Construction method for replacing flue damper of atmospheric and vacuum heating furnace

Abstract

The application discloses a kind of atmospheric and vacuum heating furnace flue baffle replacement construction methods, in the top steel structure column top surface position of heating furnace fixed flue reinforcement support tool, one end of hand-operated hoist is hung on the lifting lug of the flue reinforcement support tool, the other end is connected to the original flue baffle outer wall, hand-operated hoist and crane cooperate to move the original flue baffle from the bottom of flue laterally, then the original flue baffle is sent to the ground by crane.By crane, the new flue baffle is lifted to the installation height, the hand-operated hoist is connected to the new flue baffle outer wall, and the new flue baffle is installed into the bottom of the flue by the cooperation of the hand-operated hoist and the crane.The application uses flue reinforcement support tool, and after the flue is reinforced and fixed, the hand-operated hoist is used to cooperate with the ground crane to replace the flue baffle, which saves a lot of time and machinery required for the installation and removal of the heating furnace flue and the flue baffle, reduces the high-altitude lifting operation, ensures the overall stability of the construction flue gas system, and ensures the safety of the flue baffle replacement construction.

Description

Technical Field

[0001] This invention relates to the field of maintenance technology for heating furnaces in atmospheric and vacuum distillation units of oil refining, specifically to a method for replacing the flue damper of an atmospheric and vacuum distillation heating furnace. Background Technology

[0002] The flue dampers of the atmospheric and vacuum furnaces (hereinafter collectively referred to as heating furnaces) in the atmospheric and vacuum distillation unit are important regulating and actuating mechanisms of the flue gas system. Good operation ensures the stability of the flue gas outlet pressure, and is used to regulate flue gas resistance and negative pressure. It can also control the flame length, thereby achieving the purpose of controlling the uniform distribution of temperature.

[0003] The environment in which the flue gas damper of the heating furnace operates is harsh. During combustion, the flue gas contains acidic gases such as water vapor and sulfur dioxide, which easily condense at the damper, causing low-temperature dew point corrosion. Ash in the flue gas deposits on the damper, increasing rotational resistance. The high operating temperature of the flue gas causes high-temperature oxidation of the damper. After years of operation, the flue gas conditions can prevent the damper from rotating normally, and in severe cases, it may even become stuck and malfunction, losing its regulating function.

[0004] Replacement of the flue damper in the atmospheric and vacuum distillation furnace is a crucial part of the maintenance of the flue gas system. The conventional method for replacing the flue damper involves using a large crane to lift the flue and damper together, replacing the damper, and then hoisting the flue and damper back into place. This approach results in a large workload, a long construction period, and increased costs for maintenance projects. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a construction method for replacing the flue damper of an atmospheric and vacuum distillation furnace, so as to achieve the purpose of safe and smooth replacement of the flue damper under the condition of high-altitude hoisting.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for replacing the damper in the flue of an atmospheric and vacuum distillation furnace includes the following steps: Step 1: Fix the flue reinforcement support fixture to the top surface of the steel structure column at the top of the heating furnace. The top of the flue reinforcement support fixture is fixed to the outer wall of the flue, and multiple lifting lugs are provided on the reinforcement support fixture. Step 2: Attach one end of the hand-operated hoist to the lifting lug of the flue reinforcement support fixture, and connect the other end of the hand-operated hoist to the outer wall of the original flue baffle; connect the crane's sling to the outer wall of the original flue baffle; the hand-operated hoist and the crane work together to move the original flue baffle from the bottom of the flue to the side, and then the crane sends the original flue baffle to the ground, completing the removal of the original flue baffle; Step 3: The new flue damper is lifted to the installation height by a crane, and the hand chain hoist is connected to the outer wall of the new flue damper. The hand chain hoist and the crane work together to install the new flue damper into the bottom of the flue. Step 4: Remove the flue reinforcement support fixtures.

