KR100913158B1 - Method for opening tap hole of blast furnace and device thereof - Google Patents

Abstract

Digging the next exit with the opening during the exit operation through the current exit port to minimize the delay of the exit work by preventing the ejection of the melt in the state of opening the next exit port in advance; Penetrating the depth of the piling hole, blocking the reverse flow of the melt from the next starting outlet, and opening the next starting outlet by feeding back the opening.

Outlet, Bit, Tapping Bar, Pit Wing, Coolant, Nitrogen Gas

Description

METHOD FOR OPENING TAP HOLE OF BLAST FURNACE AND DEVICE THEREOF}

The present invention relates to a device and a method of opening a hole for opening the exit port of the furnace. More specifically, the present invention relates to a blast furnace opening hole opening method and a hole opening machine that can open the exit port more quickly.

In general, in the blast furnace industry, after drilling a plurality of outlets installed in the lower part of the blast furnace, or by opening the steel bar by hammering, and then to produce the molten iron and molten iron.

To this end, an excavation bit is mounted on an opening to penetrate the exit of the blast furnace, and the molten material is discharged by forming an outgoing hole by penetrating through an irregular refractory portion in the center of the exit so that the inner and inner blast furnaces are in the blast furnace. This work is called starting work.

The exit port has a depth (depth) from the blast furnace shell to the internal melt, depending on the size of the blast furnace, but is usually about 3500mm. Usually, blast furnaces with a volume of 3000 m3 or more are provided with 3-4 outlets, one of which is regularly repaired and the other 2-3 are circulated and used, and the departure time is usually 120-180 minutes. Takes.

When the blast furnace is described, when the melt is discharged through the outlet installed in the outlet wall, the outlet is closed with refractory and the hydraulic opening is entered into the next outlet to excavate. In this case, drilling and hammering by a drill bit are applied to the inside of the plastic hardened exit port, and the fired hardened material is hardened and cracks are easily generated by the hammering, causing the internal refractory to crack and fall off.

In the case of furnaces that maintain high production, it is difficult to identify the completion point of melt discharge from the current exit to the next exit, and there are many cases of departure delay. Opening work is carried out with excessive drilling and hammering.

In addition, since the time of completion of the melt discharge at the current exit port is not constant, a difference occurs for more than 1 hour, and thus it is difficult to grasp the opening time of the next exit port due to the operator's experience. In addition, the opening time also takes about 10 to 15 minutes, delaying departure.

In addition, although the tapping bar tries to retreat and open immediately after passing through the outlet, the tapping bar tip is cut and retracted so that the melt is often not discharged to the outside of the furnace.

The opening of the outlet 104 by injecting oxygen through the pipe, but this structure also has a problem in that the oxygen pipe connection time and preparation time takes a lot, and the oxygen opening work also takes time, delaying the opening time. In addition, there is a risk that an operator may be burned in the melt ejected around the exit port.

In the related art, the opening delay time is gradually increased because the opening work is performed at the completion of discharge of the tap opening, and thus, it is not a time condition that can be maintained when an abnormality occurs in the equipment such as a drill or a hammer of the hydraulic opening machine. As a result, there is an increase in the low dose of the bottom of the blast furnace and difficulty in managing the yellowing, and the outgoing work is carried out through the next outlet and the next outlet for controlling the yellowing, causing problems of air pollution due to the dust collection range being exceeded.

Accordingly, the present invention provides a furnace opening device and a method of opening the furnace, which can minimize the delay of the starting work by preventing the ejection of the melt in the state of opening the next opening in advance.

To this end, the opening method includes the steps of digging the next outlet through the opening during the operation through the current outlet, penetrating the depth of the next outlet, blocking the reverse flow of the melt from the next outlet, Feedbacking the openings may include opening the next exit.

Accordingly, the opening of the next starting opening in advance and completion of the starting operation through the current starting opening allows the opening of the next starting opening to be minimized by opening the next starting opening in the shortest time.

The excavation step of the next exit opening can be made at the time 70 ~ 80% of the starting work through the current exit opening is completed.

In addition, the step of blocking the reverse flow of the melt after passing through the next depth is the step of ejecting the cooling water for a predetermined time through the excavation bit at the tip of the tapping bar of the open air, and purging the nitrogen gas for cooling through the bit It may include a step.

