A system and method for on-line autonomous measurement of electrolyzer liquid level based on impedance change

Abstract

The invention relates to an online and automatic electrolytic bath liquid level measuring system and method based on impedance change. The measuring system mainly comprises an angular testing jig, a motor, an impedance probe, an electronic unit and the like, wherein the angular testing jig consists of a bottom plate, a back plate and multiple accessories, can extend into a narrow space above an electrolytic bath fire hole, can be conveniently adjusted to a horizontal reference position and can isolate electronic and electric components from thermal radiation of the fire hole, forward and backward rotation of the motor is converted into vertical sliding of the impedance probe by the aid of a worm gear, a worm mechanism and a connector, and the impedance probe measures impedance continuously. The actual problems such as high temperature, strong magnetism, slag scraping, datum level and the like are fully considered, the liquid level and the interface level of an electrolytic bath can be measured reliably, rapidly, automatically and accurately, real-time data are provided for the aluminum electrolysis production process, and the measuring system and method have great significance in energy conservation, optimization and safe operation.

Description

technical field [0001] The invention relates to the technical field of electrolyte impedance measurement, in particular to an automatic measurement method and measurement system for molten electrolyte liquid level and molten electrolytic aluminum interface based on impedance changes in high temperature and strong magnetic field environments. Background technique [0002] At present, electrolytic aluminum mainly adopts molten salt electrolysis process. Among them, the raw materials are alumina and fluoride salt, and the direct current used in the electrolytic reaction is supplied by a rectifier. Add the raw materials into the prebaked anode electrolytic cell, and introduce a strong direct current through the prebaked anode in the electrolytic cell. Liquid metal aluminum is precipitated. [0003] The liquid level of the molten electrolyte in the electrolytic cell and the interface with the bottom aluminum liquid are two important process parameters. The liquid level and int...

AI Technical Summary

Problems solved by technology

There are some problems in this kind of manual measurement: the boundary line on the surface of the probe is rough, the subjective error of position judgment is large, and the resolution of manual reading is about 1cm; the reading must be fast, and it cannot be distinguished after the brightness fades; Two people work together, which is time-consuming and inefficient; data is recorded with pen and paper, which is incompatible with the enterprise information network; after a measurement is completed, the probe needs to be beaten and cleaned for reuse

At the same time, the strong magnetic field of hundreds of gauss will have a strong attraction to the steel parts in the system, which often causes interference to the moving mechanism

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