A waste heat recovery device for a drying tower

Abstract

The utility model relates to the field of drying tower discloses a kind of waste heat recovery devices of drying tower, including tee pipe, the tee pipe is connected and fixed in the right side of drying tower body, the right side of drying tower body is equipped with two filter boxes, the inside of two the mounting hole is respectively detachably installed with filter screen, the right side of the filter box is equipped with box, the left side of the box is fixed with suction pump, two The branch pipe is equipped with first solenoid valve.In the utility model, through the synergies of tee pipe, filter box, mounting hole, filter screen, box, suction pump, gas guide pipe, main pipe, branch pipe, first solenoid valve and PLC controller, waste heat recovery of drying tower body is realized, and the impurities in waste heat hot gas can be filtered, while the filter screen can be maintained or replaced without shutdown, improve the operation continuity and stability of device, improve overall production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of drying towers, specifically to a waste heat recovery device for drying towers. Background Technology

[0002] Polyester chips are the main raw material for producing PET (polyethylene terephthalate) plastic, widely used in the manufacture of bottles, fibers, and other products. During the production of polyester chips, the raw materials need to be dried to remove surface moisture and prevent moisture from affecting subsequent processing. Drying towers typically use hot air or hot wind to heat and dry the polyester chips. During the drying process, the hot air carries away a large amount of waste heat from the tower; if this waste heat is not utilized, it will result in energy waste. To improve energy efficiency, many polyester manufacturers have installed waste heat recovery devices in their drying towers to recover energy using the heat from the waste gas.

[0003] Chinese Patent Publication No. CN215373626U discloses a waste heat recovery device for a latex powder drying tower. The key technical features include a water-filled tank; an inlet pipe connected to the inside of the tank is located on the upper part of the side wall of the tank; an outlet pipe connected to the inside of the tank is located on the lower part of the side wall of the tank; a tank cover is threaded onto the upper opening of the tank; a stirring mechanism is installed on the tank cover; a solenoid valve one is installed on the inlet pipe; a solenoid valve two is installed on the outlet pipe; an air inlet and a liquid outlet are respectively located on the left and right side walls of the tank; the air inlet and the liquid outlet are connected within the tank via an air guide pipe; the air inlet is connected to the interior of the latex powder drying tower via an air inlet pipe; a liquid collection tank is located on one side of the tank; the liquid outlet is connected to the liquid collection tank via an outlet pipe; and a vacuum pump is installed on the air inlet pipe.

[0004] In the above scheme, the waste heat of the drying tower is recovered through the air pump, the box and the air pipe, and the impurities in the waste heat are filtered through the filter box and the filter screen. This has the following disadvantage: the entire unit needs to be shut down when the filter screen is maintained or replaced. Utility Model Content

[0005] The purpose of this invention is to provide a waste heat recovery device for a drying tower, so as to solve the problem that the entire device needs to be shut down for maintenance or replacement of the filter screen.

[0006] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a waste heat recovery device for a drying tower, comprising a three-way pipe, the three-way pipe being fixedly connected to the right side of the drying tower body, two filter boxes being provided on the right side of the drying tower body, the two filter boxes being respectively fixedly connected to one end of the three-way pipe, mounting holes being provided on the top surface of the two filter boxes, and filter screens being detachably installed inside the two mounting holes, a housing being provided on the right side of the filter box, an air pump being fixedly provided on the left side of the housing, an air guide pipe being fixedly connected between the output end of the air pump and the housing, a main pipe being fixedly provided at the input end of the air pump, branch pipes being fixedly connected between the right side of the two filter boxes and the main pipe, and a first solenoid valve being provided on each of the two branch pipes, a PLC controller being fixedly provided on the front side of the housing, and the air pump and the first solenoid valves being electrically connected to the PLC controller.

[0007] Preferably, a liquid collection tank is provided on the right side of the box body, the right end of the air guide pipe passes through the box body and is connected and fixed to the left side of the liquid collection tank, a water outlet pipe is connected and fixed to the left side of the box body, a second solenoid valve is provided on the water outlet pipe, a water inlet pipe is connected and fixed to the left side of the box body, a third solenoid valve is provided on the water inlet pipe, a temperature sensor is connected and fixed to the front side of the box body, and the second solenoid valve, the third solenoid valve and the temperature sensor are all electrically connected to the PLC controller.

[0008] Preferably, the top surfaces of the two filter boxes are respectively provided with two threaded grooves, the top surfaces of the two filter screens are respectively fixed with connecting plates, the top surfaces of the two connecting plates are respectively provided with threaded holes, the two threaded holes are respectively threaded with bolts, and the threaded ends of the two bolts are respectively threaded with the inside of the two threaded grooves.

