Abstract
The demand for hydrogen, a carbon–neutral fuel, is expected to increase in the coming decades. However, the current storage efficiency of gaseous hydrogen is poor. Liquid organic hydrogen carriers (LOHCs), which store hydrogen in liquid form under ambient conditions, show promise for on-site hydrogen refueling stations. Toluene-methylcyclohexane is one of the LOHC, it has advantages cost-effect and environmentally to large-scale hydrogen transportation, but it should be evaluated risk assessment based on the chemicals, because there is inherent harm from the properties like toxicity or flammability. Herein, quantitative risk assessment (QRA) results for worst-case scenarios, individual risk (IR), and societal risk (SR) for a methylcyclohexane-based on-site hydrogen refueling station (MHRS) are compared with those a gaseous hydrogen refueling stations (GHRS). The latter is more likely to have explosion-related accidents, while the former is more likely to have had fire-related accidents. Both show similarly high societal risks. The rupture of the MCH storage tank poses the most significant risk, but installing a dike reduces by 86%, thereby placing it within acceptable limits. Thus, the key risk factors for future on-site hydrogen refueling stations are identified and insights into mitigating them are offered.
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Abbreviations
- AHRS :
-
Ammonia-based hydrogen refueling station
- ALARP :
-
As low as reasonably practicable
- EIHP-2 :
-
European Integrated Hydrogen Project 2
- ERPG :
-
Emergency response planning guide
- ESD :
-
Emergency shutdown
- ETA :
-
Event tree analysis
- F-N :
-
Frequency of events which causes at least N fatalities
- FCEV :
-
Fuel-cell electronic vehicles
- GHRS :
-
Gaseous hydrogen refueling station
- H2 :
-
Hydrogen
- HMB :
-
Heat and mass balance
- HRS :
-
Hydrogen refueling station
- IR :
-
Individual risk
- LOHC :
-
Liquid organic hydrogen carrier
- MCH :
-
Methylcyclohexane
- MHRS :
-
MCH-based hydrogen refueling station
- PFD :
-
Process flow diagram
- PSA :
-
Pressure swing adsorption
- QRA:
-
Quantitative risk assessment
- SNL:
-
Sandia National Laboratory
- SR:
-
Societal risk
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Acknowledgements
This work was supported by the Human Resources Development (No.20214000000280) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy, and the Chung-Ang University Graduate Research Scholarship in 2022. This research was also supported by the H2KOREA funded by the Ministry of Education (2022Hydrogen fuel cell-003, Innovative Human Resources Development Project for Hydrogen Fuel Cells).
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Chae, HJ., Gye, HR., Lee, JS. et al. Quantitative Risk Assessment of a Liquid Organic Hydrogen Carriers-Based Hydrogen Refueling Station. Korean J. Chem. Eng. 41, 1311–1327 (2024). https://doi.org/10.1007/s11814-024-00124-2
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DOI: https://doi.org/10.1007/s11814-024-00124-2