Method for installing a large bustle of a blast furnace

Abstract

This invention discloses a method for installing a blast furnace tuyere sleeve, relating to the field of iron or steel smelting technology, and solving the problems of large lifting weight and high installation difficulty in existing installation methods for blast furnace tuyere sleeves. The technical solution adopted by this invention is as follows: First, a support frame is installed inside the furnace shell at the blast furnace tuyere location; then, the tuyere sleeve is lifted to the blast furnace tuyere location outside the furnace shell, with the tuyere sleeve connected to a cable, using the support frame as the pulling force point, and the tuyere sleeve is pulled into the blast furnace tuyere through the cable; finally, the tuyere sleeve is secured, and then the cable is released. This invention is used to lift and install the tuyere sleeve at the blast furnace tuyere, achieving the purpose of rapid and accurate installation of the tuyere sleeve.

Description

Technical Field

[0001] This invention relates to the field of iron or steel smelting technology, and specifically to a method for installing a blast furnace tuyeres sleeve. Background Technology

[0002] Blast furnace tuyeres consist of tuyere flanges, as well as large, medium, and small tuyere sleeves. During tuyere installation, the tuyere flanges are typically installed first, their position adjusted, and then welded to the furnace shell. The large, medium, and small tuyere sleeves are then installed sequentially. The large tuyere sleeve has a sloping working surface, making it difficult to operate, slowing down the installation process, and posing a high safety risk to workers.

[0003] Patent application CN 104946837 A discloses an off-line assembly and overall installation method for the large, medium, and small tuyere sleeves of a blast furnace. First, the large, medium, and small tuyere sleeves are assembled off-line using an assembly jig. Then, the assembled unit is hoisted into the blast furnace to complete the overall installation. This method avoids the difficulty of aligning each individual tuyere sleeve (large, medium, and small) during installation, thus improving installation accuracy. However, it requires lifting and installing the jig and the entire assembly of the large, medium, and small tuyere sleeves, resulting in significant lifting weight and high overall installation difficulty.

[0004] Patent CN 212893444 U discloses a blast furnace tuyere sleeve installation device, including a support frame, a fixing plate, and a counterweight box. The tuyere sleeve is fixed to the fixing plate of the device using bolts. The tuyere sleeve and the device are then lifted as a whole, and the tuyere sleeve is installed. After the sleeve is fixed to the tuyere flange, the device can be pulled out to install the next tuyere sleeve. This device and its corresponding installation method also require lifting and installing the tuyere sleeve and the device as a whole, which also presents the problems of large lifting weight and high installation difficulty. Furthermore, the tuyere sleeve relies on two chain hoists outside the furnace shell to push it into the tuyere flange of the furnace shell, which places high demands on the crane used in conjunction with the two chain hoists, often requiring a large-tonnage crane, increasing construction difficulty and cost. Summary of the Invention

[0005] This invention provides a method for installing a large blast furnace tuyere sleeve, which solves the problems of large lifting weight and high installation difficulty in existing installation methods for large blast furnace tuyere sleeves.

[0006] The technical solution adopted in this invention is as follows: a method for installing a blast furnace tuyere sleeve. First, a support frame is installed inside the furnace shell at the blast furnace tuyere location. Then, the tuyere sleeve is lifted to the blast furnace tuyere location outside the furnace shell. The tuyere sleeve is connected to a cable, and the support frame is used as the pulling force point. The cable is used to pull the tuyere sleeve into the blast furnace tuyere. Finally, the tuyere sleeve is fixed and the cable is released.

[0007] To facilitate the placement of the tuyeres before they are pulled into the blast furnace tuyeres, the following further requirement is that the line connecting the pulling force point and the center point of the blast furnace tuyeres is horizontal and passes through the vertical center line of the furnace shell.

[0008] In order to quickly and accurately pull the tuyeres into the blast furnace tuyeres, the tuyeres are further equipped with two positioning pins, and the cable connecting one end of the tuyeres is divided into two strands and connected to the two positioning pins respectively.

[0009] To facilitate the rotation and adjustment of the tuyere sleeve, a further method is employed: after hoisting the tuyere sleeve to the blast furnace tuyere outside the furnace shell, its position is adjusted by rotation, and then the tuyere sleeve is pulled into the blast furnace tuyere. For example, the tuyere sleeve has two positioning pins, which are respectively connected to the hooks of two sets of hand-operated hoists. The two sets of hand-operated hoists are installed on both sides of the blast furnace tuyere outside the furnace shell, and the position of the tuyere sleeve is adjusted by rotating the two sets of hand-operated hoists.

[0010] To facilitate the operation of pulling the tuyeres via cable inside the furnace shell, one end of the cable is connected to the tuyeres, and the other end is connected to the hook of a hand-operated hoist, which is connected to the tension point of the support frame.

