JPH07179916A - Bell-less type furnace top charging device for vertical furnace - Google Patents

Abstract

PURPOSE:To always hold a chute for straightening raw material flow arranged at the tip end part of a swing chute to vertically downward, at the time of charging the raw material into a furnace from the swing chute. CONSTITUTION:The swing chute 5 is supported to a vertical chute 4 through a connecting pin 11 so as to be freely tilted by driving, and also, the chute 7 for straightening the raw material flow is supported to the tip end part of the swing chute 5 through a connecting pin 12. A link rod 10 is arranged along the upper part of the swing chute 5 and the one end part of the link rod 10 is connected to the vertical chute 4 through a connecting pin 13 and, the other end part thereof is connected the chute 7 for straightening the raw material flow through a connecting pin 14. Link mechanism for working having parallelogram is formed with the link rod 10 and the chute for straightening the raw material flow is always held in the vertical direction with the link rod 10 by utilizing the incline-driving force of the swing chute 5. By this method, the distribution of the raw material is optimized in the radial direction of the furnace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to optimize the material distribution in the radial direction of a furnace, which is placed at the top of a blast furnace or the like and is charged into the furnace through a swirling chute with a variable swirling radius. The present invention relates to a bellless type furnace top charging device for a tight-fitting furnace.

[0002]

2. Description of the Related Art In the operation of a blast furnace as one of the solid furnaces, the distribution of raw material charges (coke, ore, etc.) in the radial direction of the furnace top, that is, the particle size distribution and bed thickness distribution (L _O /
L _C : L _O is the ore layer thickness and L _C is the coke layer thickness), and the gas flow distribution and heat flow ratio distribution (the ratio of the solid heat capacity flow rate to the gas heat capacity flow rate) are further controlled. It is important to make the state of reduction and dissolution of ores that occur as a result uniform in the circumferential direction and to have an optimum distribution in the radial direction. For that purpose, it is necessary to flexibly and accurately control the distribution of the charge at the top of the furnace in response to the constantly changing operation state of the blast furnace.

A bell-type charging device has been conventionally known as a means for controlling the distribution of the charging material at the top of the furnace, and the distribution of the charging material such as coke or ore is stock line I.
It was optimized by taking into consideration the dropping motion of the charged particle group, the reflection on the armor, and the rolling behavior on the charging surface depending on the charging amount of the batch, the charging sequence, the position of the movable armor, and the like.

Further, as a distribution control means for increasing the degree of freedom of distribution control of the raw material charge, there is a bellless type swivel chute, and various kinds of distribution control can be performed by changing the number of swiveling chutes and the angle of the swiveling chute. Had been realized.
However, in any of the above charging means, the charged particle groups are on the slip surface of the charging device (the slip surface of the bell cup in the case of the bell type, the slip surface of the swivel chute in the case of the bellless charging device). It slid down along the surface, freely fell from the tip of the slip surface, and after rolling motion on the pile, the layer thickness and particle size distribution were regulated.

However, such a charge distribution control method has the following problems: (1) Since the free fall distance is long, there is a risk of pulverization when falling. (2) Since the free fall direction is the extension direction of the slip surface,
Due to the strong centrifugal inertia force at the time of dropping, break the loading surface in front,
Change the layer thickness distribution. (3) Further, in the case of (2), the particle groups of the charged particles may be classified in the radial direction depending on the particle size distribution of the charged material forming the old deposit surface. (4) Further, when the charging amount of the I batch is changed or the height of the old deposit surface (stock line) is changed, the distribution of the charged substance is extremely changed and the stability against disturbance is poor. (5) The material falling position cannot be accurately estimated. There were problems such as.

As a charging device for solving such a problem, Japanese Patent Laid-Open Publication No. 49-23111 discloses a revolving rotation device equipped with a position changing mechanism at the tip and a vertical chute for raw material straightening at the tip of the chute. Was disclosed. FIG. 6 is a schematic view of the raw material charging device disclosed in the patent publication, in which a vertical chute 4 is attached to a chute rotation device 11. A support member 19 attached to the vertical chute 4 supports a parent chute 5a via a pin 20, and a child chute 5b that slides on the parent chute 5a.
Install. The raw material rectifying chute 7a is supported at the tip of the child chute 5b via a pin 21 to form a swiveling chute.

