A dryer tail gas waste heat recovery device

Abstract

The utility model provides a kind of dryer tail gas waste heat recovery device, including recovery tank, the inside of recovery tank is fixedly installed with heat exchange pipe in linear arrangement with equal intervals, the top of each heat exchange pipe arranged with equal intervals and top is equipped with curved communicating pipe, during the application of this technical scheme, heat exchange structure formed by heat exchange pipe and curved communicating pipe can efficiently recover dryer tail gas waste heat, and the heating water body can also be used twice, reduce energy waste, solve the problem of existing technology waste heat loss, large energy consumption;Impurities in tail gas are filtered by filter screen, to avoid heat exchange pipe blockage, solve the problem of device failure caused by impurities;Cleaning mechanism and driving mechanism can remove scale of heat exchange pipe, ensure that heat exchange efficiency is stable, reduce maintenance cost, solve the problem of heat exchange pipe scale reduction efficiency;At the same time, leakage is prevented by sealing design, maintenance structure is convenient, support structure is stable device, low-temperature discharge can effectively reduce risk.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology for dryers, and in particular to a waste heat recovery device for dryer exhaust gas. Background Technology

[0002] Currently, in the industrial production field, dryers are key equipment for dehydrating materials and meeting the requirements of subsequent processing and storage. Their core working principle is to vaporize and escape the moisture (usually water or other volatile liquid components) in the material by heating, and finally obtain solid materials that meet the specified moisture content standards. However, existing dryers generally face the problem of low energy efficiency in actual operation: in order to dry the material, the equipment needs to consume a lot of energy and convert it into heat energy. However, this heat energy cannot be fully utilized in the drying process, resulting in a large amount of waste heat being directly lost. This not only makes it difficult to achieve the production goal of energy saving and consumption reduction, but also further aggravates energy loss because the exhaust gas carries high-temperature waste heat. More importantly, the direct emission of high-temperature exhaust gas may not only pose safety hazards to the external environment of the drying chamber (such as accidental burns caused by high temperature, fire risk, etc.), but also cause certain pollution to the atmospheric environment, which is contrary to the current green and low-carbon industrial development concept.

[0003] To address the aforementioned waste heat problem, relevant technical fields have conducted targeted research and improvements. Among them, Chinese patent "CN219836124U" discloses a spray dryer for waste heat recovery, providing a feasible solution for waste heat recovery and utilization. This spray dryer mainly includes a dryer body, with a heating box and air pump on the left side and a material box and material pump on the right side wall. An atomizing nozzle and air distributor are installed at the top of the dryer body, and the air pump input is connected to the heating box outlet. Its core innovation lies in achieving waste heat recovery through a heat exchange device: high-temperature exhaust gas first exchanges heat with graphene particles through a heat pipe to raise the temperature of the graphene particles; subsequently, the heated graphene particles exchange heat again with the air in the inlet pipe through a heat exchange pipe, thereby preheating the temperature of the air in the inlet pipe; the preheated air then enters the heating box for further heating and is ultimately used in the drying process, thereby reducing energy consumption and improving energy efficiency.

[0004] Although the aforementioned waste heat recovery spray dryer has shown certain advantages in theoretical design and initial applications, its heat exchange structure still has significant defects and shortcomings in actual long-term operation, which restricts the stable and efficient operation of the equipment. Specifically, the heat exchange tubes in this equipment are located inside the device and need to be in long-term contact with water to achieve heat transfer. During this process, impurities in the water (such as calcium and magnesium ions) easily adhere to the outer surface of the heat exchange tubes, forming scale. Especially under conditions of poor water quality, the adhesion rate of impurities in the water will be significantly accelerated. As the operating time increases, the outer surface of the heat exchange tubes... The scale layer on the surface will gradually thicken, and the thermal conductivity of scale is much lower than that of metal heat exchange tubes, which will seriously hinder the effective transfer of heat. This will lead to a significant decrease in the overall heat exchange efficiency of the heat exchange device. Not only will it be difficult to continuously achieve the energy-saving effect of waste heat recovery, but the insufficient heat exchange efficiency may also affect the overall drying performance of the dryer. It may even require frequent shutdowns to clean the scale, increasing equipment maintenance costs and downtime losses. It is evident that there is still room for improvement in the heat exchange structure design of existing waste heat recovery spray dryers. There is an urgent need to optimize the design to address the scaling problem of heat exchange tubes in order to improve the long-term stability and energy utilization efficiency of the equipment. Utility Model Content

[0005] To address the aforementioned problems, this invention proposes a waste heat recovery device for dryer exhaust gas, which can more accurately solve the problems described above.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model proposes a waste heat recovery device for dryer exhaust gas, including a recovery box. Heat exchange tubes are linearly arranged at equal intervals inside the recovery box. Each of the equally spaced heat exchange tubes has a curved connecting pipe at its top and bottom. The heat exchange tubes are connected in series via the curved connecting pipes. A hot gas inlet module is fixedly installed at the top of the heat exchange tube at the input end. A cleaning mechanism is fixedly installed in the middle of the rear side of the recovery box. The cleaning ends of the cleaning mechanism are respectively sleeved on the outer surface of each heat exchange tube. A drive mechanism is fixedly installed in the middle of the back side of the recovery box. A water supply pipe is fixedly installed at the upper side of one side of the recovery box, and a drain outlet pipe is fixedly installed at the lower side of one side of the recovery box. The moving end of the drive mechanism is connected to the top of the cleaning mechanism.

