Chemical Engineering Commons^™

Pickup Velocity Of Nanoparticles, Jia Wei Chew, J. Ruud Van Ommen, Aditya Anantharaman

Fluidization XV

This paper represents the first systematic study of the pneumatic conveying of nanoparticles. The minimum pickup velocity, U_pu, of six nanoparticle species of different materials (i.e., silicon dioxide (SiO₂), aluminum oxide (Al₂O₃) and titanium dioxide (TiO₂)) and surfaces (i.e., apolar and polar) were determined by the weight loss method. Specifically, the weight loss method involves measuring the mass loss from the particle sample at various superficial gas velocities (U), and the U_pu is the U value at which mass loss is zero. Nanoparticles were picked up as …

Spouting Behavior Of Binary Mixtures Of Spherical And Cylindrical Particles, Douglas W. Marshall, Nicholas W. Eimers, Nathan A. Yergenson, David C. Drown

Fluidization XV

Circulation of particles in a spouted bed is influenced by the aspect ratio of the particles. Circulation of high-aspect particles, such as grains, is similar to bulk flow of powders within a hopper, while circulation of spherical particles is better represented by funnel flow.

Deposition of high quality and high integrity coatings on nuclear fuel particles requires good circulation of the fuel particles to ensure a narrow distribution of coating thicknesses and uniform coating properties. Spouting studies were conducted with using air at room temperature in a 2-D model of a nuclear fuel particle coater to investigate the influence of …

Heat Transfer Challenge And Design Evaluation For A Multi-Stage Temperature Swing Adsorption (Tsa) Process, Gerhard Hofer, Tobias Pröll, Johannes Fuchs, Gerhard Schöny

Fluidization XV

Functionalized solid amine-based temperature swing adsorption (TSA) processes have recently been proposed as a potential way to reduce the energy-penalty of post-combustion carbon capture processes (1). If TSA is to be carried out at large scale and with high energy-efficiency, continuously operated counter-current contactors are required for thermodynamic reasons. This could, generally, be achieved by using moving bed contactors. However, the heat exchange requirement of TSA is significant and heat transfer is poor in fixed and moving beds. Therefore, multi-stage fluidized bed contactors with counter-current flow of solids and gas phase and immersed heat exchange surfaces may solve the heat …

Hydrodynamics Of Compartmented Fluidized Beds For Concentrated Solar Power Applications, Roberto Solimene, Riccardo Chirone, Andrea Paulillo, Piero Salatino

Fluidization XV

Application of fluidized beds to collection and thermal storage of solar radiation is beneficial in Concentrated Solar Power (CSP) systems thanks to their well-known inherently good thermal performances. Non-conventional design and operation of fluidized beds based on uneven or unsteady (pulsed) fluidization (1), may further enhance their thermal performances improving the potential for applications in the very demanding CSP systems. Dense gas-fluidized beds have the potential to effectively accomplish three complementary tasks: the collection of incident solar radiation; the heat transfer of the incident power to immersed tube bundles of high-efficiency steam and/or organic Rankine cycles (ORC) and the thermal …

Attrition Rate Of Iron Ore In The Gas-Solid Fluidized Beds With The Wide Size Distribution, Dong-Hyun Kang, Chang Kuk Ko, Dong Hyun Lee

Fluidization XV

The effects of superficial gas velocity (U_g = 1.25 – 3.00 m/s) and distributor hole size (8.0 – 12.4 mm) on the attrition rate of iron ore in a gas-solid fluidized bed with 0.076 m ID ´ 3.7 m height with or without circulation were investigated. The particle density and the Sauter mean diameter of fresh iron ore were 3,705 kg/m³ and 357 m, respectively. When the kinetic energy rate from the orifice was equal or greater than 180 J/s, the trend of attrition rate could be determined. The attrition rate was determined by measuring the fractional mass …

Carbon Dioxide Recovery By Means Of Tsa In A Sound Assisted Fluidized Bed Of Fine Activated Carbon, Raganati Federica, Ammendola P

Fluidization XV

A large decrease in CO₂ emissions through capturing and separation will be required to keep greenhouse gases at tolerable levels (1). Though several CO₂ capture technologies have been proposed, temperature swing adsorption (TSA), consisting in adsorbing the CO₂ on a solid material and, then, inducing the sorbent regeneration and CO₂ recovery by a temperature increase and gas purge, has the potential to become one of the leading techniques by complementing or replacing the current absorption technology due to its low energy requirement (2). With reference to the sorbent, great attention is focused on fine powders (3). …

Predicting Gas-Flow Distribution In Pilot-Scale Fluidized Beds Using Cfd Simulations, Akhilesh Bakshi, C. Altantzis, A. F. Ghoniem, L. R. Glicksman

Fluidization XV

Bubbling fluidized beds are used extensively in energy and chemical industries because of their excellent heat and mass transfer characteristics. Recently, CFD has been identified as a useful tool for predicting reactor performance, but application to large scales continues to be challenging because of limitations on computational resources. Given that the hydrodynamics can largely be characterized by bubbles rising through the bed, a more feasible approach for investigating large-scale reactors is to quantify bubble dynamics and specifically, gas distribution in different phases- visible bubble flow, bubble-through flow and dense-phase flow.

In this study, 3D CFD simulations of bubbling fluidized beds …

Novel Method To Meassure Fine Particle Circulation Rates In Draft Tube Conical Spouted Beds, Idoia Estiati, Haritz Altzibar, Mikel Tellabide, Martin Olazar

Fluidization XV

The spouted bed regime is an alternative contact method to fixed and fluidized beds. The ratio between the inlet diameter and particle diameter limits the scaling-up of spouted beds (the inlet diameter should be smaller than 20-30 times the particle diameter). The insertion of a draft tube is the way of overcoming this limitation.

