Combined installation method of steelmaking secondary dust removal furnace front dust removal cover

Abstract

The present application provides a kind of steelmaking secondary dust removal furnace front dust cover combined installation method, comprising the following steps: step one, preparation, step two, making hoisting workpiece, step three, install temporary cantilever support on dust cover support structure, step four, secondary dust removal furnace front dust cover assembly, step five, secondary dust removal furnace front dust cover assembly hoisting, step six, remove temporary cantilever support, step seven, install dust cover door curtain below furnace front dust cover body.The technical scheme of the present application can save the use of large hoisting equipment, effectively solve the lifting height and the limit of front lifting position, realize the efficient, high-quality and safe lifting of secondary dust removal furnace front door dust cover, and the method of the present application can also effectively avoid or reduce the danger brought by high-altitude operation, realize the simple and convenient installation of secondary dust removal furnace front dust cover.

Description

Technical Field

[0001] This invention belongs to the field of industrial building installation technology, and in particular relates to a combined installation method for a dust removal hood in front of a secondary dust removal furnace in steelmaking. Background Technology

[0002] The secondary dust removal system in steelmaking absorbs the large amounts of flue gas and dust generated in the enclosed smoke-proof chamber of the converter during the oxygen blowing smelting process in the steelmaking converter, creating a good working environment for the steelmaking workshop. The secondary dust removal system consists of a furnace-front dust removal hood, secondary dust removal pipelines, and dust removal equipment. The difficulty in installing the secondary dust removal system lies in the installation of the furnace-front dust removal hood, which comprises the hood body, left and right side baffles, the hood curtain, and the refractory castable inside the hood. The installation position is located on the hood support structure directly above the converter furnace, close to the charging bridge crane beam. The overall weight reaches 30 tons, with a length of 15 meters, a height of 9 meters, and a width of 3 meters. It is a large portal structure with limited lifting space, typically making installation impossible using a truck crane. Using a charging bridge crane is also not feasible due to crane lifting height and furnace-front lifting limit limitations, preventing direct lifting into position.

[0003] A search revealed existing publications regarding installation methods for large converter dust hoods, such as Chinese Patent Application No. 202011021965.0, filed on September 25, 2020, entitled "An Installation Method for a Dust Hood in a Confined Space." This application implements the method through the following steps: S1, based on on-site construction conditions, the dust hood is divided into multiple parts, and each part is assembled individually on a platform at the same height; S2, based on the on-site installation environment, the installation sequence of each part is determined, with the easier parts installed first, and then each part is vertically lifted and hoisted individually using an electric chain hoist according to the determined installation sequence. The installation process for each part is identical. While this application achieves the hoisting of a large dust hood in a confined space by dividing the dust hood into multiple parts and hoisting each part separately, the hoisting operation is cumbersome, and welding assembly is required after hoisting to obtain a complete dust hood. Welding operations are inconvenient, difficult, and result in low construction efficiency. Summary of the Invention

[0004] 1. The problem to be solved

[0005] To address the shortcomings mentioned in the background technology, this invention provides a combined installation method for the dust collector hood in front of a secondary dust removal furnace in steelmaking. This method effectively solves the limitations of hoisting height and the extreme position of hoisting in front of the furnace, achieving efficient, high-quality, and safe hoisting of the dust collector hood in front of the secondary dust removal furnace. It significantly reduces the number of hoisting operations and high-altitude work, ensuring the smooth implementation of the entire installation process. At the same time, it improves construction efficiency and guarantees construction quality. Compared with traditional installation methods, this method has significant advantages and innovation.

