JPH05125423A - Device for charging raw material in cylindrical furnace - Google Patents

Abstract

PURPOSE:To provide a device for smoothly charging raw material from an opening at the upper part of a cylindrical furnace without largely tilting the furnace. CONSTITUTION:(1) A raw material charging device in the cylindrical furnace is provided with a trough type vessel 1 having U-shaped cross section, a pushing- out plate 2 shifting from one end to the other end of the vessel along the inner periphery and mechanism (ball screw 4, etc.) for driving this pushing-out plate. (2) This device is provided with rollers arranged at the bottom part of the vessel 1 or the bottom part and the side parts. (3) Further, this device is provided with the roller and the pushing-out plate at the same time. As the raw material can be charged without largely inclining the raw material charging device, a little tilting of the furnace body may be enough. The raw material can be charged at high packing ratio without interfering with the attached equipment of the furnace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for charging raw materials such as scrap, iron ore, coke and the like into a converter or a cylindrical furnace similar thereto from the upper opening thereof.
In particular, the present invention relates to a raw material charging device that can perform charging smoothly even when the tilting of the furnace body is small.

[0002]

2. Description of the Related Art In a furnace for charging raw materials from an upper opening such as a steelmaking converter, it is usual to tilt the furnace body to charge the raw materials. This is because the auxiliary equipment such as the exhaust gas hood will be an obstacle if the charging is performed while standing upright.

FIG. 4 is a schematic sectional view for explaining charging of raw materials into a conventional converter. The raw material is a boat-shaped (gutter-shaped) container with one end open at a certain place (usually called raw material bag)
The raw material bag 41 is housed in a container 41 and is hung by a crane as shown in the figure to be carried near the opening of the tilted furnace.
Is operated to incline, and the raw material therein is dropped into the furnace and charged. At the upper part of the furnace, there are a hood 43 for collecting exhaust gas when the furnace is in operation and a hood for collecting dust when charging raw materials (pre-furnace dust collecting hood) 44. At the lower end of the exhaust gas hood 43, there is a water-cooled skirt portion 43a that moves up and down, and when the furnace stands upright, it descends and comes into contact with the furnace mouth. A part of the lower end of the furnace front hood 44 has a chain structure 44a so that the material bag can be easily approached.
Has become. Even with the above structure, it is necessary to tilt the furnace body at a tilt angle of 50 ° or more to avoid the interference with these incidental equipment and to smoothly charge the raw materials. In addition, the raw material filling rate in the furnace becomes extremely low.

Further, the raw material bags used conventionally are
Since it is a simple gutter shape made of a flat steel plate, and the raw material only slides along the inside, the raw material bag itself must be tilted greatly when charging. This is also one of the reasons why the furnace must be largely tilted,
In addition, the material bag has a small capacity for the convenience of the crane operation, and the material charging must be carried out in multiple times.

At present, most of pig iron is produced by a blast furnace. In this blast furnace pig iron method, sinter ore is used as an iron source and high-grade coke is used as a fuel (reducing material). There are restrictions on the available raw fuel. Further, the blast furnace in recent years has become enormous, and since it is not possible to easily stop and restart it once it has been fired, it lacks flexibility in responding to changes in demand for steel products.

In order to solve the above-mentioned problems of the conventional blast furnace ironmaking method, the present applicant uses a cylindrical furnace similar to a converter for steelmaking, and uses a new manufacturing method using ore and scrap as iron sources. A pig iron method was invented (see, for example, JP-A-1-290711). Figure 3 shows a cylindrical furnace used in this new ironmaking process.
FIG. 3 is a schematic sectional view showing a charging state of 31 and its raw material. This furnace
As shown in the drawing, 31 is an opening 32 for discharging the gas in the furnace and charging the raw material in the upper part of the furnace, a primary tuyere 33 for injecting a combustion-supporting gas and fuel as needed in the lower part of the furnace wall, and its upper furnace wall A secondary tuyere 34 for injecting a combustion-supporting gas into the inside of the furnace, and an outlet 37 for discharging hot metal and slag are provided at the bottom of the furnace.

In order to produce hot metal using the cylindrical furnace 31, first, a coke packed layer 35 is provided in the lower part of the furnace, and scrap 36-1, iron ore 36-2, and auxiliary materials such as slag forming agent are provided thereon. To form the filling layer 36. Then, a combustion supporting gas and fuel as necessary are blown into the lower coke packed layer 35 from the primary tuyere 33 to cause a reaction of the following equation (1), and the reaction heat keeps the coke packed layer 35 at a high temperature.

C ＋ 1 / 2O ₂ → CO ＋ 29,400kcal / kmol ・ C ・ ・ ・ (1) The CO generated in the above equation (1) is blown from the secondary tuyere 34 in the packed layer 36 of scrap and iron ore. Flammable gas and below
The reaction of formula (2) (secondary combustion) occurs. The heat of reaction is used for heating and melting scrap 36-1 and iron ore 36-2.

