Energy-saving paper drying device with waste heat recovery

Abstract

The application discloses an energy-saving paper drying processing device with waste heat recovery, which comprises a drying box and a plate heat exchanger. A fixing rod is fixedly connected to the center of the top of the drying box. The drying box is fixedly connected with the plate heat exchanger through the fixing rod. Drying cavities are formed in the upper and lower sides of the inside of the drying box. A plurality of gas outlets are formed in the sides corresponding to the two drying cavities. The gas outlets and the inner cavities of the drying box are in interpenetrating arrangement. A, B, C and D installation pipes are arranged at the bottom of the plate heat exchanger. Transmission mechanisms are arranged on the front and back sides of the drying box. The plate heat exchanger realizes countercurrent heat exchange of drying waste gas and fresh air. The high-temperature wet waste gas discharged by drying transfers heat to normal-temperature fresh air entering the system in the heat exchanger, so that the fresh air is preheated before entering the main heating device, the energy consumption of the main heating device is greatly reduced, and the problems of direct discharge of waste gas heat and serious energy waste in the prior art are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of paper drying technology, specifically to an energy-saving paper drying and processing device with waste heat recovery. Background Technology

[0002] In the paper production process, wet paper, printing paper, and paper products usually need to go through a hot air drying process to remove moisture and improve product stability. Currently, the commonly used mesh belt or drum dryers in the industry generally use electric heating, steam heating or gas heating to introduce high-temperature hot air into the drying chamber. After the hot air comes into contact with the wet material, it takes away the moisture and forms high-temperature and high-humidity exhaust gas that is directly discharged.

[0003] The existing technology has the following shortcomings: the temperature of the exhaust gas discharged during the drying process is generally between 50 and 90°C, and it contains a large amount of recoverable sensible heat. This heat is directly discharged with the exhaust gas and is not effectively utilized, resulting in a large load on the main heating device and high operating costs, which is not in line with the current development trend of energy conservation and consumption reduction. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: An energy-saving paper drying and processing device with waste heat recovery includes a drying chamber and a plate heat exchanger. A fixing rod is fixedly connected to the center of the top of the drying chamber, and the drying chamber is fixedly connected to the plate heat exchanger through the fixing rod. Drying chambers are opened on both the upper and lower sides inside the drying chamber. Several air outlets are opened on the corresponding side of the two drying chambers. The air outlets are interconnected with the inner cavity of the drying chamber. A, B, C, and D mounting pipes are provided at the bottom of the plate heat exchanger. A transmission mechanism is provided on both the front and rear sides of the drying chamber.

[0005] Preferably, sealing plates are provided on both the left and right sides of the drying chamber, and the sealing plates are fixedly connected to the outside of the drying box. The A mounting pipe is fixedly connected to a second transmission pipe, and the other end of the second transmission pipe is fixedly connected to the sealing plate located near the bottom on the right side. The B mounting pipe is fixedly connected to a first transmission pipe, and the other end of the first transmission pipe is fixedly connected to the sealing plate located near the top on the left side. The C mounting pipe is fixedly connected to a third transmission pipe, and the other end of the third transmission pipe is fixedly connected to the sealing plate located near the top on the right side. The D mounting pipe is fixedly connected to a fourth transmission pipe, and the other end of the fourth transmission pipe is fixedly connected to the sealing plate located near the bottom on the left side. A paper dust filter is installed inside the fourth transmission pipe.

[0006] A fresh air fan is located on the right side of the drying chamber near the rear. An exhaust fan is located at the bottom of the fresh air fan. An L-shaped connecting plate is fixedly connected to the left side of both the fresh air fan and the exhaust fan. The other side of the L-shaped connecting plate is fixedly connected to the drying chamber. Connecting pipes are fixedly connected to the front of both the fresh air fan and the exhaust fan. The front end of the upper connecting pipe is sealed to the third transmission pipe, and the front end of the lower connecting pipe is sealed to the second transmission pipe.

[0007] Preferably, a connecting cover is fixedly connected to both the left and right sides of the drying oven, and a mounting frame is fixedly connected to the center of the inner side of the connecting cover. Two limiting plates are fixedly connected to the top of the mounting frame and the bottom of the inner cavity of the connecting cover. Each pair of adjacent limiting plates is symmetrically arranged front and back. A heat insulation curtain is fixedly connected to the top of the inner cavity of the connecting cover and the bottom of the mounting frame.

[0008] Preferably, the transmission mechanism includes a plurality of rollers arranged linearly from left to right. The rollers are located in the inner cavity of the drying chamber. A first rotating shaft is fixedly connected to the center of the upper roller, and a second rotating shaft is fixedly connected to the center of the lower roller. Both the first and second rotating shafts penetrate the inner cavity of the drying chamber.

