Cfd Simulation Of The Reacting Flow Process Of Coal Pyrolysis To Acetylene In Hydrogen Plasma Downer Reactors,
2010
Tsinghua University
Cfd Simulation Of The Reacting Flow Process Of Coal Pyrolysis To Acetylene In Hydrogen Plasma Downer Reactors, Binhang Yan, Yi Cheng, Yong Jin, Yi Cheng
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A comprehensive computational fluid dynamics (CFD) model was established to describe the reacting flow of coal pyrolysis in hydrogen plasma downer reactors. The model predictions showed good accordance with the experimental results of the 2-MW and 5-MW pilot-plant reactors. The operating conditions were optimized to improve the 5-MW reactor performance.
Cfd-Dem Simulation Of Syngas-To-Methane Process In A Fluidized-Bed Reactor,
2010
Tsinghua University
Cfd-Dem Simulation Of Syngas-To-Methane Process In A Fluidized-Bed Reactor, Changning Wu, Dayong Tian, Yi Cheng
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The CFD-DEM coupled approach was used to simulate the gas-solid reacting flows in a lab-scale fluidized-bed reactor for syngas-to-methane (STM) process. The simulation results captured the major features of the reactor performance including unwanted defluidization. The fluidized-bed reactor showed good performances, such as in preventing the catalyst particles from overheating and sintering.
Cfd Simulation Of A Liquid-Fluidized Bed Of Binary Particles,
2010
University of British Columbia
Cfd Simulation Of A Liquid-Fluidized Bed Of Binary Particles, Long Fan, John Grace, Norman Epstein
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The ability of computational fluid dynamics to predict the expansion and segregation of a binary solids mixture in a liquid-solid fluidized bed is investigated. Unsteady laminar flow is simulated by a modified two-dimensional Eulerian-Eulerian model in Fluent 6.3. The predictions are compared with experimental results for binary particles in the same narrow (1.00-1.18 mm) size range, but with different densities, 1600 and 1900 kg/m3, fluidized by water (1). The voidages and heights of two layers which form, each dominated by one particle species, were found to be sensitive to small changes in particle properties (diameter, density, sphericity), as well as …
Fluidization Technology For Stable Startup Of Commercial Fcc Unit,
2010
SK energy Institute of Technology
Fluidization Technology For Stable Startup Of Commercial Fcc Unit, Sung Won Kim, Gyung Rok Kim, Jae Wook Shin, Ik Sang Yoo, Hun Sik Kang, Sang Hoon Park
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Conditions for maintaining good fluidization in the start-up of FCC have been determined. Catalyst defluidization and consequent catalyst losses from reactor cyclone are mainly affected by catalyst properties and stripper operating condition based on previous commercial startup experiences. Effect of fine catalyst contents on bed fluidity was determined. Bed fluidity in stripper was analyzed with slip velocity. Finally new startup guide was proposed and it was successfully applied to commercial FCC process of SK energy, Korea.
Performance Comparison Of Syngas Methanation On Fluidized And Fixed Bed Reactors,
2010
Chinese Academy of Sciences
Performance Comparison Of Syngas Methanation On Fluidized And Fixed Bed Reactors, Yingli Wang, Jiao Liu, Qiang Li, Jian Yu, Fabing Su, Guangwen Xu
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The performance was compared on Syngas Completely Methanation at atmospheric pressure on fluidized and fixed bed reactors. From space-time yield of CH4, coke content and hot spots of bed temperature, fluidized bed technology was demonstrated to be more applicable to Syngas Completely Methanation. Characterization results showed that different carbon deposition forms were presented on the two operation modes.
Film Coating Onto Cohesive Fine Particles By A Novel Rotating Fluidized Bed Coater,
2010
Osaka Prefecture University
Film Coating Onto Cohesive Fine Particles By A Novel Rotating Fluidized Bed Coater, Tetsufumi Kondo, Hideya Nakamura, Tomohiro Iwasaki, Satoru Watano, Daisuke Iwamoto
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
In this study, film coating onto cohesive fine particles was conducted by using a novel rotating fluidized bed coater (RFBC). In order to avoid the formation of agglomeration, baffle plates were equipped inside the RFBC. Coating experiments were conducted under various operating conditions and the coated particles were evaluated based on their physical properties. As a result, coated particles having extremely small degree of agglomeration and favorable prolonged release property of a tracer material could be obtained.
