Gas–solid fluidization of cohesive powders

Raganati, Federica; Chirone, Riccardo; Ammendola, Paola

doi:10.1016/j.cherd.2018.03.034

Cited by 104 publications

(83 citation statements)

References 339 publications

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“…and was observed through visual observations [6]. The extent of size-segregation is now clear with our reported results.…”

Section: Minimum Fluidization Velocitysupporting

confidence: 90%

“…On the other hand, fine and ultrafine group C powders are often cohesive and exhibit poor fluidization behavior owing to strong interparticle forces. Cracks and rat holes develop due to the bypassing of fluidizing gas through the beds of these powders, resulting in poor contacting and inefficient interphase mixing [6][7][8]. Although group C particles possess high surface area, their applications in processing using gas-solid fluidization remains challenging because of interparticle forces that render their hydrodynamics unpredictable.…”

Section: Introductionmentioning

confidence: 99%

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Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization

et al. 2020

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Low-frequency flow pulsations were utilized to improve the hydrodynamics of the fluidized bed of hydrophilic ultrafine nanosilica powder with strong agglomeration behavior. A gradual fluidization of unassisted fluidized bed through stepwise velocity change was carried out over a wide range of velocities followed by a gradual defluidization process. Bed dynamics in different regions of the fluidized bed were carefully monitored using fast and sensitive pressure transducers. Next, 0.05-Hz square-wave flow pulsation was introduced, and the fluidization behavior of the pulsed fluidized bed was rigorously characterized to delineate its effect on the bed hydrodynamics by comparing it with one of the unassisted fluidized bed. Flow pulsations caused a substantial decrease in minimum fluidization velocity and effective agglomerate diameter. The frequencies and amplitudes of various events in different fluidized bed regions were determined by performing frequency domain analysis on real-time bed transient data. The pulsations and their effects promoted deagglomeration and improved homogeneity of the pulsed fluidized bed.

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“…and was observed through visual observations [6]. The extent of size-segregation is now clear with our reported results.…”

Section: Minimum Fluidization Velocitysupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization

et al. 2020

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“…Fluidizability is critically conditioned by particle size (Valverde, 2013b). In the case of fine cohesive powders (d p < 30 μm), interparticle attraction forces prevail over hydrodynamic and gravitational forces (Castellanos et al, 1999), which leads to agglomeration, gas channeling and plugging phenomena that hinder uniform fluidization (Raganati et al, 2018). Fine particles, with a large surface-to-volume ratio, would, however, provide a high gas-solids contact if fluidizable.…”

Section: Calcinermentioning

confidence: 99%

“…High-intensity acoustic fields could improve the carbonation efficiency (Valverde et al, 2013), allowing even fluidization of cohesive particles. This issue is analyzed, together with other assisting methods for fluidization in Raganati et al, 2018. Nevertheless, fluidization-assisting techniques for improving fluidization and carbonator efficiency have been tested on a lab scale.…”

Section: Carbonatormentioning

confidence: 99%

Scaling-up the Calcium-Looping Process for CO<sub>2</sub> Capture and Energy Storage

Ortíz

Chacartegui

Pérez‐Maqueda

et al. 2021

KONA

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The Calcium-Looping (CaL) process has emerged in the last years as a promising technology to face two key challenges within the future energy scenario: energy storage in renewable energy-based plants and CO 2 capture from fossil fuel combustion. Based on the multicycle calcination-carbonation reaction of CaCO 3 for both thermochemical energy storage and post-combustion CO 2 capture applications, the operating conditions for each application may involve remarkably different characteristics regarding kinetics, heat transfer and material multicycle activity performance. The novelty and urgency of developing these applications demand an important effort to overcome serious issues, most of them related to gas-solids reactions and material handling. This work reviews the latest results from international research projects including a critical assessment of the technology needed to scale up the process. A set of equipment and methods already proved as well as those requiring further demonstration are discussed. An emphasis is put on critical equipment such as gas-solids reactors for both calcination and carbonation, power block integration, gas and solids conveying systems and auxiliary equipment for both energy storage and CO 2 capture CaL applications.

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“…Nitrogen (N)-doping is an effective method to increase the polarity of carbon frameworks [37,39], which has been reported a lot in CO 2 /CH 4 /N 2 selective adsorption [21,23,37,40,41]. However, nowadays, most porous carbon is fine powder (<30 µm) belonging to Geldart's group C classification [42,43]. When the carbon powders applicate in industrial…”

mentioning

confidence: 99%

Sustainable Biomass Glucose-Derived Porous Carbon Spheres with High Nitrogen Doping: As a Promising Adsorbent for CO2/CH4/N2 Adsorptive Separation

Wang

et al. 2020

Nanomaterials

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Separation of CO2/CH4/N2 is significantly important from the view of environmental protection and energy utilization. In this work, we reported nitrogen (N)-doped porous carbon spheres prepared from sustainable biomass glucose via hydrothermal carbonization, CO2 activation, and urea treatment. The optimal carbon sample exhibited a high CO2 and CH4 capacity, as well as a low N2 uptake, under ambient conditions. The excellent selectivities toward CO2/N2, CO2/CH4, and CH4/N2 binary mixtures were predicted by ideal adsorbed solution theory (IAST) via correlating pure component adsorption isotherms with the Langmuir−Freundlich model. At 25 °C and 1 bar, the adsorption capacities for CO2 and CH4 were 3.03 and 1.3 mmol g−1, respectively, and the IAST predicated selectivities for CO2/N2 (15/85), CO2/CH4 (10/90), and CH4/N2 (30/70) reached 16.48, 7.49, and 3.76, respectively. These results should be attributed to the synergistic effect between suitable microporous structure and desirable N content. This report introduces a simple pathway to obtain N-doped porous carbon spheres to meet the flue gas and energy gas adsorptive separation requirements.

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Gas–solid fluidization of cohesive powders

Cited by 104 publications

References 339 publications

Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization

Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization

Scaling-up the Calcium-Looping Process for CO<sub>2</sub> Capture and Energy Storage

Sustainable Biomass Glucose-Derived Porous Carbon Spheres with High Nitrogen Doping: As a Promising Adsorbent for CO2/CH4/N2 Adsorptive Separation

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