Setting machine waste heat recovery system

Abstract

This application discloses a waste heat recovery system for a stenter, including a stenter and at least two waste heat recovery devices connected in series. The stenter includes a stenting section formed by multiple ovens connected in series, and several exhaust ports of the stenting section are connected to exhaust gas manifolds. The exhaust gas manifolds are connected to the waste heat channel of the first waste heat recovery device through exhaust gas inlets, and the waste heat channels of two adjacent waste heat recovery devices are connected through exhaust gas transition pipes. External fresh air is connected to the fresh air channel of the last waste heat recovery device through a fresh air inlet pipe, and the fresh air channels of two adjacent waste heat recovery devices are connected through fresh air transition pipes. The generated waste heat is sequentially passed through plate heat exchangers in multiple waste heat recovery devices connected in series through the exhaust gas manifolds. At the same time, external fresh air is introduced into the fresh air channel from the last waste heat recovery device in the opposite direction and flows sequentially through all waste heat recovery devices, thereby improving the heat exchange efficiency through multiple heat exchange channels and achieving lower temperature discharge.

Description

Technical Field

[0001] This application relates to the technical field of heat exchange systems for stenters, and in particular to a waste heat recovery system for stenters. Background Technology

[0002] A setting machine is a device used for drying and setting fabrics. A setting machine is generally composed of multiple ovens connected in series. The high-temperature exhaust gas generated during operation is input into an exhaust gas treatment device through an exhaust gas pipeline. After treatment, the heat waste that meets the standards is discharged to the outside.

[0003] To save energy and protect the environment, the stenter is connected to a waste heat recovery device. Before entering the exhaust gas treatment device, the waste heat is first introduced into the waste heat recovery device to utilize the heat energy of the waste heat. At the same time, external fresh air is introduced into the waste heat recovery device and heated through heat exchange. The heated fresh air then flows back into the stenter to realize energy utilization.

[0004] Different fabrics require different setting and drying temperatures, which in turn leads to different temperatures of waste heat. Currently, there are no fixed requirements for the temperature of waste heat emissions, but it is clear that the lower the temperature of the waste heat emissions, the better. Current waste heat recovery systems on the market only use a single device to treat the waste heat through heat exchange, resulting in relatively poor heat exchange efficiency; the treated waste heat still retains a considerably high temperature. Utility Model Content

[0005] In order to improve the heat exchange effect of waste heat and reduce the temperature of the discharged waste heat, this application provides a waste heat recovery system for stenter machines.

[0006] The waste heat recovery system for a stenter machine provided in this application adopts the following technical solution:

[0007] A waste heat recovery system for a stenter machine, comprising:

[0008] A setting machine, comprising a setting section formed by multiple ovens connected in series, wherein several exhaust ports of the setting section are connected to exhaust manifolds; and

[0009] At least two waste heat recovery devices connected in series, each waste heat recovery device including a plate heat exchanger having a non-conductive waste heat channel and a fresh air channel.

[0010] The exhaust gas manifold is connected to the waste heat recovery device at the beginning via an exhaust gas inlet pipe. The waste heat recovery devices of two adjacent devices are connected via an exhaust gas transition pipe. External fresh air is connected to the fresh air channel of the waste heat recovery device at the end via a fresh air inlet pipe. The fresh air channels of two adjacent devices are connected via a fresh air transition pipe. The fresh air channel of the waste heat recovery device at the beginning is connected to two fresh air outlet branch pipes, which are connected to the front and rear ends of the shaping section, respectively.

[0011] Preferably, the waste heat recovery device further includes:

[0012] A heat exchange chamber, wherein the heat exchange chamber has a heat exchange cavity and a fresh air inlet and a fresh air outlet communicating with the heat exchange cavity;

[0013] A waste heat inlet box is located above the heat exchange box. The waste heat inlet box has a waste heat inlet that connects to the heat exchange chamber. The waste heat inlet is connected to a first waste gas inlet pipe / a second waste gas inlet pipe.