[0009] Preferably, positioning blocks are fixed on the left and right sides of the two connecting plates respectively, and positioning grooves are provided on the left and right sides of the inner walls of the two mounting holes respectively, and the two positioning grooves respectively position the two positioning blocks.

[0010] Preferably, a sealing ring is fixed to the bottom surface of each of the two connecting plates.

[0011] Preferably, a motor is fixed on the top surface of the housing, the motor is electrically connected to the PLC controller, the output shaft of the motor passes through the housing and is fixed with a rotating shaft, and several stirring plates are fixed on the left and right sides of the outer wall of the rotating shaft.

[0012] Compared with existing technologies, the waste heat recovery device for a drying tower that adopts the above technical solution has the following beneficial effects:

[0013] I. In use, through the coordinated action of the three-way pipe, filter box, mounting hole, filter screen, box body, air pump, air guide pipe, main pipe, branch pipe, first solenoid valve and PLC controller, the waste heat of the drying tower body is recovered, and impurities in the waste heat gas are filtered. At the same time, the filter screen can be maintained or replaced without stopping the machine, which improves the continuity and stability of the operation of the device and enhances the overall production efficiency.

[0014] Second, during use, it facilitates the disassembly and assembly of the filter screen by the staff, making maintenance or replacement convenient. When the staff inserts the filter screen into the installation hole, the positioning block inserts into the positioning groove, which plays an auxiliary positioning role, making the threaded hole correspond to the threaded groove, thus improving the convenience of installation;

[0015] Third, during use, it prevents hot air from leaking out from the connection between the connecting plate and the mounting hole, ensuring that all hot air passes through the filter screen and improving the filtration effect. It can accelerate the rate at which cold water absorbs heat from the hot air, improve heat exchange efficiency, and allow cold water to be heated to the required temperature more quickly, thereby shortening the hot water preparation time and improving the efficiency of waste heat recovery. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of an embodiment.

[0017] Figure 2 This is a breakdown diagram of an embodiment.

[0018] Figure 3 This is a cross-sectional schematic diagram of the filter box in an embodiment.

[0019] Figure 4 This is a cross-sectional view of the enclosure in an embodiment.

[0020] In the diagram: 1. Tee pipe; 2. Drying tower body; 3. Filter box; 4. Mounting hole; 5. Filter screen; 6. Box body; 7. Air pump; 8. Air guide pipe; 9. Main pipe; 10. Branch pipe; 11. First solenoid valve; 12. PLC controller; 13. Liquid collection tank; 14. Water outlet pipe; 15. Second solenoid valve; 16. Water inlet pipe; 17. Third solenoid valve; 18. Threaded groove; 19. Connecting plate; 20. Threaded hole; 21. Bolt; 22. Positioning block; 23. Positioning groove; 24. Sealing ring; 25. Motor; 26. Rotating shaft; 27. Stirring plate. Detailed Implementation

[0021] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] like Figures 1-4As shown, a waste heat recovery device for a drying tower includes a three-way pipe 1, which is fixed to the right side of the drying tower body 2. Two filter boxes 3 are located on the right side of the drying tower body 2, each connected and fixed to one end of the three-way pipe 1. Mounting holes 4 are respectively opened on the top surface of the two filter boxes 3, and filter screens 5 are detachably installed inside each of the two mounting holes 4. A housing 6 is located on the right side of the filter box 3, and a vacuum pump 7 is fixed to the left side of the housing 6. A guide pipe 8 is fixed between the output end of the vacuum pump 7 and the housing 6, and a main pipe 9 is fixed to the input end of the vacuum pump 7. Branch pipes 10 are fixed between the right sides of the two filter boxes 3 and the main pipe 9, and each branch pipe 10 is equipped with a first solenoid valve 11. A PLC controller 12 is fixed to the front of the housing 6. The PLC controller 12 is a Siemens S7-200. The air pump 7 and the first solenoid valve 11 are electrically connected to the PLC controller 12. A liquid collection tank 13 is provided on the right side of the housing 6. The right end of the air duct 8 passes through the housing 6 and is fixed to the left side of the liquid collection tank 13. A water outlet pipe 14 is fixed to the left side of the housing 6. A second solenoid valve 15 is provided on the water outlet pipe 14. A water inlet pipe 16 is fixed to the left side of the housing 6. A third solenoid valve 17 is provided on the water inlet pipe 16. A temperature sensor is fixed to the front of the housing 6. The second solenoid valve 15, the third solenoid valve 17 and the temperature sensor are all electrically connected to the PLC controller 12.