[0006] 2. Technical Solution

[0007] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0008] This invention relates to a method for assembling and installing a dust collector hood in front of a steelmaking furnace. The method utilizes a charging trolley to assemble the dust collector hood in front of the secondary dust collector furnace on the ground in the charging span. It involves fabricating and using lifting components to assemble and hoist the dust collector hood. Compared to traditional methods for installing large dust collector hoods, this method significantly reduces the difficulty and number of hoisting operations, minimizes high-altitude work, and effectively improves construction efficiency and quality. Specifically, the method is carried out according to the following steps:

[0009] 1. Preparation

[0010] 1.1 The roof system, the material feeding span crane beam system, and the dust hood support structure located in the secondary dust hood installation area shall be installed and accepted, so that the conditions for dust hood installation shall be met.

[0011] 1.2 Ensure that the necessary equipment, refractory castables, and related construction equipment for the installation of the secondary dust removal hood have arrived on site.

[0012] 2. Fabrication of hoisting workpieces

[0013] The lifting workpiece is made of H-beams and consists of a main structure and positioning components. The main structure comprises two longitudinal H-beams and three transverse connecting beams, forming a stable load-bearing structure to ensure no deformation occurs during lifting. Four H-beam positioning components are installed on one side of the main structure, with two positioning components on each longitudinal main beam. The distance between two positioning components on the same main beam is approximately 50mm wider than the width of the furnace front dust collector hood body, ensuring that the furnace front dust collector hood body can quickly enter the two positioning components. Positioning bolts are installed on the upper part of the two outermost positioning components; tightening these bolts ensures that the secondary dust collector furnace front dust collector hood assembly does not shake during the entire transfer and lifting process.

[0014] 3. Install temporary cantilever supports on the dust collector hood support structure.

[0015] Temporary cantilever supports were fabricated using H-beams and pre-installed on the dust collector hood support structure. The temporary cantilever supports were aligned with the dust collector hood support structure at the same elevation. A layer of yellow glycerin was applied to the top of both the temporary cantilever supports and the dust collector hood support structure to reduce sliding friction resistance when the secondary dust collector hood assembly moves laterally on these supports. Simultaneously, by setting up temporary cantilever supports at the same elevation as the dust collector hood support structure, the problem of being unable to lift the secondary dust collector hood assembly using a feeding straddle crane due to lifting limit position restrictions was effectively solved.

[0016] 4. Assembly of the dust collection hood in front of the secondary dust collector

[0017] On the open ground of the charging span, the left and right wind baffles are assembled onto the main body of the furnace front dust collector hood, and asbestos rope is set between the two flange faces to ensure effective sealing of the dust collector hood; refractory castable is sprayed inside the dust collector hood using a spraying machine, thus assembling the secondary dust collector furnace front dust collector hood assembly.

[0018] 5. Hoisting of the dust collector hood assembly in front of the secondary dust collector furnace

[0019] 5.1 Turning over the dust collector hood assembly in front of the secondary dust collector furnace

[0020] The upper part of the dust collector hood assembly is attached to the hook of the feeding trolley using steel wire ropes, and the lower part is attached to the hook of the truck crane using steel wire ropes. Through the cooperation of the feeding trolley at the main lifting point and the truck crane at the auxiliary lifting point, the horizontal dust collector hood assembly is gradually transformed into a vertical position and lowered back to the ground. Temporary supports made of H-beams are set on both sides of the left and right wind deflectors to ensure that the dust collector hood assembly does not tip over during subsequent work.

[0021] 5.2 Install and use the hoisted workpiece

[0022] Use the feeding gantry crane to lift the workpiece. On the other end of the workpiece without a positioning device, use a wire rope and a matching hoist to attach a counterweight. Use the feeding gantry crane to embed the positioning device of the workpiece into the middle of the secondary dust removal furnace front dust hood assembly. Tighten the positioning bolts on the upper part of the positioning device to secure the secondary dust removal furnace front dust hood assembly to the workpiece, preventing swaying during lifting. Use the feeding gantry crane to lift the workpiece, allowing the secondary dust removal furnace front dust hood assembly and the counterweight to leave the ground simultaneously. If the secondary dust removal furnace front dust hood assembly and the counterweight do not leave the ground simultaneously, adjust the wire rope and the matching hoist to ensure they leave the ground at the same time, maintaining the balance of the secondary dust removal furnace front dust hood assembly. Remove the temporary supports on the left and right side wind deflectors.

