JP2550891Y2 - Smelting furnace lance - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a lance of a smelting furnace for supplying ore (including raw ore, silica sand, lime, etc.) and oxygen (including oxygen-enriched air) to the smelting furnace. In particular, the present invention relates to a lance of a smelting furnace that can be used for heating the smelting furnace (hereinafter, simply referred to as a lance).

[0002]

2. Description of the Related Art Conventionally, in a smelting furnace such as a smelting furnace or a copper smelting furnace in a copper smelting process, powder or granular ore is blown into a molten metal in the furnace together with oxygen for promoting blowing. A lance composed of an outer tube and an inner tube is provided.

Here, a method of heating the molten metal in the furnace using the lance has been attempted, and the present applicant has proposed a method as shown in FIG. 2 (Japanese Patent Application No. 63-7509).
No. 7). That is, in this method, the outer tube 6 is pulled up by the lance support mechanism until the exhaust port 6f comes close to the ceiling wall 8a of the furnace body 8, the inner tube (not shown) is taken out from the outer tube 6, and the nozzle of the burner gun 7 is used instead. 7b is inserted and fixed. Next, high-pressure air is supplied to the burner gun 7 from the air supply source 1 via the valve 2 and a small amount of liquid fuel is supplied from the fuel supply source 3 via the valves 4, 5, and 8 to form a mist. Liquid fuel is supplied to the nozzle 7b.
From the tip 7c of the furnace. As a result, the interior of the furnace body 8 is at a high temperature, so that the injected liquid fuel is ignited at the exhaust port 6f, and a flame is generated from the exhaust port 6f toward the molten metal in the furnace body 8 and this flame is generated. Heats the molten metal. Further, oxygen is supplied to a lance head 6b provided above the outer pipe 6 through an air supply pipe 6a to control the combustion of the flame.

[0004]

However, in the conventional heating method using a lance, in order to heat the molten metal, the burner gun 7 is attached to the outer tube 6 after removing the inner tube from the outer tube 6 of the lance. Therefore, there is a problem that it takes time to replace the inner tube with the burner gun 7.

The present invention has been made in view of the above circumstances, and has as its object to provide a lance of a smelting furnace that can start heating easily and in a short time.

[0006]

The lance of the smelting furnace according to the present invention has a lance of a smelting furnace in which an inner pipe for blowing ore is inserted into an outer pipe for blowing oxygen. A mounting portion to which a fuel supply pipe for supplying fuel for heating is connected is provided.

[0007]

In the lance of the smelting furnace according to the present invention, for example, immediately after the supply of ore to the inner pipe is stopped, fuel for heating is supplied into the inner pipe from the fuel supply pipe mounted on the mounting portion. Thereby, the heating can be started immediately.
That is, the fuel supplied into the inner pipe is supplied from the exhaust port of the outer pipe into the smelting furnace, where it is ignited by the heat in the smelting furnace to generate a flame and start heating.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lance according to an embodiment of the present invention will be described below with reference to the drawings.

The lance of the present embodiment comprises an outer tube 20 and an inner tube 10.
And has a double tube structure. The outer tube 20 is fixed to the oxygen introduction header 21 by a scroll chuck 30 and is held in communication with the oxygen introduction header 21. The oxygen B is supplied to the oxygen introduction header 21 through the oxygen conduits 22b and 22a, and then guided to the outer tube 20. On the other hand, the inner tube 10 penetrates the oxygen introduction header 21 and is inserted into the outer tube 20. And ore A
Is supplied to an inner pipe header 11 provided at the top of the inner pipe 10 through a raw material conduit 15 formed of a pipe (a pipe lined with ceramics) together with air for conveying the ore.

