Parallel type setting machine waste heat recovery system

Abstract

The application discloses a parallel type setting machine waste heat recovery system, which comprises a setting machine, a first waste heat recovery device and a second waste heat recovery device. The setting machine comprises a front setting section and a rear setting section. The front setting section is connected with a first waste gas pipeline, and the rear setting section is connected with a second waste gas pipeline. The fresh air channels of the first waste heat recovery device and the second waste heat recovery device are respectively connected with the air inlet of the front setting section and the air inlet of the rear setting section through a first fresh air outlet pipe and a second fresh air outlet pipe. Since the temperatures of the front waste heat and the rear waste heat are different, the temperatures of the heated fresh air are also different. The fresh air heated by the front waste heat is introduced into the front setting section, and the fresh air heated by the rear waste heat is introduced into the rear setting section, so that the conversion of different waste heat energies can be reasonably utilized.

Description

Technical Field

[0001] This application relates to the technical field of waste heat recovery systems for stenters, and in particular to a parallel 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] Currently, waste heat recovery systems on the market introduce all the exhaust gas from the stenter into the waste heat recovery device. The temperature of the mixed waste heat is constant, which generally leads to a fixed temperature after the fresh air is heated. However, since the waste heat generated in different ovens has different temperatures, the heat energy conversion caused by the different waste heat temperatures due to the different oven temperatures cannot be reasonably utilized after all of them are discharged in a unified manner. Utility Model Content

[0005] In order to make reasonable use of the waste heat energy generated by the ovens in different working sections, this application provides a parallel-connected waste heat recovery system for a stenter.

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

[0007] A parallel-type waste heat recovery system for a stenter includes:

[0008] A setting machine, comprising a setting section formed by multiple ovens connected in series, the setting section comprising a front setting section connected from the first oven to the middle oven and a rear setting section connected from the remaining ovens, wherein a number of exhaust ports of the front setting section are connected to a first exhaust pipe and a number of exhaust ports of the rear setting section are connected to a second exhaust pipe.

[0009] First waste heat recovery device; and

[0010] The second waste heat recovery device has the same structure as the first waste heat recovery device, both including a plate heat exchanger. The plate heat exchanger has non-conductive waste heat channels and fresh air channels.

[0011] The first exhaust gas pipeline is connected to the waste heat channel of the first waste heat recovery device through the first exhaust gas inlet pipe, and the second exhaust gas pipeline is connected to the waste heat channel of the second waste heat recovery device through the second exhaust gas inlet pipe. External fresh air is connected to the fresh air channel of the first waste heat recovery device through the first fresh air inlet pipe and to the fresh air channel of the second waste heat recovery device through the second fresh air inlet pipe. The fresh air channels of the first and second waste heat recovery devices are also connected to the air inlet of the front shaping section and the air inlet of the rear shaping section through the first and second fresh air outlet pipes, respectively.

[0012] Preferably, the first waste heat recovery device and the second waste heat recovery device further include:

[0013] 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;

[0014] 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.

[0015] 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

[0016] A transition chamber having a transition cavity connected to a heat exchange chamber;

[0017] 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.

[0018] Preferably, the plate heat exchanger includes:

[0019] 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

[0020] 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.

[0021] 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.

[0022] Preferably, the first waste heat recovery device and the second waste heat recovery device further include:

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Preferably, the heat exchange unit includes:

[0027] 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

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. The front-stage and rear-stage waste heat from the stenter are collected through the first and second waste gas pipes and then introduced into the first and second waste heat recovery devices respectively to exchange heat with the external fresh air. Since the temperatures of the front-stage and rear-stage waste heat are different, the temperature of the heated fresh air is also different. The fresh air heated by the front-stage waste heat is introduced into the front-stage stenter section, and the fresh air heated by the rear-stage waste heat is introduced into the rear-stage stenter section, which can make reasonable use of the conversion of heat energy from different waste heat.