[0023] 5.3 Installation of the dust collector hood assembly in front of the secondary dust collector furnace

[0024] Using a feeding trolley, move the secondary dust removal furnace front dust hood assembly to the front of the installation position. Slowly move the assembly towards the furnace front installation position until it reaches the temporary cantilever support. Hang the wire rope and traction hoist on the side wall of the assembly, and tighten the hoist to ensure the wire rope is under slight tension, thus securing the assembly. Simultaneously, loosen the hoist at one end of the lifting workpiece to slowly lower the counterweight onto the furnace front platform and remove it. At the same time, loosen the positioning bolts on the upper part of the positioning device to separate the lifting workpiece from the furnace front dust hood body. Use the feeding trolley to lower the workpiece back onto the furnace front platform.

[0025] By tightening the traction hoist installed on the dust collector hood assembly in front of the secondary dust collector, the assembly is slowly moved towards the crane beam side of the feeding span. After reaching the installation position, the assembly is firmly welded to the dust collector hood support structure, and the wire rope and traction hoist are removed.

[0026] 6. Remove temporary cantilever supports

[0027] The temporary cantilever supports were removed to create conditions for the subsequent installation of the furnace front fire baffle.

[0028] 7. Install the dust removal hood curtain below the main body of the furnace dust removal hood.

[0029] As a further improvement of the present invention, "the installation and acceptance of the roof system and the feeding span crane beam system" provides a guarantee for the normal operation of the feeding span crane; "the installation and acceptance of the dust hood support structure" is a necessary prerequisite for the installation of the dust hood; "the arrival of secondary dust hood related equipment, refractory castable and related construction equipment on site" is a material condition for the installation of the dust hood. These are the basic conditions for mutual support and none of them can be missing.

[0030] As a further improvement of the present invention, the temporary cantilever support is a 45° angled structure made of 300*300 H-shaped steel. After being installed and welded with the column of the dust removal hood support structure, it forms a stable triangular structure that can stably support the temporary placement of the subsequent secondary dust removal furnace front dust removal hood assembly on the temporary cantilever support.

[0031] As a further improvement of the present invention, the length of the temporary cantilever support should be calculated based on the limit position that the charging crane can lift in the furnace front direction and the width of the furnace front dust hood body. To ensure that no accidents occur, its cantilever length is about 1m longer than the calculated result. The cleverly designed "temporary cantilever support" extends the installation position of the secondary dust removal furnace front dust hood assembly, effectively solving the limitation in the limit position of furnace front lifting when using the charging crane to lift the secondary dust removal furnace front dust hood assembly as a whole.

[0032] As a further improvement of the present invention, the main structure of the lifting workpiece is made of 400*400 H-beams; the positioning component of the lifting workpiece is made of 200*200 H-beams; and the positioning bolts on the upper part of the positioning component are M24*100 grade 8.8 hexagonal bolts. More optimally, the positions of the positioning component at one end of the lifting workpiece, the position of the counterweight suspension point at the other end, and the position of the main lifting point of the feeding trolley all need to be precisely calculated. This includes calculating the counterweight based on the weight of the secondary dust removal furnace front dust hood assembly and the lifting workpiece, and the counterweight is assembled from small counterweight bodies, which are appropriately increased or decreased according to the balance state during lifting. Through the cleverly designed lifting workpiece, the furnace front dust hood body is positioned above the lifting workpiece, indirectly reducing the lifting height requirement of the feeding trolley and effectively solving the limitation on lifting height when using the feeding trolley to lift the secondary dust removal furnace front dust hood assembly as a whole.