[0014] A waste heat outlet box is located above the heat exchange chamber, and the waste heat outlet box has a waste heat outlet that communicates with the heat exchange chamber; and

[0015] A transition chamber having a transition cavity connected to a heat exchange chamber;

[0016] The plate heat exchanger is installed inside the heat exchange chamber and has multiple heat exchange units arranged at intervals. The waste heat channel is formed in the heat exchange unit, and the multiple heat exchange units divide the heat exchange chamber to form multiple fresh air channels. The flow direction of the waste heat in the waste heat channel and the flow direction of the fresh air in the fresh air channel form an angle.

[0017] Preferably, the plate heat exchanger includes:

[0018] A first heat exchange module, comprising a plurality of spaced-apart first heat exchange units, each first heat exchange unit having a first waste heat channel connecting a waste heat inlet and a transition cavity; and

[0019] The second heat exchange module includes multiple spaced-apart second heat exchange units. Each second heat exchange unit has a second waste heat channel, which connects the waste heat outlet to the transition cavity.

[0020] Preferably, the first heat exchange module is arranged adjacent to the second heat exchange module, and the first heat exchange units are staggered / overlapped with the second heat exchange units in the direction of fresh air flow.

[0021] Preferably, the waste heat recovery device further includes:

[0022] A waste heat deflector is installed on one side of the waste heat inlet and outlet. The waste heat deflector has waste heat deflection ports, which connect the waste heat inlet and the waste heat channel, and the waste heat outlet and the waste heat channel, respectively.

[0023] A transition guide plate is installed on one side of the transition cavity. The transition guide plate has a transition guide port, which connects the transition cavity and the waste heat channel.

[0024] Preferably, both the fresh air inlet and the fresh air outlet have flared structures, with the diameter of the fresh air inlet gradually increasing from the opening towards the heat exchange chamber, and the diameter of the fresh air outlet gradually decreasing from the heat exchange chamber towards the outlet.

[0025] Preferably, the heat exchange unit includes:

[0026] A first heat exchange plate, the first heat exchange plate including a first heat exchange section and a first connecting section connecting both sides of the first heat exchange section; and

[0027] The second heat exchange plate includes a second heat exchange section and a second connecting section connecting both sides of the second heat exchange section.

[0028] The first heat exchange section and the second heat exchange section each include a plurality of spaced first heat exchange segments and second heat exchange segments. The second heat exchange segment is placed between two adjacent first heat exchange segments. The first heat exchange segment includes a plurality of spaced protrusions, and the second heat exchange segment includes a plurality of spaced concaves. The first heat exchange section and the second heat exchange section have a gap to form the heat waste channel.

[0029] Preferably, the first connecting portion includes a first bent section, the second connecting portion includes a second bent section, and the first bent section abuts against the inner side of the second bent section.

[0030] Preferably, the first bending segment includes a first inclined segment and a second inclined segment with a certain angle; the second bending segment includes a third inclined segment and a fourth inclined segment with a certain angle, the first inclined segment and the third inclined segment abutting each other, and the second inclined segment and the fourth inclined segment abutting each other; the first connecting portion further includes an extension segment connected to the end of the second inclined segment; the second connecting portion further includes a fifth inclined segment connected to the end of the fourth inclined segment, and the extension segment abutting the inner surface of the fifth inclined segment.

[0031] Preferably, the first connecting portion further includes a flange connecting the first heat exchange portion and the first bending section; the second connecting portion further includes a flange extending outward from one end of the second bending section, the flange abutting against the upper end face of the flange.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. All exhaust ports of the styling section are connected through exhaust manifolds, so that all the heat waste of the styling machine can be collected and discharged through the exhaust manifolds. The concentrated heat waste passes through the plate heat exchangers in multiple interconnected waste heat recovery devices in sequence. At the same time, the external fresh air is introduced into the fresh air duct from the end waste heat recovery device in the opposite direction and flows through all the waste heat recovery devices in sequence. In this way, the heat waste can improve the heat exchange effect through multiple heat exchange channels and achieve the discharge at a lower temperature.