[0008] The cleaning mechanism includes an inner rail, which is fixedly installed in the middle of the rear side of the recycling bin. The top end of the inner rail extends to the outside of the recycling bin. A slider is slidably connected inside the inner rail. A connecting rod is fixedly installed on the top of the slider. A cleaning module is fixedly installed on the front of the slider. The top end of the connecting rod passes through the inner rail and connects to the moving end of the drive mechanism. A sealing gasket is provided at the point where the connecting rod passes through the inner rail. The sealing gasket is used to seal the point where the connecting rod and the inner rail are passed through.

[0009] Furthermore, a water supply pipe is fixedly installed on the upper side of one side of the recycling box, and a drain outlet pipe is fixedly installed on the lower side of one side of the recycling box. Both the water supply pipe and the drain outlet pipe are fixedly installed with connecting flanges at their outer ends, and an exhaust pipe connecting flange is fixedly installed on the top of the heat exchange tube at the output end.

[0010] Furthermore, a support frame is fixedly installed at the bottom of the recycling bin, and a bottom support plate is fixedly installed at the bottom of the support frame.

[0011] Furthermore, the hot air inlet module includes an exhaust duct, which is fixedly installed on the top of the heat exchange tube at the input end. A dryer connection mounting frame is fixedly installed at the input end of the exhaust duct. Mounting holes are provided at the four corners of the dryer connection mounting frame. Fixed rails are fixedly installed at both the upper and lower ends inside the exhaust duct. A filter screen is slidably connected between the inner sides of the fixed rails. A sealing side plate is fixedly installed on the outer side of the filter screen extending from the outer side of the fixed rails. An installation arm is fixedly installed in the middle of one side of the sealing side plate. An installation screw is threadedly connected to the outer end of the installation arm. The end of the installation screw passes through the installation arm and is threadedly connected to the exhaust duct. A bridge-type handrail is fixedly installed on the outer side of the sealing side plate.

[0012] Furthermore, the driving mechanism includes an outer guide rail, which is fixedly installed in the middle of the back of the recycling bin. A base plate is fixedly installed at the bottom of the outer guide rail, and a drive motor is fixedly installed on the top rear side of the base plate. A first pulley is fixedly installed through the output end of the drive motor and at the bottom front end of the base plate. A second pulley is rotatably connected to the bottom front end of the base plate. A lead screw is slidably connected inside the outer guide rail. The bottom of the lead screw is connected to the top of the second pulley via a coupling. The first pulley is connected to the second pulley via a transmission belt. A sliding block is threaded onto the outer surface of the lead screw. A hollow connecting square tube is fixedly installed on the top of the sliding block. A connecting pipe is fixedly connected to the top of the hollow connecting square tube. The outer end of the connecting pipe is connected to the outer end of the connecting rod.

[0013] Furthermore, an inspection window is provided at the upper front of the recycling bin, and an inspection sealing cover is installed inside the inspection window by bolts.

[0014] Furthermore, the cleaning module includes a fixing plate, which is fixedly installed on the front of the slider. Connecting blocks are linearly arranged at equal intervals on the front of the fixing plate and installed by screws. A rear arc-shaped cleaning plate is fixedly installed at the front end of the connecting blocks. A front arc-shaped cleaning plate is installed on the front of the rear arc-shaped cleaning plate by screws. The rear arc-shaped cleaning plate and the front arc-shaped cleaning plate are sleeved on the outer surface of the heat exchange tube. Arc-shaped brush plates are fixedly installed on the inner sides of both the rear arc-shaped cleaning plate and the front arc-shaped cleaning plate. The inner side of the arc-shaped brush plates is in close contact with the outer surface of the heat exchange tube.

[0015] The beneficial effects of this utility model are:

[0016] 1. During the application of this technical solution, the heat exchange structure composed of heat exchange tubes and curved connecting pipes allows the high-temperature exhaust gas discharged from the dryer to flow fully through the heat exchange tubes during use, transferring heat to the water in the recovery tank. This achieves efficient recovery of waste heat from the exhaust gas. Simultaneously, the heated water can be reused in the production process, significantly reducing energy waste and improving energy efficiency. This solves the problems of direct loss of waste heat and high energy consumption in existing technologies. Furthermore, the filter screen in the hot gas inlet module filters dust and particulate impurities from the exhaust gas during use, preventing impurities from clogging the heat exchange tubes and ensuring smooth exhaust gas flow. This solves the problem of untreated exhaust gas impurities easily causing device malfunctions in existing technologies. Finally, the use of sealing gaskets and connecting flanges ensures that all connections are sealed during use, preventing water and exhaust gas leakage and maintaining a clean production environment. This solves the problem of poor sealing and leakage in existing technologies.

[0017] 2. During the application of this technical solution, the cleaning mechanism and drive mechanism work together to allow the drive motor to move the cleaning module along the heat exchange tube during use. The arc-shaped brush wipes away scale on the outer surface of the heat exchange tube, thus maintaining good thermal conductivity and ensuring long-term stable heat exchange efficiency. This eliminates the need for frequent shutdowns for disassembly and cleaning, reducing maintenance time and costs, and solving the problem of decreased heat exchange efficiency due to scale buildup on heat exchange tubes in existing technologies. The inclusion of a maintenance sealing cover and maintenance window allows for easy access to the cleaning module components for inspection and replacement during use, reducing maintenance difficulty and solving the problem of inconvenient maintenance of internal components in existing technologies. The inclusion of a support frame and bottom support plate ensures stable placement of the device during use, facilitating pipe connection operations and solving the problems of unstable placement and inconvenient installation and maintenance in existing technologies. The low-temperature exhaust gas emission design reduces safety hazards and air pollution to the surrounding environment, solving the problem of safety risks and environmental pollution caused by high-temperature exhaust gas emissions in existing technologies. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the rear view structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the drive mechanism and cleaning mechanism of this utility model;

[0022] Figure 5 This is a schematic diagram of the hot gas inlet module structure of this utility model;

[0023] Figure 6 This utility model Figure 3 A magnified structural diagram at point A.