[0007] Furthermore, in step one, the flue reinforcement support fixture includes multiple support units, each of which includes a column and a horizontal brace; the bottom of the column is fixedly connected to the top surface of the steel structure column at the top of the heating furnace, and the lifting lug is set on the top of the column; the horizontal brace is fixed to the top of the column and one inner end of the horizontal brace is connected to the outer wall of the flue.

[0008] Furthermore, in step one, the supporting unit also includes a diagonal brace, one end of which is fixedly connected to the middle of the upper surface of the horizontal brace, and the other end of which is connected to the outer wall of the flue.

[0009] Furthermore, in step one, the supporting units are evenly distributed along the central circumference of the flue baffle on the top surface of the steel structure column at the top of the heating furnace.

[0010] Furthermore, in step two, the manual hoist is first pulled horizontally to the side of the original flue baffle. When one-third of the original flue baffle has been moved out of the flue, the crane sling begins to lift the original flue baffle. The manual hoist continues to slowly move the original flue baffle out until the flue baffle is completely and safely moved out. Then the crane sends the original flue baffle to the ground.

[0011] Furthermore, in step two, after the original flue baffle is removed, the flue and the sealing surface of the heating furnace outlet flange are cleaned, and the fastening bolts are cleaned, inspected, and lubricated.

[0012] Furthermore, in step three, when installing the new flue damper, first pull the hand chain hoist, and the crane will pull the new flue damper in. When the new flue damper has moved halfway into the flue, the crane will release the hook, and the hand chain hoist at different positions will be pulled as needed to slowly pull the new flue damper into place.

[0013] Furthermore, after the new flue damper is installed in place, the sealing gasket is installed, the fastening bolts are installed, and the bolts are tightened to complete the replacement of the new flue damper.

[0014] This invention employs flue reinforcement and support fixtures. After the flue is reinforced and fixed, a hand-operated hoist and a ground crane are used to replace the flue baffle. This saves a significant amount of time and machinery required for the installation and removal of the heating furnace flue and flue baffle, reduces high-altitude hoisting operations, ensures the overall stability of the construction flue gas system, and guarantees the safety of the flue baffle replacement construction.

[0015] Furthermore, the flue reinforcement support tooling provided by this invention can be reused, is flexible in use, and can be reused for the replacement of flue baffles of the same diameter and equivalent weight. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the reinforcement and support fixtures fixed to the top surface of the steel structure column at the top of the heating furnace; Figure 2 This is a schematic diagram of the supporting unit structure described in this invention; Figure 3 This is a schematic diagram showing the removal of the original flue damper; Figure 4 This is a schematic diagram of the installation of the new flue damper; Figure 5 This is a schematic diagram showing the new flue damper after it has been installed.

[0018] In the diagram, 1-steel structure column at the top of the heating furnace, 2-flue, 3-lifting lug, 4-support unit, 5-flue baffle, 6-hand chain hoist, 7-lifting sling; 401-column, 402-horizontal brace, 403-diagonal brace, 404-guard plate connecting plate. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the present invention will be further described clearly and completely below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0020] The present invention provides a typical embodiment of a method for replacing flue dampers in atmospheric and vacuum heating furnaces. The method uses flue reinforcement and support fixtures to reinforce and fix the flue. After the flue is reinforced and fixed, a hand-operated hoist and a ground crane are used to replace the flue dampers. This embodiment does not disassemble or assemble the flue, but only the flue dampers, thus reducing the need for high-altitude hoisting and achieving the goal of safe and smooth replacement of the flue dampers.

[0021] First, such as Figure 1 As shown, a flue reinforcement support fixture is fixed at the top surface of the steel structure column 1 at the top of the heating furnace. The top of the flue reinforcement support fixture is fixed to the outer wall of the flue 2, and multiple lifting lugs 3 are provided on the reinforcement support fixture.

[0022] The flue reinforcement and support fixture is fixed to the top surface of the steel structure column 1 at the top of the heating furnace. The weight of the flue 2 is transferred to the steel structure column 1 at the top of the heating furnace through the flue reinforcement and support fixture, which plays a supporting role.

