Efficient waste heat recovery setting machine

Abstract

Disclosed in the present invention is an efficient waste heat recovery setting machine. The setting machine comprises several heat recovery devices connected in series or in parallel, wherein front N oven sections of an oven body are preheating sections provided with air inlets, and the remaining ovens are divided into several connected setting sections from front to back; each setting section includes one to several oven sections; air outlets of the ovens on each setting section are in communication with one another and are connected to one corresponding heat recovery device; tail gas discharged from the ovens on the setting section enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged; air outlets of the ovens on the preheating sections are in communication with one another and are also connected to one corresponding heat recovery device; tail gas discharged from the ovens on the preheating sections enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged; and external air enters the ovens on the preheating sections after being subjected to heat exchange and heating in one or more heat recovery devices. The present invention provides the efficient waste heat recovery setting machine, which can efficiently and flexibly utilize waste heat while reducing discharge waste of heat.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an efficient waste heat recovery setting machine, belonging to the technical field of setting machine equipment. BACKGROUND

[0002] Setting machine is important equipment for textile printing-dyeing finishing, which can improve the hand feeling, slippage, color, fabric width, strength, and appearance of textiles, and is applied to various textile varieties. The finishing of the setting machine can stabilize the size of fabrics. The setting machine is also the main energy-consuming equipment in textile printing and dyeing industry, which is a device for drying, finishing and setting fabrics by using hot air. The existing setting machine is mainly composed of an oven body and a yardage roll conveying device. The oven body is formed by connecting and combining multiple ovens in turn from front to back, and each oven is provided with a relatively independent hot air circulating device, a heating device, an air exhaust duct, and a supplementary air inlet. Because the textile contains moisture before entering the oven body of the setting machine and contains additives such as printing and dyeing auxiliaries remaining in the weaving process, and the temperature of the hot air in 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 tail gas produced by high-temperature baking contains a lot of water vapor, dyes and auxiliary organic substances evaporated at high temperature, vaporized solvents, fine wool fibers of textiles and other mechanical impurities, and the tail gas is still kept at a high temperature of about 170C. If these tail gases are directly reused, the impurities contained in the tail gases will pollute the fabric. At present, the heat is generally recovered and reused through heat exchangers, while in the existing setting machine, the cold air, before entering the oven, usually enters the oven in the setting section after only once heat exchange and temperature rise. On the one hand, it is difficult to recover the heat of the tail gas fully and effectively according to the actual situation, on the other hand, the temperature difference between the heated cold air and the temperature in the setting section is large, which is not conducive to temperature stability and affects the setting effect. SUMMARY

[0003] The technical problem to be solved by the present disclosure is to provide an efficient 1 waste heat recovery setting machine. Cold air can be subjected to one or more heat exchanges according to the actual needs to recover the heat of the tail gas to serve as the early hot air for the setting machine, which is conducive to the stability of temperature while reducing the waste of heat emission, and can solve the shortcomings of the prior art.

[0004] The technical solution provided by the present disclosure is as follows: an efficient waste heat recovery setting machine includes an oven body composed of multiple ovens arranged in turn from front to back. Each oven is provided with an air outlet. The efficient waste heat recovery setting machine includes multiple heat recovery devices connected in series or in parallel. Front N ovens of the oven body are a preheating section provided with an air inlet, and the remaining ovens are divided into a plurality of connected setting sections from front to back. Each setting section comprises one to multiple ovens. Air outlets of the ovens in each setting section are in communication with one another and connected to one corresponding heat recovery device. Tail gas discharged from the ovens in the setting section enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged. Air outlets of the ovens in the preheating section are in communication with one another and connected to one corresponding heat recovery device. Tail gas discharged from the ovens in the preheating section enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged. The heat recovery devices are in communication with the air inlet on the oven of the preheating section, and external air enters the ovens in the preheating section after being subjected to heat exchange and heating in one or more heat recovery devices.

[0005] Further, a detachable filter screen is installed at the air outlet of each oven.

[0006] Further, the heat recovery device includes a base and multiple heat exchangers installed on the base. Each of the heat exchanger includes an external housing, and multiple heat exchange tubes vertically installed in the housing. The base is internally provided with a channel for communicating the multiple heat exchangers with one another.

