A high efficiency shell and tube heat exchanger of membrane and finned tube

Abstract

The utility model discloses a kind of high-efficiency shell-and-tube heat exchangers of membrane type finned tube, including shell, first tube sheet and second tube sheet are separately arranged in the both ends of shell, a plurality of corresponding openings are equipped on first tube sheet and second tube sheet, corresponding opening between first tube sheet and second tube sheet is connected by pipeline, the end of first tube sheet is installed with first tube box, the end of second tube sheet is installed with second tube box, range baffle is equipped in first tube box, first fluid inlet and first fluid outlet are equipped on first tube box, second fluid inlet and second fluid outlet are equipped on shell, membrane type finned tube is equipped on the lateral wall of pipeline;By setting membrane type fin on pipeline, increase the heat exchange area of pipeline, even in high temperature and high pressure environment, relative to traditional shell-and-tube heat exchanger, length is unchanged, increase the heat exchange area of pipeline, equivalent to improve the heat exchange efficiency of liquid in pipeline, increase the heat exchange effect in high temperature and high pressure environment, improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, specifically to a high-efficiency shell-and-tube heat exchanger with membrane finned tubes. Background Technology

[0002] Membrane finned tubes, also known as membrane finned tubes, have fins that are tightly bonded to the tube through welding or rolling to form a membrane-like structure. This results in almost no contact thermal resistance between the fins and the tube, leading to superior heat transfer performance. They are mainly used to enhance heat transfer and improve heat exchange efficiency. Shell-and-tube heat exchangers are a common type of heat exchange equipment widely used in industrial production. They are primarily used to achieve heat transfer between two fluids to achieve the purpose of heat exchange.

[0003] For example, patent CN110455096B, published on August 6, 2024, discloses a baffle support structure with a flow-diverting effect and its shell-and-tube heat exchanger. Several baffles capable of forming flow paths are arranged at intervals within the shell-and-tube heat exchanger. A flow-diverting support plate is added between adjacent baffles. The flow-diverting support plate has a notched area, a tube-laying area, and a non-tube-laying area, with at least one flow-diverting window in the non-tube-laying area. The assembly of the flow-diverting support plate satisfies the following condition: the notched area of ​​the flow-diverting support plate is arranged in the opposite direction to the notched area of ​​the previous baffle and in the same direction as the notched area of ​​the next baffle. The shell-and-tube heat exchanger uses the aforementioned baffle support structure with a flow-diverting effect. This invention can significantly reduce the unsupported span of the heat exchange tube bundle, which is beneficial for reducing the flow dead zone and improving heat exchange efficiency, significantly reducing the flow velocity of the fluid laterally scouring the tube bundle, and avoiding tube bundle vibration problems. With the same number of tubes, smaller tube spacing, more compact tube arrangement, and higher heat transfer economy of the heat exchanger.

[0004] While traditional shell-and-tube heat exchangers can meet the heat exchange requirements under normal operating conditions, they cannot be installed in situations where the space required for heat exchange is limited. This is because shell-and-tube heat exchangers are relatively short, and when the liquid to be cooled passes through them, the cooling effect is often not significant, resulting in a decrease in the overall heat exchange efficiency of the shell-and-tube heat exchanger and affecting production. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency shell-and-tube heat exchanger with membrane finned tubes to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-efficiency shell-and-tube heat exchanger with membrane finned tubes includes a shell, with a first tube sheet and a second tube sheet respectively disposed at both ends of the shell. The first tube sheet and the second tube sheet have multiple corresponding openings, and the corresponding openings on the first tube sheet and the second tube sheet are connected by pipes. A first tube box is fixedly installed at the end of the first tube sheet, and a second tube box is installed at the end of the second tube sheet. A baffle plate is disposed inside the first tube box, and a first fluid inlet and a first fluid outlet are disposed on the first tube box. A second fluid inlet and a second fluid outlet are disposed on the shell, and membrane finned tubes are installed on the sidewalls of the pipes.

