JPH09296206A - Furnace top charging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leaned piling of charged raw material by uniformly distributing the raw material in the furnace. SOLUTION: Plural furnace top hoppers 10a, 10b are arranged in the eccentric position from the furnace center line O at the upper part of a raw material collecting hopper 6 having a raw material flowing-out hole 9 on the furnace center line O. The raw material which is discharged from the furnace top hoppers 10a, 10b at the eccentric position and dropped by flowing is the direction of the raw material flowing-out hole 9 through the raw material collecting hopper 6, is deflected with a rocking chute 19 in a raw material guide device 15 so as to drop to the furnace center. The rocking chute 19 is supported so as to be shakable in any direction in the circular direction by free angle. A resistant body 33 is arranged at the upper part of the rocking chute 19. The resistant body 33 is made to vertically move with a hydraulic pressure cylinder 36 through a rod 35 and the velocity component in the horizontal direction of the raw material developed in the raw material collecting hopper 6 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace top charging device for charging raw materials into a vertical furnace, and a bellless type furnace for distributing the charged raw materials into the furnace by a distribution chute. The present invention relates to a top charging device.

[0002]

2. Description of the Related Art A so-called bell-less type furnace top device for uniformly distributing a raw material without using a bell for charging the raw material into the furnace is a top portion of the furnace 1 as shown in FIG. , The support frame 2 is fixedly installed, and the turning table 3'and the vertical chute 3 fixed to the turning table 3'are rotatably supported at a position on the furnace center line O of the support frame 2, and The vertical end of the gutter-shaped distribution chute 4 having a U-shaped cross section is vertically rotated (tilted).
The distribution chute 4 is freely mounted, and the vertical chute 3 is rotated to rotate the distribution chute 4 in the horizontal direction, and the distribution chute 4 is tilted to arbitrarily change the radius of the distribution chute 4. It can be changed. Further, the expansion tube 5 is installed on the support frame 2 so as to be located above the vertical chute 3.
Above the expansion tube 5, a plurality of top plates 7 (3 in the figure) are provided.
(3) A raw material inflow opening 8 is provided, and a raw material collecting hopper 6 having a single raw material outlet 9 is arranged at the lower end so that the raw material outlet 9 communicates with the telescopic tube 5. Further, three furnace top hoppers 1 are provided above the raw material collecting hopper 6.
0a, 10b, 10c are separately fixedly installed at positions eccentric from the furnace center line O, and each furnace top hopper 10a, 1
0b and 10c are a flow rate adjusting gate 11 and a furnace top hopper 10a, 10b, 10 for quantitatively cutting out the raw material to the lower end side.
In order to measure the raw material in c, a bottom end is provided with a telescopic tube 12 for the purpose of cutting edges with the lower and adjacent furnace top hoppers 10a, 10b, 10c. To each furnace top hopper 10a, 1
At the lower end of 0b, 10c, the furnace top hoppers 10a, 10b,
A lower seal valve 13 is provided to shut off the inside of the furnace top hoppers 10a, 10b, 10c from the furnace pressure when the raw material inside 10c is charged into the raw material collecting hopper 6.

Therefore, in the conventional furnace top charging device, when the raw materials in the furnace top hoppers 10a, 10b, 10c are adjusted in flow rate by the flow rate adjusting gate 11 and enter the raw material collecting hopper 6, the raw material collecting hopper 6 is From the raw material outlet 9 at the lower end, it is dropped onto the distribution chute 4 through the expansion tube 5 and the vertical chute 3, and is charged into the furnace from the tip of the distribution chute 4.
At this time, the distribution chute 4 is swung and tilted so that the distribution chute 4 is distributed at a position of an arbitrary radius from the core.

In such a furnace top charging device, if the gas flow is deflected, the refractory in the furnace is partially worn and the operating efficiency is deteriorated. It is necessary to prevent the uneven distribution of the deposited raw materials by uniformly charging the raw materials.