[0033] As a further improvement of the present invention, the spraying of the refractory castable inside the dust hood is completed at the ground level of the feeding area. Although this increases the weight of the hoisting, it effectively reduces high-altitude operations and improves construction efficiency compared to spraying after the dust hood is installed. At the same time, the weight of the refractory castable needs to be considered in the design of the hoisting workpiece and counterweight mentioned in step three.

[0034] As a further improvement of the present invention, the temporary support is made of 300*300 H-beams; before using the feeding straddle crane to transfer the secondary dust removal furnace front dust removal hood assembly, the temporary support must be removed, otherwise removing the temporary support after the secondary dust removal furnace front dust removal hood assembly is in place will be a high-altitude operation.

[0035] The beneficial effects achieved by this invention compared with the prior art are:

[0036] The dust hood assembly method of the present invention effectively saves the use of large lifting equipment, improves labor efficiency and reduces labor intensity, while also effectively avoiding or reducing the dangers of high-altitude operations, improving installation control, and assembling on the ground, which is convenient and reliable. Compared with high-altitude welding dust hoods, it helps to improve welding quality, thus realizing a simple and convenient installation of the dust hood in front of the secondary dust removal furnace. Attached Figure Description

[0037] Figure 1This is a schematic diagram of the main structure of the dust removal hood in front of the secondary dust removal furnace in steelmaking according to the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of the left and right baffle plates of the dust removal hood in front of the secondary dust removal furnace in steelmaking in this invention;

[0039] Figure 3 This is a top view of the structure of the workpiece being hoisted in this invention;

[0040] Figure 4 This is a schematic diagram of the main view of the hoisted workpiece in this invention;

[0041] Figure 5 This is a schematic diagram of the installation of the temporary cantilever support in this invention;

[0042] Figure 6 This is a schematic diagram of the hoisting and turning process of the dust hood assembly in this invention, as well as the installation of the dust hood assembly and the hoisted workpiece.

[0043] Figure 7 This is a schematic diagram of the hoisting process of the dust collector hood assembly.

[0044] In the picture:

[0045] 1. Dust hood body; 2. Baffle plate; 3. Dust hood curtain; 4. Refractory castable; 5. Dust hood assembly; 6. Lifting workpiece; 6-1. Main structure; 6-2. Positioning components; 6-3. Positioning bolts; 7. Counterweight; 8. Wire rope and matching hoist; 9. Dust hood support structure; 10. Temporary cantilever support; 11. Feeding trolley; 12. Truck crane; 13. Temporary support; 14. Wire rope and traction hoist; 15. Furnace front platform. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0047] It should be noted that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the present invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] The present invention will be further described below with reference to specific embodiments.

[0050] Example 1

[0051] like Figure 1-4 and Figure 7 As shown in the figure, this embodiment provides a method for assembling and installing a dust collector hood in front of a steelmaking furnace. First, the dust collector hood body 1 and the left and right side baffles 2 are assembled on the ground. Then, the assembled dust collector hood is sprayed with refractory castable 4. A set of hoisting workpieces 6, which are pre-designed and manufactured, is used to assist in the installation. The assembly of the secondary dust collector hood assembly 5 is hoisted and installed in conjunction with the feeding trolley 11. The installation method of this invention effectively solves the problems of difficulty in hoisting and poor quality of large dust collector hoods caused by the limitations of hoisting height and hoisting limit position in front of the furnace. Thus, it realizes efficient, high-quality and safe hoisting of the secondary dust collector hood in front of the furnace, significantly reduces the number of hoisting operations and reduces high-altitude operations. It has obvious advantages and creativity compared with traditional installation methods.

[0052] Specifically, such as Figures 1-5 As shown, follow these steps:

[0053] 1. Preparatory work;

[0054] 1.1 The roof system, the material feeding span crane beam system, and the dust hood support structure 9 located in the secondary dust hood installation area were installed and inspected, so that the conditions for dust hood installation were met.

[0055] 1.2 The equipment used for hoisting and installing the secondary dust removal hood, refractory castable 4, and other related construction equipment have arrived on site.

