High-efficiency waste heat recovery setting machine

Abstract

The present invention discloses a high-efficiency waste heat recovery setting machine, which includes several heat recovery devices connected in series or in parallel. The N oven sections in front of the oven body are preheating sections equipped with air inlets, and the remaining ovens are divided into several setting sections connected from front to back. Each setting section includes one or more oven sections. The exhaust ports of the ovens on each setting section are communicated and connected to one corresponding heat recovery device. The exhaust gas discharged from the ovens on the setting section enters the corresponding heat recovery device, is cooled by heat exchange, and then discharged. The exhaust ports of the ovens in the preheating section are communicated and also connected to one corresponding heat recovery device. The exhaust gas discharged from the ovens in the preheating section enters the corresponding heat recovery device, is cooled by heat exchange, and then discharged. The outside air enters the ovens in the preheating section after being heated by heat exchange through one or more heat recovery devices. The present invention provides a high-efficiency waste heat recovery setting machine that can be used efficiently and flexibly while reducing waste of heat discharge.

Description

Technical Field

[0001] The present invention relates to a high-efficiency waste heat recovery setting machine and belongs to the technical field of setting machine equipment.

Background Art

[0002] A setting machine is an important piece of equipment for finishing fabrics after padding and dyeing. It can improve the feel, slipperiness, color, width, strength, appearance, etc. of fabrics, and is applied to various types of fabrics. After finishing with a setting machine, the size of the fabric can be stabilized. The setting machine is also a major energy-consuming equipment in the padding and dyeing industry of fibers. It is a device for setting fabrics by using hot air to dry and finish the fabrics. Existing setting machines mainly consist of an oven body and a fabric roll conveying device, etc. Here, the oven body is composed of several sections of ovens connected and combined in order from front to back. Each oven section is equipped with a relatively independent hot air circulation device, heating device, exhaust duct, and auxiliary air inlet. The fabric before entering the oven body of the setting machine contains moisture and additives such as padding assistants and dyeing assistants remaining during the weaving process. Since the hot air temperature inside the oven body of the setting machine is generally about 200°C, when the fabric passes through the oven body of the setting machine, the exhaust gas generated by high-temperature baking contains a large amount of water vapor, dyes and assistant organic substances evaporated at high temperature, evaporated solvents, and mechanical impurities such as fine yarn waste fibers of the fabric. The exhaust gas still maintains a relatively high temperature of about 170°C. If these exhaust gases are reused as they are, the impurities contained in the exhaust gas will contaminate the fibers. Currently, generally, heat is recovered through a heat exchanger and then reused. In existing setting machines, before the cold air enters the oven, it is usually heated by heat exchange only once and then enters the oven of the setting section. On the one hand, it is difficult to fully and efficiently recover the heat of the exhaust gas according to the actual situation. On the other hand, the temperature difference between the cold air after heating and the temperature inside the setting section is large, and the temperature stability is poor, which affects the setting effect.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The technical problem to be solved by the present invention is that cold air can be heat-exchanged once or multiple times according to actual needs to recover the heat of exhaust gas and be used as the initial hot air of the setting machine, and it can help to stabilize the temperature while reducing waste of heat discharge, and provide a high-efficiency waste heat recovery setting machine that can solve the drawbacks of the prior art.

Means for Solving the Problems

[0004] The technical solution of the present invention is as follows. A high-efficiency waste heat recovery setting machine including an oven body composed of a plurality of oven sections provided with exhaust ports arranged in order from front to back, including several heat recovery devices connected in series or in parallel, the first N oven sections in front of the oven body are preheating sections provided with air inlets, and the remaining ovens are divided into several setting sections connected in sequence from front to back, each setting section includes one or more oven sections, the exhaust ports of the ovens on each setting section are communicated and connected to a corresponding heat recovery device, the exhaust gas discharged from the ovens on the setting section enters the corresponding heat recovery device, is cooled by heat exchange and then discharged, the exhaust ports of the ovens in the preheating section are communicated and also connected to a corresponding heat recovery device, the exhaust gas discharged from the ovens in the preheating section enters the corresponding heat recovery device, is cooled by heat exchange and then discharged, the heat recovery device is communicated with the air inlet on the oven in the preheating section, and the outside air enters the oven in the preheating section after being heated by heat exchange through one or more heat recovery devices.

