JP2875870B2 - Oxygen / fuel burner for flash smelting ore concentrate burner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an oxygen / fuel burner incorporated in a concentrate burner of a non-ferrous metal flash smelting furnace.

(Prior Art) Conventionally, an oxygen / fuel burner (hereinafter referred to as an OF burner) has been incorporated in a concentrate burner at the top of a non-ferrous metal flash smelting furnace. That is, as shown in a schematic sectional view of FIG. 4, an OF burner 3 is arranged so as to be concentric with a concentrate chute 2 vertically provided at a central portion of a concentrate burner main body 1. 3. The concentrate falling in the concentrate chute 2 by the combustion flame of 3 is ignited,
It is configured to promote a reaction with the reaction air supplied from the concentrate burner main body 1. The OF burner used in this manner is heated by the radiant heat from the furnace and from the flame of the burner, and the OF burner is heated to around 500 ° C and deformed. In order to prevent the supply section from burning, an OF burner outer cylinder having a water cooling structure has been used. That is, the conventionally used OF burner has a configuration as shown in the sectional view of FIG. In the figure, 4
Reference numeral denotes an auxiliary fuel introduction pipe, and reference numeral 5 denotes an oxygen blowing pipe which is provided concentrically outside the auxiliary fuel introduction pipe 4. A water-cooled jacket section 6 having a double wall is provided outside the oxygen blowing pipe 5.
Is provided, and cooling water is passed through the water cooling jacket portion 6 to cool the entire burner. 7
Is a burner chip provided at the tip of the auxiliary fuel introduction pipe 4 and the oxygen injection pipe 5, and has an auxiliary fuel ejection hole 8 and an oxygen ejection hole 9.

Although the conventional OF burner as described above has no problem in terms of heat resistance, it has a disadvantage that the outer diameter of the burner becomes large and very heavy because it has a water-cooled jacket portion. Also, in order to supply a large amount of oxygen, it is necessary to reduce the pressure loss by increasing the oxygen blowing pipe or to increase the pressure of the supplied oxygen.
If the oxygen blowing pipe is made thicker, the outer water cooling jacket must also be made larger, resulting in a thicker and heavier one. In addition, when increasing the pressure of oxygen, an oxygen compressor is required, which requires extra power cost. In addition, since the water cooling jacket of the OF burner may be worn by the concentrate charged into the concentrate chute and cause holes to occur, water leakage may occur. There was also a problem that it took time. More importantly, if the outer diameter of the OF burner is increased, it is necessary to increase the diameter of the concentrate chute in order to secure a space for the concentrate to flow outside, Changing the shape of the concentrate burner requires a great deal of caution, as the shape of the entire burner has a significant effect on the reactivity of the concentrate.

(Problems to be Solved by the Invention) The present invention eliminates the need for a water-cooled jacket portion of an OF burner having many problems as described above, and enables a large amount of oxygen to be easily supplied to a smelting reaction. The task is to improve the efficiency of

(Means for Solving the Problems) In order to solve the above problems, the present invention relates to an oxy-fuel burner disposed at the center of a concentrate burner of a flash smelting furnace, comprising: An inner oxygen blowing pipe provided concentrically with the auxiliary fuel introducing pipe and provided outside thereof, an outer oxygen blowing pipe provided concentrically with the inner oxygen blowing pipe and provided outside thereof, A self-melting smelting ore burner comprising an inlet pipe and a burner tip provided at the tip of the inner oxygen inlet pipe, and being entirely cooled by oxygen flowing through the outer oxygen inlet pipe. For oxygen and fuel burners.

Further, the present invention provides the above-mentioned
The present invention relates to a method of using an oxygen / fuel burner for a self-melting smelting ore burner, which means supplying high-pressure oxygen to an inner oxygen injection pipe of a fuel burner and supplying low-pressure oxygen to an outer oxygen injection pipe.

(Operation) An auxiliary fuel such as heavy oil is supplied to the auxiliary fuel introduction pipe of the oxygen / fuel burner for the self-melting smelting ore burner of the present invention.
Further, oxygen is supplied to the inner oxygen blowing pipe and the outer oxygen blowing pipe. In that case, the oxygen supplied to the inner oxygen injection pipe must be ejected from the burner tip at a speed of 100 m / s or more, preferably about 200 m / s, in order to prevent flashback, and a gauge pressure of about 1 kg / cm ² It is suitable to supply high-pressure oxygen. In addition, the oxygen supplied to the outer oxygen injection pipe acts as a cooling medium for the entire burner, and the conventional water cooling jacket is not required. Since the oxygen supplied to the outer oxygen injection pipe is far from the ignition point near the auxiliary fuel introduction pipe and the burner chip ejection hole, little consideration is required for preventing flashback. Therefore, oxygen at a low pressure can be supplied.

That is, the entire burner is cooled by the oxygen flowing in the outer oxygen injection pipe, thereby preventing the deformation of the burner. At the same time, a large amount of oxygen is dropped at a low pressure through the outer oxygen injection pipe to concentrate fine particles (partially oxidized). Oxidizing atmosphere is easily lost), and the reactivity in the flash smelting furnace is improved as compared with the conventional method of enriching the reaction air with oxygen.