[0056] It should be noted that "the completion and acceptance of the installation of the roof system and the feeding span crane beam system" ensures the normal operation of the feeding span crane 11. "The completion and acceptance of the installation of the dust hood support structure 9" is a necessary prerequisite for the installation of the dust hood. "The arrival of secondary dust hood-related equipment, refractory castable 4, and related construction equipment on site" is a material requirement for the installation of the dust hood. These are mutually supportive fundamental conditions, and none can be omitted.

[0057] 2. Fabricate hoisting workpiece 6;

[0058] like Figure 3 and Figure 4 As shown, the lifting workpiece 6 of this invention is made of H-beams and consists of a main structure 6-1 and positioning components 6-2. The main structure 6-1 is composed of two longitudinal H-beams and three transverse connecting beams, forming a stable load-bearing structure to ensure that no deformation occurs during lifting. Four positioning components 6-2 made of H-beams are set on one side of the main structure 6-1. Each longitudinal main beam has two positioning components 6-2, which are perpendicular to the longitudinal main beams. The distance between the two positioning components 6-2 is about 50mm larger than the width of the furnace front dust collector hood body 1. This design ensures that the furnace front dust collector hood body 1 can be quickly inserted into the two positioning components 6-2. Positioning bolts 6-3 are set on the upper part of the two outermost positioning components 6-2. By tightening the positioning bolts 6-3, the secondary dust collector furnace front dust collector hood assembly 5 can be ensured to remain stable during the entire transfer and lifting process, effectively improving construction stability and safety.

[0059] As a further improvement to this embodiment, the main structure 6-1 of the hoisting workpiece 6 in this invention can be made of 400*400 H-beams, the positioning part 6-2 of the hoisting workpiece 6 can be made of 200*200 H-beams, and the positioning bolt 6-3 installed on the upper part of the positioning part 6-2 is an M24*100 grade 8.8 large hexagonal bolt.

[0060] 3. Install temporary cantilever supports 10 on the dust collector cover support structure 9;

[0061] like Figure 5 and Figure 7 As shown, a temporary cantilever support 10 is made of H-beams and installed on the dust hood support structure 9. The temporary cantilever support 10 and the dust hood support structure 9 are at the same elevation. Some yellow glycerin is applied to the top of the temporary cantilever support 10 and the dust hood support structure 9 to reduce the sliding friction resistance of the secondary dust hood assembly 5 when it moves laterally on the temporary cantilever support 10 and the dust hood support structure 9. By setting a temporary cantilever support 10 at the same elevation as the dust hood support structure 9, the installation position of the secondary dust hood assembly 5 is extended, effectively solving the problem that the secondary dust hood assembly 5 cannot be lifted by the lifting limit position when using the feeding crane 11.

[0062] As a further optimization of this embodiment, the temporary cantilever support 10 of this embodiment is a 45° angled structure made of 300*300 H-shaped steel. After being installed and welded with the column of the dust removal hood support structure 9, it becomes a stable triangular structure, which can stably support the temporary placement of the subsequent secondary dust removal furnace front dust removal hood assembly 5 on the temporary cantilever support 10.

[0063] For a more optimized approach, the length of the temporary cantilever support 10 should be calculated based on the maximum lifting position of the charging cross-line 11 car in the furnace front direction and the width of the furnace front dust removal hood body 1. To ensure that no unexpected situations occur, the length of the temporary cantilever support 10 is about 1m longer than the calculated result.

[0064] 4. Assembly of the dust collection hood in front of the secondary dust collector;

[0065] like Figure 1 and 2 As shown, on the open ground of the charging span, the left and right wind baffles 2 are assembled onto the main body 1 of the furnace front dust collector hood. Asbestos ropes are placed between the two flange faces to ensure effective sealing of the dust collector hood. Refractory castable 4 is sprayed onto the inside of the dust collector hood using a spraying machine. This completes the assembly of the secondary dust collector furnace front dust collector hood assembly 5. Although spraying the refractory castable 4 onto the dust collector hood on the ground of the charging span increases the weight of the hoisting, it effectively reduces high-altitude operations and significantly improves construction efficiency compared to spraying after the dust collector hood is installed.