[0024] In the diagram: 1. Recycling bin; 2. Heat exchanger pipe; 3. Curved connecting pipe; 4. Water supply pipe; 5. Hot air inlet module; 51. Exhaust duct; 52. Mounting frame; 53. Mounting hole; 54. Fixed rail; 55. Filter screen; 56. Sealing side plate; 57. Mounting arm; 58. Mounting screw; 59. Bridge-type handrail; 6. Cleaning mechanism; 61. Inner rail; 62. Slider; 63. Connecting rod; 64. Cleaning module; 641. Fixed plate; 642. 643. Connecting block; 644. Rear arc-shaped cleaning plate; 645. Front arc-shaped cleaning plate; 646. Arc-shaped brush plate; 7. Drive mechanism; 71. Outer guide rail; 72. Base plate; 73. Drive motor; 74. First pulley; 75. Second pulley; 76. Lead screw; 77. Sliding block; 78. Hollow connecting square tube; 79. Connecting pipe; 8. Drainage outlet pipe; 9. Support frame; 10. Bottom support plate; 11. Inspection window; 12. Inspection sealing cover. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1

[0027] A waste heat recovery device for dryer exhaust gas includes a recovery box 1. Heat exchange tubes 2 are linearly arranged and fixedly installed at equal intervals inside the recovery box 1. Each heat exchange tube 2 is provided with a curved connecting pipe 3 at its top and bottom. The heat exchange tubes 2 are connected in series through the curved connecting pipes 3. A hot gas inlet module 5 is fixedly installed at the top of the heat exchange tube 2 at the input end. A cleaning mechanism 6 is fixedly installed in the middle of the rear side inside the recovery box 1. The cleaning end of the cleaning mechanism 6 is respectively sleeved on the outer surface of each heat exchange tube 2. A drive mechanism 7 is fixedly installed in the middle of the back side of the recovery box 1. A water supply pipe 4 is fixedly installed at the upper side of one side of the recovery box 1. A drain outlet pipe 8 is fixedly installed at the lower side of one side of the recovery box 1. The moving end of the drive mechanism 7 is connected to the top of the cleaning mechanism 6.

[0028] The cleaning mechanism 6 includes an inner rail 61, which is fixedly installed in the middle of the rear side of the recycling bin 1. The top end of the inner rail 61 extends to the outside of the recycling bin 1. A slider 62 is slidably connected inside the inner rail 61. A connecting rod 63 is fixedly installed on the top of the slider 62. A cleaning module 64 is fixedly installed on the front of the slider 62. The top end of the connecting rod 63 passes through the inner rail 61 and connects to the moving end of the drive mechanism 7. A sealing gasket is provided at the point where the connecting rod 63 passes through the inner rail 61. The sealing gasket is used to seal the point where the connecting rod 63 and the inner rail 61 are penetrated. This device applies... During this process, by setting up heat exchange tubes 2 and curved connecting pipes 3 inside the recovery tank 1, the exhaust gas discharged from the dryer can enter the heat exchange tubes 2 at the input end via the hot gas entry module 5. Since all the heat exchange tubes 2 are connected in series through the curved connecting pipes 3, the exhaust gas can flow through all the heat exchange tubes 2 in sequence. At the same time, water is injected into the recovery tank 1 through the water supply pipe 4. The water surrounds the heat exchange tubes 2, and the heat carried by the exhaust gas is transferred to the water through the tube walls of the heat exchange tubes 2, realizing the recovery of waste heat from the exhaust gas. When the water absorbs heat and heats up, it can be discharged through the drain outlet pipe 8. The cooled water is exported for other uses, achieving secondary utilization of waste heat. When scale buildup on the outer surface of heat exchange tube 2 affects heat exchange, the drive mechanism 7 is activated. The moving end of the drive mechanism 7 drives the connecting rod 63 of the cleaning mechanism 6 to move. The connecting rod 63 drives the sliding block 77 inside the inner rail 61 to slide. The sliding block 77 drives the front cleaning module 64 to move synchronously. The cleaning end of the cleaning module 64 is fitted onto the outer surface of the heat exchange tube 2. During the movement, the scale on the outer surface of the heat exchange tube 2 can be cleaned, ensuring the heat exchange efficiency of the heat exchange tube 2. The inner rail 61 is also cleaned. The sealing gasket at the through-hole of the connecting rod 63 can seal the through-hole position and prevent water in the recovery tank 1 from leaking through this point. During the overall use, the cooperation between the heat exchange tube 2 and the curved connecting tube 3 can efficiently recover the waste heat of the exhaust gas and reduce energy waste. The cooperation between the cleaning mechanism 6 and the drive mechanism 7 can remove scale in time and maintain a stable heat exchange effect. The sealing gasket can ensure the airtightness of the device and prevent water leakage from affecting the use. The setting of the water supply pipe 4 and the drain outlet pipe 8 facilitates the injection and discharge of water and ensures the smooth operation of waste heat recovery and secondary utilization.

