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
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 …
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. …
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).
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 …
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.
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.
Challenges With The Coupling Of Fluidized Beds For Chemical Looping Combustion,
2010
Hamburg University of Technology
Challenges With The Coupling Of Fluidized Beds For Chemical Looping Combustion, Marvin Kramp, Andreas Thon, Ernst-Ulrich Hartge, Stefan Heinrich, Joachim Werther
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
In the present work the system of interconnected fluidized bed reactors of a Chemical Looping Combustion (CLC) process is simulated in pilot plant scale and 100 MWth scale. Attrition models, derived from small scale laboratory experiments, are employed to predict the behavior of a large scale CLC process in terms of attrition and oxygen carrier (OC) losses. Realistic circulation mass flows of OC are calculated and the sources of the losses are further investigated. Different arrangements of cyclones are evaluated for their potential to improve the solids recovery. For example the introduction of a second-stage cyclone separation for the air …
Co-Gasification Of Coal And Wood In A Dual Fluidized Bed Gasifier Variation Of Fluidization Conditions And Load Ratio,
2010
Vienna University of Technology
Co-Gasification Of Coal And Wood In A Dual Fluidized Bed Gasifier Variation Of Fluidization Conditions And Load Ratio, Christoph Pfeifer, Isabella Aigner, Hermann Hofbauer
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Within this work the use of coal has been tested in a dual fluidized bed 100 kW - steam blown- gasifier originally designed for wood. With adjustments like fluidization conditions and fuel load, it is possible to gasify coal in load-ratios from 0 % to 100 % with this technology.
A Model On An Entrained Bed-Bubbling Bed Process For Co2 Capture From Flue Gas,
2010
Konkuk University
A Model On An Entrained Bed-Bubbling Bed Process For Co2 Capture From Flue Gas, Jeong-Hoo Choi, Chang-Keun Yi, Sung-Ho Jo
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A simplified model has been developed to investigate effects of important operating parameters on performance of an entrained-bed absorber and bubbling-bed regenerator system collecting CO2 from flue gas. The particle population balance was considered together with chemical reaction to determine the extent of conversion in both absorber and regenerator. Effects of several absorber parameters was tested in a laboratory scale process. The CO2 capture efficiency decreased as temperature or gas velocity increased. However, it increased with static bed height or moisture concentration. The CO2 capture efficiency was exponentially proportional to each parameter. Based on the absolute value of exponent of …
Characteristics And Kinetics Of Biomass Pylolysis In A Micro Fluidized Bed Reactor,
2010
Chinese Academy of Sciences
Characteristics And Kinetics Of Biomass Pylolysis In A Micro Fluidized Bed Reactor, Guangwen Xu, Shiqiu Gao, Jian Yu, Qiang Li, Jianhong Zhu, Zhengkang Duan
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A Micro Fluidized Bed Reactor (MFBR) was developed to enable on-line pulse feeding and isothermal differential reaction of particle reactant. Application of the MFBR to biomass pyrolysis demonstrated that the resulting globe kinetics parameters were 11.77 kJ/mol and 1.45 s-1 on the gas release characteristics, respectively.
Influence Of Process Parameters On Fluidised Bed Drying Of Powdered Materials,
2010
Università degli Studi del Sannio
Influence Of Process Parameters On Fluidised Bed Drying Of Powdered Materials, Piero Bareschino, Antonio Marzocchella, Piero Salatino
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The present study reports preliminary characterization about the fluidised bed drying of powdered materials. Tests were carried out in a Lexan® lab-scale fluidised bed with solids selected to effectively surrogate powders of interest in the manufacture of pharmaceuticals. The process was monitored to correlate the temperature and the flow rate of the fluidising gas, the temperature and the moisture level in the bed, the qualitative fluidisation patterns. Bed material was characterized to assess the modifications of the population of agglomerates as a function of the operating conditions.
Heavy Metal Vaporization In Fluidized Bed Combustion Of Solid Waste And Coal,
2010
Laboratoire Procédés Matériaux et Energie Solaire (CNRS-PROMES)
Heavy Metal Vaporization In Fluidized Bed Combustion Of Solid Waste And Coal, Q. Falcoz, J. Liu, Daniel J. Gauthier, G. Flamant, S. Abanades
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Solid samples, either of realistic waste model or coal, and spiked with Cd, Pb or Zn, were burned in an electrically-heated fluid bed reactor coupled to a customized ICP spectrometer, for on-line analysis of vaporized metals. For waste samples, a single kinetic law (whatever the metal), predicting the vaporization characteristic time and the time course of the metal concentration in the solid, was obtained. Tests with burning coal samples, spiked with Cd (at 820°C) and Zn (temperature range 680°C to 820°C), proved that this law is still valid, with a slight tendency to underestimation for both Cd and Zn vaporization …
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.