[0023] In operation, the operator first operates the PLC controller 12 to close the second solenoid valve 15 and simultaneously open the third solenoid valve 17, steadily introducing cold water into the chamber 6 through the inlet pipe 16. Then, the air pump 7 is turned on, and the filter screen 5 is securely installed in the mounting hole 4 of the filter box 3. Initially, the first solenoid valve 11 of the branch pipe 10 on the front filter box 3 is closed, while the first solenoid valve 11 of the branch pipe 10 on the rear filter box 3 is open. When the air pump 7 starts operating, the residual heat gas in the drying tower 2 flows through the three-way pipe 1... The gas is successfully transported to the rear filter box 3. At this time, the filter screen 5 in the filter box 3 plays its full role in filtering the impurities in the waste heat gas. This effectively prevents impurities from entering the subsequent stages and affecting the operation and recovery effect of the equipment. The filtered hot gas passes through the air guide pipe 8 and continuously exchanges heat with the cold water in the box 6. The hot gas is cooled and liquefied by the cold water. The liquefied liquid flows out along the right end of the air guide pipe 8 and finally gathers in the liquid collection box 13. After purification, the liquid can be reused, realizing the recycling of resources and reducing production costs.

[0024] The cold water in the tank 6 is continuously heated after absorbing heat from the hot air. The temperature sensor measures the water temperature in real time and feeds the data back to the PLC controller 12. When the water temperature is heated to the required temperature, the staff opens the second solenoid valve 15 through the PLC controller 12 to discharge the hot water to meet the hot water needs of production or daily life.

[0025] When the filter screen 5 inside the rear filter box 3 needs maintenance or replacement, the operator does not need to stop the machine. They only need to open the first solenoid valve 11 of the branch pipe 10 on the front filter box 3 through the PLC controller 12, and at the same time close the first solenoid valve 11 of the branch pipe 10 on the rear filter box 3. The waste heat gas in the drying tower 2 will be transported to the front filter box 3 through the three-way pipe 1, and the filter screen 5 inside will continue to filter the impurities in the waste heat gas. At this time, the operator can perform maintenance or replacement on the filter screen 5 inside the rear filter box 3. When the filter screen 5 inside the front filter box 3 also needs maintenance or replacement, the same principle can be followed.

[0026] Through the coordinated action of the three-way pipe 1, filter box 3, mounting hole 4, filter screen 5, box body 6, air pump 7, air guide pipe 8, main pipe 9, branch pipe 10, first solenoid valve 11 and PLC controller 12, the waste heat of the drying tower body is recovered, and impurities in the waste heat gas are filtered. At the same time, the filter screen 5 can be maintained or replaced without stopping the machine, which improves the continuity and stability of the unit's operation and enhances the overall production efficiency.

[0027] like Figures 1-3 As shown, the top surfaces of the two filter boxes 3 are respectively provided with two threaded grooves 18, the top surfaces of the two filter screens 5 are respectively fixed with connecting plates 19, the top surfaces of the two connecting plates 19 are respectively provided with threaded holes 20, and bolts 21 are respectively threaded into the two threaded holes 20, and the threaded ends of the two bolts 21 are respectively threaded into the two threaded grooves 18.

[0028] During use, when the filter screen 5 needs maintenance or replacement, the operator only needs to unscrew the bolt 21 to unscrew it from the threaded groove 18, thereby separating the connecting plate 19 from the filter box 3 and removing the filter screen 5. When installing a new filter screen 5, align the threaded hole 20 on the connecting plate 19 on the top surface of the filter screen 5 with the threaded groove 18 on the top surface of the filter box 3, then insert the bolt 21 into the threaded hole 20 and screw it into the threaded groove 18 until the bolt 21 is tightened, thus completing the installation of the filter screen 5. This makes it easy for the operator to disassemble and install the filter screen 5 for maintenance or replacement.

[0029] like Figure 1 and Figure 2 As shown, positioning blocks 22 are fixed on the left and right sides of the two connecting plates 19 respectively, and positioning grooves 23 are opened on the left and right sides of the inner walls of the two mounting holes 4 respectively, and the two positioning grooves 23 respectively position the two positioning blocks 22.

[0030] During use, when the staff inserts the filter screen 5 into the mounting hole 4, the positioning block 22 is inserted into the positioning groove 23, which plays an auxiliary positioning role, so that the threaded hole 20 corresponds to the threaded groove 18, improving the convenience of installation.

