A heat recovery system based on a turbine fan

Abstract

The present application relates to a heat recovery system based on a turbine blower, including a wet section of a paper machine, an exhaust component and a drying component; the exhaust component includes a turbine blower and a heat exchange box, a heat exchange chamber is provided in the heat exchange box, a heat exchange tube is provided in the heat exchange chamber, the drying component includes a blower and a drying cylinder, and the heat exchange chamber is connected to the drying cylinder through a pipeline; it also includes a control mechanism for controlling the opening and closing of the blower, the control mechanism includes a control box, two conductive sheets in the control box and a heat expansion body; one of the conductive sheets is electrically connected to the blower, and the other conductive sheet is electrically connected to a power line. By providing the heat expansion body and the conductive sheet, the blower can be controlled to open by the temperature change in the heat exchange chamber, so that when the temperature in the heat exchange chamber is low, the blower is not easy to open, and the air in the heat exchange chamber is kept in a non-flowing state, thereby accelerating the temperature in the heat exchange box to quickly rise to the required temperature before passing the drying to heat the drying cylinder, thereby reducing the preheating time of the drying cylinder.

Description

Technical Field

[0001] The present application relates to the field of papermaking technology, and in particular to a heat recovery system based on a turbine blower. Background Art

[0002] In the process of papermaking, after the wood is dispersed, heated and condensed into pulp, there is a large amount of water in the pulp. It is connected to the wet part of the paper machine through a water ring pump to form negative pressure and remove a large amount of water from the pulp. However, the efficiency of the water ring pump is low, and the energy consumption is large when it is used in large quantities. At present, turbine fans are used to generate negative pressure for the wet part of the paper machine. They have the advantages of high efficiency, can reduce total energy consumption, and save water compared to water ring pumps.

[0003] The invention patent application with application publication number CN113699819A discloses a heat recovery system based on a turbine blower, including a wet section of a paper machine and a turbine blower. The air outlet of the turbine blower is connected to a heat exchange box, and an air outlet is provided on the heat exchange box for the turbine blower to extract the exhaust gas from the wet section. The air outlet of the turbine blower is connected to the heat exchange box, and an air supply device is provided outside the heat exchange box to extract the air after heat exchange in the heat exchange box. The air outlet of the air supply device is connected to a drying cylinder for drying wet paper, and an air inlet is provided on the heat exchange box for dry air to enter. The air supply device is used to pass the heated and dried gas into the drying cylinder and heat the drying cylinder.

[0004] Regarding the above-mentioned related technologies, the system usually needs to preheat the drying cylinder when it starts operating. When the turbine fan drives the hot air to enter the connecting pipe in the heat exchanger box, the blower is usually turned on. However, since the temperature of the hot air just entering the heat exchanger box is not high at this time, the heating effect entering the drying cylinder is poor. Because the blower continuously sends the air in the workshop into the heat exchanger, the air temperature in the heat exchanger is slow to reach the required temperature, so that the drying cylinder needs to spend more time to preheat, and causes more heat loss, wasting thermal energy. Summary of the invention

[0005] In order to improve the problem of long preheating time of the drying cylinder, the present application provides a heat recovery system based on a turbine blower.

[0006] The present application provides a heat recovery system based on a turbine blower, which adopts the following technical solution:

[0007] A heat recovery system based on a turbine blower comprises a wet section of a paper machine, an exhaust assembly and a drying assembly; the exhaust assembly comprises a turbine blower and a heat exchange box, a heat exchange chamber is arranged in the heat exchange box, a heat exchange tube is arranged in the heat exchange chamber, the heat exchange tube is connected to the air outlet of the turbine blower, the air inlet of the turbine blower is connected to the wet section of the paper machine, and one end of the heat exchange tube away from the turbine blower is used for exhaust; an air inlet is provided on the heat exchange box, the drying assembly comprises a blower and a drying cylinder, the heat exchange chamber is connected to the drying cylinder through a pipeline, and the blower drives air to pass through the air inlet, the heat exchange chamber and the drying cylinder in sequence;

[0008] It also includes a control mechanism for controlling the opening and closing of the air blower, the control mechanism includes a control box, two conductive sheets in the control box, and a heat-expanding body; one of the conductive sheets is electrically connected to the air blower, and the other conductive sheet is electrically connected to the power line; the two conductive sheets are arranged vertically, the upper conductive sheet is fixed on the inner wall of the control box, and the lower conductive sheet is slidably arranged in the control box, the heat-expanding body is located below the two conductive sheets, and after the heat-expanding body is heated and expanded, it drives the lower conductive sheet to contact the upper conductive sheet, and the inner cavity of the control box is connected to the heat exchange cavity.