The child chute 5b is capable of moving forward and backward along the parent chute 5a. After the raw material falling from the vertical chute 4 is received by the parent chute 5a, the raw material rectification is performed while falling off the child chute 5b. It is loaded into the blast furnace 8 through the chute 7a. At this time, the position of the raw material charged in the furnace in the radial direction of the furnace is adjusted by sliding the child chute 5b back and forth along the parent chute 5a.

However, Japanese Patent Application Laid-Open No. 49-2311 shown in FIG.
With the furnace top charging device disclosed in Publication No. 1, the above problems are alleviated, and (1) uniform drop position in the circumferential direction (2) raw material charging with a narrow drop width (3) vertical Although the drop position was made uniform regardless of the height of the raw material surface before the raw material was charged by dropping, (1) the position change mechanism of the child chute arranged at the tip of the swivel rotation device had a complicated structure. Is required, and maintenance management becomes complicated for an apparatus placed in a high temperature and dusty environment. (2) The raw material flow straightening chute is vertical in order that the particles newly charged on the old deposit surface of the V-shaped or M-shaped furnace interior charge can be distributed with high accuracy in the entire radial direction of the furnace. It is preferable that the sheet is inclined at a proper angle from below. (3) Since the turning chute itself cannot be set up in the vertical direction, it is impossible to carry out special charging such that the charging material is distributed only in the central portion of the furnace. (4) Changes in the positional relationship between the direction of the swirling chute and the hopper position that occur when the chute rotates, and variation in the charging speed of the charging material that occurs due to variations in the sliding speed of the charging particle group on the rotating chute. It is not possible to prevent time variations (variations). (5) Since the velocity component in the furnace radial direction is not sufficiently erased, there is room for improvement in the accuracy of depositing at the target drop position. There were problems such as.

[0009]

The present invention solves the above problems, that is, (1) the charging device itself has a structure as simple as possible, and (2) a V-shaped or M-shaped structure. It is possible to incline the raw material straightening chute at an appropriate angle with respect to the old stack surface of the V-shaped furnace interior container, and (3) without turning the vertical chute itself vertically, It is possible to carry out special charging such that the charging is distributed only in the central part, and (4) changes in the positional relationship between the direction of the turning chute and the hopper position that occur when the chute rotates, and charging particles. It is possible to prevent the time variation (variation) of the charging rate of the charging material caused by the variation of the sliding velocity on the swiveling chute of the group, (5) More accurate and more accurate deposition at the target drop position, Bellless type furnace top loading It is an object to provide a.

[0010]

In order to achieve the above object, the present invention as set forth in claim 1, is a vertical chute for guiding the discharged raw material by using a flow rate adjusting gate provided at the lower part of the furnace top hopper, and a vertical chute. A swivel chute whose one end is tiltably supported by driving through a first connecting pin provided on the lower part of the vertical chute, and a raw material supported via a second connecting pin provided on the other end of this swiveling chute. A bellless type furnace top charging device for a rigid furnace, comprising:
A link rod is arranged along the upper side of the straight line connecting the connecting pin and the second connecting pin, and one end of the link rod is connected to the vertical chute via the third connecting pin, while the other end is connected to the fourth chute. A link mechanism for operation is formed by connecting to the raw material straightening chute via a pin, and the tilting driving force of the turning chute is transmitted to the raw material straightening chute via a link rod of the working link mechanism, thereby A bellless furnace top charging device for a tight-fitting furnace, characterized in that the material straightening chute is configured to always maintain a constant angle regardless of the tilting angle.

According to a second aspect of the present invention, an operating link mechanism is formed by disposing a link rod by intersecting the first connecting pin and the second connecting pin instead of along a straight line connecting the first connecting pin and the second connecting pin. The tilting driving force of the swirling chute is transmitted to the raw material straightening chute via the link rod of the raw material, and the tilt angle of the raw material straightening chute is closer to the furnace center with respect to the vertical downward line when the raw material is centrally charged, and around the raw material. The bellless furnace top charging device for a tight-fitting furnace according to claim 1, wherein the bellless type furnace top charging device is configured to tilt toward a furnace wall side with respect to a vertically downward line when charging.

