JP3811274B2 - Sorting and charging equipment for the center of the blast furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention can maintain the air permeability and liquid permeability of the blast furnace interior in the blast furnace operation, can improve the operation stability, and interferes with the blast furnace charge charging device, particularly the swivel chute in the bell-less blast furnace. The present invention relates to an apparatus for avoiding a collision and holding a normal charging surface and charging a predetermined charged material into a furnace center.
[0002]
[Prior art]
In recent years, with the increase in the size of blast furnaces, pig iron production per blast furnace has increased dramatically. However, in order to maximize the benefits of large-scale blast furnaces, how to maintain stable blast furnace operation How to go is an important issue. Therefore, in operating the blast furnace, various operating conditions must be appropriately adjusted. Among them, it is particularly important to properly manage the distribution of the charged raw materials in the furnace. That is, the ore charged in the furnace is reduced while being heated by the high-temperature reducing gas that rises in the furnace. In order to efficiently perform this heating and reduction, the charged raw materials (including coke) are used. Therefore, it is necessary to supply the reducing gas evenly to all the ores.
[0003]
However, in actual operations, it is difficult to maintain a uniform distribution state due to factors such as the characteristics of the raw material charging equipment and the accumulation characteristics of the charged material. Variations in distribution status due to environmental, chemical fluctuations, or worsening conditions are unavoidable with the current operating law. When the circumferential balance of the ascending gas is lost due to these, a local drift of the reducing gas occurs, resulting in various obstacles.
Therefore, in order to stably maintain the operation even when there is such an unavoidable change in the reactor state, the gas flow in the furnace is not simply dispersed evenly, but a part of the gas flow is transferred to the core portion. Recently, many technologies have been adopted that can concentrate on the above and fulfill the safety valve function against the increase of the gas pressure in the furnace.
[0004]
However, in the normal charging system, both ore and coke are charged and dropped from the furnace wall side, but the repose angle of the ore is smaller than that of coke, so it easily flows to the core side. The thickness ratio (hereinafter simply referred to as O / C) becomes high in the core. In particular, in a blast furnace using pelletized ore, the angle of repose of the pelleted ore is smaller, so the flow of the ore to the furnace center tends to increase, and the O / C in the furnace center tends to be higher. There was a strong demand to reduce the O / C at the center of the furnace.
[0005]
As a most general method for solving the above problems, a method of charging a large amount of coke with good air permeability at the center of the furnace is proposed. Many proposals have been made on a method for charging a blast furnace charge based on such a concept, and an example of the bell type charging device is shown in Japanese Patent Publication No. 6-37649.
On the other hand, in the bell-less charging device, since the charge (coke, ore) is charged by the tilting type turning chute, any position of the furnace center from the furnace wall in the furnace top can be selected by selecting the tilting position of the chute. The charge can be charged to However, if a small amount of coke needs to be charged separately to the center of the furnace in addition to charging the specified unit amount into the blast furnace as described above, a small amount of coke is transported from the storage hopper. Since separate transport is required via the conveyor, there is a disadvantage that the time for charging becomes long.
[0006]
Therefore, in Japanese Patent Publication No. 6-37649, as shown in FIG. 1, another small amount of small hopper 5 is provided at a part of the blast furnace top 1 having a bell type charging device, and the hopper is sorted and charged. A method is used in which a small amount of coke 27 is added and charged into the furnace through the hopper 5. Charging into the furnace is performed by providing a charging pipe 2 inclined toward the furnace center and lowering the coke through the pipe. However, the method proposed in the publication mainly consists of a bell-type blast furnace, and the bellless blast furnace is only disclosed a little about the method.
[0007]
[Problems to be solved by the invention]
In the bell-less charging device, since the swivel chute tilts in the radial direction of the furnace and charges the charged material, the fixed charging tube system described in the above publication mainly composed of the bell-type charging device has the charging tube. Since the swivel chute interferes and collides, a charging pipe cannot be provided. Although it is possible to set the charging pipe below the tilting range of the turning chute, the charging line 30 is lowered as shown in FIG. 2, so that the internal volume of the blast furnace cannot be used effectively. There is a problem.
In this way, in the bell-less blast furnace, only the method is disclosed regarding the charging of the required charge into the center of the blast furnace, and there is no charge charging device only in the center of the furnace suitable for the bell-less blast furnace. It was a development situation.
[0008]
Also, in the bell-type blast furnace, if a coke charging pipe as shown in FIG. 1 is always installed in the blast furnace, the charge falls on the charging pipe during normal charging. If an impact is applied for a long period of time, it will lead to deformation of the charging tube, and the charged material may also be divided by the charging tube and hinder uniform charging.
