JPH0443701Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a concentrate burner that causes a smelting reaction by blowing smelting raw materials and reaction air into an flash smelting furnace.

[Conventional technology]

There is a self-melting smelting furnace called a flash smelting furnace, which is one type of smelting furnace that uses sulfide concentrate as a raw material.

As shown in FIG. 5, the flash smelting furnace 1 includes a reaction tower 3 equipped with a concentrate burner 2 at the top, one end connected to the lower part of the reaction tower 3, and an outlet 4 on the side.
〓Settler 6 with outlet 5 and settler 6
It basically consists of a flue 7 connected to the other end. The smelting process is as follows. First, smelting raw materials 8 such as sulfurized concentrate, flux, and auxiliary fuel are blown together with preheated reaction air 9 from the concentrate burner 2 into the reactor tower 3 of the furnace. In the reaction tower 3, sulfur and iron, which are combustible components of the smelting raw material 8, react with the high temperature reaction air 9 and are stored in the settler 6. In the settler 6, which is the hot water pool, the molten material is Cu ₂ due to the difference in specific gravity.
〓10, which is a mixture of S and FeS, and 2FeO・SiO ₂
The main component is divided into 11 parts. 11 is discharged from the outlet 4 and introduced into the electric smelting furnace 12. On the other hand, the material 10 is extracted from the outlet 5 in accordance with the requirements of the next process, the converter.

In addition, the high-temperature exhaust gas 13 generated in the reaction tower 3 passes through the settler 6 and the exhaust flue 7 to the exhaust heat boiler 14.
cooled down. After entering the electric smelting furnace 12, the copper is heated and maintained by electric heat applied by an electrode 15, and is mixed with lump ore, lump flux, etc. charged into the electric smelting furnace 12 as necessary. The copper content further settles to the bottom of the furnace, and only the remaining copper content is discharged from the furnace through the outlet 16.

In such a flash smelting furnace, it is necessary for the reaction to be completed while the smelting raw materials fall through the reaction tower, and if the reaction is not completed, some of the unreacted materials will be released as waste heat along with the exhaust gas 13. It is carried away to the boiler and becomes smoke ash, and the other part is deposited on the surface of the melt in the lower part of the reaction tower 3, which prevents the formation of smoke.

Therefore, the focus position where the oxidation reaction of the concentrate in the reaction tower 3 is most active and the temperature is
It is important for reactor operation that it be located as high as possible within an appropriate range.

Incidentally, in recent years, in order to improve the heat balance of the flash smelting furnace and increase productivity, a concentrate burner for flash smelting has been used in which an oxygen blowing pipe and an auxiliary fuel introduction pipe are incorporated into the concentrate burner. That is, as shown in the schematic cross-sectional view of FIG.
A tubular concentrate chute 19 is vertically disposed in the center of the burner body 18 having a burner body 18 with its tip protruding slightly below the constriction part, and an oxygen blowing pipe 20 is provided passing through the center of the concentrate chute 19. , an auxiliary fuel introduction pipe 21 that extends concentrically through the oxygen injection pipe 20 and extends to the lower end of the oxygen injection pipe 20;
This is a concentrate burner for self-melting smelting.

In this type of self-smelting concentrate burner, an oxygen blowing pipe 20 and an auxiliary fuel introducing pipe 21
It has a fuel injection hole 22 in the center at the lower end, and a plurality of oxygen injection holes 23 surrounding the fuel injection hole 22.
It is normal to use a burner chip 24 equipped with It is configured to react with fuel such as heavy oil and concentrate falling from the concentrate chute 19.

In the concentrate burner having such a configuration, the combustion of the fuel supplied through the auxiliary fuel inlet pipe 21 not only improves the overall heat balance in the reaction tower of the flash furnace, but also allows the fuel to ignite quickly. The purpose is to burn the concentrate, thereby promoting the ignition of the concentrate. However, in the conventional concentrate burner for self-melting smelting, the oxygen injection hole 23 provided in the burner chip 24 was formed with the injection direction facing vertically downward, which ignited the fuel quickly and helped ignite the concentrate. This effect was not sufficient, and there was a problem in that the above-mentioned objective of forming the focus at the upper part of the reaction column could not be achieved.

[Problem to be solved by the invention] The purpose of the invention is to solve the above-mentioned drawbacks of the conventional concentrate burner for self-smelting and smelting, and to quickly ignite and burn with the oxygen injected with auxiliary fuel. The object of the present invention is to provide a concentrate burner for self-melting smelting, which can thereby promote the ignition of concentrate and, as a result, can raise the position of the focus in the reaction tower compared to the conventional one.

[Means to solve the problem]

The means of solving the problem of the present invention consists of a burner body with a ventilate-shaped constriction formed at the lower end, and a tube-shaped tube vertically disposed in the center of the burner body so that its tip protrudes slightly below the constriction. a concentrate chute, an oxygen blowing pipe provided through the center of the concentrate chute, and extending concentrically through the oxygen blowing pipe to a lower end of the oxygen blowing pipe. In the concentrate burner equipped with an auxiliary fuel introduction pipe, a fuel injection hole is opened in the center at the lower end of the oxygen injection pipe and the auxiliary fuel introduction pipe, and one side has an injection angle that This burner chip has two groups of oxygen blowing holes, one inclined toward the blowing hole and the other having a spray angle vertically downward or outward from the oxygen blowing tube.

〔Example〕

A specific example of the present invention will be explained in detail with reference to FIGS. 1, 2, and 3.

