A curing oven tail gas waste heat recovery device

Abstract

The application discloses a curing furnace tail gas waste heat recovery device, which comprises a flue gas purification system, a heating system, a secondary filtration system and a water circulation system. The heating system comprises a heating box, a heating space is arranged in the heating box, the heating box is provided with a ventilation inlet, the ventilation inlet is communicated with the flue gas purification system, a water storage assembly is further arranged in the heating box, and the heating box is further provided with an exhaust pipe opening. The secondary filtration system comprises a filter tower with an accommodating space, the filter tower is provided with a first gas outlet and a first gas inlet, the first gas inlet is communicated with the exhaust pipe opening, a suction pump capable of sucking the gas in the heating space into the filter tower is arranged on the filter tower, a plurality of filter pieces capable of being inserted into the accommodating space are further connected to the sidewall of the filter tower, and the plurality of filter pieces are arranged in an array. The water circulation system comprises a water tank and a plurality of water distribution tanks, and the water tank is connected with a water pump. The application provides a curing furnace tail gas waste heat recovery device which can treat tail gas and utilize the heat of the tail gas.

Description

Technical Field

[0001] This invention relates to the field of curing oven exhaust gas treatment technology, and in particular to a curing oven exhaust gas waste heat recovery device. Background Technology

[0002] In industrial production processes such as coating and spraying, curing ovens are common process equipment that generate large amounts of high-temperature waste gas during operation. This waste gas not only contains residual heat resources but also often carries pollutants such as volatile organic compounds and paint mist particles. The high temperature of the waste gas emitted from curing ovens means that most of its heat energy is released directly into the atmosphere without being recovered, resulting in significant heat energy waste. Although some existing technologies attempt to recover waste heat through heat exchangers, the recovery system and the exhaust gas purification system are often designed and operated independently, failing to achieve a synergistic effect. This leads to large equipment footprints, and if the recovered heat energy is not efficiently utilized locally, it will also result in heat waste. Summary of the Invention

[0003] The purpose of this invention is to overcome the problems of the prior art and provide a waste heat recovery device for curing furnace exhaust gas that can process exhaust gas and utilize the heat of exhaust gas.

[0004] To achieve the above objectives, the present invention adopts the following solution: A waste heat recovery device for curing furnace exhaust gas includes: a flue gas purification system, a heating system, a secondary filtration system, and a water circulation system connected in sequence. The heating system includes a heating box with a heating space inside. The top of the heating box has a vent inlet connected to the flue gas purification system. The heating box also has a water storage component and an exhaust pipe on its side. The secondary filtration system includes a filter tower with an internal accommodating space. The top of the filter tower has a first air outlet, and a first air inlet on one side is connected to the exhaust pipe. The filter tower is equipped with a suction pump that can draw gas from the heating space into the filter tower. Multiple filter elements that can be inserted into the accommodating space are connected to the side wall of the filter tower and are arranged in an array. The water circulation system includes a water tank and multiple water distribution tanks connected to the water tank. The water tank is connected to a water pump that can transport water from the water tank to the water storage component.

[0005] The filter tower is also provided with an installation plate, which divides the accommodating space into an air inlet chamber communicating with the first air inlet and an exhaust chamber communicating with the first air outlet. An installation cylinder is provided between the installation plate and the side of the filter tower. The installation cylinder is provided with a plurality of first through holes on the side of the filter tower near the side of the filter tower. The filter element is rotatably connected between the installation cylinder and the filter tower.

[0006] The filter element includes an inner cylinder rotatably connected to an installation cylinder. A guide plate is provided within the inner cylinder. The guide plate includes a hollow sleeve portion and two connecting portions extending from the sleeve portion to the inner wall of the inner cylinder. The two connecting portions and the sleeve portion can cooperate to divide the inner cylinder into a first channel and a second channel spaced apart to the left and right. A third channel, a second air inlet, and a second air outlet are provided on the sleeve portion. The second air inlet is located on the side of the sleeve portion near the installation plate, and the third channel is connected to the second channel through the second air inlet. The second air outlet is located on the side of the sleeve portion near the side wall of the filter tower, and the third channel is connected to the first channel through the second air outlet. The inner cylinder also has second through holes corresponding to the positions of multiple first through holes. These multiple second through holes can communicate with the first and second channels respectively. Filter cartridges are provided in the first, second, and third channels. At least two third air outlets are provided at the top of the installation cylinder, and a fourth air outlet is provided at the top of the inner cylinder, located on one side of the first channel.

