Large flue fast switching device
By designing a fast switching device for large flue and using components such as square cavity shell and movable cover, the sealing and operational problems of existing large flue switching devices under high temperature and high corrosion conditions are solved, and the rapid, safe and efficient switching of the flue is achieved, reducing costs and failure rates.
Patent Information
- Application Number
- CN202421098231.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-20
AI Technical Summary
The existing large flue switching devices have problems such as scaling, deformation and rust corrosion under high temperature, high corrosion and high negative pressure, which leads to difficulties in operation, poor sealing, high cost, unsatisfactory service life, which affects production safety.
A large flue rapid switching device is designed, adopting a square cavity shell structure, and quickly sealing and switching is achieved through components such as movable upper and lower cover plates, compression bolts and support positioning rods to avoid long-term erosion, wear, corrosion and scaling of the sealing plate in the flue.
It realizes fast and efficient switching of flue, reduces project volume and downtime, and shortens from 2 to 3 days to 2 to 3 hours, improves safety and sealing, and reduces failure rate and cost.
Smart Images
Figure CN222559222U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of industrial flue gas purification, and in particular relates to a large flue fast switching device. Background Art
[0002] Flue switching valves are commonly used equipment in industrial flue gas purification systems. They can be selected according to different usage occasions and requirements. However, there are still many difficulties and problems in selection and use for some special working conditions and occasions with specific requirements.
[0003] Sintering is an important process in the steel industry. The flue gas from a sintering machine has complex characteristics such as large flue gas volume, high temperature, high corrosion, easy condensation, high negative pressure, and large fluctuations in operating conditions. The flue gas conditions are extremely harsh, and the diameter of the large flue can reach 5~6m. It is extremely difficult to select valves that meet such operating conditions and specifications.
[0004] On the one hand, the valve plate and valve seat of conventional valves are in the flue for a long time, which is prone to scaling (tumor), deformation, jamming, rust and corrosion, making the valve difficult to operate, not fully closed, poor air tightness, and even failure quickly; on the other hand, large-caliber and highly tight valves that can meet such flue gas conditions are expensive, costing millions of yuan per set, and they also have many failures and less than ideal service life, which puts a heavy burden on enterprises. In actual production, the company usually shuts down to cut the flue that needs to be blocked and opened, and switches the flue by welding and cutting off the blind plates of the flue that needs to be blocked and opened.
[0005] This is the most primitive switching method, which has large engineering workload and long cycle, usually requiring 2 to 3 days of downtime, seriously affecting production; at the same time, there are many problems such as high-altitude operations, time-consuming and labor-intensive, and poor safety. Utility Model Content
[0006] In view of the defects in the prior art, the utility model provides a large flue fast switching device and method, which realizes fast and efficient flue switching, greatly improves safety and reduces costs.
[0007] The technical solution of the utility model is: a large flue fast switching device, including a shell, the shell is welded into a square cavity component by a front plate, a rear plate, a side plate, an upper cover plate flange and a lower cover plate flange; a movable upper cover plate is arranged on the upper part of the upper cover plate flange, and a movable lower cover plate is arranged on the lower part of the lower cover plate flange; the front plate and the rear plate are perforated plates, and the shell is connected to the process large flue through a flue connecting pipe; a sealing plate is arranged in the square cavity, and the sealing plate is a movable plate, which is welded by a sealing blind plate, a lifting ear and a reinforcing rib; the lifting ear is welded to the top of the sealing blind plate; the reinforcing rib is arranged on one side of the sealing blind plate and is intermittently welded into one; a supporting positioning rod is arranged at the bottom of the square cavity, the supporting positioning rod passes through the front plate and the rear plate, and is sealed and welded with the front plate and the rear plate; a clamping bolt is installed on the rear plate.
[0008] According to the embodiment of the utility model, the square cavity structure of the shell has an outer dimension that is larger than the outer diameter of the flue connecting pipe and has a thickness of 150-350 mm; the specific specifications and dimensions are designed as required.
[0009] According to the embodiment of the utility model, the upper cover plate and the lower cover plate of the shell are both movable cover plates, which are sealed and connected to the upper cover plate flange and the lower cover plate flange of the shell by bolts, hinges, buckles or a combination of installation methods.
