Method for quickly replacing fixed section flue of large converter

Abstract

This invention discloses a method for rapid replacement of a fixed section flue in a large converter, comprising the following steps: After the converter is shut down and cooled, the furnace is dismantled, the movable section flue is removed, and the removable flue is dismantled; the converter is straightened, and a temporary construction platform is installed on the converter support ring; a flue lifting device is installed under the fixed section flue to be replaced; after removing the connecting parts and accessories of the fixed section flue to be replaced, the fixed section flue to be replaced is lifted above the fully enclosed top panel of the converter, and then removed; the fixed section flue to be replaced is hoisted onto the hydraulic lifting device for the removable flue and secured with the annular clamp groove on the hydraulic lifting device; the fixed section flue to be replaced is lowered to the installation position; the flue lifting device and the temporary construction platform are removed; and the components are reinstalled. This method utilizes the existing hydraulic lifting device for the removable flue to complete the replacement of the fixed section flue, eliminating the need to remove the fully enclosed top panel of the converter, thus reducing safety hazards and increasing construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment maintenance technology, and to a method for rapid replacement of fixed section flue gas in large converters. In particular, it relates to a method for replacing fixed section flue gas in large converters that can greatly improve the efficiency of replacement and the safety of the construction process. Background Technology

[0002] In recent years, to facilitate subsequent maintenance, the traditional fixed section of the flue at the furnace mouth in large converters has been decomposed into a fixed section and a movable section. When replacing the flue, it is simpler than replacing the traditional fixed section. The movable section can be moved away to carry out the replacement operation, reducing the two steps of removing the furnace front smoke damper and the furnace front smoke damper beam, reducing construction time and improving construction efficiency.

[0003] To achieve rapid and efficient dismantling of movable flue sections, CN 201210111947.0 discloses a method for the maintenance, dismantling, and hoisting of movable flue sections at the converter mouth. Specifically, it utilizes a reasonably configured lifting device to complete the dismantling and maintenance of the movable flue section without removing the upper components. However, this method is only applicable to the replacement and dismantling of movable flue sections and cannot meet the requirements for the replacement and dismantling of fixed flue sections. CN 201810781788.2 discloses a process for the later-stage maintenance and partial replacement of vaporization flue sections in large converter waste heat boilers. Specifically, it involves fabricating flue sections, cutting off fatigued and leaking portions of the original flue, and installing the flue sections on-site. However, this process is relatively complex, inconvenient to install, and has low construction efficiency, indicating significant room for improvement.

[0004] The above technologies cannot achieve efficient replacement of fixed flue sections. The current replacement of fixed flue sections has the following inconveniences: (1) It is necessary to remove the fully enclosed top panel of the converter, which cannot avoid the formation of edge holes around the fixed flue section. When the workers carry out the replacement work, there is a risk of falling from a height, which poses a great safety hazard. (2) The process of removing the fully enclosed top panel of the converter increases the construction time and reduces the construction efficiency.

[0005] Therefore, developing a method for replacing the fixed section flue of a large converter that can greatly improve the efficiency of replacing the flue and the safety of the construction process is of great practical significance. Summary of the Invention

[0006] Due to the aforementioned deficiencies in existing technologies, this invention provides a method for replacing the fixed section flue of a large converter, which can greatly improve the efficiency of replacing the fixed section flue and the safety of the construction process. Specifically, it utilizes the existing hydraulic lifting device for the movable flue to complete the replacement of the fixed section flue. This method eliminates the need to remove the fully enclosed top panel of the converter, avoiding the formation of edge holes around the fixed section flue, reducing safety hazards. At the same time, it reduces the removal process of the fully enclosed top panel of the converter, shortens the construction time, and improves construction efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for rapid replacement of a fixed section of flue gas in a large converter, comprising the following steps:

[0009] (1) After the converter is shut down, it is cooled and dismantled, the movable flue section is moved away and the movable flue is removed;

[0010] (2) The converter is straightened and a temporary construction platform is installed on the converter support ring. The temporary construction platform includes a platform panel and platform legs. Multiple platform legs perpendicular to the platform panel are provided below the platform panel. The platform panel is located between the converter body and the fixed section flue, and it is fixed to the converter support ring by the platform legs.

[0011] (3) Install the flue lifting device on the lower side of the fixed section of flue to be replaced. The flue lifting device includes a cylindrical body. The cylindrical body is provided with a reinforcing connecting plate for strengthening the structure. One end of the cylindrical body is provided with an annular clamping groove for clamping the fixed section of flue. The other end is provided with a hydraulic device connecting plate for connecting with the movable flue hydraulic lifting device. The flue lifting device is clamped to the fixed section of flue to be replaced through the annular clamping groove and connected to the movable flue hydraulic lifting device through the hydraulic device connecting plate.

