Optimal Operation Condition of Pressurized Methanol Fuel Processor for Underwater Environment

Ji, Hyunjin; Choi, Eunyeong; Lee, Jung-Hun

doi:10.7316/khnes.2016.27.5.485

“…The reaction kinetics of the methanol steam reforming process have been widely investigated. The following three processes are known to be the main reactions of the methanol steam reforming reaction [10][11][12][13][14][15][16]. The methanol steam reforming reaction is described by three elementary reactions: methanol steam reforming reaction (SR), methanol decomposition (MD), and water gas shift (WGS) reaction.…”

Section: Reaction Kineticsmentioning

confidence: 99%

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

Song¹,

Kim²,

Yu³

et al. 2021

Advances in Energy Research

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A methanol steam reformer converts methanol and steam into a hydrogen-rich mixture through an endothermic reaction. The methanol reformer is divided into a reaction section and a heat supply section that transfers thermal energy from 200 to 300 °C. This study presents the behavior of the methanol steam reforming reaction using the latent heat of the steam. A numerical analysis was separately conducted for two different regimes assuming constant heat flux conditions. A methanol steam reformer is an annulus structure that has a phase change heat transfer from an outer tube to an inner tube. Different from the steam zone temperature in the tube, the latent heat of steam condensation decreases, and there is a gradual between-wall temperature decrease along the longitudinal direction. Since the latent heat of steam condensation is very sensitive to the requested heat from the reformer, it is necessary to consider a refined design of a methanol reformer to obtain a large enough amount of heat by steam condensation.

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“…The reaction kinetics of the methanol steam reforming process have been widely investigated. The following three processes are known to be the main reactions of the methanol steam reforming reaction [10][11][12][13][14][15][16]. The methanol steam reforming reaction is described by three elementary reactions: methanol steam reforming reaction (SR), methanol decomposition (MD), and water gas shift (WGS) reaction.…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…They also show that the high-pressure operation of the methanol steam reforming reaction produces a high concentration of carbon monoxide. They also pointed out that the concentration of carbon monoxide can be significantly reduced with the increasing SM (Steam to Methanol) ratio [11].…”

Section: Introductionmentioning

confidence: 99%

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

Song

¹

,

Kim

²

,

Yu

³

et al. 2020

Energies

Self Cite

3

0

View full text Add to dashboard Cite

A methanol steam reformer converts methanol and steam into a hydrogen-rich mixture through an endothermic reaction. The methanol reformer is divided into a reaction section and a heat supply section that transfers thermal energy from 200 to 300 °C. This study presents the behavior of the methanol steam reforming reaction using the latent heat of the steam. A numerical analysis was separately conducted for two different regimes assuming constant heat flux conditions. A methanol steam reformer is an annulus structure that has a phase change heat transfer from an outer tube to an inner tube. Different from the steam zone temperature in the tube, the latent heat of steam condensation decreases, and there is a gradual between-wall temperature decrease along the longitudinal direction. Since the latent heat of steam condensation is very sensitive to the requested heat from the reformer, it is necessary to consider a refined design of a methanol reformer to obtain a large enough amount of heat by steam condensation.

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“…According to Ji et al [7], the type 214 underwater weapon equipped with a fuel cell system, stores hydrogen in multiple metal hydride cylinders to supply to fuel cells. Metal hydride has an advantage of high hydrogen storage density per volume, but has limitations in increasing the endurance of the underwater vehicles due to the low deployment flexibility of metal alloy and long-term hydrogen charge.…”

Section: Introductionmentioning

confidence: 99%

Conceptual Design Development of a Fuel-Reforming System for Fuel Cells in Underwater Vehicles

Jung

¹

,

Cha

²

,

Park

³

et al. 2020

Energies

6

0

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An air-independent propulsion system containing fuel cells is applied to improve the operational performance of underwater vehicles in an underwater environment. Fuel-reforming efficiently stores and supplies hydrogen required to operate fuel cells. In this study, the applicability of a fuel-reforming system using various fuels for underwater vehicles was analyzed by calculating the fuel and water consumptions, the amount of CO2 generated as a byproduct, and the amount of water required to dissolve the CO2 using aspen HYSYS (Aspen Technology, Inc., Bedford, MA, USA). In addition, the performance of the fuel-reforming system for methanol, which occupies the smallest volume in the system, was researched by analyzing performance indicators such as methanol conversion rate, hydrogen, yield and selectivity, and reforming efficiency under conditions at which pressure, temperature, steam-to-carbon ratio (SCR), and hydrogen separation efficiency vary. The highest reforming efficiency was 77.7–77.8% at 260 °C and 270 °C. At SCR 1.5, the reforming efficiency was the highest, which is 77.8%, and the CO2 generation amount was the lowest at 1.46 kmol/h. At high separation efficiency, the reforming efficiency increased due to the reduction of reactants, and a rate at which energy is consumed for endothermic reactions also decreased, resulting in a lower CO2 generation amount.

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Optimal Operation Condition of Pressurized Methanol Fuel Processor for Underwater Environment

Cited by 6 publications

References 3 publications

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

Conceptual Design Development of a Fuel-Reforming System for Fuel Cells in Underwater Vehicles

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