Heat recovery device of vacuum turbine

Abstract

The invention discloses a heat recovery device of a vacuum turbine, and belongs to the technical field of heat recovery, the heat recovery device comprises a tubular heat exchanger, a vertical heat insulation plate is arranged in the tubular heat exchanger, and the vertical heat insulation plate divides the interior of the tubular heat exchanger into a heat exchange part and a fresh air part; a plurality of U-shaped heat exchange pipes are arranged in the heat exchange part, and a plurality of turbulent flow assemblies distributed at equal intervals are jointly arranged on the U-shaped heat exchange pipes. The blowing direction of the restraining plate is changed according to the temperature difference between fresh air and waste heat air, the flowing distance of waste air flow is increased, the flowing time of the waste heat air in the heat exchanger is changed, the purpose of sufficient heat exchange can be achieved through the limited length, and the heat energy recovery efficiency is guaranteed to reach the maximum efficiency. The conveying resistance of waste heat gas is reduced, the working power of waste gas conveying equipment is reduced, meanwhile, the possibility that paper lint is accumulated or attached is reduced, and the later maintenance cost and the cleaning time are saved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of heat recovery, and specifically provides a heat recovery device for a vacuum turbine. Background Art

[0002] In the paper industry, the drying of paper webs is mainly accomplished by drying with dryer cylinders and air hood air supply. When drying the paper web, the impact air flow formed by heating high-temperature hot air with a blower is directly sprayed onto the surface of the dryer fabric through the air duct to increase the dryness of the dryer fabric. Due to the high heat and low humidity of the hot air, and the relatively high flow rate, it can effectively break the water vapor boundary layer on the surface of the paper web and absorb the moisture in the paper web, achieving both drying and greatly reducing energy consumption; moreover, the paper web dried by hot air also has good softness. When the wet paper web is supported by the papermaking fabric and enters the drying device for drying operations, the pulp fibers in the wet paper web are hardly inhibited by external forces to generate internal stress during the whole process. Therefore, the form of the pulp fibers in the paper web always remains in the original loose state, so the dried paper web has good softness.

[0003] When drying paper, the hot air input from the outside enters the air hood and passes through the paper web. The hot air flow after drying the paper web is discharged from the air hood along the air duct and directly discharged into the air, which will cause waste of the remaining heat, fail to achieve the full utilization of energy, and cause waste of resources; for example, in the patent "A heat recovery device for a turbine (application number: 202321694687.4)", it realizes heat recovery through a turbine heat exchange module, but when specifically implementing heat recovery, only heat exchange pipes are used; for papers prepared from different materials, the required drying temperatures are also different, and the temperature of the fresh air introduced from the outside will also change due to weather changes, resulting in inconsistent temperature differences between the fresh air gas and the waste heat gas. If a shorter heat exchange pipe is used, the waste heat of the waste heat gas cannot be fully utilized. If a longer heat exchange pipe is used, the working time is lengthened and the gas transmission resistance becomes larger, resulting in waste of resources while avoiding waste of resources. Summary of the Invention

[0004] The technical solution of the present invention provides a solution significantly different from the prior art for the technical problem that the prior art solution is too single. Specifically, the present invention mainly provides a heat recovery device for a vacuum turbine to solve the technical problems proposed in the above background art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0006] A heat recovery device for a vacuum turbine includes a tubular heat exchanger, and a vertical heat insulation plate is arranged inside the tubular heat exchanger, and the vertical heat insulation plate divides the interior of the tubular heat exchanger into a heat exchange part and a fresh air part;

[0007] A number of U-shaped heat exchange tubes are arranged inside the heat exchange part. A number of spoiler components are arranged on the number of U-shaped heat exchange tubes at equal intervals. Each spoiler component includes an arc-shaped concave disc and a fixing ring. The arc-shaped concave disc is composed of an inner concave disc and an outer concave ring, and the inner concave disc and the outer concave ring are rotatably connected. Each U-shaped heat exchange tube is slidably connected to the inner concave disc. A number of sliders are slidably installed on the side surface of the outer concave ring, and the number of sliders are evenly distributed in a circle with the center of the arc-shaped concave disc as the center. A fan-shaped restraint plate is rotatably connected to each slider. The other end of the restraint plate is slidably clamped with a rotating ring, and the rotating ring and the fixing ring are rotatably connected. Ventilation holes are formed in each restraint plate;

