A waste heat recovery device for plywood production

Abstract

This utility model relates to the field of plywood production and discloses a waste heat recovery device for plywood production. The device includes a base plate, a water tank on top of the base plate, a support fixedly connected to the top of the water tank, and a heat exchange box fixedly connected to the top of the support. The heat exchange box has two heat exchange slots inside its cavity, and a cover plate symmetrically arranged on the top of the heat exchange box. Heat exchange tubes are installed inside the heat exchange slots. When cleaning the heat exchange tubes, this waste heat recovery device closes the inlet pipe, exhaust pipe, and external solenoid valves of the connecting pipe on one side of the used heat exchange slot. While continuing to recover waste heat using the clean heat exchange slot on the other side, the solenoid valve outside the water injection pipe on the side of the heat exchange tube to be cleaned is opened, pumping water into the cleaning spray pipe and spraying it onto the heat exchange tube with attached impurities. Simultaneously, an electric push rod is activated to drive a U-shaped frame along with a brush to scrape and clean the heat exchange tube. This solves the problem of existing recovery devices having difficulty cleaning the interior, which affects waste heat recovery.

Description

Technical Field

[0001] This utility model relates to the field of plywood production technology, specifically to a waste heat recovery device for plywood production. Background Technology

[0002] Plywood production involves rotary cutting or slicing logs of a certain size to obtain veneers, followed by drying, gluing, assembly, hot pressing, and other processes to finally produce products that meet national standards and the standards agreed upon by both the supplier and the buyer.

[0003] Patent CN211641398U discloses a waste heat recovery device for printing production. It includes a base, a heat exchange box, an air inlet pipe, a fan, a connecting pipe, a suction hood, an exhaust pipe, a water inlet pipe, a spiral heat exchange tube, a water outlet pipe, a water tank, a filter box, a filter screen cylinder, and a discharge pipe. The heat exchange box has an internal cavity. The device evenly places the suction hood in the printing workshop. The fan guides hot air into the heat exchange box to fully contact the spiral heat exchange tube. The water in the spiral heat exchange tube absorbs the heat. The corrugated tube has a large contact area with the hot air, resulting in a good heat exchange effect. At the same time, the filter screen removes ink dust from the hot air, reducing air pollution.

[0004] However, the existing device directly introduces the flue gas with waste heat into the heat exchange box to heat the water in the spiral heat exchange tube. But the dust or other substances contained in the flue gas in the heat exchange box will inevitably cause a lot of impurities to adhere to the outside of the spiral heat exchange tube if they are in direct contact with the spiral heat exchange tube for a long time. This will affect the waste heat heating of the water in the spiral heat exchange tube, that is, affect the recovery of waste heat. To address this issue, a waste heat recovery device for plywood production is proposed to solve the problem that the existing recovery device is difficult to clean and thus affects the recovery of waste heat. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a waste heat recovery device for plywood production, which solves the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for plywood production, comprising a base plate, a water tank on the top of the base plate, a support fixedly connected to the top of the water tank, a heat exchange box fixedly connected to the top of the support, two heat exchange slots inside the heat exchange box, symmetrically arranged cover plates on the top of the heat exchange box, heat exchange tubes inside the heat exchange slots, an inlet pipe and an outlet pipe at both ends of the heat exchange box, a processing mechanism on the top of the base plate, and a water pump on the top of the water tank. The water pump has two symmetrically arranged connecting pipes at its top, and a water injection pipe is arranged outside the connecting pipes. The heat exchange box has a waste liquid pipe at its bottom, and a waste liquid tank is arranged at the top of the water tank. U-shaped frames are symmetrically arranged through both sides of the heat exchange box. Two brushes are symmetrically arranged inside the U-shaped frame. Two electric push rods are symmetrically fixed at the bottom of the support. Solenoid valves are arranged on the outer ring of the air inlet pipe, exhaust pipe, connecting pipe, water injection pipe, and waste liquid pipe. A cleaning spray pipe is arranged inside the cover plate. A sealing plate is fixedly connected at the intersection of the U-shaped frame and the heat exchange box.

[0007] Preferably, the water tank has an inlet at the top and a sealing plug inside the inlet; a drain pipe is provided at one end of the water tank and a valve is provided outside the drain pipe; the heat exchange pipe is connected to the water tank and the connecting pipe; and a conical groove is provided at the bottom of the inner cavity of the heat exchange tank, which is connected to the waste liquid pipe.

