CN111850242A - Riser structure, dip tube and method of using same - Google Patents
Riser structure, dip tube and method of using same Download PDFInfo
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- CN111850242A CN111850242A CN202010735887.4A CN202010735887A CN111850242A CN 111850242 A CN111850242 A CN 111850242A CN 202010735887 A CN202010735887 A CN 202010735887A CN 111850242 A CN111850242 A CN 111850242A
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- riser
- ascending pipe
- pipes
- pipe
- pipe body
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
Abstract
The application relates to the field of steel smelting, in particular to a riser structure, a dip pipe and a using method thereof. The riser structure comprises a riser body and a plurality of circulation pipes. The second end of each circulating pipe extends towards the lower opening end and extends to a position 40-100 mm away from the lower opening end. After the inert gas with lower temperature is introduced into the plurality of circulating pipes, the inert gas can flow towards the lower end of the plurality of circulating pipes, so that an air curtain is prevented from being formed in the ascending pipe body, and the flame cannot be blocked from flowing towards the lower end. And the downward inert gas can generate negative pressure in the ascending pipe structure, so that the flame is driven to flow towards the lower end. And because the inert gas flows towards the direction of the lower opening end, the cooling effect on the ascending pipe body is not caused, and the baking effect of the ascending pipe structure is not reduced.
Description
Technical Field
The application relates to the field of steel smelting, in particular to a riser structure, a dip pipe and a using method thereof.
Background
In the steel smelting process, the RH vacuum degassing device can refine molten steel. The RH vacuum degassing apparatus generally comprises a vacuum tank and a dip tube. The dipping pipe is connected below the vacuum tank.
The dip pipe is divided into an ascending pipe and a descending pipe, and a circulating gas pipe is connected to the pipe wall of the ascending pipe and is used for introducing gas, usually argon, into the molten steel in the RH vacuum degassing stage of the molten steel.
In the process of smelting the molten steel, the molten steel enters a vacuum chamber from an ascending pipe for smelting, in the process of smelting, gas is introduced from the ascending pipe, and after smelting is finished, the molten steel returns to a ladle from a descending pipe.
The ascending pipe and the descending pipe are made of refractory materials, and both the ascending pipe and the descending pipe need to be dried before the ascending pipe and the descending pipe are contacted with molten steel for the first time, so that the ascending pipe and the descending pipe can reach a certain temperature, the method is suitable for subsequent molten steel treatment, and the phenomena that the ascending pipe and the descending pipe crack in the subsequent molten steel smelting process and the like are avoided.
Currently, the baking of the ascending pipe and the descending pipe is performed by inserting a preheating gun from the upper part of a vacuum tank, introducing coke oven gas and air (oxygen) into the preheating gun for combustion, and baking with the flame from top to bottom.
However, in this baking method, the baking temperature is the lowest at the end of the rising pipe because the baking is performed with the flame going up and down. And a circulating pipe for introducing gases such as argon is arranged in the wall body of the ascending pipe (along the height direction of the ascending pipe, the circulating pipe is usually arranged at the middle position of the ascending pipe), and inert gases such as nitrogen are required to be introduced into the circulating pipe in the baking process (the inert gases such as nitrogen are introduced to avoid the blockage of the circulating pipe in the baking process). After inert gas (normal temperature) such as nitrogen is introduced into the riser, the baking effect of the riser is poorer than that of the downcomer. Riser temperature measurement at the end of baking: 742 ℃, downcomer temperature measurement: 850 ℃ and the difference between the two is large.
The riser pipe with the lower baking finish temperature can cause the refractory material of the riser pipe to be heated and peeled off when the riser pipe is contacted with molten steel for the first time, and even cause the riser pipe to be burnt through when the riser pipe is serious.
Disclosure of Invention
The embodiment of the application aims to provide a riser structure, a dip pipe and a using method thereof, which aim to solve the problems that the baking of the existing riser is poor due to too low temperature after the baking, the refractory of the riser is peeled off by heat when the riser is contacted with molten steel for the first time, and even the riser is burnt through in serious cases.
