A Three Dimensional Dynamic CFD Simulation for the Direct DME Production in a Fixed Bed Reactor

2013 ◽  
pp. 247-252 ◽  
Author(s):  
Fazel Moradi ◽  
Mohammad Kazemeini ◽  
Leila Vafajoo ◽  
Moslem Fattahi
Keyword(s):  
Cfd Simulation ◽  
Fixed Bed ◽  
Three Dimensional ◽  
Fixed Bed Reactor

CFD Simulation of a Methane Steam Reforming Reactor

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Mohammad Taghi Sadeghi ◽  
Mazaher Molaei
Keyword(s):  
Skin Temperature ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Cfd Simulation ◽  
Fixed Bed ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Fixed Bed Reactor ◽  
Methane Steam Reforming ◽  
Tehran Refinery

An industrial steam reforming reactor producing hydrogen is simulated using the three-dimensional Computational Fluid Dynamics (CFD) technique. The fixed bed reactor is filled with a nickel oxide catalyst. Effects of operating conditions such as temperature and steam to methane ratio on the reformer performance are investigated. Simulation results show that a steam to carbon ratio of more than 4 increases in the ratio does not have a notable influence on methane yield. Moreover, it shows that methane conversion is strongly affected by reactor skin temperature and higher skin temperature leads to an increase in the methane conversion. The results were successfully validated with industrial data obtained from a hydrogen plant at a Tehran refinery.

Heat Transfer inside Elliptic Cylindrical Reactor: Effect of Bed Porosity

2013 ◽  
Vol 336 ◽  
pp. 97-102
Author(s):  
A.A. Silva Filho ◽  
J.P. Silva de Almeida ◽  
Antônio Gilson Barbosa de Lima
Keyword(s):  
Heat Transfer ◽  
Fixed Bed ◽  
Three Dimensional ◽  
Axial Direction ◽  
Cylindrical Geometry ◽  
Heat Diffusion ◽  
Fixed Bed Reactor ◽  
Three Dimensional Model ◽  
Variable Porosity ◽  
Steady State Heat Transfer

The study of heat transfer phenomenon in porous media by fluids percolated in the axial direction has been of interest to many researchers in various branches of science and technology. Applications are directed to different process such as filtration, distillation, absorption and adsorption in columns, drying and catalytic reactions in fixed beds. The literature has presented several solutions of the heat diffusion / convection equation in fixed bed reactors, but these studies are limited to a cylindrical geometry. In this sense, this work aim to present a pseudo-homogeneous three-dimensional model to describe the steady-state heat transfer within a fixed bed reactor with elliptic cylindrical geometry by considering variable porosity. The energy equation written in elliptical cylindrical coordinates and applied to the porous medium (particulate system) is discretized numerically using the finite volume method. Results of the temperature distribution within the bed are presented analyzed. It was verified that with increased porosity heat transfer inside the reactor tends to be more intense and thus, lower temperature gradients are found in all cross section of the reactor.

scholarly journals CFD simulation of methanation reaction over 3D-printed monolithic catalysts: A comparative study

2021 ◽  
Author(s):  
Mingzheng Zhang ◽  
Michelle Ng Xin Yi ◽  
Ban Zhen Hong ◽  
Liming Che ◽  
Bing Hui Chen
Keyword(s):  
Heat Transfer ◽  
Cfd Simulation ◽  
Hot Spot ◽  
Fixed Bed ◽  
Channel Structure ◽  
Fixed Bed Reactor ◽  
Monolithic Catalyst ◽  
Methanation Reaction ◽  
Monolithic Catalysts ◽  
3D Printed

Exothermic methanation reaction from syngas to synthetic natural gas (SNG) in fixed-bed reactor suffers from hot-spot formation caused by limited heat transfer area and relatively poor radial heat transfer of catalyst particle packings. To address this issue, monolithic catalyst with excellent transport and mechanical properties is under development. In this contribution, CFD simulations of methanation reaction from syngas to SNG over three types of 3D-printed monolithic catalysts were performed. The simulation results are in good agreement with experimental ones. Compared with monolithic catalyst with honeycomb-shaped straight-channel structure or tetrahedral periodic structure, bio-inspired monolithic catalyst having the same characteristic of cancellous bone was found to be promising due to its lower pressure drop, better heat transfer, superior mass transfer and thus higher conversion of syngas. The mechanism and promising applications of 3D-printing bio-inspired monolithic catalyst are discussed.

scholarly journals CFD Simulation of Catalytic Cracking of n-Heptane in a Fixed Bed Reactor

2020 ◽  
Vol 4 (2) ◽  
pp. 1-8
Author(s):  
Hosseini SA
Keyword(s):  
Catalytic Cracking ◽  
Cfd Simulation ◽  
Fixed Bed ◽  
Particle Diameter ◽  
Reaction Scheme ◽  
Fixed Bed Reactor ◽  
Coke Deposition ◽  
Three Dimension ◽  
Secondary Reactions ◽  
Cracking Process

This work aims to three-dimension computational fluid dynamics (CFD) simulation of n-heptane catalytic cracking in fixed bed reactor (L=0.80 m) and to promote the cracking model of n-heptane using CFD. The catalyst granules were located in middle section of the reactor. The reaction scheme of n-heptane catalytic cracking was involved one primary reaction and 24 secondary reactions. Catalytic cracking process with a model of 25 molecular reactions was simulated by Fluent 6.0 software. The ratio of tube-to-particle diameter was considered N=2. The contours of coke deposition rate, vorticity, velocity and coke precursors and their relations along the reactor were predicted and discussed.

CFD simulation of the ethylbenzene dehydrogenation reaction in the fixed bed reactor with a cylindrical catalyst of various sizes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sergei A. Solovev ◽  
Olga V. Soloveva ◽  
Daniel L. Paluku ◽  
Alexander A. Lamberov
Keyword(s):  
Size Effect ◽  
Cfd Simulation ◽  
Fixed Bed ◽  
Total Surface Area ◽  
Fixed Bed Reactor ◽  
Pressure Drops ◽  
Dehydrogenation Reaction ◽  
Ethylbenzene Dehydrogenation ◽  
Detailed Evaluation ◽  
Porosity Effect

Abstract In this paper, the Discrete Element Method of simulation was used to study the catalytic granule size effect on the efficiency of a bed reactor for the ethylbenzene dehydrogenation reaction. The model constructed for the laboratory experiment was made of catalyst granules of lengths 3, 6 and 9 mm, and diameters 2.8, 3, and 3.2 mm. A detailed evaluation of the catalyst total surface area and porosity effect was conducted owing to the analysis of particles size effect on the packing. Different results were observed for a wide feed gas mixture rate. Calculations performed allowed to deduce dependences of the reaction product concentration, the pressure drops, and the reactor productivity for all the particle sizes investigated.

Sign in / Sign up

Export Citation Format

Share Document