Online scale cleaning type shell-and-tube heat exchanger

Abstract

The utility model discloses an online scale cleaning type shell-and-tube heat exchanger. The online scale cleaning type shell-and-tube heat exchanger comprises a modularized shell-and-tube heat exchanger and an online scale cleaning unit, the modular shell-and-tube heat exchanger comprises a shell, a shell pass inlet, a shell pass outlet, a heat exchange tube, a tube plate, a shell pass baffle plate, a contact water chamber, a water inlet and outlet chamber, a tube pass inlet, a tube pass outlet, a first drain outlet, a first middle partition plate, a base, a shell pass connecting tube, a tube pass connecting tube and a second drain outlet. The online scale cleaning unit comprises an online scale cleaning assembly, a cam and a scale cleaning rocker; the on-line scale removing assembly comprises an expansion plate, a support, a cam groove, a nail plate, a connecting piece, a convex nail, a scale removing pull rod, a scale removing spiral scraper blade and a spring; on the basis of an existing modularized shell-and-tube heat exchanger, the in-tube online scale cleaning assembly is additionally arranged, the inner wall of the tube bundle is cleaned by driving the online scale cleaning assembly regularly, the cleanliness of the inner wall of the tube is further improved, and the problem of scaling and blocking of the heat exchange tube is fundamentally solved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to an online descaling shell-and-tube heat exchanger. Background Technology

[0002] In industrial production, heat exchangers are among the most commonly used process equipment, widely applied in industries such as metallurgy, petrochemicals, power, and building materials. The design and commissioning of heat exchangers greatly promote the efficient operation of production processes. Depending on the type of process medium involved in heat exchange and the differences in production process requirements, there are many types and forms of heat exchangers, the most common being shell-and-tube, plate, gas-liquid, gas-to-gas, and finned tube types. Different application scenarios require different heat exchanger types. However, in some wastewater heat exchange environments, scaling and clogging of heat exchangers has always been a difficult problem hindering the technological development of this industry. For example, condensers in power plants, wastewater heat exchangers in oil fields, and evaporators in wastewater source heat pumps have consistently experienced clogging. This not only affects the heat exchange efficiency of the equipment but also necessitates regular shutdowns for scaling removal, resulting in substantial losses in revenue and corresponding maintenance costs, severely damaging the production and operation of enterprises and the revenue generated from energy-saving projects. In response to this situation, many experts and companies have conducted extensive research and practice. Currently, the main descaling technologies in the industry include mechanical descaling, chemical descaling, physical descaling, and biological descaling. Different descaling technologies vary greatly in application scenarios, descaling effects, and technical reliability, and most require investment of manpower and resources to implement, resulting in high operating costs. Therefore, it is necessary to propose an online descaling shell-and-tube heat exchanger to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an online descaling shell-and-tube heat exchanger to solve the problem of scaling and clogging in heat exchangers.

[0004] This utility model provides an online descaling shell-and-tube heat exchanger, including a modular shell-and-tube heat exchanger and an online descaling unit. The modular shell-and-tube heat exchanger includes a shell, a shell-side inlet, a shell-side outlet, heat exchange tubes, a tube sheet, a shell-side baffle plate, a connecting water chamber, an inlet / outlet water chamber, a tube-side inlet, a tube-side outlet, a drain port one, an intermediate partition one, a base, a shell-side connecting pipe, a tube-side connecting pipe, and a drain port two. The online descaling unit includes an online descaling component, a cam, and a descaling rocker arm. The online descaling component includes an extension plate, a support, a cam groove, a nail plate, a connector, a protruding nail, a descaling pull rod, a descaling spiral scraper, and a spring. The shell and tube sheet are fixed together, and the tube sheet, tube-side connecting pipe, inlet / outlet water chamber, and connecting water chamber are connected and fixed together. The shell-side connecting pipe and the first heat exchange module... The shell-side inlet of the block and the shell-side outlet of the second heat exchange module are connected and fixed together. A middle partition plate is provided in the middle of the tube-side connecting tube, which divides the heat exchange tube into four areas. Each area is equipped with an online descaling assembly. The descaling spiral scraper is wound and fixed to the outer edge of the descaling pull rod. The ends of the descaling pull rod and the protruding nail are designed with external threads, and the two ends of the connector are designed with internal threads. The descaling pull rod and the protruding nail are fixedly connected to the connector by threads. Multiple protruding nails are fixed together with nail plates. Multiple nail plates are fixed together with one side of the expansion plate by welding. A spring is sleeved on the outside of the descaling pull rod corresponding to the expansion plate near the nail plate. A support is provided on each of the two end faces of the expansion plate, and a cam groove is provided on the other side of the expansion plate.

[0005] Furthermore, the pipe-side connecting pipe mainly includes a connecting pipe shell, a shaft hole, a drain outlet, a connecting flange, a limiting shaft groove, a limiting slide rail, a middle partition plate, and a shaft seat; a shaft seat is provided on each of the two sides of the middle partition plate of the pipe-side connecting pipe, and a shaft hole is opened on each of the connecting pipe shells corresponding to the shaft seats. A limiting slide rail is provided on each side of the shaft seat and the shaft hole, and a limiting shaft groove with a flange interface is provided on the outer side of the shaft hole. The scale removal rocker is equipped with a locking pin and a chuck.

[0006] Furthermore, the cam has an elliptical cross-section, with a square slot through hole on the cam end face and a circular through hole on each side of the cam groove. A square slot is also provided on both sides of the circular hole on one side of the cam groove. Each of the four heat exchange tube areas is equipped with an online descaling assembly, for a total of four sets of online descaling assemblies. These four sets are arranged in pairs, facing away from each other. Each descaling pull rod is concentrically arranged with its corresponding heat exchange tube, and the outer edge of the descaling spiral scraper is tangent to the inner wall of the heat exchange tube. The bottom surface of the support rests on the limiting slide rail, and the spring end in the initial state... Aligned with the side wall of the tube sheet, and with the other end aligned with the side wall of the nail plate, the cam groove end faces of the two sets of opposing online descaling components are fitted together. A cam is installed in the two fitted cam grooves. The side with the square groove on the cam groove faces outward. The rocker arm is inserted into and supported in the bearing seat through the limiting shaft groove, shaft hole, cam groove, and cam from the end with the chuck. The outer edge of the chuck is fitted with the inner wall of the square groove inside the cam. The inner end face of the chuck is fitted with the inner wall of the cam groove. The side of the pin is fitted with the flange face of the limiting shaft groove. A sealing structure is provided at the shaft hole.

[0007] Furthermore, the cleaning rocker arm adopts a motor-driven design.

[0008] Furthermore, the spiral spacing of the descaling spiral scraper is designed to allow the online descaling component to move back and forth.

[0009] Furthermore, the spring is a compressible spring.

[0010] This utility model has the following beneficial effects: The online descaling shell-and-tube heat exchanger provided by this utility model integrates three low-power anti-scaling and descaling technologies, providing a cost-effective option for the zero-scaling target of shell-and-tube heat exchangers; it avoids the jamming and failure problems commonly encountered in online mechanical descaling technology for long heat exchange tubes, thus improving the reliability of online descaling technology; the online descaling operation has no adverse effect on the operation of the heat exchanger, ensuring that the heat exchanger operates in a high-efficiency state in real time. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a top view of the online descaling shell-and-tube heat exchanger of this utility model;

[0013] Figure 2 This is a front view of the online descaling shell-and-tube heat exchanger of this utility model;

[0014] Figure 3 This is a side view of the online descaling shell-and-tube heat exchanger of this utility model;

[0015] Figure 4 yes Figure 1 A cross-sectional view along the AA direction;

[0016] Figure 5 yes Figure 1 Cross-sectional view along the BB direction;

[0017] Figure 6 yes Figure 2 A cross-sectional view along the CC direction;

[0018] Figure 7 yes Figure 3 A cross-sectional view along the DD direction;

[0019] Figure 8 This is the main view of the online descaling component;

[0020] Figure 9 This is a top view of the online descaling component;

[0021] Figure 10 This is a side view of the online descaling component;

[0022] Figure 11 This is a side view of the tube-side connection pipe;

[0023] Figure 12 This is the front view of the tube-side connection pipe;

[0024] Figure 13 This is a top view of the tube-side connection pipe;

[0025] Figure 14 yes Figure 11 Cross-sectional view along the EE direction;

[0026] Figure 15 This is a structural diagram of the cleaning rocker arm;

[0027] Figure 16 This is a structural diagram of a cam;

[0028] Figure 17 This is a three-dimensional schematic diagram of the online descaling shell-and-tube heat exchanger of this utility model.

[0029] Diagram Explanation: 1-Connecting Water Chamber; 2-Shell-side Inlet; 3-Shell; 4-Shell-side Connecting Pipe; 5-Tube-side Connecting Pipe; 6-Online Descaling Component; 7-Drain Port 1; 8-Tube-side Inlet; 9-Tube-side Outlet; 10-Inlet / Outlet Water Chamber; 11-Descaling Rocker; 12-Shell-side Outlet; 13-Drain Port 2; 14-Base; 15-Cam; 16-Tube Sheet; 17-Heat Exchanger Tube; 18-Shell-side Baffle; 19-Intermediate Partition 1; 5-1-Connection Pipe housing; 5-2-Shaft hole; 5-3-Drain outlet three; 5-4-Connecting flange; 5-5-Limiting shaft groove; 5-6-Limiting slide rail; 5-7-Intermediate partition two; 5-8-Shaft seat; 6-1-Extension plate; 6-2-Support; 6-3-Cam groove; 6-4-Nail plate; 6-5-Connector; 6-6-Protruding nail; 6-7-Scaling pull rod; 6-8-Scaling spiral scraper; 6-9-Spring; 11-1-Clamping pin; 11-2-Chuck. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] Please see Figures 1 to 17 This utility model provides an online descaling shell-and-tube heat exchanger, mainly composed of a modular shell-and-tube heat exchanger and an online descaling unit. The modular shell-and-tube heat exchanger mainly includes a shell 3, a shell-side inlet 2, a shell-side outlet 12, heat exchange tubes 17, a tube sheet 16, a shell-side baffle plate 18, a connecting water chamber 1, inlet and outlet water chambers 10, a tube-side inlet 8, a tube-side outlet 9, a drain port 1 7, an intermediate partition 19, a base 14, a shell-side connecting pipe 4, a tube-side connecting pipe 5, and a drain port 2 13. The online descaling unit... The system should include an online descaling assembly 6, a cam 15, and a descaling rocker arm 11; the pipe-side connecting pipe 5 mainly includes a connecting pipe shell 5-1, a shaft hole 5-2, a drain outlet 3 5-3, a connecting flange 5-4, a limiting shaft groove 5-5, a limiting slide rail 5-6, a middle partition 2 5-7, and a shaft seat 5-8; the online descaling assembly 6 mainly includes an extension plate 6-1, a support 6-2, a cam groove 6-3, a nail plate 6-4, a connector 6-5, a protruding nail 6-6, a descaling pull rod 6-7, a descaling spiral scraper 6-8, and a spring 6-9.

[0032] The shell 3 and tube sheet 16 are fixed together by sealing welding. The tube sheet 16, tube-side connecting pipe 5, inlet and outlet water chambers 10 and connecting water chamber 1 are fixed together by flange connection. The shell-side connecting pipe 4, the shell-side inlet 2 of the first heat exchange module and the shell-side outlet 12 of the second heat exchange module are fixed together by flange connection. The tube-side connecting pipe 5 is provided with an intermediate partition 5-7, which divides the heat exchange tube into four areas. Each area is equipped with an online descaling assembly 6. The descaling spiral scraper 6-8 is wrapped and fixed to the outer edge of the descaling pull rod 6-7. The ends of the descaling pull rod 6-7 and the protruding nail 6-6 are designed with external threads. The two ends of the connector 6-5 are designed with internal threads. The descaling pull rod 6-7 and the protruding nail 6-6 are connected by screws. The connecting piece 6-5 is fixedly connected to the threaded joint. Multiple protruding nails 6-6 are fixed together with nail plates 6-4 by welding. Multiple nail plates 6-4 are fixed together with one side of the extension plate 6-1 by welding. A spring 6-9 is fitted on the outside of the cleaning rod 6-7 corresponding to the extension plate 6-1 near the nail plate 6-4. A support 6-2 is provided on each of the two end faces of the extension plate 6-1. A cam groove 6-3 is provided on the other side of the extension plate 6-1. A bearing seat 5-8 is provided on each of the two sides of the middle partition plate 5-7 of the pipe-side connecting pipe 5. A shaft hole 5-2 is opened on each of the connecting pipe shells 5-1 corresponding to the bearing seat 5-8. A limiting slide rail 5-6 is provided on each side of the bearing seat 5-8 and the shaft hole 5-2. The outer side is provided with a flange interface limiting shaft groove 5-5. The cleaning rocker arm 11 is provided with a locking pin 11-1 and a chuck 11-2. The cross section of the cam 15 is elliptical. A square slot through hole is opened on the end face of the cam 15. A circular through hole is opened on both sides of the cam groove 6-3. A square slot hole is opened on both sides of the circular hole on one side of the cam groove 6-3. Each of the four heat exchange tube areas is provided with an online cleaning assembly 6, for a total of four sets of online cleaning assemblies 6. These four sets of online cleaning assemblies 6 are arranged back to back in pairs. Each cleaning pull rod 6-7 is concentrically arranged with the corresponding heat exchange tube 17, and the outer edge of the cleaning spiral scraper 6-8 is tangent to the inner wall of the heat exchange tube 17. The bottom surface of the support 6-2 is supported on the limiting slide rail 5-6. The spring 6-9 in the initial state One end is aligned with the side wall of the tube sheet 16, and the other end is aligned with the side wall of the nail plate 6-4. The end faces of the cam grooves 6-3 of the two sets of online descaling components 6 are fitted together. A cam 15 is installed in the two fitted cam grooves 6-3. The side with the square groove on the cam groove 6-3 faces outward. The rocker arm 11 is inserted into and supported in the bearing seat 5-8 through the limiting shaft groove 5-5, shaft hole 5-2, cam groove 6-3, and cam 15 from the end with the chuck 11-2. The outer edge of the chuck 11-2 is fitted with the inner wall of the square groove inside the cam 15. The inner end face of the chuck 11-2 is fitted with the inner wall of the cam groove 6-3. The side of the pin 11-1 is fitted with the flange face of the limiting shaft groove 5-5. This ensures that the descaling rocker arm 11 is more stable during rotation.Meanwhile, a sealing structure is installed at shaft hole 5-2 to ensure that the medium does not leak at shaft hole 5-2;

[0033] Preferably, the descaling rocker 11 is designed with a motor drive, which facilitates the automated and efficient descaling operation of the online descaling component 6.

[0034] Preferably, the spiral spacing of the descaling spiral scraper 6-8 is designed to allow the online descaling component 6 to move back and forth, ensuring that the scraper can scrape all areas of the inner wall of the heat exchange tube 17.

[0035] Preferably, springs 6-9 are compressible springs, providing power for the reset of the online descaling assembly 6.

[0036] The descaling operation process is as follows: When descaling is required, manually or electrically rotate the descaling rocker 11. The rocker drives the chuck 11-2 to rotate, and the chuck 11-2 drives the cam 15 to rotate. The cam 15 pushes the cam groove 6-3 and the entire online descaling assembly 6 to move towards the corresponding heat exchange tube 17. When the cam 15 rotates to the horizontal position, this is the maximum displacement point that the online descaling assembly 6 can move, and it is also the shortest compression point of the spring 6-9. Then, release the descaling rocker 11. Under the elastic force of the spring 6-9, the online descaling assembly 6 returns to the initial position. During this process, the descaling spiral scraper 6-8 forms a longitudinal reciprocating scraping on the inner wall of the heat exchange tube 17, scraping off the dirt on the inner wall of the tube. Under the flushing action of the water flow, the scraped dirt is carried out of the heat exchange tube. At the same time, the drain port 3 5-3 is opened to perform a draining operation, and the dirt is discharged from the heat exchanger, thereby achieving the goal of ensuring the real-time cleanliness of the inner wall of the tube.

[0037] In summary, this utility model presents an online descaling shell-and-tube heat exchanger. Utilizing the high straightness of the short heat exchange tubes in a modular shell-and-tube heat exchanger, it improves the ease of installation and operational reliability of the movable online descaling component. Employing a spiral structure as the descaling scraper, and with the online descaling component arranged in a back-to-back configuration, it effectively reduces resistance during the descaling process and increases the turbulence intensity of the wastewater inside the tubes, thereby enhancing the overall heat exchange effect. Using a rocker arm and cam as the driving structure for the online descaling component, and a spring as the driving force for its reset process, it significantly reduces power consumption during descaling. Online descaling ensures the cleanliness of the inner tube wall, reduces heat transfer resistance, and improves heat exchange efficiency. It also avoids heat loss due to downtime for maintenance, increasing energy savings. By integrating short heat exchange tube anti-scaling technology, online descaling technology, and online drainage technology, it fundamentally solves the problem of scale buildup and blockage on the inner wall of the heat exchange tubes.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An online descaling shell-and-tube heat exchanger, characterized in that, include: Modular shell-and-tube heat exchangers and online descaling units; The modular shell-and-tube heat exchanger includes a shell (3), a shell-side inlet (2), a shell-side outlet (12), heat exchange tubes (17), a tube sheet (16), a shell-side baffle plate (18), a connecting water chamber (1), an inlet and outlet water chamber (10), a tube-side inlet (8), a tube-side outlet (9), a drain outlet one (7), an intermediate partition one (19), a base (14), a shell-side connecting pipe (4), a tube-side connecting pipe (5), and a drain outlet two (13). The online descaling unit includes an online descaling component (6), a cam (15), and a descaling rocker (11); the online descaling component (6) includes an extension plate (6-1), a support (6-2), a cam groove (6-3), a nail plate (6-4), a connector (6-5), a protruding nail (6-6), a descaling pull rod (6-7), a descaling spiral scraper (6-8), and a spring (6-9); The shell (3) and tube sheet (16) are fixed together. The tube sheet (16), tube-side connecting pipe (5), inlet and outlet water chambers (10) and connecting water chamber (1) are connected and fixed together. The shell-side connecting pipe (4), the shell-side inlet (2) of the first heat exchange module and the shell-side outlet (12) of the second heat exchange module are connected and fixed together. The tube-side connecting pipe (5) is provided with a middle partition plate (5-7). The middle partition plate (5-7) divides the heat exchange tube into four areas. Each area is provided with an online descaling assembly (6). The descaling spiral scraper (6-8) is wrapped and fixed on the outer edge of the descaling pull rod (6-7). The ends of the descaling pull rod (6-7) and the protrusion (6-6) are both The connector (6-5) is designed with an external thread and internal threads at both ends. The cleaning rod (6-7) and the protruding nail (6-6) are fixedly connected to the connector (6-5) by threads. Multiple protruding nails (6-6) are fixed together with nail plates (6-4). Multiple nail plates (6-4) are fixed together with one side of the extension plate (6-1) by welding. A spring (6-9) is fitted on the outside of the cleaning rod (6-7) corresponding to the extension plate (6-1) near the nail plate (6-4). A support (6-2) is provided on each of the two end faces of the extension plate (6-1). A cam groove (6-3) is provided on the other side of the extension plate (6-1).

