Influence of the microchannel plates design on the efficiency of the methanol steam reforming in microreactors

Макаршин, Л. Л.; Andreev, D.V.; Gribovskiy, A.G.; Parmon, Valentin N.

doi:10.1016/j.ijhydene.2007.04.035

Cited by 27 publications

(5 citation statements)

References 14 publications

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“…Multiple modular reactor units could be stacked to provide a reaction system of any desired throughput capacity and portability. Methods have also been suggested for the catalytic reforming of hydrocarbon fuels for the production of hydrogen or synthesis gas by utilizing such a reactor [23,24]. There is a continuing effort to perform steam reforming reactions in microchannel chemical reactors.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Effects of flow velocity and wall properties on the hydrogen production performance of microchannel reactors

Chen

2022

Preprint

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The steam reforming of hydrocarbon or alcohol fuels has attracted increasing interest in the context of the production of hydrogen However, the mechanisms for the effects of design factors on heat transfer characteristics are still not fully understood. This study relates to a thermochemical process for producing hydrogen by the catalytic endothermic reaction of methanol with steam in a thermally integrated microchannel reforming reactor. Computational fluid dynamics simulations are conducted to better understand the consumption, generation, and exchange of thermal energy between endothermic and exothermic processes in the reactor. The effects of flow velocity and wall properties on heat transfer characteristics and reactor performance are investigated. The results indicate that the thermal conductivity of the channel walls is fundamentally important. Materials with high thermal conductivity are preferred for the channel walls. Thermally conductive ceramics and metals are well-suited. Wall materials with poor heat conduction properties degrade the reactor performance. The channel walls of the reactor must be formed using materials with excellent heat conduction properties. To avoid heat loss and increase thermal efficiency, the reactor walls are preferably as thin as possible. The combustion chamber and reforming chamber are preferably oriented so that heat is transferred from the combustion chamber into the reforming chamber. The inclusion of a pleated arrangement of reforming panels provides a more compact reforming system while retaining the desired low pressure drop characteristic of standard panel reformer configuration. The internal pressure within the containment vessel may be used to provide pressure against the exterior surface of the stack, and thereby provide structural support for the stack. The exothermic catalytic combustion reaction provides the necessary heat flux to increase the temperature of the reactants in both channels such that the endothermic reaction will occur. Design recommendations are made to improve hydrogen production performance for the reactor.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Effects of flow velocity and wall properties on the hydrogen production performance of microchannel reactors

Chen

2022

Preprint

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“…5. Improvement of microreactor performance by optimization of fluid flow and heat transfer Makarshin et al (2007) studied the effect of reactor design on the effective reaction rate constant of methanol steam reforming in microreactors with different geometry: rectangular, cylindrical and tubular. The highest reaction rate constant was observed in the rectangular microreactor due to the smallest temperature gradient over the reactor length.…”

Section: Steady-state Multiplicity In Thermally Integrated Microstrucmentioning

confidence: 99%

Single-phase fluid flow distribution and heat transfer in microstructured reactors

Rebrov

Schouten

Croon

2011

Chemical Engineering Science

127

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Single-phase microreactors and micro-heat-exchangers have been widely used in industrial and scientific applications over the last decade. In several cases, operation of microreactors has shown that their expected efficiency cannot be reached either due to non-uniform distribution of reactants between different channels or due to flow maldistribution between individual microreactors working in parallel. The latter problem can result in substantial temperature deviations between different microreactors resulting in thermal runaway which could arise from an exothermic reaction. Thus advances in the understanding of heat transfer and fluid flow distribution continue to be crucial in achieving improved performance, efficiency and safety in microstructured reactors used for different applications. This paper presents a review of the experimental and numerical results on fluid flow distribution, heat transfer and combination thereof, available in the open literature. Heat transfer in microchannels can be suitably described by standard theory and correlations, but scaling effects (entrance effects, conjugate heat transfer, viscous heating, and temperature-dependent properties) have often to be accounted for in microsystems. Experiments with single channels are in good agreement with predictions from the published correlations. The accuracy of multichannel experiments is lower due to flow maldistribution. Special attention is devoted to theoretical and experimental studies on the effect of a flow maldistribution on the thermal and conversion response of catalytic microreactors. The review concludes with a set of design recommendations aimed at improving the reactor performance.

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“…There has been a study of the effects of the microre actor and microchannel plate designs on the apparent rate constant of methanol CSR and on the hydrogen generation capacity of the reactor [36]. Experimental data in that study were analyzed using a simple kinetic model with a first order rate constant (k r ).…”

Section: Microreactors For Hydrogen Generation From Methanolmentioning

confidence: 99%

Microchannel catalytic systems for the intensification of hydrogen production from carbon-containing feedstocks

Макаршин

Parmon

2012

Catal. Ind.

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Influence of the microchannel plates design on the efficiency of the methanol steam reforming in microreactors

Cited by 27 publications

References 14 publications

WITHDRAWN: Effects of flow velocity and wall properties on the hydrogen production performance of microchannel reactors

WITHDRAWN: Effects of flow velocity and wall properties on the hydrogen production performance of microchannel reactors

Single-phase fluid flow distribution and heat transfer in microstructured reactors

Microchannel catalytic systems for the intensification of hydrogen production from carbon-containing feedstocks

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