[0066] 5. Hoisting of the dust collector hood assembly 5 in front of the secondary dust collector furnace;

[0067] 5.1 The overturning of the dust collector hood assembly 5 in front of the secondary dust collector furnace;

[0068] like Figure 6 As shown, the upper part of the secondary dust collector hood assembly 5 is suspended from the hook of the feeding trolley 11 using steel wire ropes, and the lower part is suspended from the hook of the truck crane 12 using steel wire ropes. Through the cooperation of the main lifting point feeding trolley 11 and the auxiliary lifting point truck crane 12, the secondary dust collector hood assembly 5, which is in a horizontal state, is gradually transformed into a vertical state and lowered back to the ground. Temporary supports 13 made of H-beams are set on both sides of the left and right wind deflectors 2 to ensure that the secondary dust collector hood assembly 5 does not tip over during subsequent work, thus improving its stability.

[0069] 5.2. Install and use the hoisted workpiece 6;

[0070] Using the feeding gantry crane 11, the workpiece 6 is lifted. At the end of the workpiece 6 away from the positioning component 6-2, the counterweight 7 is hung with a wire rope and a matching hoist 8. Then, the positioning component 6-2 of the workpiece 6 is embedded into the middle position of the furnace front dust hood body 1 of the secondary dust removal furnace front dust hood assembly 5 using the feeding gantry crane 11. The positioning bolts 6-3 set on the upper part of the positioning component 6-2 are tightened to fix the secondary dust removal furnace front dust hood assembly 5 to the workpiece 6 firmly, so that it does not shake during the lifting process. Use the feeding straddle crane 11 to lift the workpiece 6, so that the dust removal hood assembly 5 and the counterweight 7 of the secondary dust removal furnace are lifted off the ground at the same time. If the dust removal hood assembly 5 and the counterweight 7 are not lifted off at the same time, the wire rope and the hoist of the matching hoist 8 can be adjusted to ensure that the two can be lifted off the ground at the same time, thereby ensuring the balance of the dust removal hood assembly 5 of the secondary dust removal furnace. At the same time, the temporary supports 13 on the left and right wind deflectors 2 are removed.

[0071] It should be noted that the positions of the positioning component 6-2 at one end of the lifting workpiece 6, the suspension points of the counterweight 7 on the other side, and the main lifting points of the feeding trolley 11 all require precise calculation. The design of the counterweight 7 needs to consider the overall weight of the secondary dust collector furnace front dust hood assembly 5 and the lifting workpiece 6. It is calculated and can be assembled from multiple small counterweights, which can be appropriately increased or decreased according to the balance during lifting. During lifting, the cleverly designed lifting workpiece 6 allows the dust collector furnace front dust hood body 1 to be positioned above the lifting workpiece 6, thereby reducing the lifting height requirement of the feeding trolley 5 and effectively solving the lifting height limitation when using the feeding trolley 11 to lift the secondary dust collector furnace front dust hood assembly 5 as a whole.

[0072] In addition, the temporary support 13 is made of 300*300 H-beams; before using the feeding trolley 11 to transfer the secondary dust removal furnace front dust removal hood assembly 5, the temporary support 13 must be removed, otherwise removing the temporary support 13 after the secondary dust removal furnace front dust removal hood assembly 5 is in place will be a high-altitude operation.