[0009] By adopting the above technical solution, when the heat recovery system is used, the turbine fan forms a negative pressure on the wet part of the paper machine, thereby removing most of the moisture in the pulp. The gas-liquid mixture sucked by the turbine fan is separated from the water vapor by the water vapor separator of the turbine fan, and a large amount of hot gas is generated. After separation, the liquid phase is discharged and the gas phase is passed into the heat exchange tube. When the system is just turned on and needs to be preheated, the two conductive sheets are separated from each other, so that the blower is in the closed state. By passing hot air into the heat exchange tube, the gas in the heat exchange box is heated. Because the gas in the heat exchange box is almost in a non-flowing state, the gas in the heat exchange box is quickly heated up;

[0010] When the gas temperature reaches a certain height, the heat expansion body expands due to the heat, pushing the conductive sheet below upward and making the two conductive sheets contact each other, so that the blower starts to work automatically. The temperature change in the heat exchange box makes the blower work, so that the blower does not need to be supervised manually or by setting a program;

[0011] After the blower starts working, it drives the hotter gas in the heat exchange box to the drying cylinder, causing the drying cylinder to heat up quickly, and then recycle the heat to save energy. The blower is controlled by the heat expansion body, so that at a certain temperature, the blower is turned on to pass the hotter air into the drying cylinder. On the one hand, the air in the heat exchange is in a non-flowing state at the beginning of heating, which speeds up the temperature rise in the heat exchange box, thereby reducing the preheating time of the drying cylinder and saving heat energy. In addition, when the blower is turned off, it can also save electricity, realizing the development concept of energy saving and environmental protection.

[0012] Optionally, the control box is provided with a vertical straight plate, and the straight plate divides the inner cavity of the control box into a control cavity and a drive cavity; the conductive sheet and the heat-expanding body are both located in the control cavity;

[0013] The control mechanism also includes a forced structure for controlling the contact of the conductive sheet, and the forced structure includes a control valve, a sliding sheet and a rotating plate; the sliding sheet is slidably arranged in the control cavity, and the heat-expanding body is arranged on the top surface of the sliding sheet; the middle part of the rotating plate is rotatably connected to the partition plate, the length direction of the rotating shaft of the rotating plate is perpendicular to the plate surface of the straight plate, and the length direction of the rotating shaft of the rotating plate is horizontal, one end of the rotating plate is located below the sliding sheet, and the other end of the rotating plate is located in the driving cavity;

[0014] The control valve comprises a screw head and a driving plate. A rotation groove is provided on the outer wall of the control box. The screw head is rotatably arranged in the rotation groove. The rotation axis of the screw head is parallel to the depth direction of the rotation groove. One end of the driving plate fixes the screw head, and the other end is located in the driving cavity.

[0015] When the screw head rotates to drive the driving plate to abut against the end of the rotating plate in the driving cavity and move downward, the end of the rotating plate in the control cavity moves upward, the sliding plate and the heat-expanded body slide upward, and the two conductive plates contact each other.

[0016] By adopting the above technical solution, when the system is under maintenance or overhaul, it is sometimes necessary to turn the blower to an open state. At this time, the maintenance personnel can turn the screw head to drive the drive plate away from the end of the screw head to press the end of the rotating plate located in the drive cavity, so that the rotating plate located in the end of the control cavity turns upward, and then lifts the sliding plate, so that the heated expansion body on the sliding plate lifts the conductive plate below, and the two conductive plates remain in contact, so that the blower can be used when the heat exchange box is not heated up, which is convenient for maintenance or overhaul.