According to the third aspect of the present invention, the fixed position of the third connecting pin on the vertical chute side of the link rod connected to the raw material straightening chute is made movable so that the raw material straightening material can be used during the furnace operation. 3. A structure in which the tilt angle of the chute can be changed.
It is the bellless type furnace top charging device for the described rigid furnace. According to a fourth aspect of the present invention, the raw material straightening chute is a small hopper type chute, and the hopper type chute is supported by a connecting pin at the tip of the turning chute without a link rod. The bellless furnace top charging device for a rigid furnace according to claim 1.

[0013]

FIG. 1 is a schematic view of a bellless type furnace top charging device according to claim 1 of the present invention, which uses flow rate adjusting gates 2 provided under the two furnace top hoppers 1, respectively. A vertical chute 4 having a collecting chute 3 for guiding the discharged raw material 6, and a swivel chute 5 having one end supported by a lower part of the vertical chute 4 via a first connecting pin 11 so as to be tiltable by driving. Second provided on the other end of the turning chute 5
It is similar to the conventional structure in that the raw material rectifying chute 7 supported through the connecting pin 12 is provided.

In the present invention, the link rod 10 having a constant length is arranged along the upper side of the straight line A connecting the first connecting pin 11 and the second connecting pin, and one end of the link rod 10 is connected to the third side. While connecting to the vertical chute 4 via the connecting pin 13,
The other end is connected to the raw material rectifying chute 7 through the fourth connecting pin 14.
To form an operating link mechanism. Then, a tilting drive device (not shown) for tilting the turning chute 5 via an operating link mechanism formed by using the link rod 10.
Driving force is transmitted to the raw material rectifying chute 7 by the link rod 10, whereby the tilt angle θ of the turning chute 5 is increased.
The material rectifying chute 7 is always held at a constant angle regardless of the temperature.

In this case, in the present invention, the link rod
The first of the movable parts by the link mechanical mechanism using 10
By forming a parallelogram having four points of the connecting pin 11, the second connecting pin 12, the third connecting pin 13, and the fourth connecting pin 14 as vertices, the discharge direction of the charge of the raw material rectifying chute 7 is always constant. , The vertical direction in FIG. 1.

That is, FIG. 2 shows a procedure for charging the raw material 6 while changing the inclination angle θ of the turning chute 5, and the inclination angle θ is made smaller so that the turning chute 5 is moved as shown in FIG. When charging the raw material 6 in the inverted state in the vicinity of the center of the furnace of the furnace interior container 15, and by slightly increasing the inclination angle θ as shown in FIG. In the case of charging in the middle portion of the direction, as shown in FIG. 2 (c), when the inclination angle θ is increased and it is charged in the vicinity of the furnace wall of the furnace interior container 15, each is fixed by the vertical chute 4. The second connecting point 12 and the fourth connecting point 14 which move from the first connecting point 11 and the third connecting point 13 as starting points are shown in (a) ′, (b) ′ and (c) ′ of FIG. While moving while drawing a parallelogram as shown, the raw material rectifying chute 7 always maintains the vertical state.

In the turning chute 5 which horizontally rotates in the direction of the arrow, the raw material 6 flowing along the inclined surface thereof is a vertical raw material rectifying chute 7 in the case shown in FIG. 2 (a).
It is charged on the furnace interior container 15 near the center of the furnace with almost no collision with the inner wall of the furnace. On the other hand, in the case shown in (b) and (c) of FIG. 2, the raw material 6 flowing along the inclined surface of the turning chute 5 once collides with the inner wall of the raw material rectifying chute 7 and is repulsed. Then, it will be loaded on the furnace interior container 15.

