Setting machine waste heat recovery device convenient to clean

Abstract

The utility model relates to the technical field of waste gas treatment, and discloses a setting machine waste heat recovery device convenient to clean, which comprises a first heat exchange channel and a second heat exchange channel, and a first air cavity, a first heat exchange cavity and a second air cavity are sequentially arranged in the first heat exchange channel from front to back; a plurality of first air heat exchange tubes in a rectangular array are arranged in the first heat exchange cavity and are communicated with the first air cavity and the second air cavity; a second waste gas cavity, a third air cavity, a second heat exchange cavity, a fourth air cavity and a third waste gas cavity are formed in the second heat exchange channel, and a plurality of second air heat exchange pipes in a rectangular array are arranged in the second heat exchange channel and communicate with the third air cavity and the fourth air cavity. According to the finned tube heat exchanger, the air heat exchange tubes penetrate through the heat exchange channels in parallel, the heat exchange effect can be effectively guaranteed through parallel convection arrangement of the air flow direction and the waste gas flow direction, large intervals are reserved between the air heat exchange tubes, later cleaning work is facilitated, and the problem that an existing finned tube heat exchanger is inconvenient to clean is solved.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and in particular to a waste heat recovery device for a stenter that is easy to clean. Background Technology

[0002] Currently, stenters generate a large amount of high-heat waste gas during processing. Directly releasing this waste gas into the atmosphere can easily pollute the surrounding environment. Furthermore, heat loss during emission leads to resource waste and significantly reduces the efficiency of the equipment. To improve energy utilization, the heat in the waste gas from stenters is typically recovered through waste heat recovery devices. Existing waste heat recovery devices, such as the waste heat exchange device for textile stenters disclosed in patent announcement number CN 101749976 B, include finned heat pipes. Multiple finned heat pipes are arranged vertically, with their upper and lower ends connected to horizontally arranged header connecting pipes to form rectangular heat transfer rows. Multiple rows of heat transfer rows are arranged in parallel, with the upper and lower left and right sides respectively connected by two longitudinally arranged upper and lower header connecting pipes to each row, forming a rectangular heat transfer body. The outer side of the rectangular heat transfer body is a closed shell. However, since the exhaust gas from the stenter contains a lot of oil and lint, after a period of use, the oil and lint tend to accumulate on the finned tubes. However, the finned tubes are arranged in a relatively concentrated manner and cannot be disassembled, making cleaning difficult. Utility Model Content

[0003] The purpose of this invention is to provide a waste heat recovery device for a stenter that is easy to clean. By having air heat exchange tubes pass through the heat exchange channel in parallel and by setting the air flow direction and the waste flow direction in parallel convection, the heat exchange effect can be effectively guaranteed. In addition, there is a large gap between the air heat exchange tubes, which facilitates the subsequent cleaning work and solves the problem of the inconvenience of cleaning existing finned tube heat exchangers.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A heat recovery device for a stenter that is easy to clean includes a first heat exchange channel and a second heat exchange channel arranged at the front and rear. The front end of the first heat exchange channel is connected to an air inlet shell. The first heat exchange channel contains, from front to back, a first air cavity, a first heat exchange cavity, a second air cavity, and a first exhaust gas cavity, which are not interconnected. Multiple linearly distributed first exhaust gas pipes connecting the air inlet shell and the first heat exchange cavity are fixed at the front end of the first heat exchange channel. Multiple rectangular arrays of first air heat exchange pipes are fixed inside the first heat exchange cavity, with both ends of each pipe extending into the first air cavity and the second air cavity, respectively. Multiple linearly distributed second exhaust gas pipes connecting the first heat exchange cavity and the first exhaust gas cavity are fixed at the rear end of the first heat exchange channel. An air outlet shell communicating with the first air cavity is fixed at the front end of the first heat exchange channel.

[0006] The second heat exchange channel is provided with, from front to back, a second non-communicating waste gas chamber, a third air chamber, a second heat exchange chamber, a fourth air chamber, and a third waste gas chamber. The second waste gas chamber is connected to the first waste gas chamber via a waste gas connecting pipe. At the front end of the second heat exchange channel, multiple linearly distributed third waste gas pipes connecting the second waste gas chamber and the second heat exchange chamber are fixed. Inside the second heat exchange chamber, multiple rectangular arrays of second air heat exchange pipes are fixed, with both ends of the second air heat exchange pipes extending into the third and fourth air chambers, respectively. The third air chamber is connected to the second air chamber via an air connecting pipe. At the rear end of the second heat exchange channel, multiple linearly distributed fourth waste gas pipes connecting the second heat exchange chamber and the third waste gas chamber are fixed. At the rear end of the second heat exchange channel, an air inlet housing communicating with the fourth air chamber and a waste gas outlet pipe communicating with the third waste gas chamber are also fixed. A blower is fixedly connected to the air inlet housing.