[0034] 2. By introducing waste heat downwards into the heat exchange chamber through the waste heat inlet and fresh air into the heat exchange chamber through the fresh air inlet, the fresh air channel and the waste heat channel are arranged to intersect each other to avoid channel interference in the structural design and increase the heat exchange effect. Secondly, by adding a transition box, the waste heat flows through the waste heat channel and then enters the transition box. The transition box acts as a transfer station, and the waste heat turns its flow path when entering the waste heat channel from the transition box, increasing the length of the waste heat path and further improving the heat exchange effect. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the waste heat recovery system of the stenter in Example 1;

[0036] Figure 2 This is a schematic diagram of the waste heat recovery device in Example 1;

[0037] Figure 3 This is a left view of the waste heat recovery device in Example 1;

[0038] Figure 4 This is a schematic diagram of the structure of the first heat exchange unit in Embodiment 1;

[0039] Figure 5 This is an exploded view of the first heat exchange unit in Embodiment 1;

[0040] Figure 6 This is a cross-sectional view of the first heat exchange unit in Embodiment 1;

[0041] Figure 7 This is a schematic diagram showing the connection between the first connecting part and the second connecting part in Embodiment 1;

[0042] Figure 8 The first embodiment mainly shows the structural schematic diagram of the first heat exchange section and the second heat exchange section;

[0043] Figure 9 This is a schematic diagram of the structure of the first heat exchange module in Embodiment 1;

[0044] Figure 10 The first embodiment mainly shows the connection diagram between the first heat exchange module and the waste heat guide plate and the transition guide plate;

[0045] Figure 11 This is a schematic diagram showing the arrangement of the first heat exchange unit and the second heat exchange unit in the overlapping state in Embodiment 1;

[0046] Figure 12 This is a schematic diagram showing the staggered arrangement of the first heat exchange unit and the second heat exchange unit in Embodiment 1.

[0047] Figure 13 This is a schematic diagram of the waste heat recovery device in Example 2.

[0048] Explanation of reference numerals in the attached drawings: 100, Sterilizer; 110, Drying oven; 120, Exhaust gas manifold; 130, Exhaust gas inlet pipe; 140, Exhaust gas transition pipe; 150, Exhaust gas outlet pipe; 160, Fresh air inlet pipe; 170, Fresh air transition pipe; 180, Fresh air outlet branch pipe; 200, Waste heat recovery device; 210, Heat exchange box; 211, Heat exchange chamber; 2111, Fresh air duct; 212, Fresh air inlet; 213, Fresh air outlet. 220. Waste heat inlet box; 221. Waste heat inlet; 230. Waste heat outlet box; 231. Waste heat outlet; 240. Transition box; 241. Transition cavity; 242. Drain outlet; 243. Manhole; 250. Waste heat guide plate; 251. Waste heat guide port; 260. First heat exchange module; 261. First heat exchange unit; 262. First heat exchange plate; 2621. First heat exchange section; 2622. First connecting part; 26221, flange; 26222, first inclined section; 26223, second inclined section; 26224, extension section; 263, second heat exchange plate; 2631, second heat exchange part; 2632, second connecting part; 26321, folded edge; 26322, third inclined section; 26323, fourth inclined section; 26324, fifth inclined section; 26325, adjusting section; 264, first heat waste Channel; 265, First heat exchange section; 2651, Protrusion; 2652, First arc-shaped section; 266, Second heat exchange section; 2661, Recess; 2662, Second arc-shaped section; 270, Second heat exchange module; 271, Second heat exchange unit; 280, Transition guide plate; 281, Transition guide port; 280, Third heat exchange module; 290, Fourth heat exchange module; 300, Exhaust fan; 400, Exhaust fan. Detailed Implementation

[0049] The present application will be further described in detail below with reference to the accompanying drawings.

