Abstract：It is important to accurately predict the size of the nanoparticle agglomerates in the study of nanoparticle fluidization. Currently, the average size of aggregates is mainly obtained from the force equilibrium model in the literature. However, the actual agglomerates in the fluidized bed have a very broad particle size distribution (PSD). In this study, a dynamic equilibrium method has been proposed to predict the PSD of agglomerates by applying the Maxwell velocity distribution law of the gas molecular kinetic theory into the fluidized bed to develop the model of agglomeration-breakage and reunion based on the microscopic force. By comparing the relative magnitude of the binding force and the separation force, the agglomeration and fragmentation were judged. In the separation force, the collision force played a vital role, and was closely related to the relative velocity of agglomeration. The results showed that the PSD of agglomerates in the fluidized bed of nanoparticles shows a chi-square distribution. The comparison was made between the model predictions and experimental data in the literature, including the agglomeration size of TiO2, Ni, SiO2 particles, and found that most of the errors were within 20%.
Ke Xiwei,Liu Daoyin,Yan Ke et al. Prediction of the Agglomerates Size Distributionin the Nanoparticle Fluidized Bed Based on Dynamic Equilibrium[J]. 化学反应工程与工艺, 2016, 32(5): 445-454.