[0033] 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 duct and waste heat duct are arranged to intersect each other to avoid interference in the structural design and increase the heat exchange effect. Secondly, by adding a transition chamber, the waste heat flows through the waste heat duct and then enters the transition chamber. The transition chamber acts as a transfer station, and the waste heat turns its path as it enters the waste heat duct from the transition chamber, increasing the length of the waste heat path and further improving the heat exchange effect.

[0034] 3. When the first heat exchange plate is connected to the second heat exchange plate, the guiding and positioning connection structure of the first bending section and the second bending section not only facilitates the quick connection and positioning of the two first heat exchange plates and the second heat exchange plate, but also forms a labyrinth-like seal structure, which can improve the sealing performance of the waste heat channel and reduce the leakage of waste heat and the mixing of it with fresh air. Attached Figure Description

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

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

[0037] Figure 3 This is a left view of the first waste heat recovery device in Embodiment 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 11This 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 first waste heat recovery device in Example 2.

[0048] Explanation of reference numerals in the attached drawings: 100, Sterilizer; 110, Oven; 120, First exhaust gas duct; 130, Second exhaust gas duct; 140, First exhaust gas inlet pipe; 150, Second exhaust gas inlet pipe; 160, First fresh air inlet pipe; 170, Second fresh air inlet pipe; 180, First fresh air outlet pipe; 190, Second fresh air outlet pipe; 200, First waste heat recovery device; 210, Heat exchange chamber; 211, Heat exchange cavity; 2111, Fresh air duct; 212 213. Fresh air inlet; 220. Fresh air outlet; 221. Waste heat inlet box; 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, Flanged edge; 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 waste heat channel; 2 65. 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. Second waste heat recovery device; 400. Exhaust fan; 500. 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 waste heat recovery system for a stenter is shown, including a stenter 100, a first waste heat recovery device 200, and a second waste heat recovery device 300. The stenter 100 includes a stenting section formed by multiple ovens 110 connected in series, comprising a front stenting section and a rear stenting section. The front stenting section is defined as the section connecting to the middle section of the first oven, and the rear stenting section is the section connecting to the remaining ovens. The number of sections in the middle section is defined as follows: when the total number of ovens is odd, it is either the middle section or the ovens on either side of the middle section. For example, when the total number of ovens 110 is 7, the middle section is the 4th section or the adjacent 3rd and 5th sections; when the total number of ovens 110 is even, it is either one of the two middle sections. For example, when the total number of ovens 110 is 8, the middle section is either the 4th or 5th section.

[0053] Several exhaust ports of the front shaping section are connected to a first exhaust gas pipe 120, and several exhaust ports of the rear shaping section are connected to a second exhaust gas pipe 130. The first exhaust gas pipe 120 is connected to a first waste heat recovery device 200, and the second exhaust gas pipe 130 is connected to a second waste heat recovery device 300. The first waste heat recovery device 200 is used to convert the heat energy generated by the waste heat from the front shaping section, and the second waste heat recovery device 300 is used to convert the heat energy generated by the waste heat from the rear shaping section.

[0054] Both the first waste heat recovery device 200 and the second waste heat recovery device 300 include plate heat exchangers. The plate heat exchangers have heat exchange units arranged at intervals. Each heat exchange unit has a waste heat channel. Multiple heat exchange units are arranged at intervals within the first waste heat recovery device 200 and the second waste heat recovery device 300 to form a fresh air channel 2111. The waste heat channel and the fresh air channel 2111 are not interconnected.

[0055] The first exhaust gas pipe 120 is connected to the second waste channel 150 of the first waste heat recovery device 200 through the first exhaust gas inlet pipe 140, and the second exhaust gas pipe 130 is connected to the hot waste channel of the second waste heat recovery device 300 through the second exhaust gas inlet pipe 150; the hot waste channel of the first waste heat recovery device 200 and the hot waste channel of the second waste heat recovery device 300 are both discharged to the downstream exhaust gas treatment device through the exhaust fan 400.

