Modeling process intensified catalytic plate reactor for synthesis gas production

Lakhete, Prashil; Janardhanan, Vinod M.

doi:10.1016/j.ces.2013.05.021

Cited by 19 publications

(5 citation statements)

References 15 publications

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“…The plate temperature peaks near the inlet of the oxidation channel, since the feed gas of POX reacts instantly the temperature in the oxidation channel shoots up very close to the inlet. Although, generally co-current configuration can mitigate hot spot formation [70], according to literatures [68,71] figures 7 and 8 for the reforming and partial oxidation channels, respectively show that for the same conditions, counter-current configuration results in higher conversion compared to co-current arrangement in figures 4 and 5. In comparison methane conversion results from reforming channels which show in figures 7 and 4, a substantial growth in counter-current, approximately 5 times can be found out.…”

Section: Effect Of Flow Arrangementmentioning

confidence: 80%

Simulation a Couple of Exothermic and Endothermic Syngas Processes in a Catalytic Plate Reactor

Safari¹,

Towfighi²,

Torkian³

2022

WCEJ untirta

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This paper studies an efficient way to produce syngas from the methane couple reforming and partial methane oxidation by utilizing a catalytic plate reactor. Methane steam and dry reforming as endothermic reactions are coupled with partial methane oxidation as an exothermic reaction in a catalytic plate reactor, which is simulated using detailed reaction kinetics, mass, and energy balances. The impact of inlet temperature, composition, and velocities on the reforming and partial oxidation channels, and also the resulting methane conversions, is studied. In addition, the H2/CO ratio is evaluated for both endothermic and exothermic sides across varied feed ratios. Co-and counterflow arrangements are simulated for catalytic plate reactors, and their impact on temperature distribution and methane conversion is studied. The suitable plate dimensions, in particular, plate length, are computed during this simulation. Applying a metal plate, Co-and counter-flow arrangements are simulated for catalytic plate reactors, and their impact on temperature distribution and methane conversion is studied. During this simulation, the appropriate plate dimensions, particularly plate length, are determined. The use of a metal plate with a greater thermal conductivity allows for effective heat transmission between endothermic and exothermic channels, resulting in outstanding temperature distribution and slight temperature differences.

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Section: Effect Of Flow Arrangementmentioning

confidence: 80%

Simulation a Couple of Exothermic and Endothermic Syngas Processes in a Catalytic Plate Reactor

Safari¹,

Towfighi²,

Torkian³

2022

WCEJ untirta

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“…104 In cocurrent flow, the temperature is the highest near the channel inlet of the methane combustor, and the kinetics of reforming is also very fast. Due to early conversion in channels 46 and overlapping of reaction zones in cocurrent mode, the heat generated by MC is subsequently used by the endothermic steam reforming reaction on the alternate side of the middle plate. Overlap of reaction zones helps to reduce hot spots and temperature spikes.…”

Section: Methane Steam Reformingmentioning

confidence: 99%

“…The design of CPR permits higher heat transfer rates due to the short conduction length of the thin plate and also higher mass transfer rates because of the short diffusion path in the thin catalyst layer, thus making it efficient and compact . Several modeling studies − were performed to design and optimize the CPR that combines the MSR and MC reactions for various applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental Insights into the Coupling of Methane Combustion and Steam Reforming in a Catalytic Plate Reactor in Transient Mode

Ashraf

Tacchino

Peela

et al. 2020

Ind. Eng. Chem. Res.