[0008] Preferably, the air inlet pipe is interconnected with both heat exchange tanks in the heat exchange box, the exhaust pipe is interconnected with both heat exchange tanks in the heat exchange box, the connecting pipe is interconnected with the heat exchange tanks, the water injection pipe is interconnected with the connecting pipe, and the waste liquid pipe is interconnected with both the heat exchange box and the waste liquid tank.

[0009] Preferably, the electric push rod is fixedly connected to the U-shaped frame. When the U-shaped frame is moved into the heat exchange tank, the brush and the heat exchange tube are in flexible compression contact. The water injection pipe is interconnected with the cleaning spray pipe. The weight of the cover plate is greater than the impact force of the water sprayed from the cleaning spray pipe.

[0010] Preferably, the treatment mechanism includes a treatment box located at one end of the water tank, a drain pipe is provided on one side of the treatment box and a control valve is provided outside the drain pipe, and an inlet is provided on the top of the treatment box.

[0011] Preferably, a filter box is provided at one end of the processing box, and a slot is provided at the upper position where the processing box and the filter box intersect. A filter element is provided inside the filter box, and a second exhaust pipe is provided at one end of the filter box.

[0012] This waste heat recovery device for plywood production, when the heat exchange tubes need cleaning, closes the solenoid valves on the outside of the air inlet pipe, exhaust pipe, and connecting pipe on the side of the used heat exchange tank. While continuing to recover waste heat using the clean heat exchange tank on the other side, the solenoid valve on the outside of the water injection pipe on the side of the heat exchange tube to be cleaned is opened, water is pumped into the cleaning spray pipe and sprayed onto the heat exchange tube with attached impurities. At the same time, the electric push rod is activated to drive the U-shaped frame along with the brush to scrape and clean the heat exchange tube. This solves the problem of existing recovery devices having difficulty cleaning the inside, which affects waste heat recovery.

[0013] In this waste heat recovery device for plywood production, the temperature of high-temperature flue gas is reduced by the heat exchange tubes in the heat exchange box, and then discharged into the water in the treatment box through the exhaust pipe. This process treats water-soluble substances in the flue gas. The flue gas then passes through the slot into the filter box, where it is further treated by the internal filter element before being discharged through the second exhaust pipe, thus improving the flue gas treatment effect of this waste heat recovery device for plywood production. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the present utility model;

[0015] Figure 2 This is a right view of the structure of this utility model;

[0016] Figure 3 The structure of this utility model Figure 2 Sectional view at point AA;

[0017] Figure 4 This is a structural diagram of the present utility model;

[0018] Figure 5 This is a cross-sectional view of the structure of this utility model.

[0019] In the diagram: 1. Base plate; 2. Water tank; 3. Air inlet pipe; 4. Support; 5. Heat exchange box; 6. Cover plate; 7. Heat exchange tube; 8. Exhaust pipe; 9. Processing mechanism; 901. Processing box; 902. Drain pipe; 903. Filter box; 904. Groove; 905. Filter element; 906. Second exhaust pipe; 10. Water pump; 11. Connecting pipe; 12. Water injection pipe; 13. Waste liquid pipe; 14. Waste liquid tank; 15. U-shaped frame; 16. Brush; 17. Electric push rod; 18. Solenoid valve; 19. Cleaning spray pipe; 20. Sealing plate. Detailed Implementation

[0020] 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.

