Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study on the Safety Improvement by CFD Analysis for Packaged Type Hydrogen Refueling System

CFD 툴을 활용한 패키지형 수소충전시스템의 안전성 향상 연구

  • HWANG, SOON-IL (Future Research Division, Korea Gas Safety Corporation) ;
  • KANG, SEUNG-KYU (Future Research Division, Korea Gas Safety Corporation) ;
  • HUH, YUN-SIL (Future Research Division, Korea Gas Safety Corporation)
  • 황순일 (한국가스안전공사 가스안전연구원) ;
  • 강승규 (한국가스안전공사 가스안전연구원) ;
  • 허윤실 (한국가스안전공사 가스안전연구원)
  • Received : 2019.06.10
  • Accepted : 2019.06.30
  • Published : 2019.06.30
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Abstract

In this study, to ensure the safety of the packaged hydrogen refueling system, the improvement plan was derived by using 3-dimensional CFD program (FLACS). We also confirmed the effectiveness of risk reduction and the suitability of safety standard. By ventilation performance evaluation according to the position of the vent, it demonstrated that the vent should be installed at the ceiling to safely ventilate without stagnation of the leaked gas. In case of ventilation system according to KGS standard, risk situation could be resolved after about 5 minutes in the worst leaked condition. The result showed that jet fire and explosion inside the packaged system could affect the surrounding facilities. This proves that the standard for installing flame detectors, emergency shut down system and protection wall is appropriate.

Keywords

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Fig. 1. Grid generation for module packaged hydrogen refuel-ing system

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Fig. 2. Geometry and boundary conditions for module packaged hydrogen refueling system.

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Fig. 3. Hydrogen concentration distribution versus ventilation time

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Fig. 4. Q9 profiles versus ventilation time

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Fig. 5. Gas dispersion of leaked gas in the module packaged Hydrogen refueling system.

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Fig. 6. Jet-fire and heat flux distribution by leaked hydrogen gas.

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Fig. 7. Overpressure by explosion of module packaged Hydrogen refueling system

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Fig. 8. Explosion results of module packaged Hydrogen refu-eling system.

Table 1. Design specifications for Hydrogen refueling system

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Table 2. Installation specifications of ventilation fan

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Table 3. Grid table of ceiling natural ventilation model

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Table 4. Grid table of side natural ventilation model

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Table 5. IEC Recommended leak sizes9)

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Table 6. Response time of Gas detections13)

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Table 7. Simulation conditions for module packaged Hydrogen refueling system

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Table 8. Effect of radiant heat16)

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Table 9. Impact of explosion overpressure16)

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