액화수소 벤트 배관의 질소 퍼지에 대한 적정성 연구 = A Study on the Properties of Nitrogen Purging in Liquefied Hydrogen Vent Pipes

다국어 초록 (Multilingual Abstract)

-

다국어 초록 (Multilingual Abstract)

Hydrogen is one of the most popular eco-friendly energy sources for reducing global warming. To use hydrogen as a conventional fuel, liquid hydrogen plants should introduce waste hydrogen treatment processes. A major safety issue of liquid hydrogen plants is choosing the most suitable purge gas to use in case of an accident. A purge gas prevents the formation of explosive mixed gases in the vent header. In general, nitrogen is the main purge gas used in chemical plants. Nitrogen has a freezing point of –210℃, which is higher than the boiling point of hydrogen. Helium, with a freezing point lower than hydrogen, is instead recommended as a purge gas of the vent header during hydrogen liquefaction. However, helium is roughly 100 times more expensive than nitrogen. To address this issue, this study uses simulations to investigate safe conditions for introducing nitrogen as the purge gas during hydrogen liquefaction. The temperature change from the safety valve to the vent header is evaluated when the external temperature of the safety valve discharge pipe is at 5℃, 10℃, and 20℃. Additionally, the most optimal length for a discharge pipe according to pipe diameter is investigated.

참고문헌 (Reference)

• 1 "https://www.gasnews.com/news/articleView.html?idxno=104831"
• 2 "https://namu.wiki/w/%EC%95%A1%EC%B2%B4%ED%97%AC%EB%A5%A8"
• 3 "https://m.yna,co.kr/view/AKR20210728062400052"
• 4 "https://en.wikipedia.org/wiki/Nitrogen"
• 5 "http://www.newstomato.com/ReadNews.aspx?no=1028325"
• 6 Warren L. McCabe, "Unit Operations of Chemical Engineering" McGraw-Hill 292-295, 2005
• 7 성대현 ; 이광원 ; 김태훈 ; 오동석 ; 오영달 ; 서두현 ; 김영규 ; 김은정, "Quantitative Safety Assessment for Hydrogen Station" 27 (27): 111-116, 2012
• 8 "NASA Publication Standard, NSS 1740.16 Safety Standard for Hydrogen and Hydrogen Systems"
• 9 Linde Korea, "MSDS : Nitrogen"
• 10 Linde Korea, "MSDS : Hydrogen"
• 11 Linde Korea, "MSDS : Helium"
• 12 KOSHA, "KOSHA Guide P-80 Technical Guidelines for Inert gas Substitution"
• 13 KOSHA, "KOSHA Guide D-59 Technical Guidelines for Design, Installation and Operation of Flare System"
• 14 KOSHA, "KOSHA Guide D-42 Technical Guidelines for Process Design of Hydrogen Stacks and Vent Piping"
• 15 J. H. Baik, "Hydrogen Liquefaction and Cyrogenic Storage Technology" 53 (53): 38-43, 2013
• 16 Hans Dieter Baehr, "Heat and Mass-transfer" Springer 31-, 2006
• 17 이동열 ; 이의주, "Characteristics of Chemical Reaction and Ignition Delay in Hydrogen/Air/Diluent Mixtures" 36 (36): 1-6, 2021
• 18 Y. D. Jo, "A Study on Safety of Hydrogen" 8 (8): 37-41, 2012
• 19 전대천, "A Study on Safety Policies for a Transition to a Hydrogen Economy" 25 (25): 161-172, 2014
• 20 조영도, "A Study on Physicochemical Characteristics of Hydrogen Gas Explosion" 16 (16): 8-14, 2012
• 21 윤일구 ; 고태국 ; 박동근 ; 안민철 ; 양성은 ; 김영재, "A Study on Liquefied Hydrogen from NASA and DOE" 7 (7): 28-33, 2005