JP6333625B2 - Injection lance device - Google Patents

Description

In the present invention, for example, in order to perform desiliconization and deoxidation of molten iron in the toppe in the hot metal preliminary treatment, oxygen, iron oxide, and fuel gas such as propane gas (LPG) used for cooling the pipe are used for the molten iron. The present invention relates to an injection lance device adapted to flow.

Patent Document 1 discloses an injection lance having a double-pipe structure having an inner pipe immersed in a weld metal and blown with a carrier gas by a carrier gas, and an outer pipe that is coaxial with the inner pipe and blows cooling gas. A device has been proposed.
As shown in FIG. 4, this injection lance device 60 has a lance 61 and a lance holder 62, and the lance 61 and the lance holder 62 are connected via a pair of flanges 63 and 64, and a double pipe. First and second fuel pipes 68 and 69 (also referred to as LPG pipes) connected by auxiliary flanges 66 and 67 are connected to the outside of the lance 61 having the structure, and LPG that also acts as a cooling gas is supplied. ing.

JP 7-242926 A

However, since the injection lance device 60 operates with the LPG piping (that is, the auxiliary flanges 66 and 67 and the first and second fuel pipes 68 and 69) exposed, splash or the like adheres during the operation, When replacing the lance 61 due to seizure of a socket, a screw or the like, it took a lot of time to attach and remove the LPG pipe.
Further, in the above LPG pipe, there is a case where a metal is attached to the LPG pipe and becomes high temperature, and there is a problem that a waiting time until cooling is required before the work is performed and workability is poor.
Further, the LPG pipe may be bent somewhat, and in this case, it is necessary to correct the pipe before mounting.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an injection lance device capable of replacing the lance in a short time, having good workability, and ensuring the mounting accuracy.

An injection lance device according to the present invention that meets the above object has a lance and a lance holder connected by a pair of flanges, and the lance is a double pipe and is arranged outside the lance and the lance holder. In an injection lance device in which a cooling fuel gas is supplied to the lance through first and second fuel pipes connected to each other,
A through hole forming the connection portion of the second fuel pipe and the first fuel pipe is formed respectively on the outer region of the flange forming the pair, the other side of the through hole formed in one of said flanges A convex tube portion is formed, and a concave tube portion into which the convex tube portion is fitted is formed on one side of the through hole formed in the other flange, and the first fuel tube on the lance side and the A reinforcing rib for supporting the first fuel pipe is provided between the outer pipe of the lance . Here, there is LPG as the cooling fuel gas, but other gas may be used.

In the injection lance device according to the present invention, it is preferable that each of the flanges has a connection portion of the first and second fuel pipes branched into a plurality. In this case, the first and second fuel pipes may be branched from the middle with a single pipe to the middle.

In the injection lance device according to the present invention, it is preferable that the connection portion is provided on the same circumference as the plurality of screw holes of the pair of flanges, and is provided at the center of the adjacent screw holes.

In the injection lance device according to the present invention, since the connection portion of the first fuel pipe and the second fuel pipe is formed in the outer region of the paired flange, when the flange connecting the lance and the lance holder is separated, The first and second fuel pipes are also disconnected. Therefore, there is no need to provide separate flanges for connecting the first and second fuel pipes, and the lance replacement operation can be performed quickly and easily.

In the injection lance device according to the present invention, when the flange has a connecting portion of the first and second fuel pipes branched into a plurality, the first and second fuel pipes are made smaller diameter pipes. Thus, the outer region of the flange can be used more effectively while securing the cross-sectional areas of the first and second fuel pipes.

Injection lance apparatus according to the present invention, a connection portion protruding pipe portion formed on one of the flanges, are formed on the other flange, so and a凹管portion protruding pipe section is fitted, the positional accuracy of the flange More accurate can be secured.

In the injection lance device according to the present invention, when the connecting portion is provided on the same circumference as the plurality of screw holes of the pair of flanges and provided at the center of the adjacent screw holes, the connecting portion is provided in the outer region of the flange. The first and second fuel pipes can be connected using the effective portion.