[0009]
The object of the present invention is to solve the above-mentioned problems. In particular, in a bell-less blast furnace, an effective charging to the center of the blast furnace that does not hinder the turning of the charging charge turning chute is effective. An object charging apparatus is provided.
[0010]
[Means for Solving the Problems]
The gist of the present invention resides in the following means.
[0011]
(1) In order to sort charge of coke, scrap, granular iron, or reduced iron into the furnace center of the blast furnace, the charge for sorting charge is stored around the top of the blast furnace. A vertical charging pipe is rotatably inserted into the blast furnace through the top mantel through a discharge pipe attached to the lower part of the hopper, and a lower end of the vertical charging pipe is installed. A rotary drive mechanism that is fitted to the vertical portion of the inclined charging pipe and is rotated by another gear body that meshes with the gear body that surrounds and fixes the vertical charging pipe. A sorting and charging device for the center of the blast furnace characterized by being attached to the location.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
As described above, the present inventors have conducted various studies on how to develop an appropriate charging device and contribute to blast furnace operation for the charging technology not disclosed in the conventional method as described above. The invention has been successfully developed.
[0013]
Hereinafter, in the present invention, a coke often used in sorting and charging will be described as an example, and the charging device will be described. However, the present invention is not limited to this, for example, scrap, granular iron, reduced iron, etc. Of course, it is included.
[0014]
The apparatus of the present invention exhibits its effect particularly in a bell-less blast furnace with severe installation conditions. However, the installation in the bell-blast furnace is extremely easy as compared with the bell-less blast furnace.
[0015]
The charging device of the present invention has a great feature in that a charging tube inserted into a blast furnace can be rotated in the radial direction of the furnace, and an example of the configuration will be described in detail with reference to the drawings.
[0016]
FIG. 3 is a side view showing an outline of the bell-less blast furnace top charging portion and the apparatus of the present invention, and FIG. 4 is a view showing an outline of the plane in FIG.
[0017]
FIG. 5 is an enlarged view of a part of FIG. 3 and shows details of the movable state of the device of the present invention. FIG. 6 (a) is a view taken along arrows A to A 'in FIG. Yes, it shows the engaged state of the vertical charging pipe, the inclined charging pipe and the rotating pipe.
[0018]
FIG. 6B is a view taken along arrows B to B ′ in FIG. 5 and shows a state where the inclined charging tube is supported by the L-shaped support member.
[0019]
3 to 6, the vertical charging pipe 6 is rotatably installed through the furnace top mantel 3 in the vicinity of the top right of the blast furnace wall. The vertical charging pipe 6 has a charging hopper 5 for storing the coke 27 at the upper part thereof, a shut-off valve 4 is provided at the lower part of the hopper, and a discharge pipe 17 is attached at the lower part thereof. It is installed with its lower end inserted into the vertical charging pipe 6.
[0020]
Further, in order to rotate the vertical charging pipe 6, a gear body 8 a that surrounds and fixes the vertical charging pipe 6 is provided. On the other hand, another gear body 8b that meshes with the gear body 8a is provided on the side of the vertical charging pipe 6, and the gear body 8b is connected to a drive motor 9 as its rotational drive mechanism. An annular support 18 having a fixed leg is fixed to the peripheral portion of the penetration portion of the furnace top mantel 3, and a step portion of the vertical insertion tube 6 is placed on the upper surface of the support 18. Hold the load on the tube 6.
[0021]
Further, the vertical portion of the inclined charging pipe 7 is held inside the support 18, and a rotating pipe 19 capable of separating the inclined charging pipe 7 is provided in an emergency. The rotating tube 19 has a housing 21 protruding on the outer surface, and the housing 21 is placed on an annular receiving shelf 20 provided on the inner surface of the support 18 to hold the rotating tube 19. Further, a bevel gear 22a is fixed to the upper portion of the rotating pipe 19, and the bevel gear 22a meshes with the small bevel gear 22b. The small bevel gear 22b is connected to, for example, the drive motor 11 as a rotation mechanism. The bevel gear 22a is kept out of contact with the vertical charging pipe 6.
