Analyses of the Influencing Factors of Rotating Impeller Degassing Process and Water Simulation Experiment

Abstract

On the basis of similarity principle a water-simulative study of the process of rotating impeller degassing (RID) was executed by means of self-made purifying system. The influencing factors on the RID process were studied and laid a theoretical basis for the further development of this kind of technique. The shape of vortex originated in rotating of impeller and its adverse effect on degassing effectiveness were discussed. Meanwhile the influences of shape as well as position of bluff body on degassing efficiency were investigated. The impacts of parameters such as gas feed rate and rotational speed of on degassing efficiency were discussed. The result revealed that the structure and design parameters of impeller are the decisive factors of effectiveness of RID facilities, and the design of the swivel head ought to aim for increasing the additional turbulent shear stress on air bubble and improving the degassing condition.

Physical Modeling of the Impeller Construction Impact on the Aluminum Refining Process

“…This requires advanced scientific research in both industrial and laboratory conditions. One of the research methods used in this field is physical modeling [10][11][12][13][14][15].…”

“…In the case of the degassing of aluminum, the research on physical modeling focused, in particular, on determinant flow patterns, such as the flow in geysers or columns, minimal dispersion, intimate dispersion and uniform dispersion [9,[27][28][29]. Camacho-Martinez et al [30] and Mi et al [14] investigated the operation of various impellers' design and their position, while Tovio et al [11] measured the size of bubbles and the distribution of gas bubbles. Camacho-Martinez et al [30], Hernandez-Hernandez et al [14] and Saternus and Botor [31] conducted studies on the removal of oxygen from water as an analogue of hydrogen removal from aluminum.…”

“…Camacho-Martinez et al [30] and Mi et al [14] investigated the operation of various impellers' design and their position, while Tovio et al [11] measured the size of bubbles and the distribution of gas bubbles. Camacho-Martinez et al [30], Hernandez-Hernandez et al [14] and Saternus and Botor [31] conducted studies on the removal of oxygen from water as an analogue of hydrogen removal from aluminum. Mainly, all researchers tested different processing parameters, such as the refining gas flow rate and impeller speed.…”

Effect of Process Variables on Kinetics and Gas Consumption in Rotor-Degassing Assisted by Physical and Mathematical Modeling

“…In addition to the models based on mass balances, in the last decade, computational fluid dynamics simulations have become an important means to describe these two fluid systems, predicting flow patterns, turbulence structure, and gas holdup by solving mass and turbulent momentum conservation equations in either an Euler-Euler or Euler-Lagrange frame of references [6]. As for physical modeling, water transparent models have been used to measure flow patterns [7], deoxidation kinetics [8,9], performance of different impeller designs [7,9,10], and bubble size and gas distribution [11].…”

Impact of Rotor Material Wear on the Aluminum Refining Process

“…In recent years, the topic of aluminum refining has attracted many researchers. Most of the works focus on understanding the phenomena occurring during the process, which is possible thanks to the use of physical modeling [10][11][12][13][14][15]. More and more often, this modeling is supplemented and at the same time verified by numerical modeling [16][17][18][19][20].…”