[0056] External fresh air is connected to the fresh air duct 2111 of the first waste heat recovery device 200 through the first fresh air inlet pipe 160, and to the fresh air duct 2111 of the second waste heat recovery device 300 through the second fresh air inlet pipe 170. Both the first fresh air inlet pipe 160 and the second fresh air inlet pipe 170 are connected to an induced draft fan 500 to introduce external fresh air. In addition, the fresh air duct 2111 of the first waste heat recovery device 200 is connected to the air inlet of the front shaping section through the first fresh air outlet pipe 180. The air inlet of the front shaping section is located at the first or second oven section, and is located at the front end of the shaping machine 100. The fresh air duct 2111 of the second waste heat recovery device 300 is connected to the air inlet of the rear shaping section through the second fresh air outlet pipe 190. The air inlet of the rear shaping section is located at the last or second-to-last oven section, and is located at the rear end of the shaping machine 100.

[0057] See also Figure 2 and Figure 3 The first waste heat recovery device 200 and the second waste heat recovery device 300 have the same structure. This embodiment will be described using the structure of the first waste heat recovery device 200 as an example. The first waste heat recovery device 200 includes a heat exchange box 210 and a waste heat inlet box 220, a waste heat outlet box 230, and a transition box 240 connected to the heat exchange box 210. The waste heat inlet box 220 and the waste heat outlet box 230 are connected to the top of the heat exchange box 210, and the transition box 240 is connected to the bottom of the heat exchange box 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Combination Figure 7The 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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

[0072] Figure 13 Another structure of the first 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.

[0073] 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 first 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.

[0074] 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.

[0075] 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.

[0076] 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 parallel-type waste heat recovery system for a stenter, characterized in that, include: A setting machine (100) includes a setting section formed by connecting multiple ovens (110) in series. The setting section includes a front setting section connected by the first oven (110) to the middle oven (110) and a rear setting section connected by the remaining ovens (110). A number of exhaust ports of the front setting section are connected to a first exhaust pipe (120), and a number of exhaust ports of the rear setting section are connected to a second exhaust pipe (130). First waste heat recovery device (200); and The second waste heat recovery device (300) has the same structure as the first waste heat recovery device (200), both including a plate heat exchanger, which has a non-conductive waste heat channel and a fresh air channel (2111). The first exhaust gas pipe (120) is connected to the heat waste channel of the first waste heat recovery device (200) through the first exhaust gas inlet pipe (140), and the second exhaust gas pipe (130) is connected to the heat waste channel of the second waste heat recovery device (300) through the second exhaust gas inlet pipe (150). External fresh air is connected to the fresh air channel (2111) of the first waste heat recovery device (200) through the first fresh air inlet pipe (160) and to the fresh air channel (2111) of the second waste heat recovery device (300) through the second fresh air inlet pipe (170). The fresh air channels (2111) of the first waste heat recovery device (200) and the second waste heat recovery device (300) are also connected to the air inlet of the front shaping section and the air inlet of the rear shaping section through the first fresh air outlet pipe (180) and the second fresh air outlet pipe (190), respectively.

2. The parallel-type waste heat recovery system for a stenter according to claim 1, characterized in that, The first waste heat recovery device (200) and the second waste heat recovery device (300) further include: 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 (140) / the second waste gas inlet pipe (150). 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 parallel-type waste heat recovery system for a stenter according to claim 2, characterized in that, 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 parallel-type waste heat recovery system for a stenter according to claim 3, characterized in that, 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. A parallel-type waste heat recovery system for a stenter according to claim 2, characterized in that, The first waste heat recovery device (200) and the second waste heat recovery device (300) further include: 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. A parallel-type waste heat recovery system for a stenter according to claim 2, characterized in that, 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. A parallel-type waste heat recovery system for a stenter according to claim 2, characterized in that, 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. A parallel-type waste heat recovery system for a stenter according to claim 7, characterized in that, 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.

Images