[0017] Optionally, the control mechanism further comprises a partition plate for separating the two conductive sheets, the partition plate being slidably disposed in the driving cavity, the straight plate being provided with an opening for sliding the partition plate, and when the end of the partition plate slides to the partition cavity, the partition plate is located between the two conductive sheets;

[0018] A slot is formed through the inner wall of the driving cavity, and a connecting piece is fixed on the end of the partition plate in the driving cavity. The connecting piece is located outside the control box.

[0019] By adopting the above technical solution, a partition plate is set. When the partition plate is located between two conductive plates, the two conductive plates cannot contact each other even when the temperature inside the heat exchange box is high. The air blower can be shut down without turning off the power, making it convenient to control the start and stop of the air blower.

[0020] Optionally, the depth direction of the slot is the same as the depth direction of the rotating slot, the length direction of the slot extends from the center of the rotating slot toward the control cavity, and the length direction of the slot is the same as the extension direction of the gap between the two conductive plates; the connecting piece is a screw head, the partition plate is a driving plate, and the screw head is slidably arranged in the slot.

[0021] By adopting the above technical solution, the connecting piece is a screw head, and the partition plate is a driving plate. The screw head can slide in the slot, and the sliding direction is the direction away from or close to the control cavity. When the screw head slides, it drives the driving plate to slide in the driving cavity. When the length direction of the driving plate is the same as the length direction of the slot, the end of the driving plate away from the screw head faces the opening. When the driving plate slides into the control cavity, the driving plate is located between the two conductive sheets. The driving plate is driven to rotate and slide by the screw head, so as to control the forced release or separation of the two conductive sheets, which is convenient for the control of the blower.

[0022] Optionally, the screwing head includes a rotating plate and a screwing strip fixed on a side of the rotating plate away from the bottom of the rotating groove, and the length direction of the screwing strip is parallel to the length direction of the rotating plate.

[0023] By adopting the above technical solution, the length direction of the twist bar is set parallel to the length direction of the drive plate, so that the user can observe the twist bar to know the length direction of the drive plate in the drive cavity, so that when the end of the drive plate needs to be slid into the opening, the control plate can be easily aligned with the opening.

[0024] Optionally, a guide slope is provided at the end of the conductive sheet close to the driving cavity, and the guide slope is located on the side where the two conductive sheets are close to each other. Along the direction close to the driving cavity, the guide slopes on the two conductive sheets are inclined in the direction away from each other. When the two conductive sheets are in contact with each other, the opening is toward between the two guide slopes.

[0025] By adopting the above technical solution and setting the guiding slope, when the two conductive sheets are in contact with each other, after the driving plate slides into the control cavity, the end of the driving plate abuts against the two guiding slopes and slides between the two conductive sheets, so that when the two conductive sheets are in contact with each other, the driving plate can separate the conductive sheets conveniently.

[0026] Optionally, the heat-expanding body includes an outer shell and a heat-expanding substance in the outer shell, the outer shell is made of a tough material, and the outer shell seals and wraps the heat-expanding substance.

[0027] By adopting the above technical solution, the shell has toughness, which makes it easy for the shell to deform. When the heat-expandable substance shrinks, the volume of the heat-expandable body can be changed easily.

[0028] Optionally, the shell is made of silicone and the substance that expands when heated is gas.

[0029] By adopting the above technical solution, the silicone has good toughness and strength, making the shell not easy to break. Using gas as the heat-expanding substance makes the heat-expanding body have a larger range of volume change when heated, and at room temperature, the shell is in a relaxed state, leaving more space for the expansion of the gas, which is convenient for the volume change of the heat-expanding body. And the gas can be air, oxygen, nitrogen, carbon dioxide and other gases, making the material easy to obtain and reducing the material cost of the heat-expanding substance.

[0030] Optionally, the heat-expandable body expands to become a column with a rectangular cross-section, the length direction of the column is vertical, and the top of the column faces the conductive sheet.

[0031] By adopting the above technical solution, the shape of the column and the vertical length direction of the column make the length of the column shorter at room temperature, while after heating, the length of the column increases, making it easier to lift the conductive sheet.

[0032] Optionally, an anti-slip ring is circumferentially provided on the side wall of the top end of the heat-expandable body, and the anti-slip ring is in sliding contact with the inner wall of the control box.

