Line surface treatment process and surface treatment equipment thereof

Abstract

The invention discloses a line surface treatment process and surface treatment equipment thereof. The line surface treatment process comprises the following steps: S1, a shower coating treatment stage; s2, a segmented heating stage; s3, a gas treatment stage; and S4, a solvent recovery stage. According to the line surface treatment process and the line surface treatment equipment, the inclination angle of a line is finely adjusted through the height adjusting roller, so that the line is prevented from being heated and stretched at the same time, the phenomena that the line is stretched and a coating is stretched and cracked are avoided, then the device adopts a segmented heating mode for drying, namely, the set temperature of a first-section drying oven is 40-60 DEG C, and the set temperature of a second-section drying oven is 40-60 DEG C; the first section of drying oven is provided with an air flotation device, the front end and the rear end of the drying oven are provided with partition plates with slits, the second section of drying oven is provided with an air flotation device, the rear end of the drying oven is provided with a partition plate with small holes, the third section of drying oven is provided with an air flotation device, the rear end of the drying oven is provided with a partition plate with small holes, and the temperature of the fourth section of drying oven is set to be 120-150 DEG C; a partition plate with small holes is arranged at the rear end, so that heat cross temperature jump between the drying ovens is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of line processing, in particular to a line surface treatment process and a surface treatment device thereof. Background Art

[0002] When the line surface is treated, it needs to be coated on the surface. The coating contains solvent. The processing steps include multi-stage heating, preheating, solvent volatilization and coating curing. After searching, it is found that the surface treatment process of the line in the prior art is typically as follows: a wire drying machine, belonging to the field of drying technology, a first wire inlet is provided on the top of the drying barrel, and a first wire outlet is provided on the bottom of the drying barrel; a heating element is arranged in the drying barrel for drying the wire; a first wire inlet drive assembly is arranged on the top of the drying barrel, and the wire can be deformed into an arc structure after passing through the first wire inlet drive assembly; a painting piece is arranged on the top of the drying barrel, and a cavity is provided in the painting piece, and the cavity is suitable for filling with paint liquid. A through hole connected to the cavity and for the wire to pass through is provided on the painting piece, and the height of the painting piece is lower than the height of the first wire inlet drive assembly, so that the wire deformed into an arc structure can be in a spiral structure after passing through the through hole and entering the drying barrel through the first wire inlet; the first wire outlet drive assembly is installed below the drying barrel to output the wire through the first wire outlet. Its main feature is that it is helpful to save the floor space of the dryer and improve the drying efficiency.

[0003] Traditional ovens use metal rollers to support the substrate. In the present invention, the circumferential surface of the line needs to be coated, and the coating cannot contact the metal roller before it is cured. There are large gaps between the partitions of each temperature zone in the ordinary oven, which will cause heat to cross-heat between the ovens, which is easy to cause the temperature in the low-temperature zone to be too high. When the coating thickness is thick, the high temperature in the low-temperature zone will cause uneven solvent volatilization, local bubbling and other phenomena, resulting in uniform coating and unstable performance. In some ovens used for line processing, small holes are used instead of gaps at the partitions to effectively block heat from flowing. However, for lines that need to be coated, if a perforated partition is used and a large tension is applied at both ends to keep the lines straight, such a design has certain theoretical feasibility, but it has limitations in practical application. For example, when the coating is hard, the lines will be stretched while being heated, which will cause the lines to be elongated, the diameter to become thinner, and the coating to be pulled and cracked.

[0004] In summary, the tension of the existing processing device line cannot be adjusted, and the heat between the ovens crosses and rises, which easily causes the temperature in the low-temperature zone to be too high. When the coating thickness is thick, the high temperature in the low-temperature zone will cause uneven solvent volatilization and local bubbling. In view of the above problems, the existing equipment needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a line surface treatment process and surface treatment equipment thereof, so as to solve the problems that the tension of the existing processing device line proposed in the above background technology cannot be adjusted, and the heat between the ovens crosses and rises in temperature, which easily causes the temperature in the low temperature zone to be too high. When the coating thickness is thick, the high temperature in the low temperature zone will cause uneven solvent volatilization and local bubbling.

