JPH11304372A - Non-consumed water cooled lance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly perform a work and improve a fusion and melting efficiency without generating a dislocation between the heating part of a metal material by a fuel jet pipe and the blowing part of oxygen in the operation of a metal material melting furnace for carrying out the early heating, fusion and melting of a suitable metal material. SOLUTION: A non-consumed water cooled lance is used for fusing, melting and refining a suitable metal material as a material in an electric furnace or other metal furnaces. The lance comprises an oxygen blow pipe A for blowing oxygen or gas including oxygen and a powder blowing pipe B for blowing carbon powder or lime powder or the like. In this case, a holder D is attached to the oxygen blowing pipe A and a fuel-jet pipe C for suitably blowing fuel is attached to the oxygen blowing pipe A through the holder D.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention mainly relates to an electric furnace,
The present invention relates to a non-consumable water-cooling lance used for melting, melting, refining, etc. of a metal material as a raw material in other metal melting furnaces.

[0002]

2. Description of the Related Art Conventionally, a non-consumable water-cooling lance used for melting, melting, refining, etc. of an appropriate metal material as a raw material in an electric furnace and other metal melting furnaces has been proposed.
For example, an oxygen lance for blowing oxygen and a powder lance for blowing powder as appropriate are arranged side by side (for example,
A device for blowing oxygen and powder of an electric furnace as described in JP-A-7-145422). For example, in the operation of a metal raw material melting furnace, if work is to be carried out early, an oxygen burner (liquid) as a melting auxiliary energy is provided around the furnace body of the metal raw material melting furnace or at an operation port (debris opening). An integrated combustion device that burns gas or solid fuel with oxygen is installed separately from the non-consumable water-cooling lance, and the metal material as a raw material is quickly heated and glowed.

[0003]

Therefore, there is a gap between the heating and glowing of the metal material as a raw material by the oxygen burner and the oxygen blowing portion of the non-consumable water-cooled lance. There was a possibility that the quality would be worsened. Also,
In the metal raw material melting furnace, molten metal splash (blow-off) occurs, and the following points must be considered. In other words, the non-consumable water-cooling lance has its tip nozzle part damaged by the splash of molten metal, so that the structure of the tip part is made as simple as possible, manufacturing and maintenance are easy, and the fuel injection port of the fuel injection device is used. May be clogged by splash, and there is a danger of flashback, explosion, etc. due to the non-consumable water-cooling lance inserted into the high-temperature furnace and repeated operation.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to achieve the above-mentioned objects and the like, and has been created so as to provide a device which is easy to handle and has excellent workability. The non-consumable water-cooling lance according to claim 1 is used for melting, melting, refining, etc. of an appropriate metal material as a raw material in an electric furnace or another metal melting furnace. Oxygen injection tube A for injecting the contained gas
And a powder injection pipe B for injecting coal powder or lime powder, etc., which is a non-consumable water-cooled lance, wherein a holder D is mounted on an oxygen injection pipe A, and a fuel injection pipe for appropriately injecting fuel. Means for attaching C to the oxygen blowing pipe A via the holder D was employed.

Further, in the non-consumable water cooling lance of the second aspect, means for detachably attaching the fuel injection pipe C to the oxygen injection pipe A via the holder D is adopted.

Further, in the non-consumable water-cooling lance of claim 3, the fuel injection pipe C is constituted by an outer pipe 1 and an inner pipe 2,
A liquid or gaseous fuel can be appropriately injected from the tip of the inner pipe 2, and compressed air can be injected from between the inner pipe 2 and the outer pipe 1 so as to surround the injected fuel. Means of configuration were adopted.

In the non-consumable water-cooling lance of the fourth aspect, the cooling pipe 7 is provided so as to cover the outer peripheral surface of the outer pipe 1 of the fuel injection pipe C, and the cooling water is circulated in the cooling pipe 7. Means configured to be able to supply are adopted.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated examples. The non-consumable water-cooled lance of the present invention is used for melting, melting, refining, etc. of an appropriate metal material as a raw material in an electric furnace or other metal melting furnace, and includes oxygen or oxygen-containing. It is provided with an oxygen injection pipe A for blowing gas, a powder injection pipe B for blowing coal powder or lime powder, and a fuel injection pipe C for appropriately blowing fuel. Moreover, the fuel injection pipe C is configured to be attached to the oxygen injection pipe A via a holder D attached to the oxygen injection pipe A (see FIG. 1). That is, a liquid or gaseous fuel and compressed air are ejected from the fuel injection pipe C to burn the fuel, and at the same time, oxygen or an oxygen-containing gas is ejected from the oxygen injection pipe A to heat and melt the metal material appropriately. Perform dissolution. Then, when the metal material is appropriately melted (or before melting), charcoal powder or lime powder or the like is blown from the powder blowing pipe B so that refining can be performed.

