A glass fiber drying dehumidification and waste heat recovery device

Abstract

This invention discloses a waste heat recovery device for exhaust air in glass fiber drying, relating to the field of drying equipment technology. The device includes a frame, a rotary drying drum, an air guide hood, and a return air duct. This invention achieves waste heat recovery from the exhaust air in the rotary drying drum by combining indirect heat conduction through condensation dehumidification with direct circulation of the exhaust air. When the humidity in the exhaust air is high, low-temperature outside air is introduced through the air guide duct to condense and remove moisture from the exhaust air. The air heated during dehumidification is then guided to an insulation hood outside the rotary drying drum to maintain its temperature. When the humidity in the exhaust air is low, the exhaust air is directly introduced into a hot air circulation system, utilizing the high-heat exhaust air for further drying. This combination of two waste heat recovery methods maximizes the utilization of the waste heat from the exhaust air in the rotary drying oven.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and in particular to a waste heat recovery device for dehumidifying air during glass fiber drying. Background Technology

[0002] Fiberglass production is an energy-intensive industry. The drying process, as a core step in ensuring the mechanical properties and interfacial characteristics of the product, accounts for a significant portion of the overall production cost in terms of energy consumption. Rotary drying ovens (drum dryers), widely used for materials such as chopped filaments and ground fibers, achieve moisture evaporation and sizing agent curing through dynamic contact between high-temperature hot air and wet materials. During this process, to maintain a continuous and efficient drying drive, the system needs to constantly exhaust high-temperature, high-humidity process exhaust air and replenish it with fresh air for heating. Preliminary estimates suggest that the heat energy carried by this directly exhausted exhaust air accounts for approximately 30%-50% of the system's total heat consumption. Given the current backdrop of continuously rising global energy prices and the deepening implementation of the "dual-carbon" strategic goal, maximizing the recovery and utilization of this waste heat is no longer a dispensable optimization option, but an urgent and necessary measure for enterprises to reduce costs, increase efficiency, and achieve green and sustainable development.

[0003] Currently, the industry mainly relies on two technological approaches for the recovery and utilization of waste heat from the tail air of rotary dryers: One is the sensible heat recovery technology based on indirect heat exchange. This method uses plate heat exchangers, heat pipe heat exchangers, etc., to preheat the fresh air entering the burner or electric heater by using the heat of the exhaust air. It is essentially a sensible heat exchange and can only recover the limited heat released by the decrease in air temperature. The latent heat of vaporization contained in the water vapor in the exhaust air, which accounts for a large proportion, cannot be effectively recovered because it does not undergo a phase change, resulting in serious energy waste. In addition, the exhaust air, which is rich in glass fiber dust and volatile impregnating agents, is very easy to cause scaling, blockage and corrosion on the heat exchange surface. Not only is the maintenance cost high, but its heat exchange efficiency will also decrease rapidly with the operating time. The second method is the direct recycling of exhaust air. This method filters part of the exhaust air and mixes it directly into the fresh air system. The water vapor in the exhaust air is carried back to the drying system, causing the absolute humidity in the circulation path to accumulate continuously, which ultimately affects the drying of the glass fiber.

[0004] In summary, existing rotary drying ovens either suffer from limited efficiency and a lack of latent heat recovery, or face the dilemma of balancing recycling and humidity control. This urgently requires those skilled in the art to develop a new type of drying equipment that can more comprehensively, intelligently, and safely recover and utilize exhaust heat. Summary of the Invention

[0005] The purpose of this invention is to provide a waste heat recovery device for drying and dehumidifying glass fiber, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a waste heat recovery device for dehumidifying air during glass fiber drying, comprising: The frame has a drive gear that can rotate at the top center; A rotary drying drum is rotatably mounted on the top of the frame, and a ring gear that meshes with the drive gear is fixed in the middle of the outer side wall of the rotary drying drum. An air guide hood is fixedly mounted on one end of the upper surface of the frame and slidably attached to one end of the rotary drying cylinder. An air inlet hood is fixedly mounted on the top of the interior of the air guide hood. A hot air inlet and a return air outlet are fixedly mounted on one end of the air inlet hood via a tee. A return air hood is fixedly mounted on the middle of the side of the air guide hood near the rotary drying cylinder. An annular air guide pipe is fixedly mounted inside the return air hood. A connecting seat is fixedly mounted on one end of the return air hood. A filter hood is fixedly mounted on one side of the connecting seat. A connecting pipe is fixedly mounted on the top of the outer wall of the filter hood, and the connecting pipe is connected to the return air outlet via a valve. A return air duct is located inside the rotary drying cylinder. One end of the return air duct is fixedly equipped with a fixed cover, which is fixedly located inside the rotary drying cylinder and coincides with the position of the return air cover.