[0033] By adopting the above technical scheme, the anti-slip ring has an anti-slip effect, because the anti-slip ring is located at the top of the heat-expanding body, and the friction between the anti-slip ring and the inner wall is relatively large. When the heat-expanding body is heated, the outer shell gradually bulges, making it difficult for the top of the column to slide up, but the top of the column can still slide slowly upward; when the lower conductive sheet is pushed up to contact the upper conductive sheet, the blower operates to send fresh air into the heat exchange cavity, causing the temperature to drop and the volume of the outer shell to shrink slightly, but due to the large friction between the anti-slip ring and the inner wall, the anti-slip ring is not easy to slide down immediately, that is, the setting of the anti-slip ring reduces the sensitivity of the growth or shortening of the top of the outer shell, and improves the contact stability of the two conductive sheets.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. By setting the heat expansion body and the conductive sheet, the blower can be turned on by controlling the temperature change in the heat exchange chamber. When the temperature in the heat exchange chamber is low, the blower is not easy to turn on, and the air in the heat exchange chamber is kept in a non-flowing state, thereby accelerating the temperature in the heat exchange box to quickly rise to the required temperature before the drying is introduced to heat the drying cylinder, thereby reducing the preheating time of the drying cylinder;

[0036] 2. By setting the screw head, driving plate, rotating plate and sliding plate, the connection between the blower and the power supply can be kept unchanged during maintenance. The two conductive plates can be separated by the driving plate or the two conductive plates can be kept in contact after the sliding plate is driven up, so as to forcibly control the opening or closing of the blower, making maintenance or repair convenient;

[0037] 3. By setting an anti-slip ring, the contact stability of the two conductive sheets is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is an overall flow chart of the heat recovery system of the embodiment of the present application.

[0039] Figure 2 Schematic diagram of the heat exchange box of the embodiment.

[0040] Figure 3 yes Figure 1 Section along line AA.

[0041] Figure 4 yes Figure 3 An enlarged view of point B.

[0042] Figure 5 yes Figure 2 The cross-sectional view along line CC mainly shows the structure inside the control box.

[0043] Figure 6 It is a schematic diagram of the structure inside the control box.

[0044] Figure 7 1 is an overall schematic diagram of a control box of an embodiment.

[0045] Figure 8 yes Figure 7 The cross-section along line DD mainly shows the structure of the slot.

[0046] Description of the reference numerals: 1. wet section of paper machine; 2. exhaust assembly; 21. turbine fan; 22. heat exchange box; 221. heat exchange chamber; 222. heat exchange tube; 223. air inlet; 224. insulation layer; 3. drying assembly; 31. blower; 32. drying cylinder; 4. control mechanism; 41. control box; 411. rotating groove; 412. connecting shaft; 42. conductive sheet; 43. heat expansion body; 431. housing; 44. anti-slip ring; 45. strong Control structure; 451, control valve; 4511, screw head; 45112, round plate; 45113, screw bar; 4512, drive plate; 452, slide; 453, rotating plate; 46, straight plate; 461, straight groove; 462, opening; 47, partition; 48, connecting piece; 5, control cavity; 6, drive cavity; 7, slot; 71, second slide groove; 72, blind groove; 73, outer groove; 8, first slide groove; 9, guide slope; 10, matching slope. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1-8 This application is described in further detail.

[0048] The present application embodiment discloses a heat recovery system based on a turbine blower. Figure 1The heat recovery system based on the turbine fan 21 includes the wet section 1 of the paper machine, the exhaust component 2 and the drying component 3. The exhaust component 2 includes the turbine fan 21 and the heat exchange box 22. The turbine fan 21 is connected to the wet section 1 of the paper machine through a pipeline to form a negative pressure to remove a large amount of moisture from the pulp. The turbine fan 21 separates the gas-liquid mixture obtained by the suction through the gas-liquid separator provided by the turbine fan 21, and generates a large amount of hot air, which is then transported to the heat exchange box 22 to heat the gas in the heat exchange box 22.