[0008] A baffle is arranged between two adjacent restraint plates. Transmission plates are respectively slid on both sides inside the baffle. One side of the transmission plate is connected with a sliding block, and the sliding block is connected with the adjacent restraint plate. A chute for the sliding block to move is arranged on the surface of the baffle. A swing rod is rotatably installed between the two transmission plates, and an impact ball is installed at the lower end of the swing rod.

[0009] Preferably, a horizontal heat insulation plate is arranged inside the fresh air part, and the horizontal heat insulation plate divides the inside of the fresh air part into upper and lower parts. The inlets and outlets of each heat exchange tube are respectively connected to the upper and lower parts of the horizontal heat insulation plate. A fresh air inlet pipe and a fresh air outlet pipe are respectively arranged in the upper and lower parts of the fresh air part. A hot air inlet pipe and a hot air outlet pipe are arranged on the heat exchange part. Temperature sensors are arranged inside the fresh air inlet pipe and the hot air inlet pipe. The short line of the tube type heat exchanger is connected to a controller.

[0010] Preferably, a stabilizing frame is arranged at one end of the heat exchange part, and a partition plate is rotatably installed inside the stabilizing frame. The heat exchange tubes are located on one side of the partition plate. A reciprocating movement component and a motor are arranged on the other side of the partition plate. The reciprocating movement component includes a mounting frame, a reciprocating movement plate slidably installed inside the mounting frame, and a rotating shaft rotatably installed inside the mounting frame. The rotating shaft and the reciprocating movement plate are slidably connected through a rotating rod. The output end of the motor is connected to the rotating shaft of the reciprocating movement component. An expansion rod is arranged between the eccentric position of the partition plate and the reciprocating movement plate, and both ends of the expansion rod are rotatably installed.

[0011] Preferably, a number of cleaning scraping rods are connected to one side of each rotating ring, and the number of cleaning scraping rods are evenly distributed in a circle with the center of the arc-shaped concave disc as the center.

[0012] Preferably, a storage tank is provided on the tubular heat exchanger. Inside the storage tank, a square cover, a trapezoidal cover, and a rectangular cover are provided. Inside the square cover, the trapezoidal cover, and the rectangular cover, a first electric push rod, a hydraulic rod, and a second electric push rod are respectively provided. The upper ends of the first electric push rod and the second electric push rod are both connected to pistons that slide inside the square cover and the rectangular cover, and oil liquid is stored above the pistons. The port of the square cover is connected to the port of the hydraulic rod and the port of the rectangular cover through a connecting pipe. A spring is built into the hydraulic rod, and the upper end of the hydraulic rod is connected to a sliding member that slides inside the trapezoidal cover.

[0013] Preferably, the sliding member includes a central plate connected to the hydraulic rod. Sliding plates are slidably connected to both sides of the central plate, and a spring is connected between the side of the central plate and the inner wall of the sliding plate.

[0014] Preferably, a pull rod is connected between two adjacent outer concave rings. An oil liquid rod is connected between one of the outer concave rings and the partition plate. The port of the trapezoidal cover is connected to the oil liquid rod through a connecting pipe. When the oil liquid inside the trapezoidal cover is sent into the oil liquid rod, the oil liquid rod shortens.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] (1) The initial temperatures of the fresh air gas and the waste heat gas are different, and the heat transfer times required are also different; according to the temperature difference between the two, the blowing direction of the restraint plate is changed, increasing the flow path of the waste gas airflow, changing the flow time of the waste heat gas inside the heat exchanger, so that a sufficient heat exchange can be achieved with a limited length. While ensuring the maximum efficiency of heat energy recovery, the resistance of the waste heat gas transportation is reduced, and the working power of the waste gas transportation equipment is reduced.