[0007] The inner cylinder has a groove on its top and a protruding post on its top. A first bearing is connected to the protruding post and the outside of the first bearing is connected to the groove. A protruding connecting shaft is also connected to the bottom of the inner cylinder. The connecting shaft is connected to a mounting base. A second bearing is provided between the mounting base and the connecting shaft. The mounting base is connected to the filter tower.

[0008] The end of the connecting shaft is provided with a rotating wheel, a drive motor is provided on one side of the filter tower, a drive wheel is connected to the output shaft of the drive motor, and a transmission belt is provided between the drive wheel and the rotating wheels in the same row.

[0009] The mounting plate is provided with a plurality of first bends that can form steps, and the filter tower is provided with a plurality of second bends on the plate surface corresponding to the position of the mounting plate. The second bends and the first bends are arranged alternately vertically so that the filter element is inclined.

[0010] The flue gas purification system includes an installation box and a channel pipe connected to the top of the installation box. The installation box is hollow and contains multiple filter plates. The installation box has an opening slot for gas to enter. Each filter plate includes an outer frame composed of multiple connecting plates. An installation slot is formed inside the outer frame. Multiple partition plates are arranged at intervals in the installation slot to divide the installation slot into multiple ventilation channels. The filter plate body is disposed between the two sides of the partition plates and the inner wall of the outer frame.

[0011] Each ventilation duct is provided with a guide plate with multiple bends, and the connecting plate is provided with multiple flanges. The flanges are located above or below the multiple partition plates, so that a snap-fit ​​space is formed between the flanges and the top or bottom surface of the partition plate, allowing the filter plate body to snap into it.

[0012] The water storage assembly includes a first water collection tank and a second water collection tank arranged vertically and horizontally within the heating space. Multiple heating circulation pipes are arranged between the first and second water collection tanks. The first water collection tank has a first water inlet, and the second water collection tank has a first water outlet. Each heating circulation pipe includes a pipe body with a fourth water inlet for receiving water and a third water outlet for discharging water. A continuous water passage is formed within the pipe body, extending from the fourth water inlet to the third water outlet. The pipe body has multiple bends. Multiple spray pipes are also connected inside the heating chamber. A fourth water outlet is located at the bottom of the heating chamber, and a water pump is connected between the fourth water outlet and the inlet of the spray pipe.

[0013] The water tank has a second inlet and a second outlet. The second inlet of the water tank is connected to the first outlet of the second collection tank. The inlet of the water distribution tank is connected to the second outlet of the water tank. The outlet of the water distribution tank is connected to an external pipe. The water tank is also provided with a third inlet connected to an external cold water pipe.

[0014] Compared with existing technologies, this invention has the following advantages: In use, the exhaust gas generated by the paint booth curing oven is collected and guided to the flue gas purification system. The flue gas purification system performs preliminary purification on the curing oven exhaust gas. The purified exhaust gas enters the heating space of the heating box in the heating system through the ventilation inlet. The water storage component in the heating space circulates cold water for heating. The waste heat from the exhaust gas heats the water flow in the pipes through the heating water storage component. The heated water is transported from the water storage component to the water tank of the water circulation system. The water tank distributes the hot water to multiple distribution tanks. The outlets of the distribution tanks are connected to external pipes, thereby… Hot water is delivered to the cleaning station to provide hot water for workpiece cleaning, effectively recovering waste heat from exhaust gas and reducing energy consumption. Simultaneously, the exhaust gas after heating the water storage component enters the secondary filtration system through the exhaust pipe. It is then drawn into the filtration tower's containment space through the first air inlet by a suction pump and undergoes deep filtration through multiple arrayed filter elements before finally being discharged through the first air outlet. This device, through the coordination of the flue gas purification system, heating system, secondary filtration system, and water circulation system, utilizes thermal energy to heat water, achieving the reuse of thermal energy and reducing thermal pollution. At the same time, it also treats the exhaust gas, making it more environmentally friendly. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the waste heat recovery device for curing furnace exhaust gas of the present invention; Figure 2 This is one of the structural schematic diagrams of the filter tower of the waste heat recovery device for curing furnace tail gas of the present invention; Figure 3 This is the second schematic diagram of the filter tower of the waste heat recovery device for curing furnace tail gas of the present invention. Figure 4 This is a cross-sectional view of the filter element of the waste heat recovery device for curing oven exhaust gas of the present invention; Figure 5 This is one of the enlarged cross-sectional views of the filter element in the waste heat recovery device for curing oven exhaust gas of the present invention; Figure 6 This is the second enlarged cross-sectional view of the filter element of the waste heat recovery device for curing oven exhaust gas of the present invention; Figure 7 This is a cross-sectional structural diagram of the waste heat recovery device for curing furnace exhaust gas of the present invention in the short-channel state. Figure 8 This is a cross-sectional structural diagram of the long channel of the waste heat recovery device for curing furnace exhaust gas of the present invention. Figure 9 This is a schematic diagram of the mounting cylinder and inner cylinder of the waste heat recovery device for curing furnace exhaust gas of the present invention; Figure 10 This is a schematic diagram of the installation cylinder of the waste heat recovery device for curing furnace exhaust gas of the present invention; Figure 11 This is one of the exploded schematic diagrams of the mounting box and filter plate of the waste heat recovery device for curing oven exhaust gas of the present invention; Figure 12 This is the second exploded schematic diagram of the mounting box and filter plate of the waste heat recovery device for curing oven exhaust gas of the present invention. Figure 13 This is a schematic diagram of the filter plate structure of the waste heat recovery device for curing furnace exhaust gas of the present invention; Figure 14 This is a schematic diagram of the air guide plate of the waste heat recovery device for curing furnace exhaust gas of the present invention; Figure 15 This is one of the structural schematic diagrams of the heating system of the waste heat recovery device for curing furnace exhaust gas of the present invention; Figure 16 This is the second schematic diagram of the heating system of the waste heat recovery device for curing furnace exhaust gas of the present invention; Figure 17 This is a cross-sectional schematic diagram of the heating system of the waste heat recovery device for curing furnace exhaust gas of the present invention; Figure 18 This is one of the structural schematic diagrams of the water circulation system of the waste heat recovery device for curing furnace tail gas of the present invention; Figure 19This is the second schematic diagram of the water circulation system of the waste heat recovery device for curing furnace tail gas of the present invention.

[0016] Feature designations: Flue gas purification system 1, mounting box 11, opening slot 111, channel pipe 12, filter plate 13, connecting plate 1311, flange 1312, outer frame 131, mounting slot 132, ventilation channel 1321, partition plate 133, filter plate body 134, air guide plate 135, snap-fit ​​space 136, heating system 2, heating box 21, heating space 211, air inlet 212, exhaust pipe outlet 213, etc. Four water outlets 214, first water collection tank 22, first water inlet 221, second water collection tank 23, first water outlet 231, heating circulation pipe 24, pipe body 241, fourth water inlet 2411, third water outlet 2412, water passage 2413, bend 2414, spray pipe 25, water pump 26, suction pump 27, secondary filtration system 3, filter tower 31, housing space 311, air inlet chamber 3111, exhaust. Cavity 3112, first air outlet 312, first air inlet 313, second bend 314, filter element 32, inner cylinder 321, first channel 3211, second channel 3212, second through hole 3213, fourth air outlet 3214, groove 3215, guide plate 322, sleeve 3221, connecting part 3222, third channel 3223, second air inlet 3224, second air outlet 3225, connecting The components include: shaft 323, mounting base 324, second bearing 325, mounting plate 33, first bending part 331, mounting cylinder 34, first through hole 341, third air outlet 342, protrusion 343, filter element 35, first bearing 36, water circulation system 4, water tank 41, second water inlet 411, second water outlet 412, third water inlet 413, water distribution tank 42, rotating wheel 51, drive motor 52, and drive wheel 53. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to embodiments: The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0018] like Figures 1 to 19 As shown, A waste heat recovery device for curing oven exhaust gas includes: a flue gas purification system 1, a heating system 2, a secondary filtration system 3, and a water circulation system 4 connected in sequence. The heating system 2 includes a heating box 21, which has a heating space 211 inside. The top of the heating box 21 has a ventilation inlet 212, which is connected to the flue gas purification system 1. The heating box 21 also has a water storage component inside, and an exhaust pipe 213 is provided on the side of the heating box 21. The secondary filtration system 3 includes a filter tower 31 with an internal receiving space 311. The top of the filter tower 31 is equipped with... The filter tower 31 has a first air outlet 312 and a first air inlet 313 on one side. The first air inlet 313 is connected to the exhaust pipe 213. The filter tower 31 is equipped with a suction pump 27 that can draw gas from the heating space 211 into the filter tower 31. The side wall of the filter tower 31 is also connected to a plurality of filter elements 32 that can be inserted into the receiving space 311. The plurality of filter elements 32 are arranged in an array. The water circulation system 4 includes a water tank 41 and a plurality of water distribution tanks 42 connected to the water tank 41. The water tank 41 is connected to a water pump 43 that can transport the water in the water tank 41 to the water storage component.

[0019] In use, the exhaust gas generated by the curing oven in the spray booth is collected and guided to the flue gas purification system 1. The flue gas purification system 1 performs preliminary purification on the exhaust gas from the curing oven. The purified exhaust gas enters the heating space 211 of the heating box 21 in the heating system 2 through the ventilation inlet 212. The water storage component in the heating space 211 circulates cold water for heating. The waste heat from the exhaust gas heats the water flow in the pipe through the heating water storage component. The heated water is transported from the water storage component to the water tank 41 of the water circulation system 4. The water tank 41 distributes the hot water to multiple water distribution tanks 42. The outlet of the water distribution tanks 42 is connected to an external pipe, thereby delivering the hot water to the cleaning area. The workstation provides hot water for workpiece cleaning, effectively recovering waste heat from exhaust gases and reducing energy consumption. Simultaneously, the exhaust gas after heating the water storage component enters the secondary filtration system 3 through the exhaust pipe 213. A suction pump then guides the gas from the first inlet 313 into the filtration tower 31's containment space 311, where it undergoes deep filtration through multiple arrayed filter elements 32 before finally exiting through the first outlet 312. This device, through the coordination of the flue gas purification system 1, heating system 2, secondary filtration system 3, and water circulation system 4, utilizes thermal energy to heat water, achieving the reuse of thermal energy and reducing thermal pollution. It also treats the exhaust gas, making it more environmentally friendly. The suction pump 27 can regulate the flow rate of the exhaust gas entering the inlet chamber 3111.

[0020] The filter tower 31 is further provided with an installation plate 33, which divides the accommodating space 311 into an intake chamber 3111 communicating with the first air inlet 313 and an exhaust chamber 3112 communicating with the first air outlet 312. An installation cylinder 34 is provided between the installation plate 33 and the side of the filter tower 31. The installation cylinder 34 has multiple first through holes 341 on the side near the side of the filter tower 31. The filter element 32 is rotatably connected between the installation cylinder 34 and the filter tower 31. The installation plate 33 divides the accommodating space 311 into independent intake chambers 3111 and exhaust chambers 3112, guiding the exhaust gas from the first air inlet 313 into the intake chamber 3111, and through multiple filter elements 32 before entering the exhaust chamber 3112, and finally exiting from the first air outlet 312. This arrangement restricts and guides the flow of exhaust gas, ensuring sufficient contact between the exhaust gas and the filter elements 32, and improving the filtration effect.

[0021] The filter element 32 includes an inner cylinder 321 rotatably connected to the mounting cylinder 34. A guide plate 322 is disposed within the inner cylinder 321. The guide plate 322 includes a hollow sleeve portion 3221 and two connecting portions 3222 extending from the sleeve portion 3221 to the inner wall of the inner cylinder 321. The two connecting portions 3222 and the sleeve portion 3221 can cooperate to divide the inner cylinder 321 into a first channel 3211 and a second channel 3212 spaced apart. A third channel 3223, a second air inlet 3224, and a second air outlet 3225 are disposed on the sleeve portion 3221. The second air inlet 3224 is located on the side of the sleeve portion 3221 adjacent to the mounting plate 33, and the third channel 3223 connects to the second air inlet 3224 via the second air inlet 3224. The two channels 3212 are connected. The second air outlet 3225 is located on the side of the sleeve 3221 near the side wall of the filter tower 31. The third channel 3223 is connected to the first channel 3211 through the second air outlet 3225. The inner cylinder 321 is also provided with a second through hole 3213 corresponding to the position of a plurality of first through holes 341. The plurality of second through holes 3213 can be connected to the first channel 3211 and the second channel 3212 respectively. Filter elements 35 are provided in the first channel 3211, the second channel 3212 and the third channel 3223. The top of the mounting cylinder 34 is provided with at least two third air outlets 342. The top of the inner cylinder 321 and located on the side of the first channel 3211 is provided with a fourth air outlet 3214.

[0022] The inner cylinder 321 is divided into a first channel 3211 and a second channel 3212 by a guide plate 322, and is provided with an independent third channel 3223. The lengths of the first channel 3211 and the second channel 3212 are equal. Through the cooperation of the second air inlet 3224 and the second air outlet 3225 provided on the sleeve part 3221 and the internal third channel 3223, a dual-mode switching can be achieved. The first mode is to use only the first channel 3211 for filtration, and the second mode is to use a long channel for filtration through the second channel 3212, the third channel 3223 and the first channel 3211 in series.

[0023] When the curing operation is at its peak and the waste gas concentration is high, requiring treatment, the inner cylinder 321 is rotated to put the waste gas treatment into a long channel mode. After passing through the first through hole 341, the waste gas enters the second channel 3212 through the second through hole 3213. The waste gas in the second channel 3212 is guided to the second air inlet 3224 and then enters the third channel 3223. The waste gas moves along the second channel 3212 to the second air outlet 3225 and then enters the first channel 3211. After being discharged from the fourth air outlet 3214 at the top of the first channel 3211, it enters the exhaust chamber 3112 through the third air outlet 342 of the mounting cylinder 34. This improves the waste gas treatment capacity and allows the waste gas to fully contact the filter element 35 in the second channel 3212, the third channel 3223, and the first channel 3211, thus meeting the waste gas treatment requirements.

[0024] When the system is in a downtime and the exhaust gas volume and concentration are low, it can switch to short-channel mode. This allows the exhaust gas to enter the first channel 3211 through the second through hole 3213, move from the bottom of the first channel 3211 to the fourth outlet 3214 after the top of the first channel 3211, and then enter the exhaust chamber 3112 through the third outlet 342 of the mounting cylinder 34. This achieves extremely high single-pass purification efficiency under low air volume and reduces the consumption of filter element 35, thereby reducing costs.

[0025] In addition, at least two third air outlets 342 provided at the top of the mounting cylinder 34 cooperate with the fourth air outlet 3214 provided on one side of the first channel 3211 at the top of the inner cylinder 321, ensuring that no matter what angle the filter element 32 is rotated to, the purified airflow inside can smoothly enter the exhaust chamber 3112 through the designed path (from the first channel 3211 through the fourth air outlet 3214 and then out through the third air outlet 342).

[0026] The inner cylinder 321 has a groove 3215 on its top, and the mounting cylinder 34 has a protruding post 343 on its top. A first bearing 36 is connected to the post 343, and the outside of the first bearing 36 is connected to the groove 3215. The bottom of the inner cylinder 321 is also connected to a protruding connecting shaft 323, and the connecting shaft 323 is connected to a mounting base 324. A second bearing 325 is provided between the mounting base 324 and the connecting shaft 323, and the mounting base 324 is connected to the filter tower 31.

[0027] The protrusion 343 at the top of the mounting cylinder 34 is connected to the groove 3215 at the top of the inner cylinder 321 via the first bearing 36. Meanwhile, the connecting shaft 323 at the bottom of the inner cylinder 321 is mounted on the mounting base 324 fixed to the filter tower 31 via the second bearing 325, ensuring that the inner cylinder 321 can rotate relative to the mounting cylinder 34, thereby changing the channel pattern. At the same time, this arrangement also facilitates disassembly. It is conceivable that in one embodiment, the inner cylinder 321 is composed of two cylinders connected by threads. This arrangement facilitates the replacement of the filter element 35 and the maintenance of the mounting cylinder 34.

[0028] The end of the connecting shaft 323 is provided with a rotating wheel 51, and a drive motor 52 is provided on one side of the filter tower 31. A drive wheel 53 is connected to the output shaft of the drive motor 52, and a transmission belt is provided between the drive wheel 53 and the rotating wheels 51 in the same row.

[0029] Driven by the drive motor 52, drive wheel 53 and transmission belt, the rotating wheel 51 of all filter elements 32 in the same row can be rotated synchronously. This eliminates the need for operators to manually operate each filter element 32. They only need to control the drive motor 52 to achieve synchronous and precise rotation of the entire row of filter elements 32. The drive motor 52 is a stepper motor, which can be precisely controlled. Driven by the drive motor 52, manual labor is reduced and work efficiency is improved.

[0030] The mounting plate 33 is provided with a plurality of first bending portions 331 that can form steps. The filter tower 31 is provided with a plurality of second bending portions 314 on the plate surface corresponding to the position of the mounting plate 33. The second bending portions 314 and the first bending portions 331 are arranged alternately vertically so that the filter element 32 is inclined.

[0031] The first bending part 331 on the mounting plate 33 and the second bending part 314 on the corresponding plate of the filter tower 31 are staggered to form a stepped mounting base, which allows the filter element 32 to be installed and fixed at a predetermined and consistent tilt angle, and allows the multiple first through holes 341 to be in an inclined state to facilitate the entry of exhaust gas.

[0032] The flue gas purification system 1 includes a mounting box 11 and a channel pipe 12 connected to the top of the mounting box 11. The mounting box 11 is hollow and contains multiple filter plates 13. The mounting box 11 has an opening slot 111 for gas to enter. Each filter plate 13 includes an outer frame 131 composed of multiple connecting plates 1311. An installation groove 132 is formed inside the outer frame 131. Multiple partition plates 133 are arranged at intervals in the installation groove 132 to divide the installation groove 132 into multiple ventilation channels 1321. Filter plate bodies 134 are arranged between the two sides of the partition plates 133 and the inner wall of the outer frame 131. The outer frame 131, composed of multiple connecting plates 1311, is easy to install and disassemble. Meanwhile, the internal mounting groove 132 provides an installation position for the partition plate 133. The partition plate 133 divides the mounting groove 132 into multiple parallel ventilation channels 1321 of the same size, so that the exhaust gas entering from the opening groove 111 is evenly distributed into each ventilation channel 1321. This prolongs the contact path and time between the exhaust gas and the filter plate body 134 located on both sides of the channel (i.e., between the side of the partition plate 133 and the inner wall of the outer frame 131), thereby improving the filtration effect.

[0033] Each ventilation channel 1321 is provided with a guide plate 135 with multiple bends, and the connecting plate 1311 is provided with multiple flanges 1312. The flanges 1312 are located above or below the multiple partition plates 133, so that a snap-fit ​​space 136 is formed between the flanges 1312 and the top or bottom surface of the partition plate 133, which allows the filter plate body 134 to be snapped in.

[0034] A guide vane 135 with multiple bends is installed in the ventilation channel 1321, which forcibly changes the straight flow path of the exhaust gas. When the exhaust gas passes through the ventilation channel 1321, it needs to follow the bend structure of the guide vane 135 to change direction, diffuse and mix, prolonging the residence time of the exhaust gas in the channel, increasing the contact opportunity with the filter plate body 134, and improving the filtration effect.

[0035] The water storage assembly includes a first water collection tank 22 and a second water collection tank 23 spaced apart vertically within a heating space 211. Multiple heating circulation pipes 24 are arranged between the first water collection tank 22 and the second water collection tank 23. The first water collection tank 22 has a first water inlet 221, and the second water collection tank 23 has a first water outlet 231. Each heating circulation pipe 24 includes a pipe body 241, which has a fourth water inlet 241 for receiving water flow. 1. A third outlet 2412 capable of discharging water is provided. A continuous water passage 2413 is formed inside the pipe body 241, extending from the fourth inlet 2411 to the third outlet 2412. The pipe body 241 has multiple bends 2414. Multiple spray pipes 25 are also connected inside the heating box 21. A fourth outlet 214 is provided at the bottom of the heating box 21. A water pump 26 is connected between the fourth outlet 214 and the inlet of the spray pipe 25. Cold water in water tank 41 is transported to the first inlet 221 by water pump 43, and then enters the first collection tank 22 from the first inlet 221. The water is then transferred to the second collection tank 23 through multiple parallel heating circulation pipes 24. Exhaust gas heats the cold water in the heating circulation pipes 24. The water in the second collection tank 23 then flows back to the water tank 41 through the pipe connecting the first outlet 231 and the water tank 41. Through continuous water circulation, the water is gradually heated. Furthermore, a continuous water channel 2413 is formed within the pipe body 241, extending from the fourth inlet 2411 to the third outlet 2412, which prolongs the water flow and allows for greater contact with the exhaust gas outside the pipe, improving heating efficiency. Spray pipes 25 periodically or as needed spray clean the outer surface of the heating circulation pipes 24, the inner wall of the heating tank 21, and other components, effectively removing accumulated smoke, tar, and other pollutants to prevent them from affecting heat exchange efficiency.

