Furnace bottom cooling structure for relieving erosion of elephant foot area of blast furnace hearth

Abstract

The utility model relates to a furnace bottom cooling structure for relieving erosion of an elephant foot area of a blast furnace hearth, relates to the technical field of blast furnace cooling, and aims to solve the problem that a direct discharge pipe cooling structure is insufficient in cooling effect, the furnace bottom cooling structure comprises a water supply semi-ring pipe and a water return semi-ring pipe which are arranged in a heat-resistant foundation pier of the furnace bottom of a blast furnace, a plurality of water cooling ring pipes are arranged between the water supply semi-ring pipe and the water return semi-ring pipe, the water cooling ring pipes are sequentially arranged at intervals from the center of the bottom of the blast furnace to the outside, the distance between every two adjacent water cooling ring pipes is sequentially decreased from the center of the bottom of the blast furnace to the outside, and any water cooling ring pipe is communicated with a water supply branch pipe and a water return branch pipe; the water supply branch pipe and the water return branch pipe are symmetrically arranged on the two sides of the water cooling ring pipe, the end, away from the water cooling ring pipe, of the water supply branch pipe communicates with the water supply semi-ring pipe, and the end, away from the water cooling ring pipe, of the water return branch pipe communicates with the water return semi-ring pipe. The device has the effects of facilitating equal-radius uniform cooling of the blast furnace bottom and realizing uniform erosion on the circumference of the blast furnace bottom.

Description

Technical Field

[0001] This application relates to the technical field of blast furnace cooling, and in particular to a bottom cooling structure for alleviating the erosion of the elephant's foot area of the blast furnace hearth. Background Art

[0002] As the core equipment in iron and steel production, the erosion problem in the hearth area of the blast furnace has always been the focus of attention of metallurgical engineers. The erosion of the blast furnace hearth is mainly divided into two types: elephant's foot erosion and pot bottom erosion. With the continuous progress of the refractory technology at the bottom of the blast furnace, although the erosion rate has been slowed down to a certain extent, under the current high-intensity production conditions, the elephant's foot erosion is still the main type of blast furnace hearth erosion; on the one hand, the elephant's foot erosion structure is not conducive to activating the blast furnace hearth and improving the blast furnace production index, and on the other hand, it continuously intensifies the molten iron circulation, forming a vicious cycle of molten iron circulation and elephant's foot erosion, accelerating the elephant's foot erosion of the hearth.

[0003] In the related technology, the blast furnace bottom cooling generally adopts a straight pipe cooling structure ( Figure 1 ), which realizes the cooling of the blast furnace bottom by means of water inlet on one side and water outlet on the other side; however, when dealing with the complex problem of elephant's foot erosion, its limitations gradually appear. The design of the straight pipe fails to fully consider the complex thermal stress distribution and erosion mode in the blast furnace hearth, resulting in insufficient cooling effect in the elephant's foot area, not only accelerating the process of elephant's foot erosion, but also intensifying the molten iron circulation phenomenon, further promoting the erosion of the blast furnace hearth sidewall, forming local erosion weak points, and shortening the overall life of the blast furnace, so it needs to be improved. Utility Model Content

[0004] In order to solve the problem of insufficient cooling effect of the straight pipe cooling structure, this application provides a bottom cooling structure for alleviating the erosion of the elephant's foot area of the blast furnace hearth.

[0005] The bottom cooling structure for alleviating the erosion of the elephant's foot area of the blast furnace hearth provided by this application adopts the following technical solutions:

[0006] A bottom cooling structure for alleviating the erosion of the elephant's foot area of the blast furnace hearth includes a water supply semi-circular pipe and a return water semi-circular pipe arranged in the heat-resistant base pier at the bottom of the blast furnace. A number of water-cooled circular pipes are arranged between the water supply semi-circular pipe and the return water semi-circular pipe. The number of water-cooled circular pipes are arranged at intervals in sequence from the center of the blast furnace bottom to the outside. The distance between adjacent water-cooled circular pipes decreases in sequence from the center of the blast furnace bottom to the outside. A water supply branch pipe and a return water branch pipe are connected to any one of the water-cooled circular pipes. The water supply branch pipe and the return water branch pipe are symmetrically arranged on both sides of the water-cooled circular pipe. The end of the water supply branch pipe far away from the water-cooled circular pipe is connected to the water supply semi-circular pipe, and the end of the return water branch pipe far away from the water-cooled circular pipe is connected to the return water semi-circular pipe.