[0050] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Example 1

[0052] Figure 1 A parallel heat recovery system for a stenter is shown, including a stenter 100 and at least two heat recovery devices 200 connected in series. The stenter 100 includes a stenting section formed by multiple ovens 110 connected in series. In this embodiment, two heat recovery devices 200 connected in series are used as an example. Of course, three, four or even more devices can be connected in series to improve the heat exchange effect on waste heat.

[0053] Several exhaust ports of the shaping section are connected to an exhaust manifold 120, which can collect the heat waste generated by the shaping section. The waste heat recovery device 200 includes a plate heat exchanger, which has heat exchange units arranged at intervals. Each heat exchange unit has a heat waste passage, and multiple heat exchange units are arranged at intervals within the waste heat recovery device 200 to form a fresh air passage 2111. The heat waste passage and the fresh air passage 2111 are not interconnected.

[0054] The exhaust gas manifold 120 is connected to the waste heat recovery device 200 at the first end via an exhaust gas inlet pipe 130. The waste heat recovery devices 200 at the second end are connected via an exhaust gas transition pipe 140. The waste heat recovery device 200 at the third end is connected to an exhaust fan 300 via an exhaust gas outlet pipe 150. The exhaust fan 300 discharges the waste heat to the exhaust gas treatment device at the next end.

[0055] External fresh air is connected to the fresh air duct 2111 of the waste heat recovery device 200 at the end via a fresh air inlet duct 160. The fresh air inlet duct 160 is connected to an induced draft fan 400 to provide power. The fresh air ducts 2111 of two adjacent waste heat recovery devices 200 are connected via a fresh air transition duct 170. The fresh air duct 2111 of the first waste heat recovery device 200 is connected to two fresh air outlet branch pipes 180, which are respectively connected to the front and rear ends of the shaping section. The front end of the shaping section is defined as the first or second section of the drying oven 110; the rear end of the shaping section is defined as the last or second-to-last section of the drying oven 110. Waste heat is effectively cooled through heat exchange after passing through multiple waste heat recovery devices 200.

[0056] See also Figure 2 and Figure 3 The waste heat recovery device 200 includes a heat exchange chamber 210 and a waste heat inlet chamber 220, a waste heat outlet chamber 230, and a transition chamber 240 connected to the heat exchange chamber 210. The waste heat inlet chamber 220 and the waste heat outlet chamber 230 are connected above the heat exchange chamber 210, and the transition chamber 240 is connected below the heat exchange chamber 210. This device can be installed on one side or the top of the stenter 100. In this embodiment, it is installed horizontally on the top of the stenter 100.

[0057] The heat exchange chamber 210 has a heat exchange cavity 211 inside. The heat exchange chamber 210 has a fresh air inlet 212 and a fresh air outlet 213 on its two sides, respectively, which are connected to the heat exchange cavity 211. Both the fresh air inlet and the fresh air outlet 213 are designed with flared openings. The diameter of the fresh air inlet 212 gradually increases from the opening towards the heat exchange cavity 211 to increase the airflow rate; the diameter of the fresh air outlet 213 gradually decreases from the heat exchange cavity 211 towards the outlet to maximize the outlet velocity.

[0058] A waste heat inlet 221 is provided on one side of the waste heat inlet box 220, and a waste heat outlet 231 is provided on one side of the waste heat outlet box 230. Both the waste heat inlet 221 and the waste heat outlet 231 are connected to the heat exchange chamber 211. The transition box 240 includes a transition chamber 241, which is connected to the heat exchange chamber 211.