[0007] Preferably, the heat insulation cover is rotatably disposed on the outside of the rotary drying drum and fixedly disposed on the top of the frame; An insulated air duct is located between the insulation cover and the air guide duct. The air inside the insulated air duct is heated after exchanging heat with the exhaust air discharged from the rotary drying cylinder outside the air guide duct, and then enters the insulation cover to insulate the rotary drying cylinder.

[0008] Preferably, a circulating fan is fixedly installed on the outside of the air guide shroud. The input and output ends of the circulating fan are both connected to the heat-insulating air duct. The circulating fan is used to control the air circulation between the air guide duct and the heat-insulating shroud. A humidity sensor is fixedly installed at one end of the inner wall of the return air duct. The humidity sensor is used to detect the humidity of the exhaust air in the return air duct. When the detected value is higher than the preset humidity threshold, the circulating fan starts to drive the air in the duct to circulate and exchange heat with the exhaust air, so that some of the water vapor in the exhaust air condenses into water droplets and is discharged. When the detected value is lower than the preset humidity threshold, the circulating fan stops running and the exhaust air with residual heat is recirculated into the rotary drying cylinder.

[0009] Preferably, the heat exchange fins are provided in multiple and fixedly disposed on the outside of the air duct, and the heat exchange fins are used for heat exchange between the air inside the air duct and the exhaust air. An annular groove is provided on the inner wall of the return air shroud. The annular groove is used to guide the discharge of condensed water droplets on the surface of the heat exchange fins. A drainage trough is provided on the outer wall of the air guide shroud and its top end is connected to the annular groove. The drainage trough is used to drain the condensate that accumulates in the annular groove.

[0010] Preferably, the filter support is fixedly located in the middle of the side of the connecting seat near the filter cover; The filter cartridge is fixed at one end of the filter support and located inside the filter cover. The filter cartridge is used to filter dust particles in the exhaust air. The filter cover guides the filtered exhaust air with residual heat into the air inlet through the return air port to realize the reuse of the exhaust air.

[0011] Preferably, a mesh cylinder is fixedly installed at the end of the return air duct away from the air guide shroud and located inside the rotary drying cylinder. The mesh cylinder is used to prevent glass fibers from being discharged with the exhaust air.

[0012] Preferably, the air guide plates are provided in multiple sets and arranged around the outside of the fixed cover. The multiple air guide plates are staggered along the axis of the rotary drying cylinder, and an air guide channel is formed between two adjacent air guide plates. During the rotation of the rotary drying cylinder, the multiple air guide plates alternately overlap with the air inlet cover. The hot air in the air inlet cover alternately enters the rotary drying cylinder through the multiple air guide channels. The staggered arrangement of the multiple air guide plates allows the hot air to enter the rotary drying cylinder intermittently. The guide plates are provided in multiple ways and are fixedly installed on the inner wall of the rotary drying cylinder. The multiple guide plates are all designed with an arc shape, and one end of each guide plate corresponds to an air guide channel. The air guide channel is used to guide hot air to move along the surface of the guide plates in a spiral trajectory inside the rotary drying cylinder. The feed fork is provided in multiple sets and is fixedly installed on the outside of multiple guide plates. The feed fork is used to break up the glass fiber.

[0013] Preferably, the feeding hood is rotatably mounted on the top of the frame via a pin and slides against one end of the rotary drying cylinder. A feeding hopper is fixedly mounted on the top of the feeding hood, and a valve is mounted on the bottom of the feeding hopper. The rotary drying cylinder has multiple arc-shaped guide plates, all of which are arranged around the inner wall of the rotary drying cylinder near the end of the feeding hood. When the rotary drying cylinder rotates clockwise, the arc-shaped guide plates guide the glass fibers into the interior of the rotary drying cylinder. When the rotary drying cylinder rotates counterclockwise, the arc-shaped guide plates guide the glass fibers out.

