Tuyere opening device

Abstract

To provide an opening device for a tuyere capable of safely and quickly removing a blocking material when performing tuyere opening in preparation for re-operation after a wind break.SOLUTION: An opening device for a tuyere for opening a blocked tuyere includes: a truck having an upper plate, a lower plate, a mechanism provided between the upper plate and the lower plate and configured to allow the upper plate to rise and fall vertically, a rail provided on the upper plate, a pedestal provided on the rail and capable of advancing and retreating horizontally along the rail; and a striking device provided on the pedestal of the truck and having a striking part for opening the blocked tuyere. The opening device is configured to position a striking part of a striking device both horizontally and vertically with respect to a tuyere.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a tuyere opening device for opening blocked tuyere. [Background technology]

[0002] During maintenance of a blast furnace, the blowing of air from the tuyere into the blast furnace is stopped to put it into a quiescent state. At this time, if air flows into the blast furnace from the tuyere, reactions occur in the furnace, such as the combustion of coke remaining in the blast furnace and the generation of iron slag. To suppress this, the tuyere is filled with clay or plastic refractories to block it. At that time, before the furnace heat is restored, the filled blocking material opens partially due to natural opening or cracking, and if even a small amount of air is blown from the open part, molten pig iron and slag will be generated in front of the tuyere. However, since there is no flow path for the generated molten pig iron and slag, it will remain near the front of the tuyere, inducing melting damage to the tuyere. For this reason, the blocking material tends to be filled firmly and thickly.

[0003] The work of penetrating the plugging material filled in the tuyere is generally performed by inserting a steel bar or the like through the opening of the blower branch pipe, and the worker pierces the plugging material with the steel bar or the like. Since high-temperature hot air blows back from the opening during the work, the work is performed by reducing the pressure inside the furnace to a level that ensures safety. Alternatively, if the work is difficult even under reduced pressure, the air is stopped and the plugging material filled in the tuyere is removed. In the work of penetrating the plugging material filled in the tuyere, if the clogging material and other deposits adhering to the inner surface of the tuyere are not removed, the amount of air blown by each tuyere will vary, and it will be impossible to supply the specified amount of air per tuyere. In that case, the desired heat and air blast energy will not be supplied sufficiently, and there is a risk that the melting damage of the tuyere as described above will occur again.

[0004] Methods proposed for opening blocked tuyere include an operator inserting a steel bar or the like through the opening in the ventilation branch pipe to break through the blocking material, or, as shown in Patent Document 1, using an opening device such as a cart equipped with a rock drill to quickly remove the blocking material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-342508 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, even when the above-mentioned opening device is used, when opening the tuyere during blowing, high-temperature hot air blows out from the opening window, so the work is usually carried out under reduced pressure (usually 0.05 to 0.15 MPa) in consideration of the safety of the workers. In order to remove the plugging material filled so that there is no natural opening, it was necessary to repeatedly thrust the steel bar a considerable number of times. In addition, in order to push off the material that had adhered to a part of the inner surface even after penetration, it was necessary to look inside and accurately thrust the tip of a long steel bar vertically or diagonally against the plugging material so that it hits that position. Therefore, the work was carried out in an environment where high-temperature hot air could be forcefully blown out. In addition, depending on the blast furnace, the space for performing the tuyere opening work is narrow, and the work was carried out under adverse conditions in terms of safety and the working environment. Furthermore, although Patent Document 1 describes a cart used for the tuyere opening work, its specific structure, etc. is not disclosed.

[0007] The object of the present invention is to solve the above-mentioned problems of the conventional technology and to provide a tuyere opening device that can safely and quickly remove clogging material when performing tuyere opening in preparation for resuming operation after a wind shutdown. [Means for solving the problem]

[0008] The tuyere opening device of the present invention has been developed to solve the above-mentioned problems, and is a tuyere opening device for opening a blocked tuyere, comprising an upper plate, a lower plate, a mechanism provided between the upper and lower plates and configured to enable the upper plate to rise and fall vertically, a carriage having a rail provided on the upper plate and a base provided on the rail and capable of moving forward and backward horizontally along the rail, and an impact device provided on the base of the carriage and having an impact part for opening a blocked tuyere, wherein the impact part of the impact device is configured to be positionable both horizontally and vertically relative to the tuyere.