[0036] The water tank 41 has a second inlet 411 and a second outlet 412. The second inlet 411 of the water tank 41 is connected to the first outlet 231 of the second water collection tank 23 via a pipe. The inlet of the water distribution tank 42 is connected to the second outlet 412 of the water tank 41, and the outlet of the water distribution tank 42 is connected to an external pipe. The water tank 41 is also provided with a third inlet 413 connected to an external cold water pipe. Because the cleaning workpieces are in different positions, the water is distributed through the water distribution tank 42, so that the hot water is fully utilized.

[0037] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A waste heat recovery device for curing oven exhaust gas, characterized in that, include: The flue gas purification system (1), heating system (2), secondary filtration system (3) and water circulation system (4) are connected in sequence. The heating system (2) includes a heating box (21), a heating space (211) is provided inside the heating box (21), a ventilation inlet (212) is provided on the top of the heating box (21), the ventilation inlet (212) is connected to the flue gas purification system (1), a water storage component is also provided inside the heating box (21), and an exhaust pipe (213) is also provided on the side of the heating box (21). The secondary filtration system (3) includes a filter tower (31) with an internal accommodating space (311). The top of the filter tower (31) is provided with a first air outlet (312), and a first air inlet (313) is provided on one side of the filter tower (31). The first air inlet (313) is connected to the exhaust pipe (213). The filter tower (31) is provided with a suction pump that can draw gas from the heating space (211) into the filter tower (31). The side wall of the filter tower (31) is also connected to a plurality of filter elements (32) that can be inserted into the accommodating space (311). The plurality of filter elements (32) are arranged in an array. The water circulation system (4) includes a water tank (41) and multiple water distribution tanks (42) connected to the water tank (41). The water tank (41) is connected to a water pump (43) that can transport the water in the water tank (41) to the water storage component. The filter tower (31) is also provided with an installation plate (33), which divides the accommodating space (311) into an air inlet chamber (3111) communicating with the first air inlet (313) and an exhaust chamber (3112) communicating with the first air outlet (312). An installation cylinder (34) is provided between the installation plate (33) and the side of the filter tower (31). The installation cylinder (34) has a plurality of first through holes (341) on the side near the side of the filter tower (31). The filter element (32) is rotatably connected between the installation cylinder (34) and the filter tower (31). The filter element (32) includes an inner cylinder (321) rotatably connected to the mounting cylinder (34). A guide plate (322) is provided inside the inner cylinder (321). The guide plate (322) includes a hollow sleeve portion (3221) and two connecting portions (3222) extending from the sleeve portion (3221) to the inner wall of the inner cylinder (321). The two connecting portions (3222) and the sleeve portion (3221) can cooperate to hold the inner cylinder. (321) A first channel (3211) and a second channel (3212) are separated by left and right intervals. The sleeve part (3221) is provided with a third channel (3223), a second air inlet (3224), and a second air outlet (3225). The second air inlet (3224) is located on the side of the sleeve part (3221) near the mounting plate (33), and the third channel (3223) passes through the second air inlet (3224). The second air outlet (3225) is located on the sleeve part (3221) near the side wall of the filter tower (31) and connected to the second channel (3212). The third channel (3223) is connected to the first channel (3211) through the second air outlet (3225). The inner cylinder (321) is also provided with a second through hole (3213) corresponding to the position of a plurality of first through holes (341). The plurality of second through holes (3213) can be connected to the first channel (3211) and the second channel (3212) respectively. The first channel (3211), the second channel (3212) and the third channel (3223) are all provided with filter elements (35). The top of the mounting cylinder (34) is provided with at least two third air outlets (342). The top of the inner cylinder (321) and located on the side of the first channel (3211) is provided with a fourth air outlet (3214).

