JP3552257B2 - Bell-less furnace top charging device for rigid furnaces - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a bellless for a rigid furnace, which is arranged on a furnace top of a blast furnace or the like and is capable of optimizing a raw material distribution in a furnace radial direction which is charged into a furnace through a swirling chute having a variable swirling radius. The present invention relates to a furnace top charging device.
[0002]
[Prior art]
In operation of the blast furnace as a hard-type furnace, the distribution of the raw material charge (coke and ore) at the furnace top portion radially, i.e. the particle size distribution and thickness distribution _{(L O / L C: L} O is The ore layer thickness, L _C is the coke layer thickness) is properly controlled to obtain gas flow distribution, heat flow ratio distribution (ratio of heat capacity flow rate of solid to heat capacity flow rate of gas), and the resulting reduction of ore. It is important to make the dissolution state uniform in the circumferential direction and to have an optimal distribution in the radial direction. For this purpose, it is necessary to flexibly control the distribution of the charge at the furnace top with high precision in response to the constantly changing operating state of the blast furnace.
[0003]
As a means for controlling the distribution of the charged material at the furnace top, a bell-type charging device has been conventionally known, and the distribution of the charged material such as coke and ore is determined by a stock line and a charged amount of I batch. The optimization was performed in consideration of the falling motion of the charged particles, the reflection on the armor, and the rolling behavior on the charged surface depending on the charging sequence, the position of the movable armor, and the like.
[0004]
Further, as a distribution control means for increasing the degree of freedom of the distribution control of the raw material charge, there is a bell-less swivel chute, and various kinds of distribution control are realized by changing the number of turns of the swivel chute and the angle of the swivel chute. Was.
However, in any of the above charging means, the charged particles are placed on the sliding surface of the charging device (in the case of a bell type, the sliding surface of a bell cup, and in the case of a bellless charging device, the sliding surface of a turning chute). Along the sliding surface, dropped freely from the tip of the sliding surface, and passed through rolling motion on the pile to determine the layer thickness and the particle size distribution.
[0005]
However, such a method of controlling the distribution of the burden is
(1) Since the free fall distance is long, there is a risk of powdering when dropped.
(2) Since the free-fall direction is the extension direction of the slip surface, a strong centrifugal inertia force at the time of drop breaks the previous charging surface and changes the layer thickness distribution.
(3) In the case of (2), the charged particles may be classified in the radial direction by the particle size distribution of the charged material forming the old piled surface.
(4) Further, when the charging amount of the I-batch is changed or the height of the old piling surface (stock line) is changed, the distribution of the charged material is extremely changed and the stability against disturbance is poor.
(5) The raw material drop position cannot be estimated accurately.
There were problems such as.
[0006]
As a charging device for solving such a problem, Japanese Patent Application Laid-Open No. 49-2311 discloses a rotating rotation device in which a position variable mechanism at the tip and a vertical chute for material rectification are mounted at the tip of the chute. .
FIG. 4 is a schematic view of a raw material charging device disclosed in the above-mentioned patent publication, and a vertical chute 4 is attached to a chute rotation device 11. The parent chute 5a is supported on the support member 19 attached to the vertical chute 4 via the pin 20, and a child chute 5b sliding on the parent chute 5a is mounted. A turning chute is formed by supporting a raw material rectifying chute 7a at the tip of the child chute 5b via a pin 21.
[0007]
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 chute 7a slides down the child chute 5b. Is charged into the blast furnace 8 via
At this time, the adjustment of the feeding position of the raw material charged in the furnace in the furnace radial direction is performed by sliding the child chute 5b back and forth along the parent chute 5a.
[0008]
However, in the furnace top charging apparatus disclosed in JP-49-23111 discloses that shown in FIG. 4, above problems are reduced,
(1) Uniform drop position in the circumferential direction (2) Raw material loading by narrow falling width (3) Uniform drop position by vertical falling regardless of raw material surface height before raw material loading ,
(1) The mechanism for changing the position of the child chute disposed at the tip of the turning rotation device requires a complicated structure, and as a device placed in a high-temperature, dusty environment, maintenance management is complicated. It becomes.
(2) The raw material rectification chute is vertical so that particles to be newly charged on the old piled surface of the V-shaped or M-shaped furnace interior material can be distributed with high accuracy over the entire furnace radial direction. it is preferable that not have the proper angle from the downward direction.
