Font Size: a A A

Research On Fluid Flow And Stability Of Melt In Aluminum Reduction Cells

Posted on:2015-08-03Degree:MasterType:Thesis
Country:ChinaCandidate:Z H LiuFull Text:PDF
GTID:2181330431499278Subject:Power Engineering and Engineering Thermophysics
Abstract/Summary:PDF Full Text Request
Abstract:Aluminum reduction cell is the core equipment for aluminum production process, with the rapid development of domestic aluminum industry, low energy consumption, environmental protection and efficient aluminum reduction cell is the mainly research object. In the production process of aluminum industry, melt flow conditions and stability are critical factors affecting the performance of aluminum electrolytic cell operation, which closely related to the current efficiency of aluminum reduction cell, the study of it is important for aluminum reduction cell design and production guidance.In this paper, aiming at the domestic aluminum reduction cell research limitations and shortcomings, on the basis of electromagnetic flow coupling model of aluminum cell calculations the steady-state melt flow field, emphasized on the electrolytic bath melt flow pattern, in consideration of the interaction between the flow field and electric field, established premise aluminum cell MHD model, presents a method of anode preheat for optimizing the corners anode changing. The main contents are as follows:Based on175kA aluminum reduction cell of one factory established an sequential coupling calculation model of electromagnetic and flow field in aluminum reduction cell, simulation the current distribution, the magnetic field distribution and melt flow conditions of standard conditions, and the model was validated.On the basis of electromagnetic and flow coupling model of aluminum cell calculated the electromagnetic field distribution under different conditions, and then introduced the electromagnetic force into flow field model for the steady melt flow calculating. The results show that:when not considering the interface deformation on the electromagnetic field, the melt flow field under different magnetic field direction is not the same; anode-cathode distance has little effect on the melt flow velocity, extremely high or low anode-cathode distance will lead to interfacial deformation increased; With the increase in aluminum level, velocity of metal has a weak increases, caused by low aluminum levels current increases, the interface will lead to upward deformation increased; Anode change has a very large impact on flow field, the impact of anode change in different parts of the electrolytic on melt flow is different, anode change in the corner has greater impact on melt flow compare to other positions, vertical magnetic field and horizontal current joint action is the cause of melt flow field changes; Finally, based on steady-state model simulated melt flow under the non-uniform current distribution, indicating that the uneven current has greater impact on electrolytic melt flow.Based on Maxwell’s equations and the N-S equation, the aluminum reduction cell MHD model to achieve two-way coupling calculation of electromagnetic and flow field. Application of the model to analyze the magnetic fluid flow under the x direction magnetic field, the results showed that:under the action of x direction magnetic field, anode change in B side impact on flow dramatically; reduce anode-cathode distance will lead to liquid interfaces fluctuations and uplift, anode-cathode distance increase will strengthen the stability of the melt flow in electrolytic cell; increasing magnetic field will increase melt volatility in electrolytic cell.According to the steady-state results of electrolytic cells, aiming at the melt flow instability when anode changes in the corners during aluminum production process proposed preheat cells to optimize it. In this paper, the optimization program were calculated and compared to get results of the final anode arrangement of preheat slot.
Keywords/Search Tags:Aluminum reduction cell, Numerical simulation, Meltmotion, MHD
PDF Full Text Request
Related items