JP2515541Y2 - Furnace bottom tapping device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace bottom tapping device for tapping steel from the bottom of a converter or an electric furnace.

[0002]

2. Description of the Related Art Conventionally, as a furnace bottom tapping device of this type, there is one disclosed in JP-A-62-63613.
That is, as shown in FIG. 6, the tap hole 2 is closed in the furnace bottom 1a of the furnace body 1 with a filling A made of a refractory material such as silica sand.
It is known that a gate 4 which is opened and closed by an actuator 3 such as an air cylinder is provided below the tap hole 2. In the above structure, when the molten steel B in the furnace body 1 is tapped into the ladle 6, when the actuator 3 is driven to open the opening / closing gate 4, the filling A drops into the ladle 6 and then the molten steel B Are taken into the ladle 6.

According to the above construction, even when the bottom bottom tapping device is a converter, the converter is tilted so that steel is tapped from a tapping port (not shown) formed in the upper part of the furnace body 1. Since it is not necessary, wasteful time for tilting the converter is reduced.
Further, since molten steel B does not flow into the upper portion 1b of the furnace body 1, the slag C is added to the refractory 1c adhered to the upper portion 1b.
Can be prevented as much as possible from being unnecessarily contacted and consumed, or the molten steel B coming into contact with the upper portion 1b of the furnace body 1 at a relatively low temperature and lowering its temperature as much as possible. Sa
In addition, it has been conventionally disclosed in Japanese Patent Laid-Open No. 2-66110.
As shown above, a pipe for supplying the filling A (not shown)
Is provided in the center of the main lance for oxygen blowing, and
Molten steel B and slag C are tapped in a ladle 6 and the tap 2 is tapped.
After cleaning the
Quickly fill the tapping port 2 with filling A from the pipe.
It is known that it is configured as described above.

[0004]

The present invention is to solve However, each of the above conventional
According to the configuration of the example, when the opening / closing gate 4 is opened to tap the molten steel B in the furnace body 1 into the ladle 6, the filling A is filled with the ladle 6.
Since there is no means to protect the gate 4 from falling into the heat resistant state, the high temperature slag C that is about to flow out after the molten steel B is tapped cannot be blocked by the gate. Therefore, the slag C is taken into the ladle 6,
Impurities are mixed in the molten steel B to deteriorate mechanical properties and corrosion resistance of, for example, high-purity carbon steel and high-purity stainless steel. Moreover, since the outflow of the slag C cannot be blocked, it cannot be reused for re-production,
It is extremely uneconomical.

After the completion of the tapping work, the tapping port 2 is cleaned and then closed by the gate 4 so that the filling A is filled.
Is filled. However, the cleaning operation of the tap hole 2 and the filling operation of the filling A cannot be performed at a high temperature, so that it is extremely difficult unless the furnace body 1 is cooled and the residual molten steel or slag is solidified.

This invention has been made in order to solve the above problems. Impurities in molten steel to be tapped are reduced as much as possible to achieve high-quality steelmaking, and slag can be reused for re-production. Moreover, it is an object of the present invention to provide a furnace bottom tapping device in which the tapping port cleaning and filling operation can be performed quickly and easily.

[0007]

Means for Solving the Problems] furnace bottom tapping apparatus according to the invention, only setting the opening and closing gates in the lower part of the tapping port formed in the furnace bottom, tapping the furnace body of the molten steel in the opening of the opening and closing gate in the configuration and the furnace bottom tapping device in which to provided a stopper lance having a central hole penetrating vertically is coated with a resistant fire was vertically movable, said tapping nozzle at the tip of the stopper lance and closing busy performed the release of the filling and inert gas fillings made of refractory in the tapping nozzle from the center hole
The stopper lance at the tip of the steel
By opening and closing the mouth, the molten steel is tapped and
It is characterized in that it is configured to cut off the lag .

[0008]

According to the present invention, when the opening / closing gate is opened for tapping the molten steel in the furnace body, the padding is removed and there is no means for heat-resistant protection of the gate, but at the tip of the stopper lance. By closing the tap hole, the outflow of slag can be blocked after the outflow of molten steel. Therefore, there is no fear that slag as an impurity will be mixed in the molten steel taken into the ladle, and mechanical properties and corrosion resistance can be improved when making steel such as high-purity carbon steel or high-purity stainless steel.