[0007] The high-temperature exhaust gas generated by the stenter is distributed as follows: It enters the inlet housing, then flows through the first exhaust pipe into the first heat exchange channel. Within the first heat exchange channel, it flows backward to the second exhaust pipe and enters the first exhaust chamber through the second exhaust pipe. It then enters the second exhaust chamber through the exhaust connecting pipe into the large second heat exchange channel. The exhaust gas in the second exhaust chamber enters the second heat exchange channel through the third exhaust pipe, then enters the third exhaust chamber through the fourth exhaust pipe, and finally exits through the exhaust outlet pipe. The main heat of the high-temperature exhaust gas is dissipated within the first and second heat exchange channels.

[0008] Fresh air flow: The blower delivers fresh air into the air intake housing, then into the fourth air chamber. The air in the fourth air chamber is transported to the third air chamber through the second air heat exchange pipe. Since the second air heat exchange pipe is located in the second heat exchange chamber, the heat generated by the exhaust gas in the second heat exchange chamber heats the air passing through the second air heat exchange pipe. Then, the air in the third air chamber enters the second air chamber through the air connection pipe, and then enters the first air chamber through the first air heat exchange pipe. The heat in the first heat exchange channel further heats the air flowing through the first air heat exchange pipe. Finally, the high-temperature air in the first air chamber flows out through the air outlet housing.

[0009] Meanwhile, a rectangular array of first air heat exchange tubes is set in the first heat exchange channel, and a rectangular array of second air heat exchange tubes is set in the second heat exchange channel. A large gap is left between two adjacent first heat exchange tubes or second heat exchange tubes to facilitate subsequent cleaning work.

[0010] The present invention is further configured such that: the first exhaust pipe passes through the first air cavity longitudinally, the second exhaust pipe passes through the second air cavity longitudinally; the third exhaust pipe passes through the third air cavity longitudinally, and the fourth exhaust pipe passes through the fourth air cavity longitudinally.

[0011] Through the above technical solution, the first exhaust pipe passes through the first air cavity, which can retain some heat in the first air cavity. The second exhaust pipe passes through the second air cavity, which can retain some heat in the second air cavity. Similarly, the third exhaust pipe passes through the third air cavity, and the fourth exhaust pipe passes through the fourth exhaust cavity, which also retain some heat in the third and fourth air cavities. The heat in the four air cavities can further heat the air flowing through the four air cavities, thereby further improving heat recovery.

[0012] The present invention is further configured such that: the upper sidewalls of the first heat exchange channel and the second heat exchange channel are provided with a plurality of linearly evenly distributed stepped rectangular through holes, each stepped rectangular through hole is provided with a cover plate that cooperates with it, one end of the cover plate is fixed with a rotating shaft, the rotating shaft is rotatably connected to the sidewall of the stepped rectangular through hole; an L-shaped rod is fixed to the end of the cover plate near the rotating shaft, a support rod is rotatably connected to the L-shaped rod, the support rod is provided with a sleeve seat that cooperates with it, and the sleeve seat is fixed on the first heat exchange channel or the second heat exchange channel.

[0013] The above technical solution allows for easy cleaning of the air heat exchange tubes in the heat exchange channel by installing a cover plate on the heat exchange channel. The cover plate can be supported by inserting an L-shaped rod into the sleeve seat, which further facilitates the cleaning process.

[0014] This utility model is further configured such that: a medicine branch pipe is provided below each stepped rectangular through hole, and multiple medicine nozzles are fixed on the medicine branch pipes, with the medicine nozzles tilted downwards; the outer ends of the multiple medicine branch pipes are connected to the main medicine pipe. The main medicine pipe is equipped with a first flow meter and a first solenoid valve, and the first flow meter and the first solenoid valve are electrically connected to a controller.