[0029] Combination Figures 1-5As shown, a water supply pipe 4 is fixedly installed on the upper side of one side of the recovery box 1, and a drain outlet pipe 8 is fixedly installed on the lower side of one side of the recovery box 1. Both the water supply pipe 4 and the drain outlet pipe 8 have connecting flanges fixedly installed at their outer ends. An exhaust pipe connecting flange is fixedly installed on the top of the heat exchange tube 2 located at the output end. A support frame 9 is fixedly installed at the bottom of the recovery box 1, and a bottom support plate 10 is fixedly installed at the bottom of the support frame 9. The hot air entry module 5 includes an exhaust duct 51, which is fixedly installed on the top of the heat exchange tube 2 at the input end. A dryer connection mounting frame 52 is fixedly installed at the input end of the exhaust duct 51. Mounting holes 53 are provided at the four corners of the dryer connection mounting frame 52. Fixed rails 54 are fixedly installed at both the upper and lower ends inside the exhaust duct 51. A filter screen 55 is slidably connected between the inner sides of the fixed rails 54. A sealing side plate 56 is fixedly installed on the outer side of the filter screen 55 extending beyond the outer side of the fixed rails 54. An mounting arm 57 is fixedly installed in the middle of one side of the sealing side plate 56, and the outer end of the mounting arm 57 is threaded. A mounting screw 58 is connected, with its end threaded through the mounting arm 57 and the exhaust duct 51. A bridge-type handrail 59 is fixedly installed on the outer side of the sealing side plate 56. The drive mechanism 7 includes an outer guide rail 71, which is fixedly installed in the middle of the back of the recycling bin 1. A base plate 72 is fixedly installed at the bottom of the outer guide rail 71. A drive motor 73 is fixedly installed on the top rear side of the base plate 72. The output end of the drive motor 73 passes through the base plate 72 and is fixedly installed with a first pulley 74. The bottom of the base plate 72... The front end of the part is rotatably connected to a second pulley 75. The inner side of the outer guide rail 71 is slidably connected to a lead screw 76. The bottom of the lead screw 76 is connected to the top of the second pulley 75 through a coupling. The first pulley 74 is connected to the second pulley 75 through a transmission belt. The outer surface of the lead screw 76 is threaded with a sliding block 77. The top of the sliding block 77 is fixedly installed with a hollow connecting square tube 78. The top of the hollow connecting square tube 78 is fixedly connected with a connecting pipe 79. The outer end of the connecting pipe 79 is connected to the outer end of the connecting rod 63.

[0030] In the above-described embodiments of this application, during the application of this device, by setting connecting flanges at the outer ends of the water supply pipe 4 and the drain outlet pipe 8, the water supply pipe 4 and the drain outlet pipe 8 can be securely connected to the external water pipe using the connecting flanges, ensuring the sealing of water injection and discharge. Simultaneously, through the exhaust pipe connecting flange at the top of the heat exchange pipe 2 at the output end, the exhaust pipe can be reliably connected to the external pipe, ensuring smooth discharge of exhaust gas after heat exchange. The support frame 9 and bottom support plate 10 at the bottom of the recovery box 1 provide stable support for the entire device, preventing the device from shaking and affecting operation during use. In the air inlet stage, the exhaust gas discharged from the dryer can enter the heat exchange tube 2 at the input end through the exhaust duct 51 of the hot air inlet module 5. The dryer connection mounting frame 52 at the input end of the exhaust duct 51 can be securely connected to the dryer through the mounting holes 53 at the four corners, ensuring smooth entry of the exhaust gas. Furthermore, the filter screen 55, which is slidably connected to the fixed rails 54 at both the upper and lower ends inside the exhaust duct 51, can filter impurities in the exhaust gas, preventing them from clogging the heat exchange tube 2. When the filter screen 55 needs cleaning or replacement, the mounting screw 58 at the outer end of the mounting arm 57 can be unscrewed, and the filter screen 55 can be pulled out along the fixed rail 54 by holding the bridge handle 59. The operation is convenient and efficient. The side sealing plate 56 ensures the airtightness of the filter screen 55 after installation, preventing exhaust gas leakage. When it is necessary to clean the scale on the outer surface of the heat exchange tube 2, the drive motor 73 of the drive mechanism 7 is started. The output end of the drive motor 73 drives the first pulley 74 to rotate. The first pulley 74 drives the second pulley 75 to rotate through the transmission belt. The second pulley 75 drives the lead screw 76 inside the outer guide rail 71 to rotate through the coupling. The sliding block 77, which is threaded on the outer surface of the lead screw 76, slides along the outer guide rail 71. The hollow connecting square tube 78 at the top of the sliding block 77 drives the connecting tube 79 to move. The connecting tube 79 then pulls the connecting tube of the cleaning mechanism 6. Rod 63 causes sliding block 77 to slide along inner rail 61 and drive cleaning module 64 to clean scale. The entire driving process is stable and reliable, effectively ensuring the cleaning effect. During overall use, the connecting flange improves the sealing and stability of the pipeline connection, and the support frame 9 and bottom support plate 10 ensure the overall stability of the device. The structure of hot gas entering module 5 not only realizes the smooth introduction of exhaust gas and impurity filtration, but also facilitates the maintenance of filter screen 55. The structure of drive mechanism 7 provides stable power for cleaning mechanism 6, ensuring efficient scale cleaning, thereby ensuring the heat exchange efficiency of heat exchange tube 2 and realizing the effective recovery and utilization of exhaust gas waste heat.

