JPH0559196U - Furnace bottom tapping device - Google Patents

Abstract

(57) [Summary] [Objective] Impurities in the molten steel to be tapped are reduced as much as possible to achieve high-quality steelmaking, and slag can be reused for re-production, and the tapping outlet can be cleaned and cleaned. The filling operation of the filling is performed easily and quickly. [Structure] An opening / closing gate 4 is set at a lower portion of a tap hole 2 formed in a furnace bottom 1a, and a stopper lance 10 made of a hollow pipe covered with a refractory material 10a is provided above the furnace body 1 so as to be able to move up and down. The tip portion 10c is configured to close the tap hole 2 so as to be openable and closable.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bottom steel tapping device for tapping steel from the bottom of a converter or an electric furnace.

[0002]

[Prior Art]

 Conventionally, as a furnace bottom tapping device of this type, there is one disclosed in Japanese Patent Laid-Open No. 62-63613. That is, as shown in FIG. 6, a steel outlet port 2 closed with a filling A made of a refractory material such as silica sand is provided in the furnace bottom portion 1a of the furnace body 1, and an air cylinder of the air cylinder is provided below the steel outlet port 2. It is known that a gate 4 that can be opened and closed by such an actuator 3 is provided. In the above configuration, 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 The molten steel B is taken into the ladle 6.

According to the above configuration, even when the furnace bottom tapping device is a converter, the converter is tilted and 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 the molten steel B does not flow into the upper portion 1b of the furnace body 1, the slag C unnecessarily contacts the refractory 1c adhered to the upper portion 1b, which may be consumed and the It is possible to prevent the molten steel B from coming into contact with the upper portion 1b of the low temperature furnace body 1 and lowering its temperature as much as possible.

[0004]

[Problems to be solved by the device]

 However, according to the above configuration, when the opening / closing gate 4 is opened in order to take the molten steel B in the furnace body 1 to the ladle 6, the filling A drops into the ladle 6 and the gate 4 is heat-resistant. Since there is no protection means, it is impossible to block the high temperature slag C which is about to flow out after the molten steel B is tapped at the gate. Therefore, the slag C is taken into the ladle 6 and impurities are mixed in the molten steel B, which deteriorates mechanical properties and corrosion resistance of, for example, high-purity carbon steel or high-purity stainless steel. Moreover, since the outflow of the slag C cannot be blocked, the slag C cannot be reused for recycling and is extremely uneconomical.

After the steel tapping operation is completed, the tapping port 2 is cleaned and then closed by the gate 4 to be filled with the filling A. However, the cleaning of the tap hole 2 and the filling work of the filling A cannot be performed at a high temperature, so the furnace body 1 is cooled, and the remaining molten steel and slag are solidified, which is extremely difficult. Is.

This invention has been made in order to solve the above problems, and it is possible to reduce impurities in the molten steel to be tapped as much as possible to achieve high-quality steelmaking, and to reuse slag 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 work can be performed quickly and easily.

[0007]

[Means for Solving the Problems]

 The furnace bottom tapping device according to the present invention is configured such that an opening / closing gate is set at the bottom of the tapping port formed at the bottom of the furnace and the molten steel in the furnace body is tapped when the gate is opened. In the equipment, it is configured such that a suspension consisting of a hollow pipe covered with a refractory is provided above the furnace body so as to be able to move up and down, and the tip end thereof is configured to close the tap hole so that it can be opened and closed. And

[0008]

[Action]

 According to the present invention, when the opening / closing gate is opened for tapping molten steel in the furnace body, the filling is removed and there is no means for protecting the gate in a heat-resistant manner. It is possible to block the outflow of slag after the outflow of molten steel by closing the. Therefore, slag as an impurity is not 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. Also, if the inert gas is discharged through the center hole of the stopper lance with the stopper lance closed, the cleaning and cooling of the steel tap can be achieved. It is possible to repeat the rapid refining operation by discharging the filling such as the above to fill the tap hole.

[0010]

【Example】

 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, the furnace body 1 covered with the refractory material 1c is provided with an exhaust gas hood 7 facing the upper opening 1d, and is supported so as to be tiltable in the arrow X direction. A publicly known main lance 8 and sub lance 9 are set so as to be able to move up and down.

A steel outlet port 2 is provided on the furnace bottom portion 1a of the furnace body 1, and an actuator (not shown) such as an air cylinder is provided at 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 installed above the tap hole 2 so as to be able to move up and down through the exhaust gas hood 7. The stopper lance 10 closes the tap port 2 so that the tap hole 2 can be opened and closed. The stopper lance 10 is made of a hollow pipe covered with a refractory material 10a, as clearly shown in FIG. 2, and passes through a central hole 10b thereof and is filled with a filling material A such as silica sand or an inert gas such as N ₂ gas. The gas a is configured to be discharged from the tip portion 10c.

Now, the stopper lance 10 in FIG. 1 is lowered, and the tip 10c thereof 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 tapping hole 2 is filled with the filling A. After that, the stopper lance 10 is raised, the furnace body 1 is tilted, crude molten steel is charged from the upper opening 1d, and as shown in FIG. 3, the O ₂ gas b from the main lance 8 is blown for refining. It

When the molten steel B refined in the furnace body 1 is driven by the actuator to open the gate 4 as shown in FIG. 4, the filling A drops into a ladle (not shown), Molten steel B is taken into the ladle. As the molten steel B flows out, the stopper lance 10 is lowered, and when the slag C is about to flow out, as shown in FIG. 5, the tip end portion 10c thereof is fitted into the upper portion of the tapped steel outlet 2 to close it. The outflow of the slag C is blocked, and the inert gas a is discharged through the central 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 in order 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. However, 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 described above. Therefore, there is no mixing of slag C as an impurity in the molten steel taken into the ladle, and it is necessary to improve mechanical properties and corrosion resistance when making steel such as high-purity carbon steel or high-purity stainless steel. You can Moreover, as shown in FIG. 5, since the outflow of the slag C can be blocked, this can be reused for reuse and is extremely economical.

After the completion of the tapping operation, the tapping port 2 is closed by the gate 4 and filled with the filling A as described with reference to FIG. 2, and the same refining operation is repeated thereafter.

[0016]

[Effect of the device]

 As described in detail above, this invention achieves high-quality steel production by reducing impurities in the molten steel to be produced as much as possible, and can reuse slag for re-production. It is possible to provide a furnace bottom tapping device that is easy and quick to clean the mouth and fill the filling.

[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 cross-sectional view illustrating a tapping operation.

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

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 Central hole 10c Lance tip A Filling B Molten steel a Inert gas

Claims (1)

[Scope of utility model registration request] 1. A furnace bottom tapping device comprising an opening / closing gate set at a lower portion of a tapping port formed at the bottom of the furnace, and the molten steel in the furnace is tapped when the gate is opened. A stopper lance consisting of a hollow pipe covered with a refractory is provided above and above so that it can be opened and closed at its tip, and the filling made of refractory is passed through the center hole of the stopper. A furnace bottom tapping device, characterized in that it is configured to discharge an inert gas while filling the tapping port.