[0017] (2) The greater the temperature difference between the fresh air gas in the fresh air inlet pipe and the waste heat gas in the hot gas inlet pipe, the longer the heating time of the waste heat gas on the fresh air gas. However, at the same time, the greater the temperature difference, the better the heat conduction effect of the waste heat gas on the fresh air gas. Therefore, the greater the temperature difference, the greater the inclination degree of the restraint plate, and the longer the retention time of the waste heat gas inside the tubular heat exchanger. And as the temperature difference increases, the increase in the retention time of the waste heat gas inside the tubular heat exchanger gradually decreases, ensuring that the heat energy recovery can reach the maximum efficiency.

[0018] (3) The greater the degree of boundary turbulence of the tubular heat exchanger, the thinner the laminar flow on the surface of the heat exchange tube wall, resulting in a greater heat transfer coefficient and higher heat transfer efficiency. Constraining the movement direction of the waste heat gas flow in the direction of frequently impacting the heat exchange tubes increases the heat transfer coefficient and heat transfer efficiency, enabling sufficient heat transfer to be achieved even with a limited length, saving time, space, and cost, extending the service life. Moreover, through the continuous impact, acceleration, and deceleration of the air flow during its movement, there are almost no areas with slow or static air flow throughout the process, reducing the possibility of paper fluff accumulation or adhesion, saving post-maintenance costs and cleaning time, increasing the service life. The overall structure is not complex, with low manufacturing costs and good usage effects.

[0019] (4) While the gas is flowing, the motor starts, and through the reciprocating movement component, the partition plate is driven to rotate back and forth, causing each constraint plate to also rotate back and forth, further increasing the degree of turbulence of the waste heat gas. At the same time, there are no dead corners in the contact between the waste heat gas and the heat exchange tubes. Several cleaning scraping rods also swing back and forth to ensure that there is no paper fluff adhesion on the inner wall of the heat exchanger. Moreover, as each constraint plate rotates back and forth, the swing rod inside the baffle drives the impact ball to swing back and forth, hitting the transmission plate to achieve vibration, preventing paper fluff from adhering to the flow disturbance component. And as the inclination degree of the constraint plate increases, correspondingly, the inclination degree of the baffle also becomes larger, and the gap between two adjacent constraint plates also becomes larger, making it easier for paper fluff to adhere. Correspondingly, as the inclination degree of two adjacent constraint plates increases, it will drive the two transmission plates to move away from each other, increasing the swing amplitude of the swing rod, thereby increasing the impact force of the swing rod driving the impact ball and enhancing the vibration intensity to prevent paper fluff from adhering.

[0020] The present invention will be explained and described in detail below in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the tubular heat exchanger of the present invention;

[0022] Figure 2 It is a schematic internal structure diagram of the tubular heat exchanger of the present invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged view at A;

[0024] Figure 4 It is a schematic diagram of the local connection structure of multiple flow disturbance components of the present invention;

[0025] Figure 5 It is a partial front view schematic diagram of the flow disturbance component of the present invention;

[0026] Figure 6 It is a partial rear view schematic diagram of the flow disturbance component of the present invention;

[0027] Figure 7Schematic diagram of the internal structure of the storage box of the present invention;

[0028] Figure 8 Schematic diagram of the internal structure of the baffle of the present invention.

[0029] In the figure:

[0030] 101, tube heat exchanger; 102, vertical heat insulation board; 103, heat exchange part; 104, fresh air part; 105, fresh air inlet pipe; 106, fresh air outlet pipe; 107, hot air inlet pipe; 108, hot air outlet pipe; 109, heat exchange tube; 110, horizontal heat insulation board;

[0031] 201, concave disk; 202, outer concave ring; 203, fixed ring; 204, restraint plate; 205, rotating ring; 206, ventilation hole; 207, cleaning scraper rod; 208, baffle; 209, drive plate; 210, sliding block; 211, swing rod;

[0032] 301, storage box; 302, square cover; 303, trapezoidal cover; 304, rectangular cover; 305, first electric push rod; 306, hydraulic rod; 307, second electric push rod; 308, center plate; 309, sliding plate; 310, pull rod; 311, oil hydraulic rod;