However, as shown in FIG. 7, a plurality of furnace top hoppers 10a, 10b, 10c are arranged eccentrically from the furnace center line O, and the raw materials are fed into one raw material collecting hopper 6. In the case of such a furnace top charging apparatus, the flow of the raw material in the raw material collecting hopper 6 changes for each of the different furnace top hoppers 10a, 10b, 10c, and the arrow a in FIG.
And b, the raw material flow has a horizontal velocity component due to the difference in the horizontal installation positions of the furnace top hoppers 10a, 10b, and 10c. Therefore, the drop velocity at the swirl angle position (horizontal angle) changes due to the difference in the position of each of the plurality of furnace top hoppers, so that the raw material drop velocity (velocity vector) from the distribution chute 4 into the furnace is as described above. The influence of the horizontal velocity and the fall of the raw material from the raw material collecting hopper 6 onto the distribution chute 4 are shifted from the furnace center line O like the flows a and b of the raw material. The raw material collision position changes depending on the turning angle position. Therefore, the distance (L in FIG. 7) over which the raw material slides on the distribution chute 4 changes depending on the turning angle position, and the acceleration amount on the distribution chute 4 and the sliding resistance received from the distribution chute 4 change. , The raw material gliding speed on the distribution chute 4 and the raw material falling speed from the distribution chute 4 change depending on the swiveling position. The raw material is tipped on the distribution chute 4 because the distribution chute 4 is swirling at the time of charging the raw material. During the sliding to the side, the distribution chute 4 may be displaced in the lateral direction and rise up, and the amount of this rise changes depending on the collision position and the sliding speed of the raw material falling onto the distribution chute 4. Therefore, the position where the raw material is ejected from the distribution chute 4 changes at the swivel position, and the raw material deposited in the furnace causes an uneven product, which causes the gas flow in the furnace to be deflected, There is a problem that it becomes difficult to operate stably.

Therefore, the raw material collecting hopper 6 is conventionally used.
For the purpose of reducing the horizontal component of the raw material inside and dropping the raw material to the position of the furnace center line O on the distribution chute 4, the cylindrical centering chute 14 is fixed to the lower end portion of the raw material collecting hopper 6 as shown in FIG. Or a centering device (not shown) is installed at the lower end of the raw material collecting hopper 6 so that the plurality of gate plates are sequentially rotatably mounted so that the raw material collecting hopper 6 can be installed.
It has been proposed that the raw material outlet 9 is opened and closed.

[0007]

However, in the case where the fixed centering chute 14 as shown in FIG. 7 is provided, although the horizontal component of the raw material in the raw material collecting hopper 6 can be canceled a little, it is completely canceled. Therefore, it is impossible to set the dropping position of the raw material dropped from the raw material collecting hopper 6 onto the distribution chute 4 onto the furnace center line O, which causes various problems as described above.

Further, in the case of using the centering device composed of a plurality of gate plates, even opening can be obtained about the center line O of the furnace, but since the gate plates overlap each other and there is an overlapping part, the gate plates are overlapped. Each step has a step, and this step adds resistance to the flow of the raw material, which may cause deflection of the raw material flow. Further, in order to improve the efficiency of the furnace in the future, it is desired that the raw materials are cut out from a plurality of furnace top hoppers 10a, 10b, 10c at the same time, and the raw materials are put into the raw material collecting hopper 6 and charged into the furnace. However, in such a case,
If there is a step in the gate plate, the step causes the raw material from, for example, 10a among the top hoppers 10a, 10b, 10c on one side to easily flow, and the top hopper 1 on the opposite side 1
It is considered that the raw material from 0b is difficult to flow, and the difference in the flow due to the step of the gate causes the mixing ratio of the discharged raw material to change with time, which is not preferable in operation. Further, in the centering device using this gate plate, it is necessary to set the gate opening to an opening corresponding to the flow rate of the raw material, and to determine each gate position for centering. Since it is a control, it is conceivable that control cannot be performed easily.

Further, when the blast furnace is operated for a long period of time, partial wear of the refractory material in the furnace occurs due to deflection of the gas flow due to various causes and the iron shell is heated, resulting in partial wear of the furnace shell. Occurs and the furnace cannot operate. In such a case, the uneven distribution of the raw material is positively controlled to control the gas flow to suppress the gas flow to the parts that are subject to severe wear, and thus the furnace wall made of refractory in the furnace and the iron shell It is necessary to protect the environment, and development of means for that is desired.