On the other hand, in the opening machine comprising a tapping bar entering the exit port to open the exit port, and a bit installed at the tip of the tapping bar to excavate the exit port, the bit is in the form of a cone and the outer end surface of the tip portion A plurality of bit blades are protruded at intervals, and each of the bit blades may have a structure in which a plurality of blades protrude.

The opening may further include a cooling water supply line for supplying and ejecting cooling water to the bit through the tapping bar, and a nitrogen gas supply line for supplying and ejecting nitrogen gas.

In addition, the bit may be in communication with the tapping bar so as to eject the cooling water and nitrogen gas, the side between the tip and the blade wing is in communication with the inside may be formed in the injection hole for ejecting the cooling water and nitrogen gas.

Accordingly, the cooling water and the nitrogen gas are ejected through the injection hole to quench the melt in a state where it penetrates the depth of the outlet so that the reverse flow of the melt can be blocked.

In this way, it is possible to block the backflow of the melt and wait in the state of opening the next starting opening in advance, thereby minimizing the starting delay.

In addition, it is possible to reduce the unreasonable excavation work due to the tightness of time when opening the exit port to prevent the occurrence of cracks in the exit port and extend the life of the exit port.

In addition, by eliminating the cutting phenomenon of the tapping bar can reduce the risk of workload and safety accidents.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

It is noted that the figures are schematic and not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting. And the same structure, element or part that appears in more than one figure the same reference numerals are used in different embodiments to indicate corresponding or similar features.

1 is a schematic diagram of the opening of the tap opening.

According to the above drawings, the opening machine 10 for digging and opening the exit port 110 of the blast furnace 100 has a tapping bar 20 to prevent melt ejection after the penetration of the exit port 110 and to easily refractory excavation within the depth. And a bit 30 fastened to the tip of the tapping bar 20.

The tapping bar 20 according to the present embodiment is a pipe-like structure through which the inside is penetrated, the thickness is further increased to sufficiently endure the high temperature inside the outlet 110, and the outer diameter is also increased. As a result, the gap between the outer circumferential surface of the tapping bar 20 and the inner circumferential surface of the drilled outlet 110 may be narrowed to suppress the ejection of the melt.

In addition, the open air 10 is a cooling water supply line for supplying the cooling water and nitrogen gas for the injection block by the melt quench to the bit 30 is fastened to the tip of the tapping bar 20 through the inside of the tapping bar 20 40 and a nitrogen gas supply line 50.

The cooling water supply line 40 is connected to the open air 10 and the valve 41 is installed on one side to control the supply amount of the cooling water. The nitrogen gas supply line 50 is also connected to the open air 10 and the valve 51 is installed on one side to supply or block the nitrogen gas.

2 and 3 show the bit 30 fastened to the tapping bar 20.

The tip 30 has a tip-shaped cone, and four bit blades 31 are disposed at 90-degree intervals on the conical side of the tip to protrude outward. Here, the side ends of the bit wings 31 form a parallel plane in the same direction as the tapping bar 20. This structure prevents the ejection of the melt while the bit wing 31 side end is in contact with the inner surface of the outlet 110 more wide.

 In addition, a tip 32 of the tip blade 31 is provided with a protruded blade 32 is processed into a conical oval shape. In addition, the bit 30 is in communication with the tapping bar 20 to eject the coolant and nitrogen gas supplied through the tapping bar 20, the side between the tip and the bit wing 31 Injecting holes 33 and 34 communicating with the inside to eject cooling water and nitrogen gas are formed.

Accordingly, the cooling water and the nitrogen gas are ejected through the injection holes 33 and 34 to rapidly cool the melt while penetrating the depth of the outlet 110 to block the reverse flow of the melt.

Hereinafter, referring to FIG. 4, a process of opening the next starting outlet 110 using the opening machine 10 having the above-described structure will be described.

In the opening of the outlet 110 of the furnace 100, it is very important to prevent the departure delay when the outlet 110 is changed. Accordingly, in the present embodiment, the departure delay is prevented by digging the next exit port 110 during the exit process through the current exit port 110.

To this end, first check the departure time through the current exit 110 to determine whether the time required 70 ~ 80% of the total departure time has elapsed.