[0007] Due to the design of the straight pipe not fully considering the complex thermal stress distribution and erosion pattern in the blast furnace hearth, the cooling effect is insufficient in the elephant's foot area, which not only accelerates the process of elephant's foot erosion, but also intensifies the phenomenon of molten iron circulation, further promoting the erosion of the hearth sidewall, forming local erosion weak points and shortening the overall life of the blast furnace; by adopting the above technical solution, including a water supply semi-circular pipe and a water return semi-circular pipe, several water-cooled circular pipes are installed between the water supply semi-circular pipe and the water return semi-circular pipe; when cooling the blast furnace bottom, the cooling water is first pumped through the water supply system into the water supply semi-circular pipe arranged in the heat-resistant base pier at the blast furnace bottom. As the water flows in the water supply semi-circular pipe, the cooling water is evenly distributed to each water supply branch pipe. These water supply branch pipes introduce the water into the interior of the water-cooled circular pipe and circulate along the inner wall of the circular pipe. The water-cooled circular pipe, as the main cooling unit, is arranged at intervals and with a decreasing interval from the center of the blast furnace bottom to the outside. This layout design cleverly utilizes the characteristics of the temperature gradient distribution in the blast furnace, that is, the temperature is higher closer to the hearth center. By reducing the interval of the outer circular pipes, the cooling pipes can be arranged more densely to improve the cooling efficiency, especially in the area with a higher temperature. In the water-cooled circular pipe, the cooling water absorbs a large amount of heat from the bottom refractory of the furnace and the temperature gradually rises. Subsequently, the heated cooling water is led out through the water return branch pipe and collected in the water return semi-circular pipe to ensure that the cooling water can smoothly return to the cooling system for recycling or subsequent treatment; by setting up water-cooled circular pipes, etc., the straight pipes at the furnace bottom are adjusted to semi-circular pipes, which is beneficial to the uniform cooling of the blast furnace bottom in terms of radius, realizing uniform erosion on the circumference of the blast furnace bottom, canceling the cooling of the local center at the blast furnace bottom, which is beneficial to the formation of artificial pot-bottom erosion, reducing the formation of elephant's foot erosion in the blast furnace. The semi-circular water-cooled pipes in the furnace bottom cooling area gradually reduce the cooling interval from the inside to the outside, increasing the cooling intensity in the elephant's foot area, further slowing down the elephant's foot erosion. Through the above measures, guiding the blast furnace hearth to finally form a pot-bottom erosion structure can reduce the molten iron circulation, slow down the erosion speed of the hearth sidewall, reduce the formation of local erosion weak points, extend the life of the blast furnace, promote the activity of the blast furnace center, and improve the production indexes of the blast furnace.

[0008] Optionally, a seamless steel pipe for jointing is provided at the horizontal joint end of any one of the water-cooled circular pipes.

[0009] By adopting the above technical solution, the seamless steel pipe is installed at the horizontal joint end of the water-cooled circular pipe; through the setting of the seamless steel pipe, the structural strength of the joint part can be effectively enhanced, and the loosening or damage of the joint caused by factors such as high temperature, high pressure or vibration can be reduced, ensuring the stable operation of the water-cooled circular pipe system.

[0010] Optionally, the maximum distance between adjacent water-cooled circular pipes is 320 mm, and the minimum distance between adjacent water-cooled circular pipes is 180 mm.

[0011] By adopting the above technical solution, the maximum distance between adjacent water-cooled ring pipes is 320 mm, and the minimum distance between adjacent water-cooled ring pipes is 180 mm; by selecting the distance, the branch pipe distance is gradually reduced from the center of the furnace bottom outwards, which can optimize the stress distribution, help balance the stress state of the entire furnace bottom cooling system, and extend the service life.

[0012] Optionally, a water supply ball valve for controlling the cooling water volume is provided on each of the water supply branch pipes.

[0013] By adopting the above technical solution, the water supply ball valve is installed on the water supply branch pipe; through the setting of the water supply ball valve, the cooling water volume entering the water-cooled pipes at the furnace bottom can be accurately controlled, which helps to maintain the stability of the furnace bottom temperature and reduce the thermal stress concentration or energy waste caused by improper cooling water volume.