In view of the above, the present invention eliminates the problems caused by a centering device having a fixed centering chute or a gate plate provided at the lower end of the above-mentioned raw material collecting hopper and removing the raw material at the position of the center line of the distribution chute. It is intended to protect the furnace wall by allowing the material to be dropped and biasing the deposition status of the raw materials charged in the furnace.

[0011]

In order to solve the above-mentioned problems, the present invention provides a plurality of furnace top hoppers having a flow rate adjusting gate at the lower end and a lower seal valve attached at the lower end from the furnace center line. It is installed at an eccentric position, and the raw material discharged from each of the furnace top hoppers is dropped from the outlet on the furnace center line onto the distribution chute through the vertical chute on the furnace center line to be deposited in the furnace. In the furnace top charging device, a cylindrical fixed chute and a rocking chute are arranged above the vertical chute so as to be located on the furnace center line, and the rocking chute is slid in any direction. The structure is such that it is supported so as to be able to swing so as to move in the form of wood and is connected to a drive device.

The raw material discharged from each furnace top hopper into the raw material collecting hopper is flown to the raw material outlet on the center line of the furnace and dropped to the rocking chute. The rocking chute flows in the raw material collecting hopper. Since the material can be swung according to the direction, the raw material can be dropped along the furnace center line. As a result, the raw material is always dropped to a fixed position on the distribution chute, which enables uniform distribution in the furnace.

If the fixed chute can be removed, the swing chute can be easily pulled out upward for maintenance and inspection, which facilitates the work.

Further, a resistor serving as a resistance of the raw material flowing in the raw material collecting hopper to enter the fixed chute and to the rocking chute is positioned on the furnace center line, and moves vertically on the raw material collecting hopper via a rod. By supporting the raw material freely and inserting it into the fixed chute, the horizontal velocity component of the raw material in the raw material collecting hopper can be reduced.

Further, by making the resistor rotatable so that the resistor has a flat weight shape, the horizontal velocity component of the raw material can be reduced and the raw material can be dropped along the furnace center line.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention. As shown in FIG. 7, there is a support frame 2 on the top of a furnace 1, and a vertical chute 3 and a distribution chute 4 are supported. A raw material collecting hopper 6 is provided above the raw material collecting hopper 6, and a raw material outlet 9 at the lower end of the raw material collecting hopper 6 is communicated with the vertical chute 3 via a telescopic tube 5. Further, above the raw material collecting hopper 6, Three furnace top hoppers 10a, 10b, 10c are installed at positions eccentric from the furnace center line O,
The lower end of each furnace top hopper 10a, 10b, 10c is fitted into the raw material collecting hopper 6, and each furnace top hopper 10
a, 10b, 10c are provided with a flow rate adjusting gate 11 for quantitatively cutting out a raw material and a lower seal valve 13, and a plurality of furnace top hoppers 10a, 10b at eccentric positions are provided.
The raw material charged into the raw material collecting hopper 6 from 10c is
In a configuration in which the raw material outlet 9 located at the position of the furnace center line O is allowed to drop onto the distribution chute 4 via the vertical chute 3, a centering chute is provided between the raw material collecting hopper 6 and the vertical chute 3. Instead of 14, a raw material guide device 15 which is a feature of the present invention is installed. Other configurations are the same as those shown in FIG. 7, and the same components are designated by the same reference numerals.

