Reaction Characteristics Of Two Water Gas Shift Catalysts In A Bubbling Fluidized Bed Reactor For Sewgs Process,
2010
Korea Institute of Energy Research
Reaction Characteristics Of Two Water Gas Shift Catalysts In A Bubbling Fluidized Bed Reactor For Sewgs Process, Ho-Jung Ryu, Sung-Ho Jo, Young Cheol Park, Chang-Keun Yi
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Reaction characteristics of two WGS catalysts for SEWGS process were investigated in a bubbling fluidized bed reactor. The commercial low temperature WGS catalyst produced by Süd-chemie and new catalyst produced by spray-drying method were used as bed materials. Reaction temperature, steam/CO ratio, and gas velocity were considered as experimental variables. Moreover, long-term operation results of two WGS catalysts were compared as well.
Experimental And Computational Study On The Bubble Behavior In A 3-D Fluidized Bed With A Vertical-Axis, Rotating Distributor,
2010
University Carlos III of Madrid
Experimental And Computational Study On The Bubble Behavior In A 3-D Fluidized Bed With A Vertical-Axis, Rotating Distributor, Antonio Acosta Iborra, F. Hernández-Jiménez, C. Sobrino, M. De Vega
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This work presents experimental measurements in a three-dimensional fluidized bed equipped with a novel vertical-axis, rotating distributor, together with two-fluid (Eulerian-Eulerian) CFD simulation results. The influence of the distributor rotation on the behavior of the bubbles in the experiments and in the CFD results is compared and critically analyzed.
A Novel Chemical Looping Combustion Process: Pressure Drop And Solid Circulation Rate Modelling,
2010
IFP-Lyon
A Novel Chemical Looping Combustion Process: Pressure Drop And Solid Circulation Rate Modelling, Ali Hoteit, Yazdanpanah Mohammad-Mahdi, Forret Ann, Delebarre Arnaud, Gauthier Thierry
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Experimental results from a cold flow unit of a novel chemical looping combustion configuration are presented in this paper. The system employs a non-mechanical lvalve to control solid flow rate and uses loop-seals to minimize gas leakage. A model was developed to predict solid flow rate and pressure variation in different elements of the system. The developed model was able to well predict solid flow rate within an error range of 10% for a wide solid flux range of 70 – 150 kg/m².s. Sensibility of the solid flow rate was analyzed for different operating parameters by aid of the model. …
Hydrodynamics On Chemical Looping Combustion Using Multiphase Cfd With Kinetic Theory Of Granular Flow,
2010
POSCO
Hydrodynamics On Chemical Looping Combustion Using Multiphase Cfd With Kinetic Theory Of Granular Flow, Jonghwun Jung, Isaac K. Gamwo
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The fundamental knowledge of multiphase reactive hydrodynamics of the gassolid flow is essential for the design, optimization, and operation of industrial reactors. The multiphase computational fluid dynamics (CFD) model with the kinetic theory of granular flow, MFIX, developed earlier at the National Energy Technology Laboratory have been adapted to describe a fuel reactor of chemical looping combustion (CLC) processes. To understand hydrodynamics the chemical kinetics and mass transfer in the fuel reactor have been developed, where the reduction reaction is the first order of methane gas and the oxygen in metal oxygen carriers transfer to gas phase. The fuel conversion …
The Effects Of Distributor Design On The Solids Distribution In A Cfb Riser,
2010
University of Western Ontario
The Effects Of Distributor Design On The Solids Distribution In A Cfb Riser, Jesse Zhu, Jing Xu, Botao Peng, Chao Zhang
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The influence of gas distributor design on the gas-solids flow structure was investigated in a rectangular CFB riser. The gas distributor was altered five different ways. The results show that the distributor design had significant effects on the solids distribution. The changed flow structure was maintained from the entrance to the riser top. Altering the gas distributor was an effective and practical method to change the flow structure. This study may be beneficial to CFB design and operation.
Decay Factor With Experimental Variables In Two Circulating Fluidized Bed (Cfb) Risers,
2010
Sungkyunkwan University
Decay Factor With Experimental Variables In Two Circulating Fluidized Bed (Cfb) Risers, Donghyun Lee, Hyun Suk Lee, Jong Hun Lim, Sang Soon Park, Ho Jeong Chae, Soon Yong Jeong
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The effects of the riser inlet velocity, solid mass flux and particle size on the axial solid holdup profile and decay factor were investigated using two circulating fluidized beds (CFBs) with FCC (Geldart A) particles as the bed materials. Based on the experimental results from the two-CFBs, the axial solid holdup in the two CFBs were compared with the correlations of previous studies. Also, an empirical correlation was proposed for decay factor that exhibited a good agreement with experimental data.
