Computational and experimental study of electrostatics in gas–solid polymerization fluidized beds

Effects of external electric field on bubble and charged particle hydrodynamics in a gas–solid fluidized bed

“…9(a) that the symmetrical strong electric filed existed near the wall and the gas distributor, pointing to the centerline. That agreed quite well with the results of Jalalinejad et al [25] and Rokkam et al [3]. In the central region of the bed, the electric field declined.…”

“…This phenomenon of charge accumulation on the particles is usually unavoidable and undesirable in most dry particulate systems [1], which can lead to sparks, explosions, particle sheeting, agglomeration and even defluidization. Besides, the electrostatic charge generation will also affect the bubble dynamic behavior (such as size, shape) and the particle elutriation rates [2,3]. Although such phenomenon is unavoidable and usually acts as a disadvantage of fluidized bed operation, we can still try to utilize it and convert the harms to benefits.…”

Triboelectric charging of monodisperse particles in fluidized beds

“…The hydrodynamics of tribocharging case with a charge distribution could not be completely captured by simulations in which all particles had a single fixed charge. Other studies have shown that fixed charged simulations can predict hydrodynamics accurately, if they represent the particle charge distribution accurately. Discrepancies in hydrodynamics shown here between the bimodal tribocharging cases and the monopolar fixed charge cases can be attributed to: (1) the monopolar distribution of the fixed charge case not matching the charge distribution with sufficient accuracy or (2) aspects of charge transfer and tribocharging affecting hydrodynamics in ways not fully captured by charge distribution.…”

A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

“…The operation performance of FBRs mainly relies on polymerization reaction, polymer particle size distribution (PSD), and the operating parameters [5][6][7]. Ethylene polymerization directly determines the polymer particles flow state and the dynamic evolution of PE PSDs, and it also controls the key aspects of the process and product end-use properties [8].…”