[0005] Furthermore, a removable filter is installed at the exhaust port of each oven section.

[0006] Furthermore, all of the heat recovery devices include a base and a plurality of heat exchangers installed on the base. All of the plurality of heat exchangers include an external shell and a plurality of heat exchange tubes vertically installed in the shell. A passage communicating with some of the heat exchangers is provided in the base.

[0007] Furthermore, a set of tube sheets with uniformly arranged tube holes are installed in the shell of the heat exchanger. The plurality of heat exchange tubes are installed between the two tube sheets and communicated with the corresponding tube holes respectively. Some or all of the heat exchange tubes are thin metal tubes with a wall thickness of 1 mm or less. Both ends of the thin metal tubes are inserted and connected by connection pipe sleeves. The connection pipe sleeves at both ends are fixedly connected by welding or expanding through an expander to the corresponding tube holes of the corresponding tube sheets.

[0008] Furthermore, some of the heat exchange tubes are thick metal tubes with a wall thickness of 1.5 mm or more. Both ends of the thick metal tubes are fixedly connected by welding or expanding through an expander to the corresponding tube holes of the corresponding tube sheets to provide support between the tube sheets.

[0009] Furthermore, after the connection pipe sleeve is fixed on the tube sheet, the connection end with the thin metal tube is located inside the tube sheet, and the thin metal tube is inserted inside or outside the tube.

[0010] Furthermore, the connection surface where the connection pipe sleeve and the thin metal tube are inserted and connected and matched is a guide cone surface.

[0011] Furthermore, the other end of the connection pipe sleeve includes an outer flange. When the connection pipe sleeve is inserted and connected to the tube hole of the tube sheet, the outer flange is limited and stopped outside the tube sheet.

[0012] Furthermore, the heat exchange tube is a spiral tube with an inner wall and an outer wall extruded. Both ends of the spiral tube are connection ends without spiral extrusion.

[0013] Furthermore, it includes a lifting stand with adjustable lifting height. The waste heat recovery device includes a waste heat inlet, a waste heat outlet, a cold air inlet, and a hot air outlet. On the lifting stand, ventilation pipes communicating with the waste heat inlet, the waste heat outlet, the cold air inlet, and the hot air outlet are connected. The ventilation pipes include flexible connection sections.

[0014] Furthermore, an isolation device is provided between the preheating section and the adjacent setting section. The isolation device separates the remaining space above and below the oven except for the conveyance of the fabric.