[0015] Below each rectangular through-hole of the step, there are two parallel water spray branch pipes. Multiple pairs of spray heads are fixed on the water spray branch pipes. Each pair of spray heads is arranged in an inverted V shape and inserted between two adjacent first air heat exchange pipes or two adjacent second air heat exchange pipes. The outer ends of the multiple water spray branch pipes are connected to the main water spray pipe. The main water spray pipe is equipped with a second flow meter and a second solenoid valve. The second flow meter and the second solenoid valve are also electrically connected to the controller.

[0016] The main liquid can deliver the liquid to each branch pipe, and then spray it out through the nozzle into the first or second heat exchange channel. The liquid can neutralize the exhaust gas flowing through the first or second heat exchange channel, absorbing and reacting the toxic gases contained in the exhaust gas. The first solenoid valve can control whether the liquid enters or not.

[0017] When cleaning is required, the main water spray pipe delivers water to each branch water spray pipe. The water in the branch water spray pipe is then sprayed through the spray nozzles between two adjacent first air heat exchange tubes or between two adjacent second air heat exchange tubes, thereby rinsing the outer walls of the first and second air heat exchange tubes and facilitating subsequent cleaning work.

[0018] The present invention is further configured such that: a temperature sensor is provided in the first heat exchange channel and the second heat exchange channel, and the temperature sensor is electrically connected to the controller.

[0019] Temperature sensors can monitor the temperature inside the heat exchange channel. If the temperature suddenly rises, it may be due to the combustion of exhaust gas inside the heat exchange channel. In this case, the temperature sensor transmits a signal to the controller, which controls the second solenoid valve to deliver water to the water spray branch pipe, thereby spraying water into the first and second heat exchange channels to extinguish the fire.

[0020] The present invention is further configured such that: the bottom of the first heat exchange channel and the second heat exchange channel are each connected to a plurality of sewage branch pipes, and the plurality of sewage branch pipes are connected to the main sewage pipe.

[0021] With the above technical solution, the waste liquid generated after the sprayed medicine and exhaust gas are neutralized, as well as the wastewater generated after the cleaning work, can enter the main sewage pipe through multiple sewage branch pipes and then flow out through the main sewage pipe.

[0022] The outstanding effect of this utility model is:

[0023] Compared with existing technologies, the parallel arrangement of air heat exchange tubes through the heat exchange channel and the parallel convection of air and waste air flow can effectively ensure the heat exchange effect. In addition, the large gap between the air heat exchange tubes facilitates subsequent cleaning and solves the problem of inconvenient cleaning of existing finned tube heat exchangers.

[0024] By setting up several water spray heads, the outer wall of the heat exchange tube in the heat exchange chamber can be sprayed and washed in a timely manner to prevent scale buildup on the outer wall of the heat exchange tube from affecting the heat exchange effect.

[0025] Temperature sensors can monitor in real time whether there is an open flame in the heat exchange channel, and water spray heads can extinguish the fire in a timely manner. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a top view of the present invention;

[0028] Figure 3 for Figure 2 A sectional view of AA;

[0029] Figure 4 for Figure 1 A magnified view of a portion of B;

[0030] Figure 5 for Figure 3 Sectional view of CC.

[0031] Reference numerals: 10, First heat exchange channel; 11, First exhaust pipe; 12, First air heat exchange pipe; 13, Second exhaust pipe; 14, Air outlet shell;

[0032] 101. First air chamber; 102. First heat exchange chamber; 103. Second air chamber; 104. First waste gas chamber;

[0033] 20. Second heat exchange channel; 21. Exhaust gas connection pipe; 22. Third exhaust gas pipe; 23. Second air heat exchange pipe; 24. Air connection pipe; 25. Fourth exhaust gas pipe; 26. Air inlet shell; 27. Exhaust gas outlet pipe;

[0034] 201. Second exhaust gas chamber; 202. Third air chamber; 203. Second heat exchange chamber; 204. Fourth air chamber; 205. Third exhaust gas chamber;

[0035] 30. Intake casing;

[0036] 40. Exhaust gas connection pipe;

[0037] 50. Cover plate; 51. L-shaped rod; 52. Support rod; 53. Sleeve seat;

[0038] 60. Branch pipe for liquid medicine; 61. Spray nozzle for liquid medicine; 62. Main pipe for liquid medicine;

[0039] 70. Sprinkler branch pipe; 71. Sprinkler head; 72. Sprinkler main pipe. Detailed Implementation

[0040] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0041] The following is for reference Figures 1 to 5 The present invention will be described as follows:

