Short circuit cutoff and starting up methods and apparatuses for aluminum electrolysis series uninterrupted electrobath

Abstract

The invention discloses a short-circuit powering-off and bath opening method for a no-powering-off aluminum electrolyte bath in aluminum electrolysis series and a device for utilizing the same. The method comprises the following steps: the short-circuit powering-off of the aluminum electrolyte bath needing major repair is carried out by a short-circuit block of the aluminum electrolyte bath, and the aluminum electrolyte bath needing restart after the major repair is powered on by disconnecting the short-circuit block, the short-circuit block and a riser bus bar of the aluminum electrolyte bath are in parallel connection with a disconnected arc-extinguishing switch provided with an arc-extinguishing cover; and then the bath stopping short-circuit powering-off operation is carried out. In the invention, the primary current conversion mode in the prior aluminum electrolyte bath is turned into the secondary current conversion mode for completing the bath opening and the bath stopping of the aluminum electrolyte bath, which can complete the repair or replacement of the aluminum electrolyte bath without being powered off or with greatly lowering current, so that when the aluminum electrolyte bath is powered off or has current lowered for repair, the impact on the power grid and the damage in the rectifier unit can be avoided; moreover, the method and the device of the invention have the advantages of simple operation and convenient assembly, and can prolong the service life of the aluminum electrolyte bath and reduce the loss caused by the powering-off and the shut-down of the aluminum electrolyte bath.

Description

technical field [0001] The invention relates to a short-circuit power failure, slotting method and device for an aluminum electrolytic cell without power failure in the series of aluminum electrolysis, and belongs to the technical field of short-circuit power failure of the aluminum electrolytic cell. Background technique [0002] In the production process of electrolytic aluminum, after a certain number of years, the aluminum electrolytic cell needs to be stopped for overhaul. Before the overhaul, the current on the aluminum electrolytic cell to be overhauled should be converted to the branch circuit of the short circuit block, that is, the short circuit block that was originally open should be closed. Make the current flowing through the aluminum electrolytic cell directly enter the next aluminum electrolytic cell through the short-circuit block circuit, so as to realize the shutdown of the aluminum electrolytic cell. After the overhaul, the aluminum electrolytic cell shou...

AI Technical Summary

Problems solved by technology

In order to pursue economies of scale, today’s aluminum electrolysis series are all developing towards large-scale tanks and series, and the load of the series even reaches the electricity load of a medium-sized city. Such a large load change is very unfavorable to the operation of the power grid

[0004] (2) Affecting aluminum electrolytic cell series rectifier units

In order to overhaul the shutdown operation, frequent power failure and power-on will inevitably affect the life of the rectifier unit

[0005] (3) Affect the production management of aluminum electrolytic cell

The opening and closing operation time of the short-circuit block is generally 15 to 30 minutes. During the operation, the whole series of aluminum electrolytic cells have no energy income, and the cell conditions fluctuate after power-on, which brings certain difficulties to production management.

In addition, frequent current shocks and thermal shocks will greatly affect the life of the aluminum electrolytic cell lining, shorten the life cycle of the inner lining, and even cause leakage accidents in the sick cells of the aluminum electrolytic cell series

[0006] (4) Affecting the economic indicators of aluminum electrolytic cell series

The impact on production costs mainly includes three aspects: the life loss of the lining of the aluminum electrolytic cell; the energy loss of the fluctuation of the cell condition; the life loss of the rectifier unit

Images