A Coupled DEM and CFD Simulation of Flow Field and Pressure Drop in Fixed Bed Reactor with Randomly Packed Catalyst Particles

2009 ◽  
Vol 48 (8) ◽  
pp. 4060-4074 ◽  
Author(s):  
Hua Bai ◽  
Jörg Theuerkauf ◽  
Paul A. Gillis ◽  
Paul M. Witt
Keyword(s):  
Pressure Drop ◽  
Flow Field ◽  
Cfd Simulation ◽  
Fixed Bed ◽  
Fixed Bed Reactor

CFD Simulation of Two-Phase Flow in a Downhole Venturi Meter

2011 ◽  
Vol 130-134 ◽  
pp. 3644-3647
Author(s):  
Ding Feng ◽  
Si Huang ◽  
Yu Hui Guan ◽  
Wei Guo Ma
Keyword(s):  
Optimal Design ◽  
Pressure Drop ◽  
Flow Field ◽  
Cfd Simulation ◽  
Two Phase Flow ◽  
Flow Simulation ◽  
Phase Flow ◽  
Feed Flow Rate ◽  
Two Phase ◽  
Oil Water

This work performs an oil-water two-phase flow simulation in a downhole Venturi meter to investigate the flow field and pressure characteristics with different flow and oil-water ratios. The relation between the pressure drop and the feed flow rate in the flowmeter is investigated for its optimal design.

Pressure drop across a fixed bed reactor with mechanical failure of catalyst pellets described by simplified ergun's equation

2005 ◽  
Vol 3 (1-2) ◽  
pp. 23-25 ◽  
Author(s):  
Dong Zhang ◽  
Panfeng Fan ◽  
Dongfang Wu ◽  
Yongdan Li
Keyword(s):  
Pressure Drop ◽  
Fixed Bed ◽  
Mechanical Failure ◽  
Fixed Bed Reactor ◽  
Catalyst Pellets

A Trickle Fixed-Bed Recycle Reactor Model for the Fischer-Tropsch Synthesis

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Kyle M. Brunner ◽  
Joshua C. Duncan ◽  
Luke D. Harrison ◽  
Kyle E. Pratt ◽  
Robson P. S. Peguin ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Prandtl Number ◽  
Fixed Bed ◽  
Effective Diffusivity ◽  
Tropsch Synthesis ◽  
Fixed Bed Reactor ◽  
Maximum Temperature ◽  
Reactor Model ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

A trickle fixed-bed reactor model for the Fischer-Tropsch synthesis applicable to both cobalt and iron catalysts which accounts for gas and liquid recycle is described. A selection of kinetic models for both iron and cobalt catalysts (4 each) is included in the reactor model and their effect on model predictions is compared. While the model is 1-D and reaction rates are determined for quasi-average radial bed temperatures, a correlation is used to account for radial thermal conductivity and radial convective heat transfer. Traditional pressure drop calculations for a packed column were modified with a correlation to account for trickle-flow conditions. In addition to describing the model in detail and showing validation results, this paper presents results of varying fundamental, theoretically-based parameters (i.e. effective diffusivity, Prandtl number, friction factor, etc.). For example, the model predicts that decreasing effective diffusivity from 7.1E-09 to 2.8E-09 m2/s results in a lower maximum temperature (518 K vs. 523 K) and a longer required bed length to achieve 60% conversion of CO (8.5 m vs. 5.7 m). Using molar averages of properties to calculate the Prandtl number for the gas phase (recommended by the authors) results in average bed temperatures up to 10 K higher and reactor lengths 17-45% shorter than assuming a Prandtl number of 0.7. Using the Tallmadge equation to estimate friction losses, as recommended by the authors, results in a pressure drop 40% smaller than using the Ergun equation. Validation of the model was accomplished by matching published full-scale plant data from the SASOL Arge reactors.

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.

scholarly journals A three dimensional CFD simulation and optimization of direct DME synthesis in a fixed bed reactor

2014 ◽  
Vol 11 (2) ◽  
pp. 323-330 ◽  
Author(s):  
Fazel Moradi ◽  
Mohammad Kazemeini ◽  
Moslem Fattahi
Keyword(s):  
Cfd Simulation ◽  
Fixed Bed ◽  
Three Dimensional ◽  
Fixed Bed Reactor ◽  
Simulation And Optimization ◽  
Dme Synthesis

Particle resolved CFD simulation on vapor-phase synthesis of vinyl acetate from ethylene in fixed-bed reactor

2020 ◽  
Vol 37 (5) ◽  
pp. 839-849
Author(s):  
Yonghui Li ◽  
Mingkai Wang ◽  
Xingxing Cao ◽  
Zhongfeng Geng
Keyword(s):  
Vinyl Acetate ◽  
Vapor Phase ◽  
Cfd Simulation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Phase Synthesis ◽  
Vapor Phase Synthesis
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