CFD Simulation of Microchannel Reactor Block for Fischer–Tropsch Synthesis: Effect of Coolant Type and Wall Boiling Condition on Reactor Temperature

Kshetrimayum, Krishnadash S.; Jung, Inhwa; Na, Jonggeol; Park, Seong-Ho; Lee, Yong-Kyu; Park, Seongeon; Lee, Chul Jin; Han, Chonghun

doi:10.1021/acs.iecr.5b03283

Cited by 23 publications

(4 citation statements)

References 32 publications

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“…Detailed modeling is necessary to understand the interaction between kinetics and transport in reactor performance because of the small scale of the microchannel reactors involved [43][44][45][46]. The system presented in this paper is methane steam reforming coupled with catalytic combustion in thermally integrated microchannel reactors for the production of hydrogen.…”

Section: Description Of the Reaction Systemmentioning

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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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: Description Of the Reaction Systemmentioning

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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“…Higher conversion levels can be applied in the process without harming the catalyst. Furthermore, concentration and temperature changes may be quickly applied because of short overall distances and advanced tools like evaporation cooling [61,[63][64][65]. This allows high-pressure steam production from the FTS reaction in order to enhance the thermal efficiency of a process network while enabling the control over the FTS reactor at the same time.…”

Section: Microstructured Reactor Technologymentioning

confidence: 99%

Dynamically Operated Fischer-Tropsch Synthesis in PtL-Part 1: System Response on Intermittent Feed

Loewert

Pfeifer

2020

ChemEngineering

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Society is facing serious challenges to reduce CO2 emissions. Effective change requires the use of advanced chemical catalyst and reactor systems to utilize renewable feedstocks. One pathway to long-term energy storage is its transformation into high quality, low-emission and CO2-neutral fuels. Performance of technologies such as the Fischer-Tropsch reaction can be maximized using the inherent advantages of microstructured packed bed reactors. Advantages arise not only from high conversion and productivity, but from its capability to resolve the natural fluctuation of renewable sources. This work highlights and evaluates a system for dynamic feed gas and temperature changes in a pilot scale Fischer-Tropsch synthesis unit for up to 7 L of product per day. Dead times were determined for non-reactive and reactive mode at individual positions in the setup. Oscillating conditions were applied to investigate responses with regard to gaseous and liquid products. The system was stable at short cycle times of 8 min. Neither of the periodic changes showed negative effects on the process performance. Findings even suggest this technology’s capability for effective, small-to-medium-scale applications with periodically changing process parameters. The second part of this work focuses on the application of a real-time photovoltaics profile to the given system.

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“…Shin et al's work was further expanded for determining the optimal structure of a modular multichannel reaction module [16]. The CFD simulation of heat transfer in a microchannel reactor block for low-temperature FTS (LTFT) was used to modify the reactor block with improved thermal performance and heat transfer enhancements attributed to wall boiling conditions [17]. Recent studies for innovative con gurations such as monolithic loop and membrane reactors as well as microchannel reactors for improving the performance of LTFT synthesis have been reported [18].…”

Section: Introductionmentioning

confidence: 99%

CFD Modeling of a Multichannel Fischer–Tropsch Reactor Module with Microscale Cooling Channels: Effects of Mirrored Structure Cooling Layers

Woo

Park

et al. 2023

Preprint

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Computational fluid dynamics (CFD) modeling of a multichannel Fischer–Tropsch reactor with microscale cooling channels was addressed in this study, wherein detailed mass, momentum, and energy balances were solved to retrieve detailed distributions of the conversion and temperature of both catalytic and cooling layers. A comparison between experimental data and simulation results showed relative errors of 6.73% and 1.22% for conversion and C5 + selectivity, respectively, which proves the validity of the proposed model. The novel structure of the reactor composed of mirrored structure cooling layers was suggested to prevent the thermal instability of a large-scale reactor module. The simulation showed that the symmetric distribution of the dense cooling channel area in the early part of the reactor decreased peak temperatures (ΔTmax = 28.6°C), whereas the nonmirrored case resulted in hot spots caused by the limited heat transfer capacity (ΔTmax = 39.2°C). The effects of the feed/coolant temperature, space velocity, and pressure were evaluated, and high temperatures and pressures resulted in a steep temperature increase in the early part of the reactor whereas the high space velocity showed an increase in the area of peak temperature. Further, the analysis showed trade-offs of operating conditions between the conversion and selectivity of desired products.

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CFD Simulation of Microchannel Reactor Block for Fischer–Tropsch Synthesis: Effect of Coolant Type and Wall Boiling Condition on Reactor Temperature

Cited by 23 publications

References 32 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

Dynamically Operated Fischer-Tropsch Synthesis in PtL-Part 1: System Response on Intermittent Feed

CFD Modeling of a Multichannel Fischer–Tropsch Reactor Module with Microscale Cooling Channels: Effects of Mirrored Structure Cooling Layers

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