[0014] Preferably, the drive motor is fixedly installed inside the frame, and the output shaft of the drive motor is connected to the drive gear through a transmission chain.

[0015] Preferably, the support wheels and circular guide rails are provided. The support wheels are provided in four rotatable positions at the top four corners of the frame, and the circular guide rails are provided in two sets and fixed at both ends of the rotary drying cylinder.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention achieves waste heat recovery from the exhaust air in the rotary drying drum by combining indirect heat conduction through condensation dehumidification with direct circulation of exhaust air. When the humidity in the exhaust air is high, low-temperature air from the outside is introduced through a duct to condense and remove the moisture in the exhaust air. The air heated during the dehumidification process is guided to the insulation cover outside the rotary drying drum to keep the drum warm. When the humidity in the exhaust air is low, the exhaust air is directly introduced into the hot air circulation system to continue drying using the high-heat exhaust air. The combination of these two waste heat recovery methods maximizes the utilization of the waste heat from the exhaust air of the rotary drying oven. 2. This invention dries glass fibers inside a rotary drying cylinder by using alternating air intake and spiral air guidance. The alternating air intake causes the glass fibers to move more rapidly due to the intermittent hot air as they rotate with the cylinder. By setting multiple sets of guide plates and forks inside the rotary drying cylinder, the guide plates and forks guide and disperse the glass fibers, further improving the heat exchange efficiency between the glass fibers and the hot air. Furthermore, when the hot air passes through the dispersed glass fibers, it can carry away more moisture, thereby accelerating the dehumidification efficiency of the device and ultimately improving the drying efficiency of the glass fibers. 3. This invention treats the exhaust air by combining external insulation with recycling. Part of the heat in the exhaust air is used for external insulation of the rotary drying cylinder to reduce the impact of heat loss on the drying efficiency of the device. The high-heat exhaust air enters the circulation directly after filtration to reduce the pressure of the hot air supply system. Furthermore, the high-heat exhaust air can accelerate the flow speed of the hot air after entering the circulation, thereby further improving the drying efficiency of glass fiber. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the rotary drying cylinder structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the internal structure of the rotary drying cylinder of the present invention.

[0021] Figure 5 This is a schematic diagram of the air guide cover structure of the present invention.

[0022] Figure 6 This is a schematic diagram showing the disassembled structure of the air guide cover of the present invention.

[0023] Figure 7 This is a cross-sectional schematic diagram of the air guide shroud structure of the present invention.

[0024] Figure 8 This is a schematic diagram of the internal structure of the air guide cover of the present invention.

[0025] Figure 9 This is a schematic diagram showing the disassembled structure of the filter cover of the present invention.

[0026] In the diagram: 1. Frame; 11. Drive gear; 12. Ring gear; 13. Drive motor; 14. Support wheel; 15. Circular guide rail; 2. Rotary drying cylinder; 21. Insulation cover; 22. Guide plate; 221. Material fork; 23. Arc guide plate; 3. Air guide hood; 31. Air inlet hood; 32. Hot air inlet; 33. Return air outlet; 34. Return air hood; 35. Air duct; 351. Heat exchange fins; 352. Insulated air duct; 353. Circulating fan; 3531. Humidity sensor; 354. Circular groove; 355. Drainage groove; 36. Connecting seat; 361. Filter support; 362. Filter cartridge; 37. Filter cover; 371. Connecting pipe; 4. Return air duct; 41. Fixing cover; 42. Mesh cylinder; 43. Air guide plate; 431. Air guide channel; 5. Feeding cover; 51. Feeding hopper. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 9 As shown, the waste heat recovery device for glass fiber drying exhaust air provided by the present invention essentially achieves waste heat recovery by combining indirect heat conduction through condensation dehumidification with direct circulation of exhaust air. When the humidity in the exhaust air is high, low-temperature air from the outside is introduced through the air guide pipe 35 to remove the moisture in the exhaust air by condensation. The air heated during the dehumidification process is guided to the heat insulation cover 21 on the outside of the rotary drying cylinder 2 to achieve heat preservation of the rotary drying cylinder 2. When the humidity in the exhaust air is low, the exhaust air is directly introduced into the hot air circulation system, and the high-heat exhaust air is used to continue the drying process. The combination of the two waste heat recovery methods maximizes the utilization of the waste heat of the exhaust air in the rotary drying cylinder 2.

