JPH04272111A - Device for charging coke into bell-type blast furnace core - Google Patents

Abstract

PURPOSE:To surely charge coke into the core of a blast furnace so that a gas flows down through the center of the furnace. CONSTITUTION:Coke and ore are alternately charged from a large bell 3 to form coke layers and ore layers in a blast furnace. In this case, a part of coke falling down from the large bell 3 is received and stored in a cylindrical chute 5 provided in the space in the furnace. The amt. of coke received in the chute 5 is measured by the strain gages 101A and 101B stuck to the upper and lower faces of the chute 5 close to its supporting part. After coke is completely charged into the furnace from the large bell 3, the coke stored in the chute 5 is introduced into the furnace core, and then ore is charged from the large bell. As a result, a continuous coke layer is formed at the furnace core, the gas flows down through the center of the furnace, and the furnace conditions are stabilized.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention involves forming an almost continuous coke layer in the furnace core when coke and ore are alternately charged into a blast furnace to form a coke layer and an ore layer.
The present invention relates to an improvement in a coke core charging device for a bell-type blast furnace, which is capable of maintaining stable furnace conditions by centralizing the gas flow in the blast furnace.

0002

[Prior Art] When coke layers and ore layers are alternately stacked in a blast furnace, a nearly continuous coke layer is formed in the furnace core, and the cohesive zone is reversed by centralizing the gas flow in the blast furnace. It is known to maintain the V-shape in order to stabilize the condition of the blast furnace. For example, Utsuko Sho 61-42896
The publication states that when coke and ore are alternately charged from the top of the blast furnace to stack a coke layer and an ore layer, the coke is divided into two systems, and the coke from the first system is charged so that it covers all the surface layer of the ore. A series of methods have been proposed that consist of forming a coke layer in the core of the ore layer by charging the coke layer into the core of the ore layer, and then charging coke from the second system into the center of the charged coke layer. has been done. In each of these methods, a charging chute exclusively for coke is installed in the furnace core from outside the furnace top shell, and coke is charged into the furnace core from outside the furnace through the charging chute. It is.

[0003] A device equipped with such a charging chute is transported from a charging conveyor 34 provided above a bell-type blast furnace having a small bell 2 and a large bell 3, as shown in FIG. 4, for example. Coke is stored in a storage hopper 36 by switching a switching chute 35. And storage hopper 3
After the coke cut out from the coke 6 is weighed in the lower weighing hopper 37, the inlet seal valve 39 and the inlet gate valve 38 are opened in this order, and the coke is temporarily stored in the equalizing pressure hopper 40.

When charging the coke in the pressure equalization hopper 40 into the blast furnace, the inlet gate valve 38 and the inlet seal valve 39 are closed to equalize the pressure in the pressure equalization hopper 40 and the furnace. After that, the outlet seal valve 42 and the outlet gate valve 41 are opened in this order, and the coke in the pressure equalization hopper 40 is charged from outside the furnace into the furnace via the charging chute 43 into the furnace core. is something

[0005]

Problems to be Solved by the Invention The above-mentioned prior art has the following problems. (1) It is necessary to install a storage hopper, a weighing hopper, an equalizing pressure hopper, a charging chute, etc. on the downstream side of the switching chute provided at the head of the charging belt conveyor. Each outlet requires a gate valve and a seal valve, making the device complex and expensive to install.

(2) In order to charge the coke stored outside the furnace into the furnace, a pressure equalizing and exhausting hopper is required to have a function of equalizing and exhausting the pressure. Operation is required. (3) Since it is necessary to store coke for charging the furnace core by switching the switching chute provided in the head of the charging belt conveyor, the operation schedule for conveying coke from the charging belt conveyor to the blast furnace is restricted.

(4) A switching chute is provided at the top of the bell-type charging device, and a separate system of charging device is provided for coke for the furnace core. Therefore, in order to grasp the charging amount of another system, it is necessary to install a weighing device in the middle of the charging device to measure the charging amount, which poses the problem of increased equipment costs. The present invention solves the problems of the prior art, and makes it possible to easily charge coke into the furnace core using a simple device, as well as grasp the amount of coke charged into the furnace core and its charging status. It is an object of the present invention to provide a coke oven charging device for a bell-type blast furnace.

