JP2862789B2 - Granular material input device in metal refining furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for feeding powder, particularly high-temperature powder, into a metal bath in a metal refining furnace such as a converter or a smelting reduction furnace.

[0002]

2. Description of the Related Art In a metal bath such as a converter or a smelting reduction furnace, various kinds of auxiliary raw materials and ferroalloys are charged for the necessity of metal refining and the adjustment of components. . Conventionally, most of these auxiliary raw materials and ferroalloys are lump-shaped, and since they are not blown off by the exhaust gas of the refining furnace at the time of charging, the auxiliary materials fixed to the hood above the refining furnace are provided. The raw material had been charged into the furnace from above the furnace port through a charging chute.

However, recently, from the viewpoint of cost reduction, the ore of the granular material has not been subjected to the preliminary treatment for agglomeration, and the granular ore has been directly supplied to the metal refining furnace. . The following two methods are known as a method of throwing such a granular material from a bath surface into a high-temperature metal bath.

[0004] That is, one is to open a charging port in the upper part of the furnace body wall or in the exhaust gas hood, connect a powder charging chute to the opening, and drop the powder from the charging port by gravity. It is a method to throw in. However, in this method, a part of the particles is scattered by the gas generated from the metal bath, and the whole amount is not effectively put into the bath. It is discharged from the exhaust hood.

The other is a method in which powder and granules are charged into a furnace together with a carrier gas through an elevating type loading lance similar to an oxygen blowing lance in a converter. In this method, since the charging port at the front end is moved up and down, the amount of powder to be charged into the furnace is increased as compared with the former method, but the powder is charged due to the heat resistance problem of the powder transfer hose. There is a problem that the maximum temperature of the powder is restricted. In order to solve the above problem, Japanese Utility Model Laid-Open No. 2-66661 discloses a method of “fixing and disposing a raw material transfer pipe 32 from above a molten metal furnace 31 to immediately above an opening of the furnace, as shown in FIG. Below that, a raw material charging pipe 33 is fitted to the raw material transfer pipe 32 and disposed, and the upper part of the raw material charging pipe 33 is held by the lifting carriage 34, and the carriage 34 is hoisted via the hanging wire 35. Connected to the winch 36, the carriage 34 has a guide wheel 37, and by rotating the winch 36,
The carriage 34 moves up and down in the vertical direction while the guide wheel 37 moves along the guide rail 38, and the cooling water pipes 39 and 40 are connected to the upper part of the raw material charging pipe 33. Is disclosed.

[0006] However, in the powder and granular material charging apparatus of FIG.
The weighing hopper 41 is located obliquely above the raw material transfer pipe 32, and the position of the weighing hopper is very high. For this reason, when a building for accommodating a metal smelting furnace is newly constructed, the height of the building becomes abnormally high, and the construction cost including the crane and other related facilities when the building is newly constructed becomes extremely high. As a matter of course, it is not possible to add a granular material charging device having a configuration as shown in FIG. 5 to an existing building where height restrictions are more severe.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to reliably remove powder and granules from a position above a bath surface in a metal bath in a metal refining furnace. It is an object of the present invention to provide a powder and granular material charging device in a metal smelting furnace that can be charged into a furnace.

[0008] It is another object of the present invention to provide an apparatus for charging a granular material in a metal smelting furnace having a compact structure with a reduced overall height.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a powder and granular material feeding device for supplying a powder and a granular material cut out from a weighing hopper to a molten metal in a metal refining furnace via a transfer device. Further, a first aspect of the present invention is a powder and granule charging device in a metal refining furnace, which is provided with a powder and granule charging mechanism having the following features subsequent to the transfer device.
The powder material feeding mechanism includes an inner cylinder having a supply port for the powder material at an upper end thereof, and an outer cylinder having a water-cooled structure fitted to the inner cylinder so as to be movable up and down, and an outer cylinder holding the outer cylinder. An inner cylinder carriage for holding the inner cylinder is disposed on the carriage, a stopper for locking the inner cylinder carriage is provided at a fixed height, and both carriages can be simultaneously moved up and down above the stopper, and below the stopper. In the above, only the outer cylinder carriage can be moved up and down. Further, in the first aspect of the present invention, the connecting device capable of connecting the outlet of the transfer device and the supply port at the upper end of the inner cylinder is rotatably provided at the outlet of the transfer device. The body input device is a second invention. Further, in the first or second invention, the powder feeding device in the metal refining furnace is characterized in that the transfer device has a vertical transfer portion and a horizontal transfer portion following the horizontal transfer portion. And

