Heat recovery device and foaming furnace

Abstract

The present invention discloses a heat recovery device and a foaming furnace, which are applied to a foaming furnace with a flue for discharging high-temperature exhaust gas. The heat recovery device includes a preheating component, a heat exchanger, and a circulation component. The heat exchanger is arranged in the flue. A heat transfer fluid circulates in the heat exchanger and exchanges heat with the high-temperature exhaust gas. The heat exchanger is provided with a waste residue treatment device. A heated heat transfer fluid circulates in the preheating component, and the preheating component is used to preheat the sheet material. The circulation component connects the heat exchanger and the preheating component respectively, and drives the heat transfer fluid to circulate between the heat exchanger and the preheating component. High-temperature air flows through the heat exchanger to heat the heat transfer fluid. The circulation component sends the heat transfer fluid to the preheating component and transfers the heat to the sheet material. At the same time, the cooled heat transfer fluid is sent back to the heat exchanger, effectively utilizing the heat in the oil smoke. The waste residue treatment device purifies the oil smoke waste residue condensed on the heat exchanger, reduces the pressure of the subsequent exhaust gas treatment device, and prevents the heat exchanger from scaling too thickly and reducing the heat exchange capacity.

Description

Technical Field

[0001] The present invention relates to the field of automated production equipment, in particular to a heat recovery device and a foaming furnace. Background Art

[0002] Foaming furnaces are key equipment in foam production. They can be categorized by structure as vertical or horizontal, and by heating method as electric or gas. For example, in the PE foam production process, PE sheets containing a blowing agent are heated in the foaming furnace, where the agent decomposes at high temperatures to form PE foam. This process generates a large amount of exhaust gas containing oil smoke, which must be promptly discharged. If this exhaust gas remains in the furnace, it will condense on the inner walls, causing oil dripping over time, contaminating the foam and rendering it useless. Because the exhaust gas contains oil smoke, this high-temperature gas cannot be directly used to preheat the PE sheet. Instead, an exhaust vent is typically designed at the furnace mouth, where a fan draws the gas to an exhaust treatment tower before discharging it to the atmosphere. This dissipates a significant amount of heat energy directly with the exhaust gas, resulting in very high energy consumption. At the same time, the oil smoke in the exhaust gas condenses in the exhaust gas treatment tower to produce a large amount of waste residue, which requires frequent shutdown for treatment. The waste residue is fished out and handled by a specialized solid waste treatment company. Because the waste residue contains water, its weight increases greatly, further increasing the treatment cost. Summary of the Invention

[0003] The main purpose of the present invention is to provide a heat recovery device and a foaming furnace, aiming to solve the technical problems of high energy consumption, large amount of solid waste and frequent treatment of the current foaming furnace.

[0004] To achieve the above-mentioned purpose, the present invention proposes a heat recovery device, which is applied to a foaming furnace, and the foaming furnace has a flue for discharging high-temperature exhaust gas; the heat recovery device includes a preheating component, a heat exchanger and a circulation component, the heat exchanger is arranged in the flue, and a heat transfer fluid flows in the heat exchanger and exchanges heat with the high-temperature exhaust gas, and the heat exchanger is provided with a waste residue treatment device, and the waste residue treatment device is used to treat the oil fume lumps condensed on the heat exchanger by the high-temperature exhaust gas; the heated heat transfer fluid flows in the preheating component, and the preheating component is used to preheat the sheet; the circulation component is connected to the heat exchanger and the preheating component respectively, and drives the heat transfer fluid to circulate between the heat exchanger and the preheating component.

[0005] In one embodiment, the preheating assembly includes a first pipe and a roller assembly; the first pipe is passed through the roller assembly, and the roller assembly includes a plurality of rollers and a plurality of fixed pipes, and the plurality of rollers are rotatably arranged side by side and at intervals, and a feed channel for winding and conveying sheets is formed between the plurality of rollers; a fixed pipe is passed through the axial direction of each roller, and the first pipe is passed through the fixed pipe, and the heat transfer fluid flows through the first pipe.

[0006] In one embodiment, the feed channel has a feed end and a discharge end, and the preheating assembly further includes a first drive device connected to the roller assembly, and the first drive device drives the roller assembly to move the sheet from the feed end to the discharge end.

