Intelligent shell beating control system for aluminum electrolysis

Abstract

The invention discloses an intelligent shell beating control system for aluminum electrolysis. The intelligent shell beating control system is characterized by being mainly composed of a microprocessor, a power module, a signal processing module, a shell beating signal output module, a feedback signal processing module, a tank control system signal input interface, an air cylinder control module and a sensor set, wherein the power module, the signal processing module, the shell beating signal output module and the feedback signal processing module are connected with the microprocessor, the tank control system signal input interface is connected with the signal processing module, the air cylinder control module is connected with the shell beating signal output module, and the sensor set is connected with the feedback signal processing module; and the signal processing module is composed of a frequency selecting circuit, a lowpass filtering circuit connected with the frequency selecting circuit, and a two-stage amplifier circuit connected with the frequency selecting circuit and the lowpass filtering circuit at the same time. Whether hammer heads break shell faces or not is judged by detecting shell beating feedback signals of the hammer heads, and the shell beating process is not the blind full-stroke state any more. When the shell faces are broken, the hammer heads are controlled to be lifted rapidly and disengage from an electrolytic cell, the heating time of the hammer heads is shortened, the hammer heads are prevented from being ablated and damaged, and the service life of the system is prolonged.

Description

technical field [0001] The invention relates to the field of aluminum electrolysis, in particular to an intelligent shelling control system for aluminum electrolysis. Background technique [0002] Aluminum electrolysis production adopts molten salt electrolysis process, using aluminum electrolytic cell as equipment, alumina as electrolysis raw material, and cryolite electrolyte to dissolve alumina to produce metal aluminum through electrochemical reaction. It will produce residue during the production process, which needs to be removed regularly. The traditional shelling system of the electrolytic cell outputs two shelling signals to the reversing valve to control the shelling process through the tank control machine. The shelling is carried out in a fixed full-stroke mode. This shelling method has great defects, namely 1 1. When shelling in full-stroke mode, because the hammer head is in the high-temperature electrolytic tank for a long time, a large amount of heat is tran...

AI Technical Summary

Problems solved by technology

The traditional shelling system of the electrolytic cell outputs two shelling signals to the reversing valve to control the shelling process through the tank control machine. The shelling is carried out in a fixed full-stroke mode. This shelling method has great defects, namely 1 . When shelling in full-stroke mode, because the hammer head is in the high-temperature electrolytic tank for a long time, a large amount of heat is transmitted to the cylinder, which leads to long-term heating and aging of the seal, and greatly shortens the service life.

2. There are phenomena such as hammer head melting, material blocking and gourd head sticking, which lead to serious loss of hammer head, poor feeding, and frequent anode effects. The occurrence of anode effects increases the secondary reaction of aluminum and the consumption of fluorine salts

3. The sticky gourd head on the shelling hammer head not only affects the smooth feeding, but also increases the shell surface opening, which increases the heat loss of the electrolytic cell. During electrolysis, it is necessary to remove the sticking from time to time, which consumes manpower

4. Manual cleaning of sticky gourd heads will impact the shelling cylinder rod and hammer head, which increases the probability of hammer head falling off and the failure rate of shelling cylinder

Therefore, how to prolong the service life of the shelling system of the electrolytic cell and solve the problem of poor feeding is a top priority at present

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