Sectional type iron notch structure

Abstract

The utility model discloses a sectional type iron notch structure, which relates to the technical field of blast furnace operation, and comprises an iron notch hole channel, an iron notch mud sleeve, an iron notch mud sleeve, an iron notch mud sleeve and an iron notch mud sleeve, the aperture of one end, close to the outer side of the furnace wall, of the iron notch duct is not smaller than that of one end, close to the inner side of the furnace wall, of the iron notch duct; by means of the iron notch structure, the flow speed and pressure of molten iron in the iron notch hole channel can be reduced, the scouring erosion effect of the molten iron on stemming in the iron notch hole channel is relieved, the safety risk of workers in front of a furnace can be reduced, the iron notch opening efficiency is improved, the iron notch burning frequency is reduced, the good working state of the iron notch is guaranteed, and the purpose of smoothly discharging slag iron is achieved. And stable and smooth operation of the blast furnace is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the blast furnace front operation technical field, more specifically, it relates to a sectional type iron notch structure. BACKGROUND

[0002] In the actual production process of the blast furnace, the discharge of slag and iron is crucial for the healthy operation of the blast furnace. The iron notch, as the only path for the discharge of slag and iron, ensures its good working state, which is an important factor to ensure the stable and smooth operation of the blast furnace. There are many factors that affect the working state of the iron notch, such as the equipment and facilities for opening the iron notch, the operation method for opening the iron notch, the influence of the furnace condition, the quality of the ramming mass, and the level of the furnace temperature. This article introduces the existing operation method for opening the iron notch from the perspective of the existing operation method for opening the iron notch. The blast furnace hydraulic opening machine, drill rod, and drill bit opening iron notch equipment cooperate to drill the iron notch. In special cases such as iron leakage, difficult iron opening, and iron opening, the drilling of the iron notch and the use of oxygen to burn the iron notch are alternately operated until the iron notch is opened, or even the mud is re-drilled. Burning the iron notch with oxygen and drilling the iron notch for a long time will have adverse factors on the working state of the iron notch, affecting the iron tapping rhythm and the operation of the blast furnace. Due to the long-term impact and vibration of the opening machine drilling the iron notch, the mud bag may develop cracks or even break, which seriously affects the discharge of slag and iron. SUMMARY

[0003] The utility model discloses a sectional type iron notch structure, which can reduce the flow rate and pressure of molten iron in the iron notch channel, reduce the erosion of molten iron on the ramming mass in the iron notch channel, reduce the safety risk of the workers at the blast furnace, improve the efficiency of opening the iron notch, reduce the frequency of burning the iron notch, ensure the good working state of the iron notch, and achieve the purpose of smooth discharge of slag and iron, thereby ensuring the stable and smooth operation of the blast furnace.

[0004] To achieve the above-mentioned purpose, the utility model provides a sectional type iron notch structure, which comprises:

[0005] The iron notch channel is arranged in the iron notch mud sleeve, and the other end of the iron notch channel extends to the inside of the blast furnace through the mud bag.

[0006] The iron notch channel comprises at least two iron notches, and the aperture of the end of the iron notch channel close to the outside of the furnace wall is not less than the aperture of the end close to the inside of the furnace wall.

[0007] Optionally, the end of the iron notch channel close to the outside of the furnace wall is higher than the end close to the inside of the furnace wall, and the multiple iron notches in the iron notch channel are in the same straight line direction.

[0008] Optionally, the aperture of each iron notch is constant.

[0009] Optionally, when the blast furnace is in normal production, the iron notch channel comprises, from outside to inside, a first iron notch, a second iron notch and a third iron notch, and the diameters of the first iron notch, the second iron notch and the third iron notch decrease gradually.

[0010] Optionally, the first iron notch, the second iron notch and the third iron notch are formed by using different types of drill bits respectively.

[0011] Optionally, the second iron notch is arranged at the junction of the clay and the furnace wall, and the distances from the two ends of the second iron notch to the junction of the clay and the furnace wall are the same.

[0012] Optionally, the distances from the two ends of the second iron notch to the junction of the clay and the furnace wall are 300 mm.

[0013] Optionally, when the last iron notch of the blast furnace is a shallow iron notch or the blast furnace is in an under-iron state, the diameters of the first iron notch and the second iron notch are the same.

[0014] Optionally, when the blast furnace is in an iron holding state, the diameters of each iron notch in the iron notch channel are the same.

[0015] The utility model provides a sectional iron notch structure, and its beneficial effects are as follows:

[0016] 1. The iron notch structure can reduce the flow rate of molten iron in the iron notch channel, reduce the erosion of the clay in the iron notch channel by the molten iron, and ensure the good working state of the iron notch.