Effect Of Distributor Design On Solids Circulation And Gas Bypass In An Internal Circulating Fluidized Bed Reactor,
2010
University of British Columbia
Effect Of Distributor Design On Solids Circulation And Gas Bypass In An Internal Circulating Fluidized Bed Reactor, Xiaotao T. Bi, Terris T. Yang
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The effect of the distributor design on the gas bypass and solids circulation was investigated for the flat, cylindrical and conical gas distributors in a cold model internal circulating fluidized bed to provide design and operating criteria for the future application of ICFB deNOx reactor. A high gas bypass ratio from the annulus to draft tube and low from the draft tube to annulus were identified for all tested distributors. The solids circulation rates increased with the increase of both annulus and draft tube gas velocities, where the conical distributor exhibited a more flexible and stable operation. The particle size …
Radial Distribution Of Particle Clusters In A Downer Reactor Unit,
2010
The University of Western Ontario
Radial Distribution Of Particle Clusters In A Downer Reactor Unit, Mohammad Ashraful Islam, Stefan Krol, Hugo Ignacio De Lasa
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This study investigates the formation of clusters at 11 radial positions in a 2.63 cm ID downer reactor using the CREC-GS-Optiprobes. Cluster properties such as dimensions, drag coefficients and velocity across the downer unit radius are established based on the reported data and a probabilistic based model.
Flow Behaviors In A High Solid Flux Circulating Fluidized Bed Composed Of A Riser, A Downer And A Bubbling Fluidized Bed,
2010
The University of Tokyo
Flow Behaviors In A High Solid Flux Circulating Fluidized Bed Composed Of A Riser, A Downer And A Bubbling Fluidized Bed, A. Tsutsumi, Guoqing Guan, Chihiro Fushimi, Masahiro Ikeda, Yu Nakamura, Toshiyuki Suda, Masanori Ishizuka, Hiroyuki Hatano, Satoru Matsuda, Yoshizo Suzuki
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A circulating fluidized bed coal gasifier cold model which consists of an acrylic riser, a downer, and a bubbling fluidized bed were set up. Flow behaviors were investigated using silica sand with the solid mass flux up to 336 kg/m2•s. The effects of the solid inventory and the seals between the three reaction zones on the solid mass flux were investigated and discussed.
Characterization Of Turbulent Regime Behavior In The Dilute Zone Of A Circulating Fluidized Bed Riser,
2010
IUSTI Technopôle de Château Gombert
Characterization Of Turbulent Regime Behavior In The Dilute Zone Of A Circulating Fluidized Bed Riser, Abdelghafour Zaabout, Hervé Bournot, René Occelli, Bousselham Kharbouch
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This study consists in characterizing the solid phase behavior in the dilute region of a circulating fluidized bed riser (CFB) for the turbulent regime (i.e. for superficial gas velocities Uc
The Influence Of Particle Attrition On Sorbent Inventory And Particle Size Distribution In Air-Blown Circulating Fluidized Bed Combustors,
2010
Università degli Studi di Napoli Federico II, Italy
The Influence Of Particle Attrition On Sorbent Inventory And Particle Size Distribution In Air-Blown Circulating Fluidized Bed Combustors, Piero Salatino, Fabio Montagnaro, Fabrizio Scala, Massimo Urciuolo
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This paper presents a population balance model aiming at the prediction of sorbent inventory and particle size distribution establishing at steady state in the bed of an air-blown circulating fluidized bed combustor fuelled with a sulphur-bearing solid fuel. The core of the model is represented by population balance equations on sorbent particles which embody terms expressing the extent/rate of sorbent attrition/fragmentation. The effect of the progress of sulphation on attrition and fragmentation is taken into account by selection of appropriate constitutive equations. Model results are presented and discussed with the aim of clarifying the influence of particle attrition/fragmentation on sorbent …
Co-Combustion Of Korean Anthracite With Various Fuels In A Commercial Circulating Fluidized Bed Boiler,
2010
Green Growth Lab., Korea Electric Power Research Institute
Co-Combustion Of Korean Anthracite With Various Fuels In A Commercial Circulating Fluidized Bed Boiler, Jong-Min Lee, Dong-Won Kim, Pyeong-Ki Seon, Jae-Sung Kim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The effect of co-combustion of various fuels such as bituminous coal, imported anthracite, RDF and wood pellet with Korean anthracite on the combustion and environmental performance was observed in the commercial CFB boiler. The temperatures in the furnace and cyclones exits decreased with increasing the cocombustion ratio of the bituminous coal, which could achieve more stable operation of the CFB boiler. During Co-combustion of the RDF and wood pellets, the temperature of the furnace exit increased slightly with due to volatiles re-combustion which could restrict to increase the co-combustion ratio of the RDF and wood pellets in the CFB boiler. …
The Solids Flow In The Riser Of A Cfb Viewed By Positron Emission Particle Tracking (Pept),
2010
University of Warwick
The Solids Flow In The Riser Of A Cfb Viewed By Positron Emission Particle Tracking (Pept), Chian Chan, Jonathan P.K. Seville, Jan Baeyens
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The PEPT study of the riser of a CFB determines (i) the acceleration length and time, (ii) the upwards and downwards velocities; (ii) the population densities; (iii) the flow pattern at the riser bottom; and (iv) the existence of different flow regimes for associated operating conditions of gas flow rate (U) and solids circulation flux (G).
