Method for monitoring interface of molten aluminum in aluminum electrolysis tank in real time

Abstract

The invention discloses a method for monitoring the interface of molten aluminum in an aluminum electrolysis tank in real time. An eddy current sensor (1) is installed in a position 200-1200mm over a molten metal in the aluminum electrolysis tank, the eddy current sensor (1) is connected with a liquid level controller (2), and the liquid level controller (2) is connected with a computer control system (3); the frequency of a high-frequency oscillation current in a front-end processor in the liquid level controller (2) is 1.25Hz-6GHz, and the high-frequency oscillation current is guided to a probe of the eddy current sensor (1) in the tank through an extension cable and generates an alternating magnetic field in a coil at the head of the probe; and when a liquid for detection gets close to the magnetic field, an induction current and an alternating magnetic field having an opposite direction with the coil at the head are generated on the surface of the liquid, so the amplitude and the phase of the high-frequency current of the coil at the head of the probe are changed, the above changes are processed by the liquid level controller (2) to be converted into an analog / digital signal, and the analog / digital signal is sent to the host computer control system (3) for processing.

Description

technical field [0001] The invention relates to a method for real-time monitoring of the molten aluminum interface in an aluminum electrolytic cell, belonging to the technical field of aluminum electrolytic cells. Background technique [0002] In the production process of aluminum electrolytic cell, under the action of strong electromagnetic force, the molten electrolyte / aluminum liquid interface in the cell will fluctuate, rotate, and twist, which will increase the secondary reaction of the electrolytic cell and reduce the current efficiency. In severe cases It will affect the normal production of aluminum electrolytic cells. It is particularly important to detect the aluminum liquid-electrolyte interface in the aluminum electrolytic cell, but in the high temperature and highly corrosive production environment in the electrolytic cell, most contact sensors cannot work in the electrolytic cell for a long time. Therefore, there is not yet a good way to monitor the aluminum l...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for real-time monitoring of the molten aluminum interface in an aluminum electrolytic cell, so as to overcome the deficiency in the prior art that the interface of the molten aluminum cannot be monitored on-line during the production of an aluminum electrolytic cell

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