[0011] Considering the weight of the large vent hoist, specifically: the rated load capacity of the hand chain hoist is 3 tons, and the cable is a 16mm diameter steel wire rope.

[0012] Based on the stress characteristics of the support frame, and to simplify the structure of the support frame, the following further details are provided: the outer contour of the support frame is a pyramid, the side edges of the pyramid are support rods, one end of each support rod is placed around the blast furnace tuyeres and forms the base of the pyramid, the other end of each support rod is fixed to the outer periphery of the connecting pipe, the center line of the connecting pipe forms an angle equal to that between any two support rods, and the tension point of the mounting frame is the connecting pipe.

[0013] To ensure the strength of the support frame itself, specifically: both the support rods and connecting pipes are steel pipes, with one end of each support rod welded to the outer circumference of the connecting pipe. For example, the connecting pipe is a DN50 steel pipe with a length of 1.8m; the support rod is a DN32 steel pipe with a length of 3.2m per rod.

[0014] The beneficial effects of this invention are as follows: By installing a support frame inside the furnace shell and using the mounting frame as the pulling force point to pull the tuyer sleeve, the automatic positioning of the tuyer sleeve is facilitated, and the pulling force required to pull the tuyer sleeve is reduced, achieving the purpose of quickly and accurately lifting and installing the tuyer sleeve. The support frame can automatically remain stable during the pulling of the tuyer sleeve; therefore, the support frame does not need to be fixed inside the furnace shell, but only temporarily fixed inside. The support frame can also be reused, achieving the purpose of saving construction time and costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the blast furnace tuyeres installation method of the present invention.

[0016] Attached diagram labels: 1. Blast furnace tuyere; 2. Support frame; 3. Tuyere sleeve; 4. Cable; 5. Vertical center line; 6. Hand-operated hoist. Detailed Implementation

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] This invention is used to lift and install the large tuyere sleeve to the blast furnace tuyere. For example... Figure 1 As shown, the installation method for the blast furnace tuyeres sleeve is as follows: First, install a support frame 2 inside the furnace shell at the blast furnace tuyer 1. Then, lift the tuyeres sleeve 3 to the blast furnace tuyer 1 outside the furnace shell. Connect the tuyeres sleeve 3 to a cable 4, and use the support frame 2 as the pulling force point to pull the tuyeres sleeve 3 into the blast furnace tuyer 1. Finally, secure the tuyeres sleeve 3 and release the cable 4. After releasing the cable 4, the support frame 2 can be moved to the next blast furnace tuyer 1, and the installation of the next tuyeres sleeve 3 can be carried out according to the above installation method.

[0019] This invention utilizes a cable 4 to pull the tuyer sleeve 3 into the blast furnace tuyer 1 from inside the furnace shell. A support frame 2 provides a reaction force for the cable 4 and also guides its movement. The support frame 2 is installed inside the furnace shell at the blast furnace tuyer 1, transferring its own force to the furnace shell. Based on the force characteristics of the support frame 2, to simplify its structure, it includes at least three support rods and a connecting pipe. The outer contour of the support frame 2 is pyramidal, with the side edges of the pyramid forming the support rods. One end of each support rod is positioned around the blast furnace tuyer 1, forming the base of the pyramid, and the other end is fixed to the outer periphery of the connecting pipe. The cable 4 can pass through the connecting pipe to pull the tuyer sleeve 3; therefore, the pulling force point of the support frame is the connecting pipe. Based on the force characteristics of the support frame 2, it does not need to be fixed inside the furnace shell by methods such as welding; it only needs to be temporarily fixed inside the furnace shell to ensure relative stability. To ensure the strength of the support frame 2 itself, the support frame 2 is a metal frame. For example, the support rods and connecting pipes of the support frame 2 are all steel pipes, with one end of each support rod welded to the outer circumference of the connecting pipe. For another example, the connecting pipe is a DN50 steel pipe with a length of 1.8m; the support rods are DN32 steel pipes with a length of 3.2m each, and there are three support rods. To balance the force on the support frame 2 itself, the angle formed by the centerline of the connecting pipe and any two support rods is equal. To facilitate the positioning of the tuyeres sleeve 3 before it is pulled into the blast furnace tuyeres 1, the line connecting the pulling force point and the center point of the blast furnace tuyeres 1 is horizontal and passes through the vertical centerline 5 of the furnace shell. That is, the center point of the blast furnace tuyeres 1 is located at the centerline of the connecting pipe, and the centerline of the connecting pipe is horizontal and perpendicular to the vertical centerline 5 of the furnace shell.

