The influence of incondensible gases on the refrigeration capacity of the reliquefaction plant during ethylene carriage by sea

• Autorzy: Nanowski D.

Identyfikatory

DOI

10.5604/12314005.1216588

• Języki publikacji: EN

Abstrakty

EN

This paper presents a performance of the reliquefaction cascade plant during ethylene carriage by sea. Parameters of this plant are discussed because of dramatic low cooling rate of the cargo. Ability to decrease ethylene temperature from approx. minus 96°C to minus 103°C on board the ship is essential. Modern ethylene carriers are able to keep cooling rate about 2K per day, on the other hand old ones do it with rate approx. 0,2 K per day and require weeks to achieve proper temperature of ethylene for discharging. Of course, economic issue of such journey is not very satisfying but many factors influence on this. In this paper almost new one – nine months – old ship is considered, with capacity 21 000m3. Main reason of problem is analysed, including heat ingress through the cargo tanks insulation. Gassing-up of the ship is explained and influence of presence incondensable gases in the cargo tanks described. Operation of the reliquefaction plant is shown, especially with the vent valve of LPG condenser. Analysis of pressures in the cargo tanks is carried out – on board the ship and with help of ProSimPlus – thermodynamic simulator. Conclusions contain discussion of the reliquefaction plant problems and remarks what should be improved on board the ethylene carrier to avoid such problems.

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. 3
• Strony: 359--364
• Opis fizyczny: Bibliogr. 10 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

• [1] Bohdal, T., Charun, H., Czapp, M., Urządzenia chłodnicze sprężarkowe parowe, Wydawnictwo Naukowo-Techniczne, Warszawa 2003.
• [2] Gas Processors Suppliers Association, Engineering Data Book, FPS version, Tulsa Oklahoma 2004.
• [3] Li, Y., Jin, G., Zhong, Z., Thermodynamic analysis-based improvement for the boil-off gas reliquefaction process of liquefied ethylene vessel, Chemical Engineering Technology, Wiley-VCH Verlag GmbH&Co, Vol. 10, pp. 1759-1764, Wenheim 2012.
• [4] Mc Guire and White, Liquefied gas handling principles on ships and in terminals, Witherby&Co, London 2000.
• [5] Nanowski, D., Gas plant of ethylene gas carrier and two stage compression optimization of Ethylene as a cargo based on thermodynamic analysis, Journal of Polish CIMAC, Vol. 7, pp. 183-190, Gdansk 2012.
• [6] Nanowski, D., Wybrane parametry procesów termodynamicznych rzeczywistego obiegu kaskadowego wykorzystywanego do morskiego transportu etylenu, Technika Chłodnicza i Klimatyzacyjna, Wyd. Masta, Vol. 4, pp. 182-185, Gdańsk 2012.
• [7] ProSim SA Labege France, ProSimPlus ver. 3.5.10.0.
• [8] Serwiński, M., Zasady inżynierii chemicznej, Wydawnictwo N-T, Warszawa 1976.
• [9] Ship owner/Manufacturer data, London 2015.
• [10] 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.