[0021] Example: Please refer to Figure 1-5 A waste heat recovery device for plywood production includes a base plate 1, a water tank 2 on the top of the base plate 1, a support 4 fixedly connected to the top of the water tank 2, a heat exchange box 5 fixedly connected to the top of the support 4, two heat exchange slots inside the heat exchange box 5, a cover plate 6 symmetrically arranged on the top of the heat exchange box 5, heat exchange pipes 7 inside the heat exchange slots, an air inlet pipe 3 and an exhaust pipe 8 respectively at both ends of the heat exchange box 5, a processing mechanism 9 on the top of the base plate 1, a water pump 10 on the top of the water tank 2, and two connecting pipes 11 symmetrically arranged on the top of the water pump 10. A water injection pipe 12 is provided on the outside of the connecting pipe 11. A waste liquid pipe 13 is provided at the bottom of the heat exchange box 5. A waste liquid tank 14 is provided at the top of the water tank 2. A U-shaped frame 15 is provided through and symmetrically on both sides of the heat exchange box 5. Two brushes 16 are symmetrically arranged inside the U-shaped frame 15. Two electric push rods 17 are symmetrically fixed at the bottom of the support 4. Solenoid valves 18 are provided on the outer ring of the air inlet pipe 3, the exhaust pipe 8, the connecting pipe 11, the water injection pipe 12, and the waste liquid pipe 13. A cleaning spray pipe 19 is provided inside the cover plate 6. A sealing plate 20 is fixedly connected at the intersection of the U-shaped frame 15 and the heat exchange box 5.

[0022] Furthermore, the top of the water tank 2 is provided with a water inlet and a sealing plug is provided inside the water inlet. One end of the water tank 2 is provided with a drain pipe and a valve is provided outside the drain pipe. The heat exchange pipe 7 is connected to the water tank 2 and the connecting pipe 11. The bottom of the inner cavity of the heat exchange tank is provided with a conical groove, which is connected to the waste liquid pipe 13.

[0023] Furthermore, the air inlet pipe 3 is interconnected with the two heat exchange tanks in the heat exchange box 5, the exhaust pipe 8 is interconnected with the two heat exchange tanks in the heat exchange box 5, the connecting pipe 11 is interconnected with the heat exchange tanks, the water injection pipe 12 is interconnected with the connecting pipe 11, and the waste liquid pipe 13 is interconnected with both the heat exchange box 5 and the waste liquid tank 14.

[0024] Furthermore, the electric push rod 17 is fixedly connected to the U-shaped frame 15. When the U-shaped frame 15 is moved into the heat exchange tank, the brush 16 and the heat exchange tube 7 are in flexible compression contact. The water injection pipe 12 is interconnected with the cleaning spray pipe 19. The weight of the cover plate 6 is greater than the impact force of the water sprayed from the cleaning spray pipe 19.

[0025] Furthermore, the processing mechanism 9 includes a processing tank 901 located at one end of the water tank 2. A drain pipe 902 is provided on one side of the processing tank 901, and a control valve is provided on the outside of the drain pipe 902. An inlet is provided on the top of the processing tank 901.

[0026] Furthermore, a filter box 903 is provided at one end of the processing box 901. A slot 904 is provided at the upper part of the intersection of the processing box 901 and the filter box 903. A filter element 905 is provided inside the filter box 903. A second exhaust pipe 906 is provided at one end of the filter box 903. The temperature of the high-temperature flue gas will be reduced under the action of the heat exchange tube 7 in the heat exchange box 5, and it will be discharged into the water in the processing box 901 through the exhaust pipe 8, thereby treating the water-soluble substances in the flue gas. Then the flue gas passes through the slot 904 and enters the filter box 903, where it is further treated by the internal filter element 905 and discharged from the second exhaust pipe 906, thereby improving the flue gas treatment effect of this waste heat recovery device for plywood production.

