Heat recovery device for vacuum turbine

Abstract

The present invention discloses a heat recovery device for a vacuum turbine, belonging to the technical field of heat recovery, comprising a tubular heat exchanger, wherein a vertical heat insulation plate is arranged inside the tubular heat exchanger, and the vertical heat insulation plate divides the inside of the tubular heat exchanger into a heat exchange part and a fresh air part; a plurality of U-shaped heat exchange tubes are arranged inside the heat exchange part, and a plurality of equidistantly distributed turbulent components are commonly arranged on the plurality of U-shaped heat exchange tubes; the present invention changes the blowing direction of the constraint plate according to the temperature difference between the fresh air gas and the waste heat gas, thereby increasing the flow distance of the waste gas airflow and changing the flow time of the waste heat gas inside the heat exchanger, so that a limited length can also achieve the purpose of sufficient heat exchange, while ensuring that the heat energy recovery reaches the maximum efficiency, reducing the waste heat gas transmission resistance and reducing the working power of the waste gas transmission equipment, and at the same time reducing the possibility of paper fiber accumulation or adhesion, saving later maintenance costs and cleaning time.

Description

Technical Field

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

[0002] In the papermaking industry, paper webs are primarily dried using drying cylinders and hoods. During drying, high-temperature hot air, heated by a fan, forms an impinging airflow that is sprayed directly onto the surface of the drying fabric through blowpipes, improving the fabric's dryness. Due to its high heat content, low humidity, and high velocity, hot air effectively disrupts the water vapor boundary layer on the paper web's surface and removes moisture from the web, achieving both drying and significantly reducing energy consumption. Furthermore, paper webs dried with hot air exhibit excellent softness. When the wet paper web, supported by papermaking fabric, enters the drying apparatus for drying, the pulp fibers within the wet web are virtually free from external forces that generate internal stress. Consequently, the pulp fibers maintain their original loose shape, resulting in excellent softness after drying.

[0003] When drying paper, hot air input from the outside enters the air hood and passes through the paper web. After drying the paper web, the hot air flow is discharged from the air hood along the air duct and then directly discharged into the air, which will cause waste of residual heat, fail to achieve full energy utilization, and cause waste of resources; for example, the patent "A turbine heat recovery device (application number 202321694687.4)" realizes heat recovery through a turbine heat exchange module, but in the actual implementation of heat recovery, only heat exchange pipes are used; paper made of different materials requires different drying temperatures, and the temperature of the fresh air introduced from the outside will also change with 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 prolonged and the gas transmission resistance becomes greater, avoiding waste of resources while causing waste of resources. Summary of the Invention

[0004] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology. Specifically, the present invention mainly provides a heat recovery device for a vacuum turbine to solve the technical problems raised in the above background technology.

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

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

[0007] A plurality of U-shaped heat exchange tubes are arranged inside the heat exchange portion, and a plurality of equidistantly distributed spoiler components are commonly arranged on the plurality of U-shaped heat exchange tubes, and each of the spoiler components includes an arc-shaped concave disk and a fixed ring, and the arc-shaped concave disk is composed of an inner concave disk and an outer concave ring, and the inner concave disk and the outer concave ring are rotatably connected, and each of the U-shaped heat exchange tubes is slidably connected to the inner concave disk, and a plurality of sliders are slidably installed on the side of the outer concave ring, and the plurality of sliders are equidistantly distributed on the circumference with the axis of the arc-shaped concave disk as the center of the circle, and each of the sliders is rotatably connected to a fan-shaped constraint plate, and the other end of the constraint plate is slidably clamped with a rotating ring, and the rotating ring is rotatably connected to the fixed ring, and each of the constraint plates is provided with a ventilation hole;

[0008] A baffle is provided between each two adjacent constraint plates, and transmission plates are respectively slid on both sides of the inside of the baffle. A sliding block is connected to one side of the transmission plate, and the sliding block is connected to the adjacent constraint plate. A sliding groove for the sliding block to move is provided 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 board is provided inside the fresh air section, and the horizontal heat insulation board divides the interior of the fresh air section into two parts, the inlet and outlet of each heat exchange tube are respectively connected to the upper and lower parts of the horizontal heat insulation board, the upper and lower parts of the fresh air section are respectively provided with a fresh air inlet pipe and a fresh air outlet pipe, the heat exchange section is provided with a hot air inlet pipe and a hot air outlet pipe, the fresh air inlet pipe and the hot air inlet pipe are built-in temperature sensors, and the tubular heat exchanger is short-circuited and connected to a controller.