[0007] In one embodiment, the first driving device includes a plurality of first sprockets, a first chain and a first motor; each first sprocket is provided at one end of a fixed tube, the first chain is S-shapedly meshed and connected to every two adjacent first sprockets, the driving end of the first motor is provided with a driving wheel meshed with the first chain, the first motor drives the driving wheel to drive the first chain to rotate, thereby driving the plurality of first sprockets and the plurality of rollers to rotate simultaneously.

[0008] In one embodiment, the heat exchanger includes a plurality of second pipes arranged in a matrix, the plurality of second pipes are interconnected and the heat transfer fluid flows therethrough; the waste residue treatment device includes a second driving device, a push plate and a plurality of pipe brushes provided on the push plate, each of the second pipes passes through the push plate, each of the pipe brushes can be movably mounted outside a second pipe, the second driving device is connected to the push plate, and drives the push plate to drive the pipe brush to reciprocate along the second pipe.

[0009] In one embodiment, the second driving device includes at least two screw rods, at least two second sprockets, a second chain and a second motor, each of the second sprockets is sleeved on one of the screw rods, the second chain is meshedly connected with each of the second sprockets, the driving end of the second motor is connected to any one of the screw rods and drives the second chain to rotate, and the second chain drives the remaining screw rods to rotate to move the push plate.

[0010] In one embodiment, the heat exchanger further includes two side plates that are opposite and spaced apart, the two ends of the plurality of second pipes are respectively passed through the two side plates, and the push plate is located between the two side plates; the two ends of the screw rod are respectively fixed to the two side plates, and the screw rod is connected to the push plate.

[0011] In one embodiment, the number of the push plate is one, and the plurality of duct brushes are fixed on the push plate and move with the push plate; or, the number of the push plate and the second driving device are both two, and the two push plates are respectively arranged on both sides of the duct brush, and the two second driving devices are each connected to one push plate.

[0012] In one embodiment, the waste residue treatment device further includes a waste residue collection tank, and the waste residue collection tank is located below the second pipeline.

[0013] In one embodiment, the circulation component includes a high-temperature resistant pump, a filter, and a third pipe. The third pipe is connected to the heat exchanger and the preheating component respectively. The high-temperature resistant pump and the filter are arranged in the third pipe.

[0014] In one embodiment, the outer wall of the third pipe is covered with a thermal insulation layer.

[0015] To achieve the above-mentioned object, the present invention provides a foaming furnace, which includes the heat energy recovery device.

[0016] The present invention's technical solution places a heat exchanger within the flue. High-temperature air flows through the heat exchanger, heating the thermal fluid within. A circulation assembly then delivers the fluid to a preheating assembly, transferring heat to the sheet material wrapped around it. Simultaneously, the cooled fluid is returned to the heat exchanger. This cycle recycles heat energy from the exhaust gas, effectively utilizing the heat in the fume. Furthermore, a waste residue treatment device purifies the fume residue condensed on the heat exchanger, reducing the pressure on subsequent exhaust treatment equipment and preventing excessive scaling in the heat exchanger that reduces heat exchange capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of the heat recovery device provided by the present invention;

[0019] Figure 2 A schematic structural diagram of the preheating assembly provided by the present invention;

[0020] Figure 3 A schematic structural diagram of a heat exchanger provided by the present invention;

[0021] Figure 4A structural schematic diagram of a circulation component is provided for the present invention.

[0022] Description of Figure Numbers:

[0023]

[0024]

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or an option in which both A and B are satisfied.

[0029] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Please refer to Figure 1-4The present invention proposes a heat recovery device, which is applied to a foaming furnace. The foaming furnace has a flue 400 for discharging high-temperature exhaust gas. The heat recovery device includes a heat exchanger 100, a preheating component 200 and a circulation component 300. The heat exchanger 100 is arranged in the flue 400. A heat transfer fluid flows in the heat exchanger 100 and exchanges heat with the high-temperature exhaust gas. The heat exchanger 100 is provided with a waste residue treatment device 10. The waste residue treatment device 10 is used to treat the oil smoke condensed on the heat exchanger 100 by the high-temperature exhaust gas. The preheating component 200 is filled with heated heat transfer fluid, and the preheating component 200 is used to preheat the sheet 600. The circulation component 300 is connected to the heat exchanger 100 and the preheating component 200 respectively, and drives the heat transfer fluid to circulate between the heat exchanger 100 and the preheating component 200.

[0031] Specifically, the heat transfer fluid can be a liquid medium with heat conduction function such as heat transfer oil, which is not limited here.