[0014] Optionally, support seats for fixing are provided on both the water supply semi-ring pipe and the return water semi-ring pipe. The support seats are connected to the heat-resistant base pier at the bottom of the blast furnace, and the water supply semi-ring pipe and the return water semi-ring pipe are respectively connected to the corresponding support seats.

[0015] By adopting the above technical solution, the support seats are installed on the heat-resistant base pier at the bottom of the blast furnace, and the water supply semi-ring pipe and the return water semi-ring pipe are fixed on the corresponding support seats; through the setting of the support seats, the support seats provide a firm support for the water supply semi-ring pipe and the return water semi-ring pipe, reducing the displacement or deformation of the pipes caused by their own weight, water flow impact or external factors.

[0016] Optionally, a number of expansion bolts for fixing to the heat-resistant base pier at the bottom of the blast furnace are provided on the support seats.

[0017] By adopting the above technical solution, the support seats are installed on the heat-resistant base pier at the bottom of the blast furnace through expansion bolts; through the setting of the expansion bolts, a strong fastening force can be provided to ensure that the support seats remain firm and do not loosen under the harsh environments such as high temperature and vibration at the bottom of the blast furnace, improving the stability and reliability of the support seat installation.

[0018] Optionally, U-shaped bolts for fixing the water supply semi-ring pipe or the return water semi-ring pipe are further provided on the support seats, and nuts for cooperation are provided at both ends of the U-shaped bolts.

[0019] By adopting the above technical solution, the U-shaped bolts are installed on the support seats, and the water supply semi-ring pipe or the return water semi-ring pipe is fixed by the cooperation of the U-shaped bolts and the nuts; through the setting of the U-shaped bolts and the nuts, a strong clamping force can be generated, thereby firmly fixing the pipes on the support seats, effectively preventing the displacement or loosening of the pipes caused by vibration, temperature change or external force, and at the same time, the U-shaped bolts can adapt to pipes with different diameters and shapes, adjust the length of the bolts and the tightening degree of the nuts, and can flexibly meet the fixing requirements of different pipes.

[0020] Optionally, a gasket for preventing loosening is provided on the U-bolt.

[0021] By adopting the above technical solution, the gasket is installed on the U-bolt. Through the arrangement of the gasket, the contact area between the bolt and the object to be fixed can be significantly increased, which helps to disperse the pressure generated when the bolt is tightened, reduce the damage caused by excessive local pressure, and at the same time increase the friction between the bolt and the pipeline or the support seat, reducing the possibility of the bolt loosening under vibration or external force.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] By means of the arrangement of the water-cooled ring pipe, etc., the bottom water-cooled pipe of the furnace is adjusted from a straight pipe to a semi-circular pipe, which is beneficial to the uniform cooling of the bottom of the blast furnace in terms of radius, realizes the uniform erosion on the circumference of the bottom of the blast furnace, cancels the cooling of the local center of the bottom of the blast furnace, is beneficial to the formation of artificial bottom erosion, reduces the formation of elephant's foot erosion in the blast furnace. The semi-circular water-cooled pipes in the bottom cooling area are arranged from the inside to the outside, and the cooling distance is continuously reduced, improving the cooling intensity of the elephant's foot area, further slowing down the elephant's foot erosion. By the above measures, guiding the bottom of the blast furnace hearth to finally form a pot-bottom-shaped erosion structure can reduce the molten iron circulation, slow down the erosion rate of the hearth side wall, reduce the formation of local erosion weak points, extend the life of the blast furnace, promote the activity of the blast furnace center, and improve the production indexes of the blast furnace;

[0024] By means of the arrangement of the water supply ball valve, the cooling water volume entering the bottom water-cooled pipe can be accurately controlled, which helps to maintain the stability of the bottom temperature of the furnace and reduce the thermal stress concentration or energy waste caused by improper cooling water volume;

[0025] By means of the arrangement of the U-bolt and the nut, a strong clamping force can be generated, so as to firmly fix the pipeline on the support seat, effectively preventing the displacement or loosening of the pipeline caused by vibration, temperature change or external force. At the same time, the U-bolt can adapt to pipelines with different diameters and shapes, and by adjusting the length of the bolt and the tightening degree of the nut, the fixing requirements for different pipelines can be flexibly realized. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the cooling structure of the straight drain pipe at the bottom of the blast furnace in the prior art.

[0027] Figure 2 is a schematic diagram of the structure of a bottom cooling structure for alleviating the erosion of the elephant's foot area of the blast furnace hearth in the embodiment of the present application.