(3) Since the swivel chute itself cannot be set up in the vertical direction, it is not possible to perform special charging such that the charge is distributed only in the center of the rigid furnace.
(4) The change in the positional relationship between the direction of the turning chute and the hopper position generated when the chute rotates, and the change in the charging rate of the charge caused by the variation in the slip velocity of the charged particles on the turning chute. Time change (variation) cannot be prevented.
(5) Since the elimination of the velocity component in the furnace radial direction is insufficient, there is room for improvement in the accuracy of accumulating at the target drop position.
There were problems such as.
[0009]
[Problems to be solved by the invention]
The present invention solves the above problems, that is,
(1) The charging device itself has a structure as simple as possible,
(2) It is possible to incline the raw material rectification chute at an appropriate angle with respect to the old piled surface of the V-shaped or M-shaped furnace interior charge,
(3) It is possible to perform a special charge such that the charge is distributed only in the center of the rigid furnace without setting the turning chute itself in the vertical direction,
(4) The change in the positional relationship between the direction of the turning chute and the hopper position generated when the chute rotates, and the change in the charging rate of the charge caused by the variation in the slip velocity of the charged particles on the turning chute. Time change (variation) can be prevented,
(5) Accumulate more accurately at the target drop position.
It is an object of the present invention to provide a bellless furnace top charging device for a rigid furnace.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a vertical chute for guiding a raw material discharged using a flow rate adjusting gate provided at a lower part of a furnace top hopper, and a first chute provided at a lower part of the vertical chute. A rigid type having a turning chute supported at one end so as to be tiltable by driving via a connecting pin, and a raw material rectification chute supported via a second connecting pin provided at the other end of the turning chute. In a bellless type furnace top charging apparatus for a furnace, a link rod is disposed so as to intersect a straight line connecting the first connecting pin and the second connecting pin, and one end of the link rod is vertically chuted via the third connecting pin. While the other end is connected to a raw material rectifying chute via a fourth connecting pin to form an operating link mechanism, and the tilting driving force of the turning chute is provided via a link rod of the operating link mechanism. Transmitted to the raw material rectification chute, the furnace wall direction with respect to the vertical downward direction line when the tilt angle of the material rectification chute into the furnace center direction closer to the vertical downward line when the raw material center charging, also material surrounding charged A bellless type furnace top charging device for a rigid furnace, characterized in that the device is configured to be tilted closer .
[0012]
According to the second aspect of the present invention, the fixed position of the third connection pin on the vertical chute side of the link rod connected to the raw material rectification chute can be moved, so that the raw material rectification chute can be tilted during the furnace operation. it is a hard-type furnace for bell-less furnace ItadakiSo inserting apparatus according to claim 1 Symbol placement, characterized by being configured to be able to change the angle.
[0013]
[Action]
FIG. 1 is a schematic view of a bell-less type furnace top charging apparatus according to claim 1 of the present invention, wherein the gas is discharged using flow rate control gates 2 respectively disposed below two furnace top hoppers 1. A vertical chute 4 having a collecting chute 3 for guiding the raw material 6, a revolving chute 5 having one end supported at a lower portion of the vertical chute 4 by a drive via a first connecting pin 11 so as to be tiltable, and a revolving chute 5 that have a material rectification chute 7 in which the second is supported by a connecting pin 12 provided at the other end of the.
[0014]
In the present invention, the link rod 10 is disposed so as to cross the straight line A connecting the first connection pin 11 and the second connection pin, and one end of the link rod 10 is connected to the vertical chute 4 via the third connection pin 13. And the other end is connected to the raw material rectifying chute 7 via the fourth connecting pin 14 to form an operating link mechanism .
[0020]
FIG. 2 shows a procedure for charging the raw material 6 while changing the inclination angle θ of the revolving chute 5 according to the first aspect of the present invention. In FIG. 2 , a link rod 10 is disposed so as to intersect a straight line A connecting the first connection pin 11 and the second connection pin 12, and one end of the link rod 10 is placed above the first connection pin 11. While the other end is connected to the raw material rectifying chute 7 via a fourth connecting pin 14 located below the second connecting pin 12. An actuation link mechanism is formed.