[0010] Preferably, a stabilizing frame is provided at one end of the heat exchange part, and a partition plate is rotatably installed inside the stabilizing frame, the heat exchange tube is located on one side of the partition plate, and a reciprocating assembly and a motor are provided on the other side of the partition plate, the reciprocating assembly includes a mounting frame, a reciprocating plate slidably installed inside the mounting frame, a rotating shaft rotatably installed inside the mounting frame, and the rotating shaft and the reciprocating plate are slidably connected through a rotating rod, the output end of the motor is connected to the rotating shaft of the reciprocating assembly, a telescopic rod is provided between the eccentric position of the partition plate and the reciprocating plate, and both ends of the telescopic rod are rotatably installed.

[0011] Preferably, one side of each rotating ring is connected to a plurality of cleaning scraping rods, and the plurality of cleaning scraping rods are equidistantly distributed around the circumference with the axis of the arc-shaped concave disk as the center.

[0012] Preferably, a storage box is provided on the tubular heat exchanger, and a square cover, a trapezoidal cover and a rectangular cover are provided inside the storage box. A first electric push rod, a hydraulic rod and a second electric push rod are respectively provided inside the square cover, the trapezoidal cover and the rectangular cover. The upper ends of the first electric push rod and the second electric push rod are connected to pistons sliding inside the square cover and the rectangular cover, and oil is stored above the pistons. The square cover port is connected to the hydraulic rod port and the rectangular cover port through a connecting pipe. The hydraulic rod has a built-in spring, and the upper end of the hydraulic rod is connected to a sliding part sliding inside the trapezoidal cover.

[0013] Preferably, the sliding member includes a center plate connected to the hydraulic rod, sliding plates are slidably connected to both sides of the center plate, and springs are connected between the side edges of the center plate and the inner wall of the sliding plate.

[0014] Preferably, a pull rod is connected between each adjacent outer concave ring, an oil rod is connected between one of the outer concave rings and the partition plate, and the trapezoidal cover port is connected to the oil rod through a connecting pipe. When the oil inside the trapezoidal cover is sent into the oil rod, the oil rod is shortened.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

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

[0017] (2) The greater the temperature difference between the fresh air in the fresh air inlet pipe and the waste heat gas in the hot air inlet pipe, the longer the waste heat gas heats the fresh air. 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. Therefore, the greater the temperature difference, the greater the inclination of the constraint plate, and the longer the waste heat gas stays inside the tubular heat exchanger. As the temperature difference increases, the increase in the waste heat gas stays inside the tubular heat exchanger gradually decreases, ensuring that the heat energy recovery can achieve 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, which makes the heat transfer coefficient larger and the heat transfer efficiency higher. The movement direction of the waste heat gas airflow is constrained to the direction of frequent impact on the heat exchange tube, which improves the heat transfer coefficient and heat transfer efficiency, so that the purpose of sufficient heat exchange can be achieved even with a limited length, saving time, space and cost, and extending the service life. In addition, through the continuous impact and acceleration and deceleration of the airflow during the flow, there is almost no slow flow or static area of ​​the airflow during the whole process, which reduces the possibility of paper hair accumulation or adhesion, saves the later maintenance cost and cleaning time, and increases the service life. The overall structure is not complicated, the manufacturing cost is low, and the use effect is good.

[0019] (4) While the gas is flowing, the motor starts and drives the partition plate to rotate back and forth through the reciprocating moving assembly, so that each constraint plate also rotates back and forth, further increasing the turbulence of the waste heat gas and at the same time making the waste heat gas and the heat exchange tube have no contact dead angle. Several cleaning scrapers also swing back and forth to ensure that there is no paper hair sticking to the inner wall of the heat exchanger. In addition, each constraint plate rotates back and forth, so that the swing rod inside the baffle drives the impact ball to swing back and forth, hitting the transmission plate to achieve vibration, and avoid the paper hair sticking to the spoiler assembly. Moreover, as the inclination of the constraint plate increases, the inclination of the baffle also increases accordingly, and the gap between the two constraint plates also increases, making it easier for paper hair to stick. Accordingly, the inclination of the two constraint plates increases, which will drive the two transmission plates to move back and forth, making the swing amplitude of the swing rod larger, thereby making the swing rod drive the impact force of the impact ball larger, increasing the vibration intensity, and avoiding the paper hair sticking.