[0007] Further, a group of tube sheets with uniformly distributed tube holes are installed in the housing of the heat exchanger, and the multiple heat exchange tubes are installed between the two tube sheets and are in communication with the corresponding tube holes, respectively. A part or all of the heat exchange tubes are thin metal tubes with a wall thickness of not more than 1 mm, both ends of the thin metal tube are inserted with connecting tube sleeves, and the connecting tube sleeves at both ends are welded to corresponding tube holes of the corresponding tube sheets, or fixed to the corresponding tube holes of the corresponding tube sheets in an expansion manner by tube expanders.

[0008] Further, a part of the heat exchange tubes are thick metal tubes with a wall thickness of not less than 1.5 mm, and both ends of the thick metal tubes are welded to the corresponding tube holes of the corresponding tube sheets, or fixed to the corresponding tube holes of the corresponding tube sheets in an expansion manner by the tube expanders to serve as support between the tube sheets.

[0009] Further, after the connecting tube sleeve is fixed to the tube sheet, a connecting end of the connecting tube sleeve and the thin metal tube is located at an inner side of the tube sheet, and the connecting tube sleeve is inserted into or sleeved outside the thin metal tube.

[0010] Further, after the connecting tube sleeve is fixed to the tube sheet, a connecting end of the connecting tube sleeve and the thin metal tube is located at an inner side of the tube sheet, and the connecting tube sleeve is inserted into or sleeved outside the thin metal tube.

[0011] Further, a connecting surface of the connecting tube sleeve for mating with the thin metal tube in an insertion manner is a guide conical surface.

[0012] Further, the other end of the connecting tube sleeve includes a protruding edge, and when the connecting tube sleeve is inserted into the tube hole of the tube sheet, the protruding edge and an outer side of the tube sheet form a limit stop.

[0013] Further, the heat exchange tube is a spiral tube with extruded inner and outer walls, and both ends of the spiral tube are connecting ends without spiral extrusion.

[0014] Further, the efficient waste heat recovery setting machine includes a height-adjustable lifting frame. The heat recovery device includes a waste heat inlet, a waste heat outlet, a cold air inlet, and a hot air outlet. A ventilation pipe in mating communication with the waste heat inlet, the waste heat outlet, the cold air inlet and the hot air outlet is connected to the lifting frame. The ventilation pipe includes a flexible connection section.

[0015] Further, an isolation device is arranged between the preheating section and the adjacent setting section, and the isolation device is used to separate remaining space of the oven up and down except for cloth feeding.

[0016] Through the implementation of the present disclosure, the tail gas of the oven in the preheating section is discharged after being subjected to heat exchange and cooling in the corresponding heat recovery device, and the tail gas of the oven in multiple setting sections is also discharged after being subjected to heat exchange and cooling in the corresponding heat recovery devices, respectively. The heat recovery devices are connected in series or parallel and are in communication with the air inlet of the oven in the preheating section. The external air, after being subjected to heat exchange and temperature rise in one or more heat recovery devices according to practical needs, enters the oven in the preheating section to serve as early hot air to replace a heating device, the temperature difference between the early hot air and the preheating section is small, the waste heat can be efficiently and flexibly utilized while reducing the waste of the heat emission, which is conducive to the stability of the temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a schematic diagram of a first connection according to the present disclosure;

[0018] FIG. 2 is a schematic diagram of a second connection according to the present disclosure;

[0019] FIG. 3 is a schematic diagram of a third connection according to the present disclosure;

[0020] FIG. 4 is a structural diagram of a first heat exchanger and a second heat exchanger;

[0021] FIG. 5 is a structural diagram of a heat exchanger;

[0022] FIG. 6 is an enlarged view of position B in FIG. 5;

[0023] FIG. 7 is a schematic diagram of external socket connection of a heat exchange tube and a connecting tube sleeve;

[0024] FIG. 8 is a schematic diagram of internal socket connection of a heat exchange tube and a connecting tube sleeve;

[0025] FIG. 9 is a first schematic diagram of a connecting tube sleeve according to the present disclosure;

[0026] FIG. 10 is a second schematic diagram of a connecting tube sleeve according to the present disclosure;

[0027] FIG. 11 is a third schematic diagram of a connecting tube sleeve according to the present disclosure.