[0031] Example 2

[0032] Combination Figures 3-6As shown, a maintenance window 11 is provided at the upper front of the recycling box 1. A maintenance sealing cover 12 is installed inside the maintenance window 11 by bolts. The cleaning module 64 includes a fixing plate 641, which is fixedly installed on the front of the slider 62. Connecting blocks 642 are installed on the front of the fixing plate 641 in a linear arrangement at equal intervals by screws. A rear arc-shaped cleaning plate 643 is fixedly installed at the front end of the connecting block 642. A front arc-shaped cleaning plate 644 is installed on the front of the rear arc-shaped cleaning plate 643 by screws. The rear arc-shaped cleaning plate 643 and the front arc-shaped cleaning plate 644 are sleeved on the outer surface of the heat exchange tube 2. Arc-shaped brush plates 645 are fixedly installed on the inner side of both the rear arc-shaped cleaning plate 643 and the front arc-shaped cleaning plate 644. The inner side of the arc-shaped brush plates 645 is in close contact with the outer surface of the heat exchange tube 2.

[0033] The technical solution described in the above-described embodiments of this application, during the application of this device, by setting an inspection window 11 and an inspection sealing cover 12 at the upper front of the recycling box 1, allows for maintenance of the internal components of the recycling box 1 during use. This is achieved by unscrewing the bolts and removing the inspection sealing cover 12, and then operating through the inspection window 11. After maintenance, the inspection sealing cover 12 is reinstalled and the bolts tightened, ensuring the sealing of the recycling box 1 and preventing water or exhaust gas leakage from affecting operation. When cleaning scale from the heat exchange tube 2, the cleaning... The fixing plate 641 of the cleaning module 64 moves with the slider 62. The connecting block 642, which is installed on the front of the fixing plate 641 by screws, drives the rear arc-shaped cleaning plate 643 to move synchronously. The front arc-shaped cleaning plate 644, which is installed on the front of the rear arc-shaped cleaning plate 643 by screws, and the rear arc-shaped cleaning plate 643 together fit on the outer surface of the heat exchange tube 2. The arc-shaped brush plate 645 fixed on the inner side of both is in contact with the outer surface of the heat exchange tube 2. As the cleaning module 64 moves, the arc-shaped brush plate 645 can wipe the scale on the outer surface of the heat exchange tube 2. The cleaning process ensures effective removal of scale, maintaining the heat exchange efficiency of heat exchange tube 2. When the rear arc-shaped cleaning plate 643, front arc-shaped cleaning plate 644, or arc-shaped brush plate 645 shows wear and needs replacement, the inside of the recovery box 1 can be accessed through the maintenance window 11. By unscrewing the screws between the connecting block 642 and the fixing plate 641, and between the rear arc-shaped cleaning plate 643 and the front arc-shaped cleaning plate 644, the old parts can be removed and replaced with new ones. The operation is convenient and quick, without the need for extensive disassembly of the device. During overall use, the cooperation between the maintenance window 11 and the maintenance sealing cover 12 provides a convenient passage for internal maintenance of the device, reducing maintenance difficulty and time. The structural design of the cleaning module 64 ensures the thoroughness of scale removal. The close contact between the arc-shaped brush plate 645 and the heat exchange tube 2 can efficiently remove scale. At the same time, the screw connection method facilitates the replacement of the cleaning module 64 parts, ensuring that the cleaning mechanism 6 can play a stable role in the long term, thereby ensuring the continuous and efficient heat exchange of heat exchange tube 2 and realizing the effective recovery of waste heat from the exhaust gas.

[0034] The working principle and advantages of this utility model are as follows: Before using this device to recover waste heat from the dryer exhaust gas, the initialization and preparation of the device must be completed. First, a certain amount of water is injected into the recovery tank 1 through the water supply pipe 4 at the upper end of one side of the recovery tank 1 until the water completely submerges all the heat exchange tubes 2 arranged linearly at equal intervals inside the recovery tank 1. After the injection is completed, the control valve of the water supply pipe 4 is closed. The recovery tank 1, as the main supporting structure of the device, not only provides a stable installation space for components such as the heat exchange tubes 2 and the cleaning mechanism 6, but also accommodates the water used for heat exchange, ensuring that the subsequent heat exchange process is carried out efficiently in a closed environment and avoiding water leakage from affecting the heat exchange effect. Then, the exhaust hopper 51 is fixedly connected to the exhaust gas discharge end of the dryer through the mounting holes 53 at the four corners of the dryer connection mounting frame 52 in the hot air entry module 5. At the same time, with the help of the mounting arm 57 and the mounting screw 58, the sealing side plate 56 with the filter screen 55 is fixed to the exhaust hopper 51 to ensure the sealing of the connection and prevent exhaust gas leakage. The dryer connection mounting frame 52 can realize the following: The device is connected to the dryer. The exhaust duct 51 can receive the exhaust gas discharged from the dryer and guide it stably to the heat exchange tube 2. The fixed rail 54 provides a sliding installation path for the filter screen 55. The filter screen 55 can effectively block dust, particles and other impurities in the exhaust gas, preventing impurities from entering the heat exchange tube 2 and causing blockage. The bridge-type handrail 59 makes it easy for operators to pull out the filter screen 55 for cleaning or replacement, improving maintenance convenience. Finally, the exhaust pipe connecting flange at the top of the heat exchange tube 2 at the output end is connected to the external exhaust pipe, and the drain output pipe 8 at the lower end of one side of the recovery box 1 is connected to the pipe of the external water storage or water-using equipment. The connecting flange at the outer end of the water supply pipe 4 and the drain output pipe 8 can ensure the sealing and stability of the connection between this device and the external water pipe. The exhaust pipe connecting flange can ensure the smooth discharge of the exhaust gas after heat exchange. The entire initialization process provides stable conditions for subsequent waste heat recovery operations. The support frame 9 and the bottom support plate 10 at the bottom of this device support the recovery box 1 to a suitable height, which not only facilitates the connection operation of each pipe, but also ensures the stability of the device and avoids shaking during operation.

