Abstract
Fine/ultra-fine cohesive powders find application in different industrial and chemical sectors. For example, they are considered in the framework of the Carbon Capture and Storage (CCS), for the reduction of the carbon dioxide emissions to the atmosphere, and in the framework of the thermochemical energy storage (TCES) in concentrated solar power (CSP) plants. Therefore, developing of technologies able to handle/process big amounts of these materials is of great importance. In this context, the sound-assisted fluidized bed reactor (SAFB) designed and set-up in Naples represents a useful device to study the behavior of cohesive powders also in the framework of low and high temperature chemical processes, such as CO2 adsorption and Ca-looping. The present manuscript reviews the main results obtained so far using the SAFB. More specifically, the role played by the acoustic perturbation and its effect on the fluid dynamics of the system and on the performances/outcomes of the specific chemical processes are pointed out.
Highlights
Fine and ultra-fine powders, i.e., characterized by particle size lower than 30 μm, have been characterized by increased research interest in recent years
Regarding the critical issue of the sorbent regeneration [18,19,20,21], different strategies can be adopted, acting either on the pressure (PSA—pressure swing adsorption) or on the temperature (TSA—temperature swing adsorption) of the system to induce the desorption of the CO2 molecules [22,23,24,25]
calcium looping (CaL) tests have been performed for both Carbon Capture and Storage (CCS) and thermochemical energy storage (TCES) applications either with or without the assistance of the acoustic perturbation
Summary
Fine and ultra-fine powders, i.e., characterized by particle size lower than 30 μm, have been characterized by increased research interest in recent years. Fluidized beds can rely on different advantages, such as: high gas–solid contact area and efficiency, large heat/mass transfer coefficients, relatively easy control of the bed temperature uniformity, high particle flowability, flexibility in terms of types of powders to be processed, and suitability for large-scale applications [51] Regardless of these benefits of fluidized beds in handling powdered materials, it must be considered that fine/ultrafine particles, i.e., belonging to Geldart’s C group, cannot be fluidized under ordinary fluidization conditions due to their intrinsic cohesive nature [1,2,52]. The main results recently obtained by means of the SAFB setup are reviewed, focusing on how the application of the acoustic perturbation reflects on the fluid dynamics of the system, and on the performances/outcomes of the specific chemical processes carried out therein
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