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Articles 2461 - 2490 of 5381
Full-Text Articles in Engineering
One-Dimensional Modeling Of Oxy-Fuel Fluidized Bed Combustion For Co2 Capture, Sadegh Seddighi, David Pallarès, Filip Johnsson
One-Dimensional Modeling Of Oxy-Fuel Fluidized Bed Combustion For Co2 Capture, Sadegh Seddighi, David Pallarès, Filip Johnsson
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A one-dimensional model has been developed with the aim of investigating oxyfuel circulating fluidized bed (CFB) combustion for CO2 capture with the main focus of assessing the heat balance of the CFB loop. For different oxygen concentrations in the gas flow fed to the furnace, the model calculates the external solids recirculation and the heat load in the furnace and in external particle coolers.
Numerical Computation Of Hydrodynamic Behavior Of Biomass Particles In Circulating Fluidized Beds, Afsin Gungor Dr.
Numerical Computation Of Hydrodynamic Behavior Of Biomass Particles In Circulating Fluidized Beds, Afsin Gungor Dr.
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A model using a particle based approach is developed to accurately predict the hydrodynamic behavior of biomass particles in CFBs. Generally, the change in the pressure gradient with height in CFB riser is small. Numerical results are in good agreement with experiments, both in form and magnitude.
Tailored Synthesis Of Precipitated Magnesium Carbonates As Carbon-Neutral Filler Materials During Carbon Mineral Sequestration, Huangjing Zhao, Nathan Dadap, Ah-Hyung Alissa Park
Tailored Synthesis Of Precipitated Magnesium Carbonates As Carbon-Neutral Filler Materials During Carbon Mineral Sequestration, Huangjing Zhao, Nathan Dadap, Ah-Hyung Alissa Park
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Predictions of global energy usage and demand trends suggest that fossil fuels will remain as the main energy source for the foreseeable future. Unfortunately, the increased amount of anthropogenic carbon emitted during the energy production leads to environmental issues, including climate change. Thus, reducing carbon dioxide emissions in order to stabilize atmospheric CO2 levels is crucial, and this would not be achieved without significant changes in the energy conversion processes and the implementation of carbon capture and storage (CCS) technologies. Currently, the geological storage of carbon dioxide is considered to be the most economical method of carbon sequestration, while mineral …
Towards A Theoretical Model Of Segregating Fluidization Of Two-Solid Beds, Bruno Formisani, Rossella Girimonte, Vincenzino Vivacqua
Towards A Theoretical Model Of Segregating Fluidization Of Two-Solid Beds, Bruno Formisani, Rossella Girimonte, Vincenzino Vivacqua
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Fluidization of beds of two dissimilar solids is modelled by reworking the fundamental equations of fluidization. The approach followed illustrates the relationship between bed suspension and component segregation, as determined by differences in solid density and size. The need for empirical parameters is drastically reduced so that a unique representation of all types of mixture behaviour seems possible.
Cfd Simulation Of Pharmaceutical Particle Drying In A Bubbling Fluidized Bed Reactor, Jungkee Jang, Cezar Rosa, Hamid Arastoopour
Cfd Simulation Of Pharmaceutical Particle Drying In A Bubbling Fluidized Bed Reactor, Jungkee Jang, Cezar Rosa, Hamid Arastoopour
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The bubbling fluidized bed flow regime is characterized by high heat and mass transfer rate and leads to a relatively short drying time. In this study, the gas-solid mixing and drying of pharmaceutical particles in a bubbling fluidized bed reactor was simulated using Computational Fluid Dynamics approach.
Experimental Quantification Of The Solids Flux In An Internally Circulating Fluidized Bed, Trevor D. Hadley, Christian Doblin, José Orellana, Kok-Seng Lim
Experimental Quantification Of The Solids Flux In An Internally Circulating Fluidized Bed, Trevor D. Hadley, Christian Doblin, José Orellana, Kok-Seng Lim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Internally circulating fluidized beds (ICFBs) have been applied to a number of processes and provide a means of exchanging the bed particles from one reaction chamber to the other. Fundamental to this system is a good knowledge of the solids circulation rate (SRR). This paper summarises experimental investigations conducted using a hot tracer technique to measure the solids recirculation flux through an ICFB with a reaction and heat exchange chamber. Possible predictive models which link the bed hydrodynamics to the SRR are also evaluated.