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

[0021] Figure 1 Schematic diagram of the structure of the tubular heat exchanger of the present invention;

[0022] Figure 2 Schematic diagram of the internal structure of the tubular heat exchanger of the present invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a schematic diagram of the partial connection structure of multiple spoiler components of the present invention;

[0025] Figure 5 This is a partial schematic diagram of the front of the spoiler assembly of the present invention;

[0026] Figure 6 A partial schematic diagram of the back side of the spoiler assembly of the present invention;

[0027] Figure 7This is a schematic 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 picture:

[0030] 101. Tubular heat exchanger; 102. Vertical insulation board; 103. Heat exchange unit; 104. Fresh air unit; 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 insulation board;

[0031] 201, inner concave disc; 202, outer concave ring; 203, fixed ring; 204, restraining plate; 205, rotating ring; 206, ventilation hole; 207, cleaning scraper; 208, baffle; 209, transmission plate; 210, sliding block; 211, swing lever;

[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, hydraulic rod;

[0033] 401. Partition plate; 402. Reciprocating assembly; 403. Motor; 404. Telescopic rod. DETAILED DESCRIPTION

[0034] To facilitate 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 content disclosed in the present invention more thorough and comprehensive.

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

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly used by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention are for the purpose of describing specific embodiments only 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 drawings Figure 1 and Figure 2 As shown, a heat recovery device for a vacuum turbine includes a tubular heat exchanger 101. A vertical heat insulation board 102 is provided inside the tubular heat exchanger 101, and the vertical heat insulation board 102 divides the interior of the tubular heat exchanger 101 into a heat exchange section 103 and a fresh air section 104; a horizontal heat insulation board 110 is provided inside the fresh air section 104, and the horizontal heat insulation board 110 divides the interior of the fresh air section 104 into an upper and 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, and 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 equipped with built-in temperature sensors. 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 implemented 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 drawings Figure 1 - Figure 6 As shown, a number of U-shaped heat exchange tubes 109 are provided inside the heat exchange part 103, and a number of equally distributed spoiler components are commonly provided on the U-shaped heat exchange tubes 109, each spoiler component includes an arc-shaped concave disk and a fixed ring 203, 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, each U-shaped heat exchange tube 109 is slidably connected to the inner concave disk 201, and a number of sliders are slidably installed on the side of the outer concave ring 202, and the sliders are equidistantly distributed around the circumference with the axis of the arc-shaped concave disk as the center of the circle, each slider is rotatably connected to a fan-shaped constraint plate 204, and the other end of the constraint plate 204 is slidably clamped with a rotating ring 205, the rotating ring 205 and the fixed ring 203 are rotatably connected, and each constraint plate 204 is provided with a ventilation hole 206.

[0039] The outside 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 will enter the heat exchange section 103 through the hot air inlet pipe 107. The fresh air gas and the waste heat gas will 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] When the waste heat gas enters the heat exchange part 103, it will come into contact with the inner concave disk 201 and the outer concave ring 202. Due to the arc-shaped setting of the inner concave disk 201 and the outer concave ring 202, the waste heat gas will spread out and continuously flow toward the constraint plate 204, and then flow out through the ventilation holes 206 on the constraint plate 204. When the waste heat gas flow collides with the constraint plate 204, it will induce turbulence and eddy currents in the waste heat gas flow, thereby improving the gas mixing effect. At the same time, since the constraint plate 204 is tilted and the ventilation holes 206 are facing the heat exchange tube 109, the waste heat gas will flow toward the heat exchange tube 109. The greater the boundary turbulence, the higher the surface of the heat exchange tube 109 wall. The thinner the laminar flow on the surface, the greater the heat transfer coefficient and the higher the heat transfer efficiency. The movement direction of the waste heat gas airflow is constrained to the direction of frequent impact on the heat exchange tube 109, which improves the heat transfer coefficient and heat transfer efficiency, so that a limited length can also achieve the purpose of sufficient heat exchange, saving time, space and cost, and extending the service life. In addition, the airflow is constantly impacted and accelerated and decelerated during the flow. There is almost no slow flow or static area of ​​the airflow during the whole process, which reduces the possibility of paper hair accumulation or adhesion, saves later maintenance costs and cleaning time, and increases service life. The overall structure is not complicated, the manufacturing cost is low, and the use effect is good.

