Iron notch mud bag pouring structure for starting up a furnace
Patent Information
- Application Number
- CN202522097437.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-29
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2035-09-29
AI Technical Summary
有水泥在高温下因水泥相脱水、分解而产生收缩应力，极易形成贯穿性微裂纹，裂纹在出铁期间被铁水与炉渣渗透，导致泥包表层迅速剥落，抗折、抗冲刷强度下降、不足，常出现铁口“渗铁”、“跑大流”等事故，被迫提前休风修补，严重扰乱高炉顺行；且人工混料、搬运、捣打全过程均在炉前高温、粉尘环境下完成，劳动强度大、作业环境恶劣，存在中暑、烫伤及尘肺风险
[0010]This utility model relates to a blast furnace taphole mud-filling structure. It involves setting up a steel plate and a steel pipe, with a through hole in the steel plate. The steel plate is placed upright inside the blast furnace body, and the first end of the steel pipe is inserted into the taphole, while the second end is inserted into the through hole in the steel plate. This allows the steel plate and the furnace wall to enclose a casting cavity. A mold (the steel pipe) is pre-reserved for the taphole extension section, enabling the direct injection of refractory castable into the casting cavity. The casting of the refractory castable forms a mud-filled structure around the taphole. Compared to traditional manual piling and tamping with cement, this invention, through the arrangement of the steel plate and steel pipe, enables the formation of mud bags from refractory castable. Firstly, the pouring operation is time-saving, labor-saving, simple, and fast, forming a mud bag in a single pour, resulting in higher operational efficiency. Secondly, the use of refractory castable, compared to cement, offers higher compressive strength, high-temperature flexural strength, resistance to slag and iron erosion rates, and abrasion resistance after curing. It also reduces the incidence of accidents such as iron seepage and large flow at the taphole, and extends the average service life of the mud bag. Furthermore, the formed mud bag and the taphole extension section have smooth surfaces, free of voids and delamination, resulting in good taphole channel straightness, less wear during subsequent taphole drilling, and a significantly longer maintenance cycle.
Smart Images
Figure CN224768811U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of blast furnace taphole technology, and in particular to a taphole mud-filling casting structure for furnace start-up. Background Technology
[0002] In the blast furnace ironmaking process of the iron and steel metallurgical industry, a layer of "mud bag" (also known as taphole mud sleeve) must be made on the surface of the furnace wall around the taphole area before the blast furnace is started. The purpose of the mud bag on the furnace wall surface is to protect the brick lining of the furnace wall in the taphole area and prevent it from becoming too thin or leaking due to direct erosion by metal. Traditionally, mud bags are generally made by manually piling and tamping them on-site with cement. With cement, shrinkage stress is generated due to the dehydration and decomposition of the cement phase at high temperatures, which easily forms penetrating micro-cracks. During tapping, the cracks are penetrated by molten iron and slag, causing the surface of the mud bag to peel off rapidly. The flexural and erosion resistance is reduced and insufficient, often resulting in accidents such as "iron seepage" and "large flow" at the taphole, forcing premature shutdown for repairs and seriously disrupting the smooth operation of the blast furnace. Moreover, the entire process of manual mixing, handling, and tamping is completed in a high-temperature and dusty environment in front of the furnace, which is labor-intensive and has a harsh working environment, posing risks of heatstroke, burns, and pneumoconiosis. Utility Model Content
[0003] The purpose of this utility model is to provide a casting structure for the taphole clay bag used for furnace start-up.
[0004] The technical solution to achieve the purpose of this utility model is: a blast furnace taphole mud-filling structure for furnace opening, comprising a blast furnace body, a steel plate, and a steel pipe. The blast furnace body has a taphole on its furnace wall. The steel plate is placed upright in the blast furnace body, and both sides of the steel plate are fixedly connected to the inner wall of the blast furnace body. The steel plate and the furnace wall on the side of the blast furnace body with the taphole enclose a casting cavity. A through hole is opened on the steel plate. The steel pipe, the taphole, and the through hole of the steel plate are all coaxially arranged. The outer diameter of the steel pipe, the inner diameter of the taphole, and the inner diameter of the through hole are all the same. The first end of the steel pipe extends into the taphole, and the second end of the steel pipe passes through the casting cavity and extends into the through hole of the steel plate. The casting cavity is filled with a mud-filled structure formed by the solidification of refractory castable.
