Abstract
Modeling of gas-solid fluidized systems has been a prevailing challenge over the last few decades. With different approaches and implementing different sub-models to capture the essential multiphase and multiscale phenomena in these systems, major advances have been achieved, even though most models are only subject to a practical validation of macroscopic parameters. The current description of fluidized beds through mathematical models relies on the inclusion of vast sub-models, leading to an unquantifiable degree of uncertainty on the models’ applicability for extrapolation studies. Furthermore, each closure and fitting parameter in the model represents a possible source of deviation, and their optimization, hence, becomes another major challenge. The recent advances in measurement techniques can enable us to troubleshoot and optimize the implemented models and sub-models based on local scale measurements. Local multiphase hydrodynamic information obtained by advanced measurement techniques can enable the validation of local predictions and optimization of the coupled sub-models, leading to the development of simplified and highly predictive models. Thus, pairing advanced experimental studies on these systems with insightful modeling approaches is required to advance the shortcoming and enhance the predictive quality of the models. In this work, an overview of the status of modeling and experimental measurement techniques for gas-solid fluidized beds is presented; then, an overview on pairing both experimental and modeling studies to improve the models’ local predictions for fluidized beds is presented.
Highlights
Gas-solid fluidized bed systems are of great interest in industrial applications, such as Fischer-Tropsch synthesis, CO2 capture, biomass combustion, gasification, drying and other catalytic processes [1,2,3,4,5]
In the context of studies of gas–solid fluidized systems, we have developed and successfully applied four different invasive and non-invasive measurement techniques that measure pointwise detailed information of the local hydrodynamics phenomena in fluidized beds and spouted beds: (i) Differential Pressure Transducer Probe (DPTP), (ii) Two-Tip Optical Fiber probe (TTOF), (iii) Dual Source γ-ray Computed Tomography (CT), and (iv) Radioactive Particle Tracking (RPT)
In an attempt to enhance the quality of the predictions of local hydrodynamic fields on gas-solid fluidization, we implemented a simplified E2P model based on the bed elasticity approach
Summary
Gas-solid fluidized bed systems are of great interest in industrial applications, such as Fischer-Tropsch synthesis, CO2 capture, biomass combustion, gasification, drying and other catalytic processes [1,2,3,4,5]. Most of the applied experimental techniques have important limitations in the level of detail and accuracy in the description of the local scale phenomena and are limited to a restricted number of locations inside the bed [25], only allowing us to measure macroscopic parameters, such as implementing absolute or differential pressure transducers [26], or fail to provide detailed time resolved measurements of the local fields [14] This represents a fundamental limitation when characterizing the hydrodynamics of chaotic fluidized systems, such as FB reactors where strong pointwise and timewise variations of the local fields have been observed [20,27]. Processes 2021, 9, 1863 models, while keeping a reduced number of coupled sub-models, for a Fluidized Bed is presented
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