In a first aspect, the present application provides a riser structure comprising:
the ascending pipe body is provided with a lower opening end;
a plurality of circulation tubes, each circulation tube having a first end and an opposite second end;
the first end is connected on the inner wall of tedge body to communicate in the tedge body outside, the second end is the free end, and the second end extends to the lower port end direction, and extends to the position department of keeping away from lower port end 40 ~ 100 mm.
This riser structure is through setting up a plurality of circulating pipes in this body of tedge to with the second end to the lower extreme end direction extension, and the second end extend to and hold the position department of distance 40 ~ 100mm with the lower extreme, after the inert gas of letting in the lower temperature in to a plurality of circulating pipes, inert gas can flow to the lower extreme end direction along a plurality of circulating pipes, avoids forming the air curtain in this internal formation of tedge, consequently can not block flame and hold the direction flow of lower extreme end. And the downward inert gas can generate negative pressure in the ascending pipe structure, so that the flame is driven to flow towards the lower end. And because the inert gas flows towards the direction of the lower opening end, the cooling effect on the ascending pipe body is not caused, and the baking effect of the ascending pipe structure is not reduced.
In other embodiments of the present application, the second end extends to a position 45-80 mm away from the lower opening end.
The second end extends to a position 45-80 mm away from the lower opening end, so that the baking temperature of the ascending pipe structure, particularly the baking temperature of the lower opening end of the ascending pipe, can be effectively improved.
In other embodiments of the present application, the second end extends to a distance of 47-55 mm from the lower opening end.
In other embodiments of the present application, the circulation pipes include at least one group; at least one group of circulation pipes is arranged around the circumference of the ascending pipe body.
By surrounding at least one group of circulating pipes into a circle along the circumferential direction of the ascending pipe body, subsequent gas can enter the ascending pipe body from the periphery of the ascending pipe body, and the gas in the ascending pipe body is relatively more uniform.
In other embodiments of the present application, the circulating pipes include a plurality of sets, each set of circulating pipes is surrounded by a circle along the circumferential direction of the riser body; and a plurality of groups of circulating pipes are connected with different heights of the ascending pipe body.
Through setting up the multiunit circulating pipe, and the different height of multiunit circulating pipe connection at the tedge body can follow this internal gas that lets in of different height tedge for it is relatively more even to enter into this internal gas of tedge.
In other embodiments of the present application, the second end of each of the above-described circulation pipes extends to the same height of the riser body.
By extending the second end of each of the circulation tubes to the same height of the riser body, gas can be flowed out from the same location of the riser body, thereby more easily directing the flame flow in the same direction when the riser structure is baked.
In other embodiments of the present application, the sets of circulating pipes are staggered at different heights of the riser body.
Through setting up multiunit circulating pipe in the different highly crisscross of tedge body, can improve the homogeneity of gas in the tedge body.
In other embodiments of the present application, each of the sets of circulating pipes is uniformly arranged along the circumference of the riser body.
Through evenly setting up each group's circulating pipe along the circumference of tedge body, can improve the homogeneity of gas in the tedge body.
In a second aspect, the present application provides a dip tube comprising the riser structure described above.
The dipping pipe can ensure that the baking effect of the ascending pipe structure is good by arranging the ascending pipe structure.
In a third aspect, the present application provides a method of using a dip tube, comprising:
baking the immersion pipe before the immersion pipe is contacted with molten steel for the first time;
in the baking process, introducing inert gas into the plurality of circulating pipes, wherein the inert gas flows along the plurality of circulating pipes towards the lower end and flows out from the second ends of the plurality of circulating pipes;
after baking is finished, the dip pipe is contacted with the molten steel for the first time, the molten steel enters the ascending pipe body, and the plurality of circulating pipes are blown.
The method can ensure that the ascending pipe structure and the descending pipe have approximately the same baking effect after baking. After baking is finished, the dip pipe is contacted with molten steel for the first time, the molten steel enters the ascending pipe body, and the plurality of circulating pipes are blown, wound and melted. In the subsequent molten steel treatment, the riser structure can be the same as the conventional riser structure in the field, and can be normally used to realize the same effect.