[0008]

[Means for Solving the Problems] To achieve the above object, the present invention provides a furnace core that is inclined downward from outside the furnace top shell to the inside of the furnace below the large bell of a bell-type blast furnace. A cylindrical chute leading to the top of the furnace is supported by a tube seat provided on the top shell of the furnace, and the cylindrical chute is provided with a coke receiving opening on the top surface in line with the locus of coke falling from the large bell, and has an open tip. a coke discharge opening, and a chute top cover that covers the top surface of the cylindrical chute and is slidable in the longitudinal direction; An opening and a tip gate are integrally provided, and a rod connected to the outside of the furnace of the chute upper lid via a pin is taken out of the furnace through a sealing mechanism provided at the outside end of the cylindrical chute, and the rod is removed from the furnace. A telescopic drive device for moving the chute top cover in the furnace radial direction is connected to the outer end of the furnace, and a telescopic drive device is connected to the outer end of the chute to move the chute top cover in the furnace radial direction. , a coke oven core in a bell-type blast furnace, characterized in that a strain gauge is attached to detect the amount of coke received in the cylindrical chute when it falls from the bell and the amount of change in coke when the core is charged from the cylindrical chute. It is a charging device.

In addition, in the present invention, a cylindrical chute is provided below the large bell of the bell-type blast furnace, and extends from outside the top shell to the furnace core in the furnace space by slanting downward from outside the top shell to the inside of the furnace. A coke receiving port is provided on the upper surface of the outer periphery of the cylindrical chute at a position where the coke falls from the large bell, and a coke discharge port is provided on the upper surface of the closed tip, and The outside of the furnace is supported by a bearing, and a rotary drive device is provided for inverting the cylindrical chute around its axis, and either the upper surface or the lower surface of the chute on the inside of the furnace near the support part of the cylindrical chute by the tube seat is provided. A coke oven core in a bell-type blast furnace has strain gauges attached to one or both upper and lower surfaces to detect the amount of coke received into the cylindrical chute when it falls from the bell and the amount of change in coke when the core is charged from the cylindrical chute. It can also be a charging device.

0010

[Operation] When coke and ore are alternately charged into the blast furnace from the large bell of a bell-type blast furnace to form a coke layer and an ore layer, a portion of the coke that falls from the large bell during coke charging is transferred to the blast furnace. The coke is received and stored in a cylindrical chute arranged in the inner space, and after completion of charging the coke into the furnace from the large bell, the coke stored in the cylindrical chute is charged into the furnace core, and then Ore is charged into the furnace from the large bell.

[0011] In addition, in a coke core charging device for a bell-type blast furnace, a chute that extends from the outside of the top shell to the furnace core in the furnace space by sloping downward in the direction of the furnace interior is attached to the top shell. It is attached with a support beam. Therefore, tensile stress acts on the upper surface of the inner chute of the chute support, and compressive stress acts on the lower surface, and the amount changes depending on the presence or absence of coke in the chute. From the above, the amount of coke in the chute can be determined by attaching a strain gauge to one or both of the upper and lower surfaces of the chute inside the furnace near the chute support, and correlating the change in strain amount with the calculated stress value. become. Further, if no change is observed in the amount of strain on the strain gauge during operation using the coke furnace core charging device, clogging of coke in the chute is predicted, and trouble can be detected early.

0012

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. 1 and 2 show an embodiment of the present invention. In FIG. 1, raw materials such as coke and ore are loaded into the furnace by opening and closing a large bell 3 installed at the top of a bell-type blast furnace. The raw material that is charged into the furnace but falls from the large bell 3 is moved back and forth in the position of the armor plate 4 to adjust the position of the raw material that is charged into the furnace, as in a normal bell type blast furnace.

In the present invention, the cylindrical chute 5 is attached to the top shell 1 below the large bell 3 so as to be inclined downwardly toward the inside of the furnace from outside the top shell 1 so as to face the furnace core in the furnace interior space. It is supported by a provided tube seat 6 using bolts. The cylindrical chute 5 is provided with a coke receiving opening 7 on its upper surface in line with the locus of the coke falling from the large bell 3, and has a coke discharge opening 8 with its tip open. Here, the capacity of the cylindrical chute 5 is determined by the amount of core coke determined by the blast furnace operating conditions.