(Example) Example 1 FIG. 1 is a sectional view showing an embodiment of an oxygen / fuel burner for a self-melting smelting burner according to the present invention, which is further incorporated into a self-melting smelting burner. The state is shown in the schematic sectional view of FIG. In the drawings, the same components as those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 4 denotes an auxiliary fuel introduction pipe, and reference numeral 10 denotes an inner oxygen injection pipe provided concentrically outside the auxiliary fuel introduction pipe 4. An outer oxygen blowing pipe 11 is provided outside the inner oxygen blowing pipe 10 so as to be concentric therewith. A burner chip 7 having an auxiliary fuel ejection hole 8 and an oxygen ejection hole 9 is attached to the tip of the auxiliary fuel introduction pipe 4 and the inner oxygen injection pipe 10. In FIG. 2, reference numeral 12 denotes a dispersion cone for dispersing the concentrate attached near the outer lower end of the outer oxygen injection pipe 11.

The oxygen / fuel burner for the flash smelting and refining burner having the above configuration is used as the auxiliary fuel introduction pipe 4 as SUS3 having an inner diameter of 15 mm.
Using a tube made of 04, the inner oxygen injection tube 10 has an inner diameter of 40 mm
SUS304 tube, 90 mm inner diameter SUS3 as outer oxygen injection tube 11
Using a tube made of 04, the burner chip 7 was also made of SUS304, and incorporated into the concentrate burner as shown in FIG.
The operation was carried out in a flash smelting furnace. At that time, 100 / H of heavy oil is supplied to the auxiliary fuel introduction pipe 4, and industrial pure oxygen (O ₂ 90% by volume) is supplied to the inner oxygen injection pipe 10 at a gauge pressure of 1.0 kg / cm ² at 200 Nm ³ / H.
Similarly, industrial pure oxygen is applied to the outer oxygen injection pipe 11 at a gauge pressure of 0.
1000 Nm ³ / H was supplied at ² kg / cm ² . As a result, the oxygen / fuel burner could be used for a long period of 6 months or more without deformation.

Example 2 In a test small flash smelting furnace, an excess amount of oxygen required for combustion of heavy oil as an auxiliary fuel was removed using an oxygen / fuel burner according to the present invention as shown in FIG.・
The fuel is supplied from a fuel burner to perform a test operation, and using an oxygen / fuel burner as shown in FIG. 3 in the past, excess oxygen more than required for heavy oil combustion is mixed with the reaction air and supplied. (Ie, enriching the reaction air with oxygen).

 Table 1 shows the results.

From the results shown in Table 1, the oxygen efficiency of the method of the present invention is higher than that of the conventional method, and there is no great difference in the smoke ash generation rate. That is,
It can be seen that the smelting reaction is more efficiently performed using the oxygen / fuel burner according to the present invention.

Example 3 In a practical self-melting smelting furnace, the oxygen / fuel burner according to the present invention as shown in FIG. 1 is used and mixed with the amount of oxygen supplied through the oxygen / fuel burner and the reaction air to be supplied. The operation was performed while changing the ratio to the amount of oxygen, and the comparison was made.
Table 2 shows the results. In Table 2, the oxygen enrichment ratio indicates an average oxygen concentration calculated by summing the oxygen-enriched reaction air and the oxygen supplied from the oxygen / fuel burner. The immiscible oxygen ratio refers to the ratio of the amount of oxygen supplied through the oxygen / fuel burner to the total amount of oxygen supplied to the reaction shaft of the flash smelting furnace.

According to Table 2, Case 2 is superior in both oxygen efficiency and smoke ash generation rate, and the ratio of supplying oxygen directly to the reaction shaft through the oxy-fuel burner without mixing with the reaction air is increased. It can be seen that this improves the smelting reaction in the reaction shaft.

(Effect) As described above, according to the oxy-fuel burner for the smelting and smelting ore burner of the present invention and the method of using the same, the water cooling jacket conventionally required becomes unnecessary,
The weight of the oxygen / fuel burner can be reduced, and measures against water leakage are not required. In addition, it is possible to supply a large amount of oxygen at a low pressure from the oxygen / fuel burner to the inside of the falling concentrate particles (particularly oxidizing atmosphere is easily lost), and the reaction shaft of the flash smelting furnace Oxygen efficiency is improved by increasing the reactivity within.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of an oxygen / fuel burner for a flash smelting ore concentrate burner of the present invention, and FIG. 2 is a schematic view showing a state where the burner is incorporated into a flash smelting ore concentrate burner. It is sectional drawing. FIG. 3 is a sectional view showing a conventional oxygen / fuel burner, and FIG. 4 is a schematic sectional view showing a state where the burner is incorporated in a self-melting smelting concentrate burner. 1 ... concentrate burner body, 2 ... concentrate chute, 4 ...
Auxiliary fuel inlet pipe, 7 Burner tip, 10 Inner oxygen inlet pipe, 11 Outer oxygen inlet pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C22B 15/00 102 F23D 14/38

Claims (1)

(57) [Claims] 1. An oxygen / fuel burner disposed through a tubular concentrate chute of a concentrate burner of a flash smelting furnace, comprising: an auxiliary fuel introduction pipe; and concentric with the auxiliary fuel introduction pipe. And an inner oxygen blowing pipe for high-pressure oxygen provided outside thereof,
An outer oxygen blowing pipe for low-pressure oxygen provided concentrically with the inner oxygen blowing pipe and provided outside thereof, and a burner tip provided at a tip of the auxiliary fuel introduction pipe and the inner oxygen blowing pipe. An oxygen / fuel burner for a self-melting smelting ore burner, which is configured to be cooled by oxygen flowing in an oxygen suction pipe.