The beneficial effects of the riser structure, the dip pipe and the using method thereof provided by the embodiment of the application comprise that:
this riser structure is through this internal a plurality of circulating pipes that set up of tedge, and connect the first end of each circulating pipe on the inner wall of tedge body, the second end extends to the lower port end direction, and the second end extends to and holds distance 40 ~ 100mm position department with the lower port, like this when toasting riser structure, after the inert gas to the lower temperature lets in a plurality of circulating pipes, inert gas can flow to the lower port end direction along a plurality of circulating pipes, and flow from the second end of a plurality of circulating pipes, can avoid the inert gas direct impact offside riser body inner wall of lower temperature like this effectively, avoid this internal formation air curtain in the tedge. Because the riser structure of the application can not form an air curtain in the riser, the flame can not be blocked from flowing towards the lower end. And because inert gas flows to the direction of the lower port end and flows out from the position 40-100 mm away from the lower port end, negative pressure towards the direction of the lower port end can be generated in the ascending pipe structure, and then flame is driven to flow towards the direction of the lower port end. And because inert gas flows to the end direction of the lower port and flows out from the position 40-100 mm away from the end of the lower port, the inert gas at a lower temperature is prevented from directly impacting the inner wall of the ascending pipe body at the opposite side, so that the ascending pipe body is not cooled, and the baking effect of the ascending pipe structure is not reduced. The dipping pipe can ensure that the baking effect of the ascending pipe structure is good by arranging the ascending pipe structure. After baking, the riser structure and the downcomer can be ensured to have approximately the same baking effect. After baking is finished, the dip pipe is contacted with molten steel for the first time, the molten steel enters the ascending pipe body, and the plurality of circulating pipes are blown, wound and melted. In the subsequent molten steel treatment, the structure of the riser can be the same as that of a conventional riser in the field, and the riser can be normally used to realize the same effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a riser structure according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a dip tube provided in an embodiment of the present application;
FIG. 3 is a schematic structural view of a dip pipe installed on a vacuum tank according to an embodiment of the present application.
Icon: 100-riser configuration; 110-riser body; 111-lower mouth end; 112-inner wall; 120-a circulation pipe; 121-a first end; 122-a second end; 200-dip pipe; 210-a downcomer; 300-vacuum groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is usually understood by those skilled in the art, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The inventor finds that: after the conventional ascending pipe is baked at present, the ascending pipe is baked badly, and the temperature is lower than the descending pipe temperature mainly because: in the baking process, inert gases (normal temperature) such as nitrogen are introduced into the riser, and then an air curtain is formed in the circulating pipe to prevent flame from falling, and meanwhile, because the introduced inert gases are low in temperature, the gases with low temperature can cool refractory materials of the riser, so that the baking effect of the riser is poor compared with that of the downcomer.
Based on this, this application embodiment provides an ascending pipe structure, and it can effectively improve ascending pipe toasting temperature for after toasting, ascending pipe temperature and downcomer temperature are equal basically.
Specifically, referring to fig. 1, the riser structure includes: a riser body 110 and a plurality of circulation tubes 120.
Further, the riser body 110 has a lower mouth end 111. Each of the circulation tubes 120 has a first end 121 and an opposite second end 122.
Further, the first end 121 is connected to the inner wall 112 of the ascending pipe body 110 and is communicated with the outside of the ascending pipe body 110, the second end 122 is a free end, the second end 122 extends towards the lower opening end 111, and the second end 122 extends to a position 40-100 mm away from the lower opening end 111.