[0005] Furthermore, the steel plate comprises two halves, each half having a semi-circular notch on its edge. The two halves are joined together on the same plane to form the steel plate, and the semi-circular notches of the two halves are joined to form the through hole. When installing the steel plate and the steel pipe, the steel pipe can be installed into the iron opening first, and then the steel plate can be installed. When installing the steel plate, including the two halves, the operation of installing the halves one by one is easier. In addition, when the semi-circular notches are joined to form the through hole, it is also more convenient for the steel pipe to pass through the through hole.
[0006] Furthermore, a taphole frame is fixedly installed on the outer wall of the blast furnace body, through which the taphole passes. The taphole frame bears the static pressure and mechanical impact of the molten iron during tapping, preventing the molten iron from cracking or falling off due to uneven stress. Simultaneously, cooling water or a cooler is installed inside the taphole frame to reduce the shell temperature. The taphole frame has a through cavity coaxial with the taphole channel. This through cavity defines the shape of the molten iron and forms a flow channel for the molten iron, thus combining load-bearing, positioning, cooling, and rapid replacement functions. It is a key load-bearing and shaping component ensuring the safety, longevity, and smooth operation of the blast furnace taphole.
[0007] Furthermore, the horizontal centerline of the taphole frame is L, and the top height of the steel plate is consistent with the horizontal height of L. Since the taphole is a channel sloping downwards from the outside to the inside, and the horizontal centerline of the taphole frame is higher than the inner end of the taphole, this structure, on the one hand, ensures the coverage of the mud bag, allowing the steel pipe and the taphole to be completely covered within the mud bag, giving the mud bag a large protective surface for the furnace wall surrounding the taphole; on the other hand, using the horizontal centerline of the taphole frame as the height reference for mud bag casting also facilitates the calculation of the mud bag casting volume, thereby controlling the volume of the mud bag.
[0008] Furthermore, the first end of the steel pipe passes through the ferrule frame and is fixed to it. With this configuration, on the one hand, the ferrule frame typically has a steel mounting plate or reinforcing ribs, and the steel pipe is welded or flanged to these plates or ribs, eliminating the need for additional supports and simplifying assembly. On the other hand, before the ferrule is formed, after the steel pipe passes through the central through-hole of the ferrule frame and is temporarily fixed, the outer wall of the steel pipe can serve as a casting mold for the ferrule, thereby directly defining the inner diameter and straightness of the ferrule channel, facilitating the formation of the ferrule.
[0009] Furthermore, the mud bag is a corundum silicon carbide castable mud bag.
[0010] This utility model relates to a blast furnace taphole mud-filling structure. It involves setting up a steel plate and a steel pipe, with a through hole in the steel plate. The steel plate is placed upright inside the blast furnace body, and the first end of the steel pipe is inserted into the taphole, while the second end is inserted into the through hole in the steel plate. This allows the steel plate and the furnace wall to enclose a casting cavity. A mold (the steel pipe) is pre-reserved for the taphole extension section, enabling the direct injection of refractory castable into the casting cavity. The casting of the refractory castable forms a mud-filled structure around the taphole. Compared to traditional manual piling and tamping with cement, this invention, through the arrangement of the steel plate and steel pipe, enables the formation of mud bags from refractory castable. Firstly, the pouring operation is time-saving, labor-saving, simple, and fast, forming a mud bag in a single pour, resulting in higher operational efficiency. Secondly, the use of refractory castable, compared to cement, offers higher compressive strength, high-temperature flexural strength, resistance to slag and iron erosion rates, and abrasion resistance after curing. It also reduces the incidence of accidents such as iron seepage and large flow at the taphole, and extends the average service life of the mud bag. Furthermore, the formed mud bag and the taphole extension section have smooth surfaces, free of voids and delamination, resulting in good taphole channel straightness, less wear during subsequent taphole drilling, and a significantly longer maintenance cycle. Attached Figure Description
[0011] Figure 1 This is a cross-sectional structural schematic diagram of the iron taphole mud-filled casting structure for furnace opening of this utility model; Figure 2 This is a top-view perspective structural diagram of the casting structure of the taphole clay bag for furnace opening of this utility model; Figure 3 This is a front view schematic diagram of the steel plate of the iron taphole mud-filled casting structure for furnace opening of this utility model. Detailed Implementation
[0012] The preferred embodiment of the taphole clay lining casting structure for furnace start-up of this utility model will be described in detail below with reference to the accompanying drawings: like Figures 1 to 3As shown, a casting structure for a blast furnace taphole includes a blast furnace body 10, a steel plate 1, and a steel pipe 2. A taphole 101 is provided on the furnace wall of the blast furnace body 10. The steel plate 1 is placed upright inside the blast furnace body 10, and its two sides are fixedly connected to the inner wall of the blast furnace body 10. The steel plate 1 and the furnace wall on the side of the blast furnace body 10 with the taphole 101 enclose a casting cavity 20. A through hole 11 is provided on the steel plate 1. The pipe 2, the iron tap 101, and the through hole 11 of the steel plate 1 are all coaxially arranged. The outer diameter D1 of the steel pipe 2, the inner diameter D2 of the iron tap 101, and the inner diameter D3 of the through hole 11 are all the same. The first end of the steel pipe 2 extends into the iron tap 101, and the second end of the steel pipe 2 passes through the casting cavity 20 and extends into the through hole 11 of the steel plate 1. The casting cavity 20 is filled with a mud bag 30 formed by the solidification of refractory castable.