[0023] The flue reinforcement support fixture includes multiple support units 4, such as... Figure 2 As shown, the supporting unit 4 includes a column 401 and a horizontal brace 402.

[0024] The column 401 of the supporting unit is fixed to the top surface of the steel structure column at the top of the heating furnace and is welded and fixedly connected. The column 401 forms a certain angle with the vertical direction.

[0025] Lifting lug 3 is installed at the top of column 401, perpendicular to the side of column 401, and welded to the column. Lifting lug 3 is used to hang the hand chain hoist 6, which is used to horizontally pull the flue baffle 5 to facilitate the removal and installation of the flue baffle.

[0026] The horizontal brace 402 of the supporting unit 4 is fixed to the top of the column 401 and welded to the column 401. The end face of the horizontal brace 402 is welded to the flue 2 to fix the protective plate connecting plate 404.

[0027] In a preferred embodiment, the supporting unit 4 further includes a diagonal brace 403, one end of which is fixedly connected to the middle of the upper surface of the horizontal brace 402, and the other end of which is connected to the outer wall of the flue 2.

[0028] The diagonal brace 403 is at a certain angle to the horizontal brace 402. The other end of the diagonal brace 403 is also provided with a protective plate connecting plate 404 between it and the flue 2, which is welded and fixed.

[0029] The aforementioned protective plate connecting plate 404 is arc-shaped, with its inner diameter matching the outer diameter of the flue cylinder to ensure a tight fit and welding fixation.

[0030] Each connection point is designed with a separate joint type, and a full welded joint type is adopted. The weld height is greater than or equal to the height of the thinnest part to ensure connection strength and guarantee construction safety.

[0031] In a preferred embodiment, the supporting unit 4 is evenly distributed around the center circumference of the flue baffle 5 on the top surface of the steel structure column 1 at the top of the heating furnace. The flue reinforcement support fixture acts on the flue 2 in multiple horizontal directions, playing a role in preventing tipping and ensuring the stability of the flue gas system, and ensuring the safety of the flue baffle 5 replacement operation.

[0032] The dimensions and quantity of the flue reinforcement support fixtures described above are based on the maximum weight of the installed flue 2 and flue baffle 5. The dimensions include the cross-sectional dimensions and height of each component of the support unit 4 of the reinforcement fixtures.

[0033] In a relatively specific embodiment, the flue reinforcement support fixture is made of H-beams. Each support unit 4 is independently welded and fixed to the steel structure column 1 at the top of the heating furnace to ensure that the stress performance of the flue 2 meets the stress requirements when the flue baffle 5 is replaced.

[0034] By using flue reinforcement and support fixtures, the overall stability of the flue is improved, eliminating the need for high-altitude disassembly and assembly work, reducing high-altitude hoisting work, and ensuring the safety of construction personnel during the operation.

[0035] like Figure 3 As shown, after the flue reinforcement support is installed in place, a hand-operated hoist 6 is hung on the lifting lug 3 of the support unit 4. The other end of the hand-operated hoist 6 is attached to the outer wall of the original flue baffle 5 via a steel wire rope. All mounting bolts on both sides of the original flue baffle 5, connecting it to the heating furnace outlet flange and the flue flange are removed. The crane's sling 7 is then attached to the outer wall of the original flue baffle 5. Initially, the sling is not under any stress.

[0036] like Figure 3 As shown, pull the hand-operated hoist 6 horizontally to pull the original flue baffle 5 towards the removal side. The original flue baffle 5 slowly moves towards the removal side, and the wire rope is slowly pulled up to pull the original flue baffle 5 out. When the original flue baffle 5 has moved out of the flue by one-third, the crane sling 7 begins to lift the original flue baffle 5, and the hand-operated hoist 6 continues to slowly move the original flue baffle 5 out until it is completely and safely removed. The crane sling 7 bears the entire weight of the original flue baffle 5, and the crane's safety boom lowers the original flue baffle 5 to the ground, completing the removal of the original flue baffle 5. Then, clean the flue and the sealing surface of the heating furnace outlet flange, tighten the bolts, clean and inspect them, and apply lubricating grease.