[0028] Figure 3 is Figure 2 the sectional view taken along the line A-A in

[0029] Figure 4It is a schematic diagram in the embodiment of the present application for reflecting the fixation of the water supply and return semi-circular pipes to the support base.

[0030] Figure 5 It is a schematic diagram in the embodiment of the present application for reflecting the connection mode of the horizontal joints of the water-cooled circular pipe.

[0031] Figure 6 It is a schematic diagram of the structure of the water supply ball valve in the embodiment of the present application.

[0032] Explanation of reference numerals: 1. Water supply semi-circular pipe; 2. Return water semi-circular pipe; 3. Heat-resistant base pier at the bottom of the furnace; 4. Water-cooled circular pipe; 5. Water supply branch pipe; 6. Return water branch pipe; 7. Seamless steel pipe; 8. Water supply ball valve; 9. Support base; 91. Expansion bolt; 92. U-shaped bolt; 93. Nut; 94. Gasket. Detailed implementation manners

[0033] The following further elaborates on the present application in conjunction with the attached Figure 2-6 drawings.

[0034] The embodiment of the present application discloses a bottom cooling structure for alleviating the erosion of the elephant foot area of the blast furnace hearth. Referring to Figure 2 and Figure 3 , the bottom cooling structure for alleviating the erosion of the elephant foot area of the blast furnace hearth includes a water supply semi-circular pipe 1 and a return water semi-circular pipe 2. Both the water supply semi-circular pipe 1 and the return water semi-circular pipe 2 are installed in the heat-resistant base pier 3 at the bottom of the blast furnace. In this embodiment, the cooling water of the water supply system is pumped into the water supply semi-circular pipe 1 arranged in the heat-resistant base pier 3 at the bottom of the blast furnace, and the return water semi-circular pipe 2 smoothly returns the cooling water to the cooling system for recycling or subsequent treatment.

[0035] Referring to Figure 2 and Figure 4 , both the water supply semi-circular pipe 1 and the return water semi-circular pipe 2 are provided with support bases 9. The support bases 9 are connected to the heat-resistant base pier 3 at the bottom of the blast furnace. A number of expansion bolts 91 for fixation are installed on the support bases 9. The expansion bolts 91 can provide a strong fastening force, ensuring that the support bases 9 remain stable and do not loosen under the harsh environments such as high temperature and vibration at the bottom of the blast furnace, improving the stability and reliability of the installation of the support bases 9.

[0036] Referring to Figure 2 and Figure 4, a U-shaped bolt 92 is installed on the support base 9. Nuts 93 are installed at both ends of the U-shaped bolt 92. A fixing area for the water supply semi-circular pipe 1 or the return water semi-circular pipe 2 is formed between the U-shaped bolt 92 and the support base 9. The U-shaped bolt 92 is installed on the support base 9. By cooperating the U-shaped bolt 92 with the nut 93, the water supply semi-circular pipe 1 or the return water semi-circular pipe 2 is fixed, and the pipeline is firmly fixed on the support base 9, effectively preventing the displacement or loosening of the pipeline caused by vibration, temperature change or external force. At the same time, the U-shaped bolt 92 can adapt to pipelines with different diameters and shapes. By adjusting the length of the bolt and the tightening degree of the nut 93, the fixing requirements for different pipelines can be flexibly achieved.

[0037] Refer to Figure 2 and Figure 4 , a gasket 94 is installed on the U-shaped bolt 92. The number of gaskets 94 is the same as the number of nuts 93, which can significantly increase the contact area between the bolt and the object to be fixed, help disperse the pressure generated when the bolt is tightened, reduce the damage caused by excessive local pressure, and at the same time increase the friction between the bolt and the pipeline or the support base 9, reducing the possibility of the bolt loosening under vibration or external force.

[0038] Refer to Figure 2 , a number of water-cooled circular pipes 4 are installed between the water supply semi-circular pipe 1 and the return water semi-circular pipe 2. The number of water-cooled circular pipes 4 is arranged at intervals in sequence from the center of the blast furnace hearth outwards. The distance between adjacent water-cooled circular pipes 4 decreases in sequence from the center of the blast furnace hearth outwards. The maximum distance between adjacent water-cooled circular pipes 4 is 320 mm, and the minimum distance between adjacent water-cooled circular pipes 4 is 180 mm. In this embodiment, the water cooling at the center of the hearth is cancelled, and no water-cooled circular pipe 4 is provided within the range of 1 / 6 of the radius of the center hearth; when the blast furnace volume ≤ 1300 m³, the water-cooled circular pipe 4 can be selected with a specification of Φ76 mm × 12 mm; when the blast furnace volume is between 1300 m³ - 2000 m³, the water-cooled circular pipe 4 can be selected with a specification of Φ89 mm × 14 mm; when the blast furnace volume is greater than 2000 m³, the water-cooled circular pipe 4 can be selected with a specification of Φ108 mm × 14 mm.