[0041] When the temperature sensor detects that the temperature of the gas in the fresh air inlet pipe 105 increases, the controller will gradually shrink the second electric push rod 307. When the temperature sensor detects that the temperature of the gas in the hot air inlet pipe 107 increases, the controller will gradually extend the first electric push rod 305. 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. This will squeeze more oil from the trapezoidal cover 303 into the oil rod 311, causing the oil to The rod 311 is getting shorter and shorter; therefore, when 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 is greater, the oil rod 311 drives the outer concave ring 202 to move a greater distance, so that the degree of inclination of the constraint plate 204 becomes greater, and the flow path of the waste gas airflow is increased, so that the purpose of sufficient heat exchange can be achieved even with a limited length, ensuring that the heat energy recovery reaches the maximum efficiency, while reducing the waste heat gas transmission resistance and the working power of the waste gas transmission equipment, saving time, space and cost, and extending the service life.

[0042] Please refer to the attached drawings Figure 2 - Figure 8As shown, a storage box 301 is provided on the tubular heat exchanger 101, 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 the A sliding member is connected to slide inside the trapezoidal cover 303; the sliding member includes a center plate 308 connected to the hydraulic rod 306, and sliding plates 309 are slidably connected on both sides of the center plate 308, and a spring is connected between the side of the center plate 308 and the inner wall of the sliding plate 309. The setting of the sliding plate 309, the center plate 308 and the spring ensures the effective squeezing of the oil; a pull rod 310 is connected between each two adjacent outer concave rings 202, and an oil 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 rod 311 through a connecting pipe. When the oil inside the trapezoidal cover 303 is sent into the oil rod 311, the oil rod 311 is shortened.

[0043] When the temperature sensor detects that the temperature of the gas in the fresh air inlet pipe 105 increases, the controller will gradually shrink the second electric push rod 307. When the temperature sensor detects that the temperature of the gas in the hot air inlet pipe 107 increases, the controller will gradually extend the first electric push rod 305. When 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 increases, the extension distance of the hydraulic rod 306 increases, so that more oil in the trapezoidal cover 303 will be squeezed into the oil rod 311, making the oil rod 311 shorter and shorter. The greater the temperature difference, the longer the waste heat gas heats the fresh air. But at the same time, the greater the temperature difference, the better the heat conduction effect of the waste heat gas on the fresh air. Therefore, the greater the temperature difference, the greater the inclination of the constraint plate 204, and the longer the waste heat gas stays in the tubular heat exchanger 101. And as the temperature difference increases, the increase in the waste heat gas stays in the tubular heat exchanger 101 gradually decreases.

[0044] Please refer to the attached drawings Figure 2 - Figure 8As shown, a stabilizing frame is provided at one end of the heat exchange portion 103, and a partition plate 401 is rotatably mounted 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 includes a mounting frame, a reciprocating plate slidably mounted inside the mounting frame, and a rotating shaft rotatably mounted inside the mounting frame. 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 mounted. Each rotating ring 205 is connected to one side of a plurality of cleaning scrapers 207, and the plurality of cleaning scrapers 207 are equidistantly distributed around the circumference of the arc-shaped concave disk axis. The reciprocating assembly 402 is a mature existing technology and will not be described in detail here. The motor 403 is started, and the reciprocating moving component 402 drives the partition plate 401 to rotate back and forth, causing each constraint plate 204 to rotate back and forth, further increasing the turbulence of the waste heat gas, while ensuring that there is no contact dead angle between the waste heat gas and the heat exchange tube 109. Several cleaning scrapers 207 also swing back and forth to ensure that there is no paper fiber sticking to the inner wall of the heat exchanger.

[0045] A baffle 208 is arranged between each adjacent constraint plate 204, and a transmission plate 209 is respectively slid on both sides of the inside of 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 constraint plate 204. A sliding groove 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. The restraining plates 204 rotate back and forth, causing the swinging rod 211 inside the baffle 208 to drive the impact ball to swing back and forth, and the impact transmission plate 209 to vibrate, thereby preventing paper fibers from sticking to the spoiler assembly. As the inclination of the restraining plates 204 increases, the inclination of the baffle 208 also increases accordingly, and the gap between the two restraining plates 204 also becomes larger, making it easier for paper fibers to stick. Correspondingly, the increasing inclination of the two restraining plates 204 will drive the two transmission plates 209 to move backwards, causing the swing amplitude of the swinging rod 211 to increase, thereby increasing the impact force of the impact ball driven by the swinging rod 211, thereby increasing the vibration intensity and preventing paper fibers from sticking.

[0046] Specific steps:

[0047] Fresh air enters the fresh air inlet pipe 105, and waste heat enters the hot air inlet pipe 107. When the temperature sensor detects that the temperature of the gas in the fresh air inlet pipe 105 increases, the controller will gradually contract the second electric push rod 307. When the temperature sensor detects that the temperature of the gas in the hot air inlet pipe 107 increases, the controller will gradually extend the first electric push rod 305. When 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 increases, the extension distance of the hydraulic rod 306 increases, so that more oil in the trapezoidal cover 303 is squeezed into the oil rod 311, making the oil rod 311 shorter and shorter. The oil rod 311 drives the outer concave ring 202 to move, so that the tilt degree of the restraining plate 204 gradually increases.

