Method for drilling iron notch in blast furnace

Abstract

The invention provides a blast furnace taphole drilling method, which relates to the technical field of blast furnace taphole drilling, and comprises the following steps: manufacturing a taphole drilling flat by using a used taphole drilling rod of which the length is greater than a set length; when no iron leakage hole exists, an iron notch drilling rod provided with an iron notch drilling bit is used for forming an iron notch hole channel with the first set depth, and drilling is stopped until red stemming particles fly out of the iron notch hole channel; withdrawing the taphole drilling rod provided with the taphole drilling bit; an iron notch drilling flat is replaced, and an iron notch hole channel is drilled through; the problems that in the prior art, during blast furnace taphole drilling operation, a large number of drill bits and drill rods are consumed, the cost is high, and the taphole drilling efficiency is low are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace tapping, and more specifically, relates to a method for tapping a blast furnace. Background Art

[0002] In the actual production of blast furnaces, the common equipment for opening the iron mouth includes hydraulic opening machine, drill rod and drill bit. The three cooperate with each other to open the iron mouth of the blast furnace or perform the operation of opening the iron mouth. In the process of opening the iron mouth, the drill rod equipped with the drill bit is in contact with molten iron or slag iron, resulting in a large amount of wear and tear of the drill bit and the drill rod. At the same time, because the drill bit is threadedly connected to one end of the drill rod, sometimes in the process of returning the drill rod equipped with the drill bit, due to the adhesion of high-temperature slag iron or the blockage of cannon mud particles in the iron mouth channel, it will cause the drill bit and the drill rod to be disengaged and separated. The drill bit remains in the iron mouth channel to block the iron mouth channel, which may cause the iron mouth to burn or even open the iron mouth again.

[0003] In summary, the current use of a drill rod equipped with a drill bit for blast furnace tapping not only consumes a large number of drill bits and drill rods, resulting in high costs, but also has low tapping efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a method for opening an iron hole in a blast furnace in view of the shortcomings of the prior art, so as to solve the problems in the prior art that a large number of drill bits and drill rods are consumed during the operation of opening an iron hole in a blast furnace, the cost is high, and the iron hole opening efficiency is low.

[0005] In order to achieve the above object, the present invention provides a method for opening an iron hole in a blast furnace, comprising:

[0006] Using the used taphole drill rod whose length is longer than the set length to make the taphole drill flat;

[0007] When there is no leak at the iron mouth, the iron mouth opening drill rod equipped with the iron mouth opening drill bit is used to open the iron mouth hole of the first set depth until red taphole mud particles fly out of the iron mouth hole, and then the drilling is stopped;

[0008] withdrawing the taphole drill rod equipped with the taphole drill bit;

[0009] Replace the iron mouth drill and drill through the iron mouth channel.

[0010] Optionally, the end of the iron opening drilled flat comprises a flat cutting edge.

[0011] Optionally, the step of using a used taphole drill rod having a length greater than a set length to produce a taphole drill flat comprises:

[0012] Heating one end of a used tap hole drill rod whose length is greater than a set length;

[0013] Forging one end of a used tap hole drill rod having a length greater than a set length to form the cutting edge;

[0014] The end of the iron opening drill flat with the cutting edge is quenched.

[0015] Optionally, when there is a leak at the iron mouth, a second set depth of the iron mouth channel is opened by using an iron mouth opening drill rod equipped with an iron mouth opening drill bit until iron flowers fly out of the iron mouth channel, then drilling is stopped and the iron mouth opening drill rod equipped with the iron mouth opening drill bit is withdrawn, if the flow rate of molten iron flowing out of the iron mouth channel is less than 1t / min;

[0016] Replace the tap hole drill flattening machine and continue drilling until the drilling speed is less than the set drilling speed, stop drilling, and exit the tap hole drill flattening machine;

[0017] Replace the taphole drill rod equipped with the taphole drill bit, and continue drilling until the drilling speed is less than the set drilling speed, stop drilling, and withdraw the taphole drill rod equipped with the taphole drill bit;

[0018] Replace the taphole drill bit and repeat the above two steps until the taphole channel is drilled through.

[0019] Optionally, the iron mouth drill is replaced and the above two steps are repeated until the iron mouth channel is drilled through. When red taphole mud particles fly out of the iron mouth channel, the iron mouth drill is used to flatten the iron mouth channel and the iron mouth channel is drilled through.

[0020] Optionally, the second set depth is smaller than the first set depth.