The injection lance apparatus according to the present invention, since the reinforcing ribs are provided between the first fuel pipe and the lance outer tube of the lance side, the mounting strength of the first fuel pipe is increased.

It is sectional drawing which shows the principal part of the injection lance apparatus which concerns on one embodiment of this invention. It is a whole sectional view of the injection lance device. (A) is an AA arrow view in FIG. 1, (B) is a BB arrow view in FIG. It is a schematic explanatory drawing of the injection lance apparatus which concerns on a prior art example.

As shown in FIGS. 1, 2, 3 (A) and 3 (B), an injection lance device 10 according to an embodiment of the present invention includes a lance 13 and a lance connected by a pair of flanges 11 and 12. A holder 14 is provided. The lance 13 is a double tube having an outer tube 16 and an inner tube 17 arranged concentrically, and forms a nozzle 18 that bends at the front side and gradually decreases in diameter toward the front side. .

A gap C is formed between the outer pipe 16 and the inner pipe 17 of the lance 13, and LPG, which is an example of a cooling fuel gas, is supplied to the gap C. The LPG is supplied from the outside through first and second fuel pipes 20 and 21 which are arranged outside and connected to the lance 13 and the lance holder 14. As shown in FIG. 3B, the first fuel pipe 20 uses two downstream narrow pipes (for example, 20A pipes) 22 and 23, and the second fuel pipe 21 has a medium diameter pipe (for example, upstream) , 32A piping), upstream tubules 24 and 25 are used on the downstream side.

The outer tube 16 includes a thick tube 26 having a thickness, a reducer 27, and a thin tube 28. The reducer 27 connects the large-diameter thick tube 26 and the small-diameter thin tube 28 together. The thick tube 26 and the flange 11 are connected by two downstream narrow tubes 22 and 23. LPG is supplied to the downstream narrow tubes 22, 23, the lance 13 is cooled, discharged from the nozzle 18 and burned.
In this embodiment, the outer tube 16 has a reinforcing tube 16 a on the inner side, and a gap C is formed between the reinforcing tube 16 a and the inner tube 17. The reinforcing pipe 16a reinforces the entire outer pipe 16, and extends through the thick pipe 26 and the reducer 27 to the upstream end. A space portion S is formed between the thick tube 26 and the reducer 27 and the reinforcing tube 16a, and LPG flows through this portion to cool the periphery of the space portion S. Further, it is preferable that a through-hole that allows LPG to flow into the gap C is formed in the reinforcing pipe 16 a on the downstream side of the reducer 27 and the upstream side of the thick-walled pipe 26.

A thick tube 26 is welded to the flange 11 on the downstream side, and a plurality of reinforcing ribs 30 are provided on the thick tube 26 and the flange 11 so that the lance 13 and the flange 11 are connected with sufficient strength. It has come to be. Further, reinforcing ribs 31 are also provided between the downstream narrow tubes 22 and 23 and the thick tube 26 for the same purpose as the reinforcing ribs 30. The outer tube 35 and the flange 12 of the lance holder 14 are reinforced by a plurality of reinforcing ribs 35a, and the outer tube 35 and the upstream narrow tubes 24 and 25 are reinforced by reinforcing ribs 35b.

A plurality of (8 in this embodiment) screw holes 33 are formed in the flanges 11 and 12, and the paired flanges 11 and 12 can be connected by a bolt 34 passing therethrough and a nut 34a screwed into the bolt 34.
Like the known lance holder, the lance holder 14 has an outer tube 35 and an inner tube 36, and further has a powder supply tube 37 inside the inner tube 36. Cooling water flows in the gap between the outer pipe 35 and the inner pipe 36, and a cooling water circulation path is formed between the cooling pipe 38 and the cooling pipe 38. From the powder supply pipe 37, necessary powder is supplied by oxygen and sent to the lance 13.