Therefore, in this case, by setting the raw material rectifying chute 6 in the vertical state, the V
The raw material rectifying chute 7 can be tilted at an appropriate angle (vertical in FIG. 2) with respect to the old pile-shaped or M-shaped surface, and the condition depends on the operating conditions of the rigid furnace. Although different, usually, as shown in FIG. 2, the raw material 6 repelled by the raw material rectifying chute 7 can be tilted so as to approach a direction perpendicular to the inclined surface of the old product surface of the furnace interior charge 15. It is effective in reducing the rolling of the new charge particle group on the old deposit surface and realizing a highly accurate charge distribution.

If necessary, the length of the link rod 10, that is, the distance between the connecting pin 13 and the connecting pin 14 is determined by the connecting pin.
By making the distance between the connecting pin 12 and the connecting pin 12 longer, the raw material rectifying chute 7 can always be inclined toward the furnace center side, and conversely, by shortening it, the raw material rectifying chute 7 can always be placed on the furnace wall side. The raw material can be charged into the furnace in a tilted state.

FIG. 3 shows a procedure for charging the raw material 6 while changing the inclination angle θ of the turning chute 5 according to the present invention as set forth in claim 2. In FIG. 3, the link rod 10 is arranged so as to intersect with the straight line A connecting the first connecting pin 11 and the second connecting pin 12, and one end of the link rod 10 is placed above the first connecting pin 11. While being connected to the vertical chute 4 via the third connecting pin 13 located at, the other end is connected to the raw material rectifying chute 7 via the fourth connecting pin 14 located below the second connecting pin 12. Form an actuation link mechanism.

The driving force of a tilting drive device (not shown) for tilting the turning chute 5 is transmitted to the raw material rectifying chute 7 by the link rod 10 through an actuating link mechanism formed using the link rod 10. Thereby, the inclination angle θ ₁ of the raw material straightening chute 7 is changed. That is, as shown in FIG. 3A, when the raw material 6 flowing on the inclined surface of the swirling chute 5 is charged in the vicinity of the central portion of the furnace inner container 15, the inclination angle θ of the swirling chute 5 is reduced. Therefore, the second connecting point 12 and the fourth connecting point 14 which move from the first connecting point 11 and the third connecting point 13 fixed by the vertical chute 4 as the starting points are as shown in FIG. 3 (a) '. In addition, the intersection point C of the link rod 10 with respect to the straight line A connecting the first connecting pin 11 and the second connecting pin 12 is located at the upper portion as shown in FIG. The chute 7 is tilted toward the center with respect to the vertical direction by the link rod 10.

In addition, when charging the furnace inner container 15 in the middle portion in the radial direction of the furnace, the tilt angle θ of the raw material rectifying chute 7 is increased by the link rod 10 by gradually increasing the tilt angle θ of the orbiting chute 5. ₁ becomes smaller, the raw material rectifying chute 10 becomes vertical (θ ₁ = 0) as shown in FIG. 3 (b), and the raw material 6 is charged into the middle portion in the radial direction of the furnace. When the turning chute 5 is further tilted so as to increase the tilt angle θ, the raw material flow rectifying chute 7 is tilted by the link rod 10 toward the furnace wall of the blast furnace 8 on the opposite side, and as shown in FIG. At θ ₂ , the raw material 6 is charged into the periphery.

In this case, the intersection C between the straight line A and the link rod 10 gradually moves downward as shown in FIGS. 3 (a) ', (b)', and (c) ', and the raw material straightening chute 7 is moved.
It is possible to incline the discharge direction of the charge toward the center with respect to the vertical downward line in the case of central charging and toward the furnace wall with respect to the vertical downward line in the case of peripheral charging. . Therefore, in this case, it is possible to perform special charging such that the charge is distributed only in the central portion of the solid-type furnace without vertically standing the turn chute itself. Even if it is shorter than the radius of the furnace at the top of the furnace, it is possible to deposit the charge even around the furnace wall.

FIG. 4 is a schematic view showing an embodiment corresponding to the present invention as defined in claim 3, which is a link rod having a constant length.
A connecting pin 13 provided at one end of 10 is a mechanism that can move vertically along the vertical chute 4. Although the vertical movement mechanism is not specified, for example, a guide (not shown) is provided in the vertical direction on the side surface of the vertical chute 4, and a lifting block 16 fitted to this guide is arranged. And a connecting pin that connects the link rod 10 to the lifting block 16.
13 is provided and the elevating block 16 is moved up and down by an elevating device 17 hanging from above.