According to the riser structure 100, the plurality of circulating pipes 120 are arranged in the riser body 110, the first end 121 of each circulating pipe 120 is connected to the inner wall 112 of the riser body 110, the second end 122 extends towards the lower opening end 111, and the second end 122 extends to the position 40-100 mm away from the lower opening end 111, so that when the riser structure 100 is baked, after inert gas with lower temperature (with the temperature lower than the flame temperature) is introduced into the plurality of circulating pipes, the inert gas can flow towards the lower opening end 111 along the plurality of circulating pipes 120 and flows out from the second ends 122 of the plurality of circulating pipes 120, and therefore the inert gas with lower temperature can be effectively prevented from directly impacting the inner wall 112 of the riser body 110 on the opposite side, and a gas curtain is prevented from being formed in the riser body 110. Since the riser structure 100 of the present application does not form an air curtain in the riser body 110, the flame is not blocked from flowing toward the lower end 111. Moreover, because the inert gas flows towards the direction of the lower port end 111 and flows out from the position of the lower port end 111, which is 40-100 mm away from the lower port end, negative pressure towards the direction of the lower port end 111 can be generated in the ascending pipe structure 100, and then the flame is driven to flow towards the direction of the lower port end 111. And because inert gas flows to the direction of the lower port end 111 and flows out from the position which is 40-100 mm away from the lower port end 111, the inert gas at a lower temperature is prevented from directly impacting the inner wall 112 of the ascending tube body 110 at the opposite side, so that the cooling effect on the ascending tube body 110 is avoided, and the baking effect of the ascending tube structure 100 is not reduced.
Further, the second end 122 extends to a position 40-100 mm away from the lower opening end 111. Within the range of 40-100 mm, good negative pressure effect can be generated in the ascending pipe structure 100. Less than 40mm, the negative pressure effect is poor; greater than 100mm, poor installation, and easily stretch out to the outside of tedge body 110, the effect is relatively poor.
Further, after baking is finished, the riser structure 100 first contacts molten steel, and the molten steel enters the riser body 110 to blow and melt the plurality of circulation pipes 120. In the subsequent molten steel treatment, the riser structure 100 can be the same as the structure of a conventional riser in the field, and can be normally used to realize the same effect. Since the weight of the plurality of circulation pipes 120 is very small (negligible) relative to the weight of the molten steel in the entire furnace, it does not affect the molten steel.
Further, the second end 122 extends to a position 45-80 mm away from the lower opening end 111.
Further optionally, the second end 122 extends to a distance of 47-55 mm from the lower mouth end 111.
Illustratively, the second end 122 extends to a position 46mm, 48mm, 49mm, 50mm from the lower mouth end 111.
Further, the circulation pipes 120 include at least one group. At least one set of circulation pipes 120 is wound in a circle along the circumference of the riser body 110.
By surrounding at least one set of circulation pipes 120 into a circle along the circumference of the ascending pipe body 110, the subsequent gas can enter the ascending pipe body 110 from the periphery of the ascending pipe body 110, so that the gas in the ascending pipe body 110 is relatively more uniform.
Further, the circulation pipes 120 include a plurality of sets, each set of circulation pipes 120 is wound into a circle along the circumferential direction of the riser body 110; and multiple sets of circulation pipes 120 are connected at different heights of the riser body 110.
Through setting up multiunit circulating pipe 120, and multiunit circulating pipe 120 is connected at the different heights of tedge body 110, can let in gas in the tedge body 110 from the height of difference for the gas that enters into in the tedge body 110 is more even relatively.
Further, in some embodiments of the present application, the vertical distance between the connection positions of each two adjacent sets of circulation pipes 120 is in the range of 240-260 mm.
Further, in some embodiments of the present application, the distance between the connection positions of each adjacent two sets of circulation pipes 120 is in the range of 245-258 mm.
Illustratively, the distance between the connection locations of each adjacent two sets of circulation tubes 120 is 250mm, 255mm, or 256 mm.
In the illustrated embodiment, the first set of circulation tubes 120 are connected at a location intermediate the riser body 110. The second set of ring tubes 120 is connected amm below the first set of ring tubes 120.
Further, the number of each set of circulating pipes 120 is 5-6.
Further optionally, the number of the plurality of circulation pipes 120 is 10-12.