[0021] Optionally, when there is a leak at the iron mouth, a second set depth of the iron mouth channel is opened by using an iron mouth opening drill rod equipped with an iron mouth opening drill bit until iron flowers fly out of the iron mouth channel, then drilling is stopped and the iron mouth opening drill rod equipped with the iron mouth opening drill bit is withdrawn, if the flow rate of molten iron flowing out of the iron mouth channel is 3-4t / min;

[0022] Carry out slag and iron discharge;

[0023] Replace the iron opening drill flattening tool to open the iron opening.

[0024] Optionally, when tapping iron from the iron mouth channel after being drilled, if coke is stuck in the iron mouth channel, causing the molten iron flow rate to decrease, the iron mouth opening drill is used to open the iron mouth.

[0025] Optionally, the tap hole drill rod and the tap hole drill flat are both connected to a hydraulic tapping machine when in use.

[0026] The present invention provides a method for opening an iron mouth in a blast furnace, and the beneficial effects of the method are as follows: the method for opening an iron mouth in a blast furnace produces an iron mouth drill flattening for an iron mouth drill rod having a length greater than a set length that has been used, and the iron mouth drill flattening does not need to be connected with a drill bit, and there is no risk of the drill bit falling, and the waste drill rod can be reused, thereby reducing the consumption of the iron mouth drill rod and the iron mouth drill bit, and saving costs; when there is no iron mouth leakage, that is, when the iron mouth is opened under normal circumstances, the iron mouth drill rod equipped with the iron mouth drill bit can be used to open an iron mouth channel of a first set depth, and the drilling is stopped when red taphole mud particles fly out of the iron mouth channel, and the first set depth is the depth from the outside of the furnace wall to the outside of the furnace wall. When drilling into the furnace wall to the drilling depth when the cannon mud is close to the molten iron, red cannon mud particles will fly out of the iron mouth channel, proving that the iron mouth channel has been opened to the edge of the mud bag area, that is, the high-temperature area inside the mud bag. At this time, the iron mouth opening drill rod equipped with the iron mouth opening drill bit is withdrawn, and the manufactured iron mouth opening drill flat is replaced to continue drilling until the iron mouth channel is drilled through. This way of iron mouth opening can avoid a large amount of loss of the iron mouth opening drill bit and the iron mouth opening drill rod due to the erosion of molten iron, and can also avoid the iron mouth opening drill bit and the slag iron adhesion caused by the iron mouth opening drill rod equipped with the iron mouth opening drill bit not being withdrawn from the iron mouth channel in time, thereby improving the efficiency of iron mouth opening.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0029] Figure 1 A flow chart of a method for opening an iron hole in a blast furnace according to an embodiment of the present invention is shown.

[0030] Figure 2 A schematic structural view of an iron hole drill flattening tool produced in a method for opening an iron hole in a blast furnace according to an embodiment of the present invention is shown.

[0031] Figure 3 A schematic structural diagram from another perspective of a taphole drill flattened in a method for tapping a blast furnace according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0033] like Figure 1 As shown, the present invention provides a method for opening an iron hole in a blast furnace, comprising:

[0034] Using the used taphole drill rod whose length is longer than the set length to make the taphole drill flat;

[0035] When there is no leak at the iron mouth, the iron mouth opening drill rod equipped with the iron mouth opening drill bit is used to open the iron mouth hole of the first set depth until red taphole mud particles fly out of the iron mouth hole, and then the drilling is stopped;

[0036] withdrawing the taphole drill rod equipped with the taphole drill bit;

[0037] Replace the taphole drill and drill through the taphole hole.

[0038] Specifically, in order to solve the problem that in the prior art, a large number of drill bits and drill rods are consumed during the iron mouth opening operation of a blast furnace, the cost is high, and the iron mouth opening efficiency is low; the method for opening an iron mouth in a blast furnace provided by the present invention makes an iron mouth opening drill flattened by using an iron mouth opening drill rod whose length is greater than a set length; the iron mouth opening drill flattened does not need to be connected with a drill bit, and there is no risk of the drill bit falling; and the waste drill rod can be reused, thereby reducing the consumption of the iron mouth opening drill rod and the iron mouth opening drill bit, and saving costs; when there is no iron mouth leakage, that is, when the iron mouth opening operation is performed under normal circumstances, the iron mouth opening drill rod equipped with the iron mouth opening drill bit can be used to first open an iron mouth channel of a first set depth, and the iron mouth channel can be stopped when red gun mud particles fly out. Drilling, the first set depth is the drilling depth from the outside of the furnace wall to the inside of the furnace wall when the gun mud is close to the molten iron position. At this time, red gun mud particles will fly out of the iron mouth channel, proving that the iron mouth channel has been opened to the edge of the mud bag area, that is, the high-temperature area inside the mud bag. At this time, the iron mouth opening drill rod equipped with the iron mouth opening drill bit is withdrawn, and then the manufactured iron mouth opening drill flat is replaced to continue drilling until the iron mouth channel is drilled through. This way of iron mouth opening can avoid a large amount of loss of the iron mouth opening drill bit and the iron mouth opening drill rod due to the erosion of molten iron, and can also avoid the iron mouth opening drill bit and the slag iron adhesion caused by the iron mouth opening drill rod equipped with the iron mouth opening drill bit not being withdrawn from the iron mouth channel in time, thereby improving the efficiency of iron mouth opening.