[0039] Refer to Figure 2 and Figure 5, the bottom water-cooled loop pipe 4 can be made of cold-drawn seamless steel pipes. In the manufacturing process of the bottom water-cooled loop pipe 4 in this embodiment, if the length of a single cold-drawn seamless steel pipe is not sufficient to form a complete loop pipe, then the two ends of two or more cold-drawn seamless steel pipes need to be butt-jointed and welded or other methods are used to form the required loop pipe structure; a seamless steel pipe 7 is installed at the horizontal joint end of each water-cooled loop pipe 4. The seamless steel pipe can adopt a specification with a length of 200 mm and a wall thickness of 6 mm. The seamless steel pipe 7 can effectively enhance the structural strength of the joint part, reduce the loosening or damage of the joint caused by factors such as high temperature, high pressure or vibration, and ensure the stable operation of the water-cooled loop pipe 4 system; when selecting the bottom water-cooled loop pipe 4, in principle, the least number of seams is adopted. If the bottom water-cooled loop pipe 4 is restricted by the length of the seamless steel pipe 7 and there must be seams, the seams need to avoid the corner position of the bottom water-cooled pipe and can be set at the horizontal position to avoid excessive stress on the bottom pier and cause the joint to be stressed and cracked.

[0040] Refer to Figure 2 , a water supply branch pipe 5 and a return water branch pipe 6 are connected to any water-cooled loop pipe 4. The water supply branch pipe 5 and the return water branch pipe 6 are symmetrically installed on the water-cooled loop pipe 4. One end of the water supply branch pipe 5 away from the water-cooled loop pipe 4 is connected to the water supply semi-loop pipe 1, and one end of the return water branch pipe 6 away from the water-cooled loop pipe 4 is connected to the return water semi-loop pipe 2. In this embodiment, several water supply branch pipes 5 are arranged at intervals in sequence along the arc direction of the water supply semi-loop pipe 1, and several return water branch pipes 6 are arranged at intervals in sequence along the arc direction of the return water semi-loop pipe 2. At the same time, the installation of the water supply branch pipe 5 and the return water branch pipe 6 does not interfere with several water-cooled loop pipes 4 and does not affect the normal installation of the water-cooled loop pipes 4.

[0041] Refer to Figure 6 , a water supply ball valve 8 is installed on each water supply branch pipe 5. The water supply ball valve 8 can be a manual valve, which can accurately control the cooling water volume entering the bottom water-cooled pipe, helps to maintain the stability of the bottom temperature, and reduces the thermal stress concentration or energy waste caused by improper cooling water volume.

[0042] The implementation principle of the bottom cooling structure for alleviating the erosion of the elephant's foot area in the blast furnace hearth in the embodiments of this application is as follows: When cooling the blast furnace bottom, the cooling water is first pumped through the water supply system into the water supply semi-circular pipe 1 arranged in the heat-resistant base pier 3 at the blast furnace bottom. As the water flows in the water supply semi-circular pipe 1, these cooling waters are evenly distributed to each water supply branch pipe 5. These water supply branch pipes 5 introduce the water into the internal water-cooled circular pipe 4 and circulate along the inner wall of the circular pipe. The water-cooled circular pipe 4, as the main cooling unit, is arranged at intervals and with a decreasing spacing from the center of the blast furnace bottom outwards. This layout design cleverly utilizes the characteristics of the temperature gradient distribution in the blast furnace, that is, the temperature is higher closer to the hearth center. By reducing the spacing of the outer circular pipes, the cooling pipes can be arranged more densely, improving the cooling efficiency, especially in the areas with higher temperatures. In the water-cooled circular pipe 4, the cooling water absorbs a large amount of heat from the bottom refractory material and the temperature gradually rises. Subsequently, these heated cooling waters are led out through the return water branch pipe 6 and gathered in the return water semi-circular pipe 2 to ensure that the cooling water can smoothly return to the cooling system for recycling or subsequent treatment;