[0035] After initialization preparation is complete, the dryer can be started to begin the exhaust gas introduction and heat exchange operation. The high-temperature exhaust gas generated by the dryer enters the exhaust duct 51 of the hot gas inlet module 5 through the dryer exhaust gas outlet. As it flows through the exhaust duct 51, dust, particles, and other impurities in the exhaust gas are effectively filtered by the filter screen 55, ensuring the cleanliness of the exhaust gas entering the heat exchange tube 2 and preventing impurities from clogging the internal channels of the heat exchange tube 2, thus ensuring smooth exhaust gas flow. The filtered high-temperature exhaust gas enters the heat exchange tube 2 at the inlet end. Since each heat exchange tube 2 is connected in series through the top and bottom curved connecting pipes 3, the exhaust gas can flow through all the heat exchange tubes 2 in sequence. The curved connecting pipes 3 extend the exhaust gas flow within the unit. The increased residence time within the tube increases the contact area between the exhaust gas and the wall of the heat exchange tube 2, allowing the heat carried by the exhaust gas to be transferred more fully to the water in the recovery tank 1 through the wall of the heat exchange tube 2. As the core component for heat exchange between the exhaust gas and the water, the evenly spaced arrangement of the heat exchange tube 2 further optimizes the heat transfer efficiency, allowing the water temperature to gradually rise and achieving efficient recovery of waste heat from the dryer exhaust gas. During the heat exchange process, the enclosed environment of the recovery tank 1 prevents heat loss to the outside, further ensuring the heat exchange effect. After completing the heat exchange, the low-temperature exhaust gas enters the external exhaust pipe through the exhaust pipe connection flange at the top of the heat exchange tube 2 at the output end, and is finally discharged from the device.

[0036] Once the water temperature in the recovery tank 1 rises to the set value required for production, the water can be reused after heat exchange. The control valve of the drain outlet pipe 8 is opened, and the heated water flows smoothly into external water storage or water-using equipment through the drain outlet pipe 8. This high-temperature water can be directly used for heating, cleaning, and other processes in the production process, realizing the secondary utilization of waste heat. If the dryer needs to continue to operate and recover waste heat, cold water can be injected back into the recovery tank 1 through the water supply pipe 4 after the high-temperature water is discharged, repeating the above heat exchange process. The entire water replacement and recycling operation is simple and convenient, and can be achieved without stopping the machine, ensuring the continuity of the waste heat recovery operation of this device and avoiding production interruptions caused by water replacement. The stable structure of the drain outlet pipe 8 ensures that there will be no leakage during the water discharge process, maintaining the cleanliness of the production environment and avoiding water waste.

[0037] During long-term operation of this device, when a certain thickness of scale gradually adheres to the outer surface of the heat exchange tube 2 due to contact with water, the cleaning mechanism 6 needs to be activated to clean the scale from the heat exchange tube 2 to ensure long-term stable heat exchange efficiency. The drive motor 73 of the drive mechanism 7 is then activated. The output of the drive motor 73 drives the first pulley 74 to rotate. The first pulley 74 drives the second pulley 75 to rotate via a transmission belt. The second pulley 75 drives the lead screw 76 to rotate via a coupling. The outer guide rail 71 in the drive mechanism 7 provides mounting and guidance for the lead screw 76 and the sliding block 77. The base plate 72 provides stable mounting support for the drive motor 73 and the second pulley 75, ensuring stable and reliable power transmission. When the lead screw 76 rotates, its outer surface thread... The connected sliding block 77 slides up or down along the outer guide rail 71. The sliding block 77 drives the connecting pipe 79 to move synchronously through the hollow connecting square tube 78. The connecting pipe 79 pulls the connecting rod 63 of the cleaning mechanism 6, causing the connecting rod 63 to drive the sliding block 77 to slide up and down along the inner rail 61 in the middle of the rear side of the recycling box 1. A sealing gasket is provided at the point where the connecting rod 63 penetrates the inner rail 61. The sealing gasket is used to seal the point where the connecting rod 63 and the inner rail 61 are penetrated, preventing water in the recycling box 1 from leaking through the penetration point. The inner rail 61 provides precise sliding guidance for the slider 62, ensuring that the slider 62 moves smoothly and avoiding deviation. The cleaning module 64 on the front of the slider 62 moves synchronously with the slider 62. The cleaning module 64 has a fixed... Plate 641 is fixed to the front of slider 62, providing an installation base for connecting block 642. Connecting block 642 is connected to fixing plate 641 by screws, thus fixing rear arc-shaped cleaning plate 643. Rear arc-shaped cleaning plate 643 and front arc-shaped cleaning plate 644 are connected by screws and sleeved on the outer surface of heat exchange tube 2. Both provide a stable mounting carrier for arc-shaped brush plate 645. The inner side of arc-shaped brush plate 645 is in close contact with the outer surface of heat exchange tube 2. During movement, friction is generated with the outer surface of heat exchange tube 2, thoroughly wiping off the scale adhering to the outer surface of heat exchange tube 2. After the scale falls to the bottom of recovery tank 1, it can be discharged through drain outlet pipe 8 during subsequent drainage, or manually cleaned by opening maintenance sealing cover 12, without the need for manual cleaning. Frequent shutdowns for disassembly and cleaning reduce equipment maintenance time and downtime losses, lowering maintenance costs. When it is necessary to inspect or replace the rear arc-shaped cleaning plate 643, front arc-shaped cleaning plate 644, or other components in the cleaning module 64, the device can be stopped first. Open the inspection sealing cover 12 at the top front of the recycling bin 1, enter the recycling bin 1 through the inspection window 11, unscrew the screws between the connecting block 642 and the fixing plate 641, and the screws between the rear arc-shaped cleaning plate 643 and the front arc-shaped cleaning plate 644, and the old rear arc-shaped cleaning plate 643 and the front arc-shaped cleaning plate 644 can be removed and replaced with new components. After the replacement is completed, re-tighten the screws, close the inspection sealing cover 12, and the device can resume operation.After cleaning, the drive motor 73 is turned off, and the cleaning module 64 stops moving. The device continues to perform waste heat recovery from the exhaust gas. By setting up a filter screen 55, this device effectively solves the problem of device malfunction caused by untreated exhaust gas impurities in the background technology, ensuring smooth exhaust gas flow. By connecting the heat exchange tube 2 in series with the curved connecting pipe 3, the residence time of the exhaust gas is extended and the contact area is increased. Compared with the direct loss of waste heat in the background technology, this significantly reduces energy waste and improves energy utilization efficiency. Low-temperature exhaust gas emissions reduce safety hazards to the external environment of the drying chamber and reduce the impact on the atmospheric environment, meeting the safety and environmental protection requirements of industrial production. The secondary utilization of high-temperature water allows the recovered waste heat to be truly converted into reusable energy, maximizing the value of waste heat and reducing additional energy consumption. The sealing gasket at the penetration point of the inner rail 61 prevents water leakage and ensures the airtightness of the device operation. The automated operation of mechanism 6 reduces manual intervention and effectively solves the problem of reduced heat exchange efficiency caused by scaling of heat exchange tube 2 in the background technology. It ensures that heat exchange tube 2 always maintains good thermal conductivity, guarantees long-term stable heat exchange efficiency, avoids the impact of insufficient heat exchange efficiency on the overall performance of the dryer, and improves the efficiency and safety of cleaning operations. The setting of the inspection and sealing cover plate 12 provides a convenient passage for the inspection and replacement of components such as the rear arc-shaped cleaning plate 643 and the front arc-shaped cleaning plate 644, further reducing the difficulty of maintenance. The support frame 9 and the bottom support plate 10 ensure the stability of the device, and the connection flanges ensure the connection seal. The overall structural design improves the practicality and reliability of the device, reduces maintenance costs and the risk of production interruption. During application, its arc-shaped brush plate 645 can be set as a soft brush or a steel brush, which can be selected according to the needs. When using a steel brush, it can better remove stubborn scale layers.