[0013] This utility model relates to a casting structure for a blast furnace taphole. During fabrication, the first end of a steel pipe 2 is inserted into the taphole 101 and fixed to the furnace wall of the blast furnace body 10. Then, a steel plate 1 is placed upright inside the blast furnace body 10, allowing the second end of the steel pipe 2 to pass through the casting cavity 20 and extend into the through hole 11 of the steel plate 1, where it is fixed. The steel pipe 2 serves as a mold for the extension section of the taphole 101. Both sides of the steel plate 1 are fixedly connected to the inner wall of the blast furnace body 10. The steel plate 1 and the furnace wall on the side of the blast furnace body 10 where the taphole 101 is located enclose the casting cavity 20. The casting cavity 20 is filled with refractory castable. After the refractory castable solidifies, a mud bag 30 is formed. The space inside the steel pipe 2 at the location of the mud bag 30 forms the extension section of the taphole 101. In this way, the inner end 1011 of the steel pipe 2 and the tap 101 is completely covered by the mud bag 30, and the mud bag 30 protects the furnace wall around the tap 101.
[0014] This utility model relates to a casting structure for a blast furnace taphole using a clay bag. After the clay bag 30 is formed, neither the steel plate 1 nor the steel pipe 2 needs to be demolded. Under the high temperature of the blast furnace during operation, the steel plate 1 and the steel pipe 2 will automatically melt into the molten iron.
[0015] This utility model relates to a blast furnace taphole mud-filling casting structure. It involves setting up a steel plate 1 and a steel pipe 2, with a through hole in the steel plate 1. The steel plate 1 is placed upright inside the blast furnace body 10. The first end of the steel pipe 2 is inserted into the taphole 101, and the second end is inserted into the through hole 11 in the steel plate 1. This allows the steel plate 1 and the furnace wall of the blast furnace body 10 to enclose a casting cavity 20. A mold (the steel pipe 2) is pre-reserved for the extension section of the taphole 101, allowing refractory castable to be directly injected into the casting cavity 20. The casting of the refractory castable forms a mud-filled sack 30 around the taphole 101. Compared to traditional manual piling and tamping with cement, this invention, through the arrangement of the steel plate 1 and the steel pipe 2, enables the formation of a mud bag 30 by pouring refractory castable. On one hand, the pouring operation is time-saving, labor-saving, simple, and fast, forming the mud bag in a single pour, resulting in higher operational efficiency. On the other hand, in this pouring method, refractory castable can be used for pouring. Compared to cement, the refractory castable, after curing, has higher compressive strength, high-temperature flexural strength, resistance to slag and iron erosion rate, and abrasion resistance index. It also has a lower rate of accidents such as iron seepage and large flow at the taphole, and a longer average service life of the mud bag. Furthermore, the formed mud bag 30 and the extended section of the taphole 101 have smooth surfaces, free of voids and delamination, with good straightness of the taphole channel, resulting in less wear during subsequent taphole drilling and a significantly longer maintenance cycle.
[0016] In this utility model, the iron taphole mud-filled casting structure for furnace opening preferably includes a steel plate 1 comprising two half-plates 12. Each half-plate 12 has a semi-circular notch 121 on its edge. The two half-plates 12 are joined together on the same plane to form the steel plate 1, and the semi-circular notches 121 of the two half-plates 12 are joined to form a through hole 11. When installing the steel plate 1 and the steel pipe 2, the steel pipe 2 can be installed into the iron taphole 101 first, and then the steel plate 1 can be installed. With the two half-plates 12 included, the operation of installing the half-plates 12 one by one is easier. Furthermore, when the semi-circular notches 121 are joined to form the through hole 11, it is also more convenient for the steel pipe 2 to pass through the through hole 11.
