CN213652557U

CN213652557U - Device for eliminating high-amplitude thermal deformation of blast furnace hot blast pipe

Info

Publication number: CN213652557U
Application number: CN202022000138.5U
Authority: CN
Inventors: 刘权; 蔡强; 申明军; 李华
Original assignee: Shanghai Meishan Iron and Steel Co Ltd
Current assignee: Shanghai Meishan Iron and Steel Co Ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-07-09
Anticipated expiration: 2030-09-14

Abstract

The utility model relates to an eliminate device of high amplitude heat altered shape of blast furnace hot blast pipe, include: the device comprises a shell capable of being sleeved on a main pipe of a hot branch pipe and a vertical seat for supporting the shell; the side surface of the shell is provided with an opening from which a branch pipe of the hot air pipe extends; the upright posts are connected with the shell through flexible top beams; the housing includes an upper shell and a lower shell secured together by bolts. The utility model provides an eliminate device of high-amplitude thermal deformation of blast furnace hot-blast pipe utilizes the restricted power of structure to restrict hot-blast person in charge and is heated excessively to encircle and warp, restricts the excessive deformation that hot-blast branch pipe axial expansion thrust applyed and causes on being responsible for before too big, restricts the inhomogeneous axial expansion volume of each section of hot-blast person in charge, has solved the hot-blast pipe effectively and has gone up the thermal deformation problem because of carrying the excessive heat that high temperature coal gas produced.

Description

Device for eliminating high-amplitude thermal deformation of blast furnace hot blast pipe

Technical Field

The utility model relates to a device for eliminating high amplitude thermal deformation of a blast furnace hot blast pipe, belonging to the technical field of blast furnace smelting.

Background

The main iron-making methods include a blast furnace method, a direct reduction method, a smelting reduction method and a plasma method. Among them, blast furnace iron making is an iron making method which is widely applied at present. Each blast furnace is provided with three to four hot blast stoves for storing and supplying high temperature gas. The hot blast stove is connected with the blast furnace through a hot blast pipeline, and the hot blast pipeline is used for conveying and distributing hot blast from the hot blast stove to each tuyere of the blast furnace. The hot air duct mainly comprises: hot air branch pipes, a hot air main pipe, an air mixing chamber and the like. High-temperature coal gas coming out of the hot blast stove firstly flows into the hot blast main pipe through the hot blast branch pipe and then enters the hot blast bustle pipe which is arranged outside the blast furnace body in a circular line through the air mixing chamber or the vertical pipe, and the hot blast bustle pipe distributes the high-temperature coal gas to the blast furnace air supply branch pipe and then enters the blast furnace tuyere.

Under the actual working state of a hot-blast pipe in a certain factory, the temperature difference between the surfaces of the hot-blast main pipe and the hot-blast branch pipe is measured on site and can reach 140 ℃ at most, and the problems of brick falling, burning red pipe wall, air channeling of a corrugated expansion joint, upward arching of the hot-blast main pipe, disengagement of a sliding support and the main pipe, torsion of a spring support and the like occur for many times at three intersections of the hot-blast main pipe in production, so that obvious potential safety hazards. Analysis shows that the root of the deformation is excessive thermal deformation and displacement at the three-fork, and excessive upwarping of the main pipe and excessive forward warping along the axial direction of the branch pipe are caused. Therefore, after the hot-blast pipe has the problems, the hot-blast pipe has to be repaired, and the site implementation conditions of repairing and reforming at the three-branch are poor, so that the technical requirement is high, the implementation is very difficult, the long time is required, and huge economic losses are caused to production enterprises.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: overcomes the defects of the technology and provides a device capable of eliminating high-amplitude thermal deformation of a blast furnace hot blast pipe.

In order to solve the technical problem, the utility model provides a technical scheme is: a device for eliminating high amplitude thermal deformation of a blast furnace hot blast pipe comprises: the device comprises a shell capable of being sleeved on a main pipe of a hot branch pipe and a vertical seat for supporting the shell; the side surface of the shell is provided with an opening from which a branch pipe of the hot air pipe extends; the inner diameter of the opening is consistent with the outer diameter of the branch pipe of the hot air pipe; the vertical seat is connected with the shell through a flexible top beam; the shell comprises an upper shell and a lower shell; the upper shell and the lower shell are fixed by a bolt connecting hoop.

The scheme is further improved in that: the flexible top beam comprises a ribbed plate and a shell plate; the rib plate is connected with the upright; the shell plate is connected with the lower shell.

The scheme is further improved in that: the rigidity of the rib plate can be adjusted.

The scheme is further improved in that: the vertical seat is cylindrical.

The utility model provides an eliminate device of high-amplitude thermal deformation of blast furnace hot-blast pipe utilizes the restricted power of structure to restrict hot-blast person in charge and is heated excessively to encircle and warp, restricts the excessive deformation that hot-blast branch pipe axial expansion thrust applyed and causes on being responsible for before too big, restricts the inhomogeneous axial expansion volume of each section of hot-blast person in charge, has solved the hot-blast pipe effectively and has gone up the thermal deformation problem because of carrying the excessive heat that high temperature coal gas produced.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of the exploded structure of fig. 1.

Fig. 3 is a schematic view of the structure of the use state of fig. 1.