Advantages of the Invention

[0015] By implementing the present invention, the exhaust gas from the preheating section oven is discharged after heat exchange and cooling through the corresponding waste heat recovery device. The exhaust gas from the ovens of several setting sections is also discharged after heat exchange and cooling through the corresponding waste heat recovery devices respectively. The waste heat recovery devices are connected in series or in parallel with the waste heat recovery device and communicate with the upper air inlet of the preheating section oven. The outside air enters the preheating section oven after being heat-exchanged and heated by one or more waste heat recovery devices according to actual needs, and is used as the initial hot air instead of the heating device. The temperature difference with the preheating section is also smaller, reducing the waste of heat discharge, being efficiently and flexibly utilizable, and being beneficial to maintaining temperature stability at the same time.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0017] Example 1: As shown in FIGS. 1 to 3, the high-efficiency waste heat recovery setting machine includes an oven body of a plurality of oven sections arranged in order from front to back. In this embodiment, it is a 10-section oven. An exhaust port is provided in oven 1. The oven 1 in sections 1 to 3 of the oven body is a preheating section 2 with an air inlet. The ovens in sections 4 to 7 and the ovens in sections 8 to 10 are two connected setting sections 3 and 3A. Heating devices are provided in the ovens of the setting sections 3 and 3A. The heating devices are conventional radiators or burners for the setting machine. The exhaust ports of the ovens on the setting section 3 are communicated and connected to the waste heat recovery device 4. The exhaust gas discharged from the ovens on the setting section 3 is heat-exchanged and cooled by the waste heat recovery device 4 and then discharged. The exhaust port of oven 1 on the setting section 3A is communicated and connected to the waste heat recovery device 4A. The exhaust gas discharged from oven 1 on the setting section 3A is heat-exchanged and cooled by the waste heat recovery device 4A and then discharged. The exhaust port of oven 1 in the preheating section 2 is communicated and connected to the waste heat recovery device 4B. The exhaust gas discharged from oven 1 in the preheating section 2 is heat-exchanged and cooled by the waste heat recovery device 4B and then discharged. The waste heat recovery device 4B is connected in series or in parallel with the waste heat recovery devices 4 and 4A and communicated with the upper air inlet of oven 1 in the preheating section 2. According to actual needs, the outside air can pass through any one of the waste heat recovery devices 4, 4A, and 4B to be heated up in a single heat exchange, or pass through two of them to be heated up in two heat exchanges, and then enter the preheating section 2 and be used as the initial hot air to replace the heating device. Since the hot air temperature entering oven 1 in front of the preheating section 2 is lower than the hot air temperature entering the inner oven 1, oven 1 in the preheating section 2 is gradually heated up. The specific connection method is as shown in FIG. 1. The outside air can pass through the waste heat recovery device 4B for one heat exchange and then pass through the waste heat recovery device 4 or the waste heat recovery device 4A for two heat exchanges and then enter the first to second sections 1 of oven 1 in the preheating section 2 respectively. As shown in FIG. 2, the outside air can pass through the waste heat recovery device 4B for one heat exchange and then enter the oven in the first section of the preheating section 2,After passing through the heat recovery device 4 and then through the heat recovery device 4A for two heat exchanges, it enters the second oven section of the preheating section 2. As shown in FIG. 3, the outside air enters the first oven section of the preheating section 2 after passing through the heat recovery device 4B for one heat exchange, enters the second oven section of the preheating section 2 after passing through the heat recovery device 4 for heat exchange, and enters the third oven section of the preheating section 2 after passing through the heat recovery device 4A for heat exchange. The hot air temperature in the setting sections 3 and 3A is generally about 200°C, but the hot air temperature in the preheating section 2 is less than 200°C. Therefore, when the outside air enters the preheating section 2 after being heated by heat exchange, it has a lower temperature, which is beneficial for temperature stability. The outside air temperature after heat exchange with the heat recovery device 4B is lower than the outside air temperature after heat exchange with the heat recovery devices 4 and 4A. According to this feature, the heat recovery device 4B and the heat recovery devices 4 and 4A are connected in series and in parallel. The hot air temperature entering the oven in front of the preheating section 2 is lower than the hot air temperature entering the inner oven 1, which can be used efficiently and flexibly while reducing waste of heat discharge. Otherwise, to reduce the heat loss of the piping and make the length of the distance of each connected exhaust pipe and heating pipe as short as possible, the heat recovery devices 4, 4A, and 4B are installed above or adjacent to the corresponding setting sections 3, 3A, and the preheating section 2.,

[0018] Furthermore, a removable filter 6 is installed at the exhaust port of each oven section 1 to perform preliminary filtration on the exhaust gas and reduce the risk of clogging of the heat exchanger.

[0019] Furthermore, as shown in FIGS. 4 to 6, all of the heat recovery devices 4, 4A, and 4B include a base 7 and a plurality of heat exchangers 8, 8A installed on the base 7. In this embodiment, there are two heat exchangers 8, 8A, and all of the heat exchangers 8, 8A include an external shell 9 and a plurality of heat exchange tubes vertically installed in the shell 9. Inside the base 7, a passage is provided through which the heat exchange tubes of the two heat exchangers 8 and the heat exchanger 8A communicate. The base 7 is provided with a valve and an inspection port. During use, the high-temperature exhaust gas enters the passage of the base 7 after passing through the heat exchange tubes of the heat exchanger 8 and is discharged from the heat exchange tubes of the other heat exchanger 8A. The outside air exchanges heat with the high-temperature exhaust gas in the heat exchange tubes inside the shell 9, enters from the heat exchanger 8A into the heat exchanger 8, and after the temperature rises, enters the preheating section 2 of the oven body. The heat exchange tubes are vertically installed. After cooling, the condensed water, dyes, and auxiliary organic substances in the exhaust gas flow into the passage of the base 7 along the heat exchange tubes. The condensed water can be discharged from the valve, and in order to prevent clogging of the heat exchanger, other impurities accumulated from the inspection port can be regularly cleaned.