Combustion Characteristics And Emission Of Hazardous Air Pollutants In Commercial Fluidized Bed Combustors For Sewage Sludge,
2010
Hansol EME Co. Ltd.
Combustion Characteristics And Emission Of Hazardous Air Pollutants In Commercial Fluidized Bed Combustors For Sewage Sludge, Ha-Na Jang, Seong-Bum Park, Jeong-Hun Kim, Yong-Chil Seo
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Since the disposal of sewage sludge in ocean has been prohibited recently according to London Dumping Convention, technological need for treating sewage sludge safely and efficiently are getting increased in Korea. FBC (Fluidized Bed Combustor) technology has been selected and utilized as one of the alternatives because of combustible content in sludge, on-going process development to maintain the best combustion efficiency, and good heat recovery for energy utilization. In this paper, the process and combustion characteristics of commercially operating FBC incineration plants with the capacity ranging from 50 – 150 tons of sludge per day were investigated by comparing emission …
Investigation Of Change Of Volumetric Flow In Fluidized-Bed Reactors,
2010
University of British Columbia
Investigation Of Change Of Volumetric Flow In Fluidized-Bed Reactors, Andrés Mahecha-Botero, Franz Haseidl, Alexander Nguyen, Tingwen Li, John R. Grace
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Volumetric flow can change due to such factors as variation in the number of moles due to reaction, feed distribution, change of phase, membranes and changes in temperature and pressure. This change in volumetric flow was investigated by varying the fluidized-bed pressure in a two-dimensional steel column. Pressure was impulsively adjusted, showing large transient voids during the transitions after rapid growth of the existing bubbles. The effects of sudden depressurization as well as elevated pressure fluidization were also investigated.
Attrition Of Bed Materials And Fuel Pellets For Fluidized Bed Gasification Application,
2010
Istituto di Ricerche sulla Combustione – CNR
Attrition Of Bed Materials And Fuel Pellets For Fluidized Bed Gasification Application, P. Ammendola, R. Chirone F. Miccio, G. Ruoppolo, Fabrizio Scala
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This paper reports on a study of the attrition/fragmentation behavior of different bed materials and fuel pellets for application in fluidized bed gasification. Three different bed materials displaying catalytic activity, namely fresh and sintered dolomite and a Ni-alumina catalyst, were tested for their resistance to fragmentation and attrition in fluidized bed. The fresh dolomite displayed extensive particle breakage upon calcination and a large production of attrited fines during fluidized bed operation. The other two materials were much more resistant to attrition and appeared to be suitable for further long-term operation testing. The attrition/fragmentation resistance of three pelletized fuels, one based …
Shear-Assisted Fluidized Bed Powder-Coating,
2010
Università degli Studi del Sannio
Shear-Assisted Fluidized Bed Powder-Coating, Piero Bareschino, Francesco Pepe, Piero Salatino
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This study addresses a novel concept of dense-fluidized bed coating of objects where the effectiveness of coating is promoted by the intentional and controlled establishment of shear flow around the object. The fluidized powder is sheared by the controlled oscillatory motion of the object with respect to the fluidized bed. The proof-of-concept is given with experiments carried out using a commercial powder specifically manufactured for dry coating applications in fluidized bed. Systematic analysis of the effect of different levels of shear rate on particle mobility/adhesion and effectiveness of coverage was performed. A simple descriptive model has been developed to provide …
Heat Transfer To Immersed Cooling Tubes And Particles In A Fluidized Bed Reactor,
2010
Sumitomo Chemical Company
Heat Transfer To Immersed Cooling Tubes And Particles In A Fluidized Bed Reactor, Y. Kobayashi, Y. Mori, A. Goto, H.T. Bi J.R. Grace
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A simple heat transfer model is utilized to determine the heat transfer coefficients for multiple tubes immersed in an industrial fluidized bed reactor supporting an exothermic reaction. From the temperatures at their outlets, superheating occurs in some blocks of tubes, but not in others. A four-zone heat transfer model is then used to evaluate the axial and lateral temperature differences due to the existence of a bottom un-cooled entrance zone and two cooled zones, corresponding to the regions where superheating does and does not occur.
Heat Recovery From Melted Blast Furnace Slag Using Fluidized Bed,
2010
Niigata University
Heat Recovery From Melted Blast Furnace Slag Using Fluidized Bed, Tadaaki Shimizu, Daisuke Haga, Go Mikami, Takayuki Takahashi, Kenji Horinouchi
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A novel fluidized bed system is proposed to recover heat from melted blast furnace slag. The melted slag is fed into a fluidized bed of crushed solid slag particles. The heat of slag solidification is transported to immersed heat transfer surface through fluidizing particles. The solid slag clumps, which consist of solidified slag and bed material, are removed from the bottom. A part of the slag clumps are crushed and recycled into the bed as bed material. In the present article, conceptual design of arrangement of heat transfer surface was carried out. Fundamental study of heat recovery from melted wax …