Syngas Production With A Dual Fluidized Bed Gasifier For Polygeneration,
2010
Korea Institute of Industrial Technology
Syngas Production With A Dual Fluidized Bed Gasifier For Polygeneration, Uendo Lee, Young Doo Kim, Hyo Jae Jeong, In Soo Choi, Yeon Kyung Sung, Tae U Yoo, Jae Hun Song
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A pilot scale dual fluidized bed gasification system was developed for polygeneration with biomass. The gasification system is designed for supplying syngas for Fischer Tropsch (F-T) synthesis of bio-diesel and power generation with a syngas engine. Characteristics of biomass steam gasification were investigated in a lab scale bubbling fluidized bed, and hydrodynamics of a dual fluidized bed were investigated in a cold flow model. Based on the results from the lab scale test and cold flow model, a pilot scale dual fluidized bed gasifier was designed. In this paper, the developing process of the gasifier and preliminary results of system …
Fluidized Bed Combustion Of C1-C4 N-Alkanes,
2010
École Polytechnique de Montréal
Fluidized Bed Combustion Of C1-C4 N-Alkanes, Jean-Philippe Laviolette, Gregory S. Patience, Jamal Chaouki
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The non-premixed combustion of C1 to C4 n-alkanes was investigated inside a bubbling fluidized bed of inert sand particles at intermediate temperatures: 923 K (650oC) ≤ TB ≤ 1123 K (850oC). Lower (T1) and upper (T2) critical transition bed temperatures were measured for ethane, propane and n-butane as 923 K (650oC) and 1073 K (800oC), respectively. The values for methane were significantly higher with T1 = 1023 K (750oC) and T2 > 1123 K (850oC). Alkane conversion was accurately modeled with first-order kinetics and C2 to C4 n-alkanes combustion rates were characterized by a uniform Arrhenius expression: (. The reaction rate …
High Performance Computing: Clean Coal Gasifier Designs Using Hybrid Parallelization,
2010
National Energy Technology Laboratory
High Performance Computing: Clean Coal Gasifier Designs Using Hybrid Parallelization, Madhava Syamlal, C. Guenther, A. Gel, S Pannala
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
One of the targets for coal gasification in the near future is capturing 90% of the carbon with less than a 10% increase in cost of electricity. Aggressive goals like this will require innovative gasifier designs to reach the market place quickly, with less risk, and in an economically viable way. Researchers at the National Energy Technology Laboratory (NETL) are collaborating with industry, academia, and other national labs on multiphase computational models like the legacy code MFIX (Multiphase Flow with Interphase eXchange) which can help design, operate, and scale-up clean coal gasifiers to meet the challenges or a carbon constrained …
Fluidized Bed Gasification Of Biomass: A Substance Flow Analysis,
2010
Second University of Naples
Fluidized Bed Gasification Of Biomass: A Substance Flow Analysis, Umberto Arena, Fabrizio Di Gregorio, Lucio Zaccariello, M.Laura Mastellone
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A natural biomass was fed in a pilot scale bubbling fluidized bed gasifier, having a maximum feeding capacity of 100kg/h. Measurements included the syngas composition, the mass flow rate and composition of entrained fines collected at the cyclone and purge material from the wet scrubber, and the bed material characterization. The performance of the whole gasification plant and of its specific components as well as the validity of some design solutions and operating criteria have been quantitatively assessed by means of a substance flow analysis.
One-Dimensional Modeling Of Oxy-Fuel Fluidized Bed Combustion For Co2 Capture,
2010
Chalmers University of Technology
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,
2010
Nigde University
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,
2010
Columbia University, New York
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,
2010
Università della Calabria
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,
2010
Illinois Institution of Technology
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,
2010
IRO Process Science and Engineering, Australia
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,
2010
Korea Institute of Energy Research
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,
2010
Istituto di Ricerche sulla Combustione – CNR
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,
2010
The University of Western Ontario
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,
2010
Chalmers University of Technology
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.