[0006] To achieve the above object, the present invention provides the following technical solution: a line surface treatment process, comprising the following steps:

[0007] S1, curtain coating stage: the lines are curtain coated through the inclined drying tunnel, and there are tension adjustment rollers and height adjustment rollers in front of the curtain coating position. The tension of the lines is adjusted by the tension adjustment roller, and the inclination angle of the lines is fine-tuned by the height adjustment roller. The excess coating will drip from the bottom of the height adjustment roller.

[0008] S2, segmented heating stage: the lines after the coating treatment enter the first oven, the second oven, the third oven, the fourth oven and the fifth oven in turn for segmented heating and drying;

[0009] S3, gas treatment stage: the gases generated during the drying process of the first oven, the second oven, the third oven, the fourth oven and the fifth oven are classified and treated and then circulated and discharged into the corresponding ovens after treatment;

[0010] S4, solvent recovery stage: the solvent is recovered through the solvent collection tank, the solvent collection tank is connected to the flow meter, the flow valve and then the batching tank, the batching tank has a viscometer, and the resin tank and the auxiliary material tank are connected to the flow meter, the flow valve and then the batching tank, the resin and the auxiliary material are automatically controlled according to the set ratio, the viscometer automatically tests the viscosity change, and automatically controls the solvent flow valve to keep the viscosity within the set range.

[0011] Preferably, the S1 flow coating treatment stage starts from the flow coating position and is inclined upward at an angle of 15-30°, and there is a leveling distance from the flow coating to the low temperature section.

[0012] Preferably, in the S2 segmented heating stage, the first section of the oven is a low-temperature leveling zone, the temperature is lower than the boiling point of the solvent, the solvent is selected with a boiling point of 70-90°C, and the temperature of the first section of the oven is set at 40-60°C, and partitions with slits are used at the front and back ends. In the S2 segmented heating stage, the temperature of the second section of the oven is set near the boiling point of the solvent, set at 70-90°C, with an air flotation device, and a partition with small holes is used at the rear end.

[0013] Preferably, the temperature of the third oven is higher than the boiling point of the solvent, set at 100-120°C, to eliminate residual solvent, with an air flotation device, and a partition with small holes at the rear end. The temperature of the fourth oven is set at the curing temperature, 120-150°C, and a partition with small holes is used at the rear end. The temperature of the fifth oven is set at 60-80°C, and there are height adjustment rollers and tension adjustment pressure rollers behind the fifth oven.

[0014] Preferably, the gas discharged from the third oven in the S3 gas treatment stage has a low solvent content, and the exhaust pipe is connected to a primary solvent recovery tower. There is a coil in the tower, and the solvent-containing gas flows through the outside of the coil. The coil is usually warm air, and the solvent condenses on the outer surface of the coil and is collected and discharged from the bottom pipe of the tower. The gas treated by the primary solvent recovery tower is still at a high temperature and still contains a low concentration of gaseous solvent. This part of the gas is heated by a heater and enters the second oven.

[0015] Preferably, in the S3 gas treatment stage, the second section oven is externally connected to a secondary solvent recovery tower, which has two separated heat exchange sections. The first section is air condensation, and the solvent-containing gas flows through the coil with glass spring filler in the coil. The solvent condenses on the inner wall of the coil and is collected and discharged from the bottom; the second section is cold water condensation, the water temperature is 0-10°C, the solvent-containing gas flows through the coil with glass spring filler in the coil, the solvent condenses on the inner wall of the coil and is collected and discharged from the bottom. The gas discharged from the secondary solvent recovery tower still has a small amount of gaseous solvent, which enters the first section oven after heating.

[0016] Preferably, in the S3 gas treatment stage, the first section of the oven is externally connected to a three-stage solvent recovery tower, which has two separated heat exchange sections. The first section is water condensation, and the water condensed in the second section from the secondary solvent recovery tower, the solvent-containing gas flows through the coil, the coil has a glass spring filler, the solvent condenses on the inner wall of the coil, and is collected and discharged from the bottom. The second section is chilled water condensation, the water temperature is -10 to -5°C, the solvent-containing gas flows through the coil, the coil has a glass spring filler, the solvent condenses on the inner wall of the coil, and is collected and discharged from the bottom. The gas discharged from the tertiary solvent recovery tower is discharged after RTO incineration.