[0010] According to the embodiment of the utility model, the number of the clamping bolts is ≥4, the specification is ≥M20mm, and the length is not less than the width of the side plate; the installation position of the clamping bolts is evenly distributed on the circumference of a circle with the center of the rear plate as the center and a diameter greater than the outer diameter of the flue connecting pipe and less than the diameter of the inscribed circle of the blocking plate; the installation is carried out by opening an internal threaded hole matching the clamping bolt on the rear plate or welding a nut; the specific number, specification, size, installation position and method are designed as required.
[0011] According to an embodiment of the utility model, the support positioning rod is installed at a position between the bottom of the flue connecting pipe and the flange of the lower cover plate; the support positioning rod is made of round steel or round tube, with a diameter of ≥30 mm, a length greater than the width of the side plate (13), a number of ≥2, and evenly distributed; the specific number, specifications, size, installation position and method are designed according to needs.
[0012] According to the embodiment of the utility model, the diameter and plate thickness of the flue connecting pipe are equivalent to those of the large process flue. The flue connecting pipe is inserted into the front plate and the rear plate by 20~60mm, and the end that is sealed with the sealing plate is rounded or equipped with a U-shaped rubber sealing material.
[0013] According to an embodiment of the utility model, the outer dimensions of the blocking plate are larger than the outer diameter of the flue connecting pipe and smaller than the inner dimensions of the square cavity of the shell; the specific specifications and dimensions are designed as needed.
[0014] According to an embodiment of the utility model, the lifting lug is connected to a lifting device, and the lifting device is an electric hoist, a hand hoist, or a crane.
[0015] A large flue quick switching method, the large flue quick switching device is installed on the process large flue, when the system fan is shut down, the upper cover plate and the lower cover plate are opened to first clear the dust inside and at the bottom of the shell, and then the blocking plate is hoisted into the square cavity of the shell, placed on the supporting positioning rod, and pushed in with the clamping bolt (4) and pressed against the sealing end surface of the flue connecting pipe to achieve the blocking of the flue; after the blocking plate is hoisted out of the shell, the upper cover plate and the lower cover plate are closed to restore the flue to the open state, thereby achieving the fast and reliable switching of the flue.
[0016] The main functions and features of the utility model are: the utility model has the function and feature of removing dust accumulation, and the dust accumulation inside the shell can be removed by opening the lower cover plate, effectively avoiding the problem that the sealing plate is not closed properly due to dust accumulation; the utility model has the function and feature of tightening and sealing, and the sealing plate and the flue connecting pipe are tightly fitted through the pushing and tightening of the tightening bolts to ensure the tightness of the seal; the utility model has the function and feature of lifting the external sealing plate. When the flue needs to be open, the sealing plate can be lifted and lifted out of the flue through the lifting device, which can effectively avoid the sealing plate from being eroded, worn, corroded and scaled in the flue for a long time, thereby keeping the surface of the sealing plate clean and ensuring the tightness of the seal.
[0017] The beneficial technical effect of the utility model is as follows: the utility model adopts a set of rapid plugging and switching devices installed on the large process flue, and realizes rapid plugging and switching of the flue by bolting and pressing or hoisting an external plugging plate. The operation time can be greatly compressed from 2 to 3 days of traditional high-altitude cutting of the large flue and welding of the plugging plate to 2 to 3 hours, and the safety is greatly improved; at the same time, it can solve the problems of large-diameter flue sealing valves prone to scaling, tumor growth and jamming, inadequate closure, poor sealing, difficult inspection and maintenance and high price; the utility model has the outstanding characteristics of simple and efficient operation and maintenance, high sealing and safety, low failure rate and cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is the main view of the structure of the large flue quick switching device.
[0019] Figure 2 yes Figure 1 Left view of .
[0020] Figure 3 It is the main view of the shell structure.
[0021] Figure 4 yes Figure 3 Left view of .
[0022] Figure 5 It is a schematic diagram of the blocking plate structure.
[0023] Figure 6 yes Figure 1 A partial enlarged view of point Ⅰ in the middle.
[0024] In the figure: 1-shell, 11-upper cover, 12-lower cover, 13-front plate, 14-rear plate, 15-side plate, 16-upper cover flange, 17-lower cover flange; 2-smoke duct connecting pipe; 3-sealing plate, 31-sealing blind plate, 32-lifting ear, 33-reinforcement rib; 4-tightening bolt; 5-support positioning rod; 6-lifting device. DETAILED DESCRIPTION
[0025] In conjunction with the accompanying drawings, the specific implementation methods of the utility model are further described by taking the process large flue outer diameter of 4600mm as an example. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the protection scope of the utility model. In addition, it should be understood that after reading the content of the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the claims attached to the application.