FIG. 1 is a schematic sectional view showing the whole concentrate burner for self-melting smelting of the present invention, FIG. 2 is a longitudinal sectional view showing the vicinity of the burner chip, and FIG. 3 is a horizontal sectional view. Reference numeral 18 denotes a burner main body, which has a bent ventilate shape at the lower part, and a reaction air inlet 17 is provided at the upper side surface.

A concentrate chute 1 is located in the center of the burner body 18.
9 is provided vertically, and its lower end reaches slightly below the ventilate-shaped constriction portion of the burner body 18. An oxygen blowing pipe 20 is provided through the center of the concentrate chute 19, and in this embodiment, its lower end protrudes slightly below the concentrate chute 19. An auxiliary fuel introduction pipe 21 is provided concentrically through the oxygen injection pipe 20, and its lower portion extends to the lower end of the oxygen injection pipe 20. Note that the auxiliary fuel introduction pipe 21 is
Specifically, as shown in FIGS. 2 and 3, the auxiliary fuel introduction pipe 21 is inserted through the inner pipe 25 of the oxygen injection pipe so that it can be extracted from the oxygen injection pipe 20. It is provided. A burner chip 26 is connected to the lower ends of the oxygen blowing pipe 20 and the auxiliary fuel introduction pipe 21, and a fuel injection hole 27 communicating with the auxiliary fuel introduction pipe 21 is located in the center of the burner chip 26 along its center line. A plurality of oxygen injection holes 28 are provided along the fuel injection hole 27, surround the fuel injection hole 27, and communicate with the oxygen injection pipe 20.
a and an oxygen jet hole 28b are provided. The oxygen nozzle 28a is provided at an angle such that the upper opening opens into the oxygen blowing pipe 20 and the lower opening opens near the fuel nozzle 27, so that the oxygen is supplied through the oxygen blowing pipe 20. The oxygen is injected directly below the lower opening of the fuel injection hole 27. Further, the oxygen ejection hole 28b is provided with an upper opening into the oxygen blowing pipe 20 and a lower opening inclined toward the outer circumferential side of the burner chip 26, and the oxygen is ejected from the oxygen injection hole 28b. The oxygen airflow is formed by extending the outer periphery of the oxygen blowing pipe 20 downward and facing outward from the imaginary plane.

Although it is absolutely necessary that the injection angle of the oxygen injection hole 28a is formed to be inclined toward the fuel injection hole 27, the injection angle of the oxygen injection hole 28b must be formed so as to be formed vertically downward. However, if the amount of oxygen injected is large, there is no problem in achieving the purpose of the present invention.

[Effect]

Since the concentrate burner for self-smelting smelting of the present invention is configured as described above, oxygen is supplied to the oxygen blowing pipe 20, and auxiliary fuel such as heavy oil is supplied to the auxiliary fuel introduction pipe 21, while refining If sulfide concentrate is dropped and charged from the ore chute 19 and air or oxygen-enriched air is introduced from the reaction air inlet 17 while the flash smelting furnace is operated, the fuel injection hole 27 of the burner chip 26
The fuel injected from the oxygen nozzle 28a immediately ignites and burns directly under the burner chip 26 due to the oxygen injected from the oxygen nozzle 28a to the vicinity of the fuel nozzle 27, heating the sulfide concentrate falling around it. It acts to hasten the ignition. And oxygen jet hole 28b
The oxygen injected from the sulfide concentrate is supplied to the falling sulfide concentrate to hasten its ignition, and by stirring it, it improves contact with the reaction air and speeds up the reaction rate.

Therefore, the sulfide concentrate charged from the concentrate chute 19 ignites quickly and the reaction rate increases, so the position of the focus in the reaction tower, which is the area where the reaction of the sulfide concentrate is most active and high temperature, rises. do.

[Effect of idea]

As explained in detail above, the concentrate burner for autogenous smelting of the present invention solves the drawback of not being able to raise the focus position in the reaction tower in the past, and improves autosmelting. By speeding up the ignition of the concentrate charged into the smelting furnace and increasing its reaction rate, the position of the focus can be raised and the smelting reaction can be carried out efficiently. be.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing the entire concentrate burner for self-melting smelting of the present invention, FIG. 2 is a longitudinal sectional view showing the vicinity of the burner chip, and FIG. 3 is a horizontal sectional view. FIG. 4 is a schematic sectional view of a conventional concentrate burner, and FIG. 5 is an explanatory view showing the entire flash melting furnace. 18... Burner body, 19... Concentrate chute, 20... Oxygen blowing pipe, 21... Auxiliary fuel introduction pipe, 26... Burner chip, 27... Fuel injection hole, 28a... Oxygen injection hole, 28b ...Oxygen vent.

Claims (1)

[Scope of utility model registration request] A burner body with a ventilate-shaped constriction formed at the lower end, a tubular concentrate chute hanging down from the center of the burner body so that its tip protrudes slightly below the constriction, and the concentrate. A precision fuel injection pipe having an oxygen blowing pipe provided through the center of the chute, and an auxiliary fuel inlet pipe passing concentrically through the oxygen blowing pipe and extending to the lower end of the oxygen blowing pipe. In the ore burner, the oxygen injection pipe and the auxiliary fuel introduction pipe are connected to the lower ends, a fuel injection hole opens in the center, surrounds the fuel injection hole, and one side has an injection angle inclined toward the fuel injection hole. The other is a concentrate burner for autosmelting, which has a burner chip equipped with two groups of oxygen injection holes whose injection angles are inclined vertically downward or outward from the oxygen blowing pipe.