[0017] 2. The iron notch structure can improve the efficiency of iron notch opening, reduce the use amount of drill pipes, and reduce the frequency of iron notch burning, thereby ensuring the smooth discharge of slag and iron and maintaining the working state of the iron notch.

[0018] 3. The iron notch structure can reduce the pressure of the molten iron in the iron notch channel, reduce the splashing range of the molten iron when the iron notch is opened, and reduce the safety risk of the workers at the blast furnace.

[0019] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and advantages of the utility model will become more apparent from the following detailed description of exemplary embodiments of the utility model, taken in conjunction with the accompanying drawings, in which like reference characters commonly refer to the same or similar elements throughout the drawings. In the drawings:

[0021] Figure 1 Fig. 1 shows a structural schematic diagram of an iron notch structure according to an embodiment of the utility model.

[0022] Reference signs:

[0023] 1, iron notch clay sleeve; 2, the junction of clay and furnace wall; 3, the first section of the iron notch; 4, the second section of the iron notch; 5, the third section of the iron notch; 6, the clay. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present application will be described in more detail below. Although the preferred embodiments of the present application are described below, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application is more complete and complete, and the scope of the present application is fully conveyed to those skilled in the art.

[0025] The present application provides a segmented iron notch structure, which determines the diameter of the opening machine drill bit according to the furnace capacity of the blast furnace. The iron notch is segmented along the iron notch channel, and the diameter of each segment of the iron notch channel is set to be different as much as possible. When the blast furnace is running normally, the radial size of each segment of the iron notch from the outside to the inside can be set in a decreasing trend, and when the hydraulic opening machine opens the iron notch, the drill bit needs to be used in three different sizes in turn, so that after the molten iron flows out of the iron notch, the pressure of the molten iron decreases and the flow rate of the molten iron also slows down with the increase of the hole diameter.

[0026] For example, when the furnace capacity of the blast furnace is 2000m 3 -3000m 3 , the sizes of the large, medium and small drill bits can be selected as 58mm, 55mm and 50mm, and the three different sizes of the iron notch correspond to the first section of the iron notch, the second section of the iron notch and the third section of the iron notch.

[0027] The specific iron opening method of the segmented iron notch structure is as follows:

[0028] During normal production operation of the blast furnace, the iron notch is opened according to the matching of the three-section type and the three sizes of the drill bit;

[0029] During normal production operation of the blast furnace, if the last iron notch is slightly shallow, i.e. shallow iron notch (according to the size of the blast furnace and the actual production, the shallow iron notch is below the lower limit of the normal iron notch depth range), when opening the iron notch this time, it is recommended to use the medium size drill bit when opening the first section of the iron notch and the second section of the iron notch, and if the iron notch is not opened through the first two sections, the small size drill bit is used when opening the third section of the iron notch;

[0030] During normal production operation of the blast furnace, when it belongs to the state of insufficient iron (the actual iron output of the blast furnace is lower than the theoretical iron output), the first section of the iron notch, the second section of the iron notch use the large size drill bit, and the third section of the iron notch uses the medium size drill bit;

[0031] In the normal production operation of the blast furnace, when it is in the abnormal iron holding state (due to individual special reasons, the slag iron of the blast furnace is not discharged or not completely discharged for a long time, i.e. the actual iron discharge amount of the blast furnace is far lower than the theoretical iron discharge amount), in order to timely discharge the slag iron, large drill bits are used to open the iron notch in the whole three-stage iron notch.

[0032] In the iron notch opening method of the sectional iron notch structure, the iron notch opening is not limited to the three-stage iron notch opening, and here the iron notch channel is only theoretically divided into three stages. The position selection of the second-stage iron notch and the operation method of each stage need to be combined with the actual conditions such as the iron discharge system of the blast furnace, the quality of the taphole clay, the depth of the iron notch, and the actual operation of the blast furnace, and reasonable changes are made in time to ensure that the iron notch is in good working condition and the slag iron is timely and smoothly discharged to ensure the stable operation of the blast furnace.