[0049] Reference Figure 2 , Figure 3 The heat exchange box 22 is provided with a heat exchange chamber 221, and a heat exchange tube 222 is fixed in the heat exchange chamber 221. The heat exchange box 22 is provided with an air inlet 223 for external dry gas to enter, and the air inlet 223 is connected to the outside.

[0050] Reference Figure 1 , Figure 3 One end of the heat exchange tube 222 is connected to the air outlet of the turbine blower 21, and the other end is connected to the outside for exhaust.

[0051] Reference Figure 3 The outer wall of the heat exchange box 22 is fixed with an insulation layer 224, which is a polyurethane foam material. The insulation layer 224 reduces the heat dissipation of the outer wall of the heat exchange box 22 and reduces heat energy loss.

[0052] Reference Figure 1 , Figure 3 The drying assembly 3 includes a blower 31 and a drying cylinder 32. The drying cylinder 32 is connected to the heat exchange chamber 221 through a pipeline. The blower 31 is connected to the pipeline connecting the drying cylinder 32 and the heat exchange chamber 221. The blower 31 drives the heated dry air in the heat exchange chamber 221 to flow into the drying cylinder 32. When the drying cylinder 32 is working, the wet paper is closely attached to the surface of the drying cylinder 32, and the drying cylinder 32 dries the wet paper after heating.

[0053] Reference Figure 1 , Figure 4 The heat recovery system based on the turbine fan also includes a control mechanism 4 for controlling the opening and closing of the blower 31. The control mechanism 4 includes a control box 41, two conductive sheets 42 in the control box 41, and a heat expansion body 43. The control box 41 is fixed on the outer wall of the heat exchange box 22.

[0054] Reference Figure 3 , Figure 5 A straight plate 46 is fixed in the control box 41, and the plate surface of the straight plate 46 is in the vertical direction. The straight plate 46 divides the inner cavity of the control box 41 into a control cavity 5 and a drive cavity 6. The two conductive sheets 42 and the heat expansion body 43 are both located in the control cavity 5, and the control cavity 5 is connected to the heat exchange cavity 221.

[0055] Reference Figure 1 , Figure 5 , the two conductive sheets 42 are in a horizontal direction, the arrangement direction of the two conductive sheets 42 is in a vertical direction, and the heat-expanded body 43 is placed below the two conductive sheets 42. The upper conductive sheet 42 is fixed to the inner wall of the control chamber 5, and the lower conductive sheet 42 is placed above the heat-expanded body 43. One of the conductive sheets 42 is electrically connected to the air blower 31, and the other conductive sheet 42 is connected to a wire, which is used to connect to a power source. When the two conductive sheets 42 are in contact with each other, the air blower 31 is turned on after being connected to the power source, and when the two conductive sheets 42 are separated, the circuit of the air blower 31 is disconnected.

[0056] Reference Figure 5 The heat-expandable body 43 includes a shell 431 and a heat-expandable substance in the shell 431. The heat-expandable substance is a gas, which may be air, oxygen, nitrogen, carbon dioxide, etc. The shell 431 is made of soft silicone material, and the thickness of the shell 431 is 1-2 mm. The shell 431 seals and wraps the heat-expandable substance.

[0057] Reference Figure 5 After the heat expansion body 43 is heated and expanded, it becomes a column with a rectangular cross section, and the top of the column faces the conductive sheet 42. Under normal temperature, the housing 431 is in a relaxed state, and the two conductive sheets 42 are separated from each other. After heating, the top of the heat expansion body 43 rises, and after pushing up the conductive sheet 42 below, the two conductive sheets 42 are in contact.

[0058] Reference Figure 5 The top circumferential side wall of the column is fixed with an anti-skid ring 44, which is made of rubber. The rubber anti-skid ring 44 has a certain adhesion to the inner wall of the control chamber 5, so that the inner wall of the control chamber 5 and the anti-skid ring 44 have a greater friction performance, thereby achieving an anti-skid effect. The thickness of the anti-skid ring 44 is 1-2mm, and the anti-skid ring 44 also has a certain supporting performance, so that the anti-skid ring 44 maintains sliding contact on the inner wall of the control chamber 5.