[0042] A heat recovery device for a stenter that is easy to clean includes a first heat exchange channel 10 and a second heat exchange channel 20 arranged front and rear. The front end of the first heat exchange channel 10 is connected to an air inlet shell 30. The first heat exchange channel 10 has a first air cavity 101, a first heat exchange cavity 102, a second air cavity 103 and a first exhaust gas cavity 104 arranged sequentially from front to back, and they are not interconnected. The front end of the first heat exchange channel 10 is fixed with a plurality of linearly evenly distributed first exhaust gas pipes 11 that connect the air inlet shell 30 and the first heat exchange cavity 102. The first heat exchange cavity 102 is fixed with a plurality of rectangular arrays of first air heat exchange pipes 12, and the two ends of the first air heat exchange pipes 12 extend into the first air cavity 101 and the second air cavity 103, respectively. The rear end of the first heat exchange channel 10 is fixed with a plurality of linearly evenly distributed second exhaust gas pipes 13 that connect the first heat exchange cavity 102 and the first exhaust gas cavity 104. The front end of the first heat exchange channel 10 is fixed with an air outlet shell 14 that communicates with the first air cavity 101.

[0043] The second heat exchange channel 20 contains, from front to back, a second exhaust gas chamber 201, a third air chamber 202, a second heat exchange chamber 203, a fourth air chamber 204, and a third exhaust gas chamber 205, which are not interconnected. The second exhaust gas chamber 201 is connected to the first exhaust gas chamber 104 via an exhaust gas connecting pipe 21. Multiple linearly distributed third exhaust gas pipes 22 are fixed at the front end of the second heat exchange channel 20, connecting the second exhaust gas chamber 201 and the second heat exchange chamber 203. Multiple rectangular arrays of second air heat exchange pipes 23 are fixed within the second heat exchange chamber 203. The two ends of 3 extend into the third air cavity 202 and the fourth air cavity 204 respectively; the third air cavity 202 is connected to the second air cavity 103 through the air connecting pipe 24; the rear end of the second heat exchange channel 20 is fixed with multiple linearly evenly distributed fourth exhaust pipes 25 that connect the second heat exchange cavity 203 and the third exhaust gas cavity 205; the rear end of the second heat exchange channel 20 is also fixed with an air inlet housing 26 that communicates with the fourth air cavity 204 and an exhaust gas outlet pipe 27 that communicates with the third exhaust gas cavity 205; the air inlet housing 26 is fixedly connected with a blower 40.

[0044] The flow path of the high-temperature exhaust gas generated by the stenter: The high-temperature exhaust gas enters from the inlet shell, then enters the first heat exchange channel through the first exhaust pipe, then flows backward to the second exhaust pipe in the first heat exchange channel, and enters the first exhaust chamber through the second exhaust pipe, then enters the second exhaust chamber of the large second heat exchange channel through the exhaust connecting pipe, the exhaust gas in the second exhaust chamber enters the second heat exchange channel through the third exhaust pipe, then enters the third exhaust chamber through the fourth exhaust pipe, and finally exits from the exhaust outlet pipe; the main heat of the high-temperature exhaust gas is dissipated in the first and second heat exchange channels;

[0045] Fresh air flow: The blower delivers fresh air into the air intake housing, then into the fourth air chamber. The air in the fourth air chamber is transported to the third air chamber through the second air heat exchange pipe. Since the second air heat exchange pipe is located in the second heat exchange chamber, the heat generated by the exhaust gas in the second heat exchange chamber heats the air passing through the second air heat exchange pipe. Then, the air in the third air chamber enters the second air chamber through the air connection pipe, and then enters the first air chamber through the first air heat exchange pipe. The heat in the first heat exchange channel further heats the air flowing through the first air heat exchange pipe. Finally, the high-temperature air in the first air chamber flows out through the air outlet housing.

[0046] Meanwhile, a rectangular array of first air heat exchange tubes is set in the first heat exchange channel, and a rectangular array of second air heat exchange tubes is set in the second heat exchange channel. A large gap is left between two adjacent first heat exchange tubes or second heat exchange tubes to facilitate subsequent cleaning work.

[0047] The first exhaust pipe 11 passes longitudinally through the first air cavity 101, the second exhaust pipe 13 passes longitudinally through the second air cavity 103; the third exhaust pipe 22 passes longitudinally through the third air cavity 202, and the fourth exhaust pipe 25 passes longitudinally through the fourth air cavity 204.

