JPH0417560Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a powder blowing device for blowing powder such as smoke ash through the tuyere of a converter for non-ferrous metal smelting such as copper smelting. .

[Conventional technology]

A conventional blower device for blowing powder into a converter for non-ferrous smelting uses a shell 1 on the furnace wall of the converter as shown in Fig. 3.
A reinforcing metal fitting 4 is attached to the outer periphery of the tuyere pipe 3 protruding to the outside of the shell 1 by welding to the shell 1. Tuyere box 5
is installed. A punching port 6 is provided in the tuyere box 5 in direct line with the tuyere pipe 3, and a metal ball 7 is placed inside the punching port 6 to normally close the punching port 6 due to its own weight. When the punching rod is pushed into the tuyere pipe 3, it escapes diagonally backward and upward along the path of the metal ball formed to be inclined backward and upward, and the punching rod can be inserted into the tuyere pipe 3. The tuyere box 5 is also provided with an upper opening 8 that communicates with the tuyere pipe 3.
One end of the blower branch pipe 9 is connected to. A main air pipe 10 is connected to the other end of the air branch pipe 9 in communication.

In a converter for non-ferrous smelting, more than ten tuyeres configured as described above are installed branching off from one main blowing pipe 10, and among them, the tuyeres for blowing powder such as smoke ash are installed. A powder blowing pipe 11 is connected diagonally toward the tuyere box 5 in the middle of the blowing branch pipe 9, and is connected to a powder feeding device (not shown).

The reaction air supplied into the converter is supplied through the main blower pipe 10.
From there, it passes through the blower branch pipe 9, the inside of the tuyere box 5, and reaches the tuyere pipe 3, where it is blown into the converter as shown at A and B. When feeding powder into the converter,
The powder flowed from the powder conveying device to the powder blowing pipe 11 together with air having a higher air pressure than the air pressure from the main blowing pipe 10 is combined with the air from the main blowing pipe 10 in the blowing branch pipe 9 to form a converter. blown inside.

When the operation continues as described above while blowing air and blowing powder, the tuyere pipe 3
A cylindrical solidified substance (pine room) is located at the tip inside the furnace.
grows and ventilation resistance increases.
If you try to remove the pine room by inserting a punching rod into the tuyere pipe 3 through the punching port 6, powder will blow out from the punching port 6 and the punching operation will not be possible. 9 rises higher than the internal pressure of the main blower pipe 10, the powder enters the main blower pipe 10 as shown by arrow C, and the powder enters the tuyere box 5 of the tuyere where no powder is being blown. When the tuyere is punched, a large amount of it is ejected outside the punching port, significantly worsening the working environment.

In order to solve this problem, a damper is provided from the connection part of the powder blowing pipe 11 to the blower branch pipe 9 to the blower main pipe 10 side, and the damper is used to prevent the backflow from occurring when powder is supplied to the blower branch pipe 9. It is conceivable to cut off the middle of the However, when the blower branch pipe 9 was shut off by the damper, the powder blowing pipe 11
If the airflow becomes clogged or the wind pressure decreases,
There is a problem in that the pressure inside the tuyere box 5 decreases and the molten metal in the converter enters into the tuyere box 5 through the tuyere pipe 3.

[The problem that the idea aims to solve]

The present invention can prevent backflow toward the main air blowing pipe 10, which causes powder to leak from the punching port 6, and prevents the powder blowing pipe 11 from becoming clogged for some reason or reducing its wind pressure. It is an object of the present invention to provide a blower device for blowing powder in a converter for non-ferrous smelting, which prevents molten metal from entering the tuyere box 5 even in the case of a non-ferrous smelting converter.

[Means to solve the problem]

The means for solving the problems of the present invention is to provide a non-return check that prevents backflow to the main air pipe side from the powder blowing pipe connection part of the air branch pipe in the powder blowing device described above. This is due to the provision of a valve.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

In FIG. 1, the configurations of the shell 1, lining 2, tuyere pipe 3, reinforcing metal fittings 4, tuyere box 5, punching port 6, metal ball 7, and powder blow-off pipe 11 are the same as in FIG. 3. . On the side of the main air pipe 10 from the connection part of the air branch pipe 9 with the powder blowing pipe 11,
A check valve 12 is inserted. The check valve 12 allows air from the main air pipe 10 to pass through to the tuyere box 5 side, but a valve plate 21 is provided to prevent air from flowing from the tuyere box 5 side to the main air pipe 10.