[0012] (4) After removing the connecting parts and accessories of the fixed section flue to be replaced, use the hydraulic lifting device of the movable flue to lift the fixed section flue to be replaced to the top panel of the converter fully enclosed, and then remove the fixed section flue to be replaced.

[0013] (5) The replacement fixed section of the flue is hoisted onto the movable flue hydraulic lifting device and fixed to the annular clamp groove on the movable flue hydraulic lifting device.

[0014] (6) Use the hydraulic lifting device of the movable flue to lower the replacement fixed section flue to the installation position and install the connecting parts of the replacement fixed section flue.

[0015] (7) Remove the flue jacking device and temporary construction platform;

[0016] (8) Reinstall the movable flue and restore the movable flue and replace the accessories of the fixed flue section, move the movable flue section back, and complete the replacement construction of the fixed flue section.

[0017] The present invention provides a method for rapid replacement of fixed section flue in large converters. By utilizing the existing hydraulic lifting device for movable flues (which can be used to lift / lower the fixed section flue via a self-made temporary construction platform and flue lifting device), the fixed section flue can be replaced without removing the fully enclosed top panel of the converter. This avoids the formation of edge holes around the fixed section flue, reducing safety hazards. At the same time, it reduces the removal of the fully enclosed top panel of the converter, greatly shortens the construction time, and significantly improves construction efficiency, making it highly promising for application.

[0018] As a preferred technical solution:

[0019] In the above-described method for rapid replacement of a fixed section of flue in a large converter, the temporary construction platform and flue lifting device are hoisted after being fabricated on the ground.

[0020] As described above, in a method for rapid replacement of a fixed section flue in a large converter, the platform panel is octagonal and has a pattern on its top.

[0021] The platform panel is also equipped with a fence on its upper outer edge.

[0022] The platform legs are welded to the converter support ring.

[0023] As described above, in the method for rapid replacement of a fixed section flue in a large converter, the cylindrical main body is a cylindrical structure.

[0024] The reinforcing connecting plate is in the shape of a cross and is welded to the inner wall of the cylindrical main body;

[0025] The hydraulic device has multiple connecting plates, which are arranged around the circumference of the cylindrical main body and welded to the outer wall of the cylindrical main body.

[0026] As described above, in a method for rapid replacement of a fixed section flue in a large converter, the hydraulic device connecting plate consists of four pieces, and the hydraulic device connecting plate is coplanar with the axis of symmetry of the cylindrical body.

[0027] As described above, in the method for quickly replacing the fixed section of a large converter flue, the specific operation for removing the movable flue is as follows:

[0028] Using a hydraulic lifting device, the movable flue is lowered to the converter mouth. The connection between the movable flue and the hydraulic lifting device, as well as the inlet and outlet water pipes of the movable flue, are removed, so that the movable flue is disconnected from the hydraulic lifting device and the inlet and outlet water pipes. The movable flue is then swung to the front of the converter using a converter rocking device. The movable flue is then lifted by a crane in front of the converter and transported to the location designated by the owner.

[0029] As described above, in a method for rapid replacement of a fixed section of flue in a large converter, the installation and dismantling of the temporary construction platform and flue jacking device are accomplished using a furnace crane, forklift, and hand-operated hoist.

[0030] As described above, in a method for rapid replacement of a fixed section flue in a large converter, the connecting parts of the fixed section flue to be replaced and the connecting parts of the fixed section flue for replacement are fixed section flue bracket connecting bolts.

[0031] The accessory to be replaced in the fixed section of the flue is the inlet and outlet water pipe of the fixed section of the flue;

[0032] The accessory of the movable flue is the inlet and outlet water pipe of the movable flue.

[0033] The above-described method for rapid replacement of a fixed section flue in a large converter is described in which the replacement of the fixed section flue is accomplished using a crane behind the furnace.

[0034] The above invention has the following advantages or beneficial effects:

[0035] The present invention provides a method for rapid replacement of fixed section flue in large converters. By utilizing the existing hydraulic lifting device for movable flues (which can be used to lift / lower the fixed section flue via a self-made temporary construction platform and flue lifting device), the fixed section flue can be replaced without removing the fully enclosed top panel of the converter. This avoids the formation of edge holes around the fixed section flue, reducing safety hazards. At the same time, it reduces the removal of the fully enclosed top panel of the converter, shortens construction time, and improves construction efficiency, making it highly promising for application. Attached Figure Description

[0036] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not drawn to scale; their focus is on illustrating the gist of the invention.

