284130 Investigation of Hydrogen Gas Safety for the Electrolysis Based Ballast Tank Treatment System

Wednesday, October 31, 2012: 2:30 PM
326 (Convention Center )
Bumjoon Cha1, Hyungtae Cho1, Iksang Yoo2 and Il Moon1, (1)Chemical and Biomolecular Engineering, Yonsei University, Seoul, South Korea, (2)99 Seorin-dong, Jongro-gu, SK Innovation, Seoul, South Korea

Ballast water has been identified as a serious risk to marine environment and a major cause of ecological disturbance due to the pathogens and harmful adventive species discharged through ballast water. The International Maritime Organization (IMO) promulgates the international guidelines containing regulations about technical standards and requirements for ballast water management in order to control adventive species in the discharges. A number of techniques are developed to diminish the aquatic invasive species in ballast water and sedimentations, electrolysis coupled treatment system shows advantages in disinfection efficiency for target species and simple installation and maintenance of system. Simultaneously, the explosion risk of hydrogen gas generated through electrolysis system is issued in terms of safety of the ship. The main aim of this study is to verify dynamic behavior of ballast water and concentrations of hydrogen gas in the ballast tank during ballasting process. Computational fluid dynamic (CFD) simulations were implemented to analyze multiphase behavior of hydrogen gas and ballast water within the ballast tank. Hydrogen gas concentration at vent pipe is also measured to verify CFD simulation model. Consequently, hydrogen gas is released into vent pipe normally at 200 ppm, and ballast water contains 0.3 ppm of hydrogen in average. Based on the analysis, we analyze that hydrogen explosion is highly unlikely in the ballast tank. Finally, a recommendation on operationally feasible ways for sustaining hydrogen safety against potential explosion is suggested.

Figure  SEQ Figure \* ARABIC 1. Hydrogen gas concentration profile

Figure  SEQ Figure \* ARABIC 2. Volume fraction of sea water

References

[1] M. M. Abu-Khader, O. Badran, and M. Attarakih, Ballast water treatment technologies: hydrocyclonic a viable option, Clean technologies and Environmental Policy, 13(2), 403-413 (2010).

[2] E. Tsolaki and E. Diamadopoulos, Technologies for ballast water treatment: a review, Chemical Technology and Biotechnology, 85(1), 19-32 (2009).

[3] V. A. Danilov and Il Moon, Gas management in flow field design using 3D DMFC model under high stoichiometric feed, Korean Journal of Chemical Engineering, 23(5), 753-760 (2006).

[4] E. Kim, K. Lee, J. Kim, Y. Lee, J. Park and I. Moon, Development of Korean hydrogen fueling station codes through risk analysis, International Journal of Hydrogen Energy, 36(20), 13122-13131 (2011).


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