[0026] like Figures 1 to 6 As shown, a large flue fast switching device comprises: a housing 1, a flue connecting pipe 2, a blocking plate 3, a clamping bolt 4, a supporting positioning rod 5 and a lifting device 6 and other components.
[0027] The shell 1 is composed of an upper cover plate 11, a lower cover plate 12, a front plate 13, a rear plate 14, a side plate 15, an upper cover plate flange 16 and a lower cover plate flange 17. The shell 1 has a size of 5400mm (W1) × 5400mm (H1) and a thickness of 280mm (L1). The front plate 13 and the rear plate 14 are perforated plates with a thickness of 10mm. The holes are centered on the center of the plate and have a diameter of 4610mm. They are respectively welded to the flue connecting pipes 2 at both ends. The rear plate 14 is centered on the center of the plate and has a diameter of 5000mm (D1). , 8 bolt holes are evenly distributed, and nuts are concentrically welded outside the holes (placed outside the cavity), the bolt hole diameter is 54mm, the nut specification is M50, and the number is 8; there are 2 side panels 15, the thickness is 10mm, and both need to be sealed and welded with the front panel 13 and the rear panel 14; the upper cover flange 16 and the lower cover flange 17 are arranged on the top and bottom of the shell 1 and are welded to the front panel 13, the rear panel 14 and the side panel 15 as a whole; the upper cover 11 and the lower cover 12 are both movable cover panels, which are sealed and connected to the upper cover flange 16 and the lower cover flange 17 respectively by a combination of hinges and bolts.
[0028] The blocking plate 3 is composed of a blocking blind plate 31, a lifting ear 32, and a reinforcing rib 33; the blocking blind plate 31 is a square steel plate with a specification size of 5250mm (W2) × 5150mm (H2) and a plate thickness of 8mm; the lifting ears 32 are symmetrically welded on both sides of the top of the blocking blind plate 31, and there are two of them; the reinforcing rib 33 is arranged on one side of the blocking blind plate 31 and is intermittently welded into one body, and its arrangement range should be controlled within a circle with the center of the blind plate as the center and a diameter of 4400mm (D2); when blocking is implemented, the smooth surface of the blocking plate 3 without the reinforcing rib faces the smoke contact surface.
[0029] The supporting positioning rod 5 plays a role in positioning and supporting the sealing plate 3. It is made of round steel with a diameter of 50 mm and a length of 300 mm. It is placed at the bottom of the shell 1. The center of the round steel is 100 mm away from the bottom surface of the lower cover flange 17. There are 5 supporting positioning rods 5, which are evenly spaced and penetrate the front plate 13 and the rear plate 14 and are firmly and tightly welded thereto.
[0030] The clamping bolts 4 are mounted on nuts that are matched and welded around the rear plate 14. The specification is M50, the length is 290 mm, and the number is 8. By tightening the sealing plate (3) with the clamping bolts 4, a tight seal between the sealing plate 3 and the end face of the flue connecting pipe 2 can be achieved.
[0031] The flue connecting pipe 2 has two sections, and its material thickness and pipe diameter are consistent with those of the large process flue, with an outer diameter of 4600mm (D0), a plate thickness of 12mm, and a single section length of 800mm. One end welded to the large process flue is beveled, and the other end needs to extend into the inner cavity of the shell 1 by 50mm, and the end contacting and sealing with the sealing plate 3 needs to be rounded, with an arc radius of R=6mm, to form a line-surface sealing pair with the sealing plate 3 and improve the tightness of the seal.
[0032] The lifting device 6 of this embodiment adopts a crane, which is used to lift the blocking plate 3 and place it in the inner cavity or outside of the shell 1 as needed, so as to achieve rapid switching of the flue.