As shown in FIGS. 2 and 3, the raw material guide device 15 has an opening in the vertical direction, the upper end is detachably fixed to the lower end of the raw material collecting hopper 6, and the lower end is a supporting frame. The casing 16 which is detachably fixed to the upper part of the expansion tube 5 above 2, and the protective plate 18 for preventing abrasion due to the raw material are attached to the inner surface so that the inner side has a polygonal shape and the center is the center of the furnace. A fixed chute 17 which is detachably attached to the inside of the upper part of the casing 16 so as to come on the line O, and a lower position of the fixed chute 17, the upper end of which is expanded like a trumpet and the inner surface is prevented from being worn by the raw material. And a swing chute 19 attached so that the inner side has a polygonal shape. The swing chute 19 is rotatable at its outer ends by a horizontal shaft 21. Is supported by the casing 16 via a support arm 22 which Attach, and the swinging chute 19 is a rotary motion about a horizontal axis 21 and the rotation direction are then so that rotational movement of the perpendicular direction is carried out. That is, the shaft support hardware 2 attached to one side of the casing 16
3, the base ends of the two support arms 22 are connected to the distal end of a hollow shaft 26 that is rotatably and airtightly supported via a bearing 24 and a gas seal device 25. A drive device in which the swing chute 19 is supported by the casing 16 via the support arm 22, a bracket 27 is fixed to the side surface of the swing chute 19 on the hollow shaft 26 side, and the bracket 27 is inserted into the hollow shaft 26 and attached. Hydraulic pressure,
The tip of the rod 29 of the fluid pressure cylinder 28 such as pneumatic pressure is connected to the bracket 27 via the link 30, and further, the bracket 31 attached to the hollow shaft 26 is connected to the fluid pressure cylinder 32 as a driving device. By operating the fluid pressure cylinder 28, the swing chute 19 is rotated through the link 30 in the left-right direction around the horizontal shaft 21, and by operating the fluid pressure cylinder 32, the hollow shaft 26 is rotated. The swinging chute 19 together with the support arm 22 is rotated in the front-back direction in the figure to allow the ground powder movement.

The protective plate 2 is provided on the inner surface of the swing chute 19.
Although 0 is provided in a polygonal shape, it may be a polygonal shape other than that shown. Further, the inner diameter of the rocking chute 19 is determined from the raw material flow rate required for the operation.

Further, in order to enhance the effect of controlling the flow direction of the raw material in the raw material collecting hopper 6, the raw material generated in the raw material collecting hopper 6 at a position near the raw material outlet 9 at the lower end of the raw material collecting hopper 6. A resistor 33 for reducing the horizontal velocity component is provided at a position on the furnace center line O so that it can be freely moved up and down.

The resistor 33 is formed in a downwardly conical cone shape, and a circular plate 34 is attached to the upper surface so that the peripheral portion of the resistor 33 projects. When it is necessary to fully close the valve for maintenance and inspection, the resistor 33 is lowered and the circular plate 34
The fixed chute 17 can be used to close the lid. The resistor 33 penetrates the upper end of the raw material collecting hopper 6 and is fixed to and supported by the lower end of a rod 35 arranged on the furnace center line O. The rod 35 serves as a drive device for moving up and down. The upper end is connected to a fluid pressure cylinder 36 such as hydraulic pressure or pneumatic pressure, and the resistor 33 can be moved in the vertical direction via the rod 35 by the fluid pressure cylinder 36. Reference numeral 37 is a gas seal device in a portion where the rod 35 penetrates the upper end surface of the raw material collecting hopper 6, and 38 is a bearing of the rod 35.

Three furnace top hoppers 10a, 10b, 10
When the raw materials are sequentially charged into the raw material collecting hopper 6 from one of the c, each of the furnace top hoppers 10a, 10b, 10c
The angle of the swing chute 19 of the raw material guiding device 15 is set according to the position of. In this case, as shown in FIG. 4, the furnace top hopper 1 located at a position eccentric from the furnace center line O
0a, 10b, 10c, for example, when feeding the raw material discharged from 10a into the raw material collecting hopper 6,
The lower end of the swing chute 19 is tilted so as to move toward the furnace top hopper 10a, and when the raw materials discharged from the furnace top hoppers 10b and 10c are fed into the raw material collecting hopper 6, they are also tilted. Furnace top hopper 1
Furnace top hoppers 10a, 10 for feeding the raw materials by tilting the swing chute 19 toward 0b or 10c.
The falling direction is guided by the swing chute 19 whose angle is set according to the positions b and 10c, the position of the raw material dropping onto the distribution chute 4 is controlled, and the raw material is dropped from the furnace center line O position. The rocking chute 19 can be rocked in any direction by a combination of rocking of the fluid pressure cylinder 28 as a drive device about the horizontal shaft 21 and rocking of the fluid pressure cylinder 32 about the hollow shaft 26. Can be performed at any angle.