[0028] In the drawings: 1-oven; 2-preheating section; 3, 3A-setting section; 4, 4A, 4B-heat recovery device; 6-filter screen; 7-base; 8, 8A-heat exchanger; 9-housing; 10, 10A-tube sheet; 13-thin metal tube; 14-connecting tube sleeve; 15-inner wall surface; 16-outer wall surface; 17-protruding edge; 18-partition; 19-tube hole mating section; 2-lifting frame; 21-cold air inlet; 22-hot air outlet; 23-waste heat inlet; 24-waste heat outlet; 25-isolation device; 26-dead point. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Embodiment 1

[0030] An efficient waste heat recovery setting machine, as shown in FIG. 1 to FIG. 3, includes an oven body composed of multiple ovens arranged in turn from front to back. In this embodiment, there are ten ovens 1. Each oven 1 is provided with an air outlet, the first to third ovens 1 of the oven body are a preheating section 2 provided with air inlets, the fourth to seventh ovens and the eighth to tenth ovens are two setting sections 3 and 3A connected to each other. A heating device is arranged in each oven of the setting sections 3 and 3A, and the heating device is a conventional heat sink or burner for the setting machine. Air outlets of the ovens 1 on the setting section 3 are in communication with one another and connected to a heat recovery device 4, and tail gas discharged from the ovens 1 in the setting section 3 is subjected to heat exchange and cooling in the heat recovery device 4, and is then discharged. Air outlets of the ovens 1 on the setting section 3A are in communication with one another and connected to a heat recovery device 4A, and tail gas discharged from the ovens 1 on the setting section 3A is subjected to heat exchange and cooling in the heat recovery device 4A, and is then discharged. Air outlets of the ovens 1 on the preheating section 2 are in communication with one another and connected to a heat recovery device 4B, and tail gas discharged from the ovens 1 on the preheating section 2 is subjected to heat exchange and cooling in the heat recovery device 4B, and is then discharged. The heat recovery device 4B is in serial or parallel connection with the heat recovery devices 4 and 4A and in communication with the air inlets of the ovens 1 on the preheating section 2. According to the actual needs, external air, after being subjected to once heat exchange and temperature rise in one of the heat recovery devices 4, 4A and 4B, or twice heat exchange and temperature rise in two of the heat recovery devices 4, 4A and 4B, can enter the preheating section 2 to serve as early hot air to replace the heating device, and a temperature of the hot air entering the oven 1 in the front of the preheating section 2 is lower than that of the hot air entering the oven 1 at the back of the preheating section, such that the oven 1 in the preheating section 2 is gradually heated up. The specific connection mode may be as shown in FIG. 1, the external air can enter the first to second ovens 1 in the preheating section 2 after being subjected to primary heat exchange in the heat recovery device 4B and then subjected to secondary heat exchange in the heat recovery device 4 or the heat recovery device 4A. As shown in FIG. 2, the external air enters the first oven in the preheating section 2 after being subjected to once heat exchange in the heat recovery device 4B, and then enters the second oven in the preheating section 2 after being subjected to twice heat exchange in the heat recovery device 4 and the heat recovery device 4A. As shown in FIG. 3, the external air enters the first oven in the preheating section 2 after being subjected to once heat exchange in the heat recovery device 4B, enters the second oven in the preheating section 2 after being subjected to heat exchange in the heat recovery device 4, and enters a third oven in the preheating section 2 after being subjected to heat exchange in the heat recovery device 4A. As the temperature of the hot air in the setting sections 3 and 3A is generally about 200 C, and the temperature of the hot air in the preheating section 2 is lower than 200 C, the external air entering the preheating section 2 has small temperature after being subjected to heat exchange and temperature rise, which is conducive to the stability of the temperature. As the temperature of the external air after exchanging heat with the heat recovery device 4B is lower than that of the external air after exchanging heat with the heat recovery devices 4 and 4A, the heat recovery device 4B is in serial connection or parallel connection with the heat recovery devices 4 and 4A according to the above characteristics, such that the temperature of the hot air entering the oven 1 in the front of the preheating section 2 is lower than that of the hot air entering the oven 1 at the back of the preheating section, and the heat can efficiently and flexibly utilized while reducing the waste of the heat emission. In addition, in order to reduce heat loss of the pipeline, a distance length of each connected exhaust tube and heating tube should be shortened as much as possible. The heat recovery devices 4, 4A and 4B are arranged above or beside the corresponding setting sections 3 and 3A and preheating section 2.

