street 81-87, 81-225 Gdynia, Poland tel.: [phone], fax: [phone]

Bibliografia

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• [3] Chebbi, R., Qasim, M., Darwish, N., Ashraf, M., Optimization and cost-oriented comparison of ammonia and propane-compression refrigeration for the recovery of Natural Gas Liquid, Energy Technology, Vol. 1, pp. 573-580, Wiley-VCH Verlag GmbH & Co., Wenheim 2013
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• [6] Nanowski, D., Transport mieszaniny propan-etan na statku LPG bez obiegu kaskadowego, Technika Chłodnicza i Klimatyzacyjna, Wyd. Masta, Vol. 5, Gdansk 2013. 364
• [7] Nanowski, D., The influence of condensing pressure of the ethylene carrier cascade cycle on its refrigeration capacity, Journal of Polish CIMAC, Vol. 9, Gdansk 2014.
• [8] Nanowski, D., Ocena wydajności chłodniczej obiegu skraplania ładunku z ekonomizerem i bez chłodzenia międzystopniowego w transporcie propanu na gazowcu LPG, Technika Chłodnicza i Klimatyzacyjna, Wyd. Masta, Vol. 12, Gdansk 2013.
• [9] ProSim SA Labege France, ProSimPlus ver. 3.5.10.0.
• [10] Serwiński, M., Zasady inżynierii chemicznej, Wydawnictwo Naukowo-Techniczne, Warszawa 1976.
• [11] Ship owner/Manufacturer data, London 2000
• [12] Vauldon, A., Liquefied gases. Marine transportation and storage, Witherby & Co, London 2000.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.