[0033] The principle of the iron notch opening method of the sectional iron notch structure is mainly to change the diameter of each stage of the iron notch channel to reduce the flow rate and pressure of the molten iron in the iron notch channel, reduce the erosion of the molten iron on the taphole clay in the iron notch channel, ensure the good working condition of the iron notch, and reduce or eliminate the impact of slag iron discharge on the operation of the blast furnace. In addition, the range of molten iron splashing when the iron notch is opened is reduced, the safety risk of the workers at the blast furnace is reduced, the opening of the iron notch of the blast furnace is made easy, and under normal circumstances, the rotating drill rod and drill bit will have a reduced rotating speed due to the resistance caused by a small amount of taphole clay particles in the narrow iron notch channel during the opening of the iron notch, which reduces the efficiency of drilling the iron notch. Increasing the diameter of the iron notch channel increases the space of the iron notch channel, reduces or avoids the resistance, and is beneficial to the opening of the iron notch. During the opening of the iron notch, the drill bit and the drill rod are sometimes directly contacted with the high-temperature slag iron or even adhered due to the narrowness of the iron notch channel and the instantaneous outflow of the high-temperature slag iron, which may cause the drill bit to fall off and hinder the discharge of the slag iron, the drill rod to be scrapped, and the opening machine to be unable to exit. At this time, the iron notch needs to be burned to open the iron notch, and burning the iron notch will cause the diameter of the iron notch channel to be irregularly increased on the basis of the original diameter, the working condition of the iron notch to be deteriorated, the iron discharge to be accelerated, and the operation and the rhythm of the iron discharge of the blast furnace to be affected.

[0034] The sectional iron notch structure expands the diameter of the iron notch channel, increases the space of the drill bit and the drill rod in the iron notch channel, reduces the flow rate of the molten iron in the iron notch channel, and can timely withdraw the opening machine, the drill rod and the drill bit at the moment when the iron notch is opened. This not only improves the efficiency of opening the iron notch but also saves the use amount of the drill rod and the drill bit, reduces the frequency of burning the iron notch, ensures the smooth discharge of the slag iron, and maintains the working condition of the iron notch.

[0035] EMBODIMENT

[0036] As shown in Figure 1 The utility model provides an iron notch opening method of sectional iron notch structure, include:

[0037] The large drill bit is installed on the opening machine drill rod, the tap hole is opened in the iron mouth mud sleeve 1, when the large drill bit drills to 300mm distance from the junction of the furnace mud bag and the furnace wall 2, the tap hole opening is stopped, thus the first section of the tap hole 3 is formed, and no high temperature gun mud particles fly out of the tap hole in the process of the section of the tap hole;

[0038] The middle drill bit is replaced and installed on the opening machine drill rod, the tap hole is continuously opened along the direction of the first section of the tap hole 3, when the middle drill bit drills into the mud bag 6 and is 300mm distance from the junction of the mud bag and the furnace wall 2, the tap hole opening is stopped, thus the second section of the tap hole 4 is formed, and no high temperature gun mud particles fly out of the tap hole in the process of the section of the tap hole;

[0039] The small drill bit is replaced and installed on the opening machine drill rod, the tap hole is continuously opened along the direction of the second section of the tap hole 4 until the molten iron flows out, thus the third section of the tap hole 5 is formed.

[0040] The above has described the various embodiments of the utility model, the above description is exemplary, is not exhaustive, and is not limited to the disclosed various embodiments. Many modifications and changes are obvious to those skilled in the art without deviating from the scope and spirit of the described various embodiments.

Claims

1. A segmented taphole structure, characterized in that, The application relates to a taphole hole channel, one end of which is arranged in a taphole clay sleeve, and the other end of the taphole hole channel extends through the clay pack to the inside of a blast furnace. The taphole hole channel comprises at least two tapholes, and the hole diameter of the end of the taphole hole channel close to the outside of the furnace wall is not less than the hole diameter of the end close to the inside of the furnace wall. The end of the taphole hole channel close to the outside of the furnace wall is higher than the end close to the inside of the furnace wall, and the tapholes in the taphole hole channel are in the same linear direction.

2. The segmented taphole structure of claim 1, wherein, The hole diameter of each taphole is constant.

3. The segmented taphole structure of claim 1 wherein, When the blast furnace is in normal production, the taphole hole channel comprises a first taphole, a second taphole and a third taphole from outside to inside, and the hole diameters of the first taphole, the second taphole and the third taphole decrease gradually.

4. The segmented taphole structure of claim 1 wherein, The first taphole, the second taphole and the third taphole are formed by using different drill bits.

5. The segmented taphole structure of claim 4, wherein, The second taphole is arranged at the junction of the clay pack and the furnace wall, and the distances from the two ends of the second taphole to the junction of the clay pack and the furnace wall are the same.

6. The segmented taphole structure of claim 4 wherein, The distances from the ends of the second taphole to the junction of the clay pack and the furnace wall are 300 mm.

7. The segmented taphole structure of claim 6 wherein, When the last tapping of the blast furnace is a shallow taphole or the blast furnace belongs to an under-tapped state, the hole diameters of the first taphole and the second taphole are the same.

8. The segmented taphole structure of claim 4 wherein, When the blast furnace belongs to a taphole-clogged state, the hole diameters of the tapholes in the taphole hole channel are the same.

9. The segmented taphole structure of claim 1 wherein, ​

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