| Zinc is one of the important raw materials irreplaceable in the construction and development of the national economy.Zinc is used in a wide range of applications,mainly in the steel industry,electrical industry,mechanical industry,chemical industry,light industry and pharmaceutical industry.In recent years,with the increased treatment of high miscellaneous ore,resulting in repeated fluctuations in the production system,the zinc recovery rate,zinc electrowinning energy consumption and other technical and economic indicators have been significantly affected,the electrolytic tank surface has been repeatedly back-soluble,the impact of impurities such as cobalt and copper of different degrees,especially the frequent short-circuit situation,resulting in a low current efficiency of about 85%,which limits the further improvement of cathode zinc production and causes a large energy loss.When a short circuit occurs,a significant amount of current flows directly from the anode to the cathode without passing through the electrolyte,which reduces the current efficiency and increases the energy consumption of zinc electrolysis.In addition,the occurrence of a short circuit can easily cause anode burnout,resulting in significant anode repair costs.Therefore,how to detect the occurrence of short circuit is particularly important;there are relatively few studies on electrode short circuit detection at home and abroad,and there is a lack of effective detection means in the actual production environment.In the wet zinc refining process,short circuits are often accompanied by large heat and high magnetic fields,so manual inspection methods such as infrared temperature measurement,Gauss meters,and water sprinkling are usually used in the plant to determine short circuits in the pole plates.However,the use of these methods for short-circuit detection presupposes that a short circuit has occurred,producing significant thermal and magnetic effects;in fact,this time has caused a large amount of energy loss,in addition to the labor-intensive inspection work,easy to mistakenly detect and miss detection.When a short circuit occurs in the pole plate,the current flowing through the pole plate will exceed the normal value of the current for a short period of time,so the magnitude and trend of the current flowing through each pole plate can be used to determine whether a short circuit has occurred.Electrode current measurement is very difficult due to the highly corrosive zinc electrolysis environment,complex electromagnetic field distribution,and relatively small gap between the electrode plates.In this paper,the mathematical relationship between the electrode current and the magnetic induction intensity at the fixed measurement position of the pole plate is analyzed by simulating the magnetic field distribution of the electrolyzer multi-loop circuit topology with the help of COMSOL software based on the structural data of the industrial electrolyzer in the field.Based on the simulation results,an electrolyzer anode current measurement system was designed,including a detection node for measuring magnetic induction intensity and a gateway node for calculating current,and an electrode current calculation model was derived.An experimental electrolyzer was built in the laboratory to verify the measurement system and the current calculation model.Experiments show that the system proposed in this paper has stable operation and high accuracy of electrode current measurement,which can meet the needs of inter-pole short circuit detection. |
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