The non-consumable water cooling lance of the present invention
The holder D is configured so that the fuel injection pipe C can be detachably attached to the oxygen injection pipe A (see FIG. 2). That is, the fuel injection pipe C can be easily removed, its maintenance and the like can be easily performed, and by attaching the holder D to an existing non-consumable water cooling lance, the fuel injection pipe C can be easily attached. It is composed.

Further, in the non-consumable water-cooling lance of the present invention, the fuel injection pipe C has a double pipe structure of the outer pipe 1 and the inner pipe 2, and a liquid or gas is appropriately supplied from the tip of the inner pipe 2. It is configured so that fuel can be injected, and compressed air can be injected from between the inner pipe 2 and the outer pipe 1 so as to surround the injected fuel appropriately (see FIG. 3). That is, the fuel is appropriately mixed with the compressed air and burned.

[0011] In addition, the non-consumable water-cooling lance of the present invention includes:
The cooling pipe 7 is provided so as to cover an outer peripheral surface portion of the outer pipe 1 of the fuel injection pipe C, so that cooling water can be circulated and supplied into the cooling pipe 7 (see FIG. 4). That is, the fuel injection pipe C is configured to be reliably cooled.

The fuel injection pipe C has a fuel supply port 3 at the base end of the inner pipe 2 and a compressed air supply port 4 at the base end of the outer pipe 1.
Is provided, and a fuel injection port 5 is provided at an end of the inner pipe 2,
A compressed air injection port 6 is provided at the tip of the outer tube 1, and the fuel injection port 5 and the compressed air injection port 6 are formed in a nozzle shape, so that the fuel and the compressed air are appropriately mixed. The combustion is promoted. Also, the fuel is surrounded by compressed air,
Consideration has been given to making it difficult for the fuel injection port 5 and the like to be closed by the splash of the molten metal. A fuel or compressed air supply hose is connected to the fuel supply port 3 and the compressed air supply port 4 (not shown).

The holder D is fixed to the oxygen injection pipe A at a predetermined interval by an appropriate means (for example, welding means) so that the fuel injection pipe C can be stably and easily attached and detached. In the illustrated example, for example, the tip of the metal wire is appropriately formed in a ring shape or a hook shape,
The fuel injection pipe C is formed so as to be supported. still,
The holder D having a wavy tip may be formed in an annular shape, and the other holder D may be formed in a hook shape.

The cooling pipe 7 is provided on the fuel injection pipe C, and supplies cooling water from a cooling water inlet 8 provided at the base end and a cooling water outlet 9 provided at the base end. The cooling water is discharged, and the cooling water circulates through the cooling pipe 7 so that the fuel injection pipe C can be cooled. The cooling pipe 7 may be fixed to the fuel injection pipe C, or may be detachably mounted.

Incidentally, the specific configuration, shape and dimensions of the non-consumable water-cooling lance, the specific configuration, shape,
Dimensions, material, specific configuration, shape, dimensions, material, arrangement position of fuel injection tube B, specific configuration, shape, dimensions, material, arrangement position of fuel injection tube B, specific configuration of holder D ,
Shape, size, material, number, arrangement position, specific configuration of outer tube 1, shape, size, material, specific configuration of inner tube 2, shape, size, material, specific configuration of fuel supply port 3, shape , Dimensions, arrangement position, specific configuration, shape, dimensions of the compressed air supply port 4,
Material, arrangement position, specific configuration, shape, size of fuel injection port 5, specific configuration, shape, size of compressed air injection port 6, specific configuration, shape, size, material, cooling water injection of cooling pipe 7 The specific configuration, shape, size, arrangement position of the inlet 8 and the specific configuration, shape, size, arrangement position, etc. of the cooling water discharge port 9 are not limited to those in the illustrated example, but can be freely set as appropriate. You can do it.

The non-consumable water-cooling lance of the present invention is configured as described above. Next, an example of use will be described. First, a combustible material is attached to the tip of a long ignition jig, and a fire is set on this. As a pilot ignition, a liquid or gaseous fuel and compressed air are ejected from the fuel injection pipe C, and the fuel is ignited and burned. Then, oxygen or an oxygen-containing gas is ejected from the oxygen injection pipe A, and the metal material is appropriately heated, melted, and melted. Then, when the metal material is appropriately dissolved (or before the melting), coal powder or lime powder is blown from the powder blowing pipe B to perform refining. At this time, the fuel injection pipe C may be removed from the oxygen injection pipe A for safety.