[0010]

According to the first aspect of the present invention, the inner cylinder carriage is locked by the stopper provided at a predetermined height, and only the outer cylinder carriage is moved up and down below the stopper, so that metal can be removed. Since the lower end of the outer cylinder can be brought closer to the metal bath surface in accordance with the bath surface height, the rate of charging the granular material into the metal bath becomes extremely high. Moreover, if the inner diameters of the inner cylinder and the outer cylinder are appropriately formed according to the size of the granular material, the granular material having a wide particle size distribution from coarse particles to fine powder can be surely put into the metal bath. . Further, according to the powder and granule charging device of the second invention, since the connecting device is not fixed but rotatable, the furnace is tilted to discharge the molten metal in the furnace, and maintenance of the furnace is performed. In this case, by rotating the connection device to a position where there is no interference with the inner cylinder, a space is created immediately above the inner cylinder, so that the granular material charging mechanism can be raised to a required height. In this way, the space above the inner cylinder can be effectively used, and the height of the device can be reduced.

According to the third aspect of the present invention, since the transfer device and the weighing hopper can be arranged in the horizontal direction, the position of the weighing hopper does not become abnormally high, and the overall height of the device is reduced. Can be further reduced.

[0012]

FIG. 1 is a side view of a powder and granular material charging apparatus for a metal refining furnace according to the present invention. In the figure, reference numeral 1 denotes a metal smelting furnace (smelting reduction furnace) for steelmaking, and a metal smelting furnace 1 holds a metal bath (iron bath) 2 therein, and stores iron ore (preliminary reduced iron described below) therein. The iron ore is charged together with coal, lime, etc., and blown with oxygen (and nitrogen for stirring) to reduce the iron ore in a molten state to obtain pig iron. Since a high-temperature reducing gas containing CO is generated from the metal bath 2, the high-temperature reducing gas is transferred from the elevating hood 4 covering the furnace body upper opening 3 to the duct 5.
The iron ore is supplied to a pre-reduction furnace (not shown) for iron ore, and the high-temperature (about 700 ° C.) pre-reduced iron ore is preliminarily reduced in contact with the gas in the pre-reduction furnace. And sent to the metal smelting furnace 1.

[0013] In order to pour raw materials such as coal and lime, etc. into the metal bath 2 from above, in addition to the preliminary reduced iron,
In the present embodiment, the powder material feeding mechanism 6 is provided above the metal bath 2. The detailed configuration of the granular material feeding mechanism 6 will be described below. "Powder / Particle Injection Mechanism" An outer cylinder holding an outer cylinder 9 having an inner cylinder 8 having a supply port 7 for powder and granular material at an upper end thereof and an outer cylinder 9 fitted to the inner cylinder 8 so as to be movable up and down. An inner cylinder carriage 11 for holding the inner cylinder 8 is arranged on the carriage 10. 9a, 9b
Are a water supply port and a water discharge port for cooling water for cooling the outer cylinder, respectively. The pulley 12 (FIG. 2) attached to the outer cylinder carriage 10
And the elevating winch 13 are connected via a wire 14. Each of the outer and inner carriages 10, 11 has a guide roller 15, and the guide roller 15 moves up and down along a guide rail 16. (See Figure 2)
The guide roller 15 is guided by the guide rail 16 by operating the elevating winch 13 to adjust the feeding amount of the wire 14 (see FIG. 2).
1 can be moved up and down at the same time while being mounted on the outer cylinder carriage 10. However, the inner cylinder carriage 11
Is provided with a projection 17, which is locked by a stopper 18 provided at a fixed height, and the inner cylinder carriage 11 stops on the stopper 18, and moves below the stopper 18. Can not. That is, above the stopper 18, the inner cylinder carriage 11 is placed on the outer cylinder carriage 10 and can move up and down at the same time, but below the stopper 18 only the outer cylinder carriage 10 moves up and down. Can be. The above is the details of the granular material feeding mechanism.