[0031] Further, a detachable filter screen 6 is installed at the air outlet of each oven 1 for primary filtering of the tail gas, thus reducing the blockage risk of the heat exchanger.

[0032] Further, as shown in FIG. 4 to FIG. 6, each of the heat recovery devices 4, 4A and 4B includes a base 7, and multiple heat exchangers 8 and 8A installed on the base. In this embodiment, the number of the heat exchangers 8 and 8A is two, and each of the heat exchangers 8 and 8A includes an external housing 9, and multiple heat exchange tubes vertically installed in the housing 9. The base 7 is internally provided with a channel for communicating heat exchange tubes of the heat exchanger 8 and the heat exchanger 8A. The base 7 is provided with a valve, and an inspection port. When in use, the high-temperature tail gas enters the channel of the base 7 after passing through the heat exchange tubes of the heat exchanger 8, and then is discharged from the heat exchange tubes of another heat exchanger 8A. The external air, after exchanging heat with the high-temperature tail gas in the heat exchange tube in the housing, enters the heat exchanger 8 for temperature rise from the heat exchanger 8A, and then enters the preheating section 2 of the oven body. The heat exchange tubes are vertically arranged, such that condensed water, dye and auxiliary organic matters in the cooled tail gas flow into the channel of the base 7 along the heat exchange tubes, and the condensed water can be discharged through the valve. In order to prevent the heat exchanger from being blocked, other impurities accumulated can be cleaned regularly through the inspection port.

[0033] Further, a group of tube sheets 10 and 10A with uniformly distributed tube holes is installed in the housing 9, the heat exchange tubes are installed between the tube sheets 10 and 10A to communicate with corresponding tube holes. In this embodiment, the used heat exchange tube is a thin metal tube 13 with a wall thickness of not greater than 1 mm, the wall thickness of the thin metal tube 13 preferably ranges from 0.2 mm to 0.5 mm, and the thin metal tube 13 may be made of stainless steel, copper, aluminum, titanium and other materials, where the wall thickness of the thin metal tube made of stainless steel is preferably 0.35 mm. Both ends of the thin metal tube 13 are inserted with connecting tube sleeves 14, and the connecting sleeves 14 at both ends are welded to corresponding tube holes of the corresponding tube sheets 10, 10A, or fixed to the corresponding tube holes of the corresponding tube sheets 10, 10A in an expansion manner by tube expanders. The use of the thin metal tube 13 makes the material cost lower, and meanwhile, the heat exchange efficiency is improved due to the increase of heat exchange area in the unit cross-sectional area. As the installation is achieved through the insertion of the connecting tube sleeves 14 which are welded to corresponding tube holes of the corresponding tube sheets 10, 10A, or fixed to the corresponding tube holes of the corresponding tube sheets 10, 10A in an expansion manner by tube expanders, and as the thin metal tube is not directly welded or expanded using the tube expander, a situation of burn-through or expansion-splitting is avoided.

[0034] Preferably, as shown in FIG. 7 to FIG. 8, after the connecting tube sleeve 14 is fixed to the tube sheets 10, 10A, a connecting end of the connecting tube sleeve 14 and the thin metal tube 13 is located at an upper inner side of the tube sheets 10, 10A, the connecting tube sleeve 14 exceeds the inner side of each of the tube sheets 10, 10A by a certain length, and the thin metal tube 13 may be in internal socket connection or external socket connection with the connecting tube sleeve as required, and the connection may be flexible.

[0035] Preferably, an inner wall surface 15 and an outer wall surface 16 of the connecting end of the connecting tube sleeve 14 and the thin metal tube 13 are guide conical surfaces. As shown in FIG. 9, the outer wall surface 16 is the guide conical surface. As shown in FIG. 10, the inner wall surface 15 is the guide conical surface. As shown in FIG. 11, the inner wall surface 15 and the outer wall surface 16 are both the guide conical surfaces, which can play a guide role when the connecting tube sleeve and the thin metal tube 13 are in internal socket connection or external socket connection, thus facilitating alignment and mating. In the printing and dyeing industry, it is basically gas-gas heat exchange and does not require high sealing performance, so the connecting tube sleeve 14 can be directly inserted into the thin metal tube 13. Certainly, in order to improve its sealing performance, adhesive may also be used to bond the joint of the connecting tube sleeve and the thin metal tube.

[0036] Preferably, the other end of the connecting tube sleeve 14 includes a protruding edge 17, a middle section of the connecting tube sleeve 14 is a tube hole mating section 19, and a stepped dead point 26 is formed between the tube hole mating section 19 and the guide conical surface. When the connecting tube sleeve 14 is connected to the tube holes of the tube sheets 10, 10A through the middle tube hole mating section 19, the protruding edge 17 and the outer side of the tube sheets 10, 10A form a limit stop, and the dead point 26 can stop the thin metal tube 13, such that the connecting tube sleeve 14 can be placed at a specific position of the tube holes on the tube sheets 10, 10A, which is convenient for the connecting tube sleeve 14 to be accurately placed for subsequent welding or fixation by the expansion of the tube expander.

[0037] Preferably, the thin metal tube 13 is a spiral tube with extruded inner and outer walls. The tube wall forms a spiral by extrusion, and both ends of the spiral tube are connecting ends with spiral extrusion, which is convenient for the spiral tube to be closely connected to the connecting tube sleeve 14 or the tube holes of the tube sheets 10, 10A. On the one hand, the heat exchange area is increased by adopting the spiral tube, on the other hand, when a medium causes disturbance when passing through, a rotating annular flow is generated, which further improves the heat exchange efficiency of the two media inside and outside the tube.

[0038] Preferably, multiple partitions 18 located between the thin metal tubes 13 are installed in the housing 9, which are used to guide the medium located outside the thin metal tubes 13 to be conveyed in a serpentine manner, such that the heat change distance of the medium in the heat exchanger is extended, the heat exchange time is prolonged, and the heat exchange efficiency is improved. Meanwhile, the partition 18 can also play a role in reinforcing the heat exchange tube. In particular, the thin metal tube 13 is easily deformed due to its thin wall, and the deformation resistance is enhanced by the partitions 18.

[0039] Preferably, the setting machine includes a height-adjustable lifting frame 20, including a base 7, and multiple heat exchangers 8, 8A installed on the base. Each of the heat recovery device 4B or the heat recovery devices 4 and 4A is an integer with a cold air inlet 21, a cold air outlet 22, a hot air inlet 23, and a hot air outlet 24. Each of the cold air inlet 21, the cold air outlet 22, the hot air inlet 23 and hot air outlet 24 is in flexible connection with a ventilation pipeline. The ventilation pipeline is installed on the lifting frame, and with the ascending and descending of the lifting frame 20, the ventilation pipeline can move up and down to be conveniently assembled to or disassembled from the heat recovery device 4B or the heat recovery devices 4, 4A, thus facilitating the replacement and cleaning of the heat recovery device 4B or the heat recovery devices 4, 4A.

[0040] Further, the setting machine includes a height-adjustable lifting frame 20. The heat recovery devices 4, 4A and 4B each include a waste heat inlet 23, a waste heat outlet 24, a cold air inlet 21, and a hot air outlet 22. A ventilation pipe in mating communication with each of the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21 and the hot air outlet 22 is connected to the lifting frame 20, and the ventilation tube includes a flexible connection section. The tail gas enters from the waste heat inlet 23 for heat exchange and cooling, and then is discharged from the waste heat outlet 24, the external air enters from the cold air inlet 21 for heat exchange and temperature rise, and then enters the oven in the preheating section 2 from the hot air outlet 22. One section of the ventilation pipe is a telescopic threaded pipe, which is the flexible connection section. A port of each of the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21 and the hot air outlet 22 is provided with a connector in fit with a tail end of the corresponding ventilation pipe. Through the ascending and descending of the lifting frame 20, the ventilation pipe with the flexible connection section can extend or retract to be connected to or detached from the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21 and the hot air outlet 22, thus facilitating the disassembly of the heat recovery devices 4, 4A and 4B for replacement and cleaning.

[0041] Preferably, as shown in FIG. 3, an isolation device 25 is arranged between the preheating section 2 and the adjacent setting section 3, or between the adjacent ovens in the preheating section 2. The isolation device 25 is used to separate remaining space of the oven up and down except for cloth feeding. As the temperature in the setting sections 3, 3A is high, and the temperature in the preheating section 2 is relatively low, the isolation device 25 is provided to reduce the heat flow from the setting sections 3, 3A to the preheating section 2, thus improving the setting efficiency.

[0042] Embodiment 2

[0043] The difference from Embodiment 1 is a heat exchange tube part of the heat exchanger, some heat exchange tubes are thick metal tubes with a wall thickness of not less than 1.5 mm. Both ends of the thick metal tube are directly welded to corresponding tube holes of the tube sheets 10, 10A, or fixed to corresponding tube holes of the tube sheets 10,10A through the expansion of tube expanders. As the number of heat exchange tubes in the heat exchanger usually reaches tens or even hundreds, the tube sheets 10 and 10A are covered with tube holes, and the tube sheets will be deformed if there is no enough support strength. If the used heat exchange tubes are all thin metal tubes 13, as the thin metal tubes are inserted between the tube sheets 10, 10A together with the connecting tube sleeves 14, and have no enough strength, the support function cannot be achieved. Some heat exchange tubes are replaced with thick metal tubes with a wall thickness of not less than 1.5 mm, and the thick metal tubes are fixed to the corresponding tube holes of the tube sheets 10, 10A by the tube expanders, such that the tube sheets 10, 10A can be supported so as not to be deformed. The number of the thick metal tubes need not be too much, and the number and connection position can be selected according to the actual needs. For example, there are 100 heat exchange tubes in total, which may include four thick metal tubes and ninety-six thin metal tubes 3. The four thick metal tubes are installed at four corners of the tube sheets 10, 10A, and other structures are the same as those in Embodiment 1, and thus will not described here.

[0044] The above is only the preferred embodiment of the present disclosure, so all equivalent changes or modifications made according to the structure, features and principles described in the patent application scope of the present disclosure are included in the patent application scope of the present disclosure. WHAT IS CLAIMED IS: 1. An efficient waste heat recovery setting machine, comprising an oven body composed of a plurality of ovens arranged in turn from front to back, wherein each oven is provided with an air outlet; the efficient waste heat recovery setting machine comprises a plurality of heat recovery devices connected in series or in parallel; front N ovens of the oven body are a preheating section provided with air inlets, and the remaining ovens are divided into a plurality of connected setting sections from front to back; each setting section comprises one to multiple ovens; air outlets of the ovens in each setting section are in communication with one another and connected to one corresponding heat recovery device; tail gas discharged from the ovens in the setting section enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged; air outlets of the ovens in the preheating section are in communication with one another and connected to one corresponding heat recovery device; tail gas discharged from the ovens in the preheating section enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged; the heat recovery devices are in communication with the air inlet on the oven of the preheating section, and external air enters the ovens in the preheating section after being subjected to heat exchange and heating in one or more heat recovery devices. 2. The efficient waste heat recovery setting machine according to claim 1, wherein the heat recovery device comprises a base and a plurality of heat exchangers installed on the base, each of the heat exchanger comprises an external housing, and a plurality of heat exchange tubes vertically installed in the housing, and the base is internally provided with a channel for communicating the multiple heat exchangers with one another. 3. The efficient waste heat recovery setting machine according to claim 2, wherein a group of tube sheets with uniformly distributed tube holes are installed in the housing of the heat exchanger, the plurality of heat exchange tubes are installed between the two tube sheets and are in communication with the corresponding tube holes, respectively, a part or all of the heat exchange tubes are thin metal tubes with a wall thickness of not more than 1 mm, both ends of the thin metal tube are inserted with connecting tube sleeves, and the connecting tube sleeves at both ends are welded to corresponding tube holes of the corresponding tube sheets, or fixed to the corresponding tube holes of the corresponding tube sheets in an expansion manner by tube expanders. 4. The efficient waste heat recovery setting machine according to claim 3, wherein a part of the heat exchange tubes are thick metal tubes with a wall thickness of not less than 1.5 mm, and both ends of the thick metal tubes are welded to the corresponding tube holes of the 11 corresponding tube sheets, or fixed to the corresponding tube holes of the corresponding tube sheets in an expansion manner by the tube expanders to serve as support between the tube sheets. 5. The efficient waste heat recovery setting machine according to claim 3 or 4, wherein after the connecting tube sleeve is fixed to the tube sheet, a connecting end of the connecting tube sleeve and the thin metal tube is located at an inner side of the tube sheet, and the connecting tube sleeve is inserted into or sleeved outside the thin metal tube. 6. The efficient waste heat recovery setting machine according to claim 5, wherein a connecting surface of the connecting tube sleeve for mating with the thin metal tube in an insertion manner is a guide conical surface. 7. The efficient waste heat recovery setting machine according to claim 5, wherein the other end of the connecting tube sleeve comprises a protruding edge, and when the connecting tube sleeve is inserted into the tube hole of the tube sheet, the protruding edge and an outer side of the tube sheet form a limit stop. 8. The efficient waste heat recovery setting machine according to claim 3 or 4, wherein the heat exchange tube is a spiral tube with extruded inner and outer walls, and both ends of the spiral tube are connecting ends without spiral extrusion. 9. The efficient waste heat recovery setting machine according to claim 2, comprising a height-adjustable lifting frame, wherein the heat recovery device comprises a waste heat inlet, a waste heat outlet, a cold air inlet, and a hot air outlet; a ventilation pipe in mating communication with the waste heat inlet, the waste heat outlet, the cold air inlet and the hot air outlet is connected to the lifting frame; and the ventilation pipe comprises a flexible connection section. 10. The efficient waste heat recovery setting machine according to claim 1, wherein an isolation device is arranged between the preheating section and the adjacent setting section, and the isolation device is used to separate remaining space of the oven up and down except for cloth feeding. ABSTRACT OF THE DISCLOSURE Disclosed in the present invention is an efficient waste heat recovery setting machine. The setting machine comprises several heat recovery devices connected in series or in parallel, wherein front N oven sections of an oven body are preheating sections provided with air inlets, and the remaining ovens are divided into several connected setting sections from front to back; each setting section includes one to several oven sections; air outlets of the ovens on each setting section are in communication with one another and are connected to one corresponding heat recovery device; tail gas discharged from the ovens on the setting section enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged; air outlets of the ovens on the preheating sections are in communication with one another and are also connected to one corresponding heat recovery device; tail gas discharged from the ovens on the preheating sections enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged; external air enters the ovens in the preheating sections after being subjected to heat exchange and heating in one or more heat recovery devices. The present invention provides the efficient waste heat recovery setting machine, which can efficiently and flexibly utilize waste heat while reducing discharge waste of heat. I ’Old DRAWINGS 2 / 8 FIG. 2 FIG. 3 FIG. 4 00 m 5 / 8 d E FIG. 6 FIG. 7 FIG. 8 FIG. 9 17 FIG. 10 FIG. 11

Claims

1. An efficient waste heat recovery setting machine, comprising an oven body composed of a plurality of ovens arranged in turn from front to back, wherein each oven is provided with an air outlet; the efficient waste heat recovery setting machine comprises a plurality of heat recovery devices connected in series or in parallel; front N ovens of the oven body are a preheating section provided with air inlets, and the remaining ovens are divided into a plurality of connected setting sections from front to back; each setting section comprises one to multiple ovens; air outlets of the ovens in each setting section are in communication with one another and connected to one corresponding heat recovery device; tail gas discharged from the ovens in the setting section enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged; air outlets of the ovens in the preheating section are in communication with one another and connected to one corresponding heat recovery device; tail gas discharged from the ovens in the preheating section enters the corresponding heat recovery device for heat exchange and cooling, and is then discharged; the heat recovery devices are in communication with the air inlet on the oven of the preheating section, and external air enters the ovens in the preheating section after being subjected to heat exchange and heating in one or more heat recovery devices;wherein the external air passing through the heat recovery devices in communication with the air outlets of the ovens of the preheating section is in communication with the ovens preceding the preheating section, and the external air passing through the heat recovery devices in communication with the ovens of the setting section is in communication with the ovens subsequent to the preheating section;wherein the heat recovery device comprises a base and a plurality of heat exchangers installed on the base, each of the heat exchanger comprises an external housing, and a plurality of heat exchange tubes vertically installed in the housing, and 112023295618   04 Sep 2026the base is internally provided with a channel for communicating the multiple heat exchangers with one another;wherein the tail gas enters the channel of the base through the heat exchange tubes of one of the heat exchangers and is then discharged through the heat exchange tubes of another of the heat exchangers, and the external air enters said other heat exchanger from said one heat exchanger, exchanges heat with the tail gas in the heat exchange tubes within the housing, and then enters the preheating section;wherein a group of tube sheets with uniformly distributed tube holes are installed in the housing of the heat exchanger, the plurality of heat exchange tubes are installed between the two tube sheets and are in communication with the corresponding tube holes, respectively, a part or all of the heat exchange tubes are thin metal tubes with a wall thickness of not more than 1 mm, both ends of the thin metal tube are inserted with connecting tube sleeves, and the connecting tube sleeves at both ends are welded to corresponding tube holes of the corresponding tube sheets, or fixed to the corresponding tube holes of the corresponding tube sheets in an expansion manner by tube expanders;as the thin metal tube is not directly welded or expanded using the tube expander, a situation of burn-through or expansion-splitting is avoided;a plurality of partitions located between the thin metal tubes are installed in the housing, which are configured to guide the medium located outside the thin metal tubes 13 to be conveyed in a serpentine manner;wherein after the connecting tube sleeve is fixed to the tube sheet, a connecting end of the connecting tube sleeve and the thin metal tube is located at an inner side of the tube sheet, and the connecting tube sleeve is inserted into or sleeved outside the thin metal tube;wherein a connecting surface of the connecting tube sleeve for mating with the thin metal tube in an insertion manner is a guide conical surface;wherein the other end of the connecting tube sleeve comprises a protruding edge, and when the connecting tube sleeve is inserted into the tube hole of the tube2023295618   04 Sep 2026sheet, the protruding edge and an outer side of the tube sheet form a limit stop.

2. The efficient waste heat recovery setting machine according to claim 1, wherein a part of the heat exchange tubes are thick metal tubes with a wall thickness of not less than 1.5 mm, and both ends of the thick metal tubes are welded to the corresponding tube holes of the corresponding tube sheets, or fixed to the corresponding tube holes of the corresponding tube sheets in an expansion manner by the tube expanders to serve as support between the tube sheets.

3. The efficient waste heat recovery setting machine according to claim 1 or 2, wherein the heat exchange tube is a spiral tube with extruded inner and outer walls, and both ends of the spiral tube are connecting ends without spiral extrusion.

4. The efficient waste heat recovery setting machine according to claim 1, comprising a height-adjustable lifting frame, wherein the heat recovery device comprises a waste heat inlet, a waste heat outlet, a cold air inlet, and a hot air outlet; a ventilation pipe in mating communication with the waste heat inlet, the waste heat outlet, the cold air inlet and the hot air outlet is connected to the lifting frame; and the ventilation pipe comprises a flexible connection section.

5. The efficient waste heat recovery setting machine according to claim 1, wherein an isolation device is arranged between the preheating section and the adjacent setting section, and the isolation device is used to separate remaining space of the oven up and down except for cloth feeding.

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