[0009] Preferably, an upper grooved wheel is fixedly connected to the end of the first rotating shaft away from the drying box, and a lower grooved wheel is fixedly connected to the end of the second rotating shaft away from the drying box. A synchronous belt is sleeved on the outer side of both the upper and lower grooved wheels, and a drive belt is sleeved on the outer side of several lower grooved wheels. A motor is fixedly connected to the second rotating shaft located on the left side.

[0010] Preferably, a placement plate is provided on the left side of the drying box, and two flip-pressing plates are installed on the top of the placement plate. A feeding plate is fixedly connected to the right side of the limiting plate located on the right side, and support legs are fixedly connected to the bottom of the drying box near the four corners.

[0011] Preferably, the bottom of the drying box has several discharge ports, and two clamping plates are fixedly connected to the bottom of the drying box. The two clamping plates are symmetrically arranged front and back, and a baffle is attached between the two clamping plates. A pull rod is fixedly connected to the left side of the baffle. A positioning block is fixedly connected to the bottom of the drying box near the left side, and a limit block is fixedly connected to the bottom of the drying box near the right side. The left side of the baffle is attached to the positioning block.

[0012] Preferably, overflow prevention boxes are provided on both the left and right sides of the drying box near the bottom. The overflow prevention boxes are fixedly connected to the connecting cover. A horn cover is fixedly connected to the rear side of both the fresh air fan and the exhaust fan. An upper air supply pipe is inserted into the rear side of the upper horn cover, and a lower air supply pipe is inserted into the rear side of the lower horn cover. The other end of the lower air supply pipe is fixedly connected to the overflow prevention box on the left side, and the other end of the upper air supply pipe is fixedly connected to the overflow prevention box on the right side. An inclined plate is fixedly connected to the top of the overflow prevention box.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention achieves counter-current heat exchange between drying exhaust gas and fresh air through a plate heat exchanger. The high-temperature wet exhaust gas discharged from the dryer transfers heat to the ambient-temperature fresh air entering the system within the heat exchanger, preheating the fresh air before it enters the main heating device. This significantly reduces the energy consumption of the main heating device and effectively solves the problem of direct exhaust heat discharge and serious energy waste in the prior art.

[0014] This invention utilizes the cooperation between components such as a fresh air fan, connecting pipe, L-shaped connecting plate, upper air supply pipe, and lower air supply pipe to isolate the hot air overflowing from both sides of the drying chamber, thereby reducing drying energy consumption. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a right view of the structure of the present invention; Figure 3 This is a rear view of the structure of the present invention; Figure 4 This is a bottom view of the plate heat exchanger structure of the present invention; Figure 5 This is a schematic diagram of the plate heat exchanger structure of the present invention; Figure 6 This is a schematic diagram of the connecting cover structure of the present invention; Figure 7 This is a schematic diagram of the drying oven structure of the present invention; Figure 8 This is a bottom view of the drying oven of the present invention; Figure 9 This is a bottom view of the drying oven structure of the present invention; Figure 10 This is a schematic diagram of the transmission mechanism structure of the present invention; Figure 11 This is a schematic diagram of the fresh air fan structure of the present invention; Figure 12 This is a schematic diagram of the baffle structure of the present invention.

[0016] The diagram shows the following components: 1. Drying oven; 2. Support leg; 3. Plate heat exchanger; 4. First transmission pipe; 5. Second transmission pipe; 6. Third transmission pipe; 7. Feeding plate; 8. Placement plate; 9. Tilting and pressing plate; 10. Lower air supply pipe; 11. Upper air supply pipe; 12. Fourth transmission pipe; 13. Fresh air fan; 14. Exhaust air fan; 15. L-shaped connecting plate; 16. Connecting pipe; 17. Horn cover; 18. Connecting cover; 19. Limiting plate; 20. Heat insulation curtain; 21. Mounting bracket; 22. Baffle; 23. Pull rod; 24. Fixing rod; 25. Clamping plate; 26. Positioning block; 27. Limiting block; 28. Roller; 29. ​​Motor; 30. Upper grooved pulley; 31. Synchronous belt; 32. Drive belt; 33. Lower grooved pulley; 34. Overflow box. Detailed Implementation

[0017] Please see Figure 1-12 The present invention provides a technical solution: An energy-saving paper drying and processing device with waste heat recovery includes a drying chamber 1 and a plate heat exchanger 3. A fixing rod 24 is fixedly connected to the center of the top of the drying chamber 1. The drying chamber 1 is fixedly connected to the plate heat exchanger 3 through the fixing rod 24. Drying chambers are opened on both the upper and lower sides inside the drying chamber 1. Several air outlets are opened on the corresponding side of the two drying chambers. The air outlets are interconnected with the inner cavity of the drying chamber 1. A, B, C and D mounting pipes are provided at the bottom of the plate heat exchanger 3. A transmission mechanism is provided on both the front and rear sides of the drying chamber 1.

