Efficient integration of alkaline water electrolyzer – A model predictive control approach for a sustainable low-carbon district heating system

Khaligh, Vahid; Ghezelbash, Azam; Zarei, Mohammadamin; Liu, Jay; Maravelias, Christos T.

doi:10.1016/j.enconman.2023.117404

Cited by 9 publications

(1 citation statement)

References 35 publications

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“…9 Hydrogen is a promising candidate as an energy carrier because of its cleanliness, abundance, and high gravimetric energy density (120 MJ/kg) compared to other energy sources. 10,11 However, there are still considerations, such as its low volumetric energy density (10.9 kJ/L) and gaseous state at room conditions, for the transition to a hydrogen economy. 12 These drawbacks make hydrogen transport difficult.…”

Section: ■ Introductionmentioning

confidence: 99%

A System-Level Analysis for Long-Distance Hydrogen Transport Using Liquid Organic Hydrogen Carriers (LOHCs): A Case Study in Australia–Korea

Ahn,

Sohn,

Liu

et al. 2024

ACS Sustainable Chem. Eng.

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The toluene (TOL)–methylcyclohexane (MCH) system is one of the viable solutions because of its high stability and high hydrogen storage capacity (6.2%). However, the high volatilities of TOL and MCH and the accumulative byproducts make it difficult to transport hydrogen. Considering these limitations, we developed a new strategy introducing an extraction column and pressure swing adsorption with heat integration to reduce the required energy utilities. Furthermore, a comprehensive system-level analysis was conducted through an application example of the transport of hydrogen from Australia to Korea. The minimum transport cost of hydrogen was determined to be $2.17/kg-H2 via techno-economic analysis. Sensitivity and uncertainty analyses revealed the influence of the economic and process parameters. Finally, a life cycle assessment was conducted to compare the environmental impact (EI) of each part. Although dehydrogenation is more energy-demanding than hydrogenation, hydrogenation has larger EIs for some factors including fossil resource scarcity (13% larger) and water consumption (746% larger), due to the toluene and hydrogen makeup. Furthermore, we compared changes in the EIs in the energy sources. This study can provide insights into the optimization and decision-making of hydrogen supply chains to revitalize the hydrogen economy.

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