JPH02290912A - Apparatus and method for melting - Google Patents

Abstract

PURPOSE:To facilitate melting and refining and to improve the productivity by arranging a first and second chambers for melting and refining and means for allowing molten steel to inflow passing through division of both chambers. CONSTITUTION:Raw material A for melting is fed into a retaining part 13 from a feeding hole 15 and further fed to the first chamber 4 with a feeding device 14 and heated with arc from an upper electrode 10 and melted to make molten steel. A large quantity of the molten steel is stored and a part of this begins to flow over a weir 6 dividing the first chamber 4 from the second chamber 5 into the chamber 5 and when the molten steel is stored in the chamber 5 at the fixed quantity, the furnace body 2 is tilted with a tilting device 26 and the molten steel in the chamber 4 is passed through the weir 6 and caused to flow into the chamber 5, then the furnace body 2 is returned back. Successively, the raw material is melted in the chamber 4 with the same way as the above and at the same time, the molten steel caused to flow into the chamber 5 is heated with the arc from the electrode 20 to execute the refining, adjustment of the components and raising of the temp. thereof. The molten steel in the chamber 4 is not mixed into the molten steel during refining and the molten steel of good quality is obtd., and after discharging this from a discharging hole 23, this hole is closed and the furnace body 2 is tilted and the refining and the melting are executed simultaneously with the same way as the above.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a melting apparatus and a melting method for melting scrap and other molten raw materials into molten steel and further refining the molten steel.

[Conventional technology]

An example of this type of equipment is an arc furnace. In an arc furnace, the molten raw material charged into the furnace is heated by a heating electrode and melted there. Once the melting is complete and the steel has become molten steel, the molten steel is refined in the same furnace. After the refining is completed, molten steel is discharged from the furnace and one charge is completed. [Problems to be Solved by the Invention] In this conventional melting device and method, melting is first performed in one chamber, and then different types of work, that is, refining work, are performed in the same room. For this reason, there was a problem in that these tasks were extremely complicated. Furthermore, due to its complexity, there was also the problem that productivity was relatively low. The present invention has been made in view of the above points, and its purpose is to facilitate the disparate operations of melting and refining, and to improve productivity. The objective is to learn the melting equipment and method used. [Means for Solving the Problems] In order to achieve the above object, the present invention takes the measures as described in the claims above, and its effects are as follows.

[Effect]

In the first chamber, the raw material is melted.

On the other hand, in the second chamber, molten steel is refined.

When the refining in the second chamber is completed, the molten steel there is discharged, and then the molten steel melted in the first chamber flows into the second chamber. In the first chamber, newly melted raw materials are melted, while in the second chamber, the molten steel that has flowed in is refined. [Example] Below, drawings showing examples of the present application will be described.

In Figure 1, 1 indicates the melting device. Reference numeral 2 denotes a furnace body in the melting apparatus, which is provided on a furnace stand 3 so as to be freely tiltable. The inside of the furnace body 2 is divided into a first chamber 4, which mainly melts molten raw materials, and a second chamber 5, which mainly refines molten steel. A weir 6 is provided as an example of a partition to prevent molten steel in the first chamber from flowing into the second chamber. Further, above the weir 6, a hanging wall 7 is provided to separate the atmospheric spaces above the hearth in each of the first chamber 4 and the second chamber 5. Next, the configuration provided in the furnace body 2 on the side of the first chamber 4 will be explained. IO is an upper electrode provided in the upper part of the first chamber, and is supported by a well-known electrode support device 11 so as to be vertically movable. 12 indicates a hearth bottom electrode provided on the hearth 4a. These electrodes10. 12 is an example of a heating electric scraper in the first chamber 4, and these are connected to a power supply device not shown. Above-mentioned upper electrode 10 and hearth bottom electrode 1
Each number of 2 is 1 or 2 or more. Furthermore, as the above power supply device, an AC power supply device or a DC power supply device can be used as desired. 13 is a melt provided on the side of the hearth 4a;
In the retention area for melted raw materials, the melted raw materials retained there are transferred to the hearth 4a.
A feeding device l4 is provided to feed the liquid upward. 15 is an inlet for melted raw materials provided in the ceiling part (or side wall) of the furnace body 2 above the retention part l3;
A chute 16 is connected to feed melted raw materials such as scrap. Reference numeral 17 denotes a gas discharge hole, which is connected to the hearth 4 so that the gas in the first chamber 4 can be discharged through the retention section 13.
The retention section 13 is provided at a location separated from the space above a. In this example, the inlet port 15 is commonly used, and the chute 16 is commonly used as a duct for discharging exhaust gas. Note that the gas discharge hole 17 may be provided at a location other than the inlet 15, for example, in the side wall as indicated by the reference numeral 17°.