[0020] Furthermore, inside the shell 9, a set of tube sheets 10, 10A with uniformly arranged tube holes are installed. The heat exchange tubes are installed between the tube sheets 10, 10A and communicate with the corresponding tube holes respectively. The heat exchange tubes used in this embodiment are thin metal tubes 13 with a wall thickness of 1 mm or less. The wall thickness of the thin metal tubes 13 is preferably 0.2 mm to 0.5 mm and can be made of materials such as stainless steel, copper, aluminum, titanium, etc. Among them, the wall thickness of the stainless steel material is most preferably 0.35 mm. At both ends of the thin metal tubes 13, all are inserted and connected with connection pipe sleeves 14. The connection pipe sleeves 14 at both ends are welded or expanded and connected to the corresponding tube holes of the tube sheets 10, 10A for fixation. By using the thin metal tubes 13, it has a lower material cost. At the same time, the heat exchange area per unit cross-sectional area increases, improving the heat exchange efficiency. Since both ends are inserted and connected to the connection pipe sleeves 14 that are welded or expanded and connected to the corresponding tube holes of the corresponding tube sheets for fixation, the thin metal tubes 13 do not need to be directly welded or expanded using an expander, so the situation of burning out or bursting does not occur.

[0021] As a preference, as shown in FIGS. 7 to 8, after the connection pipe sleeve 14 is fixed on 10, 10A, the connection ends of the connection pipe sleeve 14 and the thin metal pipe 13 are located inside the tube sheets 10, 10A. The connection pipe sleeve 14 protrudes from the inside of the tube sheets 10, 10A by a certain length, and the thin metal pipe 13 can be inserted into the inside or outside of the pipe as required, making the connection more flexible.

[0022] As a preference, the inner wall surface 15 and the outer wall surface 16 of the connection ends of the connection pipe sleeve 14 and the thin metal pipe 13 are all guide cone surfaces. As shown in FIG. 9, the outer wall surface 16 can be a guide cone surface. As shown in FIG. 10, the inner wall surface 15 is a guide cone surface. As shown in FIG. 11, the inner wall surface 15 and the outer wall surface 16 are all guide cone surfaces. When the thin metal pipe 13 is inserted into the pipe or outside the pipe, it plays a guiding role, facilitating alignment and matching connection. In the printing and dyeing industry, basically gas-to-gas heat exchange is used and high sealing performance is not required. Therefore, the connection pipe sleeve 14 and the thin metal pipe 13 can be directly inserted and connected. Of course, in order to improve the sealing performance, an adhesive can also be used to bond the two joints.

[0023] As a preference, the other end of the connection pipe sleeve 14 includes an outer flange 17. The middle section of the connection pipe sleeve 14 is a pipe hole matching section 19. A stepped stop point 26 is formed between the pipe hole matching section 19 and the guide cone surface. When the connection pipe sleeve 14 is connected to the pipe holes of the tube sheets 10, 10A through the middle pipe hole matching section 19, the outer flange 17 is limited and stopped outside the tube sheets 10, 10A, and the stop point 26 can stop the thin metal pipe 13. Therefore, the connection pipe sleeve 14 can be arranged at a specific position of the pipe hole on the tube sheets 10, 10A, which is convenient for accurately arranging the connection pipe sleeve 14 and then being fixedly connected through subsequent welding or an expanding machine for expansion.

[0024] As a preference, the thin metal tube 13 is a spiral tube with an inner wall and an outer wall extruded. The tube wall is extruded to form a spiral. Both ends of the spiral tube are connection ends provided with spiral extrusion, which is convenient for tightly connecting with the pipe holes of the connection pipe sleeve 14 or the tube plates 10, 10A. By using the spiral tube, not only the heat exchange area is increased, but also turbulence occurs when the medium passes through, generating rotational recirculation, thus further improving the heat exchange efficiency of the two media inside and outside the tube.

[0025] As a preference, inside the shell 9, several partition plates 18 located between the thin metal tubes 13 are installed. The several partition plates 18 guide the medium located outside the thin metal tubes 13 and convey it in a meandering shape, extending the heat exchange distance and time of the medium in the heat exchanger, improving the heat exchange efficiency. At the same time, the partition plates 18 also have the effect of reinforcing the heat exchange tubes. In particular, since the thin metal tubes 13 have thin tube walls and are prone to deformation, they are reinforced by the partition plates 18, enhancing the resistance to deformation.