Next, an apparatus at the front of the granular material feeding mechanism will be described. 19 is a weighing hopper for the granular material to be charged, 20 is an electromagnetic feeder for quantitatively cutting out the granular material,
21 is a sealing material, 22 is a conveyor for transporting the granular material, and the conveyor 22 is a horizontal transport section 22a, a vertical transport section 22.
b, a horizontal transport section 22c. Reference numeral 23 denotes a connection device which can connect the supply port 7 at the upper end of the inner cylinder and the outlet 24 of the conveyor 22. The connection device 23 has an expansion joint 26 and an air cylinder 27 at the lower end of the oblique pipe 25, and a rotary actuator 28. Thereby, the connection device 23 can rotate.

The powder and granule charging apparatus according to the present invention having the above-described structure is operated as follows to operate the weighing hopper 19.
The granular material therein can be put into the metal bath 2 of the metal refining furnace 1.

First, as shown in FIG. 1 and FIG.
The water cooling of the outer cylinder 9 is started while the cooling water is passed through a and discharged from the drain port 9b. Next, the elevating winch 13 is driven, and the guide roller 15 is guided by the guide rail 16 while the inner cylinder carriage 11 is lowered on the outer cylinder carriage 10 at the same time.

After that, as shown in FIG. 3, the projection 17 provided on the inner cylinder carriage is locked by the stopper 18, and the inner cylinder carriage 11 stops on the stopper 18. Here, the rotary actuator 28 is driven to rotate the connecting device 23, and the expansion joint 26 is expanded and contracted by the air cylinder 27 to connect the lower end of the connecting device 23 to the supply port 7 at the upper end of the inner cylinder 8. .

Then, as shown in FIG. 4, the inner cylinder carriage 11 is stopped in a state of being placed on the stopper 18, and the lifting winch 13 is further driven to lower only the outer cylinder carriage 10. On the other hand, while the powder and the granular material are cut out from the weighing hopper 19 by the electromagnetic feeder 20, the powder and the granular material are sent to the entrance of the connection device 23 through the horizontal transport section 22 a, the vertical transport section 22 b and the horizontal transport section 22 c of the conveyor 22. The powder is passed through the oblique pipe 25 of the connecting device 23 by its own weight, and sequentially passes through the supply port 7 at the upper end of the inner cylinder, the inside of the inner cylinder 8 and the inside of the outer cylinder 9, so that the powder and granules are transferred to the metal bath 2. Spray. As shown in FIG. 4, the surface of the metal bath 2 facing the front end portion 9 c of the outer cylinder 9 is lowered, and the outer cylinder 9 is further lowered accordingly. In this manner, the powder can be reliably introduced into the metal bath 2.

When the operation of the metal smelting furnace 1 is completed and the metal smelting furnace 1 is tilted to discharge the molten metal to the outside or when the inside of the smelting furnace is maintained, the connecting device 23 is rotated by the rotary actuator 28. As a result, there is no obstacle on the upper part of the inner cylinder carriage 11, so that the lifting winch 13 is driven again to raise both the outer cylinder carriage 10 and the inner cylinder carriage 11, and the position of the tip 9c of the outer cylinder 9 is changed to the duct. Raise to around 5. Thus, the connection device 23
Is not a fixed type but has a structure that can rotate as required, so that the height of the apparatus can be reduced by effectively utilizing the upper space of the inner cylindrical carriage 11. At this time, if the elevating hood 4 is also raised at the same time, the tilting of the metal smelting furnace 1 is not hindered.

Further, since the conveyor following the weighing hopper 19 is composed of the horizontal transport section 22a, the vertical transport section 22b, and the horizontal transport section 22c, the weighing hopper 19 and the conveyor 22 can be arranged in the horizontal direction. Does not become very high, and the overall height of the apparatus can be further reduced.

Although the embodiment of the present invention has been described with reference to the drawings, a carrier gas may be used as a method for charging the granular material. Further, the granular material charging apparatus of the present invention can be widely applied not only to a smelting reduction furnace but also to a metal smelting furnace in which gas is generated from the furnace, such as a converter. It goes without saying that it is not limited to a metal smelting furnace for steelmaking.