[0029] In terms of specific structural installation, the structural body can be constructed according to the inventive concept of this embodiment. In this embodiment, no special limitations are imposed.

[0030] In this embodiment, a waste heat recovery device for glass fiber drying dehumidification includes: The frame 1 has a drive gear 11 that can be rotatably installed at the top center; The rotary drying cylinder 2 is rotatably mounted on the top of the frame 1, and a ring gear 12 that meshes with the drive gear 11 is fixedly provided in the middle of the outer side wall of the rotary drying cylinder 2. The drive motor 13 is fixedly installed inside the frame 1, and the output shaft of the drive motor 13 is connected to the drive gear 11 through a transmission chain. The support wheels 14 and circular guide rails 15 are provided. There are four support wheels 14, which are rotatably located at the four corners of the top of the frame 1. There are two sets of circular guide rails 15, which are fixed at both ends of the rotary drying cylinder 2. The support wheels 14 and circular guide rails 15 are used to ensure that the rotary drying cylinder 2 rotates smoothly. The heat insulation cover 21 is rotatably disposed on the outside of the rotary drying cylinder 2 and fixedly disposed on the top of the frame 1; The air guide hood 3 is fixedly mounted on one end of the upper surface of the frame 1 and slides against one end of the rotary drying cylinder 2. An air inlet hood 31 is fixedly mounted on the top inside the air guide hood 3. A hot air inlet 32 ​​and a return air outlet 33 are fixedly mounted on one end of the air inlet hood 31 through a tee. A return air hood 34 is fixedly mounted on the middle of the side of the air guide hood 3 near the rotary drying cylinder 2. An annular air guide pipe 35 is fixedly mounted inside the return air hood 34. A connecting seat 36 is fixedly mounted on one end of the return air hood 34. A filter hood 37 is fixedly mounted on one side of the connecting seat 36. A connecting pipe 371 is fixedly mounted on the top of the outer wall of the filter hood 37, and the connecting pipe 371 is connected to the return air outlet 33 through a valve. The heat-insulating air duct 352 is located between the heat-insulating cover 21 and the air guide duct 35. The air inside the heat-insulating air duct 352 is heated after exchanging heat with the exhaust air discharged from the rotary drying cylinder 2 outside the air guide duct 35, and then enters the heat-insulating cover 21 to keep the rotary drying cylinder 2 warm. The circulating fan 353 is fixedly installed on the outside of the air guide hood 3. The input and output ends of the circulating fan 353 are connected to the heat-insulating air duct 352. The circulating fan 353 is used to control the air circulation between the air guide duct 35 and the heat-insulating hood 21. Humidity sensor 3531 is fixedly installed on one end of the inner wall of return air duct 4. Humidity sensor 3531 is used to detect the humidity of the exhaust air in return air duct 4. When the detected value is higher than the preset humidity threshold, the circulating fan 353 is started to drive the air in the air duct 35 to circulate and make the air in the air duct 35 exchange heat with the exhaust air, so that some of the water vapor in the exhaust air condenses into water droplets and is discharged. When the detected value is lower than the preset humidity threshold, the circulating fan 353 stops running and the exhaust air with residual heat is recirculated into the rotary drying cylinder 2 to reduce the hot air supply pressure. Heat exchange fins 351 are provided in multiple and are fixedly installed on the outside of the air duct 35. The heat exchange fins 351 are used to realize the heat exchange between the air inside the air duct 35 and the exhaust air. An annular groove 354 is provided on the inner side wall of the return air shroud 34. The annular groove 354 is used to guide the discharge of condensed water droplets on the surface of the heat exchange fins 351. Drainage trough 355 is provided on the outer wall of the air guide shroud 3 and its top end is connected to the annular groove 354. Drainage trough 355 is used to drain the condensate collected in the annular groove 354. The filter support 361 is fixedly disposed on the middle part of the side of the connecting seat 36 near the filter cover 37; The filter cartridge 362 is fixed at one end of the filter support 361 and located inside the filter cover 37. The filter cartridge 362 is used to filter dust particles in the exhaust air. The filter cover 37 guides the filtered exhaust air with residual heat into the air inlet hood 31 through the return air port 33. Return air duct 4 is located inside the rotary drying cylinder 2. One end of the return air duct 4 is fixedly provided with a fixing cover 41. The fixing cover 41 is fixedly located inside the rotary drying cylinder 2 and coincides with the position of the return air cover 34. The mesh cylinder 42 is fixedly installed at the end of the return air duct 4 away from the air guide hood 3 and located inside the rotary drying cylinder 2. The mesh cylinder 42 is used to prevent the glass fiber from being discharged with the exhaust air. Multiple air guide plates 43 are provided and are arranged around the outside of the fixed cover 41. The multiple air guide plates 43 are staggered along the axis of the rotary drying cylinder 2. An air guide channel 431 is formed between two adjacent air guide plates 43. During the rotation of the rotary drying cylinder 2, the multiple air guide plates 43 alternately overlap with the air inlet cover 31. The hot air in the air inlet cover 31 alternately enters the rotary drying cylinder 2 through the multiple air guide channels 431. The staggered arrangement of the multiple air guide plates 43 allows the hot air to enter the rotary drying cylinder 2 intermittently, thereby increasing the range of motion of the glass fiber when affected by the hot air and improving the drying efficiency of the glass fiber. The guide plate 22 is provided in multiple ways and is fixedly installed on the inner wall of the rotary drying cylinder 2. The multiple guide plates 22 are all designed with an arc-shaped structure, and one end of each of the multiple guide plates 22 corresponds to the air guide channel 431. The air guide channel 431 is used to guide the hot air to move along the surface of the guide plate 22 in a spiral trajectory inside the rotary drying cylinder 2. The fork 221 is provided in multiple sets and is fixedly installed on the outside of multiple guide plates 22. The fork 221 is used to break up the glass fiber to improve the drying efficiency of the glass fiber. The feeding hood 5 is rotatably mounted on the top of the frame 1 via a pin and slides against one end of the rotary drying cylinder 2. The top of the feeding hood 5 is fixedly provided with a feeding hopper 51, and the bottom of the feeding hopper 51 is provided with a valve. The arc-shaped guide plate 23 is provided in multiple ways and is arranged around the inner wall of the rotary drying cylinder 2 near the end of the feeding hood 5. When the rotary drying cylinder 2 rotates forward, the arc-shaped guide plate 23 guides the glass fiber into the interior of the rotary drying cylinder 2. When the rotary drying cylinder 2 rotates in reverse, the arc-shaped guide plate 23 guides the glass fiber out.