[0059] The aforementioned plate heat exchanger is installed in the heat exchange chamber 211. The plate heat exchanger includes a first heat exchange module 260 and a second heat exchange module 270 arranged adjacent to each other. Waste heat is introduced from the waste heat inlet 221, passes through the first heat exchange module 260 into the transition chamber 241, then flows from the transition chamber 241 into the second heat exchange module 270, and finally exits from the waste heat outlet 231. Fresh air is introduced from the fresh air inlet 212 into the heat exchange chamber 211, passes through the first heat exchange module 260 and the second heat exchange module 270, and exits from the fresh air outlet 213.

[0060] See also Figures 4 to 6 Both the first heat exchange module 260 and the second heat exchange module 270 contain multiple heat exchange units with identical structures. This embodiment uses the structure of the first heat exchange unit 261 as an example for explanation. The first heat exchange unit 261 includes a first heat exchange plate 262 and a second heat exchange plate 263 connected to each other. Both are sheet metal structures, formed by processes such as stamping and bending. The first heat exchange plate 262 includes a first heat exchange part 2621 and a first connecting part 2622 connected to both sides of the first heat exchange part 2621. The second heat exchange plate 263 includes a second heat exchange part 2631 and a second connecting part 2632 connected to both sides of the second heat exchange part 2631. The connection between the first connecting part 2622 and the second connecting part 2632 realizes the connection between the first heat exchange plate 262 and the second heat exchange plate 263.

[0061] Combination Figure 7 The first connecting portion 2622 includes a flange 26221 connecting to one side of the first heat exchange portion 2621, a first bent section connecting the flange 26221, and an extension section 26224 connecting the first bent section. The first bent section includes a first inclined section 26222 and a second inclined section 26223 at a certain angle, and the extension section 26224 connects to one end of the second inclined section 26223, and the two also form a certain angle.

[0062] The second connecting portion 2632 includes a second bent section, a folded edge 26321 connecting the two ends of the second bent section, a fifth inclined section 26324, and an adjusting section 26325 connecting the fifth inclined section 26324. One end of the adjusting section 26325 is connected to the second heat exchange portion 2631. The second bent section includes a third inclined section 26322 and a fourth inclined section 26323 at a certain angle. One end of the fourth inclined section 26323 is connected to the fifth inclined section 26324, and the two also form a certain angle.

[0063] When the first connecting part 2622 and the second connecting part 2632 cooperate with each other, the first bent section abuts against the second bent section, and further, the inner surface of the first inclined section 26222 abuts against the inner surface of the third inclined section 26322, and the inner surface of the second inclined section 26223 abuts against the inner surface of the fourth inclined section 26323. At the same time, the inner surface of the extension section 26224 abuts against the inner surface of the fifth inclined section 26324, thereby realizing the guiding connection between the first connecting part 2622 and the second connecting part 2632. When connecting the first heat exchange plate 262 and the second heat exchange plate 263, one of the heat exchange plates can be guided and inserted from one end of the other heat exchange plate, and the two can slide together to achieve rapid connection and positioning.

[0064] Meanwhile, the flange 26221 and the folded edge 26321 abut against each other, and the two are connected by welding or fasteners to finally achieve the connection and fixation of the first heat exchange plate 262 and the second heat exchange plate 263. In this embodiment, the flange 26221 is a double-layer structure, which forms a triple-layer structure after abutting with the folded edge 26321. Compared with the existing two flanges 26321 abutting connection, it is better in terms of support strength and stability after connection.

[0065] Furthermore, the contact between the first and second bending sections, combined with the contact between the extension section 26224 and the fifth inclined section 26324, creates a labyrinthine-like sealing structure at the connection between the first connecting part 2622 and the second connecting part 2632. A certain distance exists between the first heat exchange part 2621 and the second heat exchange part 2631, forming a first waste heat channel 264 for the flow of heating waste gas. The labyrinthine-like sealing structure formed on both sides of the first waste heat channel 264 improves the sealing performance during waste heat flow, reducing the possibility of waste heat overflow. Additionally, the adjusting section 26325 has a vertical section at one end, the height of which can be adjusted according to the flow rate of waste heat, thereby changing the height of the first waste heat channel 264.

[0066] See Figure 8 Both the first heat exchange section 2621 and the second heat exchange section 2631 include a plurality of first heat exchange segments 265 and second heat exchange segments 266 arranged at intervals. The first heat exchange segment 265 includes a plurality of protrusions 2651 arranged at intervals, and adjacent protrusions 2651 are connected by a first arc-shaped segment 2652.

[0067] The second heat exchange section 266 includes a plurality of recesses 2661 arranged at intervals, and adjacent recesses 2661 are connected by a second arc-shaped section 2662; the first arc-shaped section 2652 protrudes towards the side of the first waste heat channel 264, and the second arc-shaped section 2662 protrudes away from the first waste heat channel 264, thereby both the first heat exchange section 2621 and the second heat exchange section 2631 have a heat exchange structure with a similar wave shape to increase the heat exchange area.

[0068] See also Figure 9 and Figure 10 The device also includes a waste heat guide plate 250 installed on one side of the waste heat inlet 221 and the waste heat outlet 231, and a transition guide plate 280 installed on one side of the transition cavity 241. The waste heat guide plate 250 has a waste heat guide port 251 for connecting the waste heat inlet 221 with a plurality of waste heat channels; the transition guide plate 280 has a transition guide port 281 for connecting the first transition cavity 241 with a plurality of first waste heat channels 264. Thus, after entering from the waste heat inlet 221, the waste heat can enter the first waste heat channels 264 of a plurality of first heat exchange units 261 through the multiple waste heat guide ports 251, enter the transition cavity 241 through the corresponding transition guide port 281, and enter the second waste heat channel of the corresponding second heat exchange unit 271 through the transition guide port 281 on one side, and finally enter the waste heat outlet 231 through the waste heat guide port 251 on one side to achieve an S-shaped path flow.

[0069] There is a certain distance between two adjacent first heat exchange units 261. After several first heat exchange units 261 are installed in the heat exchange chamber 211, the heat exchange chamber 211 is divided to form multiple fresh air channels 2111. The fresh air inlet 212 and the fresh air outlet 213 are connected to the fresh air channels 2111. At the same time, the flow direction of fresh air in the fresh air channels 2111 intersects with the flow direction of waste heat in the first waste heat channel 264 and the second waste heat channel at a certain angle. In this embodiment, the flow direction of fresh air is perpendicular to the flow direction of waste heat to maximize the heat exchange effect.

[0070] Combination Figure 11 and Figure 12 Several first heat exchange units 261 are interconnected by a frame. Since the first heat exchange module 260 and the second heat exchange module 270 are arranged adjacent to each other, the several first heat exchange units 261 and the several second heat exchange units 271 can overlap or be staggered along the direction of fresh air flow. When several first heat exchange units 261 and several second heat exchange units 271 are arranged overlapping each other, the flow of fresh air in the fresh air channel 2111 is less interfered with by the second heat exchange units 271. In this scenario, the time required for fresh air to travel from the fresh air inlet 212 to the fresh air outlet 213 is shorter, which can be applied to the drying and setting environment of fabrics with low temperatures. However, when several first heat exchange units 261 and several second heat exchange units 271 are arranged staggered, the flow of fresh air in the fresh air channel 2111 is more interfered with by the second heat exchange units 271. The interference from the second heat exchange units 271 will be diverted to improve the heat exchange effect. In this scenario, the time required for fresh air to travel from the fresh air inlet 212 to the fresh air outlet 213 is longer, which can be applied to the drying and setting environment of fabrics with higher temperatures. Example 2

[0071] Figure 13 Another structure of the waste heat recovery device 200 is shown, in which the number of transition boxes 240 is increased. Specifically, in this embodiment, three transition boxes 240 are arranged vertically and staggered from each other. Meanwhile, the heat exchanger in the heat exchange chamber 211 also includes a third heat exchange module 280 and a fourth heat exchange module 290. The first heat exchange module 260, the second heat exchange module 270, the third heat exchange module 280, and the fourth heat exchange module 290 have the same structure, and the third heat exchange module 280 and the fourth heat exchange module 290 are arranged adjacent to each other.