[0033] 401, partition board; 402, reciprocating movement assembly; 403, motor; 404, telescopic rod. Detailed implementation manners

[0034] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] Please refer to the attached pictures Figure 1 and Figure 2 As shown, a heat recovery device for a vacuum turbine includes a tubular heat exchanger 101, wherein a vertical heat insulation board 102 is arranged inside the tubular heat exchanger 101, and the vertical heat insulation board 102 divides the inside of the tubular heat exchanger 101 into a heat exchange part 103 and a fresh air part 104; a horizontal heat insulation board 110 is arranged inside the fresh air part 104, and the horizontal heat insulation board 110 divides the inside of the fresh air part 104 into an upper and lower part, and the inlet and outlet of each heat exchange tube 109 are respectively connected to the upper and lower parts of the horizontal heat insulation board 110, and the upper and lower parts of the fresh air part 104 are respectively provided with a fresh air inlet pipe 105 and a fresh air outlet pipe 106, and the heat exchange part 103 is provided with a hot air inlet pipe 107 and a hot air outlet pipe 108, and the fresh air inlet pipe 105 and the hot air inlet pipe 107 are built-in with temperature sensors, and the tubular heat exchanger 101 is electrically connected to a controller. By setting up a controller, it is convenient to control the electrical components inside the tubular heat exchanger 101. The controller control circuit can be realized by simple programming by technicians in this field. It is common knowledge in this field and is only used without modification. Therefore, the control method and circuit connection will not be described in detail.

[0038] Please refer to the attached pictures Figure 1 - Figure 6 As shown, a plurality of U-shaped heat exchange tubes 109 are arranged inside the heat exchange part 103, and a plurality of equally spaced spoiler components are arranged on the plurality of U-shaped heat exchange tubes 109, and each spoiler component includes an arc-shaped concave disk and a fixed ring 203, and the arc-shaped concave disk is composed of an inner concave disk 201 and an outer concave ring 202, and the inner concave disk 201 and the outer concave ring 202 are rotatably connected, and each U-shaped heat exchange tube 109 is slidably connected to the inner concave disk 201, and a plurality of sliders are slidably installed on the side of the outer concave ring 202, and the plurality of sliders are equidistantly distributed in a circle with the axis of the arc-shaped concave disk as the center, and a fan-shaped constraint plate 204 is rotatably connected to each slider, and a rotating ring 205 is slidably clamped on the other end of the constraint plate 204, and the rotating ring 205 is rotatably connected to the fixed ring 203, and each constraint plate 204 is provided with a ventilation hole 206.

[0039] The external fresh air gas enters the upper half of the fresh air section 104 from the fresh air inlet pipe 105, and then enters the inside of the heat exchange tube 109. At the same time, the waste heat gas enters the heat exchange section 103 through the hot air inlet pipe 107. The fresh air gas and the waste heat gas exchange heat in the heat exchange section 103, and then the fresh air gas leaves the heat exchange tube 109 and enters the lower half of the fresh air section 104, and is finally discharged through the fresh air outlet pipe 106, and the waste heat gas is discharged through the hot air outlet pipe 108.

[0040] The waste heat gas enters the heat exchange part 103 and contacts the concave disc 201 and the outer concave ring 202. Due to the arc-shaped settings of the concave disc 201 and the outer concave ring 202, the waste heat gas will spread out and continuously flow towards the restraint plate 204, and then flow out through the ventilation holes 206 on the restraint plate 204. When the waste heat gas flow collides with the restraint plate 204, it will induce turbulence and eddy currents in the waste heat gas flow, improving the gas mixing effect. At the same time, since the restraint plate 204 is inclined and the ventilation holes 206 face the heat exchange tubes 109, the waste heat gas will flow towards the heat exchange tubes 109. The greater the degree of boundary turbulence, the thinner the laminar flow on the wall surface of the heat exchange tubes 109, resulting in a greater heat transfer coefficient and higher heat exchange efficiency. Constraining the movement direction of the waste heat gas flow in the direction of frequently impacting the heat exchange tubes 109 improves the heat transfer coefficient and heat exchange efficiency, enabling sufficient heat exchange to be achieved with a limited length, saving time, space, and cost, extending the service life, and through the continuous impact, acceleration, and deceleration of the gas flow during the flow process, there are almost no slow-flowing or static areas in the entire process, reducing the possibility of paper fluff accumulation or adhesion, saving the later maintenance cost and cleaning time, increasing the service life, with the overall structure not being complex, low manufacturing cost, and good use effect.