[0008] The membrane finned tube described above includes a heat-conducting tube slidably mounted on the side wall of the pipe and a plurality of heat-conducting fins, wherein the plurality of heat-conducting fins are arranged sequentially along the axis of the heat-conducting tube.

[0009] As described above, the interior of the housing is provided with multiple baffles, which are arranged at intervals above and below each other.

[0010] As described above, multiple membrane finned tubes are provided, and the multiple membrane finned tubes correspond to multiple baffles, with the membrane finned tubes connected to the corresponding baffles.

[0011] As described above, a rectangular spiral groove is formed on the outer wall of the pipe, and a sliding block is fixedly installed on the inner wall of the heat-conducting pipe, the sliding block being inserted into the corresponding rectangular spiral groove.

[0012] As described above, the multiple baffles are connected by a connecting frame, one end of which is connected to a linear moving member, which drives the connecting frame to slide along the axial direction of the pipe with the baffles.

[0013] As mentioned above, a scraping part is also provided on the inner wall of the housing, which is used to scrape off the scale on the surface of the heat-conducting fins.

[0014] The scraping part described above includes a connecting rod mounted on the housing, a plurality of movable rods being provided on the connecting rod, the plurality of movable rods being connected to the connecting rod by an adjusting spring, and a scraper being mounted on the end of the movable rod away from the housing, the scraper abutting against the surface of the heat-conducting fins.

[0015] As described above, the housing is detachably connected to the first pipe box and the second pipe box.

[0016] As mentioned above, the housing has an openable and closable notch, which is used to clean scale from the inner wall of the housing.

[0017] The beneficial effects of this utility model are as follows: In the above technical solution, the high-efficiency shell-and-tube heat exchanger of the membrane finned tube provided by this utility model increases the heat exchange area of ​​the pipe through which the liquid to be cooled passes by by setting membrane fins. Even under high temperature and high pressure environment, compared with the traditional shell-and-tube heat exchanger, under the premise of unchanged length, increasing the heat exchange area of ​​the pipe is equivalent to improving the heat exchange efficiency of the liquid in the pipe, thereby increasing the heat exchange effect under high temperature and high pressure environment and improving production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the structure of a high-efficiency shell-and-tube heat exchanger with membrane finned tubes provided for an embodiment of this utility model;

[0020] Figure 2 A front structural schematic diagram of a high-efficiency shell-and-tube heat exchanger with membrane finned tubes provided in an embodiment of this utility model;

[0021] Figure 3 A schematic diagram of the shell structure provided for an embodiment of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the first pipe box provided in an embodiment of the present utility model;

[0023] Figure 5 A schematic diagram of the internal structure of the housing provided in this embodiment of the invention.

[0024] Figure 6 Provided for the embodiments of this novel Figure 5 Enlarged view of point A;

[0025] Figure 7 Provided for the embodiments of this novel Figure 5 A schematic diagram of the cross-section of BB.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Shell; 2. First tube sheet; 3. Second tube sheet; 4. Opening; 5. Pipe; 51. Rectangular spiral groove; 6. First tube box; 7. Second tube box; 8. Divider plate; 10. First fluid inlet; 11. First fluid outlet; 12. Second fluid inlet; 13. Second fluid outlet; 14. Membrane finned tube; 141. Heat-conducting pipe; 142. Heat-conducting fin; 143. Sliding block; 15. Baffle plate; 16. Connecting frame; 17. Linear moving part; 18. Scraping part; 181. Connecting rod; 182. Moving rod; 183. Scraper. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the following will be described in conjunction with the appendix. Figure 1-7 This invention will now be described in further detail.

[0029] A high-efficiency shell-and-tube heat exchanger with membrane finned tubes includes a shell 1. A first tube sheet 2 and a second tube sheet 3 are respectively provided at both ends of the shell 1. The first tube sheet 2 and the second tube sheet 3 have multiple corresponding openings 4. The corresponding openings 4 on the first tube sheet 2 and the second tube sheet 3 are connected by a pipe 5. A first tube box 6 is fixedly installed at the end of the first tube sheet 2, and a second tube box 7 is installed at the end of the second tube sheet 3. A partition plate 8 is provided inside the first tube box 6. A first fluid inlet 10 and a first fluid outlet 11 are provided on the first tube box 6. A second fluid inlet 12 and a second fluid outlet 13 are provided on the shell 1. Membrane finned tubes 14 are installed on the side wall of the pipe 5.

[0030] Specifically, the partition plate 8 divides the first tube box 6 into two chambers arranged vertically, each chamber connected to a portion of the pipe 5. In this embodiment, the first fluid inlet 10 is located at the upper end of the first tube box 6. When the existing shell-and-tube heat exchanger is in operation, the operator receives the liquid to be cooled outside the first fluid inlet 10. The flow path of the liquid to be cooled is as follows: the liquid to be cooled enters the upper chamber of the first tube box 6 through the first fluid inlet 10, and then enters the pipe 5 connected to the upper chamber of the first tube box 6, and flows along the pipe 5 to... Inside the second tube box 7, the liquid then enters the lower cavity of the first tube box 6 through the pipe 5 connected to the second tube box 7. Furthermore, the operator needs to introduce cooling medium into the shell 1. The flow path of the cooling medium is as follows: the operator introduces cooling medium into the shell 1 through the second fluid inlet 12. The cooling medium moves within the shell 1 and flows out from the second fluid outlet 13. The pipe 5 passes through the interior of the shell 1. When liquid to be cooled is introduced into the pipe 5, the movement of the cooling medium carries away the heat from the liquid in the pipe 5, completing the heat exchange process.

[0031] The shortcomings of existing technology are: when the space required for heat exchange is relatively narrow, it is not possible to install a large shell-and-tube heat exchanger. Furthermore, when there are harsh environments such as high temperature and high pressure in the working space, the shell-and-tube heat exchanger is relatively short, and when the liquid to be cooled passes through the shell-and-tube heat exchanger, the cooling effect is not obvious, the heat exchange efficiency of the entire shell-and-tube heat exchanger decreases, and production is affected.

[0032] To address the aforementioned issues, preferably, membrane fins are installed on the pipe 5 through which the liquid to be cooled passes. The membrane finned tube 14 includes a heat-conducting pipe 141 slidably mounted on the side wall of the pipe 5 and multiple heat-conducting fins 142. The multiple heat-conducting fins 142 are arranged sequentially along the axis of the heat-conducting pipe 141. The heat-conducting pipe 141 and the heat-conducting fins 142 on the outside of the pipe 5 increase the heat exchange area of ​​the pipe 5. Even under high temperature and high pressure conditions, compared with traditional shell-and-tube heat exchangers, increasing the heat exchange area of ​​the pipe 5 without changing the length is equivalent to improving the heat exchange efficiency of the liquid inside the pipe 5, thereby increasing the heat exchange effect under high temperature and high pressure conditions and improving production efficiency.

[0033] Preferably, the housing 1 is provided with a plurality of baffles 15, which are arranged vertically at intervals.

[0034] When the cooling medium enters the shell 1 through the second fluid inlet 12, the multiple baffles 15 obstruct the flow of the cooling medium inside the shell 1, causing the cooling medium to flow in an "S" shape inside the shell 1. This indirectly increases the length of the movement path of the cooling medium inside the shell 1, thereby increasing the contact time between the cooling medium and the heat exchange wall of the pipe 5 and the surface film finned tube 14, which helps to absorb heat more fully and improve cooling efficiency.