As shown in FIG. 4A, an elevating device 17 is used to mount an elevating block 16 having a connecting pin 13 to a vertical chute 4.
When positioned at the lower end of the raw material, the raw material rectifying chute 7 is tilted toward the center of the furnace with respect to the vertically downward direction via the link rod 10. Further, when the elevating block 16 is positioned at an intermediate portion in the height direction of the vertical chute 4, the raw material rectifying chute 7 is tilted to a substantially vertical state via the link rod 10. Further, when the elevating block 16 is positioned at the upper end of the vertical chute 4, the raw material rectifying chute 7 is tilted toward the furnace wall side with respect to the vertically downward direction via the link rod 10.

When such an elevating block 16 moves from the lower end of the vertical chute 4 to the intermediate part and further to the upper end thereof, as shown in FIGS. 4 (a) 'and (b)', the first connecting point 11 is formed.
From the state where the link rod 10 intersects with the straight line A connecting the second connecting point 12 to the state where the link rod 10 extends along the straight line A as shown in FIG. That is, the parallel type shown in FIG. 2 and the cross type shown in FIG. 3 can be combined. This makes it possible to freely change the discharge direction of the raw material rectifying chute during the furnace operation.

Therefore, in this case, as compared with the present invention shown in FIG. 2, the charge should be distributed only in the central portion of the solid type furnace without raising the turning chute itself in the vertical direction. Special charging can be performed, and even if the length of the swirling chute is extremely shorter than the radius of the furnace top, it is possible to deposit the charged material even around the furnace wall. Further, FIG. 5 is a schematic view of a bellless type furnace top charging device corresponding to the present invention according to claim 4.

Generally, in the bellless type swirling chute charging device for a blast furnace as related to the present invention, as shown in FIG. 5, raw materials charged into the furnace are temporarily stored in the furnace top hopper 1 by a belt conveyor. To be done. After the raw material is completely received, the furnace top hopper 1 is cut off from the outside air and adjusted to the same pressure as in the furnace. After that, the flow rate adjusting gate 2 is opened, and the raw material 6 is discharged from the hopper 1 by gravity. The raw material 6 slides down on the collecting chute 3 and falls inside the vertical chute 4.
At this time, the raw material 6 does not flow in the center of the vertical chute 4, but as shown in the figure, drifts to the portion of the vertical chute 4 located in the direction opposite to the discharged hopper 1.

The raw material dropped from the vertical chute 4 slides down on the turning chute 5. That is, since the raw material is unevenly distributed in the vertical chute 1, the flow velocity of the raw material at the tip of the swirling chute 5 varies depending on the circumferential direction of the swirling chute 5, and the speed difference due to the particle size is also promoted. Therefore, the charging rate of the charged material changes (varies) considerably during the turning process. Further, variation in the slip velocity of the raw material particle group on the orbiting chute 5 also causes a temporal change (variation) in the charging rate of the charged material.

Therefore, in the present invention as set forth in claim 4, as shown in FIG. 5, a small hopper type chute 18 is supported on the tip of the turning chute 5 through a connecting pin 12a. As a result, the charging amount of the raw material caused by the change in the positional relationship between the direction of the turning chute 5 and the position of the hopper 1 caused when the turning chute 5 rotates, and the variation in the sliding speed of the charging particle group on the turning chute 5 The raw material 6 discharged from the turning chute 5 with a time change (variation) in speed is temporarily stored in the small hopper type chute 18,
The raw material is to be deposited on the old deposit surface of the furnace top interior charge 15 at a constant discharge rate defined by the hopper 18.

In general, the outflow rate W of the raw material particles from the conical hopper 1 is described in, for example, “Storage and Supply of Powder Fluid” edited by Kagaku Kogyo Co., Ltd.
4, when d _p / D ₀ <0.1, W = 0.18√g (μ _i tan θ) ^−0.38 γd _p ^3.6 (d _p / D ₀ ) ^−2.7 where μ _i : Internal friction coefficient (approximated by tan of repose angle) θ: 1/2 of cone apex angle, γ: apparent specific weight, d _p : particle diameter, D ₀ : outlet diameter, and the charging rate of the charging material. Is a constant speed.

