JPH0129232Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a device for preventing metal adhesion at the mouth of a refining furnace.

Conventional technology Splash (slopping) that blows up during refining adheres to the open-shaped smelting furnace mouth (especially converter).
A phenomenon called so-called metal adhesion occurs, and the amount of deposits increases in proportion to the number of refining cycles, narrowing the diameter of the furnace and hindering furnace operation. Work is underway to remove the adhered metal. A common method for removing bullion is to use the heat retained in the metal by an oxygen nozzle that repeatedly impacts the part in the scrap charging chute to inject and burn the metal, melting the bullion block and letting it fall under its own weight. It is.

In addition, an electrically conductive refractory is installed at the part of the furnace mouth where the metal is attached, such as a converter, and the electrically conductive refractory is energized to maintain the adhered metal in a heated state. A device for preventing metal adhesion at the furnace mouth (Utility Model Application No. 57-92753) that prevents solidification is known.

Problems to be Solved by the Invention The above-mentioned known techniques apply mechanical shock to the furnace body and lining refractories, so there is a risk that the furnace body will be damaged; , there are problems such as problems with furnace operation. Also,
The technology described in the above-mentioned publication requires a complicated furnace construction process in which a special refractory is mixed into the lining layer, and the structure is complicated.Moreover, the electricity applied to the deposited metal, resistance heat generation, etc. are uniform, and all deposits are heated uniformly. It is difficult to imagine that it is possible to ensure that the bare metal easily falls off, and it is also clear that it has poor applicability to actual furnaces in terms of the durability of the energizing device and the complexity of installation.

Means for Solving the Problems The present inventors have succeeded in developing the present invention as a result of various studies and experiments to solve the various drawbacks of the conventional technology and prevent metal adhesion. Although the technical configuration is as specified in the claims of the above-mentioned utility model registration, it will be explained in more detail based on the attached drawings showing a specific example of the present invention. FIG. 1 is a longitudinal sectional view of the mouth of a converter to which the inventive metal adhesion prevention device is applied, and FIG. 2 is a top view.

In the drawing, 1 is the metal fittings at the mouth of the refining furnace;
A large number of wind boxes 2 are installed inside the furnace mouth hardware 1 as shown in the figure. These wind boxes 2 are provided with a large number of gas injection ports A, B, C, . The inlet pipe 3 is connected to a gas supply source (not shown).

By arranging the center line of the gas outlet at an angle of 0° to 60° with respect to the diameter of the refining furnace, the ejected gas is injected in a swirling manner close to the inner circumferential surface of the furnace mouth, and the inner circumferential surface is covered with gas. This coating prevents the splash from reaching the inner peripheral surface of the furnace mouth, which is effective in preventing metal adhesion.

In addition, as shown in Figure 1, the direction of gas ejection from the gas ejection ports A, B, C, etc. is set upwards for the gas ejection ports B, horizontally for the B ejection ports, and downward for the C ejection ports to prevent metal adhesion. can be further enhanced.

In operation of the device of the present invention, the gas introduction pipe 3 introduced from the gas container outside the furnace is connected to the wind box by passing through the outer surface of the furnace body via the trunnion shaft that serves as the shaft for tilting the furnace.

The gas is ventilated throughout the furnace operation, but the air volume is 100% during the blowing period when the most deposits are generated, 30 to 60% during the period from heating up to pouring, and from the completion of blowing to the completion of tapping.
The ventilation should be 60-80%. Inert gases such as nitrogen and argon are used to prevent secondary welding caused by combustion, and the furnace opening box itself serves as a cooling box to supplement the durability of the refractories around the furnace opening. The ejected gas forms a gas film over the surface of the furnace nozzle metal, thereby preventing the blown up splashes from coming into contact with the ground, and preventing the furnace nozzle metal itself from adhering and accumulating.

Effects of the invention (1) The furnace operation rate is improved by preventing metal adhesion at the mouth of the opening and allowing the furnace operation to continue smoothly.

(2) Labor savings can be achieved by reducing the time required for cutting bullion.

(3) By cooling the area around the furnace mouth metal fittings, thermal distortion of the can body is prevented, maintaining the strong furnace shell structure which is the original purpose of the can body, and preventing the lining refractory from falling.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal section of the converter mouth section to which the inventive metal adhesion prevention device is applied, and Fig. 2 is a top view. : Gas introduction pipe.

Claims (1)

[Scope of claim for utility model registration] 1. A large number of wind boxes 2 are provided in the metal fittings 1 at the mouth of the refining furnace,
a plurality of gas injection ports A communicating with the wind box 2;
B, C, . . . are opened on the inner surface of the furnace mouth portion, and a gas introduction pipe 3 is communicated with the wind box 2.A device for preventing metal adhesion at the mouth of a refining furnace. 2 The center line of the injection port is 0° to the diameter of the refining furnace.
The device for preventing metal adhesion at the mouth of a refining furnace as set forth in claim 1 of the utility model registration, which is arranged at an angle of 60°.