[0038] During the application of this device, the drive motor 73 is a three-phase asynchronous motor, model Y2-100L1-4, with a power range of 0.75-1.1kW, rated voltage of 380V, and rated speed of 1440r / min. An encoder, model E6B2-CWZ6C, with a resolution of 1000-2000P / R, is installed on the motor shaft end to achieve accurate detection of the motor rotation angle and stepless speed regulation. A gearbox reducer, model RV40, with a reduction ratio range of 1:10-1:100, is installed between the motor and the drive mechanism 7 to assist in increasing output torque and regulating and reducing speed to meet the smooth movement requirements of the cleaning mechanism 6. The controller is a PLC controller, model S7-200SMART CPU SR40, installed in the electrical control box on the side of the recycling bin 1. The controller has a touch screen display screen, model KTP700, on the front. The basic module, measuring 7 inches, is used for parameter setting, operating status display, and fault alarm. Auxiliary sensors include: a PT100 temperature sensor with a measurement range of -50-200℃, installed inside the water in the recovery tank 1 and at the outlet of the heat exchange tube 2, used to detect water and exhaust gas temperatures; a submersible level sensor with a measurement range of 0-2m, installed on the inner wall of the recovery tank 1, used to detect the water level inside the tank; a pressure sensor, MPX5010DP with a measurement range of 0-10kPa, installed in the exhaust duct 51 of the hot gas inlet module 5, used to detect exhaust gas pressure; and a TL-N5ME1 proximity switch with a detection distance of 5mm, installed at both ends of the inner rail 61, used to limit the travel of the slider 62 of the cleaning mechanism 6. The circuit connection is as follows: external 380V three-phase AC power is connected to the circuit breaker and contactor. The power supply terminal of drive motor 73 and the signal terminal of motor encoder are connected to the high-speed counting port of PLC controller via shielded wires; the gearbox reducer and motor output shaft are mechanically connected via couplings, requiring no additional circuit connection; the power supply terminal of PLC controller is connected to 220V AC power, and its digital output port is connected to the contactor coil of drive motor 73, the solenoid valve coils of water supply pipe 4 and drain outlet pipe 8 via relays respectively; the signal output terminals of temperature sensor, liquid level sensor, and pressure sensor are connected to the analog input port of PLC controller via signal lines, and the signal terminal of proximity switch is connected to the digital input port of PLC controller; the display screen is connected to the communication port of PLC controller via RS485 communication line to realize data interaction; the entire circuit system is equipped with overload protection, short circuit protection, and leakage protection modules, and the power supply circuit contains a series fuse, model RT18-32, rated current 10-16A;The control principle is as follows: The PLC controller receives temperature, liquid level, pressure, and stroke signals collected by various sensors. After internal program calculation, it controls the start / stop and speed adjustment of the drive motor 73, and the switching of the solenoid valve. Simultaneously, it transmits the operating data to the display screen in real time. When a parameter exceeds the set range, the controller triggers an alarm function, displaying fault information on the screen. The motor encoder feeds back the speed signal to the controller in real time, forming a closed-loop control to ensure stable movement speed of the cleaning mechanism 6. The gearbox reducer, based on the motor output speed and required torque, achieves speed reduction and torque increase through a fixed reduction ratio, meeting the effective cleaning requirements of the cleaning module 64 for scale removal from the heat exchange tube 2.