FIG. 2 is an enlarged sectional view of the check valve 12 of FIG. 1. The check valve 12 includes a casing 13 made of a square tube with both ends open, a valve seat pipe 14 having the same diameter as the blower branch pipe 9 and integrally provided through one side of the casing 13, and a valve seat pipe 14. On the other side of the casing 13 opposite to the provided one side, there is a nozzle pipe 16 communicating with the inside of the casing 13 and having the same diameter as the blower branch pipe 9 provided facing the valve seat pipe 14, and a nozzle pipe 16 around the openings at both ends. An inspection lid 18 is attached to the provided flange 20 with bolts 24 via a gasket 19 so as to close the opening, and an inspection lid 18 is provided perpendicularly to the valve seat pipe 14 on the side surface of the protruding end of the valve seat pipe 14 into the casing 13. Valve stem 2
2, a valve plate 21 rotatably attached to the valve shaft 22 so as to close the end face inside the casing 13 of the valve seat pipe 14; and a torsion coil spring 23 whose other end is in contact with the valve plate 21 and wound around the valve shaft 22. Note that the end surface of the valve seat pipe 14 in contact with the valve plate 21 inside the casing 13 is not perpendicular to the center line of the valve seat pipe 14, but is aligned with the valve shaft 22.
5° to a plane perpendicular to the center line of the valve seat pipe 14 so that the side farthest from the valve seat protrudes into the casing 13.
It is tilted at an angle θ of 45°, so that when the air pushes open the valve plate 21 and flows toward the tuyere box 5, the valve plate 21 faces toward the nozzle pipe 16 as much as possible, so that no resistance is created to the flowing air. It is preferable to do so. Further, the valve plate 21 is made of a thin plate made of a light material such as aluminum, and the strength of the torsion coil spring 23 is adjusted so that no external force acts on the valve plate 21.
It is preferable that it lightly touch the end face of the valve seat pipe 14. This check valve 12 is installed in the middle of the blower branch pipe 9 by means of flanges 15 and 17 formed on the outer periphery of the outer end of the casing 13 of the valve seat pipe 14 and the nozzle pipe 16. .

[Effect]

When a valve (not shown) that supplies powder to the powder blowing pipe 11 is closed and only normal air blowing without blowing powder is performed, the air blowing from the main blowing pipe 10 to the tuyere box 5 side is The valve plate 21 is pushed open by the wind pressure, and air flows from arrow A to direction B, and air is blown into the converter. When powder is blown in together with flowing air from the powder blowing pipe 11, as long as no pine room has grown at the end of the tuyere pipe 3 in the furnace and there is no blowing resistance due to the pine room, air is blown from the main air blowing pipe 10, The powder from the powder blowing pipe 11 and its flowing air are combined at the blowing branch pipe 9 and blown into the furnace. As the pine room gradually grows and the resistance to blowing increases, the air pressure from the check valve 12 to the tuyere box 5 side becomes higher than the pressure inside the main blowing pipe 10. The body and its flow air begin to flow towards the blast main pipe 10. If the valve plate 21 is made to be able to move easily as described above, when the air starts to flow from the powder blowing pipe 11 to the main blowing pipe 10, the valve plate 21 will be moved against the end face of the valve seat pipe 14. This prevents the powder and its flowing air from entering into the main air pipe 10. If the flow of powder from the powder blowing pipe 11 is stopped or the powder blowing pipe 11 is clogged for some reason, and the air pressure on the tuyere box 5 side is lower than that on the main blowing pipe 10 side, the main blowing pipe The valve plate 21 is opened by the wind pressure directed from the tuyere box 10 toward the tuyere box 5 side, and the air pressure in the tuyere box 5 is maintained at an appropriate blowing pressure to prevent molten metal from entering the tuyere box 5 from inside the furnace. I can do it.

[Effect of idea]

According to the present invention, backflow of powder to the main blower pipe,
It is possible to provide a powder blowing device that prevents molten metal from entering into a tuyere box.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of a blower device for blowing powder in a converter for non-ferrous smelting according to the present invention, and Fig.
FIG. 3 is an enlarged cross-sectional view of the check valve shown in the figure, and FIG. 3 is a cross-sectional view of a conventional device. 1... Shell, 2... Lining, 3... Tuyere pipe, 4... Reinforcement fittings, 5... Tuyere box,
6...Punching mouth, 7...Metal ball, 8...
...Top opening, 9...Blower branch pipe, 10...Blower main pipe, 11...Powder blowing pipe, 12...Check valve, 13
... Casing, 14 ... Valve seat pipe, 15 ... Flange, 16 ... Nozzle pipe, 17 ... Flange, 1
8...Inspection lid, 19...Packskin, 20...Flange, 21...Valve plate, 22...Valve stem, 23...Torsion coil spring, 24...Bolt.

Claims (1)

[Scope of utility model registration request] A tuyere pipe that penetrates the shell and lining of the furnace wall of a converter for nonferrous smelting, and a punching port that is installed directly on the outside of the furnace wall of this tuyere pipe, and a hole inside the punching port that can open and close the punching port. A tuyere box having a metal ball provided therein, an upper opening communicating with the tuyere pipe, a blower branch pipe provided with one end communicating with the upper opening of the tuyere box, and a blower branch pipe communicating with the other end of the blower branch pipe. In a blower device having a main air pipe installed as a main air blower pipe and a powder blowing pipe installed in the middle of the air blower branch pipe, the air blower main pipe side is provided closer to the main air pipe side than the powder blowing pipe connection part of the air blower branch pipe. A blower device for blowing powder into a converter for nonferrous smelting, which is equipped with a check valve to prevent backflow.