A Generalized Flow Regime Diagram For Fluid-Solid Vertical Transport,
2011
University of British Columbia
A Generalized Flow Regime Diagram For Fluid-Solid Vertical Transport, Xiaotao T. Bi
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
An ideal generalized flow regime diagram was proposed for fluid-solids vertical transport systems with no bottom and top restrictions. Such an ideal flow regime diagram was further extended to shed light onto the understanding of the flow regimes and instabilities encountered in bottom- restricted bubbling and circulating fluidized bed systems.
High-Flux Triple Bed Circulating Fluidized Bed (Tbcfb) Gasifier For Exergy Recuperative Igcc/Igfc,
2011
Tokyo University
High-Flux Triple Bed Circulating Fluidized Bed (Tbcfb) Gasifier For Exergy Recuperative Igcc/Igfc, Chihiro Fushimi, Guoqing Guan, Masanori Ishizuka, Yu Nakamura, Atsushi Tsutsumi, Yoshizo Suzuki, Eldin Wee, Yong Cheng, Chi-Hwa Wang
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
The flow behavior of silica sand, of average particle size 128 μm, was investigated using a large-scale triple-bed combined circulating fluidized bed (TBCFB) cold model, which was composed of a 0.1 m I.D. ×16.6 m tall riser, a solids distributor, a 0.1m I.D. × 6.5 m long downer, a gas-solids separator, a 0.75 m × 0.27 m × 3.4 m bubbling fluidized bed and a 0.158 m I.D. × 5.0 m tall gas-sealing bed (GSB) with a high solids mass flux. The main focus of this study is to determine effect of riser secondary air injection on solids mass flux …
Process Decoupling Of Plasma Enhanced Synthesis Of Chlorinated Polyvinyl Chloride (Cpvc) Particles In A Circulating Fluidized Bed,
2011
Tsinghua University
Process Decoupling Of Plasma Enhanced Synthesis Of Chlorinated Polyvinyl Chloride (Cpvc) Particles In A Circulating Fluidized Bed, Wei Lu, Teng Cao, Yong Jin, Yi Cheng
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Plasma enhanced synthesis of CPVC particles in a gas-solid plasma circulating fluidized bed reactor (PCFBR) is proposed as a novel CPVC synthesizing method. The chlorination process is decoupled into a fast initiation step in a plasma riser and a slow chlorination process in the accompanying bed. The CPVC product has good properties in terms of chlorine content and microstructure.
Flow Rate Of Solids In L-Valves,
2011
Universiti Teknologi Petronas
Flow Rate Of Solids In L-Valves, Duvvuri Subbarao
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Movement of solids in a L-valve by fluid drag due to external aeration is opposed by frictional resistance at the wall/non-moving solids. Model equations developed for the threshold aeration rate and solids flow rate as a function of aeration rate compare well with the literature data.
Cold Model Investigations Of A High Temperature Looping Process In A Dual Circulating Fluidized Bed System,
2011
Institute of Combustion and Power Plan Technology, University of Stuttgart
Cold Model Investigations Of A High Temperature Looping Process In A Dual Circulating Fluidized Bed System, Ajay R. Bidwe, Miguel A.M Dominguez, Craig Hawthorne, Heiko Dieter, Alexander Charitos, Anjia Schuster, Güenter Scheffknecht
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
The Calcium Looping process is a promising post-combustion CO2 capture technology. A 200 kWth Dual Circulating Fluidized Bed has been built at IFK, University of Stuttgart. Tests were carried out on a hydrodynamically scaled cold model. Operating parameters have been varied, while the suitability of the 200 kWth design has been proven
Bio-Gasoline From Jatropha Oil: New Applications For The Fcc- Process,
2011
Vienna University of Technology, Institute of Chemical Engineering
Bio-Gasoline From Jatropha Oil: New Applications For The Fcc- Process, Alexander Weinert, Alexander Reichhold, Peter Bielansky, Christoph Schönberger, Bettina Schumi
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Jatropha curcas L. is a very drought-resistant plant, and jatropha oil can be ex-tracted from its seeds. Whilst not suitable for human consumption, we found that it is a promising feedstock for producing (bio)-gasoline. The oil was cracked in an inter-nally circulating FCC-reactor using a Grace Davison Ultima® catalyst. The total con-version was around 65%, with ca. 40% gasoline and ca. 25% crack gas (exact num-bers varied with reactor temperature). The gasoline has a RON > 95 and oxy-gen < 0.3% m. The crack-gas consisted of ca. 35% propylene, ca. 13% 1-butene and ca. 6% ethylene.
