Energy-saving Technologies And Application For Large-scale Prebaked Anode Aluminum Reduction Cells

China is the biggest primary aluminum production country in the world.Electrolytic aluminium production has reached 24 million tons in 2013.Aluminum electrolysis industry belongs to the enterprise of high energy-consuming profession,how to save the energy consumption to the industry has been an important goal to electrolytic aluminum enterprises.To reduce the DC power consumption of aluminum reduction cell,reducing the average voltage and improving current efficiency need doing.Now the main energy-saving technologies have the new cathode structure pot technology,the new cathode collector bar structure pot technology,high conductivity cathode collector bar technology,slotted and perforated anode technologies and so on.With the innovation and optimization of energy-saving technology,the average DC consumption was gradually reduced.The paper mainly elaborates the aluminum electrolysis energy saving theory from the theory of cell power consumption rate,energy utilization,alumina reversible breakdown voltage,energy balance and so on,next two aspects of reducing the average voltage improving electric current efficiency are analyzed in energy saving.and then the paper analyzes the energy saving principle of the new cathode collector bar structure cell and the new cathode structure cell.Both enerage saving are realized through optimizing the the structure of cathode lining.For the new cathode collector bar structure cell,the structure of new collector bar and the combined form of cathode carbon block are modified in order to reduce the level of current distribution,reduce the aluminum low fluctuation,to improve the stability of metal liquid aluminum in aluminum reduction cells,reduce solution loss of aluminum to improve current efficiency and reduce the pole pitch,reduced the power consumption of aluminium electrolysis production.To maintain production under the reduced cell voltage,cell liner insulation design is further optimized,to ensure the cell energy balance and improve the utilization rate of electric energy.new cathode structure cell can reduce the aluminum liquid velocity and fluctuation,improve the stability of liquid aluminum,increase the effective anode cathode distance,realize the orderly flow field inside the cell,along with lining insulation design,can achieve production under low voltage,low power consumption.This paper mainly studies the two cell practical application situation,detailedly analyses the voltage balance,heat balance,the furnace hearth,molecular ratio control,heat preservation technology,the computer control system,the anode effect,the main parameter measurement and assignment of standardization and refinement.The suitable technological conditions and operational requirements are obtained,the effect and existing problems are summarized,the foundation is laid for application and development of energy saving technology.Practical data show that the new cathode collector bar structure cells save 439 kWh/t-Al of energy consumption and new cathode structure cells save 626 kWh/t-Al of energy consumption compared with conventional cells.the two energy saving technology's cell voltage and per ton aluminum DC power consumption both dropped substantially,energy saving effect is remarkable.the two energy saving technology's cell is worthy of popularization and application.