Detailed Description

Examples

The device for eliminating high amplitude thermal deformation of the blast furnace hot blast pipe of the embodiment, as shown in fig. 1 and fig. 2, comprises: a shell body which can be sleeved on the main pipe of the hot branch pipe and a vertical seat 4 for supporting the shell body; the housing comprises an upper shell 5 and a lower shell 6; the upper shell 5 and the lower shell 6 are fixed into a complete shell by a bolt connecting hoop; the side surface of the shell is provided with an opening for accommodating the extension of the branch pipe of the hot air pipe; the inner diameter of the opening is consistent with the outer diameter of the branch pipe of the hot air pipe; the vertical seat is cylindrical, and the top of the vertical seat is connected with the shell through a flexible top beam 3.

The flexible top beam comprises a ribbed plate and a shell plate; wherein the ribbed plate is connected with the vertical seat 4; the shell plate is connected with the lower shell 6. The flexible top beam 3 is used for limiting the vertical displacement of the main pipe of the heat branch pipe and the horizontal displacement along the axial direction of the branch pipe, transmitting the constraint force of the vertical seat 4 to the shell and finally transmitting the constraint force to the main pipe of the heat branch pipe. The vertical seat 4 is used for limiting the horizontal displacement of the main pipe of the hot branch pipe along the axial direction of the branch pipe.

The device for eliminating high-amplitude thermal deformation of the blast furnace hot blast pipe can adjust rigidity, specifically comprises the steps of adjusting the size of the vertical base 1, the size of the flexible top beam 3 and the thickness of the shell, and in order to accurately adjust the supporting rigidity, a secondary rigidity adjusting ribbed plate is arranged on the flexible top beam 3.

The device for eliminating high-amplitude thermal deformation of the blast furnace hot blast pipe of the embodiment is used in a certain blast furnace ironmaking hot blast pipe structure, and as shown in fig. 3, the hot blast pipe comprises a main pipe 7 and branch pipes 8.

The finite element analysis of the thermal engine coupling shows that the refractory structures of the main pipe and the branch pipe are different, the temperature difference of about 50 degrees exists between the surfaces of the metal shell of the main pipe and the metal shell of the branch pipe, and the temperature difference of about 140 degrees exists between the clay brick layer of the main pipe and the clay brick layer of the branch pipe, so that the arching amount at the three-branch position reaches 13 mm; the thermal expansion of the branch pipes generates a forward thrust of over 1000 tons, causing the junction of the main pipe to bow forward 20 mm. And finally determining that the device for eliminating the high-amplitude thermal deformation of the blast furnace hot blast pipe is installed at the main pipe three-branch through multiple finite element analysis and repeated calculation.

In the embodiment, the upper shell 5 and the lower shell 6 are fixedly connected through bolts and then hooped on the main pipe 7; one end of the flexible top beam 3 is connected with the lower shell 6 through a shell plate with the flexible top beam, and the other end of the flexible top beam is connected with the vertical seat 4 and is positioned on an axial extension line of the branch pipe 8; the top of the vertical seat 4 is connected with the flexible top beam 3, is positioned on the axial extension line of the branch pipe 8 and is arranged perpendicular to the ground.

The deformation limiting stop seat is arranged at the three-branch position of the main pipe, the excessive deformation of the hot air main pipe is limited by structural constraint, a good effect is achieved, and the blast furnace ironmaking production is safe and stable in operation.

The phenomena of brick falling and burning of the pipe wall of the hot air pipe are avoided, the positions of the sliding support and the spring support are recovered, the hot air pipe runs stably and safely, and the effect is very obvious. The problems that the three-fork refractory brick cracks, falls off, the pipe wall of the hot blast main pipe is burnt red and the like still occur after the hot blast pipe which is not adopted by the method is used for a period of time, which shows that the method is very effective for eliminating the high-amplitude thermal deformation of the hot blast pipe of the blast furnace.

The present invention is not limited to the above embodiment. All technical solutions formed by equivalent substitutions fall within the protection scope of the present invention.

Claims

1. A device for eliminating high amplitude thermal deformation of a blast furnace hot blast pipe is characterized by comprising: the device comprises a shell capable of being sleeved on a main pipe of a hot branch pipe and a vertical seat for supporting the shell; the side surface of the shell is provided with an opening from which a branch pipe of the hot air pipe extends; the inner diameter of the opening is consistent with the outer diameter of the branch pipe of the hot air pipe; the vertical seat is connected with the shell through a flexible top beam; the shell comprises an upper shell and a lower shell; the upper shell and the lower shell are fixed by a bolt connecting hoop.

2. The device for eliminating high-amplitude thermal deformation of the blast furnace hot blast pipe according to claim 1, is characterized in that: the flexible top beam comprises a ribbed plate and a shell plate; the ribbed plate is connected with the vertical seat; the shell plate is connected with the lower shell.

3. The device for eliminating high-amplitude thermal deformation of the blast furnace hot blast pipe according to claim 2, is characterized in that: the rigidity of the rib plate can be adjusted.

4. The device for eliminating high-amplitude thermal deformation of the blast furnace hot blast pipe according to claim 1, is characterized in that: the vertical seat is cylindrical.