[0043] By setting up the water-cooled circular pipe 4, etc., the straight bottom water-cooled pipes of the blast furnace are adjusted to semi-circular pipes, which is beneficial to the uniform cooling of the blast furnace bottom in the same radius, realizing uniform erosion on the circumference of the blast furnace bottom, canceling the cooling of the local center of the blast furnace bottom, being conducive to the formation of artificial bottom erosion, reducing the formation of elephant's foot erosion in the blast furnace. The semi-circular water-cooled pipes in the bottom cooling area of the blast furnace are arranged from the inside to the outside with a continuously decreasing cooling spacing, improving the cooling intensity of the elephant's foot area and further slowing down the elephant's foot erosion. By the above measures, guiding the blast furnace hearth to finally form a bottom-shaped erosion structure can reduce the molten iron circulation, slow down the erosion speed of the hearth side wall, reduce the formation of local erosion weak points, extend the service life of the blast furnace, promote the activity of the blast furnace center, and improve the production indexes of the blast furnace.

[0044] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A furnace bottom cooling structure for alleviating erosion of the elephant foot area of ​​a blast furnace hearth, comprising a water supply semi-ring pipe (1) and a water return semi-ring pipe (2) arranged in a heat-resistant base (3) of the blast furnace bottom, characterized in that: A plurality of water-cooling ring pipes (4) are arranged between the water supply semi-ring pipe (1) and the water return semi-ring pipe (2). The plurality of water-cooling ring pipes (4) are arranged in sequence from the center of the blast furnace bottom to the outside, and the spacing between adjacent water-cooling ring pipes (4) decreases in sequence from the center of the blast furnace bottom to the outside. Any of the water-cooling ring pipes (4) is connected to a water supply branch pipe (5) and a water return branch pipe (6). The water supply branch pipe (5) and the water return branch pipe (6) are symmetrically arranged on both sides of the water-cooling ring pipe (4). One end of the water supply branch pipe (5) away from the water cooling ring pipe (4) is connected to the water supply semi-ring pipe (1), and one end of the return branch pipe (6) away from the water cooling ring pipe (4) is connected to the water return semi-ring pipe (2).

2. A furnace bottom cooling structure for alleviating erosion of the elephant foot area of ​​a blast furnace hearth according to claim 1, characterized in that: A seamless steel pipe (7) for jointing is provided at the horizontal joint end of any of the water-cooling ring pipes (4).

3. A furnace bottom cooling structure for alleviating erosion of the elephant foot area of ​​a blast furnace hearth according to claim 1, characterized in that: The maximum spacing between adjacent water-cooling ring tubes (4) is 320 mm, and the minimum spacing between adjacent water-cooling ring tubes (4) is 180 mm.

4. A furnace bottom cooling structure for alleviating erosion of the elephant foot area of ​​a blast furnace hearth according to claim 1, characterized in that: Each of the water supply branch pipes (5) is provided with a water supply ball valve (8) for controlling the amount of cooling water.

5. A furnace bottom cooling structure for alleviating erosion of the elephant foot area of ​​a blast furnace according to claim 1, characterized in that: The water supply semi-ring pipe (1) and the water return semi-ring pipe (2) are both provided with a support seat (9) for fixing, the support seat (9) is connected to the heat-resistant base (3) of the blast furnace bottom, and the water supply semi-ring pipe (1) and the water return semi-ring pipe (2) are respectively connected to the corresponding support seat (9).

6. A furnace bottom cooling structure for alleviating erosion of the elephant foot area of ​​a blast furnace hearth according to claim 5, characterized in that: The support seat (9) is provided with a plurality of expansion bolts (91) for fixing to the heat-resistant base pier (3) at the bottom of the blast furnace.

7. A furnace bottom cooling structure for alleviating erosion of the elephant foot area of ​​a blast furnace according to claim 5, characterized in that: The support seat (9) is also provided with a U-shaped bolt (92) for fixing the water supply semi-circular pipe (1) or the water return semi-circular pipe (2), and nuts (93) for matching are provided at both ends of the U-shaped bolt (92).

8. A furnace bottom cooling structure for alleviating erosion of the elephant foot area of ​​a blast furnace according to claim 7, characterized in that: The U-shaped bolt (92) is provided with a gasket (94) for preventing loosening.

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