[0072] After being introduced through the waste heat inlet 221, the waste heat flows sequentially through the first heat exchange module 260, the first transition chamber 241, the second heat exchange module 270, the second transition chamber 241, the third heat exchange module 280, the third transition chamber 241, and the fourth heat exchange module 290 before being discharged through the waste heat outlet 231. This increases the flow path length of the waste heat within the waste heat recovery device 200. More transition chambers 240 can be added, depending on installation size requirements and heat exchange efficiency. In this embodiment, each transition chamber 241 is also guided by a transition guide plate 280.

[0073] The third heat exchange module 280 and the fourth heat exchange module 290 each have several third heat exchange units and fourth heat exchange units with the same structure. The several third heat exchange units and fourth heat exchange units can be arranged to overlap or stagger along the direction of fresh air flow. Combined with the arrangement of several first heat exchange units 261 and several second heat exchange units 271, more paths of fresh air flow can be formed to suit different fabric production needs.

[0074] In addition, in Embodiment 1 and Embodiment 2, each transition box 240 is provided with a drain outlet 242 and a manhole 243. After the device has been used for a period of time, the water accumulated in the transition cavity 241 can be discharged through the drain outlet 242, and the operator can enter the transition cavity 241 through the manhole 243 to perform maintenance operations such as cleaning large particles of impurities.

[0075] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A setting machine waste heat recovery system characterized by, include: A setting machine (100) comprising a setting section formed by multiple ovens (110) connected in series, wherein several exhaust ports of the setting section are connected to exhaust manifolds (120); and At least two waste heat recovery devices (200) connected in series, each including a plate heat exchanger having a non-conductive waste heat channel and a fresh air channel (2111). The exhaust gas manifold (120) is connected to the waste heat channel of the first end waste heat recovery device (200) through the exhaust gas inlet pipe (130). The waste heat channels of two adjacent waste heat recovery devices (200) are connected through the exhaust gas transition pipe (140). The external fresh air is connected to the fresh air channel (2111) of the last end waste heat recovery device (200) through the fresh air inlet pipe (160). The fresh air channels (2111) of two adjacent waste heat recovery devices (200) are connected through the fresh air transition pipe (170). The fresh air channel (2111) of the first end waste heat recovery device (200) is connected to two fresh air outlet branch pipes (180) respectively. The two fresh air outlet branch pipes (180) are connected to the front end and the rear end of the shaping section respectively.

2. The setting machine waste heat recovery system according to claim 1, characterized by, The waste heat recovery device (200) further includes: The heat exchange box (210) has a heat exchange chamber (211) and a fresh air inlet (212) and a fresh air outlet (213) communicating with the heat exchange chamber (211). A waste heat inlet box (220) is located above the heat exchange box (210). The waste heat inlet box (220) has a waste heat inlet (221) that connects to the heat exchange chamber (211). The waste heat inlet (221) is connected to the first waste gas inlet pipe (130) / the second waste gas inlet pipe (130). A waste heat outlet box (230) is located above the heat exchange chamber (210), and the waste heat outlet box (230) has a waste heat outlet (231) that communicates with the heat exchange chamber (211); and Transition box (240), the transition box (240) having a transition cavity (241) communicating with the heat exchange cavity (211); The plate heat exchanger is installed in the heat exchange chamber (211). The plate heat exchanger has multiple heat exchange units arranged at intervals. The waste heat channel is formed in the heat exchange unit. The multiple heat exchange units divide the heat exchange chamber (211) to form multiple fresh air channels (2111). The flow direction of the waste heat in the waste heat channel and the flow direction of the fresh air in the fresh air channel (2111) have an angle.