[0017] Preferably, the air flotation device of the second oven in the S2 segmented heating stage comprises a guide baffle, an air inlet is provided at the bottom of the guide baffle, and a top structure of the guide baffle is composed of three curved surfaces and two flat surfaces on one side.

[0018] Preferably, the first oven section, the second oven section, the third oven section, the fourth oven section and the fifth oven section are all provided with partitions with small holes, and the shape of the small holes is a combination of semicircles at both ends and a rectangle in the middle.

[0019] Preferably, a line surface treatment equipment is applied to the above-mentioned line surface treatment process, including a coating device and an axial flow fan. The coating device allows the solvent dropped after line coating and leveling to enter the scrubber through a control valve, and then enters the solvent collection tank after being processed in the scrubber. The axial flow fan is connected to the first section oven, the second section oven, the third section oven, the fourth section oven and the fifth section oven, and the bottoms of the first section oven, the second section oven, the third section oven and the fourth section oven are connected to the heat exchanger and the hot air blower, and the hot air blower is connected to the fifth section oven. The axial flow fans connected to the tops of the first section oven, the second section oven, the third section oven and the fourth section oven are connected to the scrubber through the heat exchanger and the second circulation pipe, and the axial flow fan at the top of the fifth section oven is connected to the hot air blower connected to the bottom of the fifth section oven through the first circulation pipe.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the line surface treatment process and the surface treatment equipment thereof,

[0021] The present invention can effectively solve the problem that the tension of the existing processing device line cannot be adjusted through the coordinated use of S1, S2, and S3 stages, and the heat between the ovens crosses and rises in temperature, which easily causes the temperature in the low-temperature zone to be high. When the coating thickness is thick, the high temperature in the low-temperature zone will lead to uneven solvent volatilization and local bubbling. The line tension is adjusted by the tension-adjusting pressure roller, and the line inclination angle is fine-tuned by the height-adjusting roller, thereby avoiding the line from being stretched while being heated, and further avoiding the line from being elongated, the diameter becoming thinner, and the coating from being pulled and cracked. Secondly, the device adopts a staged heating method for drying, that is, the temperature of the first oven is set at 40-60°C, and partitions with slits are used at the front and back ends. The temperature of the second oven is set near the boiling point of the solvent, set at 70-90℃, with an air flotation device, and a partition with small holes at the rear end. The third oven is equipped with an air flotation device, and a partition with small holes is used at the rear end. The temperature of the fourth oven is set at the curing temperature, 120-150℃, and a partition with small holes is used at the rear end to avoid heat cross-heating between the ovens. On the other hand, the guide partition used to separate the temperature of this device has a special structure, that is, its top structure is composed of 3 curved surfaces and 2 flat surfaces on one side. The oven has a partition with small holes, and the shape of the small holes is a combination of semicircles at both ends and a rectangle in the middle. The radius of the semicircles at both ends is 3a-5a, and the total length is 12a-20a, so as to further prevent temperature jumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a process flow chart of the present invention;

[0023] Figure 2 This is a schematic diagram of the drying operation in the S2 stage of the present invention;

[0024] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the oven in Section 5 of the present invention.

[0026] In the figure: 1. coating device; 2. control valve; 3. heat exchanger; 4. hot air blower; 5. first circulation pipeline; 6. second circulation pipeline; 7. axial flow fan; 8. scrubber. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-4 The present invention provides a technical solution: a line surface treatment process and a surface treatment device thereof.

[0029] Embodiment 1

[0030] A line surface treatment process comprises the following steps:

[0031] S1, curtain coating stage: the lines are curtain coated through the inclined drying tunnel, and there are tension adjustment rollers and height adjustment rollers in front of the curtain coating position. The tension of the lines is adjusted by the tension adjustment roller, and the inclination angle of the lines is fine-tuned by the height adjustment roller. The excess coating will drip from the bottom of the height adjustment roller.