[0018] Sealing plates are installed on both the left and right sides of the drying chamber, and the sealing plates are fixedly connected to the outside of the drying box 1. Installation pipe A is fixedly connected to a second transmission pipe 5, and the other end of the second transmission pipe 5 is fixedly connected to a sealing plate located near the bottom on the right side. Installation pipe B is fixedly connected to a first transmission pipe 4, and the other end of the first transmission pipe 4 is fixedly connected to a sealing plate located near the top on the left side. Installation pipe C is fixedly connected to a third transmission pipe 6, and the other end of the third transmission pipe 6 is fixedly connected to a sealing plate located near the top on the right side. Installation pipe D is fixedly connected to a fourth transmission pipe 12, and the other end of the fourth transmission pipe 12 is fixedly connected to a sealing plate located near the bottom on the left side. A paper dust filter is installed inside the fourth transmission pipe 12. A fresh air fan 13 is installed on the right side of the drying box 1 near the rear, and an exhaust fan is installed at the bottom of the fresh air fan 13. 14. Both the fresh air fan 13 and the exhaust fan 14 have L-shaped connecting plates 15 fixedly connected to their left sides. The other side of the L-shaped connecting plates 15 is fixedly connected to the drying chamber 1. Both the fresh air fan 13 and the exhaust fan 14 have connecting pipes 16 fixedly connected to their front sides. The front end of the upper connecting pipe 16 is sealed to the third transmission pipe 6, and the front end of the lower connecting pipe 16 is sealed to the second transmission pipe 5. Both the left and right sides of the drying chamber 1 have connecting covers 18 fixedly connected. A mounting bracket 21 is fixedly connected to the center of the inner side of the connecting cover 18. Two limiting plates 19 are fixedly connected to the top of the mounting bracket 21 and the bottom of the inner cavity of the connecting cover 18. Each pair of adjacent limiting plates 19 are symmetrically arranged front and back. Heat insulation curtains 20 are fixedly connected to the top of the inner cavity of the connecting cover 18 and the bottom of the mounting bracket 21. The heat insulation curtains 20 are made of fluororubber. The transmission mechanism includes several rollers 28 arranged linearly from left to right. The rollers 28 are located within the inner cavity of the drying chamber 1. A first rotating shaft is fixedly connected to the center of the upper roller 28, and a second rotating shaft is fixedly connected to the center of the lower roller 28. Both the first and second rotating shafts penetrate the inner cavity of the drying chamber 1. An upper grooved wheel 30 is fixedly connected to the end of the first rotating shaft away from the drying chamber 1, and a lower grooved wheel 33 is fixedly connected to the end of the second rotating shaft away from the drying chamber 1. A synchronous belt 31 is sleeved on the outer sides of both the upper and lower grooved wheels 30, and a drive belt 32 is sleeved on the outer sides of several lower grooved wheels 33. A motor 29 is fixedly connected to the second rotating shaft on the left side. A placement plate 8 is provided on the left side of the drying chamber 1, with two flip-pressing plates 9 installed on the top of the placement plate 8. A feeding plate 7 is fixedly connected to the right side of the limiting plate 19 on the right side. Support legs 2 are fixedly connected to the bottom of the drying chamber 1 near the four corners. Several openings are provided at the bottom of the drying chamber 1. The dryer has a feed inlet. Two clamping plates 25 are fixedly connected to the bottom of the drying chamber 1. These plates 25 are symmetrically arranged front and back, and a baffle 22 is attached between them. A pull rod 23 is fixedly connected to the left side of the baffle 22. A positioning block 26 is fixedly connected to the bottom of the drying chamber 1 near the left side, and a limit block 27 is fixedly connected to the bottom of the drying chamber 1 near the right side. The left side of the baffle 22 is attached to the positioning block 26. Overflow boxes 34 are installed on both sides of the drying chamber 1 near the bottom to prevent overflow. The overflow box 34 is fixedly connected to the connecting cover 18. The rear sides of the fresh air fan 13 and the exhaust fan 14 are both fixedly connected to the horn cover 17. The upper air supply pipe 11 is inserted into the rear side of the upper horn cover 17, and the lower air supply pipe 10 is inserted into the rear side of the lower horn cover 17. The other end of the lower air supply pipe 10 is fixedly connected to the overflow box 34 on the left side, and the other end of the upper air supply pipe 11 is fixedly connected to the overflow box 34 on the right side. The top of the overflow box 34 is fixedly connected to the inclined plate.