[0039] The scope of protection of this application does not involve improvements to the electronic components of the device or equipment. Therefore, the working principles of each electronic component are not described in detail here. The electronic components in this application are all conventional electronic components used in the prior art. They are all conventional technical means in the prior art, and the application of the prior art is very mature. Therefore, they will not be elaborated here.

[0040] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A waste heat recovery device for dryer exhaust gas, characterized in that, The system includes a recycling bin (1), in which heat exchange tubes (2) are fixedly installed in a linear arrangement at equal intervals inside the recycling bin (1). Each of the heat exchange tubes (2) arranged at equal intervals has a curved connecting pipe (3) at its top and bottom. The heat exchange tubes (2) are connected in series through the curved connecting pipe (3). A hot gas inlet module (5) is fixedly installed at the top of the heat exchange tube (2) located at the input end. A cleaning mechanism (6) is fixedly installed in the middle of the rear side inside the recycling bin (1). A drive mechanism (7) is fixedly installed in the middle of the back side of the recycling bin (1). The cleaning mechanism (6) includes an inner rail (61), which is fixedly installed in the middle of the rear side of the recycling bin (1). The top end of the inner rail (61) extends to the outside of the recycling bin (1). A slider (62) is slidably connected inside the inner rail (61). A connecting rod (63) is fixedly installed on the top of the slider (62). A cleaning module (64) is fixedly installed on the front of the slider (62). The top end of the connecting rod (63) passes through the inner rail (61) and is connected to the moving end of the drive mechanism (7).

2. The waste heat recovery device for dryer exhaust gas according to claim 1, characterized in that, A water supply pipe (4) is fixedly installed on the upper side of one side of the recycling box (1), and a drain outlet pipe (8) is fixedly installed on the lower side of one side of the recycling box (1). Both the water supply pipe (4) and the drain outlet pipe (8) are fixedly installed with connecting flanges at their outer ends. An exhaust pipe connecting flange is fixedly installed on the top of the heat exchange pipe (2) located at the output end.

3. The waste heat recovery device for dryer exhaust gas according to claim 1, characterized in that, The bottom of the recycling bin (1) is fixedly installed with a support frame (9), and the bottom of the support frame (9) is fixedly installed with a bottom support plate (10).

4. The waste heat recovery device for dryer exhaust gas according to claim 1, characterized in that, The hot air inlet module (5) includes an exhaust duct (51), which is fixedly installed on the top of the heat exchange tube (2) at the input end. A dryer connection mounting frame (52) is fixedly installed at the input end of the exhaust duct (51). Mounting holes (53) are provided at the four corners of the dryer connection mounting frame (52). Fixed rails (54) are fixedly installed at both the upper and lower ends inside the exhaust duct (51). A filter is slidably connected between the inner sides of the fixed rails (54). The filter screen (55) extends outward from the outside of the fixed rail (54) and is fixedly mounted with a sealing side plate (56). An installation arm (57) is fixedly mounted on the middle of one side of the sealing side plate (56). An installation screw (58) is threadedly connected to the outer end of the installation arm (57). The end of the installation screw (58) passes through the installation arm (57) and is threadedly connected to the exhaust duct (51). A bridge-type handrail (59) is fixedly mounted on the outside of the sealing side plate (56).

5. The waste heat recovery device for dryer exhaust gas according to claim 1, characterized in that, The drive mechanism (7) includes an outer guide rail (71), which is fixedly installed in the middle of the back of the recycling bin (1). A base plate (72) is fixedly installed at the bottom of the outer guide rail (71). A drive motor (73) is fixedly installed on the rear top side of the base plate (72). A first pulley (74) is fixedly installed through the base plate (72) at the output end of the drive motor (73). A second pulley (75) is rotatably connected to the front bottom of the base plate (72). The outer guide rail (71) is internally slidably connected. There is a lead screw (76), the bottom of which is connected to the top of the second pulley (75) via a coupling. The first pulley (74) is connected to the second pulley (75) via a transmission belt. A sliding block (77) is threaded onto the outer surface of the lead screw (76). A hollow connecting square tube (78) is fixedly installed on the top of the sliding block (77). A connecting pipe (79) is fixedly connected to the top of the hollow connecting square tube (78). The outer end of the connecting pipe (79) is connected to the outer end of the connecting rod (63).

6. The waste heat recovery device for dryer exhaust gas according to claim 1, characterized in that, The recycling bin (1) has an inspection window (11) at the upper front end, and an inspection sealing cover (12) is installed inside the inspection window (11) by bolts.

7. The waste heat recovery device for dryer exhaust gas according to claim 5, characterized in that, The cleaning module (64) includes a fixing plate (641), which is fixedly installed on the front of the slider (62). Connecting blocks (642) are linearly arranged at equal intervals on the front of the fixing plate (641) and installed by screws. A rear arc-shaped cleaning plate (643) is fixedly installed at the front end of the connecting block (642). A front arc-shaped cleaning plate (644) is installed on the front of the rear arc-shaped cleaning plate (643) by screws. The rear arc-shaped cleaning plate (643) and the front arc-shaped cleaning plate (644) are sleeved on the outer surface of the heat exchange tube (2). Arc-shaped brush plates (645) are fixedly installed on the inner side of both the rear arc-shaped cleaning plate (643) and the front arc-shaped cleaning plate (644). The inner side of the arc-shaped brush plate (645) is in close contact with the outer surface of the heat exchange tube (2).

Images