Effects Of Particle Properties On Cluster Characteristics In A 2-D Cfb Riser,
2011
Particle Technology Research Centre The University of Western Ontario
Effects Of Particle Properties On Cluster Characteristics In A 2-D Cfb Riser, Jesse Zhu, Jing Xu
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
The characteristic of particle clusters was studied in a 2-D circulating fluidized bed riser by using a digital image system and optical fiber probes. A new parameter, cluster number fraction, was proposed to characterize the clusters. The results indicated the smaller and lighter particles have higher potential to aggregate, while the effects of particle sphericity were less significant than those of particle density and size.
Hydrodynamics Of A Loop-Seal Operated In A Circulating Fluidized Bed: Influence Of The Operating Conditions On Gas And Solid Flow Patterns,
2011
Istituto di Ricerche sulla Combustione – CNR
Hydrodynamics Of A Loop-Seal Operated In A Circulating Fluidized Bed: Influence Of The Operating Conditions On Gas And Solid Flow Patterns, Roberto Solimene, Riccardo Chirone, Piero Bareschino, Piero Salatino
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Hydrodynamic features of a loop-seal operated as solids re-injection device in a labscale cold CFB apparatus are studied. Gas flow patterns are characterized by means of gas tracing experiments with continuous injection of CO2 in the loop-seal chambers. Solids flow patterns are characterized by impulsive injection of dyecoloured particles into the supply chamber, followed by particle tracking.
Manufacture Of Granular Polysilicon From Trichlorosilane In An Internally Circulating Fluidized Bed Reactor,
2011
Tsinghua University
Manufacture Of Granular Polysilicon From Trichlorosilane In An Internally Circulating Fluidized Bed Reactor, Chenjing Wang, Tiefeng Wang, Zhanwen Wang
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
A lab scale internally circulating fluidized bed (ICFB) with a centrally located draft tube was designed to make polysilicon from trichlorosilane. Experimental results and evaluations showed that particle circulation could carry enough heat for reaction and effectively decrease wall deposition. Well grown granular polysilicon was obtained in a stable fluidization state and particle circulation rate.
Studies On Propane Dehydrogenation To Propylene In A Gas-Solid-Sold Fluidized Bed Reactor,
2011
Tsinghua University, Beijing, China
Studies On Propane Dehydrogenation To Propylene In A Gas-Solid-Sold Fluidized Bed Reactor, Yue Chu, Tongwei Wu, Yunxin Li, Zeeshan Nawaz, Yao Wang, Fei Wei
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Platinum and tin deposited on mixed support of SAPO-34 and alumina oxide at certain proportion constitute a new catalyst of good catalytic performance. The catalyst was tested in a Gas-Solid-Solid fluidized bed reactor. Cold model experiment was carried on to obtain fluidization curves and characteristic velocities. Reaction results in the GSS-FBR showed that propylene yield was improved by 5 % compared with that in micro fixed bed reactor.