[0035] Preferably, multiple membrane finned tubes 14 are provided, and multiple membrane finned tubes 14 correspond to multiple baffles 15. The membrane finned tubes 14 are connected to the corresponding baffles 15. In this embodiment, the heat-conducting tube 141 and the baffle 15 are rotatably connected. A rectangular spiral groove 51 is provided on the outer wall of the pipe 5. A sliding block 143 is fixedly installed on the inner wall of the heat-conducting tube 141. The sliding block 143 is inserted into the corresponding rectangular spiral groove 51. Multiple baffles 15 are connected by a connecting frame 16. One end of the connecting frame 16 is connected to a linear moving member 17. The linear moving member 17 is used to drive the connecting frame 16 to slide along the axial direction of the pipe 5 with the baffles 15. It should be noted that the length of the heat-conducting tube 141 is shorter than the length of the pipe 5. The length difference between the heat-conducting tube 141 and the pipe 5 is the movable distance of the baffle 15 in the housing 1.

[0036] Specifically, the linear moving part 17 can be a waterproof, electrically controlled telescopic rod. When the linear moving part 17 begins to extend, its telescopic end drives the connecting frame 16, carrying the baffle 15, to slide along the axial direction of the pipe 5 within the housing 1. The flow state of the cooling medium around the baffle 15 easily changes from laminar to turbulent. In the turbulent state, the radial mixing of the cooling medium is enhanced, and the cooling medium undergoes violent random motion in all directions. This allows the heat of the liquid to be cooled inside the pipe 5, guided by the heat pipe 141 and heat-conducting fins 142, to be transferred more fully, thereby indirectly increasing the efficiency of the shell-and-tube heat exchanger. The heat exchange efficiency of the heat exchanger is improved. Furthermore, as the baffle plate 15 moves, the baffle plate 15 moves synchronously with the membrane finned tube 14. The membrane finned tube 14 moves on the surface of the pipe 5. As the membrane finned tube 14 moves, the sliding block 143 on the inner wall of the heat-conducting tube 141 slides along the rectangular spiral groove 51 on the outer wall of the pipe 5. At this time, the heat-conducting tube 141 moves and rotates on the outer wall of the pipe 5. The heat-conducting fins 142 on the heat-conducting tube 141 rotate synchronously. When the heat-conducting fins 142 rotate, the heat transfer process between the cooling medium and the surface of the heat-conducting fins 142 can be significantly enhanced, thereby improving the cooling efficiency.

[0037] It should be noted that the cooling medium used in existing shell-and-tube heat exchangers is usually cooling water. Long-term use of cooling water as the cooling medium can easily lead to the formation of scale on the surface of the heat-conducting fins 142. The scale forms a heat insulation layer on the surface of the heat-conducting fins 142, which hinders the exchange of heat between the heat-conducting fins 142 and the cooling medium, resulting in a significant decrease in heat exchange efficiency and affecting cooling efficiency.

[0038] To solve the above problems, preferably, a scraping part 18 is also provided on the inner wall of the housing 1. The scraping part 18 is used to scrape off the scale on the surface of the heat-conducting fins 142. The scraping part 18 includes a connecting rod 181 installed on the housing 1. A plurality of moving rods 182 are provided on the connecting rod 181. The plurality of moving rods 182 are connected to the connecting rod 181 by an adjusting spring (the adjusting spring is not shown in the figure). A scraper 183 is installed at the end of the moving rod 182 away from the housing 1. The scraper 183 abuts against the surface of the heat-conducting fins 142.