That is, the raw material 6 is once stored in the small hopper type chute 18 and then freely falls from its discharge port. At the discharge port, the raw materials are pressed against each other to form an arch structure, where the upper pressure is supported, so that the raw material flow rate is constant regardless of the inflow rate from the swirling chute and the storage amount in the hopper type chute 18. Further, since the arch structure is once formed, the velocity of each particle becomes zero there. As a result, the raw material drop width is reduced and the controllability of the drop position is improved as compared with the conventional example.

[0033]

【Example】

(Example 1) An improvement effect in a blast furnace having a bellless type furnace top charging device with an inner volume of 4500 Nm ³ is shown. Turning chute length 4
A raw material straightening chute having a length of about 1.5 m and an inner diameter of 0.5 m was attached to the tip of m together with a driving link rod as shown in FIGS. In that case, the material straightening chute was installed vertically downward and facing 10 ° from the vertical downward to the furnace wall side regardless of the tilting of the swirling chute.

As an effect of this, FIG. 7 shows deviations of the hot metal Si concentration according to the conventional example and the present invention, deviations of eight skin flow thermometers indicating the uniformity in the circumferential direction of the upper part of the blast furnace, deviations of the hot metal temperature, and the hot metal temperature. , Changes in Si concentration in hot metal, ΔP / V, and wind reduction frequency were shown. By making the circumferential balance of the contents of the furnace interior uniform, the deviation of the Si concentration in the hot metal, the deviation of the skin flow thermometer, and the deviation of the hot metal temperature can all be reduced, and the hot metal temperature can be lowered. It was possible to reduce the Si concentration in the inside. As a result, the smelting cost in the lower process can be significantly reduced, and a great advantage is obtained.

Further, since the raw material having poor air permeability was prevented from flowing into the central portion of the furnace due to the improvement of the raw material falling position control accuracy and the reduction of the kinetic energy during the raw material accumulation, ΔP / V was lowered and the furnace condition was stabilized. However, the frequency of wind reduction was reduced, and the hot metal manufacturing cost could be reduced. (Embodiment 2) Next, as shown in FIG. 3, when the tilt angle of the swirling chute is small, the raw material rectifying chute is on the furnace center side, and when the swiveling chute is large, the raw material rectifying chute is the furnace wall side. The operation was performed by changing the link length and the connection position of the raw material straightening chute so that

FIG. 8 shows the deposit shape of the charge when the coke is intensively charged in the central portion. Conventionally, as shown in FIG. 8 (a), the falling position of the coke has been deviated from the center, but as shown in FIG. 8 (b), according to the present invention, the coke is deposited on the central portion. FIG. 9 shows the shape of deposits before and after charging the fine-grained ore into the furnace wall. By facing the raw material rectifying chute toward the furnace wall side, in the present invention shown in (b), the fine-grained ore can be surely placed on the flat portion, as compared with the conventional example shown in (a) of FIG. It no longer flows into the center.

Due to the effects of the present invention according to the above two embodiments, the accuracy of controlling the central gas flow is improved. The core temperature is stable after the practice of the present invention, and is higher. In addition, ΔP / V decreased and became stable. For this reason, the frequency of wind reduction is reduced, and the hot metal production cost can be reduced. In addition, when the fixed position of the other end of the link connected to the raw material rectifying chute is variable and the charging is carried out in the center of the furnace and the wall of the furnace
Furthermore, central charging and furnace wall charging have become possible.

(Embodiment 3) FIG. 10 shows the accuracy of material drop position control by the chute type disclosed in Japanese Patent Laid-Open No. 49-23111 and the hopper type chute of the present invention shown in FIG.
It shows in comparison with. The experiment was carried out by charging the raw material with the turning radius rf of the turning chute 5 of FIG. 10 being constant, and collecting the raw material by a sampling box equipped with a large number of partition plates. The model used for the experiment is equivalent to the actual machine, the length of the swiveling chute is 4.0 m, the inner diameter of the hollow chute of the conventional example
The inner diameter of the discharge port of the small hopper type chute of the present invention is 1.0 m, which is 0.5 m.