[0059] Reference Figure 5 , Figure 6 The control mechanism 4 further includes a force structure 45 for controlling the contact of the conductive sheet 42, and the force structure 45 includes a control valve 451, a slide 452 and a rotating plate 453. The slide 452 is located below the heat-expanded body 43, and the slide 452 is slidably arranged in the control chamber 5, and the sliding direction of the slide 452 is the vertical direction.

[0060] Reference Figure 5 , Figure 6A straight groove 461 is provided on the straight plate 46, the middle part of the rotating plate 453 is rotatably connected to the inner wall of the straight groove 461, one end of the rotating plate 453 is located in the control cavity 5 and below the slide 452, and the other end of the rotating plate 453 is located in the driving cavity 6. The length direction of the rotating shaft of the rotating plate 453 is horizontal, and the length direction of the rotating shaft of the rotating plate 453 is parallel to the plate surface of the straight plate 46.

[0061] Reference Figure 6 , Figure 7 The control valve 451 includes a screw head 4511 and a driving plate 4512 . A rotation groove 411 is provided on the outer wall of the control box 41 , and the screw head 4511 is rotatably disposed in the rotation groove 411 .

[0062] Reference Figure 5 , Figure 6 The driving plate 4512 is located in the driving cavity 6, a connecting shaft 412 is fixed to the end of the driving plate 4512, the connecting shaft 412 is fixed to the screw head 4511, and the driving plate 4512 is coaxially fixed through the connecting shaft 412 and the screw head 4511.

[0063] Reference Figure 6 , Figure 8 , a first slide groove 8 for accommodating the end of the connecting shaft 412 is provided on the inner wall of the driving chamber 6 away from the rotating groove 411, and the end of the connecting shaft 412 away from the screw head 4511 is located in the first slide groove 8. The length of the connecting shaft 412 is parallel to the length direction of the rotating shaft of the rotating plate 453. The end of the rotating plate 453 located in the driving chamber 6 is located below the driving plate 4512. When the screw head 4511 rotates in the rotating groove 411, the end of the driving plate 4512 away from the screw head 4511 presses down the end of the rotating plate 453 located in the driving chamber 6, so that the sliding sheet 452 and the heat-expanded body 43 slide up, thereby keeping the two conductive sheets 42 in contact. The friction between the screw head 4511 and the rotating groove 411 makes it difficult for the screw head 4511 to rotate without the action of external force, thereby keeping the two conductive sheets 42 in contact.

[0064] Reference Figure 5 , Figure 6 The control mechanism 4 further includes a partition plate 47 and a connecting member 48. The partition plate 47 is slidably connected in the driving cavity 6. An opening 462 is provided on the straight plate 46 for the end of the partition plate 47 to slide into. When the two conductive sheets 42 are in contact, the position height of the connection seam between the two conductive sheets 42 is the same as the position height of the opening 462. The sliding direction of the partition plate 47 is the horizontal direction, and the position height of the partition plate 47 is the same as the position height of the opening 462.

[0065] Reference Figure 5 , Figure 6The connecting member 48 is fixed on the side wall of the end of the partition plate 47 away from the opening 462 . The connecting member 48 is the screw head 4511 , and the partition plate 47 is the driving plate 4512 .

[0066] Reference Figure 7 , Figure 8 A slot 7 is provided through the inner wall of the driving cavity 6, and the slot 7 includes a second slide groove 71 located on the inner wall of the driving cavity 6 for accommodating the end of the connecting shaft 412 near the screw head 4511, and the length directions of the first slide groove 8 and the second slide groove 71 are parallel.

[0067] Reference Figure 7 , Figure 8 The screw head 4511 includes a circular plate 45112 and a screw bar 45113 fixed to the circular plate 45112 on the side away from the bottom of the rotating groove 411. The slot 7 also includes a dark groove 72 and an outer groove 73. The dark groove 72 and the outer groove 73 are both provided on the side wall of the rotating groove 411. The dark groove 72 is for the circular plate 45112 to slide, and the outer groove 73 is for the screw bar 45113 to slide. The second slide groove 71, the dark groove 72 and the outer groove 73 are connected, and the length directions are parallel to each other. The outer groove 73 penetrates to the outer wall of the control box 41. The length directions of the dark groove 72 and the outer groove 73 are parallel to the sliding direction of the driving plate 4512.