When the departure time through the current exit port 110 reaches the set required time, the opening machine 10 is turned to the next exit port 110 to start the excavation work of the next exit port. At this time, the nitrogen gas and the coolant of the high pressure are ejected by the required amount through the tip of the bit 30 to excavate the refractory.

Excavation criteria according to the depth of the exit port 110 in this embodiment is shown in Table 1 below. During the excavation process, the supply of cooling water and nitrogen gas is continued.

TABLE 1

Depth 0 to 2500 mm 2500 to 3000mm 3000mm or more Feed force 1 or 2 stage 2-3 stage 1 or 2 stage Drill force 2 stage 2-3 stage 2 stage

On the basis of the above criteria, the excavation work for the next exit port 110 is performed, and the depth of the end portion is carried out while gradually lowering the feed and the drill. (S130)

At the time of complete penetration of the depth, the melt is cooled and solidified to block the reverse flow of the melt and wait for work in this state.

Blocking backflow through the cooling of the melt is accomplished by the following procedure.

First, when the depth passes completely, the valve 41 installed on the cooling water supply line 40 is completely opened to eject the cooling water through the tip of the bit 30. The full opening time of the valve 41 is set to about 5 seconds, the valve 41 is closed after the set time has passed the supply of cooling water is cut off.

The coolant supplied to the bit 30 is ejected to the front and side of the bit 30 through the injection holes 33 and 34 formed in the bit 30. The ejected cooling water comes into contact with the melt and instantly melts. This causes the action of blocking the tip end side of the bit 30 to prevent the ejection of the melt.

Here, the outer diameter of the tapping bar 20 on which the bit 30 is mounted is also enlarged as compared with the conventional one, so that the gap between the tapping bar 20 and the inner surface of the tap opening 110 is narrowed, so that the tap hole is sealed. .

After the maximum supply of the cooling water as described above, the supply of the cooling water is interrupted and the valve 51 installed on the nitrogen gas supply line 50 is opened to supply nitrogen gas to the bit 30 and the open air 10. Release the operation mode and wait.

By continuously supplying nitrogen gas to the tip of the bit 30, it is possible to protect the bit 30 and the tapping bar 20 from the high temperature in the outlet 110 in the standby state.

The nitrogen gas is continuously supplied to the tip of the bit 30, but since the tip of the bit 30 is solidified together with the melt, the nitrogen gas is not introduced into the furnace 100.

As the next outlet 110 is opened in advance to block the ejection of the melt, the outlet 100 is discharged and closed immediately after the discharge port 110 is closed. The opening 110 can be opened. (S150 ~ S170)

That is, when retreating the opening machine 10 upon completion of discharge of the tap opening 110 currently under drawing, the bit 30 in a semi-melt state falls back together with the melt, and the tap opening 110 is opened and the melt is ejected. It can be.

This is possible because the bit 30 is cooled with slightly high pressure nitrogen and then melted out immediately due to the heat in the furnace when the tapping bar 20 is retracted. When the opening is complete, the valve 51 of the nitrogen gas supply line 50 is blocked to block the high pressure nitrogen gas supply for preventing the backflow.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

1 is a schematic configuration diagram showing a furnace opening hole opening machine according to an embodiment of the present invention.

2 is a schematic perspective view showing a tapping bar and a bit of an opening machine according to an embodiment of the present invention.

3 is a cross-sectional view showing a bit of the opening machine according to an embodiment of the present invention.

4 is a flowchart illustrating a process of opening a furnace exit according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: open air 20: tapping bar

30: Bit 31: Bit Wing

32: blade 33,34: injection hole

Claims (6)

Digging the next exit with the opening when the exit work through the current exit is completed 70-80%; Continuously digging the next exit opening with an opening, penetrating the depth of the next exit opening, Placing the open air at the next exit port after the depth passes and blocking the reverse flow of the melt from the next exit port; After the completion of the drawing work through the string opening, returning the opening from the next opening and opening the next opening; Furnace outlet opening method comprising a. delete The method of claim 1, The step of blocking the reverse flow of the melt after passing through the next depth is to eject the cooling water for a predetermined time through the excavation bit at the tip of the tapping bar of the open air, and purging the nitrogen gas for cooling through the bit. Furnace exit opening method including. delete delete delete

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