Tube plate heat exchanger

Abstract

The utility model discloses a tube-sheet heat exchanger, belongs to the field of heat exchange, overcomes the defect that in the prior art, a heat exchanger box body is too high in cost, and mainly adopts the technical scheme that the tube-sheet heat exchanger comprises a heat exchange box body and a heat exchange sleeve fixedly arranged on the heat exchange box body, a lower heat exchange cavity used for circulating smoke and a plurality of sets of heat exchange plates arranged in the lower heat exchange cavity at intervals are arranged in the heat exchange box body, upper heat exchange cavities isolated from the lower heat exchange cavity are formed in the heat exchange sleeves, the upper heat exchange cavities in every two adjacent heat exchange sleeves are communicated with each other, first flowing cavities are formed in the heat exchange plates, and second flowing cavities are formed in the heat exchange plates. A first flowing cavity is formed in the heat exchange sleeve, a phase change material is arranged in the first flowing cavity, a plurality of heat exchange pipes extending into the upper heat exchange cavity are connected to the single heat exchange plate, one heat exchange pipe is contained in the single upper heat exchange cavity, a second flowing cavity communicated with the first flowing cavity is formed in each heat exchange pipe, and cold side fluid flows between the heat exchange pipes and the heat exchange sleeve. The heat exchanger is mainly used for reducing the cost of the box body for bearing the fluid to be subjected to heat exchange in the heat exchanger.

Description

Technical Field

[0001] This application relates to the field of heat exchange, and in particular to a tube sheet heat exchanger. Background Technology

[0002] A vacuum heat exchanger is a heat exchange device that operates in a vacuum environment, primarily used to transfer heat between fluids at different temperatures. Its structure typically includes a shell, tube bundle, and tube sheet. The shell ensures the internal vacuum environment, the tube bundle is the main site of heat exchange, and the tube sheet fixes the tube bundle and separates different fluid zones. Its working principle utilizes the special thermophysical properties of fluids under vacuum conditions, such as lower boiling points, allowing the low-temperature fluid to more easily evaporate and absorb heat in a vacuum environment. The high-temperature fluid then transfers heat to the low-temperature fluid through the tube bundle, achieving efficient heat transfer. Vacuum heat exchangers offer many advantages, such as achieving efficient evaporation at lower temperatures, reducing energy consumption, and effectively preventing material oxidation due to the vacuum environment, making them suitable for heating or cooling heat-sensitive materials. They are widely used in industries such as chemical, pharmaceutical, and food processing, and are crucial equipment for improving production efficiency and product quality.

[0003] In existing vacuum heat exchanger technology, a large enclosure typically houses all the heat exchange tubes. The fluid to be heat-exchanged flows within the enclosure, and heat is transferred to the fluid through the heat exchange tubes, thus completing the heat exchange process. However, with the continuous increase in heat exchange demand, a large number of heat exchange tubes need to be accommodated, and more fluid needs to flow within the enclosure, leading to a significant increase in pressure inside the enclosure. This high-pressure environment places extremely high demands on the thickness and material properties of the enclosure. Manufacturing such heat exchangers to meet large heat exchange demands often requires a significant investment in enclosure manufacturing to ensure the strength and stability of the enclosure. Moreover, due to the unstable pressure of the fluid to be heat-exchanged, the enclosure is also at risk of damage. Once the enclosure is damaged, it will not only affect the normal operation of the heat exchanger but may also lead to production interruption and greater economic losses. Summary of the Invention

[0004] In order to overcome the shortcomings of the high cost of heat exchanger housing in the prior art, this application provides a tube sheet heat exchanger, which reduces the cost of the housing that carries the fluid to be exchanged in the heat exchanger.

[0005] To achieve the above objectives, this application adopts the following technical solution: a tube sheet heat exchanger, comprising a heat exchange chamber and heat exchange sleeves fixed on the heat exchange chamber. The heat exchange chamber is provided with a lower heat exchange cavity for circulating flue gas and multiple sets of heat exchange plates spaced apart in the lower heat exchange cavity. The heat exchange sleeves are provided with an upper heat exchange cavity isolated from the lower heat exchange cavity. The upper heat exchange cavities in two adjacent heat exchange sleeves are interconnected. The heat exchange plates are provided with a first flow cavity containing a phase change material. Multiple heat exchange tubes extending into the upper heat exchange cavity are connected to a single heat exchange plate. A single upper heat exchange cavity contains one heat exchange tube. The heat exchange tube is provided with a second flow cavity communicating with the first flow cavity. A cold-side fluid flows between the heat exchange tube and the heat exchange sleeves.

[0006] After adopting the above technical solution, this application has the following advantages: Compared with using a box to enclose the heat exchange tube, using a single heat exchange sleeve to enclose a single heat exchange tube can reduce the pressure-bearing capacity requirements inside the heat exchange sleeve. This solution, by setting up a heat exchange box and a heat exchange sleeve, divides the heat exchange space into a lower heat exchange chamber and an upper heat exchange chamber, changing the fluid flow mode and reducing the overall high-pressure requirements of the heat exchange sleeve. This reduces the large amount of cost required to ensure strength and stability in the manufacturing of the heat exchange sleeve, effectively reducing the overall cost of the heat exchange sleeve that carries the fluid to be heat exchanged. After absorbing heat from the flue gas in the first flow chamber, the phase change material transforms into a gaseous state. The gaseous phase change material flows to the heat exchange tube in the upper heat exchange chamber, which is the second flow chamber. Since the fluid outside the heat exchange tube is the cold-side fluid, the gaseous phase change material transfers heat to the cold-side fluid. After releasing all the heat, the gaseous phase change material becomes a liquid phase change material and flows back to the first flow chamber, thus completing the heat transfer cycle. Furthermore, since the fluid in a single upper heat exchange chamber exchanges heat with a single heat exchange tube, the heat exchange is more targeted. In addition, the fluid content in the upper heat exchange chamber is relatively small. Compared with the original heat exchange method of large water tank, it can avoid the existence of dead zones in the fluid in the upper heat exchange chamber and avoid the formation of a heat insulation layer on the outer wall of the heat exchange tube, thus increasing the overall heat exchange efficiency.

[0007] Furthermore, the upper heat exchange cavities within two adjacent heat exchange sleeves are interconnected through a connecting part located at the top or bottom of the heat exchange sleeve, with adjacent connecting parts staggered in position.

[0008] Using the aforementioned technical solution, the fluid does not flow directly from one chamber to another in a straight line. Instead, due to the staggered arrangement of the connecting parts, it undergoes certain bends and deflections, thereby increasing the fluid's residence time and flow distance within the heat exchange chamber. This allows the fluid to make full contact with components such as the heat exchange tubes, improving heat exchange efficiency. From a structural perspective, the staggered arrangement of the connecting parts enhances the stability of the entire heat exchange sleeve structure to a certain extent. Adjacent sleeves are interconnected through connecting parts, and their staggered positions make the structure more robust.

[0009] Furthermore, a manifold is connected between each pair of adjacent heat exchange tubes on a single heat exchange plate. The manifold is provided with an interface for connecting to an air pump, so that the air pump can reduce the air pressure in the first flow chamber and the second flow chamber.

[0010] Using the aforementioned technical solution, based on the principle of phase equilibrium, reducing the gas pressure can lower the boiling point of the phase change material. When the gas pressure in the first and second flow chambers is reduced, the phase change material can undergo a phase change at a lower temperature, transforming from a liquid to a gaseous state. This allows it to absorb heat from the flue gas more efficiently, enhancing the heat absorption process and improving the overall heat exchange efficiency of the heat exchanger.

[0011] Furthermore, the upper heat exchange cavities within two adjacent heat exchange sleeves are interconnected through a connecting part, and the manifold is located within the connecting part.

[0012] By adopting the aforementioned technical solution, placing the manifold within the connecting section allows for efficient use of the space within the connecting section. This avoids requiring additional space inside the heat exchanger to accommodate the manifold, resulting in a more compact structure and higher space utilization. This facilitates achieving more functions and better heat exchange within a limited space. Furthermore, the gaseous phase change material located within the manifold can exchange heat with the cold-side fluid, reducing heat loss. If the manifold were not located within the connecting section, heat within the manifold would be released into the environment, leading to significant heat loss and reduced heat exchange efficiency.

[0013] Furthermore, the axis of the manifold is inclined to the horizontal plane.

[0014] By employing the aforementioned technical solution, the inclined design of the manifold allows the liquid phase change material to flow out more smoothly under the influence of gravity. For example, when the gaseous phase change material flows into the manifold, its temperature is absorbed by the fluid to be heat exchanged, causing the phase change material to become liquid. At this point, the inclined manifold provides a guiding effect, accelerating the flow of the liquid phase change material out of the manifold and preventing fluid accumulation or dead zones within the manifold. This improves the circulation efficiency of the phase change material and further enhances the heat transfer effect. Simultaneously, the inclined angle also causes some disturbance and mixing of the fluids to be heat exchanged at different locations during the convergence process, resulting in a more uniform temperature distribution and improved overall heat exchange efficiency.

[0015] Furthermore, a leak-proof water tank is provided above the heat exchange box body, which is fitted over all the heat exchange sleeves.

[0016] Using the aforementioned technical solution, since the fluid inside the heat exchanger jacket is in a state of flow and heat exchange during operation, leakage may occur due to sealing failure. The leak-proof tank can promptly catch any leaking fluid, preventing it from directly leaking into the surrounding environment and causing damage to equipment, personnel, and surrounding facilities. When a fluid leak occurs, the leaking liquid accumulates in the leak-proof tank, making it easier for personnel to detect the leak promptly. By checking whether there is liquid in the leak-proof tank and the amount and nature of the liquid, it is possible to quickly determine whether a leak exists and its approximate location, thus enabling timely repairs, reducing equipment downtime and production interruptions caused by leaks, and improving production efficiency.

[0017] Furthermore, the upper heat exchange cavity is provided with a main water inlet and a main water outlet, the main water inlet being located downstream in the flue gas flow direction and the main water outlet being located upstream in the flue gas flow direction.

[0018] By employing the aforementioned technical solution and using counter-current heat exchange (i.e., the flow directions of the cold fluid (inlet water) and the hot fluid (flue gas) are opposite), the temperature difference between the cold and hot fluids can be kept relatively balanced throughout the heat exchange process. In this case, the fluid to be exchanged in the upper heat exchange chamber enters from the main inlet, where its temperature is relatively low, encountering the relatively low-temperature flue gas after downstream heat exchange. Conversely, when the fluid to be exchanged flows out from the main outlet, its temperature has increased, encountering the higher-temperature upstream flue gas. This ensures that there is always a certain temperature difference between the fluid to be exchanged and the flue gas throughout the entire heat exchange process, thereby increasing the driving force for heat transfer, improving heat exchange efficiency, and enabling more efficient use of the heat from the flue gas to heat the fluid to be exchanged, achieving more efficient heat exchange.

[0019] Furthermore, water pumps are installed at both the main inlet and the main outlet.

[0020] The aforementioned technical solution, with its two pumps, allows for greater system flexibility in adjustment. The operating status of the inlet and outlet pumps can be adjusted separately according to actual conditions, achieving different operating modes. For example, during startup, the inlet pump can be started first to fill the upper heat exchange chamber with the fluid to be exchanged, and then the outlet pump can be started to begin normal circulation and heat exchange. Alternatively, when cleaning or maintenance is required, the operation of a single pump can be controlled independently for convenient operation. Furthermore, the fluid to be exchanged encounters resistance as it flows through the heat exchange sleeves and pipes, especially when the system is large, the pipes are long, or the number of heat exchange sleeves is large. The two pumps provide sufficient power to overcome this flow resistance, ensuring smooth circulation of the fluid throughout the upper heat exchange chamber system, guaranteeing the continuity and stability of the heat exchange process.

[0021] Furthermore, the heat exchange tube and the heat exchange plate are connected by an intermediate pipe. The part of the intermediate pipe that connects to the heat exchange tube is a circular pipe, and the part of the intermediate pipe that connects to the heat exchange plate is an elliptical pipe.

