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.
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 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 …
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.
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.