[0009] In addition, in the tuyere opening device of the present invention, (1) The impact part of the impact device is a metal bar; (2) The impact part of the impact device is a metal pipe, and the metal pipe is capable of blowing gas. (3) A windshield plate is provided on an upper plate of the cart, and a hole is formed in the windshield plate through which the impact portion of the impact device can pass. (4) A gripping portion is provided upright on the lower plate of the cart. (5) The mechanism provided between the upper plate and the lower plate is configured in a cross shape having a movable support part, and has an air pump that can raise and lower the upper plate vertically. (6) The base has an operating device that can move the impact device in the vertical direction without moving the cart. (7) The impact portion of the impact device can be further positioned in an oblique direction. are each considered to be a preferred embodiment. Effect of the Invention

[0010] According to the tuyere opening device of the present invention, it is possible to provide a blast furnace blast tuyere opening that can quickly remove clogging materials when performing tuyere opening, shortening the depressurization time at the time of opening and enabling a quick transition to recovery. In addition, it is possible to improve the safety of workers and reduce their workload, and shorten the depressurization time for safety and workload. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a schematic cross-sectional view showing a part of a cross section of a furnace body of a blast furnace. [Diagram 2] FIG. 1 is a schematic diagram for explaining one embodiment of a tuyere opening device according to the present invention. [Diagram 3] FIG. 4 is a schematic diagram for explaining another embodiment of the tuyere opening device according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the embodiments of the present invention will be described in detail. Note that the following embodiments are merely examples of devices and methods for embodying the technical ideas of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical ideas of the present invention can be modified in various ways within the technical scope described in the claims.

[0013] <One example of a blast furnace operation method to which the present invention is applied> FIG. 1 is a schematic cross-sectional view showing a part of the cross section of the furnace body of a blast furnace. As shown in FIG. 1, the blast furnace according to this embodiment has a shaft, a furnace belly, a morning glory, a hearth, and a tuyere. In the embodiment shown in FIG. 1, when the blast furnace is shut down for a long period of time, the height of the surface of the raw material packed bed directly above the tuyere of the blast furnace is reduced below the upper end of the morning glory of the blast furnace to shut down the blast furnace. After that, in order to blow hot air from the tuyere and return the blast furnace to normal operation, first, a burner is inserted from the tap hole, and oxygen-containing gas or oxygen-containing gas and combustible gas are blown from the burner, and the coke remaining in the furnace is burned to reduce the volume of the residue in the furnace. Next, the tuyere that was blocked during the shut down is pierced by a tuyere opening device, and then the furnace is returned to normal operation.

[0014] <One example of a tuyere opening device according to the present invention> The present invention relates to a tuyere opening device that enables the opening work of penetrating the tuyere plugging material to be performed while ensuring the safety and workload of workers, in order to quickly restore a blast furnace from a maintenance state in which the blowing of air into the blast furnace from the tuyere has been stopped. In the tuyere opening work using this tuyere opening device, a plurality of workers perform the work of penetrating the tuyere plugging material in front of the tuyere of the blast furnace under maintenance.

[0015] Fig. 2 is a schematic diagram for explaining one embodiment of the tuyere opening device according to the present invention. In the embodiment shown in Fig. 2, the tuyere opening device 1 is composed of an upper plate 2, a lower plate 3, a mechanism 4 provided between the upper plate 2 and the lower plate 3 and configured to enable the upper plate 2 to rise and fall vertically, a carriage 21 having a rail 5 provided on the upper plate 2 and a pedestal 6 provided on the rail 5 and capable of moving forward and backward horizontally along the rail 5, and an impact device 31 provided on the pedestal 6 of the carriage 21 and having an impact part 32 for opening a blocked tuyere. The tuyere opening device 1 of the present invention configured as described above is capable of positioning the impact part 32 of the impact device 31 both horizontally and vertically relative to the tuyere.

