Optimization of a counter-flow microchannel reactor using hydrogen assisted catalytic combustion for steam reforming of methane

Jeon, Seung Won; Yoon, Won Jae; Jeong, Minsu; Kim, Yongchan

doi:10.1016/j.ijhydene.2014.02.012

Cited by 53 publications

(14 citation statements)

References 32 publications

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“…The ultimate objective of most of these projects is to develop a portable, autonomous power-generation system using combustion with improvement in energy density over batteries. There are also several approaches for micro air vehicle (MAV) applications, but the majority of concepts are designed for the production of electrical power [25]. The projects have been grouped into four categories: micro-combustors, heat engines, rockets, and fuel cells.…”

Section: Current Technologies In Micro-power Generationmentioning

confidence: 99%

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Chen

2015

ILCPA

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The miniaturization of electro-mechanical devices, and the resulting need for micro-power generation (milliwatts to watts) with low weight, long life devices, has led to the recent development of the field of micro-scale combustion and power generation. The primary objective of this new field is to leverage the high energy density of fuels, specifically liquid hydrocarbon fuels relative to batteries and all other energy storage devices other than nuclear fission, fusion or decay. Some brief scaling arguments are given in this work, and more detailed efforts are referred. A brief introduction to several of the fabrication techniques is presented in this work. Hydrogen-based and some preliminary specialty fuel micro-fuel cells have been successfully developed, and there is a need to develop reliable reformers (or direct conversion fuel cells) for liquid hydrocarbons so that the fuel cells become competitive with the batteries. In this work, the technological issues related to micro-scale combustion and the development of thermochemical devices for power generation will be discussed. Some of the systems currently being developed will be presented, ongoing critical study issues under investigation, and other potential areas of development discussed. Comments regarding the opportunities and limitations of each of the techniques are also presented where applicable.

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Section: Current Technologies In Micro-power Generationmentioning

confidence: 99%

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Chen

2015

ILCPA

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“…Due to the large energy density of hydrocarbons, micro-combustion may eventually replace expensive and environmentally non-benign lithium batteries in portable electronics devices (Ju and Maruta, 2011). Furthermore, due to the inherently higher heat-transfer coefficients, micro-combustors can be efficient heat sources for endothermic reactions, such as ammonia decomposition (Chiuta et al, 2013) and steam reforming (Jeon et al, 2014), in integrated micro-devices for the production of hydrogen for fuel cell applications. Homogeneous flames are typically quenched when confined in the sub-millimeter range because of thermal and radical quenching at combustor walls.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulation of the Thermal Uniformity in Catalytic Micro-Combustors

Chen¹,

Song²,

Xu³

2017

Frontiers in Heat and Mass Transfer

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The combustion and heat transfer characteristics of hydrogen-air or methane-air mixtures in catalytic micro-combustors were studied numerically to assess the impact of wall thermal properties and key operation parameters on the thermal uniformity. A two-dimensional computational fluid dynamics (CFD) model was developed with detailed hetero-/homogeneous chemistry, heat conduction within the solid wall, surface radiation heat transfer, and external heat losses. Parametric studies were carried out to investigate the effect of wall thermal conductivity, feed composition, and flow rate on the thermal uniformity during highly exothermic catalytic reactions. Comparisons of hydrogen-with methane-air systems were made. Based on these insights, an overall energy balance analysis was performed in terms of enthalpy loss. It was shown that the wall thermal properties strongly affect the thermal uniformity, but little impact on the extinction limit and conversion. The feed composition and flow rate have a significant impact on the operating temperature, but only a moderate effect on the thermal uniformity. Most of the enthalpy released by the exothermic reaction is lost to the surroundings under certain conditions, although this energy exchange becomes less efficient as the flow rate increases. This feature is beneficial for heat-exchanger applications.

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“…The applications of HH microreactors range from catalytic microreactors used for the steam reforming of hydrocarbon fuel in low and high-temperature fuel cells [3,4], to catalytic micro-thrusters in propellant systems [5], and to micro-scale heat engines, wherein a catalytic microcombustor is used for direct chemical-to-thermal energy conversion [6]. In most instances, supported noble metal catalysts are employed because of their very high chemical activity and stability for the catalytic reforming and oxidation of hydrogen and hydrocarbons [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effects of heterogeneous–homogeneous interaction on the homogeneous ignition in hydrogen-fueled catalytic microreactors

Chen

Liu

Gao

et al. 2016

International Journal of Hydrogen Energy

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Optimization of a counter-flow microchannel reactor using hydrogen assisted catalytic combustion for steam reforming of methane

Cited by 53 publications

References 32 publications

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Computational Fluid Dynamics Simulation of the Thermal Uniformity in Catalytic Micro-Combustors

Effects of heterogeneous–homogeneous interaction on the homogeneous ignition in hydrogen-fueled catalytic microreactors

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