In the illustrated embodiment, the circulation pipes 120 include two sets, each set of circulation pipes 120 is formed by surrounding a circle along the circumference of the ascending pipe body 110; and two sets of circulation pipes 120 are connected at different heights of the riser body 110.
In the illustrated embodiment, the first ends 121 of the first set of circulation tubes 120 are connected at a location intermediate the riser body 110 height, and the first set of circulation tubes 120 includes 6 circulation tubes 120. The first ends 121 of the 6 circulation pipes 120 are connected to the middle height of the riser body 110, and the 6 circulation pipes 120 are wound in a circle along the circumference of the riser body 110. The second set of ring tubes 120 also includes 6 ring tubes 120. The second set of ring tubes 120 is disposed below the first set of ring tubes 120 (near the lower open end 111). I.e. each first end 121 of the second set of circulation tubes 120 is connected below each first end 121 of the first set of circulation tubes 120.
Further, the plurality of sets of circulating pipes 120 are vertically staggered from each other at the installation position on the inner wall 112 of the riser body 110.
In the illustrated embodiment, the first set of circulation tubes 120 are connected at a location intermediate the riser body 110; the second set of ring tubes 120 are connected at a position slightly lower than the first set of ring tubes 120 and are staggered with respect to the first set of ring tubes 120. I.e. the second set of circulation tubes 120 is arranged in an empty position with respect to the first set of circulation tubes 120.
Further, the second end 122 of each of the circulation pipes 120 extends to the same height of the riser body 110.
By extending the second end 122 of each of the circulation tubes 120 to the same height of the riser body 110, gas can be allowed to flow out from the same location of the riser body 110, thereby more easily directing the flame flow in the same direction when the riser structure 100 is baked.
Further, each set of circulation pipes 120 is uniformly arranged along the circumference of the ascending pipe body 110.
By uniformly arranging each set of the circulation pipes 120 in the circumferential direction of the rising pipe body 110, uniformity of the gas entering the rising pipe body 110 can be further improved.
In the illustrated embodiment, the 6 circulation tubes 120 in the first set of circulation tubes 120 are evenly distributed around the circumference of the riser body 110. The 6 circulation pipes 120 in the second set of circulation pipes 120 are uniformly distributed in the circumferential direction of the riser body 110, and are inserted between every two adjacent circulation pipes 120 in the first set of circulation pipes 120.
Further, the material of the circulation pipe 120 is stainless steel.
By arranging the circulating pipes 120 to be made of the material, after the baking of the ascending pipe structure 100 is finished, when the ascending pipe structure 100 is contacted with the molten steel for the first time, the molten steel enters the ascending pipe body 110, the circulating pipes 120 are blown, and the molten steel is not influenced.
Further, in some embodiments of the present application, the diameter of the circulation tube 120 is in the range of a-b.
Further optionally, in some embodiments of the present application, the diameter of the circulation pipe 120 is in a range of 3-5 mm.
Illustratively, the pipe diameter of the circulation pipe 120 is 4 mm.
Referring to fig. 2, some embodiments of the present application also provide a dip tube 200 including the riser structure 100 provided by the previous embodiments.
By providing the ascending pipe structure 100, the dip pipe 200 can ensure a good baking effect of the ascending pipe structure 100.
Further, the dip tube 200 also includes a downcomer 210.
In some specific embodiments of the present application, 2 groups of 12 circulation pipes 120 are distributed in the rising pipe, each group of 6 circulation pipes 120 is uniformly distributed, nitrogen is introduced into the circulation pipes 120 during the baking process (the nitrogen is introduced to avoid blockage of the circulation pipes 120 during baking), and the flow rate of each circulation pipe 120 is 3-4 NM3Per, total nitrogen flow rate of 40NM for 12 circulation tubes 1203And h, an air curtain is not formed in the baking process, and the flame can be guided to descend (flow towards the lower opening end 111), so that the good baking effect of the riser structure 100 is ensured.
Further, the baking-finished riser structure 100 measures temperature: 863 ℃; temperature measurement of the downcomer 210: 850 ℃.