A chute upper lid 9 is provided which covers the upper surface of the cylindrical chute 5 and is slidable in the longitudinal direction. A tip gate 11 corresponding to the coke discharge opening 8 of the chute 5 is integrally provided. A rod 13 connected to the outside of the furnace of the chute top lid 9 via a pin 12 is taken out of the furnace through a sealing mechanism 14 provided at the outside end of the cylindrical chute 5, and the chute top lid is connected to the outside end of the rod 13. A telescopic drive device 15 (here, a power cylinder is used) is connected to the telescopic drive device 15 (here, a power cylinder is used) for moving the furnace 9 in the radial direction of the furnace. Note that the telescopic drive device 15 is installed on a pedestal 16 attached to the furnace top shell 1.

The pin 12 connecting the chute top cover 9 and the rod 13 is adapted to move along an elongated hole 17 provided in the cylindrical chute 5, as shown in FIG. 2(a). The length of the elongated hole 17 is set to at least correspond to the stroke of movement of the chute top cover 9. In addition, a protective lining 9 is provided on the upper surface of the outer end of the chute upper cover 9.
It is preferable to install a protective lining 9a to prevent the chute top cover 9 from being worn out by ore that falls from the large bell 3 when the chute top cover 9 is pushed into the inside of the furnace to block the coke receiving opening 7 of the cylindrical chute 5. prevent by.

It is preferable that the chute top lid 9, which has a U-shaped cross section and covers the upper surface of the cylindrical chute 5, can be covered from above the cylindrical chute 5, as shown in FIG. 2(b).
By doing so, it becomes possible to stably slide the chute top cover 9 in the longitudinal direction of the cylindrical chute 5 without causing sideways vibration. In addition, a notch 18 is formed in the longitudinal direction of the upper surface of the cylindrical chute 5 as shown in FIG. This allows the distal gate 11 to move.

Furthermore, strain gauges 101A and 101B are respectively attached to the upper and lower surfaces of the chute 5 inside the furnace near the support part of the tube seat of the cylindrical chute 5, so that the cylindrical chute 5 when falling from the large bell 3 The amount of coke received into the reactor and the amount of coke change during charging from the cylindrical chute 5 to the furnace core are measured by a strain measuring device 103 via a lead wire 102. Note that depending on the case, the measurement may be made by attaching it to only either the upper surface or the lower surface.

Next, the operation of the present invention will be explained. In the charging schedule of a bell-type blast furnace in which ore and coke are charged alternately, the chute upper cover 9 is expanded and retracted before the large bell 3 is opened and coke is charged. The driving device 15 lifts the chute top cover 9 toward the outside of the furnace to align and open the opening 10 of the chute top cover 9 with the coke receiving opening 7 of the cylindrical chute 5, and at the same time, the tip gate 11 of the chute top cover 9 closes the coke discharge opening 8 of the cylindrical chute 5. cut off.

In this way, when the large bell 3 is opened, a part of the coke 20 that falls is received from the coke receiving opening 7 into the cylindrical chute 5 and stored therein, and at the same time covers all the ore layer in the furnace that was previously charged. Coke is charged into a furnace to form a coke layer A. At this time, coke receiving opening 7
The amount of coke received in the cylindrical chute 5 is measured by detecting the amount of strain by strain gauges 101A and 101B, and by correlating the change in the amount of strain with a calculated stress value by a strain amount measuring device 103.

When the charging of coke from the large bell 3 into the furnace is completed, the chute upper lid 9 is pushed inward by the telescopic drive device 15, the opening 7 is shifted from the coke receiving opening 10 of the cylindrical chute 5, and the chute upper lid 9 is removed. At the same time, the tip gate 11 of the chute upper cover 9 is separated from the coke discharge opening 8 of the cylindrical chute 9 and opened, and the coke stored in the cylindrical chute 5 is charged into the furnace core to form a coke layer in the furnace. A furnace core coke layer B is formed on A.

At this time, since the amount of coke charged to form the furnace core layer B is measured by the strain measuring device 103, the ratio of the charged amount of coke layer B to coke layer A can be accurately grasped. can do. In the unlikely event that the inside of the cylindrical chute 5 is clogged and the accumulated coke cannot be discharged from the coke discharge opening 8, the trouble can be detected from the amount of change in coke detected by the strain measuring device 103, and the trouble can be resolved at an early stage. Countermeasures can be taken.

When ore is charged from the subsequent large bell 3, the coke receiving opening 7 of the cylindrical chute 5 is closed to the chute upper lid 9.
If the ore is charged as usual while maintaining the shut-off state, an ore layer having a coke layer B is formed in the core of the ore layer. By repeating the above operations, a substantially continuous coke layer is formed in the furnace core, and the ventilation of the furnace core is improved.