[0026] As a preference, the heat recovery device 4B or the heat recovery devices 4, 4A including the lift stand 20 that can be adjusted in height, and including the base 7 and several heat exchangers 8, 8A installed on the base 7, are all one device equipped with a cold air inlet 21, a cold air outlet 22, a hot air inlet 23, and a hot air outlet 24. The cold air inlet 21, the cold air outlet 22, the hot air inlet 23, and the hot air outlet 24 are respectively connected to the ventilation pipes in a soft manner. The ventilation pipes are installed on the lift stand 20. By raising and lowering the lift stand 20, each ventilation pipe can be moved up and down, facilitating the removal of the heat recovery device 4B or the heat recovery devices 4, 4A, and also facilitating the replacement and cleaning of the heat recovery device 4B or the heat recovery devices 4, 4A.

[0027] Furthermore, it includes a lifting stand 20 that can be adjusted in height. The waste heat recovery devices 4, 4A, 4B include a waste heat inlet 23, a waste heat outlet 24, a cold air inlet 21, and a hot air outlet 22. The lifting stand 20 is connected with ventilation pipes communicating with the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21, and the hot air outlet 22. The ventilation pipes include flexible connection sections. The exhaust gas enters from the waste heat inlet 23, is cooled by heat exchange, and then is discharged from the waste heat outlet 24. The outside air enters from the cold air inlet 21, is heated by heat exchange, and then enters the preheating section 2 oven from the hot air outlet 22. Here, the telescopic threaded pipe in the ventilation pipe is the flexible connection section. At the ports of the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21, and the hot air outlet 22, joints matching the ends of the corresponding ventilation pipes are provided. By raising and lowering the lifting stand 20, the ventilation pipes provided with flexible connection sections can be extended and retracted to disconnect and remove the connections with the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21, and the hot air outlet 22, which is convenient for removing, changing, and cleaning the waste heat recovery devices 4, 4A, 4B.

[0028] As a preference, as shown in FIG. 3, between the preheating section 2 and the adjacent setting section 3, or between the ovens adjacent to the preheating section 2, an isolation device 25 is provided. The isolation device 25 separates the remaining space above and below the oven except for the conveyance of the cloth. Since the temperature of the setting sections 3, 3A is high and the temperature in the preheating section 2 is relatively low, by providing the isolation device 25, the heat flow from the setting sections 3, 3A to the preheating section 2 is reduced, and the setting efficiency is improved.

[0029] Example 2: The difference from Example 1 lies in the heat exchange tube part of the heat exchanger. A part of the heat exchange tube is a thick metal tube with a wall thickness of 1.5 mm or more. Both ends are directly welded or expanded and connected to the corresponding tube holes of the tube sheets 10 and 10A through an expanding machine and fixed. Since the number of heat exchange tubes in the heat exchanger generally reaches dozens or even hundreds in some cases, dozens or hundreds of tube holes are formed in the tube sheets 10 and 10A, and the tube sheets 10 and 10A are filled with tube holes. Without supporting the tube sheets 10 and 10A, the strength is insufficient and deformation occurs. When all the heat exchange tubes used are thin metal tubes 13, they are only inserted and connected into the connection pipe sleeve 14 and installed between the tube sheets 10 and 10A. And since its own strength is not insufficient, it cannot play a supporting role. Some heat exchange tubes use thick metal tubes with a wall thickness of 1.5 mm or more, and by expanding and connecting and fixing the thick metal tubes to the corresponding tube holes of the tube sheets 10 and 10A through an expanding machine, the purpose of supporting the tube sheets 10 and 10A to prevent deformation can be achieved. The number of thick metal tubes does not need to be large, and the number and connection positions can be selected according to actual needs. For example, when there are a total of 100 heat exchange tubes, 4 thick metal tubes and 96 thin metal tubes can be used. The 4 thick metal tubes are installed at the four corners of the tube sheets 10 and 10A. The remaining structure is the same as that in Example 1 and will not be described again.

[0030] The above is only a preferred embodiment of the present invention. Any equivalent changes or modifications based on the structures, features, and principles described in the patent application scope of the present invention are included in the patent application scope of the present invention.