[0037] Figure 1 and 2 These are the front view and top view of the temporary construction platform, respectively.

[0038] Figure 3 This is a top view of the flue gas jacking device;

[0039] Figure 4 A schematic diagram of the installation of a temporary construction platform;

[0040] Figure 5 A schematic diagram showing the connection between the flue jacking device and the fixed section of the flue;

[0041] Among them, 1-platform panel, 2-platform support leg, 3-fence, 4-cylindrical main body, 5-reinforced connecting plate, 6-hydraulic device connecting plate, 7-fixed section flue, 8-converter fully enclosed top panel, 9-temporary construction platform, 10-converter body, 11-annular clamp groove. Detailed Implementation

[0042] The structure of the present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0043] Example 1

[0044] A method for rapid replacement of a fixed section of flue gas in a large converter includes the following steps:

[0045] Step 1: Preparation

[0046] 1.1 Before shutting down the converter, a temporary construction platform (such as...) shall be constructed according to the dimensions of the converter support ring and the hydraulic lifting device for the movable flue. Figure 1 and 2 As shown), the temporary construction platform 9 is an octagon, including a platform panel 1 (with a pattern on the top) and platform legs 2 (made of I-beams, the length of which is determined according to the size of the converter support ring to the furnace mouth). Multiple platform legs 2 perpendicular to the platform panel 1 are welded to the bottom of the platform panel 1. The outer edge of the platform panel 1 is provided with a channel steel beam, and the upper outer edge of the platform panel 1 is also provided with a fence 3 to ensure construction safety.

[0047] 1.2 Before the converter is shut down, a fixed section flue jacking device (such as...) shall be fabricated according to the dimensions of the fixed section flue. Figure 3 As shown), the flue lifting device is cylindrical and made of cylindrical steel plate (cylindrical body 4). The cylindrical steel plate (cylindrical body 4) has a cross-shaped reinforcing connecting plate 5 welded inside to increase the strength of the lifting device. One end of the cylindrical body 4 is provided with an annular clamping groove 11 for clamping and fixing the flue section, and the other end is provided with a hydraulic device connecting plate 6 for connecting with the movable flue hydraulic lifting device. The position of this connecting plate is the same as the position of the movable flue hydraulic lifting device (there are four hydraulic device connecting plates, which are arranged around the circumference of the cylindrical body and welded to the outer wall of the cylindrical body. The hydraulic device connecting plates are coplanar with the axis of symmetry of the cylindrical body).

[0048] Step Two: Fixed Section Flue Replacement Process

[0049] 2.1 After the converter is shut down, proceed with the cooling and dismantling process according to normal procedures, and remove the moving section of the flue.

[0050] 2.2 Following the traditional method of replacing movable flues, a hydraulic lifting device is used to lower the movable flue to the converter mouth. The connection between the movable flue and the hydraulic lifting device, as well as the inlet and outlet water pipes of the movable flue, are removed to detach the movable flue from the hydraulic lifting device and the inlet and outlet water pipes. The movable flue is then swung to the front of the converter using a converter rocking mechanism. The movable flue is then lifted by a crane in front of the converter and transported to the location designated by the owner.

[0051] 2.3 Straighten the converter, and use equipment such as overhead cranes and forklifts to install the temporary construction platform 9 onto the converter support ring (e.g., Figure 4 (as shown);

[0052] 2.4 Workers will operate on a temporary construction platform, using overhead cranes, forklifts, and other equipment to install the flue jacking device to the lower part of the fixed flue section 7. The jacking device connecting plate will be connected to the hydraulic lifting device of the movable flue, and the annular clamp groove 11 will be connected to the clamp of the fixed flue section 7 (e.g., ...). Figure 5 (as shown);

[0053] 2.5 Remove the connecting bolts of the bracket of the fixed section flue and the inlet and outlet pipes of the fixed section flue to separate the fixed section flue from the base and the inlet and outlet pipes of the fixed section flue;

[0054] 2.6 Using the hydraulic lifting device of the movable flue, the fixed section of the flue is lifted to the top panel of the converter's fully enclosed top panel, the old fixed section of the flue is lifted by the furnace rear crane and transported to the location designated by the owner;

[0055] 2.7 Using the furnace rear crane, the new fixed section of the flue is hoisted to the installation position and placed on the flue jacking device;

[0056] 2.8 Using the hydraulic lifting device for the movable flue, lower the new fixed section of the flue to the installation position and connect the bracket connecting bolts of the fixed section of the flue;

[0057] 2.9 After the fixed section of the flue is installed in place, remove the connecting bolts between the flue jacking device and the movable flue hydraulic lifting device, separate the flue jacking device and the movable flue hydraulic lifting device, and use tools such as furnace cranes, forklifts, and hand hoists to dismantle the flue jacking device and hoist it to the location designated by the owner.