CO + 1 / 2O ₂ → CO ₂ +67,590 kcal / kmol CO (2) The iron ore (molten iron oxide) melted by this reaction is dropped into the coke packed bed 35 at the bottom to form high temperature coke. It reacts according to the following formula (3) and is immediately reduced.

Fe ₂ O ₃ + 3C → 2Fe + 3CO −108,090 kcal / kmol · Fe ₂ O ₃ (3) Since CO ₂ does not exist in the vicinity of the reaction of the above formula (3),
CO ₂ does not interfere with the reaction of formula (3). And
The CO generated by the equations (1) and (2) is secondarily combusted in the packed bed 36 of scrap and iron ore, so that it is effectively used for heating and melting them and high fuel efficiency is achieved.

As described above, according to the above-described method for producing hot metal, which the present applicant has previously proposed, hot metal can be continuously produced from scrap and iron ore with good thermal efficiency in a converter-type tubular furnace. However, in actual operation, it is important to increase the filling rate of the raw material in the cylindrical furnace in order to improve the thermal efficiency and improve the productivity. However, even in the case of such a furnace, it is necessary to install an exhaust gas hood, a dust collecting hood and the like as shown in FIG. Therefore, the filling rate of the raw material cannot be increased. Also,
Conventional raw material bags with a small capacity require a large number of charging operations, resulting in extremely poor operating efficiency.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus capable of smoothly and promptly charging raw materials even if the tilting angle of a cylindrical furnace is reduced, and thus increasing the raw material filling rate in the furnace. Another object of the present invention is to provide a device capable of further increasing the capacity and increasing the efficiency of charging work.

[0013]

The gist of the present invention is as follows.
(1) In the raw material charging device of (2) and (3).

(1) A trough-shaped container having a U-shaped cross section, and an extrusion plate that moves from one end of the container to the other end along the inner circumference thereof.
A raw material charging device for a tubular furnace, comprising: a mechanism for driving the extruded plate.

(2) A raw material charging device for a tubular furnace, which comprises a trough-shaped container having a U-shaped cross section and a bottom portion of the container, or rollers arranged at the bottom portion and the side portion.

(3) A trough-shaped container having a U-shaped cross section, a bottom of the container, or rollers arranged at the bottom and sides of the container, and from one end of the container to the other end along the inner circumference of the container. A raw material charging device for a tubular furnace, comprising a moving extrusion plate and a mechanism for driving the extrusion plate.

FIG. 1 shows an example of the raw material charging apparatus of the present invention of the above (1), (a) is a side view, (b) is (a).
It is an AA arrow cross-sectional view of the figure. As shown in the figure, this raw material charging device includes a container 1 having a U-shaped cross section,
It has a raw material extruding plate 2 which moves along its inner circumference. The raw material extruding plate 2 has an overhanging portion 3 on the upper side thereof, which overhangs the both side ends of the container opening portion, and the upper guide 7 and the lower guide 8
Is slidably locked between. The overhanging portion is screwed onto the ball screw 4, and the rotation thereof causes the raw material extruding plate 2 to move forward and backward as indicated by a broken line and a dashed line in FIG.

The front and rear ends of the ball screw 4 are rotatably supported via bearings 5 and are reversibly rotated by a drive mechanism 6 at the rear end of the container. As the drive mechanism, for example, a motor with a speed reducer can be used. That is, the push plate 2 is moved back and forth by a predetermined distance as the ball screw 4 is rotated by starting the motor. The moving stroke of the raw material extruding plate 2 can be freely changed depending on the length of the ball screw 4. Even if the ball screw 4 is not provided over the entire length of the container, if the container is slightly tilted and the material is pushed by the extruding plate at the initial charging of the material, the material can be charged by its own weight drop thereafter. 1 and 2, 9 is a crane hook and 10 is a reinforcing material.

FIG. 1 (c) is a sectional view similar to FIG. 1 (b) showing a modified example in which the material pushing force is increased.
In this case, a ball screw 4 is also installed at an appropriate place below the extrusion plate 2, and the protrusion 3 of the raw material extrusion plate is attached to this ball screw.
Are screwed together. If this ball screw is driven in synchronization with the ball screw on the upper side, the push-out plate 2 is driven evenly up and down, and even if there is a large amount of raw material in the container, it can be pushed out smoothly.

The mechanism for driving the push-out plate is not limited to the ball screw system. For example, a hydraulic cylinder may be used to move the extrusion plate back and forth. In this case, hydraulic cylinders may be installed on both sides of the upper opening of the container 1, and the tip of the rod may be fixed to the overhanging portion 3 of the extruding plate 2. The hydraulic unit, which is the hydraulic pressure generation source for the hydraulic cylinder at this time, may be placed on the crane and connected to the hydraulic cylinder of the raw material charging device when charging the raw material.

FIG. 2 is a view showing an embodiment of the device of the present invention of the above (2). (A) is a side view, (b) is a cross sectional view taken along the line AA, and (c) is (b). ) An enlarged sectional view of a C portion surrounded by a broken line in the figure, (d) is a sectional view taken along the line D-D of the figure (b).