[0019] Working principle: When outdoor air intake is required, the fresh air fan 13 starts, drawing in ambient temperature fresh air from the outside and sending it through the upper connecting pipe 16 into the third transmission pipe 6. The ambient temperature fresh air then enters the plate heat exchanger 3 through the third transmission pipe 6 and pipe C. Inside the plate heat exchanger 3, the fresh air flows from the upper right to the lower left, forming a counter-current convection heat exchange with the high-temperature and humid exhaust gas flowing downwards on the other side (exhaust gas side). The fresh air absorbs the heat transferred by the plates, and its temperature rises significantly. The preheated fresh air... The preheated fresh air flows out from pipe B of plate heat exchanger 3 and enters the first transmission pipe 4. It then enters the upper drying chamber via the first transmission pipe 4 and is subsequently sent to the main heating zone inside drying chamber 1. Compared to directly supplying ambient temperature air, the preheated fresh air significantly reduces the energy consumption of the main heater. The preheated fresh air penetrates the paper, carrying away moisture and becoming high-temperature, high-humidity exhaust gas. This exhaust gas passes through the lower left sealing plate and enters the fourth transmission pipe 12, which has a paper dust filter. After intercepting paper fibers and dust, it exits from pipe D of plate heat exchanger 3. The exhaust gas enters the plate heat exchanger 3 through a duct, flowing from the lower right to the upper left. It comes into counter-current contact with the ambient temperature fresh air on the other side (fresh air side), transferring heat to the fresh air through the plates. The exhaust gas itself cools significantly, and the cooled exhaust gas flows out of the duct of the plate heat exchanger 3 into the second transmission pipe 5. From there, it is sent to the exhaust gas fan 14 via the connecting pipe 16 below, and finally discharged outdoors by the exhaust gas fan 14. The high-temperature, humid exhaust gas and the ambient temperature fresh air flow counter-currently within the plate heat exchanger 3. The exhaust gas transfers heat to the fresh air through the metal plates, achieving the recovery and utilization of waste heat from the drying exhaust gas, reducing fuel or electricity consumption of the main heater. During operation, the fresh air fan 13 and the exhaust gas fan 14 are vented through the horn cover 17. Hot air is collected and transmitted to the overflow prevention box 34 through the lower air supply pipe 10 and the upper air supply pipe 11. The hot air inside the overflow prevention box 34 is blown to the left and right sides of the drying box 1 by the inclined plate. In conjunction with the heat insulation curtain 20, the overflow of hot air inside the drying box 1 is reduced. When the motor 29 is started, it can drive the adjacent lower groove wheel 33 to rotate through the power output shaft. When the lower groove wheel 33 on the left rotates, it can drive the remaining lower groove wheels 33 to rotate through the drive belt 32. When several lower groove wheels 33 rotate, they can drive the upper groove wheel 30 to rotate through the synchronous belt 31. When the upper groove wheel 30 and the lower groove wheel 33 rotate, they can drive the two rollers 28 to rotate. When the rollers 28 rotate, they can drive the placement plate 8 to move.

Claims

1. An energy-saving paper drying and processing device with waste heat recovery, comprising a drying chamber (1) and a plate heat exchanger (3), characterized in that: A fixing rod (24) is fixedly connected to the center of the top of the drying box (1). The drying box (1) is fixedly connected to the plate heat exchanger (3) through the fixing rod (24). The drying box (1) has drying chambers on both the upper and lower sides. Several air outlets are opened on the corresponding side of the two drying chambers. The air outlets are interconnected with the inner cavity of the drying box (1). The bottom of the plate heat exchanger (3) is provided with A, B, C, and D mounting pipes. The drying box (1) has a transmission mechanism on both the front and rear sides.

2. The energy-saving paper drying and processing device with waste heat recovery according to claim 1, characterized in that: Sealing plates are provided on both the left and right sides of the drying chamber. The sealing plates are fixedly connected to the outside of the drying box (1). The A mounting pipe is fixedly connected to the second transmission pipe (5). The other end of the second transmission pipe (5) is fixedly connected to the sealing plate located near the bottom on the right side. The B mounting pipe is fixedly connected to the first transmission pipe (4). The other end of the first transmission pipe (4) is fixedly connected to the sealing plate located near the top on the left side. The C mounting pipe is fixedly connected to the third transmission pipe (6). The other end of the third transmission pipe (6) is fixedly connected to the sealing plate located near the top on the right side. The D mounting pipe is fixedly connected to the fourth transmission pipe (12). The other end of the fourth transmission pipe (12) is fixedly connected to the sealing plate located near the bottom on the left side. A paper dust filter is installed in the inner cavity of the fourth transmission pipe (12).

