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Quantitative Risk Assessment of a Liquid Organic Hydrogen Carriers-Based Hydrogen Refueling Station

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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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