Explanation of Reference Numerals

[0031] Oven 1; Preheating section 2; Setting sections 3, 3A; Heat recovery devices 4, 4A, 4B; Filter 6; Base 7; Heat exchangers 8, 8A; Shell 9; Tube sheets 10, 10A; Thin metal tubes 13; Connection pipe sleeve 14; Inner wall surface 15; Outer wall surface 16; Outer flange 17; Partition plate 18; Tube hole matching section 19; Lifting stand 20; Cold air inlet 21; Hot air outlet 22; Waste heat inlet 23; Waste heat outlet 24; Isolation device 25; Stop point 26

Claims

1. A high-efficiency waste heat recovery setting machine including an oven body composed of a plurality of oven sections provided with exhaust ports arranged in order from front to back, including several heat recovery devices connected in series or in parallel, wherein the N oven sections in front of the oven body are preheating sections provided with air inlets, and the remaining ovens are divided into several setting sections connected from front to back, each of the setting sections includes one or more oven sections, the exhaust ports of the ovens on each setting section are communicated and connected to one corresponding heat recovery device, the exhaust gas discharged from the ovens on the setting section enters the corresponding heat recovery device, is cooled by heat exchange and then discharged, the exhaust ports of the ovens in the preheating section are communicated and also connected to one corresponding heat recovery device, the exhaust gas discharged from the ovens on the preheating section enters the corresponding heat recovery device, is cooled by heat exchange and then discharged, the heat recovery device is communicated with the air inlet on the oven in the preheating section, and the outside air enters the oven in the preheating section after being heated by heat exchange through one or more heat recovery devices, characterized in that the high-efficiency waste heat recovery setting machine.

2. All of the heat recovery devices include a base and several heat exchangers installed on the base. All of the several heat exchangers include an external shell and a plurality of heat exchange tubes vertically installed in the shell. A passage communicating the several heat exchangers is provided in the base, characterized in that the high-efficiency waste heat recovery setting machine according to Claim 1.

3. A set of tube sheets with uniformly arranged tube holes are installed in the shell of the heat exchanger. The plurality of heat exchange tubes are installed between the two tube sheets and communicated with the corresponding tube holes respectively. Some or all of the heat exchange tubes are thin metal tubes with a wall thickness of 1 mm or less. Both ends of the thin metal tubes are inserted and connected by connection pipe sleeves, and the connection pipe sleeves at both ends are fixedly connected by welding or expansion connection through an expansion machine to the corresponding tube holes of the corresponding tube sheets, characterized in that the high-efficiency waste heat recovery setting machine according to Claim 2.

4. A part of the heat exchange tube is a thick metal tube with a wall thickness of 1.5 mm or more. Both ends of the thick metal tube are fixedly connected by welding or expansion connection through an expansion machine to corresponding tube holes of the corresponding tube sheets to provide support between the tube sheets. The high-efficiency waste heat recovery setting machine according to claim 3.

5. After the connection pipe sleeve is fixed on the tube sheet, the connection end with the thin metal tube is located inside the tube sheet, and the thin metal tube is inserted inside or outside the tube. The high-efficiency waste heat recovery setting machine according to claim 3 or 4.

6. The connection surface where the connection pipe sleeve and the thin metal tube are inserted and connected and matched is a guide cone surface. The high-efficiency waste heat recovery setting machine according to claim 5.

7. The other end of the connection pipe sleeve includes an outer flange. When the connection pipe sleeve is inserted and connected to the tube hole of the tube sheet, the outer flange is limited and stopped outside the tube sheet. The high-efficiency waste heat recovery setting machine according to claim 5.

8. The heat exchange tube is a spiral tube with an inner wall and an outer wall extruded, and both ends of the spiral tube are connection ends without spiral extrusion. The high-efficiency waste heat recovery setting machine according to claim 3 or 4.

9. Including a lifting stand that can be adjusted up and down, the waste heat recovery device includes a waste heat inlet, a waste heat outlet, a cold air inlet, and a hot air outlet. On the lifting stand, ventilation pipes that match and communicate with the waste heat inlet, the waste heat outlet, the cold air inlet, and the hot air outlet are connected, and the ventilation pipes include flexible connection sections. The high-efficiency waste heat recovery setting machine according to claim 2.

10. An isolation device is provided between the preheating section and the adjacent setting section. The isolation device separates the remaining space above and below the oven except for the conveyance of the cloth. The high-efficiency waste heat recovery setting machine according to claim 1.

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