Waste Wood Gasification: Distribution Of Nitrogen, Sulphur And Chlorine In A Dual Fluidised Bed Steam Gasifier,
2011
Bioenergy2020+ GmbH
Waste Wood Gasification: Distribution Of Nitrogen, Sulphur And Chlorine In A Dual Fluidised Bed Steam Gasifier, Veronika Wilk, C. Aichernig, H. Hofbauer
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Waste wood was gasified in a dual fluidised bed gasifier in order to investigate the behaviour of waste fuels in this technology. The distribution of nitrogen, sulphur and chlorine between the gasifier and combustor of the dual bed system was studied to identify the requirements for gas cleaning devices. The gasification system is suitable for the use of waste wood. A slight adaption of the gas cleaning equipment was necessary compared to gasification of natural woody biomass.
Numerical Simulations Of A Circulating Fluidized Bed With A Square Cross-Section,
2011
National Energy Technology Laboratory
Numerical Simulations Of A Circulating Fluidized Bed With A Square Cross-Section, Tingwen Li, S Pannala, C. Guenther
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
In this study, both 2D and 3D numerical simulations of a well-documented circulating fluidized bed with a square cross-section were conducted. With some assumptions, a series of 2D simulations was first carried out to study the influence of grid resolution, initial flow field, and boundary condition on the flow hydrodynamics. It was found that 2D simulations under-predicted the solids inventory even with the finest grid (10-particle-diameter grid size). On the other hand, a 3D simulation with relatively coarse grid was found in better agreement with the experimental data. Differences between 2D and 3D simulations were briefly discussed.
Effects Of Gas Velocity And Solid Hold-Up On The Sub-Grid Behavior Of Riser Flows,
2011
University of São Paulo, School of Engineering of São Carlos, Dept. of Mech. Engng
Effects Of Gas Velocity And Solid Hold-Up On The Sub-Grid Behavior Of Riser Flows, Christian Costa Milioli, Fernando Eduardo Milioli
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Two-fluid highly resolved sub-grid simulations (SGS) of riser flows were developed under realistic gas velocities and solid hold-ups, for a solid phase derived from high Stokes number particles. The results showed that both gas velocity and solid hold-up considerably affect the effective hydrodynamics of the solid phase.
Co2 Looping Cycle For Co2 Separation,
2011
Niigata University
Co2 Looping Cycle For Co2 Separation, Tadaaki Shimizu, Takayuki Takahashi, Hiroko Narisawa, Yasuyuki Murakami, Liuyun Li, Heejon Kim
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
A dual fluidized bed process using CaO-based solid sorbent is considered to be a promising technology to separate CO2 from flue gas with low energy penalty. As reactor for CaO-looping cycle, both bubbling fluidized bed and “fast” fluidized bed are available, thus four possible combinations, (bubbling or fast absorber)x(bubbling or fast regenerator), are conceivable for this process. In this work, the authors discuss favorable combination of reactor type from viewpoints of heat removal from carbonation reactor and on energy penalty associated with dilution of pure oxygen by CO2 in the regenerator. As conclusion, suitable combination was found to be bubbling …
Energetic Optimization Of The Lignin Pyrolysis For The Production Of Aromatic Hydrocarbons,
2011
Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology, Hamburg, Germany
Energetic Optimization Of The Lignin Pyrolysis For The Production Of Aromatic Hydrocarbons, Miika Franck, Ernst-Ulrich Hertge, Stefan Heinrich, Bea Lorenz, Joachim Werther
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
The energy supply of the endothermic lignin pyrolysis process in a circulating fluidized bed is to be achieved by recirculation of bed material, which is heated by combustion of the by-products char and permanent gases in a separate combustor. The feasibility of this concept is examined by the investigation of the yield of the byproducts in pyrolysis experiments, char combustion kinetics, the pyrolysis energy demand and the combustion energy of the char and the non-condensable gases. It is shown that the integrated pyrolysis-combustion process is feasible and even produces an energy surplus of 4 MJ/kg raw lignin, which can be …
Effect Of Wall Boundary Conditions And Mesh Refinement On Numerical Simulation Of Pressurized Dense Fluidized Bed For Polymerization Reactor,
2011
Université de Toulouse, CNRS, France
Effect Of Wall Boundary Conditions And Mesh Refinement On Numerical Simulation Of Pressurized Dense Fluidized Bed For Polymerization Reactor, Pascal Fede, Olivier Simonin, Renaud Ansart, Herve Neau, I. Ghouila
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
The effect of the mesh refinement and the solid phase boundary condition are investigated for numerical simulation of dense pressurized fluidized bed. Two fluidized beds have been considered: a laboratory-scale device and a pilot-scale facility. A relation is proposed to scale-up the numerical simulation and preserving the spatial resolution accuracy. As expected the boundary condition of the solid phase modifies the behaviour of the fluidized bed. Compared to free-slip wall boundary condition, a no-slip condition improves the numerical predictions with respect to available experimental data.
