Intelligent shell breaking control system for aluminum electrolysis based on triode self-excited oscillating circuit

Abstract

The invention discloses an intelligent shell breaking control system for aluminum electrolysis based on a triode self-excited oscillating circuit. The intelligent shell breaking control system is mainly composed of an air cylinder control module, a microprocessor, a power module, a signal processing module, a shell breaking signal output module, a feedback signal processing module, a tank control machine signal input interface and a sensor set, wherein the power module, the signal processing module, the shell breaking signal output module and the feedback signal processing module are connected with the microprocessor, the tank control machine signal input interface is connected with the signal processing module, and the sensor set is connected with the feedback signal processing module. The intelligent shell breaking control system is characterized in that a triode self-excited oscillating module is connected between the shell breaking signal output module and the air cylinder control module in series, and the triode self-excited oscillating module is composed of an oscillating circuit and a compensation circuit connected with the oscillating circuit. According to the intelligent shell breaking control system for aluminum electrolysis, an air cylinder can be controlled more accurately through the triode self-excited oscillating module, and the phenomenon that a hammer is immersed in an electrolyte for a long time, and consequently a hourglass head is generated is avoided.

Description

technical field [0001] The invention relates to the field of aluminum electrolysis, in particular to an intelligent shelling control system for aluminum electrolysis based on a triode self-excited oscillation circuit. 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 t...

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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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