The oxygen introduction header 21 and the scroll chuck 30 are moved up and down by an elevating winch (not shown) together with the oxygen conduit 22a and the outer tube 20, and are supported by a lance guide 33 by guide rollers 32 so as to be able to move up and down. Have been. At this time, the oxygen conduit 22a is
As it moves up and down, it comes into and out of the oxygen conduit 22b. Further, the inner tube 10 is
Separately and independently suspended by a wire 14 wound around an inner tube elevating winch (not shown).

An insertion hole 1a into which the lance is inserted is formed in the ceiling of the furnace body 1, and the inner tube 10 and the outer tube 20 are inserted into the furnace 3 through the insertion hole 1a. The molten metal is set to a predetermined height from the molten metal surface 2.

The inner tube header 11 is provided with a mounting portion (for example, a one-touch coupler) 42. The mounting portion 42 has a fuel supply tube 40 for supplying fuel for heating into the inner tube 10. It is detachably connected. A valve 41 for opening and closing the passage is interposed in the fuel supply pipe 40, and a liquid fuel tank (not shown) is connected thereto. When the valve 41 is opened, the liquid fuel C is supplied to the inner pipe 10. It is supposed to be.

Next, a method of using the lance of this embodiment will be described.

In a normal smelting process, ore A is supplied into the inner pipe 10 by carrier air and oxygen B is supplied to the outer pipe 2.
The ore A and the oxygen B are blown toward the surface 2 of the molten metal in the furnace 3 by supplying the ore A into the furnace 0. As a result, the ore A and the oxygen B melt into the molten metal and are heated, so that blowing is promoted.

When it is necessary to keep or heat the molten metal in the furnace 3 when the normal blowing operation by the lance is temporarily stopped, the valve 41 interposed in the fuel supply pipe 40 is opened to open the inner pipe. Inner tube 10 connected to header 11
With the liquid fuel tank. At the same time, carrier air is supplied to the inner pipe header 11 via the raw material conduit 15. This transport air becomes so-called primary air, so that the liquid fuel is atomized and flows out of the inner pipe 10 through the outer pipe 20 into the furnace 3 to ignite. Further, the oxygen conduits 22b, 22a
And oxygen B is supplied from the oxygen introduction header 21 into the outer tube 20. The supplied oxygen B is mixed with the air-fuel mixture flowing down from the inner pipe 10 and supplied from the outer pipe 20 to the furnace interior 3 to be used for promoting combustion (the oxygen B acts as so-called secondary air). .)

In this embodiment, by opening the valve 41, a mixture containing liquid fuel is supplied from the fuel supply pipe 40 into the furnace 3, so that the molten metal can be heated or kept warm. That is, in the above-described heating method using the conventional lance, heating could not be performed for a time until the burner gun 7 was replaced after the normal blowing operation was stopped, but in the present embodiment, immediately after the blowing operation was stopped, Heating can be performed.

Moreover, in the present embodiment, a mounting portion 42 may be provided on the inner tube header 11 of the conventional lance, and the fuel supply pipe 40 may be connected to the mounting portion 42. No need to change, very economical.

[0018]

As described above, according to the lance of the present invention, the inner pipe for blowing ore is connected to the inner pipe in the lance of the smelting furnace inserted in the outer pipe for blowing oxygen. Since a mounting portion to which a fuel supply pipe for supplying fuel for heating is connected is provided, fuel for heating is supplied from the fuel supply pipe into the inner pipe, and the supplied fuel is ignited to generate a flame. Thus, heating can be started easily and in a short time.

[Brief description of the drawings]

FIG. 1 is a front view showing a lance according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a conventional heating method using a lance.

[Explanation of symbols]

 Reference Signs List 10 inner pipe 11 inner pipe header 20 outer pipe 40 fuel supply pipe 42 mounting part

Claims (1)

(57) [Scope of request for utility model registration] 1. A lance of a smelting furnace in which an inner pipe for blowing ore is inserted into an outer pipe for blowing oxygen, a fuel supply pipe for supplying fuel for heating to the inner pipe is connected. A lance for a smelting furnace provided with a mounting portion.