Gas-Solid Fluidization In A Microfluidic Channel,
2010
The Ohio State University
Gas-Solid Fluidization In A Microfluidic Channel, Fei Wang, L S Fan
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Experimental studies using a high speed digital camera are conducted to examine gas-solid fluidization in microfluidic channels (3mmX3mm and 2mmX3mm). The experimental results indicate the significant channel wall effects on the hydrodynamic properties including bed expansion and regime transition velocities. These properties are analyzed and discussed in the context of correlation equations reported for large fluidized beds.
Novel Two-Interconnected Fluidized Bed System For Selective Solid Circulation,
2010
Korea Institute of Energy Research
Novel Two-Interconnected Fluidized Bed System For Selective Solid Circulation, Ho-Jung Ryu, Jaehyeon Park, Dowon Shun, Seung-Yong Lee
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A novel two-interconnected fluidized bed system was developed to separate fine and coarse particles by means of particle size difference. Coarse (212~300 μm) and fine (63~106 μm) particles were separated perfectly using the solid separator. The effects of the fluidizing velocity, solid injection velocity, diameter of solid injection nozzle, and solid height on the solid separation rate were investigated. Moreover, continuous solid separation and circulation test up to 20 hours was performed to check feasibility of stable operation.
Pressure Balance Of A Multiple-Loop Chemical Reactor,
2010
CSIRO Process Science and Engineering
Pressure Balance Of A Multiple-Loop Chemical Reactor, Trevor D. Hadley, Ken Chiang, Nick R. Burke, Kok-Seng Lim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
For a chemical looping (CL) process it is important to determine the optimum reactor configuration that would offer good pressure balance to ensure smooth transfer of the solids between the reactor loops as well as satisfying the oxygen carrier and heat requirements. A variation of the CL process for production of enriched hydrogen stream is investigated which adopts multiple reactor loops. A pressure balance model is developed and a methodology is proposed to find a feasible reactor configuration at an industrial scale production of hydrogen.
Aeration And Mixing Behaviours Of Binary Mixtures Of Nano-Sized Powders Under Sound Vibration,
2010
Istituto di Ricerche sulla Combustione - CNR
Aeration And Mixing Behaviours Of Binary Mixtures Of Nano-Sized Powders Under Sound Vibration, Paola Ammendola, R. Chirone
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The aeration behaviour of three different nano-sized powders, Al2O3, Fe2O3 and CuO, fluidized under the application of acoustic fields of different intensities (125-150 dB) and frequencies (50-300 Hz) has been characterized. The characterization of the fluidization of binary mixtures of Al2O3 and Fe2O3 has been also investigated under the application of acoustic fields of 120 Hz and of two different intensities, 130 and 135 dB, and varying the relative amount of two powders from 17 to 50 %wt of Fe2O3. The addition of Fe2O3 has a beneficial effect on fluidization quality of Al2O3 even for the lowest amount of Fe2O3. …
Experiments And Modelling Of Micro-Jet Assisted Fluidization Of Nanoparticles,
2010
Delft University of Technology
Experiments And Modelling Of Micro-Jet Assisted Fluidization Of Nanoparticles, J. Ruud Van Ommen, David M. King, Alan Weimer, Robert Pfeffer, Berend Van Wachem
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The fluidization of nanoparticle agglomerates can be largely improved by using downward pointing micronozzles, creating a high-velocity jet, as experimentally shown. By discrete particle simulations – treating the agglomerates as single particles – we show that the main reason is probably the reduction of the agglomerate size by agglomerate-agglomerate collisions.
Design Of New Fluidized Bed Reactors For Cvd - Processes,
2010
University of Erlangen-Nuremberg
Design Of New Fluidized Bed Reactors For Cvd - Processes, T. Strer, M. Schober, K.-E. Wirth
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A new concept of fluidized bed will be shown which can be used for various gas-tosolids reactions (e.g. chemical vapour deposition (CVD) reactions) with high throughput like the production of new materials. For the design and scale-up of the new bubbling fluidized bed with vertically aligned vertical nozzles the fluid dynamics of the fluidized beds have to be determined and analysed, especially the flow around the gas nozzles. A jet region around a single centrally arranged injector lance in a bubbling fluidized bed reactor is characterized by different parameters like solids concentration and jet gas distribution. It can be shown …
Plasma-Enhanced Chemical Vapour Deposition On Particles In An Atmospheric Circulating Fluidized Bed,
2010
Delft University of Technology
Plasma-Enhanced Chemical Vapour Deposition On Particles In An Atmospheric Circulating Fluidized Bed, J. Ruud Van Ommen, Elena Abadjieva, Yves L.M. Creyghton
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Plasma-enhanced chemical vapour deposition is an attractive technqiue to provide particles with a thin film. Applying a cold plasma enables us to work with temperature-sensitive materials. Using a CFB with an incorporated volume dielectric barrier discharge reactor we coated 20-30 m CuO particles with a thin SiOx layer.
