Large temperature difference heat exchange waste heat recovery device

Abstract

The present disclosure relates to the technical field of heat exchange, and one embodiment of the present disclosure provides a large-temperature-difference heat exchange waste heat recovery device, which comprises a recovery tank, and a supporting table is arranged at the bottom of the recovery tank. Through the above technical scheme, the technical problem that the existing heat exchange devices generally have some deficiencies is solved, for example, in a long-time running process, the heat exchange temperature difference is small, which means that the heat that can be recovered in a unit time is limited, the potential of waste heat resources cannot be fully tapped, and due to the low heat exchange efficiency, in order to meet a certain heat recovery demand, the heat exchange device often needs to be equipped with a driving device with large power, which not only increases the shaft power consumption of the equipment, causes energy waste, but also accelerates the wear of the equipment, shortens the service life of the equipment, and increases the cost of equipment maintenance and replacement.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of heat exchange technology, and more specifically, to a waste heat recovery device for large temperature difference heat exchange. Background Technology

[0002] Against the backdrop of increasingly tense global energy situation, efficient energy utilization and reduced energy consumption have become key issues that various industries urgently need to address. Waste heat, as a recyclable low-grade energy source, is widely present in many fields such as industrial production, power supply, and building heating. If waste heat can be effectively recovered and reused, it can not only significantly improve the comprehensive utilization rate of energy and reduce the production costs of enterprises, but also reduce thermal pollution to the environment and make a positive contribution to achieving sustainable development goals.

[0003] In traditional waste heat recovery technologies, heat exchange devices are the core equipment for achieving waste heat recovery. However, existing heat exchange devices generally have some shortcomings. For example, during long-term operation, the heat exchange temperature difference is small, which means that the amount of heat that can be recovered per unit time is limited, and the potential of waste heat resources cannot be fully explored. Moreover, due to the low heat exchange efficiency, in order to meet certain heat recovery needs, heat exchange devices often need to be equipped with high-power drive equipment. This not only increases the shaft power consumption of the equipment, leading to energy waste, but also accelerates the wear and tear of the equipment, shortens the service life of the equipment, and increases the cost of equipment maintenance and replacement.

[0004] Taking thermal power plants as an example, most thermal power plants use extraction condensing steam turbine units. The steam extracted from the turbine is directly used to heat the return water of the heating network. In this process, the extraction pressure is generally greater than 0.25 MPa, the supply water temperature of the heating network is between 110℃ and 150℃, and the return water temperature is between 70℃ and 90℃. The temperature difference between the supply and return water is small, which requires the circulating pump to consume a lot of electricity to maintain the hot water circulation, resulting in low transmission efficiency and a large amount of energy loss during transmission. With the acceleration of urbanization, the demand for urban heating is constantly increasing, but the existing heating network has limited transmission capacity due to the small temperature difference between the supply and return water, which is difficult to meet the growing demand for centralized heating. At the same time, a large amount of heat carried by the circulating cooling water of thermal power plants is directly discharged into the atmosphere, causing serious energy waste. If this part of low-temperature heat can be effectively recovered, it can not only significantly improve the overall thermal efficiency of thermal power plants and reduce coal consumption, but also bring multiple benefits such as water conservation and environmental protection.

[0005] In the industrial sector, many production processes generate a large amount of waste heat resources such as high-temperature exhaust gas and wastewater. Traditional heat exchange devices, when recovering this waste heat, are unable to fully convert the waste heat into a usable energy form due to the small temperature difference and low efficiency, resulting in a large amount of waste heat being wasted. In addition, some industries face problems such as large equipment footprint and complex installation and maintenance when using heat exchange devices for waste heat recovery, which further limits the widespread application of waste heat recovery technology.

[0006] In heat pump systems, traditional technology relies on the phase change heat recovery of circulating refrigerant in the evaporator to recover waste heat. The maximum recovery temperature is generally only 4-10℃. To achieve waste heat recovery with a larger temperature difference, a secondary circulating water loop needs to be added. This not only makes the system structure more complex, but also leads to a decrease in the evaporation temperature of the heat pump system, thereby affecting the thermal efficiency of the entire heat pump system.

[0007] In summary, existing waste heat recovery technologies have many problems in terms of heat exchange temperature difference, efficiency, energy consumption, and equipment maintenance. There is an urgent need for a new type of waste heat recovery device that can achieve large temperature difference heat exchange, improve heat exchange efficiency, reduce energy consumption, and is easy to maintain, so as to meet the current dual requirements of efficient energy utilization and environmental protection. The large temperature difference heat exchange waste heat recovery device has emerged in this context, aiming to overcome the shortcomings of traditional technologies and bring new solutions to the field of waste heat recovery. Utility Model Content

[0008] To overcome the above-mentioned defects, the embodiments of this disclosure provide a waste heat recovery device for large temperature difference heat exchange, which solves some shortcomings of existing heat exchange devices. For example, during long-term operation, the heat exchange temperature difference is small, which means that the amount of heat that can be recovered per unit time is limited, and the potential of waste heat resources cannot be fully explored. Moreover, due to the low heat exchange efficiency, in order to meet certain heat recovery requirements, the heat exchange device often needs to be equipped with a high-power drive device. This not only increases the shaft power consumption of the device, leading to energy waste, but also accelerates the wear and tear of the device, shortens the service life of the device, and increases the cost of device maintenance and replacement.

[0009] According to one aspect, at least one embodiment of this disclosure provides a waste heat recovery device for large temperature difference heat exchange, comprising:

[0010] A recycling tank, the bottom of which is provided with a support platform;

[0011] A heat exchange circulation assembly is disposed inside the recovery tank;

[0012] Overheated plug-in assemblies, the overheated plug-in assemblies being disposed on opposite sides of the recycling tank;

[0013] The heat exchange circulation assembly includes a circulation joint connected to the upper end face of the recovery tank. A partition plate is provided inside the recovery tank. A circulation cavity is opened on the support platform and is connected to the recovery tank. A filter screen is provided between the circulation cavity and the recovery tank. An extension pipe is connected to the lower end of the circulation joint, and an intercepting mesh cover is opened on the side wall of the extension pipe.

[0014] As a further technical solution, the inner wall of the extension tube is provided with a connecting conical cover, and a connecting tube is fixedly inserted inside the connecting conical cover, the connecting tube being located inside the interception net cover.

[0015] As a further technical solution, the overheated connector assembly includes an overheated connector, which is disposed at opposite ends of the recovery tank. An insertion rod is disposed inside the overheated connector, and an insertion sleeve is fitted on the insertion rod. A push spring is disposed on the insertion rod, and the end of the insertion rod is fixedly connected to the inner wall of the overheated connector. A positioning block is disposed at the end of the insertion sleeve, and the end of the push spring is connected to the positioning block.

[0016] As a further technical solution, the overheating joint is internally connected to an overheating pipe, and the end of the overheating pipe is connected to a branch pipe.

[0017] As a further technical solution, the branch pipe has an O-shaped structure, and the intercepting net covers pass through the intervals of the branch pipe.

[0018] As a further technical solution, a secondary filter screen is provided between the circulation chamber and the partition plate, and the secondary filter screen is compatible with the cross-sectional structure of the circulation chamber.

[0019] As a further technical solution, a connecting flange is provided on the upper end face of the circulation joint.

[0020] As a further technical solution, the branch pipe passes through the partition plate, and the branch pipe and the partition plate are sealed and inserted together.

[0021] The beneficial effects of the embodiments disclosed herein are as follows:

[0022] 1. In this disclosure, the large temperature difference heat exchange waste heat recovery device achieves efficient large temperature difference heat exchange through a unique structural design. In the heat exchange circulation assembly, the coordinated work of components such as the circulation joint, extension pipe, intercepting mesh cover, and connecting conical cover optimizes the flow path of the heat exchange medium, allowing the heat exchange medium to come into fuller contact with the superheated medium. In particular, the design of the branch pipe having an O-shaped structure and the intercepting mesh cover passing through its intervals greatly increases the contact area of ​​heat exchange, effectively improving the heat exchange efficiency. Compared with traditional devices, it can achieve a larger heat exchange temperature difference, thereby more fully tapping the potential of waste heat resources, increasing the amount of heat recovered per unit time, and enabling the effective recovery of low-grade waste heat that was originally difficult to utilize.

[0023] 2. In this disclosure, the device reduces energy consumption and maintenance costs during operation through a reasonable structural layout and functional design. On the one hand, due to the improved heat exchange efficiency, it is no longer necessary to equip the device with high-power drive equipment to meet the heat recovery requirements, thereby reducing shaft power consumption and energy waste. On the other hand, the multi-filtration design of the filter screen, interception screen, and secondary filter screen effectively filters impurities in the heat exchange medium, preventing impurities from causing wear and damage to the heat exchange components, extending the service life of the equipment, and reducing the frequency of equipment maintenance and replacement. In addition, the automatic sealing design of the push spring and plug sleeve in the overheated plug assembly ensures the sealing of the overheated medium access, reduces heat loss, and further reduces operating energy consumption. This makes the device more in line with environmental protection and energy conservation requirements while reducing enterprise production costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0025] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure;

[0026] Figure 2 This is a cross-sectional view of the recycling tank disclosed herein;

[0027] Figure 3 This is an isometric view of the positioning block disclosed herein;

[0028] Figure 4 This is a cross-sectional view of the extension tube of this disclosure;

[0029] In the diagram: 1. Recovery tank; 2. Support platform; 3. Heat exchange circulation assembly; 3-1. Circulation joint; 3-2. Divider plate; 3-3. Circulation chamber; 3-4. Filter screen; 3-5. Extension pipe; 3-6. Interception screen cover; 3-7. Connecting conical cover; 3-8. Connecting pipe; 4. Overheat plug-in assembly; 4-1. Overheat joint; 4-2. Plug-in rod; 4-3. Plug-in sleeve; 4-4. Push spring; 4-5. Positioning block; 4-6. Overheat pipe; 4-7. Branch pipe; 5. Secondary filter screen; 6. Connecting flange. Detailed Implementation

[0030] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0031] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0032] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0033] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0035] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] like Figures 1-4 As shown, it illustrates the waste heat recovery device for large temperature difference heat exchange of this disclosure, comprising:

[0037] Recycling tank 1, with a support platform 2 at its bottom;

[0038] Heat exchange circulation assembly 3 is installed inside the recovery tank 1;

[0039] Overheated plug-in assembly 4 is disposed on opposite sides of the recovery tank 1;

[0040] The heat exchange circulation assembly 3 includes a circulation connector 3-1, which is connected to the upper end face of the recovery tank 1. The recovery tank 1 is provided with a partition plate 3-2. A circulation chamber 3-3 is opened on the support platform 2 and is connected to the recovery tank 1. A filter screen plate 3-4 is provided between the circulation chamber 3-3 and the recovery tank 1. An extension pipe 3-5 is connected to the lower end of the circulation connector 3-1. An interception screen cover 3-6 is opened on the side wall of the extension pipe 3-5.

[0041] The overheated connector assembly 4 includes an overheated connector 4-1, which is located at opposite ends of the recovery tank 1. An insert rod 4-2 is provided inside the overheated connector 4-1. An insert sleeve 4-3 is fitted on the insert rod 4-2. A push spring 4-4 ​​is provided on the insert rod 4-2. The end of the insert rod 4-2 is fixedly connected to the inner wall of the overheated connector 4-1. A positioning block 4-5 is provided at the end of the insert sleeve 4-3. The end of the push spring 4-4 ​​is connected to the positioning block 4-5.

[0042] In some examples, the recovery tank 1 serves as the core container for waste heat recovery, with its bottom support platform 2 providing stable support. The support platform 2 is typically made of metal, such as steel, and is firmly fixed to the bottom of the recovery tank 1 by welding or bolting. The height and structural design of the support platform 2 need to be determined according to the actual installation environment and requirements to ensure that the recovery tank 1 is in a suitable working position, facilitating the connection and operation of subsequent components. The circulation joint 3-1 is located on the upper end face of the recovery tank 1 and is connected to the recovery tank 1 by welding or sealing thread connection to ensure the sealing of the connection and prevent heat loss and media leakage. The circulation joint 3-1 is used to connect to the external circulation pipeline to realize the circulation flow of the heat exchange medium. A partition plate 3-2 is installed inside the recovery tank 1, which divides the interior of the recovery tank 1 into different areas, helping to optimize the heat exchange process and media flow path. The partition plate 3-2 is generally made of corrosion-resistant and high-temperature resistant thin metal plate, such as stainless steel plate, and is fixed to the inner wall of the recovery tank 1 by welding or snap-fitting.

[0043] The circulation chamber 3-3 on the support platform 2 is connected to the recovery tank 1, which can be achieved by opening a connecting hole at the bottom of the support platform 2 and the recovery tank 1. The filter plate 3-4 installed between the circulation chamber 3-3 and the recovery tank 1 can effectively filter impurities in the heat exchange medium and ensure the normal operation of the system. The filter plate 3-4 is usually made of metal filter screen, and its mesh size is determined according to the size and properties of impurities in the medium. It is fixed to the connection between the circulation chamber 3-3 and the recovery tank 1 by a slot or bolt. The extension pipe 3-5 connected to the lower end of the circulation joint 3-1 can be fixed to the circulation joint 3-1 by welding or threaded connection. The side wall of the extension pipe 3-5 has an intercepting mesh cover 3-6, which is used to further filter small particles in the medium and prevent them from entering the circulation pipeline. The intercepting mesh cover 3-6 is generally made of metal wire mesh and is fixed to the side wall of the extension pipe 3-5 by welding or riveting. The overheating joint 4-1 is set at the opposite end of the recovery tank 1. Both ends are fixedly connected to the recovery tank 1 by welding or sealing flange connection to ensure the sealing and stability of the connection. The superheated joint 4-1 is used to connect the external superheated medium pipeline to realize the heat exchange between the superheated medium and the medium in the recovery tank 1. Installation of plug rod 4-2, plug sleeve 4-3 and push spring 4-4: The plug rod 4-2 is installed inside the superheated joint 4-1. One end of the plug rod 4-2 is fixedly connected to the inner wall of the superheated joint 4-1 by welding or threaded connection. The plug sleeve 4-3 is fitted on the plug rod 4-2. The plug sleeve 4-3 can slide freely on the plug rod 4-2. The push spring 4-4 ​​is set on the plug rod 4-2. One end of the push spring 4-4 ​​is fixedly connected to the end of the plug rod 4-2, and the other end is connected to the positioning block 4-5 at the end of the plug sleeve 4-3. When the external pipeline is inserted into the superheated joint 4-1, the plug sleeve 4-3 is tightly fitted to the external pipeline under the action of the push spring 4-4 ​​to achieve a sealed connection.

[0044] like Figures 1-4 As shown in the figure, this embodiment proposes that the inner wall of the extension tube 3-5 is provided with a connecting cone cover 3-7, and a connecting tube 3-8 is fixedly inserted inside the connecting cone cover 3-7. The connecting tube 3-8 is located inside the interception net cover 3-6.

[0045] In some examples, a connecting conical cover 3-7 is provided on the inner wall of the extension tube 3-5. The connecting conical cover 3-7 can be fixed to the inner wall of the extension tube 3-5 by welding or bonding. A connecting tube 3-8 is fixedly inserted inside the connecting conical cover 3-7. The connecting tube 3-8 is located inside the intercepting mesh cover 3-6 and is used to guide the flow direction of the heat exchange medium and improve the heat exchange efficiency. The connecting tube 3-8 and the connecting conical cover 3-7 are sealed together, such as by welding or sealing with sealant.

[0046] For example, such as Figure 2 As shown, the superheated connector 4-1 is internally connected to a superheated pipe 4-6, and the end of the superheated pipe 4-6 is connected to a branch pipe 4-7.

[0047] In some examples, the superheated connector 4-1 is internally connected to the superheated pipe 4-6. The superheated pipe 4-6 can be fixed to the superheated connector 4-1 by welding or threaded connection. The end of the superheated pipe 4-6 is connected to the branch pipe 4-7. The branch pipe 4-7 and the superheated pipe 4-6 are sealed to ensure the normal flow of the superheated medium. The branch pipe 4-7 passes through the partition plate 3-2 and is sealed to the partition plate 3-2 to prevent the superheated medium from leaking into other areas of the recovery tank 1. The intercepting mesh cover 3-6 passes through the gap of the branch pipe 4-7, so that the superheated medium and the medium in the recovery tank 1 can fully exchange heat near the branch pipe 4-7.

[0048] For example, such as Figure 2 As shown, the bifurcation pipe 4-7 has an O-shaped structure, and the intercepting net cover 3-6 passes through the interval of the bifurcation pipe 4-7.

[0049] In some examples, the branch pipe 4-7 has an O-shaped structure, and the number and direction of the branches of the branch pipe 4-7 can be set according to the actual heat exchange requirements.

[0050] For example, such as Figure 2 As shown, a secondary filter 5 is provided between the circulation chamber 3-3 and the partition plate 3-2, and the secondary filter 5 is compatible with the cross-sectional structure of the circulation chamber 3-3.

[0051] In some examples, a secondary filter 5 is installed between the circulation chamber 3-3 and the partition plate 3-2. The secondary filter 5 conforms to the cross-sectional structure of the circulation chamber 3-3 and can be fixed between the circulation chamber 3-3 and the partition plate 3-2 via a slot or frame. The secondary filter 5 further filters the medium entering the recovery tank 1 from the circulation chamber 3-3, improving the purity of the medium and ensuring the heat exchange effect. The secondary filter 5 can be made of a similar material and specifications as the filter plate 3-4, and should be cleaned or replaced periodically according to actual usage.

[0052] For example, such as Figure 1 As shown, a connecting flange 6 is provided on the upper end face of the circulation joint 3-1.

[0053] In some examples, the upper end face of the circulation joint 3-1 is provided with a connecting flange 6. The connecting flange 6 is fixed to the circulation joint 3-1 by welding or bolting. The connecting flange 6 is used to connect with the flange of the external circulation pipeline. The sealing connection is achieved by bolting, which facilitates the installation and disassembly of the circulation pipeline and makes the equipment maintenance and repair convenient.

[0054] For example, such as Figure 2 As shown, the branch pipe 4-7 passes through the partition plate 3-2, and the branch pipe 4-7 and the partition plate 3-2 are sealed and plugged together.

[0055] In operation, the working principle of the large temperature difference heat exchange waste heat recovery device mainly revolves around the flow and heat exchange between the heat exchange medium and the superheated medium within the device. The various components cooperate to achieve efficient waste heat recovery. The heat exchange medium enters the device through the circulation joint 3-1. Since the circulation joint 3-1 is connected to the upper surface of the recovery tank 1, the medium flows smoothly into the extension pipe 3-5. The connecting conical shroud 3-7 on the inner wall of the extension pipe 3-5 and the internal connecting pipe 3-8 play a crucial role. The connecting conical shroud 3-7 guides the medium flow to the connecting pipe 3-8, allowing the medium to flow more orderly and avoiding disordered flow. The energy loss caused by the movement is minimized. After passing through the connecting pipe 3-8, the medium flows out from the intercepting mesh cover 3-6 and enters the recovery tank 1. The intercepting mesh cover 3-6 performs preliminary filtration of impurities in the medium to prevent impurities from entering the recovery tank 1 and affecting the heat exchange effect and equipment operation. Inside the recovery tank 1, the partition plate 3-2 divides the space and guides the heat exchange medium to flow along a specific path. This helps to increase the residence time of the medium in the tank, allowing it to fully contact the superheated medium. At the same time, the superheated medium enters the superheated pipe 4-6 through the superheated joint 4-1. The branch pipe 4-7 connected to the end of the superheated pipe 4-6 has an O-shaped structure. The branch pipe 4-7 disperses the superheated medium to different areas in the recovery tank 1. The intercepting mesh cover 3-6 passes through the gaps in the branch pipe 4-7, so that the heat exchange medium and the superheated medium form a large contact area near the branch pipe 4-7. Due to the large temperature difference between the two, heat is transferred from the higher-temperature superheated medium to the heat exchange medium, realizing a highly efficient heat exchange process.

[0056] After heat exchange, the heat exchange medium returns through the circulation chamber 3-3. A filter plate 3-4, installed between the circulation chamber 3-3 and the recovery tank 1, performs secondary filtration to further remove impurities. When the medium flows through the secondary filter 5 between the circulation chamber 3-3 and the partition plate 3-2, it is purified again, ensuring a high purity of the medium entering the next cycle. The filtered medium returns to the circulation connector 3-1 to enter the next heat exchange cycle. The push spring 4-4 ​​and the plug-in sleeve 4-3 in the overheated plug-in assembly 4 play an important role in connecting the external overheated medium pipeline. When the external pipeline is inserted into the overheated connector 4-1, the plug-in... Under the elastic force of the push spring 4-4, the sleeve 4-3 tightly fits the external pipeline, ensuring the sealing of the connection and preventing leakage of the overheated medium. This ensures that the overheated medium can flow stably into the device to participate in the heat exchange process. The connecting flange 6 on the upper end of the circulation joint 3-1 facilitates connection and disassembly with the external circulation pipeline, making it convenient for equipment installation, commissioning, and subsequent maintenance. Through the coordinated work of this series of components, the large temperature difference heat exchange waste heat recovery device achieves large temperature difference and high efficiency waste heat recovery, converting potentially wasted waste heat into usable energy, reducing energy consumption, and improving energy utilization.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A waste heat recovery device for large temperature difference heat exchange, characterized in that, include: A recycling tank (1) is provided with a support platform (2) at its bottom; A heat exchange circulation assembly (3) is disposed inside the recovery tank (1); Overheated plug-in assembly (4), the overheated plug-in assembly (4) is disposed on opposite sides of the recovery tank (1); The heat exchange circulation assembly (3) includes a circulation connector (3-1), which is connected to the upper end face of the recovery tank (1). A partition plate (3-2) is provided inside the recovery tank (1). A circulation chamber (3-3) is opened on the support platform (2). The circulation chamber (3-3) is connected to the recovery tank (1). A filter screen plate (3-4) is provided between the circulation chamber (3-3) and the recovery tank (1). An extension pipe (3-5) is connected to the lower end of the circulation connector (3-1). An intercepting mesh cover (3-6) is opened on the side wall of the extension pipe (3-5).

2. The waste heat recovery device for large temperature difference heat exchange according to claim 1, characterized in that, The inner wall of the extension tube (3-5) is provided with a connecting cone cover (3-7), and a connecting tube (3-8) is fixedly inserted inside the connecting cone cover (3-7). The connecting tube (3-8) is located inside the interception net cover (3-6).

3. The waste heat recovery device for large temperature difference heat exchange according to claim 1, characterized in that, The overheated connector assembly (4) includes an overheated connector (4-1), which is located at opposite ends of the recovery tank (1). An insertion rod (4-2) is provided inside the overheated connector (4-1). An insertion sleeve (4-3) is fitted on the insertion rod (4-2). A push spring (4-4) is provided on the insertion rod (4-2). The end of the insertion rod (4-2) is fixedly connected to the inner wall of the overheated connector (4-1). A positioning block (4-5) is provided at the end of the insertion sleeve (4-3). The end of the push spring (4-4) is connected to the positioning block (4-5).

4. The waste heat recovery device for large temperature difference heat exchange according to claim 3, characterized in that, The overheating joint (4-1) is internally connected to an overheating pipe (4-6), and the end of the overheating pipe (4-6) is connected to a branch pipe (4-7).

5. The waste heat recovery device for large temperature difference heat exchange according to claim 4, characterized in that, The bifurcation pipe (4-7) has an O-shaped structure, and the intercepting net cover (3-6) passes through the interval of the bifurcation pipe (4-7).

6. The waste heat recovery device for large temperature difference heat exchange according to claim 1, characterized in that, A secondary filter (5) is provided between the circulation chamber (3-3) and the partition plate (3-2), and the secondary filter (5) is compatible with the cross-sectional structure of the circulation chamber (3-3).

7. The waste heat recovery device for large temperature difference heat exchange according to claim 1, characterized in that, The upper end face of the circulation joint (3-1) is provided with a connecting flange (6).

8. The waste heat recovery device for large temperature difference heat exchange according to claim 4, characterized in that, The branch pipe (4-7) penetrates the partition plate (3-2), and the branch pipe (4-7) and the partition plate (3-2) are sealed together.

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