[0041] When the temperature sensor detects an increase in the gas temperature in the fresh air inlet pipe 105, it will cause the second electric push rod 307 to gradually contract through the controller. When the temperature sensor detects an increase in the gas temperature in the hot gas inlet pipe 107, it will cause the first electric push rod 305 to gradually extend; the greater the temperature difference between the fresh air in the fresh air inlet pipe 105 and the waste heat gas in the hot gas inlet pipe 107, the greater the extension distance of the hydraulic rod 306, causing more hydraulic oil in the trapezoidal cover 303 to be squeezed into the interior of the oil rod 311, making the oil rod 311 shorter and shorter; therefore, the greater the temperature difference between the fresh air in the fresh air inlet pipe 105 and the waste heat gas in the hot gas inlet pipe 107, the greater the moving distance of the oil rod 311 driving the outer concave ring 202, making the inclination degree of the restraint plate 204 larger, increasing the flow path of the waste gas flow, enabling sufficient heat exchange to be achieved with a limited length, ensuring maximum efficiency in heat energy recovery, while reducing the resistance of the waste heat gas transportation and reducing the working power of the waste gas transportation equipment, saving time, space, and cost, and extending the service life.

[0042] Please refer to the attached drawings with emphasis. Figure 2 - Figure 8As shown, a storage tank 301 is provided on the tubular heat exchanger 101. Inside the storage tank 301, a square cover 302, a trapezoidal cover 303, and a rectangular cover 304 are provided. A first electric push rod 305, a hydraulic rod 306, and a second electric push rod 307 are respectively provided inside the square cover 302, the trapezoidal cover 303, and the rectangular cover 304. Pistons sliding inside the square cover 302 and the rectangular cover 304 are connected to the upper ends of the first electric push rod 305 and the second electric push rod 307, and oil liquid is stored above the pistons. The port of the square cover 302 is connected to the port of the hydraulic rod 306 and the port of the rectangular cover 304 through a connecting pipe. A spring is built into the hydraulic rod 306, and a sliding member connected to the upper end of the hydraulic rod 306 slides inside the trapezoidal cover 303; the sliding member includes a central plate 308 connected to the hydraulic rod 306. Sliding plates 309 are slidably connected to both sides of the central plate 308, and springs are connected between the side of the central plate 308 and the inner wall of the sliding plate 309. Through the arrangement of the sliding plate 309, the central plate 308, and the spring, the effective extrusion of the oil liquid is ensured; a pull rod 310 is connected between two adjacent outer concave rings 202. An oil liquid rod 311 is connected between one of the outer concave rings 202 and the partition plate 401. The port of the trapezoidal cover 303 is connected to the oil liquid rod 311 through a connecting pipe. When the oil liquid inside the trapezoidal cover 303 is sent into the oil liquid rod 311, the oil liquid rod 311 shortens.

[0043] When the temperature sensor detects that the temperature of the gas in the fresh air inlet pipe 105 increases, it will cause the second electric push rod 307 to gradually contract through the controller. When the temperature sensor detects that the temperature of the gas in the hot air inlet pipe 107 increases, it will cause the first electric push rod 305 to gradually extend; the greater the temperature difference between the fresh air in the fresh air inlet pipe 105 and the waste heat gas in the hot air inlet pipe 107, the greater the extension distance of the hydraulic rod 306, so that more oil liquid in the trapezoidal cover 303 will be squeezed into the oil liquid rod 311, making the oil liquid rod 311 shorter and shorter; the greater the temperature difference, the longer the heating time of the waste heat gas to the fresh air. At the same time, the greater the temperature difference, the better the heat conduction effect of the waste heat gas to the fresh air. Therefore, the greater the temperature difference, the greater the inclination degree of the restraint plate 204, and the longer the retention time of the waste heat gas inside the tubular heat exchanger 101. And as the temperature difference increases, the increase amount of the retention time of the waste heat gas inside the tubular heat exchanger 101 gradually decreases.

