JPH0638110Y2 - Nonferrous metal blowing lance - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a non-ferrous metal blowing lance for blowing a powdery material together with a gas into a solution in non-ferrous metal smelting such as copper smelting.

[Conventional technology]

Conventionally, in non-ferrous metal smelting such as copper smelting, in order to blow powdery substances such as concentrate, dust collection, and coal into the solution together with air and oxygen as reaction gases, a partial cutout in FIG. A lance having a structure as shown in the sectional view is used. That is, the outer tube 2 is connected to the lower opening of the header 1 having a cylindrical shape with the upper part closed and the lower part is squeezed into a frustoconical shape, and extends into the outer tube 2 through the upper center of the header 1. Inner tube 3
It has a double tube structure with. Then, the reaction gas is supplied from a hose 5 connected to a supply port 4 provided on the side surface of the header 1, and the powdered material such as concentrate is supplied from a hose 6 connected to communicate with the inner pipe 3. The powdery substance and the gas are mixed in the outer pipe 2 below the lower end of the inner pipe 3,
It is blown into the solution.

However, the conventional lance described above has the following problems. That is, the blowing rate from the lance of the powdery material and the gas has an influence on the efficiency of the smelting reaction and the damage to the lining of the furnace wall and the furnace body ceiling due to the generation of the splash of the solution, and the blowing rate depends on the furnace conditions. It is important to choose properly. And in order to properly select the blowing rate from the lance, it is necessary to change the diameter of the outer tube of the lance according to the supply amount of the concentrate and other powdery substances and the supply amount of the gas. In the lance with a double pipe structure, it is necessary to keep the inner diameter of the outer pipe larger than the outer diameter of the inner pipe to some extent to keep the gas flow space, so the diameter of the outer pipe cannot be freely selected. Atsuta Moreover, when the outer tube is converted into a tube having a different diameter, the inner tube is passed through the inside, which makes it difficult to replace the tube.

Therefore, as shown in the partially cutaway sectional view of FIG. 4, the inner pipe 3 penetrating the upper center of the header 1 is opened inside the header 1, and the gas supply port 4 is opened at the position where the inner pipe 3 is opened. We have developed a lance that is configured to open to the side surface of the header 1 above and to connect the lance pipe 7 to the lower opening of the header 1. In the case of such a lance, since the inner tube is not inserted through the lance tube 7, the lance tube 7 having an inner diameter that provides an appropriate drawing speed according to the amount of powder or gas blown can be easily replaced. Is possible.

However, even in the lance as shown in FIG.
The powder substance supplied from the inner pipe 3 is blown in the direction opposite to the side where the gas supply port 4 is provided, and the local portion 8 of the header 1 is worn, which shortens the life of the lance device itself. It was Moreover, since the powdery substance and the gas are mixed in the header 1, the powdery substance is more likely to flow toward the gas supply port 4 due to some turbulence of the air flow (this often occurs at the start or stop of blowing). The phenomenon in which the gas flows back into the chamber easily occurs, and this can be prevented to a considerable extent by configuring the gas supply port 4 so as to open above the opening of the inner pipe 3, but the gas used is oxygen-enriched air. In such cases, there is a possibility of explosion and flashback, so there is a problem that it is necessary to prevent such a situation from occurring more completely.

[Problems to be solved by the device]

An object of the present invention is to provide a non-ferrous metal blowing lance that solves the above problems.

[Means for Solving the Problems]

Means for solving the problems according to the present invention include a hedder having a cylindrical shape with an upper part closed and a lower part squeezed into a frustoconical shape, and an opening in the hedder through the center of the upper part of the hedder. An inner pipe, a plurality of communication pipes that are open toward the center of the header at equal intervals on the cross-section circumference of the side surface of the header above the opening position of the inner pipe of the header, and communicate with the communication pipes. A non-ferrous metal blowing lance in which a donut tube having a supply port formed to surround the hedder and supplied with gas from the outside is provided, and a lance tube is detachably connected to the frustoconical lower opening of the hedder,
The doughnut supply port is connected to a reducer for increasing the flow rate of gas, and a hose for supplying gas is connected to the reducer.

In the non-ferrous metal blowing lance of the present invention, a check valve may be connected to the reducer, and a hose for supplying gas may be connected to the check valve.

Incidentally, the reducer in the present invention is a pipe having a shape in which the cross-sectional area is gradually reduced, and the gas flowing at a predetermined flow velocity has a narrow flow passage in the reducer, so that the flow velocity becomes high. .

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 1 is a partially cutaway vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view.