As shown in FIG. 11, in the conventional example, the furnace radius component of the raw material falling velocity changes its direction only by the collision with the inner wall of the hollow chute, so the falling position is considerably closer to the center of the furnace with respect to the turning radius rf. The drop width is more than twice the inner diameter, which is quite large. Further, in the conventional example, the deposited shape is not centered, and a deviation in the circumferential direction occurs at the furnace top hopper. on the other hand,
According to the present invention, the raw material falling width is almost the same as the inner diameter,
The falling position also matches the turning radius rf.

FIG. 12 shows the difference in the change over time in the raw material flow rate between the conventional example and the present invention. At the outlet of the hopper type chute of the present invention, the raw materials are pressed against each other to form an arch structure, and the upper pressure is supported here, so the flow rate of the raw material depends on the inflow speed from the swirling chute and the storage amount in the hopper type chute. It is constant regardless of. Therefore, in the present invention, the raw material flow rate is more stable than in the conventional example, and as a result, the raw material is uniformly charged in the circumferential direction of the furnace.

Since the discharge amount is constant regardless of the storage amount in the small hopper type chute, the capacity may exceed the capacity of the hopper type chute and overflow depending on the charging speed from the turning chute. As a countermeasure, in addition to increasing the capacity of the hopper type chute, it is preferable to make the discharge diameter of the hopper type chute variable and set the discharge flow rate appropriately.

As an example of application to blast furnace operation, an internal volume of 4500N
The improvement effect in a blast furnace with a bell-less top charging device of m ³ is shown. As shown in Fig. 5, a small hopper-type chute with an outlet inner diameter of 0.5 m was attached to the tip of the swivel chute length of 4.0 m, and it was controlled so as to be vertically downward regardless of the tilt of the swivel chute. As this effect, FIG. 13 shows the deviation of the hot metal Si concentration according to the conventional method and the present invention, the deviation of eight skin flow thermometers indicating the uniformity in the circumferential direction of the upper part of the blast furnace, the deviation of the hot metal temperature, the hot metal temperature, the Si in the hot metal The changes in concentration, ΔP / V, and wind reduction frequency are shown for comparison. Since the balance of the charge in the circumferential direction is uniform, the deviation of the Si concentration in the hot metal, the deviation of the skin flow thermometer, and the deviation of the hot metal temperature are all small, and the hot metal temperature can be lowered. The Si concentration could be reduced.

As a result, the smelting cost in the lower step can be greatly reduced, and a great advantage is obtained. In addition, since the raw material with poor air permeability was prevented from flowing into the central part of the furnace due to the improvement of the raw material falling position control accuracy and the reduction of the kinetic energy at the time of raw material accumulation, ΔP / V decreased and the furnace condition became stable. The frequency was reduced, and the ironmaking cost could be reduced.

[0044]

As described above, according to the present invention, the following effects can be achieved. (1) In a blast furnace bellless type charging device in which a raw material straightening chute is attached to the tip of the swiveling chute, the raw material straightening chute does not need a special drive device by transmitting the tilting force of the swiveling chute to the raw material straightening chute by a link rod. Moreover, it is possible to maintain a constant angle regardless of the tilt angle of the turning chute. As a result, the pig iron manufacturing cost can be reduced at a low investment cost.

(2) By transmitting the tilting power of the turning chute to the raw material rectifying chute through the link, the raw material rectifying chute can be set in the designated direction corresponding to the tilting angle of the turning chute without a special drive device. As a result, it was possible to reduce the pig iron manufacturing cost with a low investment cost. (3) By using a small hopper type chute as the raw material straightening chute, the hot metal temperature can be lowered and the Si concentration in the hot metal can be reduced. As a result, the refining cost in the lower step can be significantly reduced, and a great advantage can be obtained. Further, since the raw material having poor air permeability was prevented from flowing into the central part of the furnace, ΔP / V was decreased and the furnace condition was stabilized, so that the frequency of wind reduction was decreased and the ironmaking cost could be decreased. .

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross section of a furnace top charging device of the present invention.