The Effect Of Gas Temperature And Velocity On Coal Drying In Fluidized Bed Dryer, Jaehyeon Park, Dowon Shun, Dal-Hee Bae, Sihyun Lee, Jeong Hak Seo, Jae Hyeok Park
The Effect Of Gas Temperature And Velocity On Coal Drying In Fluidized Bed Dryer, Jaehyeon Park, Dowon Shun, Dal-Hee Bae, Sihyun Lee, Jeong Hak Seo, Jae Hyeok Park
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The objective of this research work is to develop fluidized bed coal dryer to overcome the disadvantages of low rank coal with high moisture such as low calorific values, costly transportation, high emissions of pollutants, and operational problem. In this paper, laboratory scale bubbling fluidized bed was used to dry high moisture, low-rank Indonesian coal to produce low moisture, high-rank coal. The effects of temperature, gas velocity and bed height to diameter ratio (L/D) on drying rate were studied to obtain information relating to optimum operating conditions. Coal characterizations (proximate analysis, ultimate analysis, Thermogravimetric Analysis (TGA), BET, Higher Heating Value …
Hydrodynamics Of Unconventional Fluidized Beds: Solids Flow Patterns And Their Influence On Mixing/Segregation Of A Large Flotsam Particle In A Bed Of Finer Solids, Roberto Solimene, Paola Ammendola, Giovanna Ruoppolo, Riccardo Chirone
Hydrodynamics Of Unconventional Fluidized Beds: Solids Flow Patterns And Their Influence On Mixing/Segregation Of A Large Flotsam Particle In A Bed Of Finer Solids, Roberto Solimene, Paola Ammendola, Giovanna Ruoppolo, Riccardo Chirone
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Gross solids circulation of solid phase and its influence on mixing/segregation of a large flotsam particle in beds of finer solids in unconventional fluidized beds has been investigated. A tapered two-dimensional fluidization column and a fluidization column equipped with a diverging cone as gas distributor have been adopted. The hydrodynamics of the gas-solid suspension in the two apparatus has been qualitatively assessed by visual observation and the trajectories of the centre-of-gravity of large flotsam particles have been evaluated to assess the extent of mixing/segregation.
Penetration Of High Velocity Horizontal Gas Jets Into A Fluidized Bed At High Temperature, Cedric Briens, Feng Li, Franco Berruti, Jennifer Mcmillan
Penetration Of High Velocity Horizontal Gas Jets Into A Fluidized Bed At High Temperature, Cedric Briens, Feng Li, Franco Berruti, Jennifer Mcmillan
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
High velocity horizontal gas jets are applied to various industrial processes. In this work, a new thermal technique has been developed to measure the penetration length of horizontal gas jets. Experiments were conducted in a fluidized bed with a height of 1.23m and a rectangular cross section of 0.10m × 0.50m. The fluidized bed particles, which were either petroleum coke or sand, were heated by an in-bed electrical heater to temperatures between 300°C and 500°C. Cold gases, such as helium, nitrogen, carbon dioxide, were injected into the hot fluidized bed via a horizontal nozzle operating over a range of velocities. …
Evaluation Of Fluid Dynamics In A Hot And A Cold System Of Interconnecting Fluidised Beds, Fredrik Lind, Martin Seemann, Henrik Thunman
Evaluation Of Fluid Dynamics In A Hot And A Cold System Of Interconnecting Fluidised Beds, Fredrik Lind, Martin Seemann, Henrik Thunman
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Operation controllability and fluid dynamics were evaluated in a system of interconnecting fluidised beds. Results indicate that the solid circulation is controllable and possible to determine from pressure measurements. Sufficient gas tightness of the loop-seals and flexibility in controlling of solid fluxes was indicated.
