The smelting reduction process of the ilmenite in an electric arc furnace(EAF)is a commonly used technology for producing titanium slag in the world.It has particular significance to analyze the velocity-temperature-e...The smelting reduction process of the ilmenite in an electric arc furnace(EAF)is a commonly used technology for producing titanium slag in the world.It has particular significance to analyze the velocity-temperature-electromagnetics multi-physical field in an EAF for improving its productivity and reducing energy consumption.A transient three-dimensional mathematical model was developed to characterize the flow,heat transfer,and electromagnetic behavior in a titanium slag EAF.For describing the electromagnetic field and its effects on velocity and temperature distribution in the furnace,magnetohydrodynamic equations and conservation equations for mass,momentum,and energy were solved simultaneously by compiling the user-defined function program.The numerical model was verified by comparing with the literature data.The results indicate that the Lorentz force is the main driving force of the velocity and temperature distribution.Moreover,the influence of input current and location of electrodes on the multi-physical field distribution was also investigated.It is found that the appropriate range of input current and diameter of pitch circle are about 30,000 A and 3000-3500 mm,respectively.The mathematical model established can characterize the multi-physical field more accu-rately than before,which can provide valuable guidance for the operation improvement and design optimization of the EAF for producing titanium slag.展开更多
The removal of particles is of great importance in many fields including effluent treatment,mineral separation,clean metal production,etc.However,most of the researchers paid their attention to the two-phase flow invo...The removal of particles is of great importance in many fields including effluent treatment,mineral separation,clean metal production,etc.However,most of the researchers paid their attention to the two-phase flow involving gas–liquid or solid–liquid independently.The motion and interaction between bubbles and particles in the swirling three-phase flow field were simulated by discrete phase model.The swirling flow and the collision between bubbles and particles were governed by compiling the user-defined function program.The centripetal pressure gradient force pushes the discrete phases toward the central region,where the collision rate between particle and bubbles is improved greatly.Moreover,it proved beneficially for particle removal to increase the swirling velocity,particularly for larger particles.Thus,bubble flotation is an effective method to remove particles from the fluid.The swirling velocity was optimized,which is valuable for industrial design.展开更多
基金supported by the National Natural Science Foundation of China(No.U2003215).
文摘The smelting reduction process of the ilmenite in an electric arc furnace(EAF)is a commonly used technology for producing titanium slag in the world.It has particular significance to analyze the velocity-temperature-electromagnetics multi-physical field in an EAF for improving its productivity and reducing energy consumption.A transient three-dimensional mathematical model was developed to characterize the flow,heat transfer,and electromagnetic behavior in a titanium slag EAF.For describing the electromagnetic field and its effects on velocity and temperature distribution in the furnace,magnetohydrodynamic equations and conservation equations for mass,momentum,and energy were solved simultaneously by compiling the user-defined function program.The numerical model was verified by comparing with the literature data.The results indicate that the Lorentz force is the main driving force of the velocity and temperature distribution.Moreover,the influence of input current and location of electrodes on the multi-physical field distribution was also investigated.It is found that the appropriate range of input current and diameter of pitch circle are about 30,000 A and 3000-3500 mm,respectively.The mathematical model established can characterize the multi-physical field more accu-rately than before,which can provide valuable guidance for the operation improvement and design optimization of the EAF for producing titanium slag.
基金This work was financially supported by the National Natural Science Foundation of China(No.51874061)the Scientific Research Foundation(Hundred Talents5 Scholar)from Chongqing University and Venture&Innovation Support Program for Chongqing Overseas Returnees(cx2019026).
文摘The removal of particles is of great importance in many fields including effluent treatment,mineral separation,clean metal production,etc.However,most of the researchers paid their attention to the two-phase flow involving gas–liquid or solid–liquid independently.The motion and interaction between bubbles and particles in the swirling three-phase flow field were simulated by discrete phase model.The swirling flow and the collision between bubbles and particles were governed by compiling the user-defined function program.The centripetal pressure gradient force pushes the discrete phases toward the central region,where the collision rate between particle and bubbles is improved greatly.Moreover,it proved beneficially for particle removal to increase the swirling velocity,particularly for larger particles.Thus,bubble flotation is an effective method to remove particles from the fluid.The swirling velocity was optimized,which is valuable for industrial design.
