Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel

Liquefied natural gas (LNG) tanker vessel is operated to carry natural gas at cargo temperature of around -163°C. The containment system is designed to allow heat to escape into the cargo area. Around 0.15% of boil-off gas (BOG) is typically present in the cargo volume per day. Thus, the cargoes fro...

Full description

Saved in:

Bibliographic Details
Main Author:	Rosli, Muhamad Shafrilnizam
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/50733/22/MuhamadShafrilnizamRosliMFKM2014.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.50733
record_format	uketd_dc
spelling	my-utm-ep.507332020-07-10T10:52:45Z Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel 2014-09 Rosli, Muhamad Shafrilnizam TJ Mechanical engineering and machinery Liquefied natural gas (LNG) tanker vessel is operated to carry natural gas at cargo temperature of around -163°C. The containment system is designed to allow heat to escape into the cargo area. Around 0.15% of boil-off gas (BOG) is typically present in the cargo volume per day. Thus, the cargoes from the loading terminal are not fully delivered to the client due to the BOG phenomenon. This thesis looks into the utilization of BOG in the boiler. Modem marine boilers installed onboard the LNG carriers are capable of burning 100% BOG or heavy fuel oil (HFO). It can also use both BOG and HFO in a dual fuel burning operation. A Malaysia International Shipping Corporation (MISC) Berhad vessel which has operated for five voyages and has the same shared route of loading and discharge port was identified as a sample. The data main source was from the vessel's engine log book. The investigation is conducted by profiling the steam system onboard. On further analysis, the estimated fuel costs and operating characteristics of the facility were determined, focusing on evaluating the fuel to steam conversion efficiency of the boiler. It was found that during the laden voyage, more energy saving of BOG was obtained as compared to HFO in the range of 72.9% to 97.6% whilst in the ballast voyage, less BOG was obtained in the range of7% to 75.9%. The percentage energy saved varies whereby the percentage is high when vessel encountered shorter routes or purposely more BOG been utilized through forced boil-off method. The plant efficiency is about the same regardless of the type of fuel burnt in the boiler, whether it is burning combined BOG and HFO, 100% BOG or 100% HFO. The only difference is the amount of fuel burnt in the boiler. Hence, it is the owner best interest to decide which fuel to use that provides lesser fuel consumption and less cost. 2014-09 Thesis http://eprints.utm.my/id/eprint/50733/ http://eprints.utm.my/id/eprint/50733/22/MuhamadShafrilnizamRosliMFKM2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:86432 masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Rosli, Muhamad Shafrilnizam Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel
description	Liquefied natural gas (LNG) tanker vessel is operated to carry natural gas at cargo temperature of around -163°C. The containment system is designed to allow heat to escape into the cargo area. Around 0.15% of boil-off gas (BOG) is typically present in the cargo volume per day. Thus, the cargoes from the loading terminal are not fully delivered to the client due to the BOG phenomenon. This thesis looks into the utilization of BOG in the boiler. Modem marine boilers installed onboard the LNG carriers are capable of burning 100% BOG or heavy fuel oil (HFO). It can also use both BOG and HFO in a dual fuel burning operation. A Malaysia International Shipping Corporation (MISC) Berhad vessel which has operated for five voyages and has the same shared route of loading and discharge port was identified as a sample. The data main source was from the vessel's engine log book. The investigation is conducted by profiling the steam system onboard. On further analysis, the estimated fuel costs and operating characteristics of the facility were determined, focusing on evaluating the fuel to steam conversion efficiency of the boiler. It was found that during the laden voyage, more energy saving of BOG was obtained as compared to HFO in the range of 72.9% to 97.6% whilst in the ballast voyage, less BOG was obtained in the range of7% to 75.9%. The percentage energy saved varies whereby the percentage is high when vessel encountered shorter routes or purposely more BOG been utilized through forced boil-off method. The plant efficiency is about the same regardless of the type of fuel burnt in the boiler, whether it is burning combined BOG and HFO, 100% BOG or 100% HFO. The only difference is the amount of fuel burnt in the boiler. Hence, it is the owner best interest to decide which fuel to use that provides lesser fuel consumption and less cost.
format	Thesis
qualification_level	Master's degree
author	Rosli, Muhamad Shafrilnizam
author_facet	Rosli, Muhamad Shafrilnizam
author_sort	Rosli, Muhamad Shafrilnizam
title	Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel
title_short	Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel
title_full	Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel
title_fullStr	Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel
title_full_unstemmed	Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel
title_sort	energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2014
url	http://eprints.utm.my/id/eprint/50733/22/MuhamadShafrilnizamRosliMFKM2014.pdf
_version_	1747817523182567424

Energy and economic analysis using boil-off gas onboard liquefied natural gas tanker vessel

Similar Items