UA30565U - Blowing unit - Google Patents

Abstract

A blowing unit contains a socket block, a blowing tuyere. It also contains a supply system of argon, which consists of a set of bent tubes with diameter of opening of 3-12 mm, which are ended by thin slots or bars, slots and bars simultaneously with capillary openings, a check valve and a thick pipe.

Description

Description of the invention

A useful model belongs to ferrous metallurgy, namely, to the bottom blowing of metal, and can be used 2 for out-of-furnace processing of metal with inert gases in a steel ladle.

A device is known that contains a socket block, a blow nozzle placed in a metal sleeve, a gas supply tube and a protective plug installed under the blow nozzle. A protective block is coaxially placed under the socket block, resting on the bucket casing through the leveling layer. A protective plug is installed in the protective block. A safety valve is installed under the plug support on the gas supply tube. The safety valve includes a body 70 with a central vertical gas supply channel consisting of upper and lower parts. A diaphragm with channels connecting the cavities of the upper and lower parts is installed between them. On the inner surface of the lower part, which is adjacent to the gas supply channel, a conical annular protrusion is made, which turns into an annular horizontal plane. The diaphragm is installed with a gap relative to the protrusion, and a copper alloy insert is placed in the upper part of the case. In case of wear or burnout of the lance, the metal entering under the 12 lance is prevented from pouring out of the ladle by a protective plug (KO Mo2180279, B220 41/58, 20011.

In the process of operation of the specified blowing unit, the nozzle may burn out due to insufficient purity of argon, or insufficient resistance of the refractory, or an environment that is aggressive to the refractory of the nozzle, as a result of which uncontrolled leakage of metal may occur through the vertical gas tube outside the ladle, destroying the safety valve and the tube that could lead to a major accident. 20 The useful model is based on the task of increasing the reliability of the blowdown unit by providing protection against accidental leakage of metal.

The task is solved by the fact that the blowing unit, which includes a nesting unit, a blowing nozzle, according to a useful model, contains an argon supply system, which consists of a number of bent tubes with an opening diameter of 3-12 mm, which end in thin slits, or bars, or slits and bars at the same time with capillary 29 holes, non-return valve and thick pipe. -

The number of bent tubes is 4-12.

It is better if the diameter of the hole of the bent tube is 6 mm.

During out-of-furnace processing (bringing the metal to a defined composition), the ladle with molten metal (steel) is always blown with inert gases and the necessary reagents are introduced. This achieves the maximum averaging of the chemical composition of the liquid metal (steel) over the entire volume of the ladle (the height of the ladle can be more than 30 meters, and its capacity can be up to 400 tons).

To blow such a quantity of metal, it is necessary to supply inert gas at high pressure to the lower part of the ladle, which, rising up, creates turbulence and mixing of all layers from bottom to top. At the same time, the temperature of the metal (steel), which is more than 15502, destroys the blowing nozzle after disconnection

From the supply of inert gas. at

To prevent accidents and to maximize the life of the blow nozzle, this design is proposed, in which, in the event of a burnout of the blowdown nozzle, the metal has no possibility of uncontrolled exit from the outside of the bucket due to the fact that even after the burnout of the refractory component below, there is a labyrinth lock made of bent tubes with with a hole diameter of 3-12 mm, ending with thin 70 slits, or bars, or slits and bars at the same time with capillary holes for the exit of argon into the metal layer with c) final pressure provided with a non-return valve. Bent thin tubes increase distance and time

From" the passage of metal during its emergency outflow, which is sufficient to cool and stop the outflow of metal. The non-return valve effectively prevents the penetration of metal into the purging channels at the end of argon purging, ensuring its stable operation.

A useful model is explained with drawings. Fig. 1 shows the blowing block in section; o in Fig. 2 - the construction of flexible tubes; o in Fig. 3 - slits and bars, top view.

The blowing unit contains a nesting unit 1, a blowing nozzle 2, an air chamber C and a mechanical circuit o consisting of bent tubes 4 with a hole diameter from C to 12 mm (better bmm), which end in thin

Ge 50 by slits 5, or bars, or slits and bars at the same time with capillary openings for the release of inert gas into the metal layer, non-return valve 6 and thick pipe 7. The number of bent tubes can be from 4 to 12. The blowdown unit functions as follows.

An inert gas is supplied to the thick pipe 7, for example, argon, which passes through the non-return valve 6 along the bent tubes 4 into the air chamber 3, which stabilizes the pressure and supplies the inert gas to the thin slits 5 and/or bars 99 to the blow nozzle 2, after which it falls into a layer of molten metal. with

Claims (3)

Formula of the invention 60 1. Blowing unit containing a nesting unit, a blowing nozzle, which differs in that it contains an argon supply system, which consists of a number of bent tubes with an opening diameter of 3-12 mm, which end in thin slits or bars, or slits and bars at the same time with capillary holes, non-return valve and thick pipe. 2. Blowing unit according to claim 1, which differs in that the number of bent tubes is 4-12. for 3. Blowing block according to claim 1, which is characterized by the fact that the diameter of the opening of the bent tube is 6 mm.