[0021]
The driving force of a tilt driving device (not shown) for tilting the turning chute 5 through an operating link mechanism formed by using the link rod 10 is transmitted to the raw material rectification chute 7 by the link rod 10, whereby the raw material is adjusted. This is to change the inclination angle θ ₁ of the rectifying chute 7.
That is, when charging the raw material 6 through the inclined surface of the revolving shoot 5 as shown in FIG. 2 (a) to the furnace center portion near the furnace interior container 15 to reduce the inclination angle θ of the turning chute 5 the second connecting point 12 and the fourth connecting point 14 to move so are the first connection point 11 and third connection point 13 which is fixed by the vertical chute 4 in origin as shown in the FIG. 2 (a) ' in a state in which intersection of the link rod 10 with respect to the straight line a connecting the first connecting pin 11 and the second connecting pin 12 C is positioned at the top as shown in the FIG. 2 (a) 'raw materials for rectification The chute 7 is inclined toward the center with respect to the vertical direction by the link rod 10.
[0022]
In addition, when the slanting angle θ of the revolving chute 5 is gradually increased when charging the furnace interior charge 15 into the furnace radially intermediate portion, the slant angle θ ₁ of the raw material rectification chute 7 is reduced by the link rod 10. As shown in FIG. 2 (b), the raw material rectification chute 10 is in a vertical (θ ₁ = 0) state, and the raw material 6 is charged into the intermediate portion in the furnace radial direction. Further material rectification chute 7 by the link rod 10 when tilting as the inclination angle θ becomes large swivel chute 5 is tilted in the furnace wall direction opposite to the blast furnace 8, the inclination angle as shown in FIG. 2 (c) Raw material 6 is charged peripherally at θ ₂ .
[0023]
In this case, the intersection C of the straight line A and the link rod 10 gradually moves downward as shown in FIGS. 2 (a) ', (b)' and (c) ', and the charge of the raw material rectifying chute 7 is changed. The discharge direction can be tilted toward the center with respect to the vertical lower line when charging at the center, and tilted toward the furnace wall with respect to the vertical lower line during peripheral charging. Therefore, in this case, it is possible to perform a special charging such that the charge is distributed only in the center of the hardened furnace without standing the turning chute itself in the vertical direction. Even if it is shorter than the furnace radius at the furnace top, it is possible to deposit the charge even around the furnace wall.
[0024]
FIG. 3 is a schematic view showing an embodiment corresponding to the present invention described in claim 2, wherein a connecting pin 13 provided at one end of a link rod 10 having a fixed length is moved vertically along a vertical chute 4. It is a possible mechanism. Although the vertical movement mechanism is not specified, for example, a guide (not shown) is provided on the side surface of the vertical chute 4 in the vertical direction, and an elevating block 16 fitted to the guide is provided. The lifting block 16 is provided with a connecting pin 13 for connecting the link rod 10, and the lifting block 16 is moved up and down by a lifting device 17 which is suspended from above.
[0025]
Raw rectification chute 7 via a link rod 10 when the lifting block 16 comprises a connecting pin 13 is positioned at the lower end of the vertical chute 4 by the elevating device 17, as shown in FIG. 3 (a) with respect to the vertical downward Tilt toward the furnace center. When the elevating block 16 is positioned at the middle of the vertical chute 4 in the height direction, the raw material rectifying chute 7 tilts to a substantially vertical state via the link rod 10. Further, when the lifting block 16 is positioned at the upper end of the vertical chute 4, the raw material rectification chute 7 tilts vertically downward toward the furnace wall via the link rod 10.
[0026]
Intermediate portion such lifting block 16 from the lower end of the vertical chute 4, further raw material discharge direction of the raw material rectification chute as shown in FIG. 3 Moving to the upper end portion (a) 'and (b)' It can be changed freely during the furnace operation.
[0027]
Therefore, in this case, as compared with the present invention shown in FIG. 2, the special equipment such as distributing the charge only in the center of the rigid furnace without setting the swivel chute itself in the vertical direction is extremely extreme. Even if the length of the swirling chute is extremely short as compared with the radius of the furnace at the furnace top, it is possible to accumulate the charge around the furnace wall .
[0033]
【Example】
Shows the improvement in blast furnace having a bell-less furnace ItadakiSo inserting apparatus of the inner volume of 4500 nm ^3. A length of about 1.5m on the tip of the turning chute length 4m, attached to the link rod and co for driving the feed rectification chute having an inner diameter of 0.5m as shown in FIG.