A Perspective On Development Of Novel Fluidized Bed Processes For A More Sustainable Global Future, John Grace
A Perspective On Development Of Novel Fluidized Bed Processes For A More Sustainable Global Future, John Grace
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Faced with the need for transformative changes to solve global problems, fluidization could play a major role in contributing in areas like carbon capture, use of renewable resources, and recovery of valuable materials from waste streams. Some current examples are discussed where the fluidization community can help to find solutions
Investigation Of Reforming Activity And Oxygen Transfer Of Olivine In A Dual Circulating Fluidised Bed System With Regard To Biomass Gasification, Stefan Koppatz, Tobias Pröll, Christoph Pfeifer, Hermann Hofbauer
Investigation Of Reforming Activity And Oxygen Transfer Of Olivine In A Dual Circulating Fluidised Bed System With Regard To Biomass Gasification, Stefan Koppatz, Tobias Pröll, Christoph Pfeifer, Hermann Hofbauer
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Natural olivine (Mg,Fe)2SiO4 is examined in a dual circulating fluidised bed (DCFB) reactor system of 120 kWth with regard to its reforming activity. Further, the oxygen transport capacity due to redox-cycling of the iron containing part of the olivine is considered. Based on a syngas composition derived from biomass gasification, the olivine is exposed to a surrogate gas mixture of H2, CO, CO2, CH4 and a tar compound (1-methylnaphthalene) at 850 °C. The results show the tar conversion at different tar loads. The investigations reveal that a low content of oxygen is transported by the olivine due to the redox-cycling …
Fluidization Of Nanopowders: Experiments, Modeling, And Applications, J. Ruud Van Ommen, Robert Pfeffer
Fluidization Of Nanopowders: Experiments, Modeling, And Applications, J. Ruud Van Ommen, Robert Pfeffer
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Nanopowders are applied in a wide range of processes, and their use continues to increase. Fluidization is one of the best techniques available to disperse and process nanoparticles. However, nanoparticles cannot be fluidized individually; they fluidize as very porous agglomerates. Often, it is needed to apply an assisting method, such as vibration or microjets, to obtain proper fluidization. In this paper, we give a brief review of the developments in nanopowder fluidization.
Subject Index, Sang Done Kim
Subject Index, Sang Done Kim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Index
Author Index, Sang Done Kim
Author Index, Sang Done Kim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Index
A Single Particle View Of Fluidization, Jonathan Seville
A Single Particle View Of Fluidization, Jonathan Seville
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Radiation-based single particle tracking approaches have distinct advantages in investigating opaque particle systems such as fluidized beds. The principles of one of these – positron emission particle tracking (PEPT) – are summarised here, together with recent developments in the use of the technique. Applications in bubbling beds, circulating beds, in heat transfer and in coating are illustrated. PEPT is beginning to be used in validation of computational methods for simulating fluidized beds, such as discrete element methods.
Fluidization—Past & Future, Masayuki Horio
Fluidization—Past & Future, Masayuki Horio
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
With the understanding on paradigm shift in sciences as well as on the relationships between science and society, the footmarks of fluidization research and its present situation were briefly revisited so that the future directions can be defined and discussed in the fluidization society in a wider perspective.
Simulation Of Three-Fold Symmetric Photonic Crystal Structures On Top Of Gan Leds, Simeon Trieu, Xiaomin Jin, Chang Xiong, Xingxing Fu, Xiangning Kang, Guoyi Zhang, Bei Zhang
Simulation Of Three-Fold Symmetric Photonic Crystal Structures On Top Of Gan Leds, Simeon Trieu, Xiaomin Jin, Chang Xiong, Xingxing Fu, Xiangning Kang, Guoyi Zhang, Bei Zhang
Electrical Engineering
A 3-fold symmetric photonic-crystal grating is simulated using improved FDTD-model. Transmission gratings are optimized. Then, the best cases are simulated in GaN-LED models. The maximum extraction efficiency improvement is 40× greater compared to conventional LEDs.