[0022]
The upper end of the inclined charging pipe 7 is fitted from the outside to the lower end of the vertical charging pipe 6 inside the rotating pipe 19 and an appropriate number (three or more in this example, three) on the inner surface. The projecting portion 23 of the vertical pipe 6 and the lower end notch portion of the vertical pipe 6 are engaged with each other with a comb-tooth shape. Furthermore, the inclined tube 7 has a protruding plate 24 (two or more, two in this example) on the outer surface of the upper end, and is placed on a support plate 25 provided on the lower inner surface of the rotating tube 19 to load the load. Hold.
[0023]
Further, these devices have a size slightly larger than the width and length of the projecting plate 24 of the inclined charging tube 7 on the same circumference of the support plate 25 of the rotating tube 19 so as to cope with an emergency. A notch 26 is formed, and the vertical charging pipe 6 and the inclined charging pipe 7 can be separated by an operation as described later. The structure described above is covered with a casing 10 except for each drive motor in order to protect it from the external dust environment.
[0024]
Further, the inclined charging pipe 7 has a vertical portion meshing with the vertical charging pipe 6 at the upper portion, and the lower main portion constitutes an inclined portion, and the inclined portion is formed in an arcuate arc shape over almost the entire length. When the inclined charging pipe 7 is in the retracted position, it avoids contact with a turning chute that turns in the furnace, and does not obstruct turning.
[0025]
Further, a support member 14 for receiving a part of the load of the inclined charging pipe 7 is not supported by the rotating pipe 19 at an appropriate position on the lower surface of the inclined portion of the inclined charging pipe 7. The support body 13 is attached to the front end portion thereof, and the inclined charging pipe 7 is supported from the lower surface.
Since the support body 13 receives the rotational force from the vertical charging pipe 6 and must cooperate with the rotational movement of the inclined charging pipe 7, the sectional shape thereof is as shown in FIG. 6 (b). The slant charging pipe 7 has a semi-cylindrical shape slightly larger than the cylindrical shape, and is configured with an appropriate length.
[0026]
By adopting such a configuration, when the inclined charging pipe 7 is rotationally moved, the support body 13 only needs to slide slightly on the lower surface of the inclined charging pipe 7 even if the respective rotation axes are different. Since 13 covers up to about half of the lower surface of the inclined charging pipe 7, the support body 13 is not separated from the inclined charging pipe 7.
Further, the support member 14 is formed in a substantially L-shape, and the upper portion of the L-shape holds these loads by a support fitting 15 that passes through the furnace top mantel 3 and is attached to the furnace top mantel. . In this case, the support member 14 is preferably held by a spring body 16 (spring) built in the support metal fitting 15, and can flexibly cope with vibration or displacement received by the inclined charging tube 7.
[0027]
Further, the inclined portion of the inclined charging pipe 7 has a depression angle of 40 ° or more so that coke outflow can be smoothly dropped by its own weight in consideration of the repose angle of the coke.
Furthermore, if the inclined charging pipe 7 has a downcomer pipe 12 perpendicular to the furnace at its lower end, it is convenient to keep the coke dropping position within a predetermined range.
[0028]
Hereinafter, an outline of the operation of the apparatus of the present invention will be described together with the operation.
The rotatable charging pipe is retracted to the furnace wall side to avoid collision with the swirl chute at the time when the charge is charged from the furnace top hopper via the swirl chute (1 in FIG. 4). Dash-dot line position). When the charging by the turning chute is completed, the drive motor 9 is moved, the gear 8b is rotated, the rotational force is transmitted to the gear 8b meshed therewith, and the vertical charging pipe 6 is rotated by a predetermined amount.
[0029]
As described above, since the lower end of the vertical charging pipe 6 is meshed with the inclined charging pipe 7, the rotational force is received and transmitted to the inclined charging pipe 7, and the inclined charging pipe 7 is also a predetermined amount. The rotation is stopped and the rotation is stopped when the tip of the inclined charging pipe 7 is swung to the furnace center, and the setting of the charging pipe is completed. After confirming that it has been set in the center of the furnace, the lower shut-off valve 4 of the center charging coke hopper is opened and the coke 27 is charged into the center of the furnace. When the charging is completed, the rotation operation opposite to the previous one is performed, and the inclined charging pipe 7 is immediately turned and retracted to a predetermined position on the furnace wall side. At this time, the support member 14 also transmits its rotational force from the support body 13, so it goes without saying that it cooperates with the inclined charging pipe 7.
[0030]
FIG. 6 (a) shows the turning state of these charging pipes, and corresponds to the state when the coke is charged into the furnace center in FIG. As described above, after the charging operation is completed, the inclined charging tube 7 is also rotated in the A direction along with the rotation of the vertical charging tube 6, and the protruding plate 24 of the inclined charging tube 7 is the support plate 25 of the rotating tube 19. Move up a predetermined range. The movement distance corresponds to an angle α as a turning angle, and is about 90 degrees in a horizontal plane. (See FIG. 4). The rotation in the direction B indicates the direction in which the charging pipe moves from the furnace wall side retracted position toward the furnace center.