[0068] Reference Figure 6 , Figure 7 , the length direction of the twisting strip 45113 is parallel to the length direction of the driving plate 4512, and the width of the outer groove 73 is the same as the width of the twisting strip 45113. When the twisting strip 45113 slides in the outer groove 73, the driving plate 4512 is in a horizontal direction.

[0069] Reference Figure 5 A guide slope 9 is provided on the side where the two conductive sheets 42 are close to each other, and the guide slope 9 is located at the end of the conductive sheet 42 close to the opening 462. Along the direction close to the driving cavity 6, the guide slopes 9 on the two conductive sheets 42 are inclined in a direction away from each other. When the two conductive sheets 42 are in contact with each other, the opening 462 is directed between the two guide slopes 9.

[0070] The implementation principle of a heat recovery system based on a turbine fan 21 in the embodiment of the present application is as follows: when the heat recovery system is just started, the turbine fan 21 sucks most of the moisture of the pulp at the wet part 1 of the paper machine, and separates it through the gas-liquid separator of the turbine fan 21, generating a large amount of hot air, and the turbine fan 21 passes the hot air into the heat exchange tube 222 to heat the air in the heat exchange chamber 221;

[0071] At the beginning, the temperature in the heat exchange cavity 221 is low, and the expansion degree of the heat expansion body 43 is small, so that the two conductive sheets 42 cannot be in contact, and the blower 31 remains closed. The air in the heat exchange cavity 221 hardly flows, and the heat exchange tube 222 continues to heat the air, so that the gas in the heat exchange cavity 221 quickly heats up, reducing heat waste;

[0072] When the air temperature in the control chamber 5 rises to a certain level, the heat expansion body 43 expands completely, causing the conductive sheet 42 below to press against the conductive sheet 42 above. The blower 31 is turned on to pass the hotter air in the heat exchange chamber 221 to the drying cylinder 32, causing the drying cylinder 32 to heat up quickly and increase the preheating speed.

[0073] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heat recovery system based on a turbine blower, comprising a wet section (1) of a paper machine, an exhaust component (2) and a drying component (3); the exhaust component (2) comprises a turbine blower (21) and a heat exchange box (22); a heat exchange chamber (221) is arranged in the heat exchange box (22); a heat exchange tube (222) is arranged in the heat exchange chamber (221); the heat exchange tube (222) is connected to an air outlet of the turbine blower (21); The air inlet is connected to the wet section (1) of the paper machine, and the end of the heat exchange tube (222) away from the turbine fan (21) is used for exhaust; the heat exchange box (22) is provided with an air inlet (223), the drying assembly (3) comprises a blower (31) and a drying cylinder (32), the heat exchange chamber (221) is connected to the drying cylinder (32) through a pipeline, and the blower (31) drives air to pass through the air inlet (223), the heat exchange chamber (221) and the drying cylinder (32) in sequence; Features: The device also includes a control mechanism (4) for controlling the opening and closing of the blower (31), the control mechanism (4) including a control box (41), two conductive sheets (42) in the control box (41), and a heat-expanding body (43); one of the conductive sheets (42) is electrically connected to the blower (31), and the other conductive sheet (42) is electrically connected to a power line; the two conductive sheets (42) are arranged vertically, the upper conductive sheet (42) is fixed on the inner wall of the control box (41), and the lower conductive sheet (42) is slidably arranged in the control box (41). The heat-expanding body (43) is located below the two conductive sheets (42); after the heat-expanding body (43) expands due to heat, it drives the conductive sheet (42) below to contact the conductive sheet (42) above; the inner cavity of the control box (41) and the heat exchange cavity (221) are connected; the control box (41) is provided with a vertical straight plate (46); the straight plate (46) divides the inner cavity of the control box (41) into a control cavity (5) and a drive cavity (6); the conductive sheet (42) and the heat-expanding body (43) are both located in the control cavity (5); The control mechanism (4) further comprises a forced structure (45) for controlling the contact of the conductive sheet (42), the forced structure (45) comprising a control valve (451), a sliding sheet (452) and a rotating plate (453); the sliding sheet (452) is slidably arranged in the control cavity (5), and the heat-expanding body (43) is arranged on the top surface of the sliding sheet (452); the middle part of the rotating plate (453) is rotatably connected to the partition plate (47), the length direction of the rotating shaft of the rotating plate (453) is perpendicular to the plate surface of the straight plate (46), and the length direction of the rotating shaft of the rotating plate (453) is horizontal, one end of the rotating plate (453) is located below the sliding sheet, and the other end of the rotating plate (453) is located in the driving cavity (6); The control valve (451) comprises a screw head (4511) and a driving plate (4512); a rotation groove (411) is provided on the outer wall of the control box (41); the screw head (4511) is rotatably arranged in the rotation groove (411); the rotation axis of the screw head (4511) is parallel to the depth direction of the rotation groove (411); one end of the driving plate (4512) is fixed with the screw head (4511), and the other end is located in the driving cavity (6); When the screw head (4511) rotates to drive the driving plate (4512) to abut against the end of the rotating plate (453) located in the driving chamber (6) and move downward, the rotating plate (453) located at the end of the control chamber (5) moves upward, the sliding plate (452) and the heat-expanding body (43) slide upward, and the two conductive plates (42) come into contact.