The swing chute 19 is provided on the inner surface with the protective plate 2
No. 0 is attached to prevent abrasion due to raw materials. However, when maintenance inspection is required, the fixed chute 17 located above is removed, and then the support arm 22
By removing the link 30 and the link 30, it is pulled out upward.

Further, the rocking chute 19 is set on the distribution chute 4 by arbitrarily setting the angle with respect to the furnace center line O in correspondence with the positions of the furnace top hoppers 10a, 10b, 10c for discharging the raw materials. In addition to controlling the raw material dropping position, the resistor 33 can be moved up and down to reduce the horizontal velocity component of the raw material discharged from the furnace top hoppers 10a, 10b, 10c at the eccentric position. That is, by displacing the resistor 33 in the up-down direction via the rod 35 by the fluid pressure cylinder 36 as a driving device, the raw material flow A shown in FIG. 1 according to the flow rate set by the upstream flow rate adjusting gate 11. The flow velocity B of the raw material to the side and the opposite side to reduce the horizontal velocity component of the raw material, and to swing due to the difference in the positions of the furnace top hoppers 10a, 10b, 10c. Prevents the deflection of the raw material flow in the chute 19,
The flow direction can be effectively controlled.

Next, FIGS. 5 and 6A and 6B show another embodiment of the present invention in which the resistor 33 can be rotated as well as vertically moved. That is, on the top plate 7 at the upper end of the raw material collecting hopper 6, the frame 39 is installed along the rod 35 protruding upward from the top plate 7, while the rod 35 protruding above the top plate 7 is installed. The spline 40 is processed on a part of the surface of the rod and the rod 3
5 is cut to allow the lower end side of the rod 35 to freely rotate by interposing a rotary joint 41, and the frame 39 is engaged with the spline 40 of the rod 35 to vertically move. A rack 4 that rotatably supports a ring gear 42 that is free and is integrated only in the rotation direction through a rotary joint 43, and that is meshed with the ring gear 42.
4 is connected to a fluid pressure cylinder 45 such as hydraulic pressure or pneumatic pressure as a drive device, and the fluid pressure cylinder 45 is connected to the frame 3
9, and the rack 4 is supported by the fluid pressure cylinder 45.
4. Rotate the rod 35 through the ring gear 42 to rotate the resistor 33.

Further, the resistor 33 is not only moved up and down, but also rotated.
6A and 6B, instead of a conical one, a flat weight-like one is formed, and each furnace top hopper 10 is rotated by rotation.
The raw material flows from a, 10b, and 10c can be faced in the same manner, and the resistance to the raw material flow is adjusted by the vertical movement of the resistor 33.

When the resistor 33 is rotated in the shape of a flat weight in this way, the furnace top hoppers 10a, 10b, 10 at different positions eccentric from the furnace center line O are formed.
The horizontal velocity component of the feedstock from c can be reduced more effectively and the feedstock flow can be altered.

In the present invention, since the raw material guiding device 15 for changing the falling direction of the raw material is provided above the vertical chute 3 for dropping the raw material on the distribution chute 4, the shaking of the raw material guiding device 15 is constituted. By controlling the swing direction of the dynamic chute 19, the falling direction of the raw material can be arbitrarily changed. Therefore, when the furnace refractory partially wears due to long-term operation of the furnace. Moreover, it becomes possible to actively protect the wear point. That is, by changing the falling position of the raw material dropped onto the distribution chute 4 via the vertical chute 3 by the swing chute 19, it is possible to positively generate a partial product of the raw material deposited in the furnace. Therefore, the gas flow can be changed to suppress the gas flow to the worn parts of the in-furnace refractory, and the worn parts can be protected.

Although the fixed chute 17 is detachably attached in consideration of the maintenance and inspection of the rocking chute 19, the fixed chute 17 is replaced when the rocking chute 19 may take time. May be fixed to the raw material collecting hopper 6.

[0030]

As described above, according to the furnace top charging apparatus of the present invention, the raw material discharged into the raw material collecting hopper from the furnace top hopper located at the position deviated from the furnace center line is fed to the lower end of the raw material collecting hopper. In the configuration in which the vertical chute is dropped onto the distribution chute to be deposited in the furnace, the swing chute is moved forward and backward at a position above the vertical chute.
Since the raw material guide device is installed so that it can be freely swung to the left and right, the raw material flowing in the raw material collecting hopper is swung by the swing chute in accordance with the direction of the raw material flow. It can be dropped to the center position, it is possible to prevent the uneven accumulation of the raw material deposited in the furnace, by which the gas flow in the furnace can be made uniform in the circumferential direction in the horizontal cross section of the furnace, The excellent effect of preventing partial wear of the refractory in the furnace and improving the operation efficiency can be obtained. Also, by attaching the fixed chute detachably, the swing chute can be easily moved upward. It can be pulled out for maintenance and inspection work, and the swing position of the raw material can be arbitrarily changed by swinging the swing chute as described above. It is also possible to positively generate raw material unevenness, and when partial wear of the refractory in the furnace occurs at the end of the furnace life, positively cause such raw material unevenness to occur, and There is also an effect that it is possible to suppress the gas flow to a certain place and to protect the wear point. Furthermore, by installing a resistor above the swing chute so that it can move up and down, it is discharged from the furnace top hopper at a position eccentric from the furnace center line into the raw material collecting hopper and flows toward the furnace center line. By reducing the horizontal component due to the raw material entering the fixed chute, it is possible to prevent the deflection of the raw material flow in the rocking chute, and also by allowing the resistor to rotate and by making the resistor into a cone shape, The excellent effect that the horizontal velocity distribution due to the raw material flowing in the raw material collecting hopper can be more effectively reduced and the flow of the raw material can be controlled can be obtained.

[Brief description of drawings]

1 is a cut-away side view of a furnace top charging device of the present invention.

FIG. 2 is an enlarged cutaway side view of a raw material guide device in the furnace top charging device of the present invention.

FIG. 3 is a sectional plan view of FIG.

FIG. 4 is a schematic plan view showing the furnace top charging device of the present invention in an easy-to-understand manner.

FIG. 5 is an enlarged side view showing a mechanism for rotating a resistor in the furnace top charging device of the present invention.

FIG. 6 is a view showing a shape when a resistor is rotated,
(A) is a plan view and (B) is a side view.

FIG. 7 is a cut side view showing an example of a conventional furnace top charging device.

[Explanation of reference symbols] 1 furnace 3 vertical chute 4 distribution chute 6 raw material collecting hopper 7 top plate 9 raw material outlets 10a, 10b, 10c furnace top hopper 11 flow rate adjusting gate 13 lower seal valve 15 raw material guiding device 16 casing 17 fixed chute 19 Swing chute 21 Horizontal shaft 22 Support arm 26 Hollow shaft 28 Fluid pressure cylinder (driving device) 32 Fluid pressure cylinder (driving device) 33 Resistor 35 Rod 36 Fluid pressure cylinder (driving device) 40 Spline 42 Ring gear 44 Rack 45 Fluid Pressure cylinder (drive device)

Claims (4)

[Claims] 1. A plurality of furnace top hoppers having a flow rate adjusting gate at the lower end and a lower seal valve attached at the lower end are installed at positions eccentric from the furnace center line, and discharged from each of the furnace top hoppers. In the furnace top charging device, the raw material thus prepared is dropped from the outlet on the furnace center line through the vertical chute on the furnace center line onto the distribution chute to be deposited in the furnace, at a position above the vertical chute. , A cylindrical fixed chute and a rocking chute are arranged so as to be located on the furnace center line, and the rocking chute is supported so as to rock in a desired direction so that the driving device can move. A furnace top charging device characterized by being connected. 2. The furnace top charging device according to claim 1, wherein a fixed chute above the swing chute is detachably attached to the raw material collecting hopper. 3. A resistor, which acts as a resistance of the raw material flowing in the raw material collecting hopper, enters the fixed chute, and flows to the swing chute, is positioned on the furnace center line, and moves vertically on the raw material collecting hopper via a rod. The furnace top charging apparatus according to claim 1 or 2, wherein the apparatus is supported freely and is inserted into a fixed chute. 4. The resistor is formed as a weight on the center line of the furnace, is supported on the raw material collecting hopper via a rod so as to be movable in the vertical direction, and is inserted into a fixed chute. The furnace top charging device according to 1 or 2.