[0073] 5.3 Installation of the dust collector hood assembly 5 in front of the secondary dust collector furnace;

[0074] like Figure 7As shown, the secondary dust removal furnace front dust hood assembly 5 is moved to the front of the installation position using the feeding trolley 11. The secondary dust removal furnace front dust hood assembly 5 is then slowly moved towards the installation position in front of the furnace. After reaching the temporary cantilever support 10, the wire rope and traction hoist 14 are hung on the side wall of the secondary dust removal furnace front dust hood assembly 5. The wire rope is then slightly stressed by tightening the traction hoist 14 to secure the secondary dust removal furnace front dust hood assembly 5. At the same time, the counterweight 7 is slowly lowered onto the furnace front platform 15 by loosening the wire rope and matching hoist 8 at one end of the hoisting workpiece 6, and then removed. Simultaneously, the positioning bolts 6-3 on the upper part of the positioning component 6-2 are loosened to separate the hoisting workpiece 6 from the dust hood body 1 of the secondary dust removal furnace front dust hood assembly 5. The hoisting workpiece 6 is then lowered back onto the furnace front platform 15 using the feeding trolley 11.

[0075] Then, by tightening the wire rope and traction hoist 14 installed on the dust removal hood assembly 5 in front of the secondary dust removal furnace, the dust removal hood assembly 5 in front of the secondary dust removal furnace is slowly moved towards the side of the crane beam of the feeding span. After reaching the installation position, the dust removal hood assembly 5 in front of the secondary dust removal furnace is firmly welded to the dust removal hood support structure 9; and the wire rope and traction hoist 14 are removed.

[0076] 6. Remove the temporary cantilever supports;

[0077] Remove the temporary cantilever support 10 to create conditions for the subsequent installation of the furnace front fire baffle.

[0078] 7. Install the dust removal hood curtain 3 below the main body 1 of the furnace front dust removal hood (e.g., Figure 1 The dust cover can be installed in one step (as shown in the image).

[0079] The installation method of this invention can save the use of large lifting equipment, improve labor efficiency and reduce labor intensity, avoid or reduce the dangers of working at height, assemble on the ground, is convenient and reliable, helps to improve welding quality, and realizes a simple and convenient installation of the dust removal hood in front of the secondary dust removal furnace.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for combining and installing a dust collector hood in front of a secondary dust collector in steelmaking furnace, characterized in that: Step 1: Preparation; 1.1 The roof system, the material feeding span crane beam system, and the dust hood support structure located in the dust hood installation area have been installed and accepted to meet the conditions for dust hood installation; 1.2 Dust collection hoods, refractory castables, and related construction equipment have been delivered to the site; Step 2: Fabricate the hoisting workpiece (6); The hoisting workpiece (6) includes a main structure (6-1) and positioning components (6-2). The main structure (6-1) consists of two longitudinally arranged main beams and three transversely arranged connecting beams. Each main beam has two positioning components (6-2) at one end, and the positioning components (6-2) have positioning bolts (6-3) on the upper part. Step 3: Install temporary cantilever supports (10) on the dust hood support structure (9) in advance; the temporary cantilever supports (10) are made of H-beams and are processed into a 45° angled structure. After being installed and welded with the columns of the dust hood support structure (9), they form a triangular structure and are used to support and place the dust hood assembly (5) in front of the secondary dust removal furnace. Step 4: Assemble the dust collector hood assembly (5) in front of the secondary dust collector furnace. The assembly method is as follows: assemble the wind baffles (2) on the left and right sides onto the dust collector hood body (1) in front of the furnace, set the asbestos rope between the two flange surfaces, and then spray the refractory castable (4) onto the dust collector hood body (1) to assemble the dust collector hood assembly (5). Step 5: Use the hoisting workpiece (6) to complete the hoisting of the dust removal hood assembly (5) in front of the secondary dust removal furnace; In step five, the hoisting method for the dust collector hood assembly (5) is as follows: 5.1 Turning over the dust collector hood assembly (5) in front of the secondary dust collector furnace The upper part of the dust hood assembly (5) in front of the secondary dust collector is hung on the hook of the feeding trolley (11) using a steel wire rope, and the lower part of the dust hood assembly (5) in front of the secondary dust collector is hung on the hook of the truck crane (12) using a steel wire rope. Through the cooperation of the main lifting point feeding trolley (11) and the auxiliary lifting point truck crane (12), the dust hood assembly (5) in front of the secondary dust collector, which is in a horizontal state, is gradually transformed into a vertical state and falls back to the ground. Temporary supports (13) are set on both sides of the baffle plate (2) for support. 5.