It can be seen that the dip pipe 200 according to the embodiment of the present invention can ensure that the riser structure 100 and the downcomer 210 have substantially the same roasting effect. Compared with the prior art, the riser temperature measurement is generally carried out after baking: 742 ℃, downcomer temperature measurement: the dipping pipe 200 provided by the application greatly improves the baking effect of the riser pipe after baking at 850 ℃. Therefore, the problems that the baking of the existing ascending pipe is poor due to the fact that the temperature is too low after the baking is finished, the refractory material of the ascending pipe is heated and peeled off when the ascending pipe is contacted with molten steel for the first time, and even the ascending pipe is burnt through when the refractory material is serious can be effectively solved.
Referring to fig. 3, the dip tube 200 can be installed at the bottom of a vacuum tank 300 for RH vacuum degassing.
Some embodiments of the present application also provide a method of using a dip tube, comprising:
baking the immersion pipe before the immersion pipe is contacted with molten steel for the first time;
in the baking process, introducing inert gas into the plurality of circulating pipes, wherein the inert gas flows along the plurality of circulating pipes towards the lower end and flows out from the second ends of the plurality of circulating pipes;
after baking is finished, the dip pipe is contacted with the molten steel for the first time, the molten steel enters the ascending pipe body, and the plurality of circulating pipes are blown.
The method can ensure that the ascending pipe structure 100 and the descending pipe 210 have approximately the same baking effect after baking. After baking, the dip pipe 200 contacts the molten steel for the first time, and the molten steel enters the riser body 110 to blow, wind and melt the plurality of circulation pipes 120. In the subsequent molten steel treatment, the riser structure 100 can be the same as the structure of a conventional riser in the field, and can be normally used to realize the same effect.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A riser structure, comprising:
the ascending pipe body is provided with a lower opening end;
a plurality of circulation tubes, each of said circulation tubes having a first end and an opposite second end;
the first end is connected on the inner wall of rising pipe body to communicate in rising pipe body outside, the second end is the free end, the second end to the end of the lower port direction extends, and extends to the distance the end of the lower port is 40 ~ 100mm position department.
2. The riser structure of claim 1,
the second end extends to a position 45-80 mm away from the lower opening end.
3. The riser structure of claim 1,
the second end extends to a position 47-55 mm away from the lower opening end.
4. The riser structure of claim 1,
the circulating pipe comprises at least one group; at least one group of the circulation pipes is wound into a circle along the circumferential direction of the ascending pipe body.
5. The riser structure of claim 1,
the circulating pipes comprise a plurality of groups, and each group of circulating pipes surrounds a circle along the circumferential direction of the ascending pipe body; and a plurality of groups of circulating pipes are connected to different heights of the ascending pipe body.
6. The riser structure of claim 5,
and the plurality of groups of circulating pipes are arranged at different heights of the ascending pipe body in a staggered manner.
7. The riser structure of claim 1,
the second end of each of the circulation pipes extends to the same height of the riser body.
8. The riser structure of claim 4,
each group of the circulation pipes are uniformly arranged along the circumferential direction of the ascending pipe body.
9. A dip pipe comprising the riser structure of any one of claims 1 to 8.
10. The method of using the dip tube of claim 9, comprising:
baking the immersion tube before the immersion tube is contacted with molten steel for the first time;
in the baking process, introducing inert gas into the plurality of circulating pipes, wherein the inert gas flows towards the direction of the lower opening end along the plurality of circulating pipes and flows out from the second ends of the plurality of circulating pipes;
after baking is finished, the dip pipe is contacted with molten steel for the first time, the molten steel enters the ascending pipe body, and the plurality of circulating pipes extending into the ascending pipe body are blown and melted.
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| CN202010735887.4A CN111850242B (en) | 2020-07-28 | 2020-07-28 | Use method of dip pipe |
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| CN202010735887.4A CN111850242B (en) | 2020-07-28 | 2020-07-28 | Use method of dip pipe |
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| CN111850242B CN111850242B (en) | 2022-03-11 |
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