Book Cover, Sang Done Kim
Book Cover, Sang Done Kim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Book Cover
Particle Attrition Measurements Using A Jet Cup, Ray Cocco, S.B. Reddy Karri, Yeook Arrington, Roy Hays, John Findlay, Ted Knowlton
Particle Attrition Measurements Using A Jet Cup, Ray Cocco, S.B. Reddy Karri, Yeook Arrington, Roy Hays, John Findlay, Ted Knowlton
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Particle attrition is usually detrimental as it negatively affects product quality and process cost. Thus, it is important to know how particles attrit under relevant operating conditions. Small jet cup attrition test devices (such as the Davison Jet Cup) are typically used to measure relative particle attrition for fluidized beds and risers. Ideally, the attrition rates measured in these laboratory units provide a relative indication of how the materials will behave in the commercial unit. Most jet cup devices have a cylindrical configuration. However, Particulate Solid Research, Inc. (PSRI) has found that a cylindrical jet cup attrition measurement may not …
Effects Of Imposed Solids Flux And Pressure On Gas Bypassing In Deep Fluidized Beds Of Group A Materials, Allan Issangya, Reddy Karri Dr, Ted Knowlton
Effects Of Imposed Solids Flux And Pressure On Gas Bypassing In Deep Fluidized Beds Of Group A Materials, Allan Issangya, Reddy Karri Dr, Ted Knowlton
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Tests were conducted in 0.6-m and 0.9-m-diameter units to determine the effect of imposed solids flux and system pressure on gas bypassing in deep beds of FCC catalyst particles. Imposed solids fluxes of up to 70 kg/m2s and freeboard pressures of up to about 200 kPag were used. Imposing a solids flux on the fluid bed increased the potential for gas bypassing, while increasing the system pressure had the opposite effect.
Magnetic Resonance (Mr) Measurements Of The Mass Flux In Gas-Solid Fluidized Beds, Andrew J. Sederman, Daniel J. Holland, L. F. Gladden, J. S. Dennis, C. R. Müller
Magnetic Resonance (Mr) Measurements Of The Mass Flux In Gas-Solid Fluidized Beds, Andrew J. Sederman, Daniel J. Holland, L. F. Gladden, J. S. Dennis, C. R. Müller
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Magnetic Resonance (MR) Imaging was used to measure the time-averaged voidage and particle velocity in a 3D gas-solid fluidized bed. Two different distributors were used. The mass-flux through a horizontal plane was calculated by combining the local voidage and particle velocity measurements. Based on the conservation of mass it was possible to give an error in the combined voidage and particle velocity measurements. It was found that the error in the mass flux was usually small (< 5%), albeit increasing with increasing fluidization velocities.
Study Of Solids Entrainment Into Attrition Jets In Fluidized Beds, Feng Li, Cedric Briens, Franco Berruti, Jennifer Mcmillan
Study Of Solids Entrainment Into Attrition Jets In Fluidized Beds, Feng Li, Cedric Briens, Franco Berruti, Jennifer Mcmillan
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Supersonic nozzles are applied to various fluidized bed processes, such as the production of pharmaceutical powders, fluid catalytic cracking, and fluid coking. In applications such as jet milling, it is essential to entrain a maximum flow-rate of solids from the fluidized bed into the jet cavity. Studies of solid entrainment rate into gas jets have been mostly conducted with subsonic jets and none with convergent-divergent nozzles. The purpose of this research is to study solids entrainment into jets issuing from supersonic convergent-divergent nozzles, and particularly the effects of nozzle size, nozzle mass flow-rate, injection gas properties and fluidization velocity. A …
Evaluation Of The Minimum Velocity Of Polydisperse Bed Fluidization Compounded Of Biomass Pellets And Their Mixtures With Fine Particles Of Coal, Zorin Alexander, Isemin Rafail, Viryasov Dmitriy, Kuzmin Sergey
Evaluation Of The Minimum Velocity Of Polydisperse Bed Fluidization Compounded Of Biomass Pellets And Their Mixtures With Fine Particles Of Coal, Zorin Alexander, Isemin Rafail, Viryasov Dmitriy, Kuzmin Sergey
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
It turned out that the change graphs of the absolute value of dimensionless amplitude of pressure fluctuations against air velocity can be used to evaluate values of the minimum fluidization velocity of polydisperse bed biomass pellets. An experimental verification is reported on the early predicting index of agglomeration in bubbling fluidized bed of biomass pellets and fine coal particles.
