Numerical study of steam methane reforming over a pre-heated Ni-based catalyst with detailed fluid dynamics

Pashchenko, Dmitry

doi:10.1016/j.fuel.2018.09.033

Cited by 57 publications

(7 citation statements)

References 43 publications

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“…For the stoichiometric methane to steam ratio, the conversion decreased with the temperature, with the increasing of time on stream. In another study, Pashchenko presented a computational fluid dynamics model of the methane steam reforming over pre-heated Ni-based catalyst, developed via ANSYS Fluent, for real computational domain of the reformer [66]. The results showed that each 100 mm of catalyst bed, the pressure drop was about 160 Pa, no significant gradient was present along the radial axis of the reformer, at the catalyst temperature of 1300 K the syngas composition approached to equilibrium.…”

Section: Kinetics and Simulationsmentioning

confidence: 99%

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

2020

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Hydrogen is an important raw material in chemical industries, and the steam reforming of light hydrocarbons (such as methane) is the most used process for its production. In this process, the use of a catalyst is mandatory and, if compared to precious metal-based catalysts, Ni-based catalysts assure an acceptable high activity and a lower cost. The aim of a distributed hydrogen production, for example, through an on-site type hydrogen station, is only reachable if a novel reforming system is developed, with some unique properties that are not present in the large-scale reforming system. These properties include, among the others, (i) daily startup and shutdown (DSS) operation ability, (ii) rapid response to load fluctuation, (iii) compactness of device, and (iv) excellent thermal exchange. In this sense, the catalyst has an important role. There is vast amount of information in the literature regarding the performance of catalysts in methane steam reforming. In this short review, an overview on the most recent advances in Ni based catalysts for methane steam reforming is given, also regarding the use of innovative structured catalysts.

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Section: Kinetics and Simulationsmentioning

confidence: 99%

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

2020

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“…Methane is considered to be a practical raw material for hydrogen production due to its high hydrogen molar fraction and great abundance, with a yearly global production of 1 189 000 Nm 3 16 . Thus, various techniques have been developed for this purpose for example, steam methane reforming (SMR), dry methane reforming (DR), and partial oxidation (POX) 17‐26 . SMR reaction is the commonly used method for the efficient and simple production of hydrogen 27‐29 .…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern

2021

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Summary Herein, a 2D numerical analysis is conducted to study the steam methane reforming reaction (SMR), which is the dominant method for hydrogen production, over a packed bed reactor embedded with a Ni/Al2O3 catalyst. Aiming to achieve higher methane conversion and low catalyst weight, a comparative study on an SMR reactor consisting of a 1‐m long, 0.04‐m diameter cylinder, is examined under three distinct operative configurations to explore new routes for process intensification. In the first configuration, the SMR reactor is filled with the catalyst in accordance with the conventional approach. In case 2, a novel design is proposed where the reactor is partially filled with annular catalyst bed patterns while in the last case, the length of the reactor is extended by 35.4% to obtain the same catalyst weight as in case 1 while adopting the annular catalyst patterns concept. The advantages of implementing the catalyst patterns concept over the conventional reactor are illustrated and justified. The results indicate that the partially filled reactor improves the methane conversion by 10.6% by reducing the catalyst weight by 26.16% compared to the conventional reactor. This latter leads to a lower overall cost of the reactor. Extending the reactor increases the methane conversion by around 23% compared to the conventional reactor; however, this affects the reactor compactness.

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“…A quadratic dependence of the pressure loss on velocity was observed in the experiments. Pashchenko 16 performed a numerical study of SMR with a pre‐heated Ni‐based catalyst. A 2D CFD model was developed in ANSYS Fluent to predict the reaction and transport phenomena in the reaction space of the reformer.…”

Section: Introductionmentioning

confidence: 99%

“…Pashchenko 16 also conducted studies that delineate the effect of calculated computational geometry on the CFD results of the SMR process. Furthermore, Pashchenko 17 explored the influence of geometric dimensionality of the computational domain by conducting numerical simulations with 2D planar, 2D axisymmetric, and 3D meshes.…”

Section: Introductionmentioning

confidence: 99%

Numerical parametric study on the burner arrangement design for hydrogen production in a steam methane reformer

2021

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Summary A numerical parametric study on the burner arrangement design for a steam methane reforming reactor was conducted under three burner configurations: a single co‐axial inside burner (SCIB), a single top burner (STB), and multiple top burners (MTB). The burner combustion gas inlet angle was changed to 25°, 45°, and 90° with respect to the horizontal plane. Moreover, the number of reformer tubes inside the reactor was changed to four, six, and eight tubes arrangements. Furthermore, the models were numerically evaluated for temperature distribution inside the combustion space and hydrogen mole fraction in the reactor by incorporating the Xu and Forment model using a user‐defined function (UDF). The results show that the STB configuration is preferable over the SCIB and MTB configuration due to the uniform temperature distribution inside the combustion space and efficient heating from the combustion gas. Furthermore, the standard deviation of the temperature inside the combustion space was found to be lower for the STB arrangement. Moreover, the STB configuration reported a maximum temperature uniformity index of 0.92 for the eight‐tubes reformer arrangement. The value of the average wall heat transfer coefficient and wall heat flux at the reformer tube surface for STB configuration was 396.6 W/(m2K) and 21.7 W/m2, respectively. The velocity inlet angle of the burner combustion gas also plays an important role in the methane steam reforming reaction. A burner combustion gas inlet angle of 45° was observed to have better hydrogen conversion than the 25° and 90° inlet angles due to the proper mixing, leading to more effective heat transfer to the reformer tubes.

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Numerical study of steam methane reforming over a pre-heated Ni-based catalyst with detailed fluid dynamics

Cited by 57 publications

References 43 publications

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern

Numerical parametric study on the burner arrangement design for hydrogen production in a steam methane reformer

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Numerical study of steam methane reforming over a pre-heated Ni-based catalyst with detailed fluid dynamics

Cited by 57 publications

References 43 publications

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al 2 O 3 catalyst pattern

Numerical parametric study on the burner arrangement design for hydrogen production in a steam methane reformer

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Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern