Steam waste heat recycling system

Abstract

The invention discloses a steam waste heat recycling system which comprises an inner heat exchange pipe and an outer heat exchange sleeve which are coaxially arranged, an overflowing gap is formed between the inner heat exchange pipe and the outer heat exchange sleeve, an annular rotating shaft is arranged in the overflowing gap, the annular rotating shaft and the inner heat exchange pipe are coaxially arranged, and the inner heat exchange pipe and the outer heat exchange sleeve are coaxially arranged. A plurality of pneumatic swing pieces are arranged on the annular rotating shaft in a circumferential array mode, the middles of the pneumatic swing pieces are rotationally connected with the annular rotating shaft, rotating shaft columns are connected to the two ends of each pneumatic swing piece, the rotating shaft columns penetrate through the inner heat exchange pipe and the outer heat exchange sleeve to be connected with turbulent flow blades, and the rotating shaft columns are connected with the inner heat exchange pipe and the outer heat exchange sleeve. According to the heat exchanger, the pneumatic swing pieces capable of being driven by waste gas flow are arranged in the overflowing gaps, and the internal turbulent flow blades are linked to swing, so that a heat exchange medium forms dynamic stirring in a pipeline, the problem of uneven heating caused by traditional static heat exchange is effectively solved, and the heat exchange efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of energy recovery technology, specifically to a steam waste heat recovery and utilization system. Background Technology

[0002] In the papermaking industry, the drying process generates a large amount of high-temperature steam and waste gas, which typically needs to be discharged through closed pipelines. To make full use of this waste heat resource, existing technologies usually add heat exchange equipment to the exhaust pipeline, using a heat exchange medium (such as water or other liquids) to absorb the heat in the waste gas, thereby achieving energy recovery and utilization.

[0003] Traditional heat exchange equipment adds a heat exchange pipe with a heat exchange medium in the closed exhaust pipe. The heat exchange medium is exchanged with the steam with waste heat by flowing through the outer wall of the heat exchange pipe, thus forming the recovery and utilization of steam waste heat.

[0004] To improve heat exchange efficiency, an annular pipe is added outside the heat exchange pipe. When the exhaust gas flows out between the annular pipe and the heat exchange pipe, it can exchange heat with both the outer annular pipe and the inner heat exchange pipe simultaneously, thereby further improving the heat exchange efficiency of the equipment.

[0005] However, in practical applications, due to the large diameter of this type of heat exchange pipe, the liquid near the pipe wall can rapidly absorb heat, while the liquid in the center of the pipe heats up more slowly due to limitations in heat conduction. This results in poor heat exchange uniformity of the overall heat exchange medium. Especially during short-term exhaust gas emissions, this uneven heating of the heat exchange liquid leads to a decrease in overall heat exchange efficiency, making it impossible to fully recover the waste heat from the exhaust gas and causing energy waste. Summary of the Invention

[0006] The purpose of this invention is to provide a steam waste heat recovery and utilization system to solve the technical problem of low heat exchange efficiency caused by uneven heat exchange of the heat exchange medium in the prior art.

[0007] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0008] A steam waste heat recovery system includes an inner heat exchange tube and an outer heat exchange jacket. Both the inner and outer heat exchange tubes are filled with a heat exchange medium. The inner and outer heat exchange tubes are coaxially arranged, and a flow gap is formed between them.

[0009] An annular rotating shaft is provided in the flow gap. The annular rotating shaft is coaxially arranged with the inner heat exchange tube. Multiple wind-driven sway vanes are arranged in a circular array on the annular rotating shaft. The middle part of the wind-driven sway vanes is rotatably connected to the annular rotating shaft. The two ends of the wind-driven sway vanes swing around the annular rotating shaft.

[0010] Both ends of the wind-driven oscillating vane are connected to a rotating shaft column. The rotating shaft column passes through the inner heat exchange tube and the outer heat exchange sleeve and is connected to a turbulence blade. The turbulence blade is disposed inside the inner heat exchange tube and the outer heat exchange sleeve. The rotating shaft column is connected to the inner heat exchange tube and the outer heat exchange sleeve through a sealing elastic element 8.

[0011] As a preferred embodiment of the present invention, a steam storage tank and a pulsating fan are detachably connected to both ends of the flow gap, and the pulsating fan is intermittently started to accelerate the steam flow in the flow gap.

[0012] In a preferred embodiment of the present invention, the wind-driven oscillating plate includes an upper top plate, a lower bottom plate, and a connecting seat. The connecting seat is disposed between the upper top plate and the lower bottom plate for connecting the upper top plate and the lower bottom plate. The connecting seat is rotatably disposed on the annular rotating shaft.

[0013] As a preferred embodiment of the present invention, the wind-driven oscillating plate is provided with a plug-in assembly, and the upper top plate and the lower bottom plate are detachably connected to the turbulence blade through the plug-in assembly;

[0014] The upper top plate and the lower abutment plate are in line contact with the inner wall of the outer heat exchange sleeve and the outer wall of the inner heat exchange tube. The circular trajectory formed by the multiple upper top plates is attached to the inner wall of the outer heat exchange sleeve, and the circular trajectory formed by the multiple lower abutment plates is attached to the outer wall of the inner heat exchange tube.

[0015] After the wind-driven oscillating vane is disconnected from the turbulence-disrupting blade, the multiple wind-driven oscillating vanes can move linearly along the axial direction of the inner heat exchange tube to remove contaminants.

[0016] As a preferred embodiment of the present invention, the plug-in assembly includes a movable column groove formed in the upper top plate and the lower abutment plate, the movable column groove being disposed directly opposite the rotating shaft column, and a plug-in sleeve rod being axially slidably disposed in the movable column groove, the end of the plug-in sleeve rod having a plug-in groove for being movably sleeved on the outside of the rotating shaft column;

[0017] The movable column groove is connected to a limiting groove, and an elastic element is provided in the limiting groove. The elastic element is connected to a linkage plate, and the linkage plate is fixedly mounted on the plug-in sleeve rod.

[0018] The end of the plug-in sleeve away from the rotating shaft is connected to a pushing component, which is used to drive the plug-in sleeve to slide axially within the movable column groove.

[0019] In a preferred embodiment of the present invention, the pushing assembly includes a fixed seat, a screw, an active pusher, and a passive pusher. The fixed seat is fixedly mounted on the connecting seat. The end face of the fixed seat is connected to the screw in a threaded manner. The active pusher is fixedly connected to the end of the screw. The passive pusher is fixedly mounted at the end of the insertion sleeve. The active pusher presses against the passive pusher to push the insertion sleeve to slide toward the rotating shaft column.

[0020] As a preferred embodiment of the present invention, the surfaces of the upper top plate and the lower abutment plate are provided with connection positions, and the connection positions are movably connected to push handles. The push handles are used to drive the upper top plate and the lower abutment plate to slide against the inner wall of the outer heat exchange sleeve and the outer wall of the inner heat exchange tube.

[0021] As a preferred embodiment of the present invention, a limiting stop is provided on the outer wall of the inner heat exchange pipe. The limiting stop is located on one side of the lower abutment plate. When the wind-driven swing plate slides along the axial direction of the inner heat exchange pipe and comes into contact with the limiting stop, the insertion groove is positioned directly opposite the rotating shaft column.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention utilizes a fan-driven vane within the flow gap, which is activated by the exhaust gas flow, and coordinates with internal turbulence-inducing blades to create dynamic agitation of the heat exchange medium within the pipe. This effectively improves the uneven heating problem caused by traditional static heat exchange, significantly enhancing heat exchange efficiency. Simultaneously, the fan-driven vane can detach from the turbulence-inducing blades and slide along the outer wall of the pipe, effectively removing dirt adhering to the outer wall of the inner heat exchange tube and the inner wall of the outer heat exchange jacket. This prevents the heat exchange pipe from suffering reduced heat transfer performance due to scale buildup, cleans the pipe walls, extends pipe lifespan, and results in a higher energy efficiency and lower maintenance cost for the overall heat recovery system. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the end face structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the wind-driven pendulum of the present invention;

[0028] Figure 4 This is a schematic diagram of the cross-sectional structure of the present invention;

[0029] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 This is a front cross-sectional view of the wind-driven pendulum of the present invention.

[0031] The labels in the diagram represent the following:

[0032] 1. Inner heat exchange tube; 2. Outer heat exchange jacket; 3. Flow gap; 4. Annular rotating shaft; 5. Wind-driven oscillating vane; 6. Rotating shaft column; 7. Turbidator blades; 8. Sealing elastic element; 9. Straight groove; 10. Upper top plate; 11. Lower bottom plate; 12. Connecting seat; 13. Movable column groove; 14. Insertion sleeve rod; 15. Insertion groove; 16. Limiting groove; 17. Elastic element; 18. Linkage plate; 19. Pushing assembly; 20. Fixed seat; 21. Screw; 22. Active pusher head; 23. Passive pusher head; 24. Connection position; 25. Limiting stop. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 6 As shown, the present invention provides a steam waste heat recovery system, including an inner heat exchange tube 1 and an outer heat exchange jacket 2, which are coaxially arranged. Both the inner heat exchange tube 1 and the outer heat exchange jacket 2 are filled with a heat exchange medium (e.g., water or heat transfer oil). A flow gap 3 is formed between the inner heat exchange tube 1 and the outer heat exchange jacket 2, through which steam flows to transfer waste heat.

[0035] An annular rotating shaft 4 is installed within the flow gap 3, and is coaxially arranged with the inner heat exchange tube 1. Multiple aerodynamic vanes 5 are evenly arrayed along the circumference of the annular rotating shaft 4. Each aerodynamic vane 5 is rotatably connected to the annular rotating shaft 4 through its central portion, and its two ends can oscillate around the annular rotating shaft 4. A rotating shaft column 6 is connected to each end of the aerodynamic vane 5. The rotating shaft column 6 passes through the inner heat exchange tube 1 and the outer heat exchange sleeve 2, and is sealed to both the inner heat exchange tube 1 and the outer heat exchange sleeve 2 through a sealing elastic element 8 (e.g., a rubber sealing ring or a silicone sealing gasket) to prevent leakage of the heat exchange medium. Turbulence vanes 7 are connected to the end of the rotating shaft column 6. The turbulence vanes 7 are located inside the inner heat exchange tube 1 and the outer heat exchange sleeve 2, respectively, and are used to agitate the heat exchange medium, promoting mixing and heat transfer.

[0036] Among them, such as Figure 3 and Figure 5 As shown, the wind-driven oscillating vane 5 includes an upper top vane 10, a lower abutment vane 11, and a connecting seat 12. The connecting seat 12 is disposed between the upper top vane 10 and the lower abutment vane 11 to connect them. A rotating shaft column 6 is connected to the upper top vane 10 and the lower abutment vane 11, and the connecting seat 12 is rotatably mounted on an annular rotating shaft 4. When steam flows within the flow gap 3 and impacts the upper top vane 10 and the lower abutment vane 11, the connecting seat 12 rotates on the annular rotating shaft 4, thereby causing the turbulence-inducing blades 7 to oscillate through the upper top vane 10 and the lower abutment vane 11, thus agitating the heat exchange medium. Figure 3 As shown, notches are provided on both sides of the connecting seat 12 so that it is not connected to the annular rotating shaft 4, which allows the rotation of the wind-driven oscillating vane 5 to be smoother. The connecting seat 12 is relatively narrow, so an axial rotating shaft can be used to rotately connect with the connecting seat 12 at this connection section, thereby driving the wind-driven oscillating vane 5 to swing.

[0037] The rotating shaft 6 is rotatably connected to the inner heat exchange tube 1 and the outer heat exchange sleeve 2 via a sealing elastic element 8. Specifically, straight grooves 9 are formed on the bottom walls of the inner heat exchange tube 1 and the outer heat exchange sleeve 2, and the sealing elastic element 8 is disposed within the straight grooves 9. The sealing elastic element 8 serves two purposes: firstly, it seals the straight grooves 9 to prevent leakage of the internal heat exchange medium; secondly, it can be compressed by the swinging rotating shaft 6, preventing the sealing elastic element 8 from being too stiff and interfering with the rotation of the rotating shaft 6. Therefore, the sealing elastic element 8 can be a rubber sealing ring or a silicone sealing gasket, etc.

[0038] A steam storage tank and a pulsed blower (not shown in the figure) are detachably connected to both ends of the flow gap 3. A pneumatic oscillator 5 is positioned near the steam storage tank. The pulsed blower intermittently accelerates the steam flow within the flow gap 3. The two ends of the flow gap 3 are connected to the steam storage tank and the pulsed blower via detachable flange structures. The steam storage tank stores the industrial waste gas (steam) to be treated, while the pulsed blower periodically accelerates the steam flow within the flow gap 3 through intermittent startup. This allows the steam to remain within the flow gap 3, resulting in more thorough heat exchange for individual steam streams. Furthermore, the periodic acceleration of the airflow makes the pneumatic oscillator 5 swing more thoroughly and effectively. In practice, the startup cycle of the pulsed blower can be adjusted according to the steam flow rate and waste heat temperature, for example, starting every 10 seconds and running for 3 seconds each time to form a periodic airflow. This airflow drives the pneumatic oscillator 5 to swing around the annular shaft 4, which in turn drives the turbulence blades 7 to rotate in the heat exchange medium via the shaft column 6, enhancing the turbulence effect of the heat exchange medium and improving heat exchange efficiency.

[0039] Furthermore, in papermaking processes, the steam emitted contains various impurity particles, leading to a thick layer of fouling on the outer walls of the heat exchange tubes over long-term use, affecting heat exchange performance. Therefore, this invention further incorporates a plug-in assembly inside the pneumatic swing vane 5. This assembly detachably connects the upper top plate 10 and lower bottom plate 11 to the baffle blade 7. After a period of use, the steam storage chambers and pulsating fans at both ends of the flow gap 3 are removed. Then, the pneumatic swing vane 5 is disconnected from the baffle blade 7. By pushing the pneumatic swing vane 5 against the walls of the inner heat exchange tube 1 and the outer heat exchange sleeve 2, the adhered dirt is scraped off and discharged from the end.

[0040] Specifically, the surfaces of the upper top plate 10 and the lower bottom plate 11 form line contact with the inner wall of the outer heat exchange sleeve 2 and the outer wall of the inner heat exchange tube 1, respectively, to ensure that the upper top plate 10 and the lower bottom plate 11 can swing while adhering to the tube wall. The circular trajectory formed by multiple upper top plates 10 adheres to the inner wall of the outer heat exchange sleeve 2, and the circular trajectory formed by multiple lower bottom plates 11 adheres to the outer wall of the inner heat exchange tube 1, thus fully adhering to the outer wall of the pipe in an encircling manner, thereby making the cleaning range larger.

[0041] A plug-in assembly is used to enable quick-release connection with the spoiler blade 7. For example... Figure 5 and Figure 6As shown, the plug-in assembly specifically includes a movable slot 13, a plug-in sleeve 14, a limiting groove 16, and an elastic element 17. The movable slot 13 is formed within the upper top plate 10 and the lower abutment plate 11, directly opposite the rotating shaft 6. The plug-in sleeve 14 slides axially within the movable slot 13, and its end has a plug-in groove 15. The inner diameter of the plug-in groove 15 is slightly larger than the outer diameter of the rotating shaft 6, facilitating its movable fitting onto the outside of the rotating shaft 6. An elastic element 17 (e.g., a compression spring) is provided within the limiting groove 16. The elastic element 17 is fixedly connected to the plug-in sleeve 14 via a linkage plate 18 to provide a restoring force, ensuring a stable connection between the plug-in sleeve 14 and the rotating shaft 6.

[0042] like Figure 5 As shown, the end of the insertion sleeve 14 away from the rotating shaft column 6 is connected to a pushing assembly 19, which is used to drive the insertion sleeve 14 to slide axially within the movable groove 13.

[0043] The plug-in assembly moves axially via the plug-in sleeve 14 and is fitted onto the outside of the rotating shaft column 6 via the plug-in slot 15, thereby forming a connection between the upper top plate 10 or the lower bottom plate 11 and the spoiler blade 7. When it is necessary to disconnect the wind-driven oscillating blade 5 from the spoiler blade 7, the plug-in sleeve 14 is slid in the opposite direction to disengage it from the rotating shaft column 6, thus disconnecting the two and allowing the wind-driven oscillating blade 5 to move and clean the pipe body.

[0044] The drive of the plug-in assembly is implemented using the push-pull assembly 19. For example... Figure 5 As shown, the pushing assembly 19 includes a fixed base 20, a screw 21, an active pusher 22, and a passive pusher 23. The fixed base 20 is welded or bolted to the connecting base 12. The screw 21 is connected to the fixed base 20 by threads. The active pusher 22 is fixed to the end of the screw 21, and the passive pusher 23 is fixed to the end of the insertion sleeve 14. When disassembling the spoiler blade 7, by rotating the screw 21, the active pusher 22 presses against the passive pusher 23, pushing the insertion sleeve 14 to slide along the movable groove 13 away from the rotating shaft 6, thereby causing the insertion groove 15 to be fitted onto the outside of the rotating shaft 6. When the screw 21 rotates in the opposite direction, the active pusher 22 retracts, and the insertion sleeve 14 retracts under the action of the elastic element 17, completing the disconnection from the rotating shaft 6.

[0045] After disconnection, the fan-driven vane 5 can move linearly along the axis of the inner heat exchange tube 1 to remove dirt or deposits in the flow gap 3. For example, after the system has been running for a period of time, dust or particulate matter may accumulate in the flow gap 3. The operator can push the fan-driven vane 5 to slide axially and scrape off the dirt by means of the line contact characteristics of the upper top plate 10 and the lower bottom plate 11, thereby improving the cleanliness and operating efficiency of the system.

[0046] like Figure 5 As shown, the passive pusher 23 selects the inclined block, and the active pusher 22 pushes the inclined block to drive the insertion sleeve 14 to move axially.

[0047] An external push rod (not shown in the figure) can be used for the component that drives the axial movement of the pneumatic oscillating vane 5. In actual manufacturing, the number of pneumatic oscillating vanes 5 can be reduced, for example, to three. The surfaces of the upper top plate 10 and lower bottom plate 11 of the pneumatic oscillating vane 5 have connection positions 24. A pin structure or magnetic plate can be installed within the connection positions 24 to movably connect the push handle. The push handle is made of a high-temperature resistant and corrosion-resistant material (such as PTFE-coated metal). After the steam tank and pulse fan are disassembled, the operator inserts the external push handle into the connection position 24 and manually pushes the pneumatic oscillating vane 5 axially along the inner heat exchange tube 1 to the tail end, thereby scraping off the dirt on the tube wall. Simultaneously setting the connection positions 24 on the upper top plate 10 and lower bottom plate 11 allows the push handle to connect to both plates synchronously, preventing them from rotating during pushing and ensuring good contact with the tube wall. Furthermore, reducing the number of pneumatic oscillating vanes 5 in actual manufacturing improves operational efficiency.

[0048] Furthermore, to ensure that the insertion slot 15 is aligned with the rotating shaft column 6 when the wind-driven vane 5 moves axially and returns to its original position, a limiting stop 25 is provided on the outer wall of the inner heat exchange tube 1. The limiting stop 25 is an annular protrusion or baffle located on one side of the lower abutment plate 11. When the wind-driven vane 5 completes its wall scraping and slides back to contact the limiting stop 25, the insertion slot 15 is aligned with the rotating shaft column 6, facilitating reconnection with the turbulence blade 7 and ensuring assembly accuracy. The sealing elastic element 8 has a certain limiting capability. After the rotating shaft column 6 is disconnected from the wind-driven vane 5, it remains in a constant vertically downward position under the clamping and maintenance of the sealing elastic element 8, thus maintaining its position for better alignment with the insertion sleeve 14.

[0049] In actual operation, steam enters the flow gap 3 from the steam tank and forms a periodic accelerated flow under the action of the pulsed fan. The steam flow drives the pneumatic vane 5 to oscillate around the annular shaft 4, which in turn drives the turbulence blade 7 to rotate in the heat exchange medium through the shaft column 6. The rotation of the turbulence blade 7 disturbs the heat exchange medium, forming a turbulence effect, which significantly improves the mixing degree of the heat exchange medium and the heat transfer efficiency.

[0050] To facilitate long-term operation and maintenance of the system, a detachable connection structure is further provided. The steam storage tank and the pulse blower are connected by flanges for easy disassembly and maintenance. The pneumatic vane 5 and the turbulence blade 7 are quickly assembled and disassembled via a plug-in assembly. Operators can manually slide the pneumatic vane 5 by pushing the handle to perform decontamination work. The design of the limit stop 25 ensures precise alignment of the plug-in slot 15 and the rotating shaft column 6 during movement, improving maintenance efficiency.

[0051] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A steam waste heat recovery and utilization system, characterized in that, It includes an inner heat exchange tube (1) and an outer heat exchange sleeve (2), both of which are equipped with heat exchange medium. The inner heat exchange tube (1) and the outer heat exchange sleeve (2) are coaxially arranged, and a flow gap (3) is formed between the inner heat exchange tube (1) and the outer heat exchange sleeve (2). An annular rotating shaft (4) is provided inside the flow gap (3). The annular rotating shaft (4) is coaxially arranged with the inner heat exchange tube (1). Multiple wind-driven sway vanes (5) are arranged in a circular array on the annular rotating shaft (4). The middle part of the wind-driven sway vane (5) is rotatably connected to the annular rotating shaft (4). The two ends of the wind-driven sway vane (5) swing around the annular rotating shaft (4). Both ends of the wind-driven oscillating vane (5) are connected to a rotating shaft (6). The rotating shaft (6) passes through the inner heat exchange tube (1) and the outer heat exchange sleeve (2) and is connected to a turbulence blade (7). The turbulence blade (7) is disposed inside the inner heat exchange tube (1) and the outer heat exchange sleeve (2). The rotating shaft (6) is connected to the inner heat exchange tube (1) and the outer heat exchange sleeve (2) through a sealing elastic element (8).

2. The steam waste heat recovery and utilization system according to claim 1, characterized in that, The two ends of the flow gap (3) are respectively detachably connected to a steam storage tank and a pulse fan. The pulse fan is intermittently started to accelerate the steam flow in the flow gap (3).

3. A steam waste heat recovery and utilization system according to claim 2, characterized in that, The wind-driven oscillating plate (5) includes an upper top plate (10), a lower abutment plate (11), and a connecting seat (12). The connecting seat (12) is disposed between the upper top plate (10) and the lower abutment plate (11) for connecting the upper top plate (10) and the lower abutment plate (11). The connecting seat (12) is rotatably disposed on the annular rotating shaft (4).

4. A steam waste heat recovery and utilization system according to claim 3, characterized in that, The wind-driven sway (5) is provided with a plug-in assembly, and the upper top plate (10) and the lower bottom plate (11) are detachably connected to the turbulence blade (7) through the plug-in assembly; The upper top plate (10) and the lower abutment plate (11) are in line contact with the inner wall of the outer heat exchange sleeve (2) and the outer wall of the inner heat exchange tube (1). The circular trajectory formed by the multiple upper top plates (10) is attached to the inner wall of the outer heat exchange sleeve (2), and the circular trajectory formed by the multiple lower abutment plates (11) is attached to the outer wall of the inner heat exchange tube (1). After the wind-driven sway vane (5) is disconnected from the turbulence blade (7), the multiple wind-driven sway vanes (5) can move linearly along the axial direction of the inner heat exchange tube (1) to remove contaminants.

5. A steam waste heat recovery and utilization system according to claim 4, characterized in that, The plug-in assembly includes a movable column groove (13) formed in the upper top plate (10) and the lower abutment plate (11). The movable column groove (13) is set directly opposite the rotating shaft column (6). A plug-in sleeve rod (14) is axially slidably arranged in the movable column groove (13). The end of the plug-in sleeve rod (14) is provided with a plug-in groove (15) for movably fitting on the outside of the rotating shaft column (6). The movable column groove (13) is connected to a limiting groove (16), and an elastic element (17) is provided in the limiting groove (16). The elastic element (17) is connected to a linkage piece (18), and the linkage piece (18) is fixedly installed on the plug-in sleeve rod (14). The end of the plug-in sleeve (14) away from the rotating shaft (6) is connected to a pushing assembly (19), which is used to drive the plug-in sleeve (14) to slide axially in the movable column groove (13).

6. A steam waste heat recovery and utilization system according to claim 5, characterized in that, The pushing assembly (19) includes a fixed seat (20), a screw (21), an active pusher (22), and a passive pusher (23). The fixed seat (20) is fixedly mounted on the connecting seat (12). The end face of the fixed seat (20) is connected to the screw (21) by a threaded engagement. The end of the screw (21) is fixedly connected to the active pusher (22). The passive pusher (23) is fixedly mounted on the end of the plug-in sleeve (14). The active pusher (22) presses the passive pusher (23) to push the plug-in sleeve (14) to slide toward the rotating shaft (6).

7. A steam waste heat recovery and utilization system according to claim 6, characterized in that, The surfaces of the upper top plate (10) and the lower abutment plate (11) are provided with connection positions (24), and the connection positions (24) are movably connected with push handles. The push handles are used to drive the upper top plate (10) and the lower abutment plate (11) to slide against the inner wall of the outer heat exchange sleeve (2) and the outer wall of the inner heat exchange tube (1).

8. A steam waste heat recovery and utilization system according to claim 7, characterized in that, A limiting stop (25) is provided on the outer wall of the inner heat exchange tube (1). The limiting stop (25) is located on one side of the lower abutment plate (11). When the wind-driven swing plate (5) slides along the axial direction of the inner heat exchange tube (1) and comes into contact with the limiting stop (25), the insertion groove (15) is positioned directly opposite the rotating shaft column (6).

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