[0032] In this embodiment, the heat exchanger 100 is arranged within the flue 400. High-temperature air flows from bottom to top through the heat exchanger 100, heating the thermal fluid within the heat exchanger 100. The circulation component 300 delivers the thermal fluid to the preheating component 200, transferring the heat to the sheet 600 wrapped around it, while simultaneously returning the cooled thermal fluid to the heat exchanger 100. This cycle recycles the heat energy in the exhaust gas and effectively utilizes the heat in the oil smoke. The waste residue treatment device 10 purifies the oil smoke waste residue condensed on the heat exchanger 100, reducing the pressure of subsequent exhaust gas treatment devices, preventing excessive scaling of the heat exchanger 100 from reducing its heat exchange capacity, and effectively reducing the backflow of oil smoke generated during the foaming process into the foaming unit.

[0033] Please refer to Figure 1 In one embodiment, the preheating assembly 200 includes a first pipe 20 and a roller assembly 21. The first pipe 20 extends through the roller assembly 21. The roller assembly 21 includes a plurality of rollers 211 and a plurality of fixed tubes 212. The rollers 211 are rotatably arranged side by side and spaced apart. A feed channel 213 is formed between the rollers 211, around which the sheet 600 can be conveyed. A fixed tube 212 is axially extending through each roller 211, with both ends of the fixed tube 212 extending out of the roller 211. The first pipe 20 extends within the fixed tube 212, and a heat transfer fluid flows through the first pipe 20.

[0034] In this embodiment, multiple fixed tubes 212 drive multiple rollers 211 to rotate simultaneously, the sheet 600 extends into the feed channel 213, high-temperature air flows through the heat exchanger 100 to heat the thermal fluid, the circulation component 300 sends the thermal fluid to the first pipe 20, the first pipe 20 transfers heat to the roller 211, and the roller 211 transfers heat to the sheet 600. The heat transfer to the sheet 600 through the roller 211 increases the heat transfer area, fully utilizes the heat in the thermal fluid, and improves the quality and efficiency of heat exchange.

[0035] Please refer to Figure 1 In order to facilitate the installation of the roller 211 on the frame, in one embodiment, both ends of the fixed tube 212 passing through the axial direction of the roller 211 extend out of the roller 211.

[0036] Please refer to Figure 1 In one embodiment, the feed channel 213 has a feed end 214 and a discharge end 215, and the preheating component 200 also includes a first drive device 22 connected to the roller assembly 21, and the first drive device 22 drives the roller assembly 21 to drive the sheet 600 from the feed end 214 to the discharge end 215.

[0037] In this embodiment, the end of the first pipe 20 near the discharge end 215 is the oil inlet, and the end of the first pipe 20 near the feed end 214 is the oil outlet. The heat transfer fluid flows into the first pipe 20 from the oil inlet and out of the first pipe 20 from the oil outlet. The sheet 600 absorbs the maximum amount of heat immediately, ensuring efficient heat exchange.

[0038] Please refer to Figure 1 In one embodiment, the first driving device 22 includes a plurality of first sprockets 221, a first chain 222, and a first motor 223. Each first sprocket 221 is mounted on one end of a fixed tube 212. The first chain 222 is meshed in an S-shape to connect two adjacent first sprockets 221. The driving end of the first motor 223 is provided with a driving wheel 224 that meshes with the first chain 222. The first motor 223 drives the driving wheel 224 to rotate the first chain 222, thereby driving the plurality of first sprockets 221 and the plurality of rollers 211 to rotate simultaneously.

[0039] In this embodiment, it is defined that every two adjacent first sprockets 221 include a forward rotating sprocket and a reverse rotating sprocket, and the forward rotating sprocket and the reverse rotating sprocket are arranged in sequence, so that the first chain 222 is S-shaped and meshes with every two adjacent first sprockets 221, so that the feed channel 213 is S-shaped or wavy or sinusoidal, increasing the contact area between the sheet 600 and the roller 211 assembly, making full use of the heat in the heat transfer liquid in the first pipe 20, and improving the quality and efficiency of heat exchange.

[0040] Please refer to Figure 1In one embodiment, the heat exchanger 100 includes a plurality of second pipes 11 arranged in a matrix. The plurality of second pipes 11 are interconnected and flow a heat transfer fluid. The waste residue processing device 10 includes a second drive device 12, a push plate 13, and a plurality of pipe brushes 14 mounted on the push plate 13. Each second pipe 11 passes through the push plate 13, and each pipe brush 14 is movably mounted outside a second pipe 11. The second drive device 12 is connected to the push plate 13 and drives the push plate 13 to cause the pipe brush 14 to reciprocate along the second pipe 11.

[0041] In this embodiment, the duct brush 14 is made of wire, and the second duct 11 is made of metal. Hot air flows upward through the duct, heating the thermal fluid in the second duct 11. Meanwhile, the oil smoke in the hot air condenses on the surface of the second duct 11. The second drive device 12 periodically moves the duct brush 14 back and forth, cleaning the surface of the second duct 11 and preventing excessive scaling that would reduce heat exchange capacity.

[0042] Please refer to Figure 3 In one embodiment, the second driving device 12 includes at least two screw rods 121, at least two second sprockets 122, a second chain 123 and a second motor 124. Each second sprocket 122 is sleeved on the screw rod 121, and the second chain 123 is meshed with each second sprocket 122. The driving end of the second motor 124 is connected to any screw rod 121 and drives the second chain 123 to rotate. The second chain 123 drives the remaining screw rods 121 to rotate to move the push plate 13.

[0043] The number of the screw rods 121 can be two, three, or four. The number of the second sprockets 122 can be two, three, or four. The number of the second sprockets 122 is less than or equal to the number of the screw rods 121.

[0044] Please refer to Figure 1 In one embodiment, the heat exchanger 100 further includes two side plates 15 that are opposed to each other and spaced apart. The ends of the plurality of second pipes 11 are respectively passed through the two side plates 15 , and the push plate 13 is located between the two side plates 15 . The ends of the screw rod 121 are respectively fixed to the two side plates 15 , and the screw rod 121 is connected to the push plate 15 .

[0045] In this embodiment, the second pipe 11 is connected to the first pipe 20 through the circulation assembly 300. In order to ensure the stability of energy conversion of the second pipe 11, two side plates 15 are provided that are opposite and spaced apart.

[0046] In one embodiment, there is one push plate 13, and the plurality of duct brushes 14 are fixed to the push plate 13 and move with the push plate 13. Alternatively, there are two push plates 13 and two second drive devices 12, each of which is connected to a push plate 13 and is provided on either side of the duct brush 14.

[0047] In this embodiment, the push plate 13, driven by the second drive device 12, can move back and forth along the second pipe 11. Regularly moving the pipe brush 14 affixed to the push plate 13 back and forth can clean the surface of the second pipe 11 and prevent excessive scaling that could reduce heat exchange capacity. Alternatively, two second drive devices 12 can sequentially drive the push plates 13 toward each other, also enabling the pipe brush 14 to move back and forth along the second pipe 11, ensuring the surface of the second pipe 11 is clean and preventing excessive scaling that could reduce heat exchange capacity.

[0048] Please refer to Figure 1 In one embodiment, the waste residue treatment device 10 further includes a waste residue collecting trough 16 , which is located below the second pipeline 11 .

[0049] In this embodiment, the waste residue collecting trough 16 is used to collect the waste residue dropped on the second pipe 11 by the pipe brush 14 , thereby simplifying the cleaning steps for the user and being highly practical.

[0050] Please refer to Figure 1 In one embodiment, the circulation component 300 includes a high-temperature resistant pump 30, a filter 31, and a third pipe 32. The third pipe 32 is connected to the heat exchanger 100 and the preheating component 200 respectively. The high-temperature resistant pump 30 and the filter 31 are arranged in the third pipe 32.

[0051] Part of the third pipe 32 is connected to the filter 31 and the second pipe 11 respectively, the high temperature resistant pump 30 is connected to the first pipe 20 and the filter 31 respectively, and part of the third pipe 32 is connected to the first pipe 20 and the second pipe 11 respectively.

[0052] In this embodiment, high-temperature air flows from bottom to top through the heat exchanger 100, heating the thermal fluid in the second pipe 11. The third pipe 32 guides the heated thermal fluid to the filter 31. The filter 31 filters the heated thermal fluid to ensure its thermal conductivity and quality. The high-temperature resistant pump 30 outputs the thermal fluid to the oil inlet end 101 and flows into the first pipe 20. The first pipe 20 transfers the heat to the sheet 600 wound thereon and flows out of the first pipe 20 from the oil outlet end 102. At the same time, the third pipe 32 returns the cold oil to the second pipe 11, realizing the recovery and utilization of heat energy in the exhaust gas and effectively utilizing the heat in the oil smoke.