[0031] like Figures 1-4 As shown, sealing rings 24 are fixed to the bottom surfaces of the two connecting plates 19 respectively, and a motor 25 is fixed to the top surface of the box 6. The motor 25 is electrically connected to the PLC controller 12. The output shaft of the motor 25 passes through the box 6 and is fixed with a rotating shaft 26. Several stirring plates 27 are fixed to the left and right sides of the outer wall of the rotating shaft 26.

[0032] During use, when the filter screen 5 is installed in the mounting hole 4 of the filter box 3 through the connecting plate 19, it can effectively fill the tiny gap between the connecting plate 19 and the mounting hole 4, preventing hot air from leaking out from the connection between the connecting plate 19 and the mounting hole 4, ensuring that all hot air passes through the filter screen 5 for filtration, thus improving the filtration effect. The operator starts the motor 25 through the PLC controller 12. The output shaft of the motor 25 begins to rotate, driving the rotating shaft 26 that runs through the box 6 to rotate synchronously. Several stirring plates 27 move in a circular motion with the rotation of the rotating shaft 26, stirring the liquid in the box 6. Under the stirring action of the stirring plates 27, the liquid in the box 6 continuously flows and mixes, which can accelerate the rate at which cold water absorbs heat from the hot air, improve heat exchange efficiency, and allow the cold water to be heated to the required temperature more quickly, thereby shortening the hot water preparation time and improving the efficiency of waste heat recovery.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery device of a drying tower comprising a tee pipe (1) which is communicated and fixed at the right side of a drying tower body (2), characterized in that, Two filter boxes (3) are provided on the right side of the drying tower body (2). The two filter boxes (3) are respectively connected and fixed to one end of the three-way pipe (1). The top surface of the two filter boxes (3) is respectively provided with mounting holes (4). The interior of the two mounting holes (4) is respectively detachably equipped with filter screens (5). The right side of the filter box (3) is provided with a box body (6). The left side of the box body (6) is fixed with a vacuum pump (7). The output end of the vacuum pump (7) is connected and fixed with the box body (6) with a guide pipe (8). The input end of the vacuum pump (7) is fixed with a main pipe (9). The right side of the two filter boxes (3) is connected and fixed with the main pipe (9) with a branch pipe (10). The two branch pipes (10) are each provided with a first solenoid valve (11). The front side of the box body (6) is fixed with a PLC controller (12). The vacuum pump (7) and the first solenoid valve (11) are both electrically connected to the PLC controller (12).

2. A device for recovering waste heat from a drying tower according to claim 1, characterized in that: A liquid collection tank (13) is provided on the right side of the box (6). The right end of the air guide pipe (8) passes through the box (6) and is connected and fixed to the left side of the liquid collection tank (13). A water outlet pipe (14) is connected and fixed to the left side of the box (6). A second solenoid valve (15) is provided on the water outlet pipe (14). A water inlet pipe (16) is connected and fixed to the left side of the box (6). A third solenoid valve (17) is provided on the water inlet pipe (16). A temperature sensor is connected and fixed to the front side of the box (6). The second solenoid valve (15), the third solenoid valve (17) and the temperature sensor are all electrically connected to the PLC controller (12).

3. A device for recovering waste heat from a drying tower according to claim 2, characterized in that: The top surfaces of the two filter boxes (3) are respectively provided with two threaded grooves (18), the top surfaces of the two filter screens (5) are respectively fixed with connecting plates (19), the top surfaces of the two connecting plates (19) are respectively provided with threaded holes (20), the two threaded holes (20) are respectively threaded with bolts (21), and the threaded ends of the two bolts (21) are respectively threaded with the internal threads of the two threaded grooves (18).

4. A device for recovering waste heat from a drying tower according to claim 3, characterized in that: Positioning blocks (22) are fixed on the left and right sides of the two connecting plates (19), and positioning grooves (23) are provided on the left and right sides of the inner walls of the two mounting holes (4), and the two positioning grooves (23) respectively position the two positioning blocks (22).

5. A waste heat recovery device for a drying tower according to claim 3, characterized in that: Sealing rings (24) are fixed to the bottom surfaces of the two connecting plates (19).

6. The waste heat recovery device for a drying tower according to claim 2, characterized in that: A motor (25) is fixed on the top surface of the box (6). The motor (25) is electrically connected to the PLC controller (12). The output shaft of the motor (25) passes through the box (6) and is fixed with a rotating shaft (26). Several stirring plates (27) are fixed on the left and right sides of the outer wall of the rotating shaft (26).

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