Reference numeral 1 is a header, which has a cylindrical shape with an upper part closed and a lower part that is squeezed downward into a frusto-conical shape.
A flange 11 is provided at the lower end opening. Reference numeral 3 denotes an inner pipe, which penetrates the upper center of the header 1 to
It is provided so as to open inside. A communication pipe 9 is opened on the side surface above the position where the inner pipe 3 of the header 1 is opened, and the end of the communication pipe 9 on the opposite side of the header 1 is arranged so as to surround the header 1. It is connected to a donut tube 10 provided, and the inside of the header 1 and the donut tube 10 are communicated with each other. In addition, it is necessary to provide a plurality of communication pipes 9 at equal intervals on the circumference of the cross section of the header 1, and at positions that open toward the center of the header 1. In the present embodiment, they are opposed to each other. Four pairs of two open communication pipes 9 are provided in the directions orthogonal to each other. Also, header 1
The lance tube 7 is detachably connected to the lower flange 11 of the.

The inner pipe 3 is connected to the curved pipe 12 via a flange outside the header 1, and the curved pipe 12 is connected to a hose 6 for transporting and supplying a powdery material.

Further, the donut tube 10 is provided with a supply port 4 for supplying gas, and the supply port 4 is connected with a reducer 13 which narrows the gas flow passage to increase the flow velocity through a flange. . Further, on the side opposite to the side connected to the supply port 4 of the reducer 13, when gas is flowing toward the supply port 4, it is open, but when it flows in the opposite direction, it is closed. A stop valve 14 is connected via a flange. A hose 5 for supplying gas is connected to the check valve 14.

Note that the reducer 13 and the check valve 14 may be provided with only the reducer 13 or a check valve depending on the degree of flammability of the powdered substance to be blown in and the easiness of a flashback phenomenon determined by the oxygen content of the gas. It may be performed appropriately such as by arranging

[Action]

Since the non-ferrous metal blowing lance of the present invention is configured as described above, powder materials such as concentrate, dust collecting dust and coal are supplied from the inner pipe 3 by gas flow through the hose 6. If the reaction gas such as air or oxygen-enriched air and the hose 5 are supplied through the check valve 14, the reducer 13, the supply port 4, the donut pipe 10 and the communication pipe 9, the powdery matter is lance pipe together with the gas. From 7, it is blown into the solution. At that time, communication pipe 9
Is open above the opening of the inner pipe 3 on the side surface of the header 1, so that the powdery substance is unlikely to flow backward toward the communication pipe, and the communication pipe 9 is opened opposite to the side surface of the header 1. Therefore, the gas flows evenly to both sides of the falling powdery material as indicated by the arrow B, so that the powdery material is not blown to one side and the inner surface of the header 1 is not worn. In addition, even if a phenomenon such as the occurrence of turbulence in the air flow of the powdery substance toward the communicating tube 9 and ignition occurs due to some turbulence of the air flow, the flow velocity of the gas is increased at the portion of the reducer 13. , Flame is hose 5
It is possible to suppress the propagation to the. And
If a flashback occurs through the reducer 13, the check valve 14 can be closed to prevent an accident from occurring.

When it is desired to change the amount of powder or gas blown in or change the blowing speed, the inner pipe 3 is not inserted through the lance pipe 7, so that the lance pipe can be easily replaced with a lance pipe having an appropriate diameter. .

[Effect of device]

As described above in detail, according to the lance for blowing non-ferrous metal of the present invention, when the powdery substance and the gas are blown into the solution, the blowing speed can be freely selected by selecting the diameter of the lance tube. Not only can it be adjusted, but wear of the header due to uneven flow of powder can be prevented. Further, there is an effect that it is possible to prevent the powdery substance from flowing back to the gas supply system due to the turbulence of the air flow, and it is possible to prevent the risk of flashback or the like.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view of FIG. 3 and 4 are partially cutaway sectional views showing a conventional non-ferrous metal blowing lance. 1 ... Hedder, 2 ... Outer pipe, 3 ... Inner pipe 4 ... Supply port 5,6 ... Hose, 7 ... Lance pipe 8 ... Local, 9 ... Communication pipe, 10 ... Donut pipe 11 …… Flange, 12 …… Curved tube, 13 …… Reducer 14 …… Check valve

Claims (2)

[Scope of utility model registration request] 1. A hedder having a cylindrical shape with an upper part closed and a lower part squeezed into a frustoconical shape downward, and an inner tube penetrating the center of the upper part of the hedder and opening into the hedder. , A plurality of communicating pipes opening toward the center of the header at equal intervals on the cross-section circumference of the header side above the opening position of the inner pipe of the header, and surrounding the header by communicating with the communicating pipes. And a donut tube having a supply port to which gas is supplied from the outside, and a non-ferrous metal blowing lance in which a lance tube is detachably connected to a frustoconical lower opening of a header, the supply of the donut tube A non-ferrous metal blowing lance characterized in that a restrictor for increasing the flow rate of gas is connected to the mouth and a hose for supplying gas is connected to the reducer. 2. The non-ferrous metal blowing lance according to claim 1, wherein a check valve is connected to the reducer, and a hose for supplying gas is connected to the check valve.