Spinning Straw Into Gold: Turning Academic Papers Into Commercial Fluidized Bed Reactor Solutions,
2010
Cambridge Chemical Technologies, Inc, Cambridge, MA
Spinning Straw Into Gold: Turning Academic Papers Into Commercial Fluidized Bed Reactor Solutions, Charles O. Bolthrunis, Michael Hagan, Waheed A. Mukaddam
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This paper presents an example of academic work that has been applied in industry. A case is presented of a solution to a serious operational problem involving fluidization phenomena threatening to cause structural damage to an operating chemical reactor. The process used to analyze the problem and arrive at a probable cause and design solutions are presented.
A Study On Denitrification In A Fluidized Bed Bioreactor,
2010
National Institute of Technology, Warangal
A Study On Denitrification In A Fluidized Bed Bioreactor, L. Prasanna Lakshmi, Y. Pydi Setty, K. Vimala
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The work involves experimental investigation on biological denitrification in a fluidized bed reactor under anaerobic conditions using the microorganism Pseudomonas Stutzeri and plastic beads as fluidizing medium. The influence of various parameters like pH, initial nitrate concentration, Carbon/Nitrogen ratio, hydraulic retention time on nitrate-nitrogen removal rate from synthetic effluent prepared at the laboratory were studied in detail. The optimum operating conditions of pH, initial nitrate concentration, Carbon/Nitrogen ratio and flow rate obtained are 7.0–7.5, 15 mg/l, 1.5–2.0 and 4.41 x 10-5 m3/s respectively.
Chemical-Looping Steam Methane Reforming For Hydrogen Production In A Circulating Fluidized Bed Reactor,
2010
Korea Advanced Institute of Science and Technology (KAIST)
Chemical-Looping Steam Methane Reforming For Hydrogen Production In A Circulating Fluidized Bed Reactor, Sang Done Kim, Kang Seok Go, Young Wook Jeon, Chu Sik Park
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Two-step steam methane reforming for hydrogen production using a chemical looping system is proposed to improve the conventional processes. The reaction characteristics with iron oxides as an oxygen carrier was determined in a circulating fluidized bed reactor. From this system, high concentrated hydrogen can be continuously produced without any post treatment.
The Hot Gas Desulfurization In A Compact Two Beds System Integrated With Coal Gasification And Fisher-Tropsch System,
2010
Korea Institute of Energy Research
The Hot Gas Desulfurization In A Compact Two Beds System Integrated With Coal Gasification And Fisher-Tropsch System, Young Cheol Park, Sung-Ho Jo, Seung-Yong Lee, Chang-Keun Yi
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The hot gas desulfurization (HGD) technique is one of the elemental technologies of syngas purification having both thermal efficiency and very low emissions. The HGD is a novel method to efficiently remove H2S and COS in the syngas with regenerable sorbents at high temperature and high pressure condition. We propose a compact hot gas desulfurization system by which its operability is improved in stabilizing pressure balances among units. The proposed compact two beds system has two bubbling beds, solid injection nozzle, solid conveying line, and riser. The compact desulfurization system was located between coal gasifier and Fisher-Tropsch (F-T) reactor to …
A Novel Construction Of A Low-Pressure-Drop Air Nozzle Working With A 535mwe Cfb Boiler,
2010
Czestochowa University of Technology
A Novel Construction Of A Low-Pressure-Drop Air Nozzle Working With A 535mwe Cfb Boiler, Pawel Mirek, Wojciech Nowak, Marcin Klajny, Janusz Jabłoński
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
In the paper a novel construction of a low-pressure drop air-nozzle has been presented. It was designed in order to substitute the arrowhead nozzle working until now with a 535MWe CFB boiler. In comparison to the arrowhead nozzle the new construction has a lower pressure-drop and geometry, which is an effective barrier for backflow of a solid. In the paper numerical simulations as well as experimental studies of a new air nozzle have been presented. Laboratory tests have been conducted on a 3D test-stand equipped with six full scale air nozzles.
Development Of A Continuous Nanoparticle Coating With Electrospraying,
2010
University of British Columbia
Development Of A Continuous Nanoparticle Coating With Electrospraying, N. Ellis, J. Ruud Van Ommen, C.U. Yurteri
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Coating of micron-sized particles (host particles) with nanoparticles can result in modifying the surface properties of host particles leading to various applications. This work presents a novel concept of combining the electrospraying of nanoparticles onto the charged particles entrained out of the fluidized bed for developing a continuous coating process. By controlling the processes to effectively charge and contact particles using electric forces, we are able to fine-tune the properties of the obtained nano-coated particles.
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.
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 …
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. …
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.
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.
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.
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).
