Coupling reboiler with self-cleaning function

Abstract

The utility model relates to the technical field of chemical equipment, and specifically relates to a coupling reboiler with self-cleaning function, which comprises a kettle body and vertical partition plates, the kettle body is divided into water inlet area, heat exchange area and water outlet area through the vertical partition plates, heat exchange pipes are arranged in the kettle body, the two ends of the heat exchange pipes respectively pass through the corresponding vertical partition plates and are communicated with the corresponding water inlet area and water outlet area, the outer end of the moving shaft extends into the corresponding screw hole and can be driven to move horizontally through the stretching mechanism, and the water outlet area is provided with a blow-off pipe controlled by a valve. The use of the present application can separate the kettle body into the upper water inlet area, the lower water inlet area, the upper water outlet area, the lower water outlet area and the heat exchange area through the vertical partition plates and the horizontal partition plates, so that the internal heat exchange pipes can work half and be cleaned half at the required time according to the three-way valve, thereby ensuring that the cleaning of the heat exchange pipes can be realized without stopping work, improving the work efficiency and saving a large amount of time.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically a coupled reboiler with self-cleaning function. Background Technology

[0002] Reboilers play a crucial role in numerous industrial production processes, including chemical engineering, petroleum refining, pharmaceuticals, and food processing. They are core heat source components in equipment such as distillation columns and evaporators, functioning to heat the bottom liquid of the column through an external heat source (such as steam), causing partial vaporization and providing the vapor reflux required for the distillation process. The performance of the reboiler directly affects the efficiency, energy consumption, and operational stability of the entire separation process.

[0003] Coupled reboilers (usually referring to thermosiphon reboilers) are widely used due to their advantages such as compact structure, high heat transfer efficiency, and relatively low energy consumption. These reboilers are typically installed directly on the bottom of the column or the side wall of the column. Their core heat transfer element—the heat exchange tube bundle (usually U-shaped tubes, straight tubes, or spiral tubes)—is immersed in the liquid in the bottom. The heat medium (such as steam) flows inside the heat exchange tubes and releases heat, which heats the liquid in the bottom outside the tubes through the tube walls.

[0004] However, existing coupled reboilers generally face a thorny common technical problem in long-term actual operation: scaling and difficulty in cleaning the inside of the heat exchange tubes. Specifically, this manifests in: Scale buildup inside heat exchanger tubes: As the core interface for heat exchange, the heating medium flowing inside the tubes (especially steam condensate or certain process hot fluids) is highly susceptible to precipitation and deposition of dissolved minerals (such as calcium and magnesium salts) under high-temperature conditions, forming a hard scale layer. In addition, some process fluids may also form scale on the inner wall of the tubes due to thermal polymerization, coking, or other reasons. Over time, this scale layer gradually thickens.

[0005] Scale buildup acts as an insulation layer, hindering the effective transfer of heat from the internal heat medium to the external vessel liquid. This not only leads to energy waste and increased energy consumption, but more seriously, it causes insufficient heat exchange capacity of the reboiler, a decrease in the vaporization rate of the vessel liquid, and consequently affects the operational stability and product yield / quality of main equipment such as distillation columns. When scale buildup is severe, it can even cause localized blockages in the pipeline, posing safety hazards. Therefore, cleaning is necessary. However, existing cleaning methods typically require completely disassembling the entire heat exchanger tube bundle assembly from the coupled vessel body. This process involves disconnecting flanges or interfaces, hoisting and removing large tube bundles, making the operation extremely cumbersome, consuming a significant amount of valuable production time, resulting in long equipment downtime and severe losses in production efficiency. Utility Model Content

[0006] This invention provides a coupled reboiler with a self-cleaning function to overcome the deficiencies in the prior art.

[0007] This utility model is achieved through the following technical solution: A self-cleaning coupled reboiler includes a horizontally placed vessel body and vertical partitions fixedly installed on both sides of the vessel body. The vessel body is divided into an inlet zone, a heat exchange zone, and an outlet zone by the vertical partitions. Multiple heat exchange tubes are arranged parallel to each other and fixedly inside the vessel body. The two ends of each heat exchange tube pass through the corresponding vertical partitions and communicate with the corresponding inlet zone and outlet zone. The inlet zone and outlet zone are respectively connected to an inlet main pipe and an outlet main pipe. The bottom and top of the heat exchange zone are respectively connected to an inlet pipe and an outlet pipe. A movable shaft is coaxially installed inside each heat exchange tube. Several annular scrapers are fixedly sleeved on the movable shaft along its length. A screw hole is opened on the side of the vessel body in the heat exchange zone. The screw hole is sealed by a screw cap connected by a thread. The outer end of the movable shaft extends into the corresponding screw hole and can be moved laterally by a tensioning mechanism. A drain pipe controlled by a valve is provided in the outlet zone.

[0008] In use, a liquid or gas enters the inlet area through the inlet main pipe, enters the heat exchange tube through the inlet area, enters the outlet area through the heat exchange tube, and enters the outlet main pipe from the outlet area. Meanwhile, another heat exchange liquid flows in the heat exchange area through the inlet and outlet pipes to achieve heat exchange.

[0009] After a period of use, both liquids stop flowing into the system. Then, the screw cap is opened, and the moving shaft is pulled by the tensioning mechanism. The moving shaft drives the scraper to move inside the heat exchange tube, thereby scraping off the dirt on the inner wall of the heat exchange tube and cleaning it. The dirt is scraped into the outlet area, and then the drain pipe is opened to discharge the dirt. This eliminates the need to disassemble the heat exchange tube for cleaning, improving efficiency and saving a lot of valuable time.

[0010] Preferably, both the inlet and outlet water areas are fixedly equipped with transverse partitions, which divide the inlet and outlet water areas into an upper inlet water area, a lower inlet water area, an upper outlet water area, and a lower outlet water area. The upper and lower inlet water areas are each connected to a corresponding inlet branch pipe. The upper and lower outlet water areas are each connected to a corresponding outlet branch pipe. The inlet and outlet branch pipes are connected to the corresponding main inlet and main outlet water pipes through three-way valves. The sewage pipes are respectively installed at the lower part of the upper and lower outlet water areas. The horizontal baffle can separate the upper water inlet area, the lower water inlet area, the upper water outlet area, and the lower water outlet area. The upper and lower water inlet areas and the upper and lower water outlet areas work simultaneously. When it is necessary to clean the upper or lower heat exchange tubes, the three-way valve can be controlled to allow water to enter the water inlet branch pipe through the main water inlet pipe, and then enter the corresponding upper or lower water inlet area, while the other water inlet area does not receive water. This achieves cleaning of the non-water-receiving area, ensuring uninterrupted operation and further improving efficiency.

[0011] Preferably, the stretching mechanism includes an electric telescopic rod that can move up and down and be fixed by a lifting device. The movable end of the electric telescopic rod is fixedly connected to a U-shaped plate with a U-shaped opening facing the vessel body. Dovetail grooves are provided on the top and bottom surfaces of the transverse part of the U-shaped plate. Dovetail blocks are slidably fitted in the dovetail grooves. A connecting rod is fixedly connected between two dovetail blocks. The connecting rod is rotatably connected to a round rod through a bearing. The outer end of the round rod is provided with an external thread. A connecting plate is vertically connected to the outer end of the moving shaft. The four corners of the connecting plate are in contact with the screw holes and cannot rotate within the screw holes. A blind hole is provided on the side of the connecting plate facing the round rod, which is in contact with the thread of the outer end of the round rod. The rotating rod can be rotated into the blind hole, achieving a fixed connection between the rod and the connecting rod, and thus a fixed connection with the moving shaft. When the electric telescopic rod retracts, it drives the U-shaped plate to move, which in turn drives the rod to move, thus moving the moving shaft. The U-shaped plate is equipped with a dovetail groove and a dovetail block, which allows the rod to be threaded into the connecting plate. When the U-shaped plate moves, the dovetail block first moves to the edge of the dovetail groove before moving itself. The electric telescopic rod, which can move up and down, can work in both the upper and lower areas, thus reducing costs.

[0012] Preferably, the scraper is fixedly connected to a connecting block by a connecting rod, and the moving shaft passes through the connecting block and is fixedly connected to the connecting block. The left and right sides of the scraper are provided with flared mouths that are wider on the outside and narrower on the inside. The flared mouths on both sides of the scraper can not only facilitate scraping the inner wall of the heat exchange tube, but also facilitate the flow of water in the flared mouths.

[0013] Preferably, the lifting device includes a fixed vertical plate with a slide rail. A movable block is slidably fitted onto the slide rail. The movable block has a threaded hole with a lead screw threaded into it. The upper end of the lead screw is coaxial with and fixedly connected to the shaft of a drive motor. The fixed end of the drive motor, which is fixedly mounted on the movable block, rotates the lead screw, which in turn moves the movable block up and down, thereby moving the electric telescopic rod to the desired upper or lower position.

[0014] Preferably, the inlet branch pipe and the outlet branch pipe are respectively located at the top and bottom of the corresponding upper inlet area. The opposite ends of the inlet branch pipe and the outlet branch pipe are connected by a rear-end closed connecting pipe, and the connecting pipes are connected by a three-way valve.

[0015] The beneficial effects of this utility model are as follows: The use of this application can divide the inside of the vessel into an upper water inlet area, a lower water inlet area, an upper water outlet area, a lower water outlet area, and a heat exchange area through vertical and horizontal partitions. Thus, according to the three-way valve, when needed, half of the internal heat exchange tubes can be working while the other half is being cleaned, thereby ensuring that the heat exchange tubes can be cleaned without stopping the operation, improving work efficiency and saving a lot of time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram showing the connection between the water inlet branch pipe and the tee pipe around the vessel body; Figure 3 yes Figure 1 A magnified view of part of I.

[0018] As shown in the figure: 1. Vessel body; 2. Upper water inlet area; 3. Upper water outlet area; 4. Lower water inlet area; 5. Lower water outlet area; 6. Heat exchange area; 7. Heat exchange tube; 8. Scraper; 9. Moving shaft; 10. Round rod; 11. U-shaped plate; 12. Dovetail block; 13. Electric telescopic rod; 14. Drive motor; 15. Lead screw; 16. Three-way valve; 17. Water inlet branch pipe. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] A self-cleaning coupled reboiler, such as Figures 1-3As shown, the apparatus includes a horizontally placed vessel body 1 and vertical partitions fixedly installed on both sides of the vessel body 1. The vessel body 1 is divided into a water inlet zone, a heat exchange zone 6, and a water outlet zone by the vertical partitions. Multiple heat exchange tubes 7 are installed parallel to each other and fixedly inside the vessel body 1. The heat exchange tubes 7 are large-diameter pipes with slow-speed flow. The two ends of each heat exchange tube 7 pass through the corresponding vertical partitions and communicate with the corresponding water inlet zone and water outlet zone. The water inlet zone and water outlet zone are respectively connected to a main water inlet pipe and a main water outlet pipe. The bottom and top of the heat exchange zone 6 are respectively connected to an inlet pipe and an outlet pipe. A moving shaft 9 is coaxially installed inside each heat exchange tube 7. Several annular scrapers 8 are fixedly sleeved on the moving shaft 9 along its length. The side of the vessel body 1 in the heat exchange zone 6 has screw holes, which are sealed by threaded caps. The outer end of the moving shaft 9 extends into the corresponding screw hole and can be moved laterally by a tensioning mechanism. The water outlet zone is equipped with a drain pipe controlled by a valve.

[0021] In use, a liquid or gas enters the water inlet area through the water inlet main pipe, enters the heat exchange tube 7 through the water inlet area, flows through the heat exchange tube 7 within the annular scraper 8 and enters the water outlet area, and then enters the water outlet main pipe from the water outlet area. Meanwhile, another heat exchange liquid flows through the inlet and outlet pipes within the heat exchange area 6, thereby achieving heat exchange.

[0022] After a period of use, both liquids stop flowing into the system. Then, the screw cap is opened, and the moving shaft 9 is pulled by the tensioning mechanism. The moving shaft 9 moves the scraper 8 inside the heat exchange tube 7, thereby scraping off the dirt on the inner wall of the heat exchange tube 7. The dirt is then scraped into the outlet area, and the drain pipe is opened to discharge the dirt. This eliminates the need to disassemble the heat exchange tube 7 for cleaning, improving efficiency and saving a lot of valuable time.

[0023] Both the inlet and outlet water zones are fixedly equipped with transverse partitions, dividing them into an upper inlet zone 2, a lower inlet zone 4, an upper outlet zone 3, and a lower outlet zone 5. The upper inlet zone 2 and lower inlet zone 4 are each connected to a corresponding inlet branch pipe 17; the upper outlet zone 3 and lower outlet zone 5 are each connected to a corresponding outlet branch pipe. The inlet branch pipe 17 and outlet branch pipe are respectively located at the top and bottom of the corresponding upper inlet zone 2. The opposite ends of the inlet branch pipe 17 and outlet branch pipe extend rearward to a connecting pipe with a closed rear end, and the connecting pipes are connected by a three-way valve 16. Sewage pipes are respectively located at the lower part of the upper outlet zone 3 and lower outlet zone 5. The horizontal partition can separate the upper water inlet area 2, the lower water inlet area 4, the upper water outlet area 3, and the lower water outlet area 5. The upper water inlet area 2 and the lower water inlet area 4, as well as the upper water outlet area 3 and the lower water outlet area 5, work simultaneously. When it is necessary to clean the upper heat exchange tube 7 or the lower heat exchange tube 7, the three-way valve 16 can be controlled to allow water to enter the water inlet branch pipe 17 through the main water inlet pipe, and then enter the corresponding upper water inlet area 2 or lower water inlet area 4, while the other water inlet area does not receive water. This achieves cleaning of the non-water-receiving area, ensuring uninterrupted operation and further improving efficiency.

[0024] The stretching mechanism includes an electric telescopic rod 13 that can move up and down and be fixed by a lifting device. The movable end of the electric telescopic rod 13 is fixedly connected to a U-shaped plate 11 with a U-shaped opening facing the vessel body 1. Dovetail grooves are provided on the top and bottom surfaces of the transverse part of the U-shaped plate 11. Dovetail blocks 12 are slidably fitted in the dovetail grooves. A connecting rod is fixedly connected between two dovetail blocks 12. The connecting rod is rotatably connected to a round rod 10 through a bearing. The outer end of the round rod 10 is provided with an external thread. The outer end of the moving shaft 9 is vertically connected to a connecting plate. The four corners of the connecting plate are in contact with the screw holes and cannot rotate in the screw holes. A blind hole is provided on the side of the connecting plate facing the round rod 10, which is threaded to the outer end of the round rod 10. Rotating the round rod 10 allows it to be rotated into the blind hole, achieving a fixed connection between the round rod 10 and the connecting rod, and further a fixed connection with the moving shaft 9. Thus, when the electric telescopic rod 13 retracts, it drives the U-shaped plate to move, which in turn drives the round rod 10 to move, thereby moving the moving shaft 9. The U-shaped plate is provided with a dovetail groove and a dovetail block 12, which allows the round rod 10 to be threadedly connected to the connecting plate. When the U-shaped plate moves, the dovetail block 12 is first moved to the edge of the dovetail groove before moving. The electric telescopic rod 13, which can move up and down, can work in both the upper and lower areas, thus reducing costs.

[0025] The scraper 8 is fixedly connected to a connecting block by a connecting rod. The moving shaft 9 passes through the connecting block and is fixedly connected to the connecting block. The left and right sides of the scraper 8 are provided with flared mouths that are wider on the outside and narrower on the inside. The flared mouths on both sides of the scraper 8 can not only facilitate scraping the inner wall of the heat exchange tube 7, but also facilitate the flow of water in the flared mouths.

[0026] The lifting device includes a fixed vertical plate with a slide rail. A movable block is slidably fitted onto the slide rail. The movable block has a threaded hole with a threaded screw 15 threaded into it. The upper end of the screw 15 is coaxial with and fixedly connected to the shaft of the drive motor 14. The fixed end of the drive motor 14, with its fixed end attached to the movable block, is also fixedly connected to the electric telescopic rod 13. The rotation of the drive motor 14 shaft drives the screw 15 to rotate, which in turn moves the movable block up and down, thereby moving the electric telescopic rod 13 to the desired upper or lower position.