[0039] Optionally, the set length is not less than 200 mm of the length of an unused tap hole drill rod.

[0040] In this embodiment, for the used iron mouth drill rod whose length is greater than the set length, the set length can be determined according to the distance between the end of the current hydraulic opening machine and the baffle of the hydraulic opening machine. The used iron mouth drill rod, such as the iron mouth drill rod whose front end is completely deformed or the thread has failed, can be used as long as its length is sufficient to open a complete iron mouth channel on the current furnace wall and mud bag after being connected to the hydraulic opening machine.

[0041] Optionally, the end of the tapping drill flattened includes a flat cutting edge.

[0042] Specifically, Figure 2 and Figure 3 As shown, one end of the iron mouth drill is made into a flat cutting edge, and the other end of the iron mouth drill does not need to be processed and is directly connected to the hydraulic opening machine; the iron mouth drill is equivalent to the integration of the drill bit and the drill rod, and the cutting edge of the head of the iron mouth drill acts as a drill bit.

[0043] Optionally, making the taphole drill flat by using a taphole drill rod that has been used and has a length greater than a set length includes:

[0044] Heating one end of a used tap hole drill rod whose length is greater than a set length;

[0045] Forging one end of a used tap hole drill rod whose length is greater than a set length to form a cutting edge;

[0046] The end with the cutting edge of the open iron drill is quenched.

[0047] Specifically, in the production process of the iron mouth drill flat, one end is first heated at high temperature to soften, and then the heated to softened part is forged into a flat cutting edge, and then quenched to improve the structural strength near the cutting edge, and finally the iron mouth drill flat is made.

[0048] Optionally, when there is a leak at the iron mouth, a second set depth of the iron mouth channel is opened by using an iron mouth opening drill rod equipped with an iron mouth opening drill bit until iron flowers fly out of the iron mouth channel, then drilling is stopped and the iron mouth opening drill rod equipped with the iron mouth opening drill bit is withdrawn, if the flow rate of molten iron flowing out of the iron mouth channel is less than 1t / min;

[0049] Replace the taphole drill and continue drilling until the drilling speed is less than the set drilling speed, then stop drilling and exit the taphole drill;

[0050] Replace the taphole drill rod equipped with the taphole drill bit, and continue drilling until the drilling speed is less than the set drilling speed, stop drilling, and withdraw the taphole drill rod equipped with the taphole drill bit;

[0051] Replace the taphole drill bit and repeat the above two steps until the taphole hole is drilled through.

[0052] Specifically, when there is a leak at the iron mouth, that is, there is damage at the junction of the mud bag and the furnace wall, slag iron can enter along the damaged part. When the iron mouth opening drill rod equipped with an iron mouth opening drill bit is used to open the iron mouth channel of the second set depth, the second set depth is the depth when the iron mouth channel is drilled through the junction of the furnace wall and the mud bag. Due to the existence of the iron mouth, iron flowers will fly out of the iron mouth channel. At this time, in order to protect the iron mouth opening drill rod equipped with the iron mouth opening drill bit, the iron mouth opening drill rod equipped with the iron mouth opening drill bit is immediately withdrawn. If the molten iron flow rate flowing out of the iron mouth channel is less than 1t / min, it can be determined that the iron mouth is not large. In this embodiment, for 2300m 3 For blast furnaces, the normal taphole flow rate is 4-4.5t / min. Operators can judge based on visual observation and experience that the molten iron flow rate flowing out of the taphole channel is obviously very small, far less than the normal taphole flow rate. In this case, the taphole drill flat is replaced, and the taphole drill flat is used to continue drilling the set distance, and then the taphole drill flat is withdrawn, and then the taphole drill rod equipped with the taphole drill bit is replaced and the drilling is continued until the drilling speed is less than the set drilling speed. At this time, it can be determined that the taphole drill bit is already in the wear stage and it is difficult to continue drilling. In order to avoid the taphole drill bit In order to avoid a large amount of wear and tear on the iron mouth drill rod, drilling is stopped, and the iron mouth drill rod equipped with the iron mouth drill bit is withdrawn, and then the iron mouth drill flat is replaced to drill the set distance. The iron mouth drill rod equipped with the iron mouth drill bit and the iron mouth drill flat are repeatedly replaced until the iron mouth channel is drilled through. This can reduce the usage of the iron mouth drill bit and the iron mouth drill rod and save costs. In this example, the setting of the drilling speed is related to factors such as the quality of the tapping mud and the iron tapping interval. It is the drilling speed near the junction of the mud bag and the furnace wall during normal iron mouth opening, which is generally 100-250mm / min.