[0044] Please refer to the attached drawings for emphasis Figure 2 - Figure 8As shown in the figure, a stabilizing frame is provided at one end of the heat exchange part 103, and a partition plate 401 is rotatably installed inside the stabilizing frame. The heat exchange tube 109 is located on one side of the partition plate 401, and a reciprocating movement component 402 and a motor 403 are provided on the other side of the partition plate 401. The reciprocating movement component 402 includes a mounting frame, a reciprocating movement plate slidably installed inside the mounting frame, and a rotating shaft rotatably installed inside the mounting frame. The rotating shaft and the reciprocating movement plate are slidably connected through a rotating rod. The output end of the motor 403 is connected to the rotating shaft of the reciprocating movement component 402. An expansion link 404 is provided between the eccentric position of the partition plate 401 and the reciprocating movement plate, and both ends of the expansion link 404 are rotatably installed. A plurality of cleaning scraping rods 207 are connected to one side of each rotating ring 205, and the plurality of cleaning scraping rods 207 are evenly distributed in a circumferential manner with the center of the arc-shaped concave disc as the center. The reciprocating movement component 402 is a mature existing technology and will not be elaborated here. When the motor 403 is started, the partition plate 401 is driven to rotate back and forth through the reciprocating movement component 402, so that each restraint plate 204 also rotates back and forth, further improving the turbulence degree of the waste heat gas, and at the same time ensuring that there is no contact dead angle between the waste heat gas and the heat exchange tube 109. The plurality of cleaning scraping rods 207 also swing back and forth accordingly, ensuring that there is no paper fluff adhesion on the inner wall of the heat exchanger.

[0045] A baffle 208 is provided between two adjacent restraint plates 204. Transmission plates 209 are respectively slid on both sides inside the baffle 208. A sliding block 210 is connected to one side of the transmission plate 209, and the sliding block 210 is connected to the adjacent restraint plate 204. A chute for the sliding block 210 to move is provided on the surface of the baffle 208. A swing rod 211 is rotatably installed between the two transmission plates 209, and an impact ball is installed at the lower end of the swing rod 211. Each restraint plate 204 rotates back and forth, so that the swing rod 211 inside the baffle 208 drives the impact ball to swing back and forth, and the impact on the transmission plate 209 realizes vibration, avoiding paper fluff adhesion on the flow disturbance component. And as the inclination degree of the restraint plate 204 increases, correspondingly, the inclination degree of the baffle 208 also becomes larger, and the gap between two adjacent restraint plates 204 also becomes larger, making it easier for paper fluff to adhere. Correspondingly, as the inclination degree of two adjacent restraint plates 204 becomes larger, it will drive the two transmission plates 209 to move away from each other, making the swing amplitude of the swing rod 211 larger, so that the impact force of the swing rod 211 driving the impact ball becomes larger, improving the vibration intensity and avoiding paper fluff adhesion.

[0046] Specific operation steps:

[0047] Fresh air enters through the fresh air inlet pipe 105, and waste heat gas enters through the waste heat gas inlet pipe 107. When the temperature sensor detects an increase in the temperature of the gas in the fresh air inlet pipe 105, it will cause the second electric push rod 307 to gradually contract through the controller. When the temperature sensor detects an increase in the temperature of the gas in the waste heat gas inlet pipe 107, it will cause the first electric push rod 305 to gradually extend; the greater the temperature difference between the fresh air in the fresh air inlet pipe 105 and the waste heat gas in the waste heat gas inlet pipe 107, the greater the extension distance of the hydraulic rod 306, causing more hydraulic oil in the trapezoidal cover 303 to be squeezed into the inside of the hydraulic oil rod 311, making the hydraulic oil rod 311 shorter and shorter. The hydraulic oil rod 311 drives the outer concave ring 202 to move, causing the inclination degree of the restraint plate 204 to gradually increase;