[0037] Then, as Figure 4 As shown, the new flue damper 5 is positioned according to the installation orientation on the ground. Using the four-track lifting method, the new flue damper 5 is hoisted to the installation height. The wire rope of the hand-operated hoist 6 on the support unit 4 is then attached to the new flue damper 5. The hand-operated hoist 6 is slowly pulled, and the crane slowly releases the wire rope to pull the new flue damper 5 in. When the new flue damper 5 has moved halfway into the flue 2, the crane releases the hook. As needed, the hand-operated hoist 6 is pulled at different positions to slowly pull the new flue damper 5 into place. The sealing gasket is installed, and the fastening bolts are tightened. The replacement of the new flue damper is complete (e.g., ...). Figure 5 (As shown).

[0038] Finally, as needed, remove each support unit of the flue reinforcement support fixture to facilitate the next replacement and reuse of the flue baffle.

[0039] The scope of protection claimed by this invention is not limited to the specific embodiments described above. For those skilled in the art, this invention can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for replacing the damper in the flue of an atmospheric and vacuum distillation furnace, characterized in that, Includes the following steps: Step 1: Fix the flue reinforcement support fixture to the top surface of the steel structure column at the top of the heating furnace. The top of the flue reinforcement support fixture is fixed to the outer wall of the flue, and the flue reinforcement support fixture is equipped with multiple lifting lugs. The flue reinforcement support fixture includes multiple support units, each of which includes a column and a horizontal brace; the bottom of the column is fixedly connected to the top surface of the steel structure column at the top of the heating furnace, and a lifting lug is set on the top of the column; the horizontal brace is fixed to the top of the column and one inner end of the horizontal brace is connected to the outer wall of the flue. The supporting unit also includes a diagonal brace, one end of which is fixedly connected to the middle of the upper surface of the horizontal brace, and the other end of which is connected to the outer wall of the flue; the supporting units are evenly distributed along the central circumference of the flue baffle on the top surface of the steel structure column at the top of the heating furnace. Step 2: Attach one end of the hand-operated hoist to the lifting lug of the flue reinforcement support fixture, and connect the other end of the hand-operated hoist to the outer wall of the original flue baffle; connect the crane's sling to the outer wall of the original flue baffle; the hand-operated hoist and the crane work together to move the original flue baffle from the bottom of the flue to the side, and then the crane sends the original flue baffle to the ground, completing the removal of the original flue baffle; First, pull the hand chain hoist horizontally to the side of the original flue baffle. When the original flue baffle is one-third of the way out of the flue, the crane sling begins to lift the original flue baffle. Then, continue to slowly move the original flue baffle out by hand chain hoist until the original flue baffle is completely and safely moved out. Then, the crane will send the original flue baffle to the ground. Step 3: The new flue damper is lifted to the installation height by a crane, and the hand chain hoist is connected to the outer wall of the new flue damper. The hand chain hoist and the crane work together to install the new flue damper into the bottom of the flue. When installing a new flue damper, first pull the chain hoist, and the crane will pull the new flue damper in. When the new flue damper is halfway into the flue, release the hook of the crane and pull the chain hoist at different positions as needed to slowly pull the new flue damper into place. After the new flue damper is in place, install the sealing gasket, install the fastening bolts, tighten the bolts, and the replacement of the new flue damper is complete. Step 4: Remove the flue reinforcement support fixtures.

2. The construction method for replacing the flue damper of the atmospheric and vacuum distillation furnace according to claim 1, characterized in that: In step two, after the original flue baffle is removed, clean the flue and the sealing surface of the heating furnace outlet flange, clean and check the fastening bolts and apply lubricating grease.

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