[0033] The operating method of this embodiment is as follows: when the flue needs to be blocked and switched, first shut down the system fan, open the upper cover plate 11 and the lower cover plate 12 of the shell 1, first clean the dust inside and at the bottom of the shell 1, and focus on removing the dust on the supporting positioning rod 5 and the dust and scaling that may affect the tight sealing of the blocking plate 3; then use the lifting device 6 to slowly lift the blocking plate 3 from top to bottom into the shell 1, and place it on the supporting positioning rod 5, and the blocking plate 3 should be as close to the sealing end face of the flue connecting pipe 2 as possible; tighten the clamping bolt 4 on the rear plate 14 and push the blocking plate 3 in, so that it is tightly fitted and pressed against the sealing end face of the flue connecting pipe 2, thereby achieving the blocking of the flue.
[0034] When the flue needs to be opened and switched, the system fan should be kept in the off state first, the clamping bolt 4 should be loosened, and the blocking plate 5 should be completely lifted out of the shell 1 using the lifting device 6 and placed in a safe area for proper storage; the upper cover plate 11 and the lower cover plate 12 of the shell 1 should be closed and compressed to realize the opening of the flue.
Claims
1. A large flue quick switching device, comprising a housing (1), characterized in that The shell (1) is welded into a square cavity assembly by a front plate (13), a rear plate (14), a side plate (15), an upper cover plate flange (16) and a lower cover plate flange (17); a movable upper cover plate (11) is arranged on the upper part of the upper cover plate flange (16), and a movable lower cover plate (12) is arranged on the lower part of the lower cover plate flange (17); the front plate (13) and the rear plate (14) are perforated plate members, and the shell (1) is connected to the process flue through a flue connecting pipe (2); a sealing plate (3) is arranged in the square cavity, and the sealing plate (3) is arranged in the process flue The plate (3) is a movable plate component, which is welded together by a blocking blind plate (31), a lifting ear (32), and a reinforcing rib (33); the lifting ear (32) is welded to the top of the blocking blind plate (31); the reinforcing rib (33) is arranged on one side of the blocking blind plate (31) and is intermittently welded into one piece; a supporting positioning rod (5) is arranged at the bottom of the square cavity, the supporting positioning rod (5) passes through the front plate (13) and the rear plate (14), and is sealed and welded to the front plate (13) and the rear plate (14); a clamping bolt (4) is installed on the rear plate (14).
2. A large flue fast switching device according to claim 1, characterized in that The square cavity structure of the shell (1) has an outer dimension that is larger than the outer diameter of the flue connecting pipe (2) and has a thickness of 150-350 mm.
3. A large flue fast switching device according to claim 1, characterized in that The upper cover plate (11) and the lower cover plate (12) of the housing (1) are both movable cover plates, and are sealedly connected to the upper cover plate flange (16) and the lower cover plate flange (17) of the housing (1) by bolts, hinges, buckles or a combination of mounting methods.
4. A large flue fast switching device according to claim 1, characterized in that The number of the clamping bolts (4) is ≥4, the specification is ≥M20mm, and the length is not less than the width of the side plate (15); the installation position of the clamping bolts (4) is evenly distributed on the circumference of a circle with the center of the rear plate (14) as the center and a diameter greater than the outer diameter of the flue connecting pipe (2) and less than the diameter of the inscribed circle of the sealing plate (3); and the clamping bolts (4) are installed by opening an internal threaded hole matching the clamping bolts (4) on the rear plate (14) or by welding nuts.
5. A large flue fast switching device according to claim 1, characterized in that The support positioning rod (5) is installed at a position between the bottom of the flue connecting pipe (2) and the lower cover plate flange (17); the support positioning rod (5) is made of round steel or round tube, with a diameter of ≥30 mm, a length greater than the width of the side plate (15), a number of ≥2, and evenly spaced.
6. A large flue fast switching device according to claim 1, characterized in that The diameter and thickness of the flue connecting pipe (2) are the same as those of the large process flue. The flue connecting pipe (2) is inserted into the front plate (13) and the rear plate (14) by 20 to 60 mm, and one end that is sealed with the sealing plate (3) is rounded or equipped with a U-shaped rubber sealing material.
7. A large flue fast switching device according to claim 1, characterized in that The outer dimensions of the blocking plate (3) are larger than the outer diameter of the flue connecting pipe (2) and smaller than the inner dimensions of the square cavity of the shell (1).
8. A large flue fast switching device according to claim 1, characterized in that The lifting lug (32) is connected to a lifting device (6), and the lifting device (6) is an electric hoist, a hand hoist, or a crane.