[0022] Using the aforementioned technical solution, the circular pipe connected to the heat exchange tube can be well adapted to the shape of the heat exchange tube, allowing the gaseous phase change material to flow more naturally and smoothly from the heat exchange tube into the intermediate pipe, reducing flow resistance and turbulence caused by abrupt changes in pipe shape. Meanwhile, the elliptical pipe connected to the heat exchange plate can be better adapted to the shape and spatial distribution of the flow channels within the heat exchange plate, allowing the gaseous phase change material to enter the first flow chamber within the heat exchange plate more smoothly, which is beneficial for its circulation throughout the system.

[0023] Furthermore, the heat exchange tube has an elliptical shape on the upper and lower projection planes, similar to the second flow cavity, and the lower end of the heat exchange tube is connected to the heat exchange plate.

[0024] Using the aforementioned technical solution, the elliptical heat exchange tube has a larger surface area compared to other shapes such as circles, under the same cross-sectional area. A larger surface area means a greater contact area between the heat exchange tube and the surrounding cold-side fluid, enabling more efficient heat exchange and improving the efficiency of heat transfer from the gaseous phase change material to the cold-side fluid. When the gaseous phase change material flows within the second flow cavity, it can dissipate heat more quickly, accelerating its transformation from a gaseous to a liquid state, thereby promoting the entire heat transfer cycle. Furthermore, because the shape of the heat exchange tube is the same as that of the second flow cavity, the flow of the phase change material within the second flow cavity is smoother and more stable. Attached Figure Description

[0025] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0026] Figure 1 This is a schematic diagram of a tube sheet heat exchanger according to this application;

[0027] Figure 2 for Figure 1 The left view;

[0028] Figure 3 This is a magnified view of point A;

[0029] Figure 4 This is a magnified view of point B.

[0030] Figure descriptions: 1. Heat exchanger body; 11. Lower heat exchange chamber; 2. Heat exchange sleeve; 21. Upper heat exchange chamber; 22. Connecting part; 23. Main water inlet; 24. Main water outlet; 3. Heat exchange plate; 31. First flow chamber; 4. Heat exchange tube; 41. Second flow chamber; 5. Manifold; 6. Leak-proof water tank; 7. Intermediate pipe; 8. Interface. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0032] The terms "first," "second," etc. (if present) in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this application, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this application, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.

[0033] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0034] like Figures 1 to 4 As shown, this application provides a tube sheet heat exchanger, including a heat exchange box 1 and a heat exchange sleeve 2 fixed on the heat exchange box 1. The heat exchange box 1 is provided with a lower heat exchange chamber 11 for flue gas circulation and multiple sets of heat exchange plates 3 spaced apart in the lower heat exchange chamber 11. The heat exchange sleeve 2 is provided with an upper heat exchange chamber 21 isolated from the lower heat exchange chamber 11. The upper heat exchange chambers 21 in two adjacent heat exchange sleeves 2 are interconnected. The heat exchange plate 3 is provided with a first flow chamber 31, and the first flow chamber 31 is provided with a phase change material. Multiple heat exchange tubes 4 extending into the upper heat exchange chamber 21 are connected to a single heat exchange plate 3. A single upper heat exchange chamber 21 contains a heat exchange tube 4. The heat exchange tube 4 is provided with a second flow chamber 41 communicating with the first flow chamber 31. A cold-side fluid flows between the heat exchange tube 4 and the heat exchange sleeve 2.

[0035] After adopting the above technical solution, this application has the following advantages: Compared with using a box to house the heat exchange tube 4, using a single heat exchange sleeve 2 to house a single heat exchange tube 4 can reduce the pressure bearing capacity requirement inside the heat exchange sleeve 2. This solution divides the heat exchange space into a lower heat exchange chamber 11 and an upper heat exchange chamber 21 by setting up a heat exchange box 1 and a heat exchange sleeve 2, which changes the fluid flow mode and reduces the overall pressure bearing requirement of the heat exchange sleeve 2. This reduces the large amount of cost required to ensure strength and stability in the manufacturing of the heat exchange sleeve 2, and effectively reduces the overall cost of the heat exchange sleeve 2 that carries the fluid to be heat exchanged. After absorbing heat from the flue gas in the first flow chamber 31, the phase change material transforms into a gaseous state. This gaseous phase change material then flows into the heat exchange tube 4 of the upper heat exchange chamber 21, which is the second flow chamber 41. Since the fluid outside the heat exchange tube 4 is the cold-side fluid, the gaseous phase change material transfers heat to the cold-side fluid. After releasing all its heat, the gaseous phase change material becomes a liquid phase change material and flows back into the first flow chamber 31, thus completing the heat transfer cycle. Furthermore, because the fluid in a single upper heat exchange chamber 21 exchanges heat with a single heat exchange tube 4, the heat exchange is more targeted. The lower fluid content in the upper heat exchange chamber 21, compared to the previous large water tank heat exchange method, avoids dead zones in the fluid within the upper heat exchange chamber 21 and prevents the formation of an insulation layer on the outer wall of the heat exchange tube 4, thereby increasing the overall heat exchange efficiency.

[0036] Furthermore, the upper heat exchange cavities 21 in two adjacent heat exchange sleeves 2 are interconnected through a connecting part 22, which is located at the top or bottom of the heat exchange sleeve 2, and the positions of two adjacent connecting parts 22 are staggered.

[0037] Using the aforementioned technical solution, the fluid does not flow directly from one chamber to another in a straight line. Instead, due to the staggered arrangement of the connecting parts 22, it undergoes certain bends and deflections, thereby increasing the fluid's residence time and flow distance within the heat exchange chamber. This allows the fluid to fully contact the heat exchange tubes 4 and other components, improving the efficiency of heat exchange. From a structural perspective, the staggered arrangement of the connecting parts 22 enhances the stability of the entire heat exchange sleeve 2 structure to a certain extent. Adjacent sleeves are interconnected through the connecting parts 22, and their staggered positions further strengthen the structure.

[0038] Furthermore, a manifold 5 is connected between each pair of adjacent heat exchange tubes 4 on a single heat exchange plate 3. The manifold 5 is provided with an interface 8 for connecting to an air pump, so that the air pump can reduce the air pressure in the first flow chamber 31 and the second flow chamber 41.

[0039] Using the aforementioned technical solution, based on the principle of phase equilibrium, reducing the gas pressure can lower the boiling point of the phase change material. By reducing the gas pressure in the first flow chamber 31 and the second flow chamber 41 through the gas pump connected to interface 8, the phase change material can undergo a phase change at a lower temperature, changing from a liquid state to a gaseous state. This allows it to absorb heat from the flue gas more efficiently, enhancing the heat absorption process and improving the overall heat exchange efficiency of the heat exchanger.

[0040] Furthermore, the upper heat exchange cavities 21 in two adjacent heat exchange sleeves 2 are interconnected through a connecting part 22, and the manifold 5 is located in the connecting part 22.

[0041] By adopting the aforementioned technical solution, placing the manifold 5 within the connecting portion 22 allows for efficient use of the space within the connecting portion 22. This avoids requiring additional space inside the heat exchanger to accommodate the manifold 5, resulting in a more compact structure and higher space utilization. This facilitates achieving more functions and better heat exchange within a limited space. Furthermore, the gaseous phase change material within the manifold 5 can exchange heat with the cold-side fluid, reducing heat loss. If the manifold 5 were not located within the connecting portion 22, the heat within it would be released into the environment, leading to significant heat loss and reduced heat exchange efficiency.

[0042] Furthermore, the axis of the manifold 5 is inclined to the horizontal plane.

[0043] By employing the aforementioned technical solution, the inclined arrangement of the manifold 5 allows the liquid phase change material to flow out more smoothly under the influence of gravity. For example, when the gaseous phase change material flows into the manifold 5, its temperature is absorbed by the fluid to be heat exchanged, causing the phase change material to become liquid. At this time, the inclined manifold 5 can provide a certain guiding effect, accelerating the outward flow of the liquid phase change material and preventing the fluid from accumulating or forming dead zones within the manifold 5. This improves the circulation efficiency of the phase change material and further enhances the heat transfer effect. Simultaneously, the inclined angle also causes some disturbance and mixing of the fluids to be heat exchanged at different locations during the convergence process, resulting in a more uniform temperature distribution and improved overall heat exchange efficiency.