Next, the configuration provided in the furnace body 2 on the second chamber 5 side will be explained. 20 is an upper electrode, 2l is an electrode support device, and 22 is a bottom electrode. These are equivalent to those in the first chamber. Furthermore, the upper electrode 2o and the hearth bottom electrode 22
is connected to another power supply device different from that of the first chamber 4. Reference numeral 23 denotes a molten steel discharge port provided in a part of the hearth 5a, which is closed by a lid 24 that can be opened and closed. Next, 26 is a tilting device exemplified as an inflow control means, for example, a hydraulic cylinder is used. This tilting device 26 is capable of tilting the furnace body 2 in the direction of an arrow 27 using the furnace stand 3 as a fulcrum. Next, melting and refining of the melted raw material by the melting device 1 will be explained based on FIG. 2. As shown in FIG. 2(A), the dissolved raw material A is fed into the retention section 13 from the feed port 15. This feeding is performed continuously or intermittently. The dissolved raw material A on the retention section 13 is transferred to the delivery device 14.
is sent above the hearth 4a, heated by the arc 30 emitted from the upper electrode IO, and melted into molten steel B. As the above operations are performed continuously or intermittently, a large amount of molten steel B accumulates on the hearth 4a, and a part of it begins to flow over the weir 6 and onto the hearth 5a in the second chamber 5. floor 5a
When a certain amount has accumulated at the top, the furnace body 2 is tilted by the tilting device 26, and the molten steel B in the first chamber 4 flows into the second chamber 5 through the weir 6, as shown in FIG. B) Set the state as shown in . If this situation occurs, the first room 4
Then, the same melting operation as above was performed again and the melting process as shown in Fig. 2 (B
), a new molten steel C is formed. On the other hand, in parallel with this, in the second chamber 5, the above-mentioned molten steel B
is heated by an arc 31 emitted from an electrode 20,
Refining, adjusting ingredients and raising temperature are performed. In the case of this refining work, since the scene of the first chamber 4 is lowered, the melt 1i during refining is
Is molten steel C, which has just been melted in the first chamber, in ft B? j
Therefore, the molten steel B in the second chamber 5 can be of high quality. When the refining of the molten steel B is completed as described above, the M24 is opened and the refined molten steel B is discharged from the discharge port 23 as shown in FIG. 2(C). After that, the discharge port 23 is closed again by the lid 24, and the furnace body 2 is tilted by the tilting device 26, so that the molten steel C newly melted in the first chamber 4 flows into the second chamber 5, and then The state is the same as that shown in FIG. 2(B) above. In this state, new melting raw material is further melted in the first chamber 4, and molten steel is refined in parallel with this in the second chamber 5.

By repeating the above operations one after another, melting and refining of the melted raw material can be performed as if continuously.

When performing the above-mentioned work, the high temperature gas produced in the second chamber 5 flows into the first chamber 4, passes through the retention section 13 together with the high temperature gas there, and is discharged from the gas discharge hole 17. Therefore, the melted raw material A in the retention section 13 can be preheated by the high temperature gas.

Further, the dust generated in the second chamber 5 and the first chamber 4 is discharged from the gas discharge hole 17 together with the exhaust gas. Therefore, it is only necessary to treat the dust in the gas discharged from the exhaust hole 17, and the treatment is easy.

Next, FIG. 3 shows a different embodiment of the present application, in which the weir 6e
A recess 33 is provided in a part of the chamber to allow the molten steel in the first chamber to flow toward the second chamber, and the recess can be opened and closed by a movable weir 34 that can move up and down, which is exemplified as an inflow control means. An example is shown below. Above movable weir 3
4 is formed to have a water-cooled structure, for example, and is normally positioned to close the recess 33.

In order to cause the molten steel in the first chamber to flow into the second chamber, the movable weir 34 is raised by a well-known opening/closing device not shown, and the recess 33 is opened to allow the molten steel to flow through the recess 33. Can be done. [Effects of the Invention] As described above, in the present invention, when it is desired to melt raw materials, refine molten steel, or both, the first chamber 4 and the second chamber 5 can be used to perform both. There are effects that can be achieved.

Moreover, when refining the melted raw material after melting, the first chamber 4
The raw materials are melted in the chamber, and the melted molten steel is flowed into the first chamber 4 and the adjacent second chamber 5, where it is refined.The first chamber 4 is used only for melting, and the second chamber 4 is used exclusively for melting. In No. 5, only refining can be performed exclusively, which has the effect of eliminating the complexity of performing different operations such as melting and refining in one place as in the prior art.

In addition, if you want to improve operational efficiency,
By flowing the molten steel into the second chamber 5 and refining there, and melting the raw material again in the empty first chamber 4, melting work and refinement work can be performed simultaneously. This also has the effect of greatly increasing productivity.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a schematic longitudinal sectional view of a melting device, FIGS. 2 (A) to (C) are diagrams for explaining melting and refining operations, and FIG. Partial perspective view showing different embodiments. A: Melted raw material, B, C: Molten steel, 4: First chamber,
5...Second room, 10, 12, 20. 22... Heating electrode, 13... Retention part, 15... Inlet port 23...
··Vent.

Claims (1)

[Claims] 1. A first chamber equipped with an inlet for feeding molten raw material and a heating electrode for heating the fed molten raw material for melting, and a first chamber for heating molten steel for refining. A second chamber equipped with a heating electrode for heating and a discharge port for discharging the refined molten steel is provided adjacent to the second chamber, and between them, the molten steel in the first chamber is transferred to the second chamber. A melting method characterized in that a partition is provided to prevent the molten steel from flowing into the first chamber, and an inflow control means is provided to cause the molten steel in the first chamber to flow into the second chamber through the partition. Device. 2. A first chamber equipped with an inlet for feeding molten raw materials and a heating electrode for heating the fed molten raw materials for melting, a heating electrode for heating molten steel for refining, and a refining chamber. A second chamber is provided adjacent to the second chamber equipped with an outlet for discharging the molten steel. 2
After the refining in the chamber is completed, the molten steel in the second chamber is discharged from the discharge port, and then the molten steel melted in the first chamber is made to flow into the second chamber, and in the first chamber, the molten steel is again discharged. A melting method characterized in that the molten steel is melted, while the molten steel is refined in the second chamber. 3. A first chamber equipped with an inlet for feeding molten raw materials and a heating electrode for heating the fed molten raw materials for melting, a heating electrode for heating molten steel for refining, and a refining chamber. The second chamber is provided adjacent to the second chamber provided with the discharge port for discharging the melted molten steel, and the first chamber has a retention section for retaining the molten raw material sent from the inlet. ,
A melting device characterized in that a gas discharge hole is provided for discharging the gas in the first chamber through the retention section.