[0053] Optionally, the drilling speed is set to 100 mm / min.

[0054] In this embodiment, for the set drilling speed, when the iron mouth drill is flattened or the iron mouth drill rod equipped with the iron mouth drill bit drills a part of the length of the iron mouth channel, due to the increase in temperature and the scouring of slag iron, the iron mouth drill is flattened or the iron mouth drill rod equipped with the iron mouth drill bit will enter the wear stage, and it will be difficult to drill forward at this time, and the drilling speed will be significantly slowed down. At this time, it can be judged that its drilling speed is less than the set drilling speed. The operator can judge this through visual inspection and experience. When it is impossible to drill forward, the drilling speed is 0, and the relevant replacement operation is immediately performed at this time.

[0055] Furthermore, if a tap hole of a second set depth is opened using a tap hole drill rod equipped with a tap hole drill bit, and drilling is stopped until iron flowers fly out of the tap hole, and the tap hole drill bit falls off due to adhesion during the process of withdrawing the tap hole drill rod equipped with the tap hole drill bit, then before replacing the tap hole drill bit and continuing drilling, the tap hole is first burned with oxygen to melt the tap hole drill bit that fell off during tapping, and then the tap hole drill bit is replaced and drilling continues to the set distance.

[0056] Optionally, replace the iron mouth drill and repeat the above two steps until the iron mouth hole is drilled through. When red taphole mud particles fly out of the iron mouth hole, use the iron mouth drill to flatten it and drill through the iron mouth hole.

[0057] Specifically, during the drilling process by alternatingly using the iron mouth opening drill rod equipped with the iron mouth opening drill bit and the iron mouth opening drill flattener, once red gun mud particles fly out of the iron mouth channel, it can be determined that the iron mouth channel is about to be drilled through. At this time, the iron mouth opening drill flattener is used to drill through the iron mouth channel, which can protect the iron mouth opening drill rod equipped with the iron mouth opening drill bit and save the use of the iron mouth opening drill bit and the iron mouth opening drill rod.

[0058] Optionally, the second set depth is smaller than the first set depth.

[0059] Specifically, the second set depth is approximately the drilling depth from the outer wall of the furnace wall to the inner wall of the furnace wall, and the first set depth is approximately the drilling depth from the outer wall of the furnace wall to the inner side of the mud bag.

[0060] Optionally, when there is a leak at the iron mouth, a second set depth of the iron mouth channel is opened by using an iron mouth opening drill rod equipped with an iron mouth opening drill bit until iron flowers fly out of the iron mouth channel, then drilling is stopped and the iron mouth opening drill rod equipped with the iron mouth opening drill bit is withdrawn, if the flow rate of molten iron flowing out of the iron mouth channel is 3-4t / min;

[0061] Carry out slag and iron discharge;

[0062] Replace the iron mouth drill flat and open the iron mouth.

[0063] Specifically, for another situation when there is a leak at the iron mouth, the size of the leak is larger, and the molten iron flow rate flowing out of the iron mouth channel at the second set depth is larger, which is almost the same as the molten iron flow rate flowing out of the iron mouth channel formed by normal iron mouth opening, that is, the molten iron flow rate flowing out of the iron mouth channel is almost equal to the normal iron mouth flow rate. The operator can judge this based on visual observation and experience; at this time, slag iron is discharged mainly, and the iron mouth is opened by using an iron mouth flattening drill in the middle stage of iron tapping. The use of the iron mouth flattening drill can save the use of iron mouth drill bits and iron mouth drill rods.

