SU901367A1 - Device for combusting anode gases of aluminium electrolizer - Google Patents

Description

(5) DEVICE FOR BURNING ANODUS GASES OF ALUMINUM ELECTROLYZER

I

The invention relates to the manufacture of metals by electrolysis and can be used in the production of aluminum in electrolytic cells with self-baking anodes.

A device for burning anode gases, made in the form of a burner mounted on a tide of a gas collecting bell and a system of gas ducts 1, is known.

A feature of the device is that the burner slots are made tapering upward, and in the high tide of the gas collection bell there is an opening for air leaks. The duct system is telescopically connected and made in the form of a free-lying washer on the end of a large-diameter pipe, and a pipe is passed through the opening of the washer to discharge the gas. Such a connection makes it possible to compensate for the displacement of the anode in the horizontal and vertical plane.

The closest to the proposed technical essence and the achieved effect is a device for burning the anode gases of an aluminum electrolyzer, comprising a gas flue pipe, a pipe installed inside the pipe and equipped with a throttle valve for controlling the amount of air f2 that is drawn into the combustion chamber.

ten

The disadvantage of this device is the complexity of the design, insufficient combustion of gases due to the fact that the gases

15, from one device to another, is cooled, and in addition, the replacement of burnt nozzles is a laborious operation, as the nozzle in the device is rigidly connected to the gas duct.

20

The purpose of the invention is to provide more complete combustion of anode gases, simplifying the design and operating it.

The goal is achieved by the fact that in the device for burning anode gases of an aluminum electrolysis cell, including a gas flow pipe, a throttle valve and a pipe installed inside the pipe, the pipe is freely suspended inside the pipe, made with a break, on the fastening elements.

FIG. 1 shows the proposed device, a general view in section (cut BB on Fig. 27; Fig. 2 - section A-A in Fig. 1).

Pipe 1 is freely suspended inside the top pipe 2 on fastening elements 3 by means of projections k. The lower end of the nozzle is passed into the pipe 5 through the throttle valve, made in the form of two washers 6 and 7 freely lying on the pipe 5 and having openings 8 for the passage of air. The pipe 5 is installed on the corner section 9 of the gas collection bell. The size of the protrusions k is somewhat smaller than the size of the groove 10 between the fastening elements 3 and ensures the free passage of the protrusions through the slots. The throttle valve has handles 11. The upper pipe 2 is fixed on the duct 12. In the device there are hatches 13 for cleaning. Pipe 1 can be made of refractory material, for example, of cast stone.

The device works as follows.

The air 5 passes through the orifices 8 of the throttle valve, enters the space between the nozzle 1 and the pipe 5 and in a heated form mixes with the gas coming from the corner section 9 in the combustion chamber. Another suit of gas is burned in the upper tube as a result of mixing the gas with air entering through the slots 10. Thus, the combustion of gas occurs in two zones: in the lower and in the upper. Regulation of the intensity of gas combustion in both zones is provided by throttle valves; at the bottom.

zone by mutual movement of the washers 6 and 7 and at the top - by turning the nozzle 1 around the vertical axis.

To replace the nozzle it is enough to turn it up to align the protrusions.

grooved, lower and remove.

The proposed design allows for more complete combustion of anode gases, as well as simplifies the design and operation of the replacement pipe.

Claims (2)

1. USSR Author's Certificate No. 378526, cl. With 25 SZ / Yu, 1973. 2. USSR author's certificate for application number 2721991, cl. C 25 C 3/22, 1979 "G t