[0035]
Link to next, raw material rectification chute furnace center side when the tilt angle is small, the turning chute as shown in FIG. 2, as a raw material rectifier chute when a large tilting angle of the turning chute faces the furnace wall side The operation was performed by changing the length and the connection position of the raw material rectification chute.
[0036]
FIG. 5 shows the accumulated shape of the charge when coke is intensively charged at the center. Although the conventional as shown in FIG. 5 (a) falling position of the coke had been off-center, coke began to推積the heart by the present invention as shown in FIG. 5 (b).
FIG. 6 shows the piled shape before and after charging the fine ore into the furnace wall. By raw rectification chute faces the furnace wall side, compared with the conventional example shown in (a) of FIG. 6, in the present invention shown in (b), fine ore is to ride securely on the flat portion, Stopped flowing into the center.
[0037]
By the effect of the present invention by the above-described real施例was improved core gas flow control accuracy. The temperature at the center is stable after the present invention has been performed, and has been relatively high. Further, ΔP / V also decreased and became stable. For this reason, the frequency of wind reduction was reduced, and the manufacturing cost of hot metal could be reduced. In addition, when the fixed position of the other end of the link connected to the raw material rectification chute is made variable and inserted into the furnace center and the furnace wall, the center charging and the furnace wall charging can be further performed.
[0044]
【The invention's effect】
As described above, according to the present invention, the following effects can be achieved .
[0045]
By transmitting the tilting force of the swivel chute feed rectification chute by a link, the raw material rectification chute can be specified direction corresponding to the tilt angle of the turning chute to a special drive without. As a result, it was possible to lower the iron making cost with a low investment cost .
[Brief description of the drawings]
FIG. 1 is a schematic view showing a furnace top charging device of the present invention in cross section.
FIG. 2 is an explanatory view showing a raw material charging procedure via a raw material rectifying chute by a link rod crossing type link mechanism of the present invention.
FIG. 3 is an explanatory view showing a raw material charging procedure via a raw material rectifying chute by a link rod position variable link mechanism of the present invention.
FIG. 4 is a schematic view showing a conventional furnace top charging device.
FIG. 5 is a graph showing a comparison between a conventional example and an example of the present invention in terms of the charged material accumulation shape before and after the case where coke is intensively charged in the center.
FIG. 6 is a graph showing a comparison between the prior art and the present invention in terms of the charge accumulation shape before and after charging the fine ore into the furnace wall .
[Explanation of symbols]
1 furnace top hopper 2 flow rate control gate 3 collecting chute 4 vertical chutes 5 swivel chute 6 material 7 material rectifier chute 8 blast furnace
10 Link rod
11 1st connection pin
12 Second connection pin
13 Third connection pin
14 4th connecting pin
15 Furnace interior
16 Lift block
17 lifting equipment
19 support members
20 pins
21 pin

Claims (2)

A vertical chute for guiding the discharged material using a flow rate adjustment gate provided at the lower part of the furnace top hopper, and one end supported by a drive via a first connecting pin provided at a lower part of the vertical chute so as to be tiltable by driving. In a bellless furnace top charging apparatus for a rigid furnace, comprising a turning chute and a raw material rectification chute supported via a second connecting pin provided at the other end of the turning chute, A link rod is disposed so as to intersect a straight line connecting the second connection pin and one end of the link rod is connected to a vertical chute via a third connection pin, while the other end is connected via a fourth connection pin. linked to raw rectified chute forms the actuating link mechanism, it transmits a tilting driving force of the swivel chute feed rectification chute via a link rod of the actuating link mechanism, the raw material rectification chute The tilt angle in the furnace center direction closer to the vertical downward line when the raw material center charging, also when the material around charging is characterized by being configured so as to tilt the furnace wall direction closer to the vertical downward line Bell-less furnace top charging device for rigid furnaces. A structure in which the fixed position of the third connection pin on the vertical chute side of the link rod connected to the raw material rectification chute can be moved so that the tilt angle of the raw material rectification chute can be changed during furnace operation. Ken furnace for bell-less furnace ItadakiSo inserting apparatus according to claim 1 Symbol mounting characterized.

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