Performance Research on a Methane Compact Reformer Integrated with Catalytic Combustion

Irankhah, Abdullah; Rahimi, Mohsen; Rezaei, Mehran

doi:10.1002/ceat.201300469

Cited by 16 publications

(9 citation statements)

References 29 publications

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“…Consequently, there is considerable interest in the "on-board" conversion of methane to hydrogen at short contact times [1,2]. The rapid production of hydrogen from methane steam reforming with contact times of less than 10 milliseconds have been reported, including in microchannel or microstructured reactors [11][12][13][14][21][22][23][24] and on highly active catalysts such as rhodium [25]. Careful design is necessary to further reduce the contact time, as the process has been designed to operate at sub-millisecond contact times [13], even at less than 100 microseconds at the expense of low equilibrium conversion [11].…”

Section: Introductionmentioning

confidence: 99%

“…To achieve millisecond reforming processes, microchannel reactors have great potentiality in this field [11,21,23,26,27]. The microreaction technology offers process intensification by using microchannel reactors in the form of enhanced transport characteristics [23,24,27,28]. This technology has the potential to reduce reaction times significantly.…”

Section: Introductionmentioning

confidence: 99%

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RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

et al. 2018

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This paper addresses the issues related to the rapid production of hydrogen from methane steam reforming by means of process intensification. Methane steam reforming coupled with catalytic combustion in thermally integrated microchannel reactors for the production of hydrogen was investigated numerically. The effect of the catalyst, flow arrangement, and reactor dimension was assessed to optimize the design of the system. The thermal interaction between reforming and combustion was investigated for the purpose of the rapid production of hydrogen. The importance of thermal management was discussed in detail, and a theoretical analysis was made on the transport phenomena during each of the reforming and combustion processes. The results indicated that the design of a thermally integrated system operated at millisecond contact times is feasible. The design benefits from the miniaturization of the reactors, but the improvement in catalyst performance is also required to ensure the rapid production of hydrogen, especially for the reforming process. The efficiency of heat exchange can be greatly improved by decreasing the gap distance. The flow rates should be well designed on both sides of the reactor to meet the requirements of both materials and combustion stability. The flow arrangement plays a vital role in the operation of the thermally integrated reactor, and the design in a parallel-flow heat exchanger is preferred to optimize the distribution of energy in the system. The catalyst loading is an important design parameter to optimize reactor performance and must be carefully designed. Finally, engineering maps were constructed to design thermally integrated devices with desired power, and operating windows were also determined.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

et al. 2018

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“…In this study, a pre‐prepared industrial catalyst was used straightforwardly and easily to coat a uniform layer onto stainless steel substrate. As Nickel catalyst is used widely in steam reforming either in literature or industries then we used Ni/CaAl2O4 catalyst 47 . Physical and chemical specifications of the catalyst are given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Electrophoretic coating for steam methane micro‐reformer: Optimum voltage and time, channel design, and substrate type

Mohammadnezami

Irankhah

2021

Int J Energy Res

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Summary Following our previous simulation study, in this study manufacturing of previously simulated micro‐reformer was carried out in order to study intensifying steam methane reforming. SUS 310 was selected as the base material and a copper gasket was used for sealing. Because of simplicity and being straightforward, the electrophoretic deposition method was used for the first time to coat a commercial Nickel‐based reforming catalyst onto reaction plates. All reaction plates had the dimensions of 21 × 20 mm and at most 3 mm depth. S310 was used for anode and S304 for cathode. Reduction of catalyst was performed at 650°C. Five cm quartz packing was used to preheat feed before entering the micro‐reformer. In the first part, after investigating important variables of voltage and coating time in the range of 1 to 4 minutes and 100 to 140 V, optimum conditions were found to be 120 V and 1.5 minute, respectively, which gave 5.1 mg/cm2 surface density. At optimum condition, micro‐reformer had better performance than packed‐bed reactor even at low weight hourly space velocities. In the second part of the study, three channel designs, that is, parallel, splitting‐jointing, and pin‐hole were designed, manufactured, and mounted into the micro‐reformer. Based on specific methane conversion, splitting‐jointing had marginally better performance than parallel channels. This finding was contrary to the simulation results. This difference originates from two reasons: (a) monolayer assumption in the simulation was not real because of inherent porosity in the EPD coated layer; (b) a gap of 0.2 mm between the micro‐reformer casing and the reaction plate would appear if temperature exceeded 650°C and this gap caused flow by pass‐through channels. At the third and final part, copper substrate was coated and compared with S310 substrate. Results did not show so much better methane conversion because dimension were very small, which means temperature along the depth or length did not vary considerably. Stability analysis, reducing the channel sizes, redesigning the micro‐reformer to add endothermic reaction (such as methane catalytic combustion) section will be our next studies.

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“…To initiate CPR heating at room temperature, hydrogen is a promising candidate that can be ignited over Pt catalyst but results in a nonuniform temperature profile and poses an explosion risk . On the other hand, part of the methane reforming feed can be used in a combustor but requires a high temperature to initiate the oxidation reaction . In the present study, an electric furnace is used for heating the reactor to the desired reaction temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Venkataraman et al 31 reported self-sustained steady state operation of two-pass CPR in cocurrent mode at 800−1000 °C with methane conversion of 95% on the reforming side and >90% on the combustion side. In another study, Irankhah et al 66 investigated the performance of methane compact reformer integrated with catalytic methane combustor under various operating conditions. As per the author's knowledge, there is a lack of experimental study on the thermal coupling of methane combustor and methane steam reformer in CPR in transient mode during start-up.…”

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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Performance Research on a Methane Compact Reformer Integrated with Catalytic Combustion

Cited by 16 publications

References 29 publications

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

Electrophoretic coating for steam methane micro‐reformer: Optimum voltage and time, channel design, and substrate type

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

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