[0048] The first exhaust pipe passes through the first air chamber, leaving some heat inside. The second exhaust pipe passes through the second air chamber, leaving some heat inside. Similarly, the third exhaust pipe passes through the third air chamber, and the fourth exhaust pipe passes through the fourth air chamber, leaving some heat inside the third and fourth air chambers. The heat in the four air chambers can further heat the air flowing through them, thereby further improving heat recovery.

[0049] The upper sidewalls of the first heat exchange channel 10 and the second heat exchange channel 20 are each provided with a plurality of linearly distributed stepped rectangular through holes 1020. Each stepped rectangular through hole 1020 is provided with a cover plate 50 that cooperates with it. One end of the cover plate 50 is fixed with a rotating shaft, which is rotatably connected to the sidewall of the stepped rectangular through hole. An L-shaped rod 51 is fixed to the end of the cover plate 50 near the rotating shaft. A support rod 52 is rotatably connected to the L-shaped rod 51. The support rod 52 is provided with a sleeve seat 53 that cooperates with it. The sleeve seat 53 is fixed on the first heat exchange channel 10 or the second heat exchange channel 20.

[0050] By installing a cover plate on the heat exchange channel, the air heat exchange tubes inside the heat exchange channel can be easily cleaned later. The cover plate can be supported by inserting an L-shaped rod into the sleeve seat, which further facilitates the cleaning work.

[0051] Below each stepped rectangular through-hole 1020, there is a medicine branch pipe 60, and multiple medicine nozzles 61 are fixed on the medicine branch pipe 60. The medicine nozzles 61 are set at an angle downward. The outer ends of the multiple medicine branch pipes 60 are connected to the main medicine pipe 62. The main medicine pipe 62 is equipped with a first flow meter and a first solenoid valve, and the first flow meter and the first solenoid valve are electrically connected to a controller.

[0052] Below each stepped rectangular through-hole 1020, there are two parallel water spray branch pipes 70. Multiple pairs of water spray heads 71 ​​are fixed on the water spray branch pipes 70. Each pair of water spray heads 71 ​​is arranged in an inverted V shape and inserted between two adjacent first air heat exchange pipes 12 or two adjacent second air heat exchange pipes 23. The outer ends of the multiple water spray branch pipes 70 are connected to the main water spray pipe 72. The main water spray pipe is equipped with a second flow meter and a second solenoid valve, which are also electrically connected to the controller.

[0053] The main liquid can deliver the liquid to each branch pipe, and then spray it out through the nozzle into the first or second heat exchange channel. The liquid can neutralize the exhaust gas flowing through the first or second heat exchange channel, absorbing and reacting the toxic gases contained in the exhaust gas. The first solenoid valve can control whether the liquid enters or not.

[0054] When cleaning is required, the main water spray pipe delivers water to each branch water spray pipe. The water in the branch water spray pipe is then sprayed through the spray nozzles between two adjacent first air heat exchange pipes 12 or between two adjacent second air heat exchange pipes 23, thereby rinsing the outer walls of the first and second air heat exchange pipes and facilitating subsequent cleaning work.

[0055] Temperature sensors 73 are provided in the first heat exchange channel 10 and the second heat exchange channel 20, and the temperature sensors are electrically connected to the controller.

[0056] Temperature sensors can monitor the temperature inside the heat exchange channel. If the temperature suddenly rises, it may be due to the combustion of exhaust gas inside the heat exchange channel. In this case, the temperature sensor transmits a signal to the controller, which controls the second solenoid valve to deliver water to the water spray branch pipe, thereby spraying water into the first and second heat exchange channels to extinguish the fire.

[0057] The bottom of the first heat exchange channel 10 and the second heat exchange channel 20 are each connected to a plurality of drain branch pipes 74, and the plurality of drain branch pipes 74 are connected to the drain main pipe 75.

[0058] The waste liquid generated after the sprayed medicine and exhaust gas are neutralized, as well as the wastewater generated after the cleaning work, can enter the main sewage pipe through multiple sewage branch pipes and then flow out through the main sewage pipe.

[0059] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A heat recovery device for a stenter machine that is easy to clean, comprising a first heat exchange channel (10) and a second heat exchange channel (20) arranged at the front and rear, wherein an air inlet shell (30) is connected to the front end of the first heat exchange channel (10); characterized in that: The first heat exchange channel (10) is provided with a first air cavity (101), a first heat exchange cavity (102), a second air cavity (103), and a first exhaust gas cavity (104) arranged sequentially from front to back. The front end of the first heat exchange channel (10) is fixed with a plurality of linearly evenly distributed first exhaust gas pipes (11) connecting the air inlet shell (30) and the first heat exchange cavity (102). The first heat exchange cavity (102) is fixed with a plurality of rectangular array first air heat exchange pipes (12), the two ends of which extend into the first air cavity (101) and the second air cavity (103) respectively. The rear end of the first heat exchange channel (10) is fixed with a plurality of linearly evenly distributed second exhaust gas pipes (13) connecting the first heat exchange cavity (102) and the first exhaust gas cavity (104). The front end of the first heat exchange channel (10) is fixed with an air outlet shell (14) communicating with the first air cavity (101). The second heat exchange channel (20) is provided with a second exhaust gas chamber (201), a third air chamber (202), a second heat exchange chamber (203), a fourth air chamber (204), and a third exhaust gas chamber (205) arranged sequentially from front to back. The second exhaust gas chamber (201) is connected to the first exhaust gas chamber (104) through an exhaust gas connecting pipe (21). At the front end of the second heat exchange channel (20), there are multiple linearly distributed third exhaust gas pipes (22) connecting the second exhaust gas chamber (201) and the second heat exchange chamber (203). In the second heat exchange chamber (203), there are multiple rectangular arrays of second air heat exchange pipes (23). The two ends of the second heat exchange channel (20) extend into the third air chamber (202) and the fourth air chamber (204) respectively; the third air chamber (202) is connected to the second air chamber (103) through the air connecting pipe (24); the rear end of the second heat exchange channel (20) is fixed with multiple linearly distributed fourth exhaust pipes (25) connecting the second heat exchange chamber (203) and the third exhaust chamber (205); the rear end of the second heat exchange channel (20) is also fixed with an air inlet shell (26) communicating with the fourth air chamber (204) and an exhaust outlet pipe (27) communicating with the third exhaust chamber (205); the air inlet shell (26) is fixedly connected with a blower (40).

2. The waste heat recovery device for a convenient-to-clean stenter as described in claim 1, characterized in that: The first exhaust pipe (11) passes through the first air cavity (101) longitudinally, the second exhaust pipe (13) passes through the second air cavity (103) longitudinally, the third exhaust pipe (22) passes through the third air cavity (202) longitudinally, and the fourth exhaust pipe (25) passes through the fourth air cavity (204) longitudinally.

3. The waste heat recovery device for a convenient-to-clean stenter as described in claim 1, characterized in that: The upper sidewalls of the first heat exchange channel (10) and the second heat exchange channel (20) are provided with a plurality of linearly distributed stepped rectangular through holes (1020). Each stepped rectangular through hole (1020) is provided with a cover plate (50) that cooperates with it. One end of the cover plate (50) is fixed with a rotating shaft, which is rotatably connected to the sidewall of the stepped rectangular through hole. An L-shaped rod (51) is fixed to one end of the cover plate (50) near the rotating shaft. A support rod (52) is rotatably connected to the L-shaped rod (51). The support rod (52) is provided with a sleeve seat (53) that cooperates with it. The sleeve seat (53) is fixed on the first heat exchange channel (10) or the second heat exchange channel (20).

4. The waste heat recovery device for a stenter machine that is easy to clean according to claim 3, characterized in that: Below each stepped rectangular through hole (1020) is a medicine branch pipe (60), and multiple medicine nozzles (61) are fixed on the medicine branch pipe (60). The medicine nozzles (61) are set at an angle downwards; the outer ends of the multiple medicine branch pipes (60) are connected to the main medicine pipe (62). Below each stepped rectangular through hole (1020) are two parallel water spray branch pipes (70), and multiple pairs of water spray heads (71) are fixed on the water spray branch pipes (70). Each pair of water spray heads (71) is arranged in an inverted V shape and inserted between two adjacent first air heat exchange pipes (12) or between two adjacent second air heat exchange pipes (23). The outer ends of the multiple water spray branch pipes (70) are connected to the main water spray pipe (72).

5. A waste heat recovery device for a stenter machine that is easy to clean, as described in claim 4, characterized in that: Temperature sensors (73) are provided in the first heat exchange channel (10) and the second heat exchange channel (20).

6. The waste heat recovery device for a stenter machine that is easy to clean according to claim 4, characterized in that: The bottom of the first heat exchange channel (10) and the second heat exchange channel (20) are each connected to a plurality of drain branch pipes (74), and the plurality of drain branch pipes (74) are connected to the drain main pipe (75).

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