SU1388463A1 - Cover of electrolyzer for producing aluminium - Google Patents

Abstract

This invention relates to the field of non-ferrous metallurgy, in particular, to the production of aluminum by electrolysis of cryolite-alumina melts in electrolyzers of all types. The aim of the invention is to improve working conditions by increasing tightness. The cover of the electrolyzer for producing aluminum contains horizontal platforms 11, inclined shutters 12, closed hollow elements 15 with openings 16. The invention reduces the capital and operating costs of capturing, transporting and cleaning electrolytic gases. 3 il.

Description

3

(L

with

00 00

0: with

fig.g

The invention relates to non-ferrous metallurgy, in particular, to the production of aluminum by the electrolysis of cryolite-alumina melts in electrolyzers of all types equipped with shelters for trapping electrolysis gases emitted from aluminum electrolyzers.

water 8 and the air line 9 is injected into closed hollow elements 15 of horizontal pads 11, from which it is distributed through nozzles 17 and openings 18 into closed hollow elements of inclined folds 12. Air enters through openings 16 into openings of horizontal pads,

The purpose of the invention is to improve the anode rods improved for passage.

VIY labor by increasing the tightness of shelters.

Figure 1 shows a general view of an electrolysis cell cover dp for producing aluminum; Fig. 2 is a detailed diagram of the airtight sealing of the gaps between the cover elements; in FIG. 3, view A in FIG. 2.

The cover of the electrolysis cell to produce aluminum contains an anode device 1 with a gas collector 2, a cathode device 3 with closed cavities 4 in the sides and 5 in the bottom, the discharge air line

15

into the gaps between the upper edges of the valves and the outer longitudinal edges of the horizontal platforms and into the gaps at the joints of the side edges of the valves with each other.

Thus, during the interoperative period, the operation of the electrolyzer in all the openings for the rods and the gaps in the shelter is supplied from two sides to each other by jets of air, as a result of which an air sealing of the leaks in the shelter is ensured. During the opening of the working openings, the air seal creates 6 with the fan 7 pressurization, pipe-25 due to the supply of: air through

thirty

35

40

water 8, air line 9, shelter 10, consisting of a horizontal area 11 and inclined valves 12, closing the working openings on the longitudinal sides of the electrolyzer, a gas duct, a gas extractor system 13 with a heat exchanger 14. In the outer walls of the horizontal platform 11 and doors 12 and openings in the horizontal platform, closed to the passage of the anode rods are made closed hollow elements 15 with openings 16. The outer walls of the horizontal platform 11 are provided with air distributing nozzles 17, in the inner walls of the shutters 12 there are openings 18 for move nozzle 17 in the cavity of the valves.

The device works as follows.

By fan 7, air is supplied through discharge pipe 6 into cavity 4, and then into cavity 5 connected to them. Circulation of air in these cavities results in the redistribution of heat between the sides and the bottom of the cathode device 3, as a result of which the energy mode of the electrolyzer is stabilized. The fan 7, the discharge air line 6, the cavities 4 in the sides and 5 in the bottom of the cathode device are part of the power technological installation. Exhaust heated air by pipe 45

50

holes 16 and nozzles 17, located at the edges of horizontal planes, joints 11. Due to the vacuum created in the volume of the cover by the suction system, all the air used for air sealing and the air drawn from the body through the leaks in the shelter and working openings After mixing with contaminated and heated electrolysis gases, it enters the gas collector 2 and from it through the exhaust gas duct 13 through the heat exchanger 14 is sent for cleaning. In the heat exchanger 14, the heat of the exhaust gas-air mixture is used to heat water, which is then supplied to household needs.

In order to ensure the required gas recovery efficiency, it is necessary to suck out almost two times less air-gas mixture from the shelter than from the shelter without air compaction of looseness and working openings. As a result, the dimensions of the gas collectors of the shelters, the cross-sectional area of the gas ducts and long pipes, the power of the gas cleaning plants and the production of the regenerated fluorine salts are reduced accordingly. The technical and economic effect of the application is significantly increased when using the air of an energy technology installation and the heat of the suction gas mixture.

five

into the gaps between the upper edges of the valves and the outer longitudinal edges of the horizontal platforms and into the gaps at the joints of the side edges of the valves with each other.

Thus, during the interoperative period, the operation of the electrolyzer in all openings for the rods and gaps in the shelter is carried out from two sides towards each other of the air jets, as a result of which an air sealing of the leaks in the shelter is ensured. When opening the openings, the air seal creates

five

0

five

0

holes 16 and nozzles 17, located at the edges of horizontal planes, joints 11. Due to the vacuum created in the volume of the cover by the suction system, all the air used for air sealing and the air drawn from the body through the leaks in the shelter and working openings After mixing with contaminated and heated electrolysis gases, it enters the gas collector 2 and from it through the exhaust gas duct 13 through the heat exchanger 14 is sent for cleaning. In the heat exchanger 14, the heat of the exhaust gas-air mixture is used to heat water, which is then supplied to household needs.

In order to ensure the required gas recovery efficiency, it is necessary to suck out almost two times less air-gas mixture from the shelter than from the shelter without air compaction of looseness and working openings. As a result, the dimensions of the gas collectors of the shelters, the cross-sectional area of the gas ducts and long pipes, the power of the gas cleaning plants and the production of the regenerated fluorine salts are reduced accordingly. The technical and economic effect of the application is significantly increased when using the air of an energy technology installation and the heat of the suction gas mixture.

Claims (1)

Claims of an electrolytic cell for producing aluminum, comprising horizontal platforms with openings for the passage of anode rods located in the upper part, removable flaps located laterally and supported by the upper sides on horizontal platforms, characterized in that, in order to improve conditions labor by increasing the tightness, it is provided with closed hollow elements {located along the perimeter of the project-IMOB in horizontal platforms and around the perimeter of removable flaps, filled with openings located on the walls facing the anode rods and adjacent shutters; elements of horizontal platforms and removable shutters. Phie. / ViaA  oh oh "L "" E "" - "FIG. 3