[0032] S2, segmented heating stage: the lines after the coating treatment enter the first oven, the second oven, the third oven, the fourth oven and the fifth oven in turn for segmented heating and drying;

[0033] S3, gas treatment stage: the gases generated during the drying process of the first oven, the second oven, the third oven, the fourth oven and the fifth oven are classified and treated and then circulated and discharged into the corresponding ovens after treatment;

[0034] S4, solvent recovery stage: the solvent is recovered through the solvent collection tank, the solvent collection tank is connected to the flow meter, the flow valve and then the batching tank, the batching tank has a viscometer, and the resin tank and the auxiliary material tank are connected to the flow meter, the flow valve and then the batching tank, the resin and the auxiliary material are automatically controlled according to the set ratio, the viscometer automatically tests the viscosity change, and automatically controls the solvent flow valve to keep the viscosity within the set range.

[0035] In a further embodiment, the S1 flow coating treatment stage starts from the flow coating position and is tilted upward at an angle of 15-30°, and there is a leveling distance from the flow coating to the low temperature section.

[0036] In a further embodiment, the first section of the oven in the S2 segmented heating stage is a low-temperature leveling zone, the temperature of which is lower than the boiling point of the solvent, the solvent is selected to have a boiling point of 70-90°C, and the temperature of the first section of the oven is set at 40-60°C, and partitions with slits are used at the front and back ends. The temperature of the second section of the oven in the S2 segmented heating stage is set near the boiling point of the solvent, set at 70-90°C, with an air flotation device, and a partition with small holes at the rear end.

[0037] In a further embodiment, the temperature of the third oven is higher than the boiling point of the solvent, set at 100-120°C to eliminate residual solvent, and is equipped with a flotation device, and a partition with small holes is used at the rear end. The temperature of the fourth oven is set at the curing temperature, 120-150°C, and a partition with small holes is used at the rear end. The temperature of the fifth oven is set at 60-80°C, and there are height adjustment rollers and tension adjustment pressure rollers behind the fifth oven.

[0038] In a further embodiment, the gas discharged from the third oven in the S3 gas treatment stage has a low solvent content, and the exhaust pipe is connected to a primary solvent recovery tower. There is a coil in the tower, and the solvent-containing gas flows through the outside of the coil. The coil is usually warm air, and the solvent condenses on the outer surface of the coil and is collected and discharged from the bottom pipe of the tower. The gas treated by the primary solvent recovery tower is still at a high temperature and still contains a low concentration of gaseous solvent. This part of the gas is heated by a heater and enters the second oven.

[0039] In a further embodiment, the second section oven in the S3 gas processing stage is externally connected to a secondary solvent recovery tower, which has two separated heat exchange sections. The first section is air condensation, and the solvent-containing gas flows through the coil with glass spring filler in the coil. The solvent condenses on the inner wall of the coil and is collected and discharged from the bottom; the second section is cold water condensation, the water temperature is 0-10°C, the solvent-containing gas flows through the coil with glass spring filler in the coil, the solvent condenses on the inner wall of the coil and is collected and discharged from the bottom. The gas discharged from the secondary solvent recovery tower still has a small amount of gaseous solvent, which enters the first section oven after heating.

[0040] like Figure 3 and Figure 4In the further embodiment shown, the first section of the oven in the S3 gas treatment stage is externally connected to a three-stage solvent recovery tower, which has two separated heat exchange sections. The first section is water condensation, and the water condensed in the second section from the secondary solvent recovery tower, the solvent-containing gas flows through the coil, the coil has glass spring filler, the solvent condenses on the inner wall of the coil, and is collected and discharged from the bottom. The second section is chilled water condensation, the water temperature is -10 to -5°C, the solvent-containing gas flows through the coil, the coil has glass spring filler, the solvent condenses on the inner wall of the coil, and is collected and discharged from the bottom, and the gas discharged from the tertiary solvent recovery tower is discharged after RTO incineration.