2. The online descaling shell-and-tube heat exchanger as described in claim 1, characterized in that, The pipe-side connecting pipe (5) includes a connecting pipe shell (5-1), a shaft hole (5-2), a third drain outlet (5-3), a connecting flange (5-4), a limiting shaft groove (5-5), a limiting slide rail (5-6), a second intermediate partition plate (5-7), and a shaft seat (5-8). A bearing seat (5-8) is provided on each side of the middle partition plate 2 (5-7) of the pipe-side connecting pipe (5). A shaft hole (5-2) is opened on each side of the connecting pipe shell (5-1) corresponding to the bearing seat (5-8). A limiting slide rail (5-6) is provided on each side of the bearing seat (5-8) and the shaft hole (5-2). A limiting shaft groove (5-5) with a flange interface is provided on the outside of the shaft hole (5-2). A locking pin (11-1) and a chuck (11-2) are provided on the cleaning rocker (11).

3. The online descaling shell-and-tube heat exchanger as described in claim 2, characterized in that, The cam (15) has an elliptical cross-section. A square slot through hole is provided on the end face of the cam (15). A circular through hole is provided on both sides of the cam groove (6-3). A square slot hole is provided on both sides of the circular hole on one side of the cam groove (6-3). Each of the four heat exchange tube areas is equipped with an online descaling assembly (6), for a total of four sets of online descaling assemblies (6). The four sets of online descaling assemblies (6) are arranged back to back in pairs. Each descaling pull rod (6-7) is concentrically arranged with the corresponding heat exchange tube (17), and the outer edge of the descaling spiral scraper (6-8) is tangent to the inner wall of the heat exchange tube (17). The bottom surface of the support (6-2) is supported on the limiting slide rail (5-6). In the initial state, one end of the spring (6-9) is aligned with the side wall of the tube sheet (16), and the other end is aligned with the nail plate (6- 4) The side walls are aligned, and the end faces of the cam grooves (6-3) of the two sets of online cleaning components (6) are fitted together. A cam (15) is installed in the two fitted cam grooves (6-3). The side with the square groove on the cam groove (6-3) faces outward. The rocker arm (11) is inserted and supported in the bearing seat (5-8) through the limiting shaft groove (5-5), shaft hole (5-2), cam groove (6-3), and cam (15) from the end with the chuck (11-2). The outer edge of the chuck (11-2) is fitted with the inner wall of the square groove inside the cam (15). The inner end face of the chuck (11-2) is fitted with the inner wall of the cam groove (6-3). The side of the pin (11-1) is fitted with the flange face of the limiting shaft groove (5-5). A sealing structure is set at the shaft hole (5-2).

4. The online descaling shell-and-tube heat exchanger as described in claim 3, characterized in that, The cleaning rocker arm (11) is designed with a motor drive.

5. An online descaling shell-and-tube heat exchanger as described in claim 4, characterized in that, The spiral spacing of the cleaning spiral scraper (6-8) is designed to allow the online cleaning component (6) to move back and forth.

6. The online descaling shell-and-tube heat exchanger as described in claim 5, characterized in that, Springs (6-9) are compressible springs.

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