Packed-bed reactor for short time gas phase olefin polymerization: Heat transfer study and reactor optimization

AIChE Journal ◽  
2011 ◽  
Vol 58 (1) ◽  
pp. 256-267 ◽  
Author(s):  
Estevan Tioni ◽  
Roger Spitz ◽  
J. P. Broyer ◽  
Vincent Monteil ◽  
Timothy McKenna
Keyword(s):  
Heat Transfer ◽  
Gas Phase ◽  
Olefin Polymerization ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Reactor Optimization ◽  
Short Time ◽  
Transfer Study

BiPO4/Bi2S3-HKUST-1-MOF as a novel blue light-driven photocatalyst for simultaneous degradation of toluidine blue and auramine-O dyes in a new rotating packed bed reactor: optimization and comparison to a conventional reactor

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63667-63680 ◽  
Author(s):  
S. Mosleh ◽  
M. R. Rahimi ◽  
M. Ghaedi ◽  
K. Dashtian ◽  
S. Hajati
Keyword(s):  
Blue Light ◽  
Toluidine Blue ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
X Ray ◽  
Reactor Optimization ◽  
Rotating Packed Bed ◽  
Auramine O ◽  
Simultaneous Degradation

BiPO4/Bi2S3-HKUST-1-MOF as a novel blue light active photocatalyst was synthesized and characterized by X-ray XRD, SEM, PL, BET, BJH and DRS.

Simulation of Multiphase Heat Transfer in Pebble Bed Modular Reactor

2004 ◽  
Author(s):  
Andrey A. Troshko ◽  
Ajey Y. Walavalkar
Keyword(s):  
Heat Transfer ◽  
Gas Phase ◽  
Packed Bed ◽  
Multiphase Model ◽  
Test Rig ◽  
Pebble Bed ◽  
Model Predictions ◽  
Two Phases ◽  
Drag Law ◽  
Eulerian Multiphase Model

Computational Fluid Dynamics in conjunction with an Eulerian multiphase model of heat transfer in a Pebble Bed Modular Reactor (PBMR) was validated against experimental data obtained in a test rig. The cooling gas and packed fuel pebbles constituted two phases. The velocity of pebble phase was fixed to zero and a drag law accounting for a packed bed condition was used. The density of the gas phase varied with temperature. Volume averaged effective thermal conductivities accounting for radiation and packed spheres geometry were used for both phases. Model predictions compared favorably with the experiment for two gases — helium and nitrogen and two power levels. It was found that accounting for increased affective porosity close to walls results in more realistic velocity field prediction.

The design and photoreaction kinetic modeling of a gas-phase titania foam packed bed reactor

2007 ◽  
Vol 133 (1-3) ◽  
pp. 317-323 ◽  
Author(s):  
A.O. Ibhadon ◽  
I.M. Arabatzis ◽  
P. Falaras ◽  
D. Tsoukleris
Keyword(s):  
Gas Phase ◽  
Kinetic Modeling ◽  
Packed Bed ◽  
Packed Bed Reactor

Measurements of Flow Modification by Particle Deposition Inside a Packed Bed Using Time-Resolved PIV

2008 ◽  
Author(s):  
Elvis E. Dominguez-Ontiveros ◽  
Carlos Estrada-Perez ◽  
Yassin A. Hassan
Keyword(s):  
Heat Transfer ◽  
Velocity Field ◽  
Flow Structure ◽  
Particle Deposition ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Temperature Fields ◽  
Complex Flow ◽  
Flow Modification ◽  
Complex Flow Structure

In the Advanced Gas Cooled Pebble Bed Reactors for nuclear power generation, the fuel is spherical coated particles. The energy transfer phenomenon requires detailed understanding of the flow and temperature fields around the spherical fuel pebbles. Detailed information of the complex flow structure within the bed is needed. Generally, for computing the flow through a packed bed reactor or column, the porous media approach is usually used with lumped parameters for hydrodynamic calculations and heat transfer. While this approach can be reasonable for calculating integral flow quantities, it may not provide all the detailed information of the heat transfer and complex flow structure within the bed. The present experimental study presents the full velocity field using particle image velocity technique (PTV) in a conjunction with matched refractive index fluid with the pebbles to achieve optical access. Velocity field measurements are presented delineating the complex flow structure.

Split Flow Modified Packed Bed Reactor for Cobalt Oxide Based High-Temperature TCES Systems

2019 ◽  
Author(s):  
Nasser Vahedi ◽  
Alparslan Oztekin
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Pressure Drop ◽  
Energy Density ◽  
Redox Reaction ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Flow Ratio ◽  
Packed Bed Reactors ◽  
Split Flow

Abstract The new generation of Concentrated Solar Power (CSP) plants requires high temperature and high energy density storage system with good cyclic stability. The potential solution satisfying such requirements is the thermochemical energy storage (TCES) using gas-solid redox reaction. Design of efficient storage reactor is very critical for applications of such storage systems. Packed bed reactors have a simpler design with no moving components and are more cost-effective compared to other available moving bed design configurations while having high-pressure drop is their main drawback. Any improvement in the pressure drop makes the design more suitable for commercial applications, especially at high temperature operating conditions. Cobalt oxide redox reaction has been considered for this study because of its unique features, especially high enthalpy of reaction (energy density) and high reaction temperature. A rectangular cross-section packed bed reactor with a large aspect ratio is selected as a reference conventional packed bed reactor. The novel split-flow packed bed reactor design configuration is proposed in which a portion of heat transfer fluid is passed through adjacent side channels. The split flow ratio of 1/3 has been considered for the case study. The transient two-dimensional numerical model is developed for solving mass, momentum, and energy equations for both gas and solid phases using suitable reaction kinetics for the reversible reduction and re-oxidation process. Complete storage cycle, including both the charging and discharging mode, has been simulated using finite element method. The split flow design performance is compared with the reference case considering the same size of the reaction bed. It is shown that the conversion time is increased while the pressure drop reduced below half of the pressure loss of the conventional design. Reduced mass flow rate passing through the bed results in considerable improvement in required pressure work with a penalty of storage performance. Further study is needed to optimize the split flow ratio and the surface heat transfer characteristics of the bed. The proposed design configuration could be a breakthrough in packed bed reactors, especially for high-temperature storage applications.

Modeling of unmixed combustion based packed bed reactor system for heat transfer applications

2018 ◽  
Vol 178 ◽  
pp. 367-376 ◽  
Author(s):  
Srinivas Krishnaswamy ◽  
Amol Deshpande ◽  
K.N. Ponnani
Keyword(s):  
Heat Transfer ◽  
Packed Bed ◽  
Reactor System ◽  
Packed Bed Reactor

One-step synthesis of ethanol from glycerol in a gas phase packed bed reactor over hierarchical alkali-treated zeolite catalyst materials

2020 ◽  
Vol 22 (3) ◽  
pp. 753-765 ◽  
Author(s):  
Andrii Kostyniuk ◽  
David Bajec ◽  
Blaž Likozar
Keyword(s):  
Gas Phase ◽  
Zeolite Catalyst ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Selective Conversion ◽  
One Step

High selective conversion of glycerol into ethanol was achieved in a gas-phase packed-bed reactor over hierarchical alkali-treated zeolite catalyst materials.

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