[0022]

Since the present invention is configured as described above, the following effects can be obtained. According to the first aspect of the present invention, the outer cylinder fitted to the inner cylinder can be freely raised and lowered, and the lower end thereof can be moved to a position corresponding to the height of the metal bath. The granular material can be reliably introduced into the metal bath from above the bath surface.

According to the second or third aspect of the present invention, it is possible to provide a compact and granular material charging apparatus having a reduced overall height.

[Brief description of the drawings]

FIG. 1 is a side view showing a case where a powder and granular material charging device of the present invention is in a standby state.

FIG. 2 is a view taken in the direction of arrows II-II of the granular material introduction device of FIG.

FIG. 3 is a side view showing a state in which the outlet of the transfer device of the powder and granular material feeding device of the present invention and the supply port at the upper end of the inner cylinder are connected by a connecting device.

FIG. 4 is a side view showing a state in which a granular material is charged by the granular material charging device of the present invention.

FIG. 5 is a side view of a conventional granular material charging device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal refining furnace (melting reduction furnace) 2 ... Metal bath (iron bath) 3 ... Opening of furnace upper part 4 ... Elevating hood 5 ... Duct 6 ... Powder and granule charging mechanism 7 ... Supply port 8 ... Inner cylinder 9 ... Outer Cylinder 9a: Water supply port 9b: Drain port 9c: Tip portion 10: Outer cylinder carriage 11 ... Inner cylinder carriage 12 ... Pulley 13 ... Elevating winch 14 ... Wire 15 ... Guide roller 16 ... Guide rail 17 ... Projection 18 ... Stopper 19 ... Weighing hopper 20 ... Electromagnetic feeder 21 ... Seal material 22 ... Conveyor 22a, 22c ... Horizontal transport unit 22b ... Vertical transport unit 23 ... Connecting device 24 ... Outlet 25 ... Pipe line 26 ... Expansion joint 27 ... Air cylinder 28 ... Rotary actuator 31 ... Molten metal furnace 32 ... Raw material transfer pipe 33 ... Raw material charging pipe 34 ... Elevating carriage 35 ... Suspension wire 36 ... Hoisting winch 37 ... Guide wheel 3 8. Guide rails 39, 40 ... Cooling water piping 41 ... Weighing hopper

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Manabu Sakamoto 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Akira Ichihara Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba No. 1 Kawasaki Steel Corporation Chiba Works (72) Inventor Shunji Hamada 1 Kawasakicho, Chuo-ku, Chiba-shi, Chiba Prefecture Kawasaki Steel Corporation Chiba Works (72) Inventor Keizo Taoka 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Takashi Kuroki 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Yuki Nabeshima 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel (56) References JP-A-7-138630 (JP, A) JP-A-63-194296 (JP, U) Shokai Sho 56-151931 (JP, U) Shoko Sho 55-50558 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) C21C 5/46 C21C 7/04 F27D 3 /Ten

Claims (3)

(57) [Claims] An apparatus for feeding powder and granules cut out from a weighing hopper to a molten metal in a metal refining furnace via a transport device, wherein the powder device has the following characteristics following the transport device. A powder and granule charging device in a metal smelting furnace, wherein a granule charging mechanism is provided. An inner cylinder having a supply port of the granular material at an upper end portion, and an outer cylinder of a water-cooled structure which is fitted to the inner cylinder so as to be movable up and down, and the inner cylinder is mounted on an outer cylinder carriage holding the outer cylinder. Arrange the inner cylinder carriage to hold, provide a stopper at a certain height to lock the inner cylinder carriage,
A powder and granular material feeding mechanism in which both carriages can move up and down simultaneously above the stopper, and only the outer cylinder carriage can move up and down below the stopper. 2. A powder in a metal smelting furnace according to claim 1, wherein a connecting device capable of connecting the outlet of the transfer device and the supply port at the upper end of the inner cylinder is rotatably provided at the outlet of the transfer device. Granule input device. 3. The apparatus according to claim 1, wherein the transfer device has a vertical transfer portion and a horizontal transfer portion following the horizontal transfer portion.