[0048] Fresh air enters from the fresh air inlet pipe 105 into the upper half of the fresh air section 104, and then enters the inside of the heat exchange pipe 109. At the same time, the waste heat gas will enter the heat exchange section 103 through the waste heat gas inlet pipe 107. When the waste heat gas enters the heat exchange section 103, it will contact the inner concave disk 201 and the outer concave ring 202. Due to the arc-shaped settings of the inner concave disk 201 and the outer concave ring 202, the waste heat gas will spread out and continuously flow towards the restraint plate 204, and then flow out through the ventilation holes 206 on the restraint plate 204. When the waste heat gas flow collides with the restraint plate 204, it will induce the waste heat gas flow to generate turbulence and eddy currents, improving the gas mixing effect. At the same time, due to the inclination of the restraint plate 204 and the ventilation holes 206 facing the heat exchange pipe 109, the waste heat gas will flow towards the heat exchange pipe 109. The fresh air and the waste heat gas exchange heat in the heat exchange section 103. Then the fresh air leaves the heat exchange pipe 109 and enters the lower half of the fresh air section 104, and finally is discharged through the fresh air outlet pipe 106, while the waste heat gas is discharged through the waste heat gas outlet pipe 108;

[0049] While the gas is flowing, the motor 403 starts, driving the partition plate 401 to rotate back and forth through the reciprocating movement assembly 402, causing each restraint plate 204 to also rotate back and forth, further increasing the turbulence degree of the waste heat gas, and at the same time ensuring that there are no contact dead spots between the waste heat gas and the heat exchange pipe 109. Several cleaning scraping rods 207 also swing back and forth accordingly, ensuring that there is no paper fluff adhesion on the inner wall of the heat exchanger. And as each restraint plate 204 rotates back and forth, the swing rod 211 inside the baffle 208 drives the impact ball to swing back and forth, hitting the transmission plate 209 to achieve vibration, preventing paper fluff from adhering to the flow disturbance component. And as the inclination degree of the restraint plate 204 increases, correspondingly, the inclination degree of the baffle 208 also increases, and the gap between two adjacent restraint plates 204 also increases, making it easier for paper fluff to adhere. Correspondingly, as the inclination degree of two adjacent restraint plates 204 increases, it will drive the two transmission plates 209 to move away from each other, increasing the swing amplitude of the swing rod 211, thereby increasing the impact force of the swing rod 211 driving the impact ball and improving the vibration intensity to prevent paper fluff from adhering.

[0050] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A heat recovery device for a vacuum turbine, comprising a tubular heat exchanger (101), characterized in that: A vertical heat insulation board (102) is arranged inside the tubular heat exchanger (101), and the vertical heat insulation board (102) divides the inside of the tubular heat exchanger (101) into a heat exchange portion (103) and a fresh air portion (104); A plurality of U-shaped heat exchange tubes (109) are disposed inside the heat exchange portion (103), and a plurality of equally spaced spoiler assemblies are disposed on the plurality of U-shaped heat exchange tubes (109), each spoiler assembly comprising an arc-shaped concave disk and a fixing ring (203), the arc-shaped concave disk comprising an inner concave disk (201) and an outer concave ring (202), and the inner concave disk (201) and the outer concave ring (202) are rotatably connected, and each of the U-shaped heat exchange tubes (109) is connected to the inner concave disk ( 201) is slidably connected, a plurality of sliders are slidably mounted on the side of the outer concave ring (202), and the plurality of sliders are equidistantly distributed around the circumference with the arc-shaped concave disk axis as the center, each of the sliders is rotatably connected to a fan-shaped constraint plate (204), the other end of the constraint plate (204) is slidably clamped to a rotating ring (205), the rotating ring (205) and the fixed ring (203) are rotatably connected, and each of the constraint plates (204) is provided with a ventilation hole (206); A baffle plate (208) is arranged between two adjacent constraint plates (204), transmission plates (209) are respectively slidably arranged on both sides of the baffle plate (208), a sliding block (210) is connected to one side of the transmission plate (209), and the sliding block (210) is connected to the adjacent constraint plate (204), a sliding groove for the sliding block (210) to move is arranged on the surface of the baffle plate (208), a swing rod (211) is rotatably installed between the two transmission plates (209), and an impact ball is installed at the lower end of the swing rod (211).

