JPS6032873Y2 - Molten steel equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a molten steel apparatus used for refining, alloy production, etc.

Conventionally, this type of steel melting equipment is a single electric furnace, arc furnace, induction furnace, etc., and raw materials are charged into the furnace body and heated and melted. High temperature gas is generated due to

The high-temperature gas is generally about 1200° C., and conventionally the high-temperature gas has been water-cooled or air-cooled and then released to the outside through a filter.

Recently, in order to make effective use of the high-temperature gas discharged from such furnace bodies, two furnace bodies have been combined as a pair, and the raw material is melted in one furnace body, and the high-temperature gas generated from the furnace body is transferred to the other. A method has been proposed in which raw materials are preheated by introducing them into a furnace body.

However, the furnace body had a tapping port at the top, and it was necessary to tilt the furnace body to tap the steel.

In order to tilt the furnace bodies as described above, it is necessary to make the connection between the pair of furnace bodies flexible, but a complicated mechanism is required to create a flexible connection while preventing the leakage of high-temperature gas. be.

The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks and to make it possible to tap steel without making the connection between a pair of furnace bodies any flexible. In this furnace body, each of the pair of furnace bodies is provided with a tapping port at the bottom, and the connecting duct is connected to a discharge duct.

The present invention will be described with reference to an embodiment shown in the drawings.
IB is a pair of furnace bodies, with tapping ports 1'A and 1'B at the bottom.
is provided, and the pair of furnace bodies IA.

The IBs are connected by a communication duct 2, one end of a discharge duct 3 with a damper 3A interposed is connected from the center of the communication duct 2, and a chamber part 4A provided at the center of a fixed duct 4 is connected to the other end of the discharge duct 3. Furthermore, a discharge duct 5 is extended from the chamber part 4A.

A pair of dampers 6A and 6B are provided on the left and right sides of the connecting portion of the discharge duct 3 of the communication duct 2, and a pair of dampers 7A and 7 are provided on the left and right of the connecting portion of the discharge ducts 3 and 5 of the fixed duct 4.
B is provided.

8 is a furnace cover for melting, which is applied to both furnace bodies IA and IB, on which electrodes 8A, 8B, and 8G are erected;
, 8C are connected to the transformer 10 via power supply cables 9A, 9B, and 9C.

IIA and IIB are supporting arms that support the bundles of electrodes 8A, 8B, and 8C.

12At12B is a pair of preheating furnace lids, and elbow ducts 13A and 13B to be connected to the ends of the fixed duct 4 are attached to the preheating furnace lids 12A and 12B, respectively.

14A and 14B are burners inserted into the side walls of the furnace bodies IA and IB, respectively.

To perform melting in the steel melting apparatus described above, raw materials are first introduced into the open furnace bodies IA and IB from, for example, packets, the preheating furnace lid 12A is attached to the furnace body IA, and the elbow duct 13A is connected to the fixed duct 4. A melting furnace lid 8 is attached to the furnace body IB.

The preheating furnace lid 12B is placed in the standby position. Then, in the preliminary stage, dampers 6A and 7B are closed, and dampers 6B, 3A, and 7 are closed.
Open A.

In this state, the raw material in the furnace body IA starts to be preheated by the burner 14A, and the raw material in the furnace body 1B is preheated by the burner 14B while being kept warm at the same time, an electric current is passed through the electrodes 8A, 8B, and 8C to generate an arc, and the arc heat is used to generate an arc. Dissolve the raw materials.

The exhaust gas generated in the furnace body 1B is discharged from the exhaust duct 5 via the communication duct 2, the exhaust duct 3, and the chamber portion 4A of the fixed duct 4.

When the exhaust gas temperature becomes sufficiently high, the main stage is entered and the damper 6A is opened and the damper 3A is closed.The exhaust gas from the furnace body IB is introduced into the furnace body IA through the communication duct 2, and the furnace body IA
After the raw material inside is preheated, it is discharged from the discharge duct 5 via the elbow duct 13A1, the fixed duct 4, and the chamber part 4A.

At the time of switching from the preliminary stage to the main stage, the exhaust gas is in the furnace body IA.
This is the point in time when the temperature T2 immediately before being introduced into the furnace body IA becomes higher than the temperature T1 inside the furnace body IA.

When the raw material in the furnace body IB is completely melted, the melt is tapped from the tapping port 1'B and received in a ladle 14 placed directly below the tapping port 1'B.

Of course, there is no need to tilt the furnace body IB at this time.

With this, the first melting preheating process, in which the preheating process was performed in the furnace body IA and the melting process was performed in the furnace body IB, is completed.

Next, the preheating furnace lid 12A of the furnace body IA is removed and placed in the standby position, and the melting furnace lid 8 is attached to the furnace body IA.
The preheating furnace lid 12 that was in the standby position after the raw materials were put into the
In the preliminary stage, the dampers 6B and 7B are closed and the dampers 6A, 3A, and 7B are opened, and then in the main stage, the damper 6B is opened and the damper 3A is closed.

Even in the second melting preheating process, the furnace body 1B is at a fairly high temperature during the melting process in the first melting preheating process, so a preliminary stage is often required as described above. .

Thereafter, the preheating process and the melting process are similarly performed alternately in the furnace bodies IA and IB.

It is desirable that the damper be opened and closed automatically by detecting the furnace body temperature and exhaust gas temperature.

The present invention provides a pair of furnace bodies connected to each other via a communication duct as described above, each of which is provided with a tapping port at its bottom, and a discharge duct is connected to the communication duct. There is no need to tilt the furnace bodies during tapping, and therefore there is no need to make the connections between the furnace bodies flexible, resulting in a very simple structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a plan view of a steel melting apparatus, and FIG. 2 is a side sectional view of the steel melting apparatus. In the figure, IA, IB...furnace body, 1'A, 1'
B... Steel tapping port.

Claims (1)

[Scope of utility model registration request] A steel melting apparatus comprising a pair of furnace bodies connected to each other via a communication duct, each of the pair of furnace bodies having a tapping port at its bottom, and a discharge duct connected to the communication duct.