[0017]

Accordingly, the non-consumable water-cooled lance according to the first aspect is used for cutting, melting, refining, etc. of an appropriate metal material as a raw material in an electric furnace or other metal melting furnace. A non-consumable water-cooling lance comprising an oxygen blowing pipe A for blowing oxygen or an oxygen-containing gas, and a powder blowing pipe B for blowing coal powder or lime powder. A fuel injection pipe C for appropriately injecting fuel is attached to the oxygen injection pipe A via the holder D, so that the fuel injection pipe C quickly heats and melts the appropriate metal material as a raw material. Melting can be carried out, and work can be promptly performed in the operation of the metal raw material melting furnace. In addition, a non-consumable water-cooling lance excellent in fusing and dissolving efficiency can be provided, in which there is no displacement between the heating and red-heating portion of the metal material by the fuel injection tube C and the oxygen blowing portion of the oxygen blowing tube A. Become. In addition, the structure is simple, suitable for mass production, can be provided at low cost, hardly break down, easy to maintain, and easy to handle. That is, in an electric furnace and other metal melting furnaces, it becomes the most suitable as a non-consumable water-cooling lance used when fusing, melting, refining, etc. of a suitable metal material as a raw material. In addition, in the current night-based operation, the cold material can be heated, melted, and melted before the electric furnace and other metal melting furnaces are energized. An oxygen burner or the like can also be used. The first and second consecutive ON-Tap
The time can be shortened (for example, the average has been reduced from 68 minutes in the past to an average of 61 minutes), and the unit power consumption of each melting can be reduced (for example, 2000 KWH / ch).

In the non-consumable water cooling lance according to the second aspect, the fuel injection pipe C is detachably attached to the oxygen injection pipe A via the holder D, so that the fuel injection pipe C can be easily removed. Therefore, maintenance and the like can be easily performed, and safe use is possible. Moreover, by attaching the holder D to an existing non-consumable water-cooling lance, the fuel injection pipe C can be easily attached. That is, the handling is simple, the workability is more excellent, and the cost can be reduced with a simple configuration.

Further, in the non-consumable water-cooling lance according to the third aspect, the fuel injection pipe C is composed of an outer pipe 1 and an inner pipe 2, and a liquid or gaseous fuel is appropriately supplied from the tip of the inner pipe 2. And the compressed air can be injected from between the inner pipe 2 and the outer pipe 1 so as to surround the injected fuel appropriately, so that the fuel can be appropriately mixed with the compressed air without fail,
It becomes easy to burn. Moreover, the structure of the tip portion of the fuel injection pipe C can be simplified, its manufacture and maintenance become easy, and even if it is damaged by the splash of the molten metal, it can be easily repaired. In addition, since the compressed air can be injected so as to surround the injected fuel as appropriate, the fuel (fuel injection port 5) is surrounded by the compressed air, and the molten metal splash can be used. Is difficult to block. Eventually, there is no danger of flashback, explosion, etc., and the safety is high.

In the non-consumable water cooling lance according to the fourth aspect, the cooling pipe 7 is provided so as to cover the outer peripheral surface portion of the outer pipe 1 of the fuel injection pipe C, and the cooling water can be circulated and supplied into the cooling pipe 7. With such a configuration, the fuel injection pipe C can be reliably cooled, and the durability of the fuel injection pipe C can be increased. In addition, by cooling the fuel injection pipe C, flashback, explosion and the like are less likely to occur, and the safety is excellent.

[Brief description of the drawings]

FIG. 1 is a schematic side view illustrating a non-consumable water cooling lance of the present invention.

FIG. 2 is a schematic front view illustrating a non-consumable water cooling lance of the present invention.

FIG. 3 is a longitudinal sectional side view illustrating a fuel injection pipe of the non-consumable water-cooling lance of the present invention.

FIG. 4 is a vertical sectional side view illustrating another fuel injection pipe of the non-consumable water-cooling lance of the present invention.

[Explanation of symbols]

Reference Signs List A oxygen blowing pipe B powder blowing pipe C fuel injection pipe D holder 1 outer pipe 2 inner pipe 3 fuel supply port 4 compressed air supply port 5 fuel injection port 6 compressed air injection port 7 cooling pipe 8 cooling water injection port 9 Cooling water outlet

Claims (4)

[Claims] 1. An oxygen blowing pipe for blowing oxygen or an oxygen-containing gas used in an electric furnace and other metal melting furnaces for melting, melting, refining, etc. of a suitable metal material as a raw material. And a non-consumable water-cooling lance having a powder injection pipe for injecting charcoal powder or lime powder, wherein the holder is mounted on an oxygen injection pipe, and the fuel injection pipe for appropriately injecting fuel is connected to the holder. A non-consumable water-cooling lance, which is attached to an oxygen injection pipe via a through hole. 2. The fuel injection pipe according to claim 1, wherein the fuel injection pipe is detachably attached to the oxygen injection pipe via a holder.
Non-consumable water cooling lance as described. 3. A fuel injection pipe comprising an outer pipe and an inner pipe,
A liquid or gaseous fuel can be appropriately injected from the inner tube tip, and compressed air can be injected from between the inner tube 2 and the outer tube 1 so as to surround the injected fuel. The non-consumable water-cooling lance according to claim 1 or 2, wherein 4. A cooling pipe is provided so as to cover an outer peripheral surface portion of an outer pipe of the fuel injection pipe, so that cooling water can be circulated and supplied into the cooling pipe. The non-consumable water cooling lance according to claim 3.