Parametric Analysis on Boil-Off Gas Rate inside Liquefied Natural Gas Storage Tank
DOI:
https://doi.org/10.15282/jmes.6.2014.10.0080Keywords:
Liquefied natural gas; boil-off gas; heat transfer; greenhouse emission; pollution.Abstract
Research into the environmental effect of greenhouse emissions is now intense. One of the sources contributing to the effect is boil-off gas (BOG) flaring into the atmosphere. BOG formation is caused by heat leakage from the liquefied natural gas (LNG) storage tank. Heat leakages are determined by the effectiveness of heat thermal transmittance of the structural tank and ambient condition. The objective of this present study is therefore to determine the relationship between heat thermal transmittance and ambient condition, and the boil-off rate for a specific 40,447m3 LNG tank size corresponding to a 160,000m3 LNG ship size. General estimations of the amounts of BOG generated are useful in determining the amount of BOG that will need to flare in order to control the greenhouse effect and the amount of pollution entering the environment. This study analyzes both the steady and unsteady behavior of heat transfer mechanisms using ANSYS Fluent software. Results show that dynamic transient simulation only takes effect on the first five days of a voyage. There is then a linear relationship between the investigated parameters of the boil-off rate of LNG. These linear relations are of the utmost use for LNG tank manufacturer and researchers requiring a preliminary view in order to determine LNG tank specification. The result obtained is also validated by studies by previous researcher.
References
Adom, E., Islam, S. Z., & Ji, X. (2010). Modeling of boil off gas in lng tanks: A case study. International Journal of Engineering and Technology, 2(4), 292-296.
Chen, Q.-S., Wegrzyn, J., & Prasad, V. (2004). Analysis of temperature and pressure changes in liquefied natural gas (lng) cryogenic tanks. Cryogenics, 44(10), 701-709.
Dimopoulos, G. G., & Frangopoulos, C. A. (2008). A dynamic model for liquefied natural gas evaporation during marine transportation. International Journal of Thermodynamics, 11(3), 123-131.
Duwig, C., Stankovic, D., Fuchs, L., Li, G., & Gutmark, E. (2007). Experimental and numerical study of flameless combustion in a model gas turbine combustor. Combustion Science and Technology, 180(2), 279-295.
Gharehghani, A., Hosseini, R., & Yusaf, T. (2013). Investigation of the effect of additives to natural gas on heavy-duty si engine combustion characteristics. Journal of Mechanical Engineering and Sciences, 5, 677-687.
Guyer, E. C. (1999). Handbook of applied thermal design: CRC press.
Hasan, M. F., Zheng, A. M., & Karimi, I. (2009). Minimizing boil-off losses in liquefied natural gas transportation. Industrial & engineering chemistry research, 48(21), 9571-9580.
Kreith, F., Manglik, R. M., & Bohn, M. S. (2001). Principles of heat transfer: Cengage Learning.
Ming-shun, Z., Bo-yang, L., & Yun-qiu, Z. (2009). Finite element analysis on temperature field of insulated cabin for lng carrier based on ansys. Paper presented at the Intelligent Computation Technology and Automation, 2009. ICICTA'09. Second International Conference on.
Querol, E., Gonzalez-Regueral, B., García-Torrent, J., & García-Martínez, M. (2010). Boil off gas (bog) management in spanish liquid natural gas (lng) terminals. Applied Energy, 87(11), 3384-3392.
Romero, J., & Mosquera, I. (2005, 26-30 September). Maritime transportation and exploitation of ocean and coastal resources. Paper presented at the Proceedings of the 11th International Congress of the International Maritime Association of the Mediterranean, Lisbon.
Shin, M. W., Shin, D., Choi, S. H., & Yoon, E. S. (2008). Optimal operation of the boil-off gas compression process using a boil-off rate model for lng storage tanks. Korean Journal of Chemical Engineering, 25(1), 7-12.
Yusaf, T., Baker, P., Hamawand, I., & Noor, M. M. (2013). Effect of compressed natural gas mixing on the engine performance and emissions. International Journal of Automotive and Mechanical Engineering, 8, 1416-1429.
Zakaria, M. S., Osman, K., & Abdullah, H. (2013). Greenhouse gas reduction by utilization of cold lng boil-off gas. Procedia Engineering, 53, 645-649.
Zakaria, M. S., Osman, K., & Musa, M. (2012). Boil-off gas formation inside large scale liquefied natural gas (lng) tank based on specific parameters. Applied Mechanics and Materials, 229, 690-694.
Zellouf, Y., & Portannier, B. (2011). First step in optimizing lng storages for offshore terminals. Journal of Natural Gas Science and Engineering, 3(5), 582-590.