FIG. 2 is an explanatory view showing a raw material charging procedure via a raw material straightening chute by the link rod parallel type link mechanism of the present invention.

FIG. 3 is an explanatory view showing a raw material charging procedure via a raw material straightening chute by the link rod crossing type link mechanism of the present invention.

FIG. 4 is an explanatory view showing a raw material charging procedure via a raw material rectifying chute by the link rod position variable type link mechanism of the present invention.

FIG. 5 is a schematic view showing in cross section another furnace top charging device of the present invention.

FIG. 6 is a schematic view showing a conventional furnace top charging device.

FIG. 7 is a graph showing a comparison of transitions of furnace conditions by charging raw materials of the present invention and a conventional example.

FIG. 8 is a graph showing the charged product deposit shapes before and after the intensive charging of coke in the central portion of the conventional example and the example of the present invention.

FIG. 9 is a graph showing the charged product deposit shapes before and after charging the fine-grained ore into the furnace wall, comparing the conventional and present inventions.

FIG. 10 is a side view showing a conventional model and a scale model experimental device of the present invention in comparison.

FIG. 11 is a graph showing the relationship between the non-dimensional furnace port radial position and the weight specific gravity of the raw material, which are experimental results obtained by the scale model experimental device, in comparison between the conventional example and the inventive example.

FIG. 12 is a graph showing a transition of a raw material flow rate by the hopper type chute of the present invention.

FIG. 13 is a graph showing a comparison of transitions of furnace conditions when a raw material rectifying chute and a raw material using a hopper type chute of the present invention are charged into a conventional tip portion.

[Explanation of symbols]

 1 Furnace top hopper 2 Flow rate control gate 3 Collecting chute 4 Vertical chute 5 Swiveling chute 6 Raw material 7 Raw material rectifying chute 8 Blast furnace 9 Hopper type chute 10 Link rod 11 First connecting pin 12 Second connecting pin 13 Third connecting pin 14 No. 4 Connecting pin 15 Inner furnace contents 16 Lift block 17 Lift device 18 Hopper type chute

Claims (4)

[Claims] 1. A vertical chute for guiding discharged material by using a flow rate adjusting gate provided in a lower part of the furnace top hopper, and a first connecting pin provided in a lower part of the vertical chute so as to be tiltable at one end by driving. A swing chute supported by a part,
A bellless furnace top charging device for a rigid reactor, comprising a raw material rectifying chute supported via a second connecting pin provided at the other end of the swirling chute, wherein the first connecting pin and the second connecting pin are provided. A link rod is arranged along the upper side of the straight line connecting the two, and one end of the link rod is connected to the vertical chute through the third connecting pin, while the other end is rectified through the fourth connecting pin. Forming a link mechanism for operation by connecting to a chute for use, and transmitting the tilting driving force of the turning chute to the raw material straightening chute via a link rod of the linking mechanism for operation, and the raw material regardless of the tilting angle of the turning chute. A bellless furnace top charging device for a rigid furnace, characterized in that the rectifying chute is configured to always maintain a constant angle. 2. An actuating link mechanism is formed by arranging a link rod by intersecting the straight line connecting the first connecting pin and the second connecting pin instead of along a straight line, and pivoting via the link rod of the actuating link mechanism. The tilt driving force of the chute is transmitted to the raw material straightening chute, and the tilt angle of the raw material straightening chute is closer to the furnace center direction with respect to the vertical lower line when the raw material is centrally charged, and the vertical lower line when the raw material is peripherally charged. The bellless type furnace top charging device for a rigid furnace according to claim 1, wherein the bellless type furnace top charging device is configured to tilt toward the furnace wall. 3. The tilting angle of the raw material straightening chute can be changed during the operation of the furnace by making the fixed position of the third connecting pin on the vertical chute side of the link rod connected to the raw material straightening chute movable. The bellless furnace top charging device for a rigid reactor according to claim 1 or 2, wherein 4. The small hopper type chute is used as the raw material straightening chute, and the hopper type chute is supported by a connecting pin at the tip of the turning chute without disposing a link rod. Bellless furnace top charging device for a rigid furnace as described.