[0064] In this embodiment, when encountering a leaky iron mouth situation where the molten iron flow rate flowing out of the iron mouth channel is almost equal to the normal iron mouth flow rate, slag iron is discharged first, and the iron mouth drill is replaced in the middle of iron tapping to open the iron mouth.

[0065] Optionally, when tapping iron from the iron mouth hole after drilling, if coke is stuck in the iron mouth hole, which reduces the flow rate of molten iron, a iron mouth drill is used to open the iron mouth.

[0066] Specifically, during the iron tapping process, when coke is stuck in the iron mouth channel, the flow rate of molten iron in the iron mouth channel becomes smaller due to the obstruction of the coke. At this time, an iron mouth drill is used to open the iron mouth to ensure the smooth flow of the iron mouth channel. This can avoid the scrapping of the iron mouth drill rod and unnecessary consumption of the iron mouth drill bit due to the erosion of molten iron.

[0067] Optionally, the tap hole drill rod and the tap hole drill flat are both connected to a hydraulic tapping machine when in use.

[0068] Specifically, the iron mouth drill bit is made of discarded iron mouth drill rods, and its tail structure is not changed. It is connected to a hydraulic opening machine, and is driven by the hydraulic opening machine to perform drilling.

[0069] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for opening a blast furnace tap hole, characterized in that: include: Using the used taphole drill rod whose length is longer than the set length to make the taphole drill flat; When there is no leak at the iron mouth, the iron mouth opening drill rod equipped with the iron mouth opening drill bit is used to open the iron mouth hole of the first set depth until red taphole mud particles fly out of the iron mouth hole, and then the drilling is stopped; withdrawing the taphole drill rod equipped with the taphole drill bit; Replace the iron mouth drill and drill through the iron mouth channel.

2. The method for opening a blast furnace tap hole according to claim 1, characterized in that: The end of the tap hole drilled flat comprises a flat cutting edge.

3. The method for opening a blast furnace tap hole according to claim 2, characterized in that: The method of using a used taphole drill rod having a length greater than a set length to produce a taphole drill flat comprises: Heating one end of a used tap hole drill rod whose length is greater than a set length; Forging one end of a used tap hole drill rod having a length greater than a set length to form the cutting edge; The end of the iron opening drill flat with the cutting edge is quenched.

4. The method for opening a blast furnace tap hole according to claim 1, characterized in that: When there is a leak at the iron mouth, a second set depth of the iron mouth channel is opened by using an iron mouth opening drill rod equipped with an iron mouth opening drill bit until iron flowers fly out of the iron mouth channel, then drilling is stopped and the iron mouth opening drill rod equipped with the iron mouth opening drill bit is withdrawn, if the flow rate of molten iron flowing out of the iron mouth channel is less than 1t / min; Replace the taphole flattening drill and continue drilling until the drilling speed is less than the set drilling speed, stop drilling, and exit the taphole flattening drill; Replace the taphole drill rod equipped with the taphole drill bit, and continue drilling until the drilling speed is less than the set drilling speed, stop drilling, and withdraw the taphole drill rod equipped with the taphole drill bit; Replace the taphole drill bit and repeat the above two steps until the taphole channel is drilled through.

5. The method for opening a blast furnace tap hole according to claim 4, characterized in that: The iron mouth drill is replaced and the above two steps are repeated until the iron mouth channel is drilled through. When red taphole mud particles fly out of the iron mouth channel, the iron mouth drill is used to flatten the iron mouth channel and the iron mouth channel is drilled through.

6. The method for opening a blast furnace tap hole according to claim 4, characterized in that: The second set depth is less than the first set depth.

7. The method for opening a blast furnace tap hole according to claim 4, characterized in that: When there is a leak at the iron mouth, use an iron mouth drill rod equipped with an iron mouth drill bit to open an iron mouth channel of a second set depth until iron flowers fly out of the iron mouth channel, stop drilling, and withdraw the iron mouth drill rod equipped with the iron mouth drill bit, if the flow rate of molten iron flowing out of the iron mouth channel is 3-4t / min; Carry out slag and iron discharge; Replace the iron opening drill flattening tool to open the iron opening.

8. The method for opening a blast furnace tap hole according to claim 1, characterized in that: When the tapping is carried out through the tapping hole, if coke is stuck in the tapping hole, which reduces the flow of molten iron, the tapping hole drill is used to open the tapping hole.

9. The method for opening a blast furnace tap hole according to claim 1, characterized in that: When the iron mouth drill rod and the iron mouth drill flat are used, they are both connected with the hydraulic opening machine.

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