[0016] In this embodiment, the cart 21 further includes a windshield 7 with a hole 8 in the center, which is erected at the front end of the upper plate 2, and a handle 9 which is erected at the rear end of the lower plate 3 and which is gripped by a user's hand. The cart 21 further includes wheels 11 having stoppers 10 on the underside of the lower plate 3. The mechanism 4 between the upper plate 2 and the lower plate 3 is configured as a cross having a movable support part 12, and the upper plate 2 can be raised and lowered vertically by the operation of an air pressure pump (not shown).

[0017] In this embodiment, the impact device 31 is, for example, a rock drill. The impact device 31 is used while being placed on the base 6 of the cart 21. The impact device 31 is configured so that an impact part 32 made of a metal rod or metal pipe that opens the tuyere that closes the opening can be attached to it. Specifically, the impact device 31 has an impact part 32 made of a metal rod or metal pipe at its tip, is placed on the base 6, and the impact part 32 made of a metal rod or metal pipe is arranged to pass through the hole 8 of the cart 21 for opening the tuyere.

[0018] Furthermore, when the impact device 31 has an impact part 32 at its tip which is a metal pipe, it may be configured to be able to blow gas through the metal pipe against the opening of the tuyere as the plugging material penetrates through. In this case, gas is introduced from the side of the impact device 31, and the opening work can be performed while blowing the gas from the tip of the metal pipe. This allows the pressure of the gas to blow away any residue of the plugging material (clay) that is generated during the opening work. In addition, when the tuyere is opened, it is also possible to remove the plugging material (clay) that has stuck to the side of the opened hole, and compared to removing it manually with a metal rod, this prevents the surface of the side of the hole from being damaged.

[0019] Next, how to use the tuyere opening device according to the present invention will be described. The worker places the impact device 31 (jackhammer) on the base 6 of the dolly 21 for tuyere opening so that the impact part 32 made of a metal rod or metal pipe passes through the hole 8, and operates the mechanism 4 to move the upper plate 2 of the dolly 21 vertically to determine the position. The worker holds the grip part 9 of the dolly 21 in his hand and moves the opening device 1 equipped with the impact device 31, and engages and fixes the stopper 10 of the wheel 11 in front of the tuyere opening part that is the target of the tuyere opening work. The worker holds the handle of the impact device 31 made of a rock drill placed on the dolly 21, and moves the impact device 31 horizontally via the wheels 11 and rails 5 of the base 6, and thrusts the impact part 32 made of a metal rod or metal pipe into the opening part through the hole 8 to perform the opening work. At this time, hot air may blow out of the open hole 8, but since a distance from the opening can be maintained compared to when the work is carried out without using the tuyere opening device 1 of the present invention, and since the tuyere opening device 1 of the present invention is equipped with a windshield 7, work can be continued safely.

[0020] The tuyere opening device 1 of the present invention has the structure described above, and thus allows the target position of the impact device 31 to be flexibly determined in both the horizontal and vertical directions, making it possible to perform tuyere opening work efficiently. Furthermore, if a rock drill is operated directly by hand without using the tuyere opening device 1 of the present invention, the force is dispersed because the rock drill is very heavy. By using the tuyere opening device 1 of the present invention, the force can be efficiently transmitted to the opening, improving work efficiency.

[0021] According to the tuyere opening device of the present invention, when performing tuyere opening work, the clogging material can be quickly removed, the decompression time during opening can be shortened, and a shift to recovery can be made quickly. In addition, the safety of workers can be improved and the workload can be reduced, and the decompression time for safety and workload can be shortened.