In this apparatus, rollers 20 are arranged on the bottom surface and side surfaces of the container 1 at appropriate intervals. However, the rollers may be arranged only at the bottom. As shown in FIG. 2D, a spacer 22 is attached to the container bottom plate 21.
Is fixed and the roller 20 is attached so that the upper surface thereof protrudes. When a roller is provided on the side of the container as well, as shown in FIG.
Support at 23. The support for the bottom roller is similar.

The device (3) of the present invention is a combination of the structures (1) and (2) described above although not shown. That is, it is provided with the pushing plate 2 as shown in FIG. 1 and the roller 20 as shown in FIG. In the apparatus, raw material can be charged with a slight driving force of the extrusion plate.

[0024]

The operation of charging raw materials such as coke, scrap, ore and the like into the converter type cylindrical furnace using the raw material charging apparatus of the present invention will be described. First, a raw material charging device containing raw materials at a predetermined location is lifted by a crane through a crane hook hook 9 and conveyed to a furnace position in a substantially horizontal state. Then
The furnace is tilted as shown in FIG. 4, but in this case, the tilt angle may be as small as 30 ° or less. And the tip of the raw material charging device (Fig. 1 (a) and Fig. 2 (b))
Then, the left end) is exposed to the furnace opening, and the raw material charging is started in a horizontal state or slightly inclined.

In the case of an apparatus equipped with the extrusion plate 2, the extrusion plate is advanced to extrude the raw material in the container 1 and insert it into the furnace. Even in the raw material charging device provided with only the roller 20, the raw material starts sliding and dropping by its slight tilting. In either case, it is sufficient to tilt the raw material charging device,
It is not necessary to tilt the furnace significantly as shown in FIG.

Further, unlike the conventional case, it is not necessary to operate a complicated crane for shaking the container (raw material bag) to start the movement of the raw material.

Needless to say, the drive device for moving the extrusion plate of the raw material charging device of the present invention such as a motor or a hydraulic cylinder can be controlled by remote control.

[0028]

The raw material charging apparatus of the present invention can charge the raw material into the furnace without tilting it or only slightly tilting it. Therefore, the raw material can be charged with almost no tilting of the furnace, so that the raw material can be charged up to the full furnace opening of the furnace body, and the above-described hot metal manufacturing method can be carried out extremely efficiently. Further, since the apparatus of the present invention can have a large capacity, it is possible to charge a large amount of raw material in one charging using a crane having a large capacity for moving a hot metal ladle to shorten the operation preparation time. You can

A further great advantage is that the above-mentioned hot metal production method can be carried out by using existing equipment such as a steelmaking converter and without specially modifying the auxiliary equipment. That is, in the conventional equipment as shown in FIG. 4, the tilting of the furnace can be made small and the raw material as shown in FIG. 3 can be charged to perform hot metal production with high thermal efficiency.

[Brief description of drawings]

1 shows an example of a raw material charging device of the present invention,
(A) is a side view and (b) is a cross-sectional view taken along the line AA of (a). (C) is sectional drawing equivalent to (b) which shows a modification.

2A and 2B show another example of the raw material charging device of the present invention, in which FIG. 2A is a side view, FIG. 2B is a cross-sectional view taken along the line AA of FIG. 2, and FIG. The enlarged sectional view of the C section enclosed with the inside broken line, (d) is a DD sectional view taken on the line of (b) figure.

FIG. 3 is a schematic vertical cross-sectional view illustrating a hot metal manufacturing method using a tubular furnace.

FIG. 4 is a schematic view showing a conventional raw material charging method.

[Explanation of symbols]

1: Container, 2: Raw material extruded plate, 3: Overhang part, 4: Ball screw, 5: Bearing 6: Drive mechanism, 7: Upper guide, 8: Lower guide, 9:
Crane hook hook 10: Reinforcement material, 20: Roller, 21: Container bottom plate, 22:
Spacer, 23: Bearing box 24: Plain bearing, 31: Furnace, 32: Opening, 33: Primary tuyere, 34: Secondary tuyere 35: Coke packed bed, 36 Scrap and ore packed bed, 3
7: Discharge port 41: Material bag, 42: Lifting equipment, 43: Exhaust gas hood, 4
4: Furnace dust collection hood

Claims (3)

[Claims] 1. A trough-shaped container having a U-shaped cross section, an extruding plate that moves from one end to the other end of the container along the inner circumference thereof, and a mechanism that drives this extruding plate. A raw material charging device for a cylindrical furnace. 2. A raw material charging apparatus for a tubular furnace, comprising: a trough-shaped container having a U-shaped cross section, and a bottom portion of the container, or rollers arranged on the bottom portion and the side portion. 3. A trough-shaped container having a U-shaped cross section, a bottom of the container, or rollers arranged at the bottom and sides of the container, and moving from one end of the container to the other end along the inner circumference of the container. And a mechanism for driving the extruded plate. A raw material charging device for a cylindrical furnace, comprising: