Research On Electrode Control Method For Aluminum Electrolysis Cell

China’s electrolytic aluminum industry has created the largest production scale and consumer markets in the world.Currently,China’s electrolytic aluminum production capacity is surplus and electrolytic aluminum enterprises are facing losses.As electrolytic aluminum industry is energy-intensive,reduction of power costs is the key of market competition.NEU’s hardware-in-the-loop simulation platform of DC load monitoring and integrated control are based on industrial aluminum cell,consists of miniature aluminum cell and integrated control cabinet,making it possible for us to do research,modeling,simulation and monitor on aluminum electrolysis process in the laboratory.This thesis does summary of background knowledge of the process and control electrolytic aluminum by document retrieval.Principle of electrolytic production process is deeply studied and relationships between process parameters and technical indicators are carefully analyzed.Generally,equivalent cell resistance is used as a controlled object in electrode control of industrial aluminum cell for its insensitivity to current fluctuations.This thesis analyses the components of cell voltage and set up the control model between the cell resistance and electrode distance.Aluminum cell is a complex nonlinear object with time-variation,delay and inertia.,so a legacy PID controller with constant parameters is unable to meet the demand.An improved single neural unit PID algorithm is designed.,making up the shortcomings of the legacy PID controller.It is more suitable for objects with changing parameter and make it easier to tune the controller.Based on NEU’s hardware-in-the-loop simulation platform of DC load monitoring and integrated control,an electrolytic aluminum ACD control system is designed and realized.The improved single neural unit PID algorithm is programmed in LAD language,and the monitoring is realized through WinCC.