500 kA铝电解槽单点打壳下料智能控制系统研究与应用

Research and Application of Intelligent Control System for Single Point Breaking Shell and Feeding of 500 kA Aluminum Electrolytic Cell

本文提出一种单点打壳下料智能控制系统,从调整打壳锤头深度解决打壳过程中的粘包问题,减轻工人维护铝电解槽的劳动强度。智能打壳下料控制系统由“数字化”智能打壳下料系统+“精确下料控制”工艺控制算法智能槽控系统+分布式工业以太网语音分区播报系统组成。介绍了打壳气缸智能优化、打壳锤头下限位置设置、打壳深度的控制管理、槽控系统下料量平衡策略以及氧化铝浓度控制策略,并将该系统应用于某大型铝电解公司500 kA系列电解槽。结果表明,安装智能打壳下料系统后,粘包数减少了70%,电解槽氧化铝浓度降低0.04%,阴极压降降低2 mV,平均电压下降5 mV,电流效率提升0.31%,直流电耗下降58 kW·h/t,节能效果显著。

This paper proposed an intelligent control system for single-point breaking shell and feeding,which solved the problem of sticking during the breaking shell process by adjusting the depth of the shelling hammer,and reduced the labor intensity of workers to maintain the aluminum electrolytic cell.The intelligent breaking shell and feeding control system is composed of“digital”intelligent breaking shell and feeding system+“precise feeding control”process control algorithm intelligent slot control system+distributed industrial Ethernet voice partition broadcast system.The intelligent optimization of the shelling cylinder,the setting of the lower limit position of the shelling hammer,the control and management of the breaking shell depth,the balance strategy of the feeding amount of the tank control system and the control strategy of the alumina concentration were introduced.The system was applied to a 500 kA series electrolytic cell of a large aluminum electrolysis company.The results show that after the installation of the intelligent shelling and blanking system,the number of sticking is reduced by 70%,the alumina concentration of the electrolytic cell is reduced by 0.04%,the cathode voltage drop is reduced by 2 mV,the average voltage is reduced by 5 mV,the current efficiency is increased by 0.31%,and the DC power consumption is reduced by 58 kW·h/t.The energy saving effect is remarkable.