[0031]
Further, in the apparatus of the present invention, the fitting portion between the vertical charging pipe 6 and the inclined charging pipe 7 is a vertical charging pipe in the case of an emergency (for example, when rotation cannot be performed for some reason). 6 and the inclined charging pipe 7 can be easily separated, so that the inclined pipe 7 can be dropped into the furnace by its own weight and detached.
[0032]
In this operation, the drive motor 11 is moved, the small bevel gear 22b is rotated, and the bevel gear 22a meshing with the bevel gear 22a is rotated, whereby the rotation tube 19 fixed to the bevel gear 22a is rotated, and the rotation tube is rotated. When the 19 cutouts 26 move to a position just below the protruding plate 24 of the inclined charging pipe 7, the inclined charging pipe 7 is released from the holding state by the protruding plate 24, and the protruding plate 24 is removed from the cutout 26 of the rotating pipe 19. By dropping, the entire inclined charging pipe 7 is detached from the rotary pipe 19 and simultaneously separated from the vertical charging pipe 6.
FIG. 6B shows the movement of the rotating pipe 19 at this time. After the coke charging operation to the furnace center is completed, the inclined charging pipe 7 becomes non-rotatable and cannot move to the retreat position. When it is predicted that the turning of the turning chute 28 will be disturbed, the turning tube 19 may be turned in the direction C corresponding to the angle β (about 45 degrees). At this time, the support member 14 can also be separated from the support fitting 15 portion.
[0033]
Note that this operation is performed only in an emergency, and the drive motor 11 is fixed without rotating in normal times.
In addition, the cutout portion 26 provided on the lower inner surface of the rotating pipe 19 is naturally set to a position where the protruding plate 24 on the upper end surface of the inclined charging pipe 7 does not fall during normal rotation operation of the vertical charging pipe 6. It is necessary.
[0034]
【The invention's effect】
According to the present invention, in a blast furnace charging device, in particular, a bell-less blast furnace, predetermined coke can be thrown into the center area of the furnace without interfering with the drive of the tilting type turning chute. In addition, it is not necessary to lower the charging surface at the top of the blast furnace to the lower part of the furnace, coke can be charged into the central area of the furnace, and an effective charging layer for the charging of the blast furnace operation can be obtained. There is a great deal to contribute.
[Brief description of the drawings]
[Fig. 1] A diagram showing the outline of coke charging into the furnace center in a conventional bell-type blast furnace [Fig. 2] A diagram showing an outline of coke charging into the furnace center in a conventional bell-less blast furnace [Fig. 3 is a side view showing an outline of an example of charging into a blast furnace with the apparatus of the present invention. FIG. 4 is a plan view showing an outline of an example of charging into a blast furnace with the apparatus of the present invention. 6A is a cross-sectional view taken along line AA 'in FIG. 5, and FIG. 6B is a cross-sectional view taken along line B-B' in FIG.
DESCRIPTION OF SYMBOLS 1 Blast furnace top part 2 Charging pipe 3 Furnace top mantel 4 Shut-off valve 5 Charging hopper 6 Vertical charging pipe 7 Inclined charging pipe 8 Gear 9 Drive motor 10 Casing 11 Drive motor 12 Downcomer pipe 13 Bearing 14 Support member 15 Support bracket 16 Spring body 17 Discharge pipe 18 Support body 19 Rotating pipe 20 Receiving shelf 21 Housing 22 Bevel gear 23 Projection part 24 Projection board 25 Support plate 26 Notch part 27 Coke 28 Swivel chute 30 Insertion line

Claims (1)

  In order to sort charge of coke, scrap, granular iron, or reduced iron into the center of the blast furnace, the charge for storing the charge for sorting is stored around the top of the blast furnace. A hopper is provided, and a vertical charging pipe is rotatably inserted into the blast furnace through the top mantel through a discharge pipe attached to the lower part of the hopper, and the lower tip of the vertical charging pipe is inclined. A gear body that is fitted to the vertical portion of the charging pipe and is fixed by surrounding the vertical charging pipe, and a rotation drive mechanism that is rotated by another gear body that meshes with the gear body, are attached to appropriate portions of the furnace top mantel. A sorting and charging device for the center of the blast furnace.

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