[0058] 2.10 Using equipment such as furnace cranes, forklifts, and hand chain hoists, the temporary construction platform was removed from the furnace opening and hoisted to the location designated by the owner.

[0059] 2.11 Reinstall the movable flue and restore the inlet and outlet water pipes of both the movable and fixed flue sections;

[0060] 2.12 Move the mobile section of the flue back to the working position to complete the replacement of the fixed section of the flue.

[0061] Those skilled in the art should understand that variations can be implemented by combining existing technology with the above embodiments, which will not be elaborated here. Such variations do not affect the essence of the present invention, and will not be elaborated here either.

[0062] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A method for rapid replacement of a fixed section flue of a large converter, characterized in that: The steps are as follows: (1) After the converter is shut down, it is cooled and dismantled, the moving section of the flue is moved away and the movable flue is removed; (2) The converter is straightened and a temporary construction platform is installed on the converter support ring. The temporary construction platform includes a platform panel and platform legs. Multiple platform legs perpendicular to the platform panel are provided below the platform panel. The platform panel is located between the converter body and the fixed section flue, and it is fixed to the converter support ring by the platform legs. (3) Install the flue lifting device on the lower side of the fixed section of flue to be replaced. The flue lifting device includes a cylindrical body, and a reinforcing connecting plate for strengthening the structure is provided inside the cylindrical body. One end of the cylindrical body is provided with an annular clamping groove for clamping the fixed section of flue, and the other end is provided with a hydraulic device connecting plate for connecting with the movable flue hydraulic lifting device. The flue lifting device is clamped to the fixed section of flue to be replaced through the annular clamping groove and connected to the movable flue hydraulic lifting device through the hydraulic device connecting plate. (4) After removing the connecting parts and accessories of the fixed section flue to be replaced, use the hydraulic lifting device of the movable flue to lift the fixed section flue to be replaced to the top panel of the converter fully enclosed, and then remove the fixed section flue to be replaced. (5) The replacement fixed section of the flue is hoisted onto the flue jacking device and fixed with the annular clamp groove on the flue jacking device; (6) Use the hydraulic lifting device of the movable flue to lower the replacement fixed section flue to the installation position and install the connecting parts of the replacement fixed section flue; (7) Remove the flue jacking device and temporary construction platform; (8) Reinstall the movable flue and restore the movable flue and replace the accessories of the fixed flue section, and move the movable flue section back.

2. A method according to claim 1, wherein, The temporary construction platform and flue lifting device were hoisted after being fabricated on the ground.

3. A method according to claim 2, wherein, The platform panel is in the shape of a regular octagon and has a pattern on its top. The platform panel is also equipped with a fence on its upper outer edge. The platform legs are welded to the converter support ring.

4. A method according to claim 1, wherein, The cylindrical main body has a cylindrical structure; The reinforcing connecting plate is in the shape of a cross and is welded to the inner wall of the cylindrical main body; The hydraulic device has multiple connecting plates, which are arranged around the circumference of the cylindrical main body and welded to the outer wall of the cylindrical main body.

5. A method according to claim 4, wherein, The hydraulic device has four connecting plates, and the connecting plates are coplanar with the axis of symmetry of the cylindrical body.

6. A method of rapid replacement of a fixed section flue of a large converter according to claim 1, characterized in that, The specific procedure for dismantling the movable flue is as follows: Using a hydraulic lifting device, the movable flue is lowered to the converter mouth. The connection between the movable flue and the hydraulic lifting device, as well as the inlet and outlet water pipes of the movable flue, are removed. The movable flue is then rocked to the front of the converter using a converter rocking device. The movable flue is then lifted by a crane in front of the converter and transported to the designated location.

7. A method according to claim 1, wherein, The installation and dismantling of the temporary construction platform and flue jacking device were carried out using a furnace crane, forklift, and hand-operated hoist.

8. A method according to claim 1, wherein, The connecting parts of the fixed section flue to be replaced and the connecting parts of the fixed section flue to be replaced are fixed section flue bracket connecting bolts. The accessory to be replaced in the fixed section of the flue is the inlet and outlet water pipe of the fixed section of the flue; The accessory of the movable flue is the inlet and outlet water pipe of the movable flue.

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