2. The heat recovery device for a vacuum turbine according to claim 1, characterized in that: A horizontal heat insulation board (110) is arranged inside the fresh air section (104), and the horizontal heat insulation board (110) divides the interior of the fresh air section (104) into two parts, an upper part and an lower part. The inlet and outlet of each heat exchange tube (109) are respectively connected to the upper and lower parts of the horizontal heat insulation board (110). The upper and lower parts of the fresh air section (104) are respectively provided with a fresh air inlet pipe (105) and a fresh air outlet pipe (106). The heat exchange section (103) is provided with a hot air inlet pipe (107) and a hot air outlet pipe (108). The fresh air inlet pipe (105) and the hot air inlet pipe (107) are provided with built-in temperature sensors. The tubular heat exchanger (101) is short-circuited with a controller.

3. The heat recovery device for a vacuum turbine according to claim 1, characterized in that: A stabilizing frame is provided at one end of the heat exchange portion (103), and a partition plate (401) is rotatably installed inside the stabilizing frame. The heat exchange tube (109) is located on one side of the partition plate (401), and a reciprocating assembly (402) and a motor (403) are provided on the other side of the partition plate (401). The reciprocating assembly (402) comprises a mounting frame, a reciprocating plate slidably installed inside the mounting frame, and a rotating shaft rotatably installed inside the mounting frame, and the rotating shaft and the reciprocating plate are slidably connected via a rotating rod. The output end of the motor (403) is connected to the rotating shaft of the reciprocating assembly (402). A telescopic rod (404) is provided between the eccentric position of the partition plate (401) and the reciprocating plate, and both ends of the telescopic rod (404) are rotatably installed.

4. The heat recovery device for a vacuum turbine according to claim 1, characterized in that: One side of each rotating ring (205) is connected to a plurality of cleaning scraper rods (207), and the plurality of cleaning scraper rods (207) are equidistantly distributed around the circumference of a circle with the axis of the arc-shaped concave disk as the center.

5. The heat recovery device for a vacuum turbine according to claim 1, characterized in that: The tubular heat exchanger (101) is provided with a storage box (301), and a square cover (302), a trapezoidal cover (303) and a rectangular cover (304) are provided inside the storage box (301). A first electric push rod (305), a hydraulic rod (306) and a second electric push rod (307) are provided inside the square cover (302), the trapezoidal cover (303) and the rectangular cover (304) respectively. The upper ends of the first electric push rod (305) and the second electric push rod (307) are both connected to pistons that slide inside the square cover (302) and the rectangular cover (304), and oil is stored above the pistons. The port of the square cover (302) is connected to the port of the hydraulic rod (306) and the port of the rectangular cover (304) through a connecting pipe. The hydraulic rod (306) has a built-in spring, and the upper end of the hydraulic rod (306) is connected to a sliding member that slides inside the trapezoidal cover (303).

6. The heat recovery device for a vacuum turbine according to claim 5, characterized in that: The sliding member comprises a central plate (308) connected to a hydraulic rod (306), sliding plates (309) are slidably connected to both sides of the central plate (308), and a spring is connected between the side edge of the central plate (308) and the inner wall of the sliding plate (309).

7. The heat recovery device for a vacuum turbine according to claim 5, characterized in that: A pull rod (310) is connected between two adjacent outer concave rings (202), an oil rod (311) is connected between one of the outer concave rings (202) and the partition plate (401), and a port of the trapezoidal cover (303) is connected to the oil rod (311) via a connecting pipe. When the oil inside the trapezoidal cover (303) is sent into the oil rod (311), the oil rod (311) is shortened.

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