3. The system for recovering waste heat from a shapemeter according to claim 2, wherein The plate heat exchanger includes: A first heat exchange module (260) includes a plurality of spaced-apart first heat exchange units (261), each first heat exchange unit (261) having a first waste heat channel (264) connecting a waste heat inlet (221) to a transition cavity (241); and The second heat exchange module (270) includes a plurality of second heat exchange units (271) arranged at intervals. The second heat exchange unit (271) has a second waste heat channel, which connects the waste heat outlet (231) and the transition cavity (241).

4. The system for recovering waste heat from a shapemeter according to claim 3, wherein The first heat exchange module (260) is arranged adjacent to the second heat exchange module (270), and a plurality of first heat exchange units (261) are staggered / overlapped with a plurality of second heat exchange units (271) in the direction of fresh air flow.

5. The setting machine waste heat recovery system according to claim 2, wherein The waste heat recovery device (200) further includes: A waste heat guide plate (250) is installed on one side of the waste heat inlet (221) and the waste heat outlet (231). The waste heat guide plate (250) has a waste heat guide port (251), which connects the waste heat inlet (221) to the waste heat channel and the waste heat outlet (231) to the waste heat channel. A transition guide plate (280) is installed on one side of the transition cavity (241). The transition guide plate (280) has a transition guide port (281) which connects the transition cavity (241) with the waste heat channel.

6. The setting machine waste heat recovery system according to claim 2, wherein Both the fresh air inlet (212) and the fresh air outlet (213) are flared structures. The diameter of the fresh air inlet (212) gradually increases from the opening towards the heat exchange chamber (211), and the diameter of the fresh air outlet (213) gradually decreases from the heat exchange chamber (211) towards the outlet.

7. The setting machine waste heat recovery system according to claim 2, wherein The heat exchange unit includes: A first heat exchange plate (262) includes a first heat exchange section (2621) and first connecting sections (2622) connected to both sides of the first heat exchange section (2621); and The second heat exchange plate (263) includes a second heat exchange section (2631) and a second connecting section (2632) connected to both sides of the second heat exchange section (2631). The first heat exchange section (2621) and the second heat exchange section (2631) each include a plurality of spaced first heat exchange segments (265) and second heat exchange segments (266). The second heat exchange segment (266) is placed between two adjacent first heat exchange segments (265). The first heat exchange segment (265) includes a plurality of spaced protrusions (2651), and the second heat exchange segment (266) includes a plurality of spaced concave portions (2661). The first heat exchange section (2621) and the second heat exchange section (2631) have a gap to form the heat waste channel.

8. The system for recovering waste heat from a shap ing machine according to claim 7, wherein The first connecting portion (2622) includes a first bent section, and the second connecting portion (2632) includes a second bent section, wherein the first bent section abuts against the inner side of the second bent section.

9. The system for recovering waste heat from a shapemeter according to claim 8, wherein The first bending segment includes a first inclined segment (26222) and a second inclined segment (26223) with a certain angle; the second bending segment includes a third inclined segment (26322) and a fourth inclined segment (26323) with a certain angle, the first inclined segment (26222) and the third inclined segment (26322) abutting each other, and the second inclined segment (26223) and the fourth inclined segment (26323) abutting each other; the first connecting portion (2622) further includes an extension segment (26224) connected to the end of the second inclined segment (26223); the second connecting portion (2632) further includes a fifth inclined segment (26324) connected to the end of the fourth inclined segment (26323), and the extension segment (26224) abuts against the inner surface of the fifth inclined segment (26324).

10. The system for recovering waste heat from a shapemeter according to claim 8, wherein The first connecting part (2622) further includes a flange (26221) connecting the first heat exchange part (2621) and the first bending section; the second connecting part (2632) further includes a flange (26321) extending outward from one end of the second bending section, the flange (26221) abutting against the upper end face of the flange (26321).

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