[0031] When using the waste heat recovery device for drying and dehumidifying air of glass fiber in this embodiment, the hot air inlet 32 ​​is connected to the outlet of the hot air blower. The hot air generated by the hot air blower enters the air inlet hood 31 through the hot air inlet 32. The hot air enters the interior of the rotary drying cylinder 2 through the air guide channel 431. After the hot air moves to one end of the interior of the rotary drying cylinder 2, it passes through the mesh cylinder 42 and enters the return air pipe 4. Then the hot air enters the fixed cover 41 through the return air pipe 4. The hot air in the fixed cover 41 enters the filter cover 37 through the return air cover 34, and then re-enters the air inlet hood 31 through the return air port 33 to continue circulating. During this process, the hot air is circulated inside the device. When drying glass fibers, first open the valve at the bottom of the feeding hopper 51, and then feed the glass fibers into the rotary drying cylinder 2 through the feeding hopper 51. During this process, control the drive motor 13 to rotate forward. The drive motor 13 drives the rotary drying cylinder 2 to rotate forward through the drive gear 11 and the ring gear 12. The rotary drying cylinder 2 drives the arc-shaped guide plate 23 to rotate forward. The arc-shaped guide plate 23 guides the glass fibers at one end of the rotary drying cylinder 2 to move, so that the glass fibers are guided into the interior of the rotary drying cylinder 2. After the glass fibers are fed, close the valve at the bottom of the feeding hopper 51 to reduce the escape of hot air from the feeding hopper 51 and the waste of heat energy. During the drying process of glass fiber, the hot air generated by the hot air blower circulates inside the rotary drying cylinder 2. When the hot air passes through the air guide channel 431, due to the staggered structure of multiple air guide plates 43, the hot air intermittently passes through the air guide channel 431 as the rotary drying cylinder 2 drives the air guide plates 43 to rotate, so as to achieve the effect of pulsed air supply. After entering the rotary drying cylinder 2, the pulsed hot air intermittently impacts the glass fiber, so as to break the glass fiber apart. At the same time, the rotary drying cylinder 2 drives the glass fiber to move through the guide plate 22, so that the glass fiber goes through the process of being lifted and falling. During the falling process, the glass fiber collides with the material fork 221, which further breaks the glass fiber apart. The broken glass fiber exchanges heat fully with the hot air to achieve the drying effect. In addition, the moisture in the glass fiber enters the return air pipe 4 along with the hot air for circulation. In the initial stage of glass fiber drying, the moisture content of the glass fiber is high, resulting in high humidity in the exhaust air within the return air duct 4. At this point, the circulating fan 353 is activated, guiding the airflow between the insulation hood 21 and the air duct 35. Because the outer wall of the insulation hood 21 directly exchanges heat with the external environment, the air temperature inside the insulation hood 21 is lower than the temperature of the exhaust air inside the rotary drying cylinder 2. Therefore, after entering the return air hood 34, the exhaust air exchanges heat with the low-temperature air in the air duct 35 through the heat exchange fins 351. During this process, the moisture in the exhaust air condenses into water droplets on the surface of the heat exchange fins 351, then flows along the surface of the heat exchange fins 351 and drips into the annular groove 354, finally being discharged through the exhaust fan. The water tank 355 discharge device, during this process, the valve between the return air port 33 and the connecting pipe 371 is in the closed state to avoid the low temperature exhaust gas after heat exchange affecting the high temperature hot air. During this process, the air in the air duct 35 exchanges heat with the exhaust air and the temperature rises, and then is guided by the circulating fan 353 to the heat insulation cover 21 so that the temperature inside the heat insulation cover 21 rises. At this time, the heat insulation cover 21 can achieve the insulation and heat preservation between the rotary drying cylinder 2 and the external environment, thereby accelerating the temperature rise rate inside the rotary drying cylinder 2. During this process, in order to ensure that there is a sufficient temperature difference between the air duct 35 and the exhaust air to condense water vapor, the circulating fan 353 can directly draw low temperature air from the outside and inject it into the air duct 35. In the middle and later stages of glass fiber drying, the moisture content in the glass fiber decreases, and the humidity of the tail air in the return air duct 4 decreases. At this time, the circulating fan 353 is turned off and the valve between the return air port 33 and the connecting pipe 371 is opened. At this time, the tail air no longer undergoes heat exchange when passing through the return air hood 34, but directly passes through the return air hood 34 and enters the filter cartridge 362. After the tail air passes through the filter cartridge 362 to remove particulate matter, it enters the connecting pipe 371, and then enters the air inlet hood 31 through the return air port 33. After mixing with the subsequent hot air, it enters the interior of the rotary drying cylinder 2. During this process, the high-temperature tail air flows back into the rotary drying cylinder 2 to reduce the supply pressure of the hot air and increase the flow rate of the hot air to improve the drying efficiency of the device. During this process, the interior of the rotary drying cylinder 2 is in a high-temperature state. The large flow rate of hot air keeps the interior temperature of the rotary drying cylinder 2 at a high level, and the rotary drying cylinder 2 no longer relies on the heat insulation cover 21 for heat preservation. After the glass fiber is dried, the feed hood 5 is flipped to separate it from the rotary drying cylinder 2, and the drive motor 13 is controlled to reverse so that the rotary drying cylinder 2 reverses. The rotary drying cylinder 2 drives the arc-shaped guide plate 23 to reverse, guiding the dried glass fiber out.