The Development Of A Novel Cu-Mn Oxygen Carrier For The Chemical Looping Gasification Of Biomass,
2011
Department of Chemical Engineering, Ecole Polytechnique de Montreal
The Development Of A Novel Cu-Mn Oxygen Carrier For The Chemical Looping Gasification Of Biomass, M. Aghabararnejad, Jamal Chaouki, Gregory S. Patience
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Circulating fluidized bed technology applied to combustion processes in which oxygen and fuel are fed into separate reactors is referred to as Chemical Looping Combustion. Typically, oxygen reacts with a reduced metal (-oxide), then it is transferred to a second vessel where the metal oxide is reduced by a hydrocarbon. In chemical looping gasification, a fuel is contacted indirectly by oxygen and/or steam again with a metal oxide shuttling between two vessels reducing the contact between fuel and air. In this case, a concentrated stream of syngas exits the fuel reactor undiluted by nitrogen. The objective of this study is …
A Pyrolysis Pilot Unit Integrated To A Circulating Fluidized Bed Boiler - Experiences From A Pilot Project,
2011
Metso Power
A Pyrolysis Pilot Unit Integrated To A Circulating Fluidized Bed Boiler - Experiences From A Pilot Project, J. Autio, J. Lehto, A. Oasmaa, Y. Solantausta, P. Jokela, J. Alin
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
A novel integrated pyrolysis pilot plant has been built in Tampere, Finland by Metso, in co-operation with UPM, Fortum and VTT. A 7 tons of bio-oil per day (2 MWfuel input) fast pyrolysis unit has been integrated with Metso’s 4 MWth CFB pilot boiler. Test runs of bio-oil production have been carried out during 2009-2010. More than 80 tons of bio-oil has been produced and utilization tests have been started in district heating burner applications.
High-Resolution Simulations Of Gas-Solids Jet Penetration Into A High- Density Riser Flow,
2011
National Energy Technology Laboratory
High-Resolution Simulations Of Gas-Solids Jet Penetration Into A High- Density Riser Flow, Tingwen Li, C. Guenther
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
High-resolution simulations of a gas-solids jet in a 0.3 m diameter and 15.9 m tall circulating fluidized bed (CFB) riser were conducted with the open source software-MFIX. In the numerical simulations, both gas and solids injected through a 1.6 cm diameter radial-directed tube 4.3 m above the bottom distributor were tracked as tracers, which enable the analysis of the characteristics of a two-phase jet. Two jetting gas velocities of 16.6 and 37.2 m/s were studied with the other operating conditions fixed. Reasonable flow hydrodynamics with respect to overall pressure drop, voidage, and solids velocity distributions were predicted. Due to the …
A Modeling Study Of Gas Streaming In A Deep Fluidized Bed Of Geldart A Particles,
2011
University of Tehran
A Modeling Study Of Gas Streaming In A Deep Fluidized Bed Of Geldart A Particles, Shayan Karimipour, Todd S. Pugsley
10th International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10
Gas streaming has been modeled in a deep fluidized bed of 5 m depth and 0.3 m inside diameter. The model results suggest that the lower pressure drop of the stream zone compared to the remainder of the bed is the reason for severe streaming flow in deep beds. The effects of different parameters such as bed depth, gas velocity and particle size on the severity of the streaming flow are also evaluated with the model.