[0020] When the tuyere sleeve 3 is lifted to the blast furnace tuyere 1 outside the furnace shell, its position can be adjusted to automatically rotate and adjust it during lifting. In actual construction, there may be situations where it is necessary to rotate and adjust the tuyere sleeve 3. To facilitate this adjustment, after lifting the tuyere sleeve 3 to the blast furnace tuyere 1 outside the furnace shell, its position is adjusted by rotation before being pulled into the blast furnace tuyere 1. For example, the tuyere sleeve 3 has two locating pins, symmetrically arranged around its center. These pins are connected to the hooks of two sets of hand-operated hoists, which are installed on both sides of the blast furnace tuyere 1 outside the furnace shell. The position of the tuyere sleeve 3 can be adjusted by coordinating the two hoists.

[0021] The cable 4 can be connected to any position on the tuyer sleeve 3 for pulling. Since the tuyer sleeve 3 has two positioning pins, based on its shape and characteristics, to quickly and accurately pull the tuyer sleeve 3 into the blast furnace tuyer 1, one end of the cable 4 connected to the tuyer sleeve 3 is split into two strands and connected to the two positioning pins respectively, forming a Y-shape. The cable 4 can then pass through the support frame 2 and be pulled using a winch. A fixed pulley can be installed on the support frame 2, and the cable 4 passes through it. Considering the relatively light weight of the tuyer sleeve 3, to facilitate operation inside the furnace shell, one end of the cable 4 is connected to the tuyer sleeve 3, and the other end is connected to the hook of the hand-operated hoist 6. The hand-operated hoist 6 is connected to the pulling force point of the support frame 2. Considering the force required to pull the tuyer sleeve 3, the rated load capacity of the hand-operated hoist 6 is 3 tons, and the cable 4 is a 16mm diameter steel wire rope.

Claims

1. A method for installing a large tuyere sleeve in a blast furnace, characterized in that: First, install a support frame (2) inside the furnace shell and at the blast furnace tuyer (1); then, lift the tuyer sleeve (3) to the blast furnace tuyer (1) outside the furnace shell, connect the tuyer sleeve (3) to the cable (4), and use the support frame (2) as the pulling force point to pull the tuyer sleeve (3) into the blast furnace tuyer (1) through the cable (4); finally, fix the tuyer sleeve (3) and then release the cable (4).

2. The method for installing a large blast furnace tuyeres sleeve as described in claim 1, characterized in that: The line connecting the point of tension and the center point of the blast furnace tuyeres (1) is horizontal and passes through the vertical center line (5) of the furnace shell.

3. The method of installing a large bustle pipe of a blast furnace according to claim 1, characterized in that: The vent sleeve (3) has two positioning pins. The cable (4) is connected to one end of the vent sleeve (3), which is divided into two strands and connected to the two positioning pins respectively.

4. The blast furnace tuyere sleeve installation method as described in claim 1, after the tuyere sleeve (3) is lifted to the blast furnace tuyere (1) outside the furnace shell, the position of the tuyere sleeve (3) is rotated and adjusted, and then the tuyere sleeve (3) is pulled into the blast furnace tuyere (1).

5. The method of installing a large bustle pipe of a blast furnace according to claim 4, characterized in that: The tuyere sleeve (3) has two positioning pins, which are connected to the hooks of two sets of hand chain hoists respectively. The two sets of hand chain hoists are installed on both sides of the blast furnace tuyere (1) outside the furnace shell. The position of the tuyere sleeve (3) is adjusted by rotating the two sets of hand chain hoists.

6. The method of installing a large bustle pipe of a blast furnace according to claim 1, characterized in that: One end of the cable (4) is connected to the large sleeve of the air vent (3), and the other end of the cable (4) is connected to the hook of the hand chain hoist (6). The hand chain hoist (6) is connected to the tension point of the support frame (2).

7. The method for installing a large blast furnace tuyeres sleeve as described in claim 6, characterized in that: The rated load capacity of the hand chain hoist (6) is 3 tons, and the cable (4) is a steel wire rope with a diameter of 16mm.

8. The method of installing a large bustle pipe of a blast furnace according to any one of claims 1 to 7, characterized in that: The outer contour of the support frame (2) is a pyramid, and the side edges of the pyramid are support rods. One end of each support rod is placed around the blast furnace tuyeres (1) and forms the base of the pyramid. The other end of each support rod is fixed to the outer periphery of the connecting pipe. The center line of the connecting pipe forms an angle equal to that between any two support rods. The tension point of the mounting frame is the connecting pipe.

9. The method of installing a large bustle pipe of a blast furnace according to claim 8, characterized in that: Both the support rods and the connecting pipes are made of steel pipes, with one end of each support rod welded to the outer circumference of the connecting pipe.

10. The method of installing a large bustle pipe of a blast furnace according to claim 8, characterized by: The connecting pipe is a DN50 steel pipe with a length of 1.8m; the support rod is a DN32 steel pipe with a length of 3.2m per rod.

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