FIG. 3 shows another embodiment of the present invention, in which a cylindrical chute 5 is supported via a tube seat 6 provided on the furnace top shell 1 and is tilted downward from outside the furnace. It is placed near the furnace core in the inner space. The tip of the cylindrical chute 5 is closed, and a coke receiving opening 7 is provided on the upper surface of the outer periphery at a position where the coke falls from the large bell 3, and a coke discharge opening 8 is provided on the upper surface of the tip.

A coke collision plate 32 is provided in the coke receiving opening 7 and projects from the outer peripheral surface of the cylindrical chute 5 and is inclined. At the same time, the surroundings of the coke receiving opening 7 are as shown in Fig. 3(b).
It is preferable to form the cross section into a U-shape as shown in ). With this structure, the coke falling from the large bell 3 is guided smoothly into the cylindrical chute 5 by the coke collision plate 32, and the U-shaped coke receiving opening 7 prevents the coke from spilling. Make it. Note that FIG. 3(c) shows a cross section of the body of the cylindrical chute 5, and the part has a circular shape.

Further, a cylindrical chute 5 is provided at the discharge port 8 at the tip.
A coke discharge tube 33 is provided that projects upwardly from the outer peripheral surface of the coke, and when the coke is stored in the cylindrical chute 5 from the coke receiving opening 7, the coke is ejected from the coke discharge opening 8 to the outside of the chute 5 due to inertial force. In addition, when the cylindrical chute 5 is turned over, coke should not be allowed to flow into the chute 5.
It is designed to be quickly discharged outside.

A sealing mechanism 14 is inserted in the tube seat 6 through which the cylindrical chute 5 passes to seal the gas inside the furnace, and the outside of the cylindrical chute 5 is connected to the tube seat 6 for installation. It is rotatably supported by a bearing 19. The outer end of the cylindrical chute 5 is connected to a rotary drive device 21 supported by a bracket 20, and by driving the rotary drive device 21, the coke receiving opening 7 and the coke discharge opening 8 of the cylindrical chute 5 are opened. Can be switched upward or downward.

Further, strain gauges 101A and 101B are respectively attached to the upper and lower surfaces of the chute 5 inside the furnace near the support part of the tube seat of the cylindrical chute 5, so that the cylindrical chute 5 when falling from the large bell 3 As in the previous embodiment, the amount of coke received into the reactor and the amount of change in coke during charging from the cylindrical chute 5 to the furnace core are measured by a strain measuring device 103 via a lead wire 102. Note that depending on the case, the measurement may be made by attaching it to only either the upper surface or the lower surface.

Next, the procedure for charging coke into the core of the blast furnace will be explained. When the raw material charging enters the coke charging pattern and the large bell 3 is opened as shown by the two-dot chain line from the closed solid line, the large bell 3 is opened as shown by the double-dashed line. The coke on Bell 3 falls into the furnace. At this time, since the coke receiving opening 7 is provided at the coke falling locus position on the upper surface of the outer periphery of the cylindrical chute 5, a part of the coke is received from the coke receiving opening 7, and since the tip is closed, the received coke is It accumulates in the cylindrical chute 5 due to the angle of repose. At this time, the amount of coke received from the coke receiving opening 7 into the cylindrical chute 5 is detected as the amount of strain by the upper and lower strain gauges 101A and 101B, and the change in the amount of strain is calculated as a stress value by the strain amount measuring device 103. It is measured by making it correspond to

After all of the coke on the large bell 3 is charged into the furnace, the cylindrical chute 5 is moved to the rotary drive device 21.
When it is driven and rotated 180 degrees as shown in FIG. 3(b), the coke discharge opening 8 at the tip faces downward, and the coke accumulated in the cylindrical chute 5 is discharged from the coke layer A stacked inside the furnace. Furnace core charged coke layer B charged on the core
A small mountain is formed.

At this time, since the amount of coke charged to form the coke layer B in the furnace core is measured by the strain measuring device 103, the amount of coke charged to form the coke layer B in the furnace core is
It is possible to reliably grasp the charging ratio. In the unlikely event that the inside of the cylindrical chute 5 is clogged and the accumulated coke cannot be discharged from the coke discharge opening 8, the trouble can be detected from the amount of change in coke detected by the strain measuring device 103, and measures can be taken to resolve the trouble at an early stage. can be taken.