Particle cycle time is defined as the time the particle takes to travel from the top of the annulus downwards and back again to its starting point. Since the proportion of time spent by a particle in the spout is insignificant compared with that spent in …

Modelling Study Of Two Chemical Looping Reforming Reactor Configurations: Looping Vs. Switching, Joana F. Morgado, Schalk Cloete, John Morud, Thomas Gurker, Shahriar Amini

Fluidization XV

Autothermal Chemical Looping Reforming (CLR) is a promising technology for hydrogen production with integrated CO₂ separation. Conventional CLR employs two fluidized beds (fuel and air reactors) with an oxygen carrier circulating between them. In this way, CLR supplies heat to the endothermic reforming reaction while avoiding fuel/nitrogen mixing. This configuration can achieve steady operation and low gas leakages between reactors, but has some drawbacks. The complex interconnected configuration is challenging to scale up, especially under the pressurized conditions required for high process efficiency. Moreover, the external circulation of particles through cyclones and loop seals increases reactor costs and imposes …

Characterization Of Fuel Segregation In A Fluidized Bed By Magnetic Particle Tracking, David Pallarès, Anna Köhler, Alexander Rasch, Filip Johnsson

Fluidization XV

A Magnetic Particle Tracking (MPT) system is used to experimentally characterize the vertical distribution of fuel particles in a fluidized bed. The measurements are carried out in a fluid-dynamically down-scaled cold unit resembling a 1×1 m2 boiler operating at 850 °C. The MPT system yields spatial and temporal information of the tracer particle with accuracies in the order of 10-3 m and 10-3 s, respectively. The MPT system is used to study how fuel segregation is influenced by physical properties of the fuel (sizes and densities representing different fuel types) and operational conditions, such as fluidization velocity, bed height and …

Conference Program (Gpe 2016), Jamal Chaouki, Franco Berruti, Xiaotao (Tony) Bi, Ray Cocco

Fluidization XV

No abstract provided.

Conference Program (Gpe 2016), Franco Berruti, Cedric Briens

5th International Congress on Green Process Engineering (GPE 2016)

No abstract provided.

Conference Program And Abstracts, Nicolas Abatzoglou, Sascha Kersten, Dietrich Meier

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

A Framework For An Economic Model Of Novel Process For The Fractionation Of Dried Distillers Grain With Solubles, R. Zakrzewski, K. Gounaropoulos, R. Allmendinger, M. Villegas Torres, C. Ibenegbu, R. Roque, S. Farid, J. Ward, G. Lye

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Upgrade Of Flash Pyrolysis Condensate By Esterification With Higher Alcohols, Tim Schulzke, Stefan Conrad, Stefan Kaluza, Tom Van Loo

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Evolution Of Palm Oil Mills Into Biorefineries: Technical, And Environmental Assessment Of Six Biorefinery Options, Jesus Alberto Garcia-Nunez, Manuel Garcia-Perez, Daisy Tatiana Rodriguez, Nidia Elizabeth Ramirez, Carlos Fontanilla, Claudio Stockle, James Amonette, Craig Frear, Electro Silva

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Organosolv Pretreatment As A Major Step Of Lignocellulosic Biomass Refining, Dimitrios Sidiras, Ioanna Salapa

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

A Review On Plasma Technologies Applied To Thermo-Chemical Biomass Conversion, François Gitzhofer

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Upgrading Of Fast Pyrolysis Byproducts For Material Use With High Value, A. Funke, M.M. Abbas, N. Dahmen

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Fractionation Of Flash Pyrolysis Condensates By Staged Condensation, Tim Schulzke, Stefan Conrad, Jan Westermeyer

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Electrical Characterization Of Different Carbon Based Polymer Composites, Mauro Giorcelli, Aamer Abbas Khan, Patrizia Savi, Franco Berruti, Alberto Tagliaferro

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Biorecoverbiomass Residues Conversion & Valorisation For An Economic Refinery, Paul J. De Wild

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Pure Aromatics From Biomass, Matti Reinikainen, David Thomas, Pekka Simell, Ikka Hannula

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Organosolv Pretreatment As A Major Step Of Lignocellulosic Biomass Refining, Dimitrios K. Sidiras, Ioanna S. Salapa

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Synthetic Fuels From 3-Φ Fischer-Tropsch Synthesis Using Bio-Derived Gas Feed And Novel Nanometric Catalysts, James Aluha, Nadi Braidy, Yongfeng Hu, Ajay Dalai, Nicolas Abatzoglou

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Production Of Activated Carbons From Pyrolytic Biochar, Anastasia Colomba, Franco Berruti, Cedric Briens, Ajay Dalai, Rambabu Nedunury, Alberto Colomba, Silvia Fiore, Giuseppe Genon

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Experimental Study Of Biomass Fast Pyrolysis, Felipe Buendía-Kandia, Guillain Mauviel, Francis Billaud

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Two-Stage Thermochemical Conversion Of Lignin Into Aromatic Chemicals, Paul J. De Wild, A. Kloekhorst, H. H. Heeres, W. J.J. Huijgen

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Autothermal Fast Pyrolysis Of Wood Residuesfor Wood Adhesives, Dongbing Li, Franco Berruti, Cedric Briens

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.

Advanced Carbonized Biomass Materials For Biosensor Applications, Muhammad Noman, Alessandro Sanginario, Pravin Jagadale, Danilo Demarchi, Alberto Tagliaferro, Mauro Giorcelli

Biorefinery I: Chemicals and Materials From Thermo-Chemical Biomass Conversion and Related Processes

No abstract provided.