[0039] Specifically, when the heat pipe 141 moves and rotates simultaneously on the surface of the pipe 5 (the principle of moving and rotating simultaneously is the same as above), the heat pipe 141 moves synchronously with the heat-conducting fins 142. At this time, as the heat-conducting fins 142 rotate, they come into contact with the scraper 183, which removes the scale on the heat-conducting fins 142. Furthermore, as the heat-conducting fins 142 move, the water flow can carry away the scale, preventing scale from accumulating on the heat-conducting fins 142 and affecting the heat exchange effect. To adapt to the heat-conducting fins... As the heat-conducting fin 142 moves, the scraper 183 is slidably mounted on the connecting rod 181 via the moving rod 182. When the heat-conducting fin 142 moves, the scraper 183 slides on the connecting rod 181 under the pressure of the heat-conducting fin 142, carrying the moving rod 182. At this time, the adjusting spring accumulates elastic potential energy. When the linear moving member 17 drives the connecting frame 16 to reset with the baffle 15, the adjusting spring releases the accumulated elastic potential energy, ensuring that the scraper 183 moves with the heat-conducting fin 142 and that the scraper 183 can always be in contact with the surface of the heat-conducting fin 142.

[0040] It should also be noted that when the scraper 183 is in contact with the heat-conducting fins 142, the scraper 183 can also act as a heat-conducting metal to absorb heat in the pipe 5, further improving the cooling rate of the medium in the pipe 5.

[0041] Preferably, the shell 1 is detachably connected to the first tube box 6 and the second tube box 7. In this embodiment, the shell 1 is connected to the first tube box 6 and the second tube box 7 by bolts, and the shell 1 has an openable and closable notch (not shown in the notch figure). The notch is used to clean the scale on the inner wall of the shell 1. When it is necessary to clean the scale on the inner wall of the shell 1, the staff opens the notch and cleans the scale on the inner wall of the shell 1. After the scale cleaning is completed, the staff closes the notch and restores the original state, waiting for the next heat exchange treatment.

[0042] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes, characterized in that, The device includes a housing, with a first tube sheet and a second tube sheet respectively provided at both ends of the housing. The first tube sheet and the second tube sheet have multiple corresponding openings, and the corresponding openings on the first tube sheet and the second tube sheet are connected by pipes. A first tube box is fixedly installed at the end of the first tube sheet, and a second tube box is installed at the end of the second tube sheet. A first partition plate is provided inside the first tube box, and a first fluid inlet and a first fluid outlet are provided on the first tube box. A second fluid inlet and a second fluid outlet are provided on the housing, and membrane finned tubes are installed on the side wall of the pipes.

2. The high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 1, characterized in that, The membrane finned tube includes a heat-conducting tube slidably mounted on the side wall of the pipe and a plurality of heat-conducting fins, wherein the plurality of heat-conducting fins are arranged sequentially along the axis of the heat-conducting tube.

3. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 2, characterized in that, The interior of the housing is provided with multiple baffles, which are arranged at intervals above and below each other.

4. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 3, characterized in that, Multiple membrane finned tubes are provided, and the multiple membrane finned tubes correspond to multiple baffles. The membrane finned tubes are connected to the corresponding baffles.

5. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 4, characterized in that, A rectangular spiral groove is formed on the outer wall of the pipe, and a sliding block is fixedly installed on the inner wall of the heat-conducting pipe. The sliding block is inserted into the corresponding rectangular spiral groove.

6. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 5, characterized in that, The multiple baffles are connected by a connecting frame, one end of which is connected to a linear moving member, which drives the connecting frame to slide along the axial direction of the pipe with the baffles.

7. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 6, characterized in that, The inner wall of the housing is also provided with a scraping part, which is used to scrape off the scale on the surface of the heat-conducting fins.

8. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 7, characterized in that, The scraping part includes a connecting rod mounted on the housing, and a plurality of movable rods are provided on the connecting rod. The plurality of movable rods are connected to the connecting rod by an adjusting spring. A scraper is installed at the end of the movable rod away from the housing, and the scraper abuts against the surface of the heat-conducting fins.

9. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 1, characterized in that, The housing is detachably connected to the first and second pipe boxes.

10. A high-efficiency shell-and-tube heat exchanger with membrane finned tubes according to claim 9, characterized in that, The shell has an openable and closable notch for cleaning scale from the inner wall of the shell.

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