Development of a Membrane-Assisted Fluidized Bed Reactor. 1. Gas Phase Back-Mixing and Bubble-to-Emulsion Phase Mass Transfer Using Tracer Injection and Ultrasound Experiments

2005 ◽  
Vol 44 (16) ◽  
pp. 5955-5965 ◽  
Author(s):  
S. A. R. K. Deshmukh ◽  
J. A. Laverman ◽  
A. H. G. Cents ◽  
M. van Sint Annaland ◽  
J. A. M. Kuipers
Keyword(s):  
Mass Transfer ◽  
Gas Phase ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Tracer Injection ◽  
Emulsion Phase ◽  
Back Mixing

Two Phase Dynamic Model for Gas Phase Propylene Copolymerization in Fluidized Bed Reactor

2011 ◽  
Vol 312-315 ◽  
pp. 1079-1084 ◽  
Author(s):  
Ahmad Shamiri ◽  
Mohd Azlan Hussain ◽  
Farouq S. Mjalli
Keyword(s):  
Gas Phase ◽  
Fluidized Bed ◽  
Mixed Model ◽  
Model Simulation ◽  
Fluidized Bed Reactor ◽  
Rate Of Change ◽  
Two Phase ◽  
Emulsion Phase ◽  
Proposed Model ◽  
Bubble Phase

A two-phase model is proposed for describing the dynamics of a fluidized bed reactor used for polypropylene production. In the proposed model, the fluidized bed is divided into an emulsion phase and bubble phase where the bubble phase flow pattern is assumed to be plug flow and the emulsion phase is considered to be perfectly mixed. Similar previous models consider the reaction in the emulsion phase only. In this work the contribution of reaction in the bubble phase is considered and its effect on the overall polypropylene production is investigated. The kinetic model combined with hydrodynamic model in order to develop a comprehensive model for gas-phase propylene copolymerization reactor. Simulation profiles of the proposed model were compared with those of well mixed model for the emulsion phase temperature. The simulated temperature profile showed a lower rate of change compared to the previously reported models due to lower polymerization rate. Model simulation showed that about 13% of the produced polymer comes from the bubble phase and this considerable amount of polymerization in the bubbles should not be neglected in any modeling attempt.

Gas phase hydrodynamics of a gas-solid turbulent fluidized bed reactor

1996 ◽  
Vol 51 (5) ◽  
pp. 713-723 ◽  
Author(s):  
M. Foka ◽  
J. Chaouki ◽  
C. Guy ◽  
D. Klvana
Keyword(s):  
Gas Phase ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Turbulent Fluidized Bed

Cold-Model Study on Fluidized-Bed Photo-Oxidation Reactor for Shenfu Coal

2011 ◽  
Vol 201-203 ◽  
pp. 2741-2744
Author(s):  
Ya Ting Zhang ◽  
Guang Heng Wang ◽  
Wei Zhao ◽  
An Ning Zhou
Keyword(s):  
Particle Size ◽  
Gas Phase ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Pipe Diameter ◽  
Flow State ◽  
Cold Model ◽  
Photo Oxidation ◽  
Model Study ◽  
Oxidation Reactor

The flow state of both the solid and gas phase in the fluidized-bed photo-oxidation reactor for Shenfu coal was studied by cold-model tests. The results showed that the appropriate pipe diameter, particle size of coal, and the coal addition for the gas-solid fluidized-bed reactor were 22 mm, 60-80 mesh, and 10g, respectively.

The Phase Transformations during Fluidized-Bed Combustion of Biomass

2013 ◽  
Vol 419 ◽  
pp. 366-369 ◽  
Author(s):  
Hai Peng Teng ◽  
Bin Yang ◽  
Bin Liang
Keyword(s):  
Gas Phase ◽  
Fluidized Bed ◽  
Solid Phase ◽  
Fluidized Bed Reactor ◽  
Biomass Combustion ◽  
Material Surface ◽  
Fluidized Bed Combustion ◽  
Biomass Ash ◽  
Equilibrium Modeling ◽  
Bed Material

FactSage6.1 was used to study the phase transformation at high temperature when biomass combustion in a fluidized bed reactor. The results show that eutectic was formed during the reaction process, the eutectics are formed mainly by the reaction between the silica in bed particles and the alkali species in biomass ash. The solid phase transformed to melt layer on the surface of sands particle mainly contains potassium, some calcium and magnesium, and also a few phosphorus and chlorine are found in the melt layer. The result utilizing FactSage equilibrium modeling shown that the distribution ratio of potassium in the gas phase increased with the increase of temperature, moreover, the melt of bed material surface increased when defluidized occurred.

Characteristics of gas–solid mass transfer in a cocurrent downflow circulating fluidized bed reactor

2007 ◽  
Vol 132 (1-3) ◽  
pp. 9-15 ◽  
Author(s):  
Baolin Luo ◽  
Dong Yan ◽  
Ying L. Ma ◽  
Shahzad Barghi ◽  
Jesse Zhu
Keyword(s):  
Mass Transfer ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Solid Mass
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