[0022] FIG. 3 is a schematic diagram for explaining another embodiment of the tuyere opening device according to the present invention. In the example shown in FIG. 3, the same members as those in the example shown in FIG. 2 are given the same reference numerals as those in FIG. 2, and their explanations are omitted. In the example shown in FIG. 3, the difference from the example shown in FIG. 2 is the configuration of the base 6 on the carriage 21. That is, in the example shown in FIG. 3, the base 6 is composed of a base upper plate 41, a base lower plate 42, and an operating device 43 that connects the base upper plate 41 and the base lower plate 42. The operating device 43 is composed of a first support member 44 that supports the base upper plate 41, a second support member 45 that supports the base lower plate 42, and a connecting portion 46 that rotatably connects the first support member 44 and the second support member 45.

[0023] In the embodiment shown in Fig. 3, the pedestal 6 has the above-mentioned configuration, so that the pedestal upper plate 41 can rotate about the connection part 46 of the operating device 43, and thus the striking part 32 of the striking device 31 can be moved up and down relative to the tuyere by the pedestal 6 alone, without moving the carriage 21. As a result, the striking part 32 of the striking device 31 can be positioned further in an oblique direction, and the striking part 32 can be moved along the taper angle of the tuyere, so that the striking part 32 can be driven more accurately relative to the tuyere. Note that the maximum angle of the striking part 32 in the oblique direction is preferably set to the taper angle of the tuyere. EXAMPLES

[0024] Using the tuyere opening device 1 with the impact device 31 mounted on the carriage 21 as shown in Fig. 2, tuyere opening work was carried out at the end of maintenance on a blast furnace in a steelworks under maintenance. By using the tuyere opening device of the present invention, no one was injured during the opening work, and the work was completed safely. In addition, the opening work period, which previously took 20 days, could be shortened to 10 days, and good results were obtained. [Industrial Applicability]

[0025] INDUSTRIAL APPLICABILITY The tuyere opening device according to the present invention can provide a stable operation method not only for restarting blast furnaces, but also for various vertical melting furnaces other than blast furnaces. [Explanation of symbols]

[0026] 1 Opening device 2 Top plate 3 Lower plate 4 mechanism 5 Rail 6 Pedestal 7 Windbreak plate 8 holes 9 Gripping part 10 Stopper 11 wheels 12 Movable support part 21 Trolley 31 Percussion Device 32 Striking section 41 Pedestal top plate 42 Base bottom plate 43 Operating Equipment 44 First support member 45 Second support member 46 Connection

Claims

1. A tuyere opening device for opening a blocked tuyere in preparation for restarting operation after a wind shutdown, a cart having an upper plate, a lower plate, a mechanism provided between the upper plate and the lower plate and configured to enable the upper plate to rise and fall in a vertical direction, a rail provided on the upper plate, and a base provided on the rail and capable of moving forward and backward in a horizontal direction along the rail; an impact device provided on a base of the carriage and having an impact part for opening a blocked tuyere, the impact part of the impact device being a metal pipe, and the metal pipe being capable of blowing gas; and wherein the striking portion of the striking device is configured to be positionable both horizontally and vertically relative to the tuyere.

2. 2. The tuyere opening device according to claim 1, further comprising: a windshield plate erected on an upper plate of the carriage; and a hole formed in the windshield plate through which the striking portion of the striking device can pass.

3. The tuyere opening device according to claim 1, further comprising a gripping portion erected on a lower plate of the carriage.

4. 2. The tuyere opening device according to claim 1, wherein the mechanism provided between the upper plate and the lower plate is configured in a cross shape having a movable support part and has an air pump capable of vertically raising and lowering the upper plate.

5. 2. The tuyere opening device according to claim 1, wherein the base has an operating device capable of moving the striking part of the striking device in the up and down direction without moving the carriage.

6. 6. The device for opening tuyere according to claim 5, wherein the striking portion of the striking device is further obliquely positionable.

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