[0041] like Figure 4 As shown, in a further embodiment, the air flotation device of the second oven in the S2 segmented heating stage includes a guide baffle, the bottom of the guide baffle has an air inlet, the top structure of the guide baffle is composed of 3 curved surfaces and 2 flat surfaces on one side, the first curved surface radius R1, the second curved surface radius R2, the third curved surface radius R3, the baffle spacing is a, R1 is 5a-10a, R2=R3 is 3a-4a, the second curved surface and the third curved surface are rotationally symmetrical, the first plane and the second plane are parallel to each other, the height h of the first plane is 3a-5a, the allowable processing line radius is 1.5a-2.5a, and the specific position relationship is as shown in the attached Figure 4 As shown in the multiple guide partitions.

[0042] like Figure 4 As shown, in a further embodiment, the first oven section, the second oven section, the third oven section, the fourth oven section and the fifth oven section are all provided with partitions with small holes, and the shape of the small holes is a combination of semicircles at both ends and a rectangle in the middle, the radius of the semicircles at both ends is 3a-5a, and the total length is 12a-20a. Negative pressure is set inside the ovens, the first oven section is set at -10kPa, the second oven section and the third oven section are set at -5kPa, and the fourth oven section and the fifth oven section are set at -2kPa.

[0043] Embodiment 2

[0044] This embodiment is a further description of the above embodiment. It should be understood that this embodiment includes all the aforementioned technical features and is further described in detail.

[0045] like Figure 3 and Figure 4As shown, a line surface treatment device is applied to the above-mentioned line surface treatment process, including a coating device 1 and an axial flow fan 7. The coating device 1 coats the line with solvent after coating and leveling, and the solvent drops into the scrubber 8 through the control valve 2. After being processed by the scrubber 8, the solvent enters the solvent collection tank. The axial flow fan 7 is connected with the first oven, the second oven, the third oven, the fourth oven and the fifth oven, and the bottom of the first oven, the second oven, the third oven and the fourth oven is connected with the heat exchanger 3. It is connected to the hot air blower 4, and the hot air blower 4 is connected to the fifth oven. The axial flow fans 7 connected to the tops of the first oven, the second oven, the third oven, and the fourth oven are connected to the scrubbing tower 8 through the heat exchanger 3 and the second circulation pipe 6. The axial flow fan 7 on the top of the fifth oven is connected to the hot air blower 4 connected to the bottom of the fifth oven through the first circulation pipe 5. The control valve 2, the axial flow fan 7 and the hot air blower 4 are all arranged in five groups, and the heat exchanger 3 is arranged in four groups, and the scrubbing tower 8 is arranged in two groups.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A line surface treatment process, characterized in that: The following steps are involved: S1, curtain coating stage: the lines are curtain coated through the inclined drying tunnel, and there are tension adjustment rollers and height adjustment rollers in front of the curtain coating position. The tension of the lines is adjusted by the tension adjustment roller, and the inclination angle of the lines is fine-tuned by the height adjustment roller. The excess coating will drip from the bottom of the height adjustment roller. S2, segmented heating stage: the lines after the coating treatment enter the first oven, the second oven, the third oven, the fourth oven and the fifth oven in turn for segmented heating and drying; S3, gas treatment stage: the gases generated during the drying process of the first oven, the second oven, the third oven, the fourth oven and the fifth oven are classified and treated and then circulated and discharged into the corresponding ovens after treatment; S4, solvent recovery stage: the solvent is recovered through the solvent collection tank, the solvent collection tank is connected to the flow meter, the flow valve and then the batching tank, the batching tank has a viscometer, and the resin tank and the auxiliary material tank are connected to the flow meter, the flow valve and then the batching tank, the resin and the auxiliary material are automatically controlled according to the set ratio, the viscometer automatically tests the viscosity change, and automatically controls the solvent flow valve to keep the viscosity within the set range.

2. A line surface treatment process according to claim 1, characterized in that: The S1 flow coating treatment stage starts from the flow coating position and is tilted upward at an angle of 15-30°, and there is a leveling distance from the flow coating to the low temperature section.

3. A line surface treatment process according to claim 1, characterized in that: The first section of the oven in the S2 segmented heating stage is a low-temperature leveling zone, the temperature of which is lower than the boiling point of the solvent. The solvent is selected to have a boiling point of 70-90°C, and the temperature of the first section of the oven is set at 40-60°C, and partitions with slits are used at the front and rear ends. The temperature of the second section of the oven in the S2 segmented heating stage is set near the boiling point of the solvent, set at 70-90°C, with an air flotation device, and a partition with small holes is used at the rear end.