As described above, the lower ends of the upstream tubules 24 and 25 through which LPG flows are connected to the upstream side of the flange 12, and the upstream ends of the downstream tubules 22 and 23 are connected to the downstream side of the flange 11. The through holes 39 and 40 are formed in the outer regions of the flanges 12 and 11. Here, the through holes 39 and 40 form connection portions of the first and second fuel pipes 20 and 21. A convex tube portion 41 is formed on the downstream side of the through hole 39 formed in the flange 12, and a concave tube portion 42 is formed on the upstream side of the through hole 40 formed in the flange 11. The portion 42 has a stamping structure to increase the positioning and mounting strength of the flanges 11 and 12.

The through holes 39 and 40 are on the same circumference as the screw holes 33 and are formed at the center positions of the adjacent screw holes 33. As a result, the adjacent screw holes 33 are fastened by the bolts 34 and nuts 34 a that pass through the screw holes 33, and are further connected to the through holes 39 and 40, the downstream narrow tubes 22 and 23, the upstream narrow tubes 24 and 25, and the bolts 34. And the nut 34a does not interfere.

The lance holder 14 is provided with an annular water supply pipe 44 on the downstream side, and the water supply pipe 44 is provided with a plurality of water nozzles 45, and if necessary, the structure around the flanges 11 and 12 is cooled. ing.
The contact portions of the flanges 11 and 12 are flat, and are fixed with a packing having the same shape as the flanges 11 and 12 sandwiched therebetween.

Therefore, when this injection lance device 10 is used, the lance 13 is connected to the lance holder 14 prepared in advance via the flanges 11 and 12. At that time, the upstream side narrow tubes 24 and 25 and the downstream side narrow tube 22 are connected. , 23 are connected via the flanges 11 and 12, so that LPG flows from the second fuel pipe 21 to the first fuel pipe 20 without any trouble, and is discharged from the nozzle 18 through the outside of the lance 13.

When the lance 13 is replaced, the first and second fuel pipes 20 and 21 are also separated by removing the flanges 11 and 12, so that it is not necessary to remove the auxiliary flange independently as in the prior art. The attachment of the lance 13 is extremely easy. In FIG. 2, the lance holder 14 has a well-known structure and is mounted on a carriage, and can move up and down, change the tilt angle, and move in the length direction.

The present invention is not limited to the embodiment described above, and the dimensions and shape can be changed without changing the gist of the present invention.

10: Injection lance device, 11, 12: Flange, 13: Lance, 14: Lance holder, 16: Outer pipe, 16a: Reinforcement pipe, 17: Inner pipe, 18: Nozzle, 20: First fuel pipe, 21: Second fuel pipe, 22, 23: downstream narrow pipe, 24, 25: upstream narrow pipe, 26: thick pipe, 27: reducer, 28: thin pipe, 30, 31: reinforcing rib, 33: screw hole, 34: bolt, 34a: nut, 35: outer pipe, 35a, 35b: reinforcing rib, 36: inner pipe, 37: powder supply pipe, 38: cooling pipe, 39, 40: through hole, 41: convex pipe section , 42: concave tube portion, 44: water supply tube, 45: water nozzle

Claims (3)

A lance and a lance holder connected by a pair of flanges, wherein the lance is a double pipe, and the first and second fuel pipes are arranged and connected outside the lance and the lance holder. Via an injection lance device in which a cooling fuel gas is supplied to the lance,
A through hole forming the connection portion of the second fuel pipe and the first fuel pipe is formed respectively on the outer region of the flange forming the pair, the other side of the through hole formed in one of said flanges A convex tube portion is formed, and a concave tube portion into which the convex tube portion is fitted is formed on one side of the through hole formed in the other flange, and the first fuel tube on the lance side and the An injection lance device, wherein a reinforcing rib for supporting the first fuel pipe is provided between the outer pipe of the lance. 2. The injection lance device according to claim 1, wherein each of the flanges has a connecting portion of the first and second fuel pipes branched into a plurality. 3. The injection lance device according to claim 1, wherein the connection portion is on the same circumference as the plurality of screw holes of the pair of flanges, and is provided at the center of the adjacent screw holes. A featured injection lance device.

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