Processing Of Pure Vegetable Oils In A Continuous Fcc Pilot Plant, Peter Bielansky, Alexander Reichhold, Christoph Schönberger
Processing Of Pure Vegetable Oils In A Continuous Fcc Pilot Plant, Peter Bielansky, Alexander Reichhold, Christoph Schönberger
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The basic objective of the presented work is the application of vegetable oils as an alternative CO2-neutral feedstock for fluid catalytic cracking (FCC). The experimental test program was conducted in a fully continuously operated FCC pilot plant with intern CFB-design at Vienna University of Technology. Vegetable oils with the highest global production (soy bean oil, palm oil and rapeseed oil) were used. The addition of vegetable oil had hardly any influence on the cracking process. The gasoline achieved is oxygen free at high octane numbers.
Effects Of Liquid Swirling On Gas-To-Liquid Mass Transfer In Three-Phase Fluidized Beds, Yong Kang, Myung-Jae Seo, Hyung Oh Lim, Sung-Mo Son, Yong Jun Cho, Hi Chul Yang, Sang-Done Kim, Heon Jung, Ho Tae Lee
Effects Of Liquid Swirling On Gas-To-Liquid Mass Transfer In Three-Phase Fluidized Beds, Yong Kang, Myung-Jae Seo, Hyung Oh Lim, Sung-Mo Son, Yong Jun Cho, Hi Chul Yang, Sang-Done Kim, Heon Jung, Ho Tae Lee
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The swirling flow mode of liquid phase was adopted to promote the gas-to-liquid mass transfer in three-phase(gas-liquid-solid) fluidized beds. Effects of gas(0.01-0.09m/s) and liquid(0.035-0.172m/s) velocities, particle size(1.7-6.0mm) and swirling ratio of liquid phase(0-0.5) on the volumetric gas-to-liquid mass transfer coefficient in the bed were examined. The mass transfer coefficient increased up to 70% by adjusting the swirling flow of liquid phase, especially when the gas velocity is relatively low range. The value of gas-to-liquid mass transfer coefficient was well correlated in terms of dimensionless groups which were derived from the dimensional analysis on the mass transfer system.
Radial Distribution Of Particle Clusters In A Downer Reactor Unit, Mohammad Ashraful Islam, Stefan Krol, Hugo Ignacio De Lasa
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.
Pressure Balance Of A Multiple-Loop Chemical Reactor, Trevor D. Hadley, Ken Chiang, Nick R. Burke, Kok-Seng Lim
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.
Steam Gasification Of Low Rank Coal Chars In A Thermobalance Reactor And A Fluidized Bed Reactor, Byungho Song, Xueyan Zhu, Woongsig Moon, Won Yang
Steam Gasification Of Low Rank Coal Chars In A Thermobalance Reactor And A Fluidized Bed Reactor, Byungho Song, Xueyan Zhu, Woongsig Moon, Won Yang
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The six chars of low rank coals have been gasified with steam in a thermobalance reactor and one lignite in a fluidized bed to obtain the kinetic information needed for a design of coal gasifier. The gas-solid reaction models have been compared for their prediction ability of the gasification reaction behavior. The apparent reaction rate equations have been presented.
Numerical Experiment On Effect Of Surface Roughness For Heat And Flow Around Two Contacting Particles, Azri Bin Alias, Kuwagi K., Bin Mokhtar M.A. Takami T., Horio M.
Numerical Experiment On Effect Of Surface Roughness For Heat And Flow Around Two Contacting Particles, Azri Bin Alias, Kuwagi K., Bin Mokhtar M.A. Takami T., Horio M.
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The aim of the present work is to establish a model of heat transfer between particles by using the numerical simulation that can be incorporated in the discrete element method (DEM). The contact heat transfer between particles can be regarded as a contact thermal resistance problem. In the thermal resistance model, the local characteristics, e.g. exact contact area and heat flux distribution on particle surface, are important. However, it is difficult to measure such factors in detail. Accordingly, the authors utilized a numerical simulation. The thermal resistance was modeled by placing a small solid block between the contacting areas in …