[0032] It should be noted that this embodiment provides a hot air circulation system and a waste heat recovery system for the drying process of glass fiber in a rotary drying oven. The hot air blower mentioned in this embodiment adopts the corresponding structure in the prior art. The rotary drying cylinder 2 mentioned in this embodiment is modified from an existing rotary drying oven. The valve mentioned in this embodiment is an electromagnetically controlled pipeline valve. The circulating fan 353 mentioned in this embodiment is a fan in the prior art. The humidity sensor 3531 mentioned in this embodiment adopts the corresponding structure in the prior art. It is equipped with a controller for controlling the valve and the circulating fan 353. Under the condition of ensuring the normal implementation of the technical solution of this embodiment, there are no restrictions on the selection of the above structures. It should be further explained that in this embodiment, the rotary drying cylinder 2, the air guide hood 3 and the feeding hood 5 can rotate independently. All the connections of the above components are equipped with sliding sealing gaskets to ensure the sealing effect. In this embodiment, the heat insulation cover 21 and the rotary drying cylinder 2 can rotate independently, and a sliding sealing gasket is installed between the two to ensure the sealing effect.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste heat recovery device for dehumidifying air during glass fiber drying, characterized in that, include: The frame (1) has a drive gear (11) that can be rotatably installed at the top center. A rotary drying cylinder (2) is rotatably mounted on the top of the frame (1), and a ring gear (12) that meshes with the drive gear (11) is fixedly provided in the middle of the outer side wall of the rotary drying cylinder (2). A guide hood (3) is fixedly mounted on one end of the upper surface of the frame (1) and slides against one end of the rotary drying cylinder (2). An air inlet hood (31) is fixedly mounted on the top of the inside of the guide hood (3). A hot air inlet (32) and a return air outlet (33) are fixedly mounted on one end of the air inlet hood (31) through a three-way valve. A return air hood (34) is fixedly mounted on the middle of the side of the guide hood (3) near the rotary drying cylinder (2). An annular air guide pipe (35) is fixedly mounted inside the return air hood (34). A connecting seat (36) is fixedly mounted on one end of the return air hood (34). A filter cover (37) is fixedly mounted on one side of the connecting seat (36). A connecting pipe (371) is fixedly mounted on the top of the outer wall of the filter cover (37). The connecting pipe (371) is connected to the return air outlet (33) through a valve. The return air duct (4) is located inside the rotary drying cylinder (2). One end of the return air duct (4) is fixedly provided with a fixing cover (41). The fixing cover (41) is fixedly located inside the rotary drying cylinder (2) and coincides with the position of the return air cover (34).