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The microstructured reactor concept is very promising technology to develop a compact reformer for distributed hydrogen generation. In this work, a catalytic plate reactor (CPR) is developed and investigated for the coupling of methane combustion (MC) and methane steam reforming (MSR) over Pt/Al2O3-coated microchannels in cocurrent and counter-current modes in transient experiments during start-up. A three-dimensional (3D) computational fluid dynamics (CFD) simulation shows uniform velocity and pressure distribution profiles in microchannels. For a channel velocity from 5.1 to 57.3 m/s in the combustor, the oxidation of methane is complete and self-sustainable without explosion, blow-off, or extinction; nevertheless, flashbacks are observed in counter-current mode. In the reformer, the maximum methane conversion is 84.9% in cocurrent mode, slightly higher than that of 80.2% in counter-current mode at a residence time of 33 ms, but at the cost of three times higher energy input in the combustor operating at ∼1000 °C. Nitric oxide (NO) is not identified in combustion products, but nitrous oxide (N2O) is a function of coupling mode and forms significantly in cocurrent mode. This research would be helpful to establish the start-up strategy and environmental impact of compact reformers on a small scale.

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“…The channel number varies significantly with application, but the linear scale-out approximation ignores the influence of exterior heat loss. Linear scale-out models assume that all of the channels behave similarly without taking into account the effects due to exterior heat loss. , However, the reaction is quenched if loss of too much heat occurs, , and thus, the issue of extinction could not be addressed with the linear scale-out assumption. The heat loss coefficient is inversely proportional to the characteristic length scale, and thus large heat loss coefficients are inherent to microchannel reactors. , Accordingly, the total heat loss may be increased significantly, , which will cause the reaction to extinguish. , The critical heat loss coefficient is an effective means of assessing the importance of stack structure and heat loss in microreactor design, thus making it possible to obtain the optimum reaction conditions by controlling the complex physicochemical processes.…”

Section: Introductionmentioning

confidence: 99%

“…Linear scale-out models assume that all of the channels behave similarly without taking into account the effects due to exterior heat loss. 33,34 However, the reaction is quenched if loss of too much heat occurs, 35,36 and thus, the issue of extinction could not be addressed with the linear scaleout assumption. The heat loss coefficient is inversely proportional to the characteristic length scale, and thus large heat loss coefficients are inherent to microchannel reactors.…”

Section: Introductionmentioning

confidence: 99%

Effects of Stack Structure and Heat Loss on the Stability and Efficiency of Steam-Methanol Reforming Microreactors for Hydrogen Production

Chen

Miao

2023

Ind. Eng. Chem. Res.

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The linear scale-out approximation ignores the influence of exterior heat loss and thus cannot address extinction issues. The present study is focused primarily upon the roles of stack structure and heat loss in the stability and efficiency of microreactors for hydrogen production by steam-methanol reforming. Computer simulations are performed to model the complex physicochemical processes in a variety of different heat loss situations. The effects of channel number, wall thermal conductivity, and surface-area-to-volume ratio are investigated to assess the importance of stack structure and heat loss in microreactor design. The results indicate that the total heat loss becomes increasingly significant for designing reactors with small stacks of channels. About half of heat released is lost if a global-type extinction occurs. The critical heat loss coefficient depends heavily upon the number of channels. The design with a large stack of channels more closely beneficially improves heat utilization and reduces heat loss. There is a significant linear relationship between energy efficiency and heat loss coefficient. Significant heat loss may cause extinction in edge channels while still permitting very high conversion in center channels. The wall thermal conductivity is of vital importance to ensure stability operation. Higher wall thermal conductivity provides stability benefits, but walls with very low thermal conductivity can be employed to reduce heat loss by sacrificing the thermal coupling capability.

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Modeling process intensified catalytic plate reactor for synthesis gas production

Cited by 19 publications

References 15 publications

Simulation a Couple of Exothermic and Endothermic Syngas Processes in a Catalytic Plate Reactor

Simulation a Couple of Exothermic and Endothermic Syngas Processes in a Catalytic Plate Reactor

Experimental Insights into the Coupling of Methane Combustion and Steam Reforming in a Catalytic Plate Reactor in Transient Mode

Effects of Stack Structure and Heat Loss on the Stability and Efficiency of Steam-Methanol Reforming Microreactors for Hydrogen Production

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