Moreover, since the outflow of slag can be blocked, it can be reused for reuse and is extremely economical. Further, when the tapping hole is closed by the stopper lance and an inert gas is released through the center hole of the stopper lance, the tapping port can be cleaned and cooled. It is possible to discharge the filling such as the above to fill the tap hole and repeat the rapid refining operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an example in which the furnace bottom tapping device according to the present invention is applied to a converter. In the figure, the same parts as those in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, a furnace body 1 covered with a refractory material 1c has an exhaust gas hood 7 arranged facing the upper opening 1d thereof, and is supported so as to be tiltable in the direction of arrow X and penetrates the exhaust gas hood 7. Then, the well-known main lance 8 and sub-lance 9 are set to be able to move up and down.

A steel outlet port 2 is provided in the furnace bottom portion 1a of the furnace body 1, and an actuator (not shown) such as an air cylinder is provided in the lower portion of the steel outlet port 2 to slide the sheet surface as shown in the figure. An opening / closing gate 4 that is opened / closed in the vertical direction is provided. A stopper lance 10 is provided above the tap hole 2 so as to be vertically movable through the exhaust gas hood 7, and the stopper lance 10 closes the tap port 2 so that the tap hole 2 can be opened and closed. The stopper lance 10
2 consists of a hollow pipe covered with a refractory material 10a, as clearly shown in FIG. 2, through which a filling material A such as silica sand or an inert gas a such as N ₂ gas passes through the center hole 10b. It is configured to be discharged from the tip portion 10c.

Now, the stopper lance 10 shown in FIG. 1 is lowered, and its tip 10c is fitted to the upper portion of the tap hole 2 whose lower portion is closed by the opening / closing gate 4, as shown in FIG. The filling A such as silica sand is discharged through the center hole 10b of the lance 10, and the tap hole 2 is filled with the filling A. After that, the stopper lance 10 is raised to tilt the furnace body 1, the crude molten steel is charged from the upper opening 1d, and the O ₂ gas b from the main lance 8 is blown as shown in FIG. It

In the molten steel B refined in the furnace body 1, when the actuator is driven to open the gate 4 as shown in FIG. 4, the filling A drops into a ladle (not shown), and Molten steel B is taken into the ladle. Above molten steel B
When the slug C is about to flow out as shown in FIG. In addition to blocking the outflow, the inert gas a is released through the center hole 10b of the stopper lance 10 to clean and cool the tap hole 2.

As is clear from the above, when the opening / closing gate 4 is opened to tap the molten steel B in the furnace body 1, the filling A is removed and there is no means for protecting the gate 4 with heat resistance. The high temperature slag C, which is about to flow out after the molten steel B is tapped, can be blocked by the stopper lance 10. Therefore, there is no risk of slag C being mixed as an impurity in the molten steel taken into the ladle, and mechanical properties and corrosion resistance can be improved when making steel such as high-purity carbon steel or high-purity stainless steel. . Moreover, as shown in FIG. 5, since the outflow of the slag C can be blocked, the slag C can be reused for reuse and is extremely economical.

After the completion of the above tapping operation, the tapping port 2 is closed by the gate 4 and the padding A as described in FIG.
The same refining work is repeated thereafter.

[0016]

As described in detail above, the present invention achieves high quality steel production by reducing impurities in the molten steel to be tapped as much as possible, and can reuse slag for re-production. In addition, it is possible to provide a furnace bottom tapping device in which cleaning of tapping taps and filling of fillings are easy and quick.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example in which a furnace bottom tapping device according to the present invention is applied to a converter.

FIG. 2 is an enlarged cross-sectional view of a main part for explaining a filling operation of filling material.

FIG. 3 is an enlarged cross-sectional view illustrating an oxygen blowing operation.

FIG. 4 is an enlarged sectional view for explaining a tapping operation.

FIG. 5 is an enlarged cross-sectional view explaining interruption of tapping work.

FIG. 6 is a cross-sectional view of essential parts showing an example of a conventional furnace bottom tapping device.

[Explanation of symbols]

 1 Furnace Body 1a Furnace Bottom 2 Steel Tap 4 Opening Gate 10 Stopper Lance 10a Refractory 10b Center Hole 10c Lance Tip A Filling B Molten Steel a Inert Gas

Claims (1)

(57) [Scope of utility model registration request] Setting the opening and closing gates in the lower part of claim 1. A furnace bottom which is formed in tapping nozzle only, the furnace bottom tapping device consisting configured to tapped molten steel in the furnace body in the opening of this opening gates, provided stopper <br/> Palance having a center hole penetrating vertically is coated with a resistant <br/> fire was to be movable up and down, its center the tapping nozzle at the tip of the stopper lance and closed busy the release of the filling and inert gas fillings consisting <br/> refractory to the tapping port from the bore
The stopper lance tip
By opening and closing the steel tap, the molten steel in the furnace can be tapped.
And a slag shutoff device, which is configured to shut off slag .