[0044] Furthermore, a leak-proof water tank 6 is provided above the heat exchange box 1, which is fitted over all the heat exchange sleeves 2.

[0045] Using the aforementioned technical solution, since the fluid inside the heat exchanger sleeve 2 is in a state of flow and heat exchange during operation, leakage may occur due to sealing failure. The leak-proof water tank 6 can promptly catch any leaking fluid, preventing it from directly leaking into the surrounding environment and causing damage to equipment, personnel, and surrounding facilities. When a fluid leak occurs, the leaking liquid will accumulate in the leak-proof water tank 6, making it easier for personnel to detect the leak promptly. By checking whether there is liquid in the leak-proof water tank 6 and the amount and nature of the liquid, it is possible to quickly determine whether a leak exists and its approximate location, thereby enabling timely repairs, reducing equipment downtime and production interruptions caused by leaks, and improving production efficiency.

[0046] Furthermore, the upper heat exchange cavity 21 is provided with a total water inlet 23 and a total water outlet 24. The total water inlet 23 is located downstream in the flue gas flow direction, and the total water outlet 24 is located upstream in the flue gas flow direction.

[0047] By employing the aforementioned technical solution and using counter-current heat exchange (i.e., the flow directions of the cold fluid (inlet water) and the hot fluid (flue gas) are opposite), the temperature difference between the cold and hot fluids can be kept relatively balanced throughout the heat exchange process. In this case, the fluid to be exchanged in the upper heat exchange chamber 21 enters from the main inlet 23. At this point, the temperature of the fluid to be exchanged is relatively low, and it encounters the flue gas, which is relatively low after downstream heat exchange. When the fluid to be exchanged flows out from the main outlet 24, its temperature has increased, and it encounters the upstream flue gas, which is higher. This ensures that a certain temperature difference is maintained between the fluid to be exchanged and the flue gas throughout the entire heat exchange process, thereby increasing the driving force for heat transfer, improving heat exchange efficiency, and enabling more efficient use of the heat from the flue gas to heat the fluid to be exchanged, thus achieving more efficient heat exchange.

[0048] Furthermore, water pumps are installed at both the main inlet 23 and the main outlet 24.

[0049] The aforementioned technical solution, with its two pumps, allows for greater system flexibility in adjustment. The operating status of the inlet and outlet pumps can be adjusted separately according to actual conditions, enabling different operating modes. For example, during startup, the inlet pump can be started first to fill the upper heat exchange chamber 21 with the fluid to be exchanged, and then the outlet pump can be started to begin normal circulation and heat exchange. Alternatively, when cleaning or maintenance is required, the operation of a single pump can be controlled independently for convenient operation. Furthermore, the fluid to be exchanged encounters resistance as it flows through the heat exchange sleeve 2 and pipes, especially when the system is large, the pipes are long, or the number of heat exchange sleeves 2 is large. The two pumps provide sufficient power to overcome this flow resistance, ensuring smooth circulation of the fluid throughout the upper heat exchange chamber 21 system, guaranteeing the continuity and stability of the heat exchange process.

[0050] Furthermore, the heat exchange tube 4 and the heat exchange plate 3 are connected by an intermediate pipe 7. The part of the intermediate pipe 7 that connects to the heat exchange tube 4 is a circular pipe, and the part of the intermediate pipe 7 that connects to the heat exchange plate 3 is an elliptical pipe.

[0051] Using the aforementioned technical solution, the circular pipe connected to the heat exchange tube 4 can be well adapted to the shape of the heat exchange tube 4, allowing the gaseous phase change material to flow more naturally and smoothly from the heat exchange tube 4 into the intermediate pipe 7, reducing flow resistance and turbulence caused by abrupt changes in pipe shape. Meanwhile, the elliptical pipe connected to the heat exchange plate 3 can be better adapted to the shape and spatial distribution of the flow channels within the heat exchange plate 3, allowing the gaseous phase change material to enter the first flow cavity 31 within the heat exchange plate 3 more smoothly, which is beneficial for its circulation throughout the system.

[0052] Furthermore, the heat exchange tube 4 has an elliptical shape on the upper and lower projection planes, similar to the second flow cavity 41, and the lower end of the heat exchange tube 4 is connected to the heat exchange plate 3.

[0053] Using the aforementioned technical solution, the elliptical heat exchange tube 4, under the same cross-sectional area, has a larger surface area compared to other shapes such as circles. A larger surface area means an increased contact area between the heat exchange tube 4 and the surrounding cold-side fluid, thus enabling more efficient heat exchange and improving the efficiency of heat transfer from the gaseous phase change material to the cold-side fluid. When the gaseous phase change material flows within the second flow cavity 41, it can dissipate heat more quickly, accelerating its transformation from a gaseous to a liquid state, thereby promoting the entire heat transfer cycle. Furthermore, because the shape of the heat exchange tube 4 is the same as that of the second flow cavity 41, the flow of the phase change material within the second flow cavity 41 is smoother and more stable.

[0054] In addition to the preferred embodiments described above, this application has other implementation methods. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection claimed in this application.

Claims

1. A tube sheet heat exchanger, characterized in that, The system includes a heat exchange chamber (1) and heat exchange sleeves (2) fixed to the heat exchange chamber (1). The heat exchange chamber (1) has a lower heat exchange cavity (11) for flue gas circulation and multiple sets of heat exchange plates (3) spaced apart in the lower heat exchange cavity (11). The heat exchange sleeves (2) have an upper heat exchange cavity (21) isolated from the lower heat exchange cavity (11). The upper heat exchange cavities (21) in two adjacent heat exchange sleeves (2) are interconnected. The heat exchange plates (3) The heat exchange plate (3) is provided with a first flow chamber (31), and a phase change material is provided in the first flow chamber (31). Multiple heat exchange tubes (4) extending into the upper heat exchange chamber (21) are connected to a single heat exchange plate (3). A single upper heat exchange chamber (21) contains a heat exchange tube (4). A second flow chamber (41) communicating with the first flow chamber (31) is provided in the heat exchange tube (4). Cold side fluid flows between the heat exchange tube (4) and the heat exchange sleeve (2).

2. A tube sheet heat exchanger according to claim 1, characterized in that, The upper heat exchange chambers (21) in two adjacent heat exchange sleeves (2) are connected to each other through a connecting part (22). The connecting part (22) is located at the top or bottom of the heat exchange sleeve (2), and the positions of two adjacent connecting parts (22) are staggered.

3. A tube sheet heat exchanger according to claim 1, characterized in that, A manifold (5) is connected between two adjacent heat exchange tubes (4) on a single heat exchange plate (3). The manifold (5) is provided with an interface for connecting to an air pump so that the air pump reduces the air pressure in the first flow chamber (31) and the second flow chamber (41).

4. A tube sheet heat exchanger according to claim 3, characterized in that, The upper heat exchange chambers (21) in two adjacent heat exchange sleeves (2) are connected to each other through a connecting part (22), and the manifold (5) is located in the connecting part (22).

5. A tube sheet heat exchanger according to claim 3 or 4, characterized in that, The axis of the manifold (5) is inclined to the horizontal plane.

6. A tube sheet heat exchanger according to claim 1, characterized in that, A leak-proof water tank (6) is provided above the heat exchange box (1) and is fitted over all the heat exchange sleeves (2).

7. A tube sheet heat exchanger according to claim 1, characterized in that, The upper heat exchange cavity (21) is provided with a main water inlet (23) and a main water outlet (24). The main water inlet (23) is located downstream of the flue gas flow direction, and the main water outlet (24) is located upstream of the flue gas flow direction.

8. A tube sheet heat exchanger according to claim 7, characterized in that, Water pumps are installed at both the main inlet (23) and the main outlet (24).

9. A tube sheet heat exchanger according to claim 1, characterized in that, The heat exchange tube (4) and the heat exchange plate (3) are connected by an intermediate pipe (7). The intermediate pipe (7) is circular when it connects to the heat exchange tube (4), and it is elliptical when it connects to the heat exchange plate (3).

10. A tube sheet heat exchanger according to claim 1, characterized in that, The heat exchange tube (4) has an elliptical shape on the upper and lower projection planes, which is the same as that of the second flow cavity (41). The lower end of the heat exchange tube (4) is connected to the heat exchange plate (3).

Images