2. The waste heat recovery device for curing oven exhaust gas according to claim 1, characterized in that, The inner cylinder (321) has a groove (3215) on its top, and the mounting cylinder (34) has a protruding post (343) on its top. A first bearing (36) is connected to the post (343). The outside of the first bearing (36) is connected to the groove (3215). The bottom of the inner cylinder (321) is also connected to a protruding connecting shaft (323). The connecting shaft (323) is connected to a mounting base (324). A second bearing (325) is provided between the mounting base (324) and the connecting shaft (323). The mounting base (324) is connected to the filter tower (31).

3. The waste heat recovery device for curing oven exhaust gas according to claim 2, characterized in that, The end of the connecting shaft (323) is provided with a rotating wheel (51), and a drive motor (52) is provided on one side of the filter tower (31). A drive wheel (53) is connected to the output shaft of the drive motor (52), and a transmission belt is provided between the drive wheel (53) and the rotating wheel (51) in the same row.

4. The waste heat recovery device for curing oven exhaust gas according to claim 2, characterized in that, The mounting plate (33) is provided with a plurality of first bends (331) that can form steps. The filter tower (31) is provided with a plurality of second bends (314) on the plate surface corresponding to the position of the mounting plate (33). The second bends (314) and the first bends (331) are arranged alternately in the upper and lower positions so that the filter element (32) is inclined.

5. The waste heat recovery device for curing oven exhaust gas according to claim 1, characterized in that, The flue gas purification system (1) includes an installation box (11) and a channel pipe (12) connected to the top of the installation box (11). The installation box (11) is hollow and has multiple filter plates (13). The installation box (11) has an opening slot (111) that allows gas to enter. The filter plate (13) includes an outer frame (131) composed of multiple connecting plates (1311). An installation slot (132) is formed in the outer frame (131). Multiple partition plates (133) that can divide the installation slot (132) into multiple ventilation channels (1321) are arranged at intervals in the installation slot (132). Filter plate bodies (134) are arranged between the two sides of the partition plates (133) and the inner wall of the outer frame (131).

6. The waste heat recovery device for curing oven exhaust gas according to claim 5, characterized in that, Each ventilation channel (1321) is provided with a guide plate (135) with multiple bends, and the connecting plate (1311) is provided with multiple flanges (1312). The flanges (1312) are located above or below the multiple partition plates (133) so that a snap-fit ​​space (136) is formed between the flanges (1312) and the top or bottom surface of the partition plate (133) for the filter plate body (134) to snap into.

7. The waste heat recovery device for curing oven exhaust gas according to claim 1, characterized in that, The water storage assembly includes a first water collection tank (22) and a second water collection tank (23) spaced apart vertically within the heating space (211). Multiple heating circulation pipes (24) are arranged between the first water collection tank (22) and the second water collection tank (23). The first water collection tank (22) has a first water inlet (221), and the second water collection tank (23) has a first water outlet (231). Each heating circulation pipe (24) includes a pipe body (241) and has a fourth water inlet (2411) for receiving water flow. The heating box (21) has a fourth inlet (2411) and a third outlet (2412) for discharging water. A continuous water passage (2413) is formed inside the pipe body (241) extending from the fourth inlet (2411) to the third outlet (2412). The pipe body (241) has multiple bends (2414). Multiple spray pipes (25) are also connected inside the heating box (21). A fourth outlet (214) is provided at the bottom of the heating box (21). A water pump (26) is connected between the fourth outlet (214) and the inlet of the spray pipe (25).

8. The waste heat recovery device for curing oven exhaust gas according to claim 7, characterized in that, The water tank (41) has a second inlet (411) and a second outlet (412). The second inlet (411) of the water tank (41) is connected to the first outlet (231) of the second collection tank (23) by a pipe. The inlet of the water distribution tank (42) is connected to the second outlet (412) of the water tank (41), and the outlet of the water distribution tank (42) is connected to an external pipe. The water tank (41) is also provided with a third inlet (413) connected to an external cold water pipe.

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