2. A heat recovery system based on a turbine blower according to claim 1, characterized in that: The control mechanism (4) further comprises a partition plate (47) for separating the two conductive sheets (42); the partition plate (47) is slidably disposed in the driving cavity (6); an opening (462) for the partition plate (47) to slide is provided on the straight plate (46); when the end of the partition plate (47) slides to the partition cavity, the partition plate (47) is located between the two conductive sheets (42); A slot (7) is provided through the inner wall of the driving chamber (6), a connecting piece (48) is fixed to the end of a partition plate (47) located in the driving chamber (6), and the connecting piece (48) is located outside the control box (41).

3. A heat recovery system based on a turbine blower according to claim 2, characterized in that: The depth direction of the slot (7) is the same as the depth direction of the rotating slot (411), the length direction of the slot (7) extends from the center of the rotating slot (411) toward the control cavity (5), and the length direction of the slot (7) is the same as the extension direction of the gap between the two conductive sheets (42); the connecting member (48) is a screw head (4511), the partition plate (47) is a driving plate (4512), and the screw head (4511) is slidably arranged in the slot (7).

4. A heat recovery system based on a turbine blower according to claim 3, characterized in that: The screwing head (4511) comprises a circular plate (45112) and a screwing bar (45113) fixed to a side of the circular plate (45112) away from the bottom of the rotating groove (411), and the length direction of the screwing bar (45113) is parallel to the length direction of the driving plate (4512).

5. A heat recovery system based on a turbine blower according to claim 4, characterized in that: A guiding slope (9) is provided at the end of the conductive sheet (42) close to the driving cavity (6); the guiding slope (9) is located on the side where the two conductive sheets (42) are close to each other; along the direction close to the driving cavity (6), the guiding slopes (9) on the two conductive sheets (42) are inclined in a direction away from each other; when the two conductive sheets (42) are in contact with each other, the opening (462) faces between the two guiding slopes (9).

6. A heat recovery system based on a turbine blower according to claim 1, characterized in that: The heat-expanding body (43) comprises an outer shell (431) and a heat-expanding substance in the outer shell (431); the outer shell (431) is made of a tough material, and the outer shell (431) seals and wraps the heat-expanding substance.

7. A heat recovery system based on a turbo blower according to claim 6, characterized in that: The shell (431) is made of silica gel, and the substance that expands when heated is gas.

8. A heat recovery system based on a turbo blower according to claim 7, characterized in that: After the heat-expanded body (43) expands, it becomes a column with a rectangular cross section, the length direction of the column is vertical, and the top of the column faces the conductive sheet (42).

9. A heat recovery system based on a turbo blower according to claim 8, characterized in that: An anti-slip ring (44) is circumferentially arranged on the side wall of the top end of the heat-expanded body (43), and the anti-slip ring (44) is in sliding contact with the inner wall of the control box (41).

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