2. The waste heat recovery device for dehumidifying air during glass fiber drying according to claim 1, characterized in that, Also includes: The heat insulation cover (21) is rotatably disposed on the outside of the rotary drying cylinder (2) and fixedly disposed on the top of the frame (1); The heat-insulating air duct (352) is located between the heat-insulating cover (21) and the air guide duct (35). The air in the heat-insulating air duct (352) is heated after exchanging heat with the exhaust air discharged from the rotary drying cylinder (2) outside the air guide duct (35) and then enters the heat-insulating cover (21) to keep the rotary drying cylinder (2) warm.

3. The waste heat recovery device for dehumidifying air during glass fiber drying according to claim 2, characterized in that, Also includes: A circulating fan (353) is fixedly installed on the outside of the air guide hood (3). The input and output ends of the circulating fan (353) are connected to the heat-insulating air duct (352). The circulating fan (353) is used to control the air circulation between the air guide duct (35) and the heat-insulating hood (21). A humidity sensor (3531) is fixedly installed on one end of the inner wall of the return air duct (4). The humidity sensor (3531) is used to detect the humidity of the exhaust air in the return air duct (4). When the detected value is higher than the preset humidity threshold, the circulating fan (353) is started to drive the air in the duct (35) to circulate and make the air in the duct (35) exchange heat with the exhaust air, so that some of the water vapor in the exhaust air condenses into water droplets and is discharged. When the detected value is lower than the preset humidity threshold, the circulating fan (353) stops running and the exhaust air with residual heat is recirculated into the rotary drying cylinder (2).