[0027] Working Principle: When using this waste heat recovery device for plywood production, the high-temperature flue gas generated during plywood production is introduced into the heat exchange box 5 through the inlet pipe 3, and the solenoid valve 18 on one side of the inlet pipe 3 is closed. At the same time, the water pump 10 is turned on to draw low-temperature water from the water tank 2 into the heat exchange tube 7 through the connecting pipe 11. The heat introduced into the heat exchange box 5 is then used to heat the water in the heat exchange tube 7, thereby achieving the purpose of waste heat recovery. When the surface of the heat exchange tube 7 is covered with dust and impurities contained in the flue gas, the inlet pipe 3, exhaust pipe 8, and the solenoid valve 18 on the outside of the connecting pipe 11 on the used heat exchange tank side are closed. While the waste heat is being recovered using the clean heat exchange tank on the other side, the heat exchange tube to be cleaned is opened. The solenoid valve 18 on the outside of the water injection pipe 12 on one side of the tube 7 draws water into the cleaning spray pipe 19 and sprays it onto the heat exchange tube 7 with attached impurities. At the same time, the electric push rod 17 is activated to drive the U-shaped frame 15 and the brush 16 to scrape and clean the heat exchange tube 7, which solves the problem that the internal cleaning of the existing recovery device is difficult and affects the waste heat recovery. By opening and closing the solenoid valves 18 on the outside of each pipe, the high-temperature flue gas does not need to be stopped during the cleaning of the heat exchange tube 7, thus ensuring the waste heat recovery efficiency of this device. The wastewater containing impurities generated during the cleaning of the heat exchange tube 7 will accumulate in the heat exchange tank. At this time, the solenoid valve 18 on the outside of the waste liquid pipe 13 can be opened to directly discharge the wastewater into the waste liquid tank 14.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for plywood production comprising a base plate (1), characterized in that: A water tank (2) is provided on the top of the base plate (1). A bracket (4) is fixedly connected to the top of the water tank (2). A heat exchange box (5) is fixedly connected to the top of the bracket (4). The inner cavity of the heat exchange box (5) is provided with two heat exchange slots. A cover plate (6) is symmetrically provided on the top of the heat exchange box (5). A heat exchange tube (7) is provided in the inner cavity of the heat exchange slot. An air inlet pipe (3) and an exhaust pipe (8) are respectively provided at both ends of the heat exchange box (5). A processing mechanism (9) is provided on the top of the base plate (1). A water pump (10) is provided on the top of the water tank (2). Two connecting pipes (11) are symmetrically provided on the top of the water pump (10). An injection port is provided on the outside of the connecting pipes (11). Water pipe (12), waste liquid pipe (13) is provided at the bottom of the heat exchange box (5), waste liquid tank (14) is provided at the top of the water tank (2), U-shaped frame (15) is provided through and symmetrically on both sides of the heat exchange box (5), two brushes (16) are symmetrically provided in the inner cavity of the U-shaped frame (15), two electric push rods (17) are symmetrically fixed at the bottom of the support (4), solenoid valves (18) are provided on the outer ring of the air inlet pipe (3), exhaust pipe (8), connecting pipe (11), water injection pipe (12), and waste liquid pipe (13), cleaning spray pipe (19) is provided inside the cover plate (6), and sealing plate (20) is fixedly connected at the intersection of the U-shaped frame (15) and the heat exchange box (5).

2. The waste heat recovery device for plywood production according to claim 1, characterized in that: The water tank (2) has an inlet at the top and a sealing plug inside the inlet. One end of the water tank (2) has a drain pipe and a valve outside the drain pipe. The heat exchange pipe (7) is connected to the water tank (2) and the connecting pipe (11). The bottom of the inner cavity of the heat exchange tank has a conical groove, which is connected to the waste liquid pipe (13).

3. The waste heat recovery device for plywood production according to claim 1, characterized in that: The air inlet pipe (3) is interconnected with the two heat exchange tanks in the heat exchange box (5), the exhaust pipe (8) is interconnected with the two heat exchange tanks in the heat exchange box (5), the connecting pipe (11) is interconnected with the heat exchange tanks, the water injection pipe (12) is interconnected with the connecting pipe (11), and the waste liquid pipe (13) is interconnected with both the heat exchange box (5) and the waste liquid tank (14).

4. The waste heat recovery device for plywood production according to claim 1, characterized in that: The electric push rod (17) is fixedly connected to the U-shaped frame (15). When the U-shaped frame (15) is moved into the heat exchange tank, the brush (16) and the heat exchange tube (7) are in flexible compression contact. The water injection pipe (12) is interconnected with the cleaning spray pipe (19). The weight of the cover plate (6) is greater than the impact force of the water sprayed from the cleaning spray pipe (19).

5. The waste heat recovery device for plywood production according to claim 1, characterized in that: The processing mechanism (9) includes a processing tank (901) located at one end of the water tank (2). A drain pipe (902) is provided on one side of the processing tank (901), and a control valve is provided on the outside of the drain pipe (902). An inlet is provided on the top of the processing tank (901).

6. The waste heat recovery device for plywood production according to claim 5, characterized in that: One end of the processing box (901) is provided with a filter box (903), the upper position of the intersection of the processing box (901) and the filter box (903) is provided with a notch (904), the inside of the filter box (903) is provided with a filter core (905), one end of the filter box (903) is provided with a second exhaust pipe (906).

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