[0017] In this utility model, a casting structure for the taphole mud bag for furnace start-up is preferably provided, in which a taphole frame 102 is fixedly installed on the outer wall of the blast furnace body 10, and the taphole 101 passes through the taphole frame 102. The taphole frame 102 is used to withstand the static pressure and mechanical impact of the taphole mud bag, mud sleeve, and molten iron during tapping, preventing the mud bag from cracking or falling off due to uneven stress; at the same time, cooling water is circulated inside the taphole frame 102 or a cooler is embedded therein to reduce the shell temperature. The taphole frame 102 has a through cavity coaxial with the taphole channel, which defines the shape of the mud bag and forms a channel for molten iron to flow out, thus combining the functions of bearing, positioning, cooling, and quick replacement. It is a key bearing and shaping component to ensure the safety, longevity, and smooth operation of the blast furnace taphole.
[0018] In this utility model, the casting structure for the taphole 30 is preferably designed such that the horizontal centerline of the taphole frame 102 is L, and the top height of the steel plate 1 is consistent with the horizontal height of L. Since the taphole 101 is a channel sloping downwards from the outside to the inside, and the horizontal centerline of the taphole frame 102 is higher than the inner end height of the taphole 101, this structure, on the one hand, ensures the coverage of the clay bag 30, allowing the steel pipe 2 and the inner end of the taphole 101 to be completely enclosed within the clay bag 30, thus providing a large protective surface for the furnace wall surrounding the taphole 101; on the other hand, using the horizontal centerline of the taphole frame 102 as the height reference for casting the clay bag 30 also facilitates the calculation of the casting volume of the clay bag 30, thereby controlling the volume of the clay bag 30.
[0019] In this utility model, the casting structure for the taphole clay bag during furnace opening preferably has the first end of the steel pipe 2 passing through and fixed to the taphole frame 102. With this configuration, firstly, the taphole frame 102 typically has a steel mounting plate or reinforcing rib, and the steel pipe 2 is welded or flanged to this steel mounting plate or reinforcing rib, eliminating the need for additional supports and simplifying assembly. Secondly, before the taphole 101 is formed, after the steel pipe 2 passes through the central through hole of the taphole frame 102 and is temporarily fixed, the outer wall of the steel pipe 2 can serve as the casting mold for the taphole 101, thereby directly defining the inner diameter and straightness of the taphole channel, facilitating the formation of the taphole 101.
[0020] In this utility model, the iron taphole clay bag casting structure for furnace opening preferably has the clay bag 30 being a corundum silicon carbide castable clay bag.
[0021] For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model, and all such deductions or substitutions should be considered to fall within the protection scope of this utility model.
Claims
1. A taphole clay bag pouring structure for opening a furnace, characterized by: The furnace includes a blast furnace body, steel plates, and steel pipes. The blast furnace body has an iron tap on its wall. The steel plates are placed upright inside the blast furnace body, with both sides of the steel plates fixedly connected to the inner wall of the blast furnace body. The steel plates and the furnace wall on the side of the blast furnace body with the iron tap form a casting cavity. A through hole is formed on the steel plate. The steel pipes, the iron tap, and the through hole on the steel plate are all coaxially arranged. The outer diameter of the steel pipe, the inner diameter of the iron tap, and the inner diameter of the through hole are all the same. The first end of the steel pipe extends into the iron tap, and the second end of the steel pipe passes through the casting cavity and extends into the through hole of the steel plate. The casting cavity is filled with a mud bag formed by the solidification of refractory castable.
2. The iron notch clay bag pouring structure for blowtoughing according to claim 1, characterized in that: The steel plate comprises two halves, each half having a semi-circular notch on its edge. The two halves are joined together on the same plane to form the steel plate, and the semi-circular notches of the two halves are joined together to form the through hole.
3. The iron notch clay bag pouring structure for blowtoughing according to claim 1, characterized in that: An iron tap frame is fixedly installed on the outer wall of the blast furnace body, and the iron tap passes through the iron tap frame.
4. The iron notch clay bag pouring structure for blowtoughing according to claim 3, characterized in that: The horizontal centerline of the iron frame is L, and the top height of the steel plate is consistent with the horizontal height of L.
5. The iron notch clay bag pouring structure for blowtoughing according to claim 3, characterized in that: The first end of the steel pipe passes through the iron frame and is fixed to the iron frame.
6. The iron notch clay bag pouring structure for blowtoughing according to claim 1, characterized in that: The mud bag is a corundum silicon carbide castable mud bag.