4. The waste heat recovery device for dehumidifying air during glass fiber drying according to claim 3, characterized in that, Also includes: Heat exchange fins (351) are provided in multiple and are fixedly installed on the outside of the air duct (35). The heat exchange fins (351) are used for heat exchange between the air inside the air duct (35) and the exhaust air. An annular groove (354) is provided on the inner wall of the return air shroud (34), and the annular groove (354) is used to guide the discharge of condensed water droplets on the surface of the heat exchange fins (351). A drainage trough (355) is provided on the outer wall of the air guide shroud (3) and its top end is connected to the annular groove (354). The drainage trough (355) is used to drain the condensate collected in the annular groove (354).

5. The waste heat recovery device for dehumidifying air during glass fiber drying according to claim 4, characterized in that, Also includes: The filter support (361) is fixedly located on the middle part of the side of the connecting seat (36) near the filter cover (37); The filter cartridge (362) is fixed at one end of the filter support (361) and located inside the filter cover (37). The filter cartridge (362) is used to filter dust particles in the exhaust air. The filter cover (37) guides the filtered exhaust air with residual heat into the air inlet cover (31) through the return air port (33).

6. The waste heat recovery device for dehumidifying air during glass fiber drying according to claim 1, characterized in that, Also includes: The mesh cylinder (42) is fixed at one end of the return air duct (4) away from the air guide hood (3) and located inside the rotary drying cylinder (2). The mesh cylinder (42) is used to prevent the glass fiber from being discharged with the tail air.

7. The waste heat recovery device for dehumidifying air during glass fiber drying according to claim 1, characterized in that, Also includes: The air guide plate (43) is provided in multiple sets and is arranged around the outside of the fixed cover (41). The multiple air guide plates (43) are staggered along the axis of the rotary drying cylinder (2). An air guide channel (431) is formed between two adjacent air guide plates (43). During the rotation of the rotary drying cylinder (2), the multiple air guide plates (43) alternately overlap with the air inlet cover (31). The hot air in the air inlet cover (31) alternately enters the rotary drying cylinder (2) through the multiple air guide channels (431). The staggered arrangement of the multiple air guide plates (43) allows the hot air to enter the rotary drying cylinder (2) intermittently. The guide plate (22) is provided in multiple and is fixedly installed on the inner wall of the rotary drying cylinder (2). The multiple guide plates (22) are all designed with an arc shape, and one end of each guide plate (22) corresponds to the air guide channel (431). The air guide channel (431) is used to guide hot air to move along the surface of the guide plate (22) in a spiral trajectory inside the rotary drying cylinder (2). The feed fork (221) is provided in multiple sets and is fixedly installed on the outside of multiple guide plates (22). The feed fork (221) is used to break up the glass fiber.

8. The waste heat recovery device for dehumidifying air during glass fiber drying according to claim 1, characterized in that, Also includes: The feeding hood (5) is rotatably mounted on the top of the frame (1) and slides against one end of the rotary drying cylinder (2) via a pin. The top of the feeding hood (5) is fixedly provided with a feeding hopper (51), and the bottom of the feeding hopper (51) is provided with a valve. The arc-shaped guide plate (23) is provided in multiple ways and is arranged around the inner side wall of the rotary drying cylinder (2) near the end of the feeding hood (5). When the rotary drying cylinder (2) rotates forward, the arc-shaped guide plate (23) guides the glass fiber into the interior of the rotary drying cylinder (2). When the rotary drying cylinder (2) rotates in reverse, the arc-shaped guide plate (23) guides the glass fiber out.

9. A waste heat recovery device for dehumidifying air during glass fiber drying according to claim 1, characterized in that, Also includes: The drive motor (13) is fixed inside the frame (1), and the output shaft of the drive motor (13) is connected to the drive gear (11) through a transmission chain.

10. A waste heat recovery device for dehumidifying air during glass fiber drying according to claim 1, characterized in that, Also includes: The support wheels (14) and circular guide rails (15) are provided. The support wheels (14) are provided in four rotatable positions at the top four corners of the frame (1). The circular guide rails (15) are provided in two sets and are fixed at both ends of the rotary drying cylinder (2).

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