3. The energy-saving paper drying and processing device with waste heat recovery according to claim 2, characterized in that: A fresh air fan (13) is provided on the right side of the drying box (1) near the rear side. An exhaust fan (14) is provided at the bottom of the fresh air fan (13). An L-shaped connecting plate (15) is fixedly connected to the left side of both the fresh air fan (13) and the exhaust fan (14). The other side of the L-shaped connecting plate (15) is fixedly connected to the drying box (1). A connecting pipe (16) is fixedly connected to the front side of both the fresh air fan (13) and the exhaust fan (14). The front end of the upper connecting pipe (16) is sealed to the third transmission pipe (6), and the front end of the lower connecting pipe (16) is sealed to the second transmission pipe (5).

4. The energy-saving paper drying and processing device with waste heat recovery according to claim 3, characterized in that: The drying oven (1) is fixedly connected to the left and right sides with connecting covers (18), and a mounting frame (21) is fixedly connected to the center of the inner side of the connecting cover (18). Two limiting plates (19) are fixedly connected to the top of the mounting frame (21) and the bottom of the inner cavity of the connecting cover (18). Each pair of adjacent limiting plates (19) are symmetrically arranged front and back. Heat insulation curtains (20) are fixedly connected to the top of the inner cavity of the connecting cover (18) and the bottom of the mounting frame (21).

5. The energy-saving paper drying and processing device with waste heat recovery according to claim 4, characterized in that: The transmission mechanism includes several rollers (28), which are arranged linearly from left to right. The rollers (28) are located in the inner cavity of the drying box (1). A first rotating shaft is fixedly connected to the center of the upper roller (28), and a second rotating shaft is fixedly connected to the center of the lower roller (28). Both the first rotating shaft and the second rotating shaft pass through the inner cavity of the drying box (1).

6. The energy-saving paper drying and processing device with waste heat recovery according to claim 5, characterized in that: The first rotating shaft is fixedly connected to an upper grooved wheel (30) at one end away from the drying box (1), and the second rotating shaft is fixedly connected to a lower grooved wheel (33) at one end away from the drying box (1). The upper grooved wheel (30) and the lower grooved wheel (33) are both sleeved with a synchronous belt (31), and a number of the lower grooved wheels (33) are both sleeved with a drive belt (32). The second rotating shaft located on the left side is fixedly connected to a motor (29).

7. The energy-saving paper drying and processing device with waste heat recovery according to claim 6, characterized in that: The drying box (1) has a placement plate (8) on the left side, and two flip-pressing plates (9) are installed on the top of the placement plate (8). The limiting plate (19) on the right side is fixedly connected to the feeding plate (7). The bottom of the drying box (1) is fixedly connected to the four corners with support legs (2).

8. The energy-saving paper drying and processing device with waste heat recovery according to claim 7, characterized in that: The bottom of the drying box (1) is provided with several discharge ports. Two clamping plates (25) are fixedly connected to the bottom of the drying box (1). The two clamping plates (25) are arranged symmetrically front and back. A baffle (22) is attached between the two clamping plates (25). A pull rod (23) is fixedly connected to the left side of the baffle (22). A positioning block (26) is fixedly connected to the bottom of the drying box (1) near the left side. A limit block (27) is fixedly connected to the bottom of the drying box (1) near the right side. The left side of the baffle (22) is attached to the positioning block (26).

9. The energy-saving paper drying and processing device with waste heat recovery according to claim 8, characterized in that: The drying box (1) is provided with overflow boxes (34) on both sides near the bottom. The overflow boxes (34) are fixedly connected to the connecting cover (18). The fresh air fan (13) and the exhaust fan (14) are fixedly connected to the rear side of the horn cover (17). The upper air supply pipe (11) is inserted into the rear side of the upper horn cover (17), and the lower air supply pipe (10) is inserted into the rear side of the lower horn cover (17). The other end of the lower air supply pipe (10) is fixedly connected to the overflow box (34) on the left side, and the other end of the upper air supply pipe (11) is fixedly connected to the overflow box (34) on the right side. The top of the overflow box (34) is fixedly connected to an inclined plate.

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