[0027] The use of this application allows the interior of the vessel body 1 to be divided into an upper water inlet zone 2, a lower water inlet zone 4, an upper water outlet zone 3, a lower water outlet zone 5, and a heat exchange zone 6 by means of vertical and horizontal partitions. Thus, according to the three-way valve 16, when needed, half of the internal heat exchange tubes 7 can be operated while the other half is cleaned, thereby ensuring that the cleaning of the heat exchange tubes 7 can be achieved without stopping the operation, improving work efficiency and saving a lot of time.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coupled reboiler with self-cleaning function, characterized in that: The apparatus includes a horizontally placed vessel body and vertical partitions fixedly installed on both sides of the vessel body. The vessel body is divided into a water inlet zone, a heat exchange zone, and a water outlet zone by the vertical partitions. Multiple heat exchange tubes are installed parallel to each other and fixedly inside the vessel body. The two ends of each heat exchange tube pass through the corresponding vertical partitions and communicate with the corresponding water inlet zone and water outlet zone. The water inlet zone and water outlet zone are respectively connected to a main water inlet pipe and a main water outlet pipe. The bottom and top of the heat exchange zone are respectively connected to an inlet pipe and an outlet pipe. A movable shaft is coaxially installed inside each heat exchange tube. Several scrapers are fixedly sleeved on the movable shaft along its length. The side of the vessel body in the heat exchange zone has screw holes, which are sealed by threaded caps. The outer end of the movable shaft extends into the corresponding screw hole and can be moved laterally by a tensioning mechanism. The water outlet zone is equipped with a drain pipe controlled by a valve.

2. The coupled reboiler with self-cleaning function according to claim 1, characterized in that: Both the inlet and outlet water areas are fixedly equipped with transverse partitions, which divide the inlet and outlet water areas into an upper inlet water area, a lower inlet water area, an upper outlet water area, and a lower outlet water area. The upper and lower inlet water areas are connected to corresponding inlet branch pipes. The upper and lower outlet water areas are also connected to corresponding outlet branch pipes. The inlet and outlet branch pipes are connected to the corresponding main inlet and main outlet water pipes through three-way valves. The sewage pipes are respectively installed at the lower part of the upper and lower outlet water areas.

3. The coupled reboiler with self-cleaning function according to claim 2, characterized in that: The stretching mechanism includes an electric telescopic rod that can move up and down and be fixed by a lifting device. The movable end of the electric telescopic rod is fixedly connected to a U-shaped plate with a U-shaped opening facing the vessel body. Dovetail grooves are provided on the top and bottom surfaces of the transverse part of the U-shaped plate. Dovetail blocks are slidably fitted in the dovetail grooves. A connecting rod is fixedly connected between two dovetail blocks. The connecting rod is rotatably connected to a round rod through a bearing. The outer end of the round rod is provided with an external thread. A connecting plate is vertically connected to the outer end of the moving shaft. The four corners of the connecting plate are in contact with the screw holes and cannot rotate within the screw holes. A blind hole is provided on the side of the connecting plate facing the round rod, which is in contact with the thread at the outer end of the round rod.

4. The coupled reboiler with self-cleaning function according to claim 3, characterized in that: The scraper is fixedly connected to a connecting block by a connecting rod. The moving shaft passes through the connecting block and is fixedly connected to the connecting block. The left and right sides of the scraper are provided with flared mouths that are wider on the outside and narrower on the inside.

5. The coupled reboiler with self-cleaning function according to claim 3, characterized in that: The lifting device includes a fixed vertical plate, a slide rail on the vertical plate, a movable block slidably fitted on the slide rail, a threaded hole on the movable block, a lead screw threaded into the threaded hole, the upper end of the lead screw being coaxial with and fixedly connected to the shaft of the drive motor, and the fixed end of the drive motor being fixedly connected to the movable block.

6. The coupled reboiler with self-cleaning function according to claim 2, characterized in that: The inlet branch pipe and the outlet branch pipe are respectively located at the top and bottom of the corresponding upper inlet area. The opposite ends of the inlet branch pipe and the outlet branch pipe extend backward with a connecting pipe that is closed at the rear end. The connecting pipes are connected by a three-way valve.

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