Next, when the raw material charging is in the ore charging pattern, the coke receiving port 7 and coke discharge opening 8 of the cylindrical container 5 are kept facing downward as shown in FIG. 3(b).
The entire amount of ore that falls from the large bell 3 falls into the furnace and flows toward the furnace core, but a small mountain of coke charged to the furnace core is formed in the furnace core, so the ore is prevented from flowing into the furnace core. It will be done.

By repeating such raw material charging, a columnar continuous coke layer is formed in the furnace core of the coke layer and ore layer stacked in the furnace, so that the gas flow in the furnace is made into a central flow. can do. When ore is subsequently charged from the large bell 3, the coke receiving opening 7 and coke discharge opening 8 of the cylindrical chute 5 are kept facing downward and the ore is charged as usual. An ore layer with a coke layer B is formed.

By repeating the above-described operations, a substantially continuous coke layer is formed in the furnace core, and the ventilation of the furnace core is improved.

[0034]

As described above, according to the present invention, coke can be easily received and discharged into the compact cylindrical chute facing the furnace core below the large bell. Furthermore, since the amount of coke received in the cylindrical chute is measured, the amount of coke to be charged into the furnace core can be accurately determined.

[0035] Therefore, unlike the prior art, hoppers such as storage hoppers and equalizing and exhausting pressure devices are not required, so equipment costs can be reduced. In addition, since coke can be stably charged into the furnace core without any restrictions on the operation schedule of the charging belt conveyor, the gas flow in the blast furnace becomes a central flow, and good furnace conditions can be maintained. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along arrows A, B, and C in FIG. 1;

FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a conventional example.

[Explanation of symbols]

1 Furnace top iron skin 2 Small bell 3 Big bell 4 Armor plate 5 Cylindrical chute 6　Pipe seat 7 Coke receiving opening 8 Coke discharge opening 9 Chute top lid 10 Opening (chute) 11 Tip gate 12 pin 13 Rod 14 Seal mechanism 15　Telescopic drive device 16 Mount 17 Long hole 18 Notch 19 Bearing 20 Bracket 21 Rotary drive device

Claims (2)

[Claims] [Claim 1] A pipe in which a cylindrical chute is provided on the top shell of a bell-type blast furnace below the large bell and slopes downward from outside the top shell to the inside of the furnace and reaches the furnace core in the furnace interior space. The cylindrical chute is supported by a seat, and the cylindrical chute is provided with a coke receiving opening on its top surface in line with the trajectory of the coke falling from the large bell, and its tip is opened to serve as a coke discharge opening, while the top surface of the cylindrical chute is A chute upper lid is provided that can cover and slide in the longitudinal direction, and the chute upper lid is integrally provided with an opening and a tip gate corresponding to the coke receiving opening and the coke discharge opening of the cylindrical chute, and A rod connected to the outside via a pin is taken out of the furnace through a sealing mechanism provided at the outer end of the cylindrical chute, and the chute upper cover is moved in the radial direction of the furnace to the outer end of the rod. A telescopic drive device is connected to the cylindrical chute, and the coke is stored in the cylindrical chute when it falls from the bell, on either the upper surface or the lower surface, or on both the upper and lower surfaces of the chute inside the furnace near the support part of the cylindrical chute. A coke core charging device for a bell-type blast furnace, characterized in that a strain gauge is attached to detect the amount of change in coke during core charging from a cylindrical chute. [Claim 2] A pipe in which a cylindrical chute is provided on the top shell of a bell-type blast furnace below the large bell and slopes downward from outside the top shell to the inside of the furnace and reaches the furnace core in the furnace interior space. A coke receiving port is provided on the upper surface of the outer periphery of the cylindrical chute at a position where the coke falls from the large bell, and a coke discharge port is provided on the upper surface of the closed tip, and a coke discharge port is provided on the upper surface of the closed tip, and is supported by a bearing, and a rotary drive device is provided for inverting the cylindrical chute around its axis, and either the upper surface or the lower surface of the chute inside the furnace near the support part of the cylindrical chute by the tube seat, or Coke in a bell type blast furnace according to claim 1, wherein strain gauges are attached on both upper and lower surfaces to detect the amount of coke received into the cylindrical chute when falling from the bell and the amount of change in coke when charging the furnace core from the cylindrical chute. Furnace core charging device.