[0048] Fresh air enters the upper half of the fresh air section 104 from the fresh air inlet pipe 105, and then enters the interior 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. 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 setting of the inner concave disk 201 and the outer concave ring 202, the waste heat gas will spread out and continuously flow toward the constraint plate 204, and then flow through the ventilation holes 206 on the constraint plate 204. When the waste heat flow collides with the constraint plate 204, turbulence and eddy currents are induced in the waste heat flow, thereby improving the gas mixing effect. At the same time, due to the inclination of the constraint plate 204, the ventilation holes 206 face the heat exchange tube 109, allowing the waste heat gas to flow toward the heat exchange tube 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 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.

[0049] While the gas is flowing, the motor 403 is started, and the reciprocating moving component 402 drives the partition plate 401 to rotate back and forth, so that each constraint plate 204 also rotates back and forth, further increasing the turbulence of the waste heat gas, and at the same time making the waste heat gas and the heat exchange tube 109 have no contact dead angle, and a number of cleaning scrapers 207 also swing back and forth to ensure that there is no paper hair sticking to the inner wall of the heat exchanger, and each constraint 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 transfer tube 109 is formed. The movable plate 209 vibrates to prevent paper fibers from sticking to the spoiler assembly, and as the inclination of the constraint plate 204 increases, the inclination of the baffle 208 also increases accordingly, and the gap between the two constraint plates 204 also becomes larger, making it easier for paper fibers to stick. Accordingly, the increasing inclination of the two constraint plates 204 will drive the two transmission plates 209 to move back and forth, causing the swing amplitude of the swing rod 211 to increase, thereby increasing the impact force of the impact ball driven by the swing rod 211, improving the vibration intensity, and preventing paper fibers from sticking.

[0050] The above description of the present invention is exemplified in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made using 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 scope of protection 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 provided 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 provided inside the heat exchange portion (103), and a plurality of equally spaced spoiler assemblies are provided on the plurality of U-shaped heat exchange tubes (109). Each spoiler assembly comprises an arc-shaped concave disk and a fixing ring (203). The arc-shaped concave disk is composed of an inner concave disk (201) and an outer concave ring (202). The inner concave disk (201) and the outer concave ring (202) are rotatably connected. Each of the U-shaped heat exchange tubes (109) is connected to the inner concave disk ( 201) Sliding connection, 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 axis of the arc-shaped concave disk as the center, each of the sliders is rotatably connected to a fan-shaped constraint plate (204), and the other end of the constraint plate (204) is slidably engaged with a rotating ring (205), and 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 (208) is provided between two adjacent constraint plates (204), and transmission plates (209) are respectively slidably provided on both sides of the inside of the baffle (208), and 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 provided on the surface of the baffle (208), and 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). 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 at the partition. On one side of the partition plate (401), a reciprocating assembly (402) and a motor (403) are provided on the other side of the partition plate (401), the reciprocating assembly (402) including a mounting frame, a reciprocating plate slidably mounted inside the mounting frame, a rotating shaft rotatably mounted 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 mounted, and one side of each rotating ring (205) is connected to a plurality of cleaning scraping rods (20 7), a plurality of the cleaning scrapers (207) are equidistantly distributed around the circumference with the axis of the arc-shaped concave disk as the center of the circle, a storage box (301) is provided on the tubular heat exchanger (101), 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 the pistons Oil is stored on the top, and 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. The upper end of the hydraulic rod (306) is connected to a sliding member that slides inside the trapezoidal cover (303). 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). The port of the trapezoidal cover (303) is connected to the oil rod (311) through a connecting pipe. When the oil inside the trapezoidal cover (303) is sent into the oil rod (311), the oil rod (311) is shortened.

2. The heat recovery device for a vacuum turbine according to claim 1, characterized in that: A horizontal heat insulation board (110) is provided 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 equipped with built-in temperature sensors. The tubular heat exchanger (101) is short-circuited and connected to a controller.

3. The heat recovery device for a vacuum turbine according to claim 1, characterized in that: The sliding member includes a center plate (308) connected to a hydraulic rod (306), sliding plates (309) are slidably connected to both sides of the center plate (308), and springs are connected between the side edges of the center plate (308) and the inner wall of the sliding plate (309).

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