4. The line surface treatment process according to claim 1, characterized in that: The temperature of the third oven is higher than the boiling point of the solvent, set at 100-120°C, to eliminate residual solvent, with an air flotation device, and a partition with small holes at the rear end. The temperature of the fourth oven is set at the curing temperature, 120-150°C, and a partition with small holes is used at the rear end. The temperature of the fifth oven is set at 60-80°C, and there are height adjustment rollers and tension adjustment pressure rollers behind the fifth oven.

5. The line surface treatment process according to claim 1, characterized in that: The gas discharged from the third oven in the S3 gas treatment stage has a low solvent content. The exhaust pipe is connected to a primary solvent recovery tower. There is a coil in the tower, and the solvent-containing gas flows through the outside of the coil. The coil is usually warm air. The solvent condenses on the outer surface of the coil and is collected and discharged from the bottom pipe of the tower. The gas treated by the primary solvent recovery tower is still at a high temperature and still contains a low concentration of gaseous solvent. This part of the gas is heated by a heater and enters the second oven.

6. The line surface treatment process according to claim 1, characterized in that: In the S3 gas treatment stage, the second section of the oven is externally connected to a secondary solvent recovery tower, which has two separated heat exchange sections. The first section is air condensation, and the solvent-containing gas flows through the coil. There is a glass spring filler in the coil. The solvent condenses on the inner wall of the coil and is collected and discharged from the bottom; the second section is cold water condensation, the water temperature is 0-10°C, the solvent-containing gas flows through the coil. There is a glass spring filler in the coil. The solvent condenses on the inner wall of the coil and is collected and discharged from the bottom. The gas discharged from the secondary solvent recovery tower still has a small amount of gaseous solvent, which enters the first section of the oven after heating.

7. The line surface treatment process according to claim 1, characterized in that: In the S3 gas treatment stage, the first section of the oven is externally connected to a three-stage solvent recovery tower, which has two separated heat exchange sections. The first section is water condensation, and the water condensed in the second section from the secondary solvent recovery tower, the solvent-containing gas flows through the coil, the coil has a glass spring filler, the solvent condenses on the inner wall of the coil, and is collected and discharged from the bottom. The second section is chilled water condensation, the water temperature is -10 to -5°C, the solvent-containing gas flows through the coil, the coil has a glass spring filler, the solvent condenses on the inner wall of the coil, and is collected and discharged from the bottom. The gas discharged from the three-stage solvent recovery tower is discharged after RTO incineration.

8. The line surface treatment process according to claim 1, characterized in that: The air flotation device of the second oven in the S2 segmented heating stage comprises a guide baffle, an air inlet is provided at the bottom of the guide baffle, and a top structure of the guide baffle is composed of three curved surfaces and two flat surfaces on one side.

9. The line surface treatment process according to claim 1, characterized in that: The first oven, the second oven, the third oven, the fourth oven and the fifth oven are all provided with partitions with small holes, and the small holes are in the shape of a combination of semicircles at both ends and a rectangle in the middle.

10. A line surface treatment device, characterized in that: A line surface treatment process applied to any one of claims 1 to 9, comprising a coating device (1) and an axial flow fan (7), wherein the coating device (1) allows the solvent dropped after coating and leveling the line to enter a scrubber (8) through a control valve (2), and then enters a solvent collection tank after being processed by the scrubber (8), and the axial flow fan (7) is connected to a first oven section, a second oven section, a third oven section, a fourth oven section and a fifth oven section, and the first oven section, the second oven section, The bottoms of the third and fourth ovens are connected to the heat exchanger (3) and the hot air blower (4), and the hot air blower (4) is connected to the fifth oven. The axial flow fans (7) connected to the tops of the first, second, third and fourth ovens are connected to the scrubbing tower (8) via the heat exchanger (3) and the second circulation pipeline (6). The axial flow fan (7) at the top of the fifth oven is connected to the hot air blower (4) connected to the bottom of the fifth oven via the first circulation pipeline (5).

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