2. Install and use the hoisted workpiece (6) The workpiece (6) is lifted using a feeding trolley (11). A dust cover assembly (5) is engaged between the positioning parts (6-2) at one end of the workpiece (6). A counterweight (7) is installed on the other end of the workpiece (6) away from the positioning parts (6-2) via a wire rope and a matching hoist (8). The lifting position and the weight of the counterweight (7) are adjusted to ensure that the dust cover assembly (5) and the counterweight (7) can leave the ground at the same time. Then the temporary supports (13) of the wind deflectors (2) on both sides are removed. 5.3 Installation of the dust collector hood assembly (5) in front of the secondary dust collector furnace Using the feeding trolley (11), the dust hood assembly (5) in front of the secondary dust collector is moved to the front of the installation position, and then moved towards the installation position in front of the furnace. After reaching the temporary cantilever support (10), the wire rope and traction hoist (14) are hung on the side wall of the dust hood assembly (5) in front of the secondary dust collector, and the wire rope is brought into a state of tension by tightening the traction hoist. ) Securely fix; at the same time, by loosening the matching hoist at one end of the hoisting workpiece (6), the counterweight (7) is slowly lowered onto the furnace front platform (15), and the counterweight (7) is removed; loosen the positioning bolts (6-3) set on the upper part of the positioning component (6-2), separate the hoisting workpiece (6) from the furnace front dust hood body (1) of the secondary dust removal furnace front dust hood assembly (5), and let the hoisting workpiece (6) fall back onto the furnace front platform (15) by feeding the cross-carriage (11); Finally, by tightening the traction hoist on the dust removal hood assembly (5) set in front of the secondary dust removal furnace, the dust removal hood assembly (5) in front of the secondary dust removal furnace is moved to the side of the feeding span crane beam. After reaching the installation position, the dust removal hood assembly (5) in front of the secondary dust removal furnace is welded firmly to the dust removal hood support structure (9); and the wire rope and traction hoist (14) are removed. Step 6: Remove the temporary cantilever support (10); Step 7: Install the dust removal hood curtain (3) below the main body (1) of the dust removal hood in front of the furnace.

2. The method for combining and installing a dust collector hood in front of a secondary dust collector in steelmaking furnace according to claim 1, characterized in that: In step three, the temporary cantilever support (10) and the dust cover support structure (9) are at the same elevation, and both the top of the temporary cantilever support (10) and the top of the dust cover support structure (9) are coated with lubricating oil.

3. The method for combining and installing a dust collector hood in front of a secondary dust collector in steelmaking furnace according to claim 2, characterized in that: The size design of the temporary cantilever support (10) must meet the lifting limit requirements of the charging trolley (11) in the furnace front direction to avoid being unable to lift, and also ensure that the size of the temporary cantilever support (10) is larger than the dust removal hood body (1).

4. The method for combining and installing a dust collector hood in front of a secondary dust collector in steelmaking furnace according to claim 2, characterized in that: The hoisting workpiece (6) is made of H-beams.

5. The method for combining and installing a dust collector hood in front of a secondary dust collector in steelmaking furnace according to claim 2, characterized in that: The counterweight (7) is assembled from multiple counterweights, and can be appropriately increased or decreased according to the balance state during hoisting.

6. The method for combining and installing a dust collector hood in front of a secondary dust collector in steelmaking furnace according to claim 2, characterized in that: The temporary support (13) is made of H-beams and is removed before the dust hood assembly (5) is transferred to the secondary dust removal furnace by the feeding trolley.

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