[0053] Please refer to Figure 1 In one embodiment, the outer wall of the third pipe 32 is covered with a thermal insulation layer.

[0054] In this embodiment, the insulation layer ensures that the heat of the thermal fluid in the third pipe 32 can be transferred from the second pipe 11 to the first pipe 20, reducing heat loss during flow, fully utilizing the heat in the thermal fluid, and improving the quality and efficiency of heat exchange.

[0055] To achieve the above-mentioned purpose, the present invention proposes a foaming furnace, which includes a heat recovery device. The specific structure of the heat recovery device refers to the above-mentioned embodiment. Since the foaming furnace adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0056] The foaming furnace further includes a flue 400 , in which the second pipe 11 is located. The flue 400 is used to discharge excess hot air to the exhaust gas treatment device, thereby protecting the environment and achieving the purpose of energy saving and environmental protection.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat recovery device, applied to a foaming furnace, wherein the foaming furnace has a flue for discharging high-temperature exhaust gas; characterized in that: The heat energy recovery device comprises: a heat exchanger disposed in the flue, wherein a heat-conducting fluid flows through the heat exchanger and exchanges heat with the high-temperature exhaust gas; and wherein the heat exchanger is provided with a waste residue treatment device for treating oil fume agglomerates condensed by the high-temperature exhaust gas on the heat exchanger; a preheating assembly, wherein the heated heat transfer fluid flows through the preheating assembly, and the preheating assembly is used to preheat the sheet; and a circulation component, the circulation component being connected to the heat exchanger and the preheating component respectively, and driving the heat transfer fluid to circulate between the heat exchanger and the preheating component; The preheating assembly includes a first pipe and a roller assembly; the first pipe is provided through the roller assembly, and the roller assembly includes a plurality of rollers and a plurality of fixed tubes; a fixed tube is provided axially through each roller, the first pipe is provided inside the fixed tube, and the heat transfer fluid flows through the first pipe; In which, the heat exchanger includes a plurality of second pipes arranged in a matrix, the plurality of second pipes are interconnected and the heat transfer fluid flows therethrough; the waste residue treatment device includes a second driving device, a push plate and a plurality of pipe brushes arranged on the push plate, each of the second pipes passes through the push plate, and each of the pipe brushes can be movably mounted outside a second pipe.

2. The heat recovery device according to claim 1, characterized in that: The plurality of rollers are rotatably arranged side by side and at intervals, and a feeding channel for winding and conveying the sheet is formed between the plurality of rollers.

3. The heat recovery device according to claim 2, characterized in that: The feed channel has a feed end and a discharge end, and the preheating component further includes a first driving device connected to the roller assembly, and the first driving device drives the roller assembly to move the sheet from the feed end to the discharge end.

4. The heat recovery device according to claim 3, characterized in that: The first driving device includes multiple first sprockets, a first chain and a first motor; each first sprocket is arranged at one end of the fixed tube, the first chain is S-shaped and meshed with every two adjacent first sprockets, and the driving end of the first motor is provided with a driving wheel meshed with the first chain. The first motor drives the driving wheel to drive the first chain to rotate, thereby driving multiple first sprockets and multiple rollers to rotate simultaneously.

5. The heat recovery device according to claim 1, characterized in that: The second driving device is connected to the push plate and drives the push plate to drive the duct brush to reciprocate along the second duct.

6. The heat recovery device according to claim 5, characterized in that: The second driving device includes at least two screw rods, at least two second sprockets, a second chain and a second motor. Each of the second sprockets is sleeved on one of the screw rods. The second chain is meshed with each of the second sprockets. The driving end of the second motor is connected to any one of the screw rods and drives the second chain to rotate. The second chain drives the remaining screw rods to rotate to move the push plate.

7. The heat recovery device according to claim 6, characterized in that: The heat exchanger further includes two side plates that are opposite and spaced apart from each other, the ends of the plurality of second pipes are respectively passed through the two side plates, and the push plate is located between the two side plates; the ends of the screw rod are respectively fixed to the two side plates, and the screw rod is connected to the push plate; And / or, the number of the push plate is one, and the plurality of duct brushes are fixed on the push plate and move with the push plate; or the number of the push plate and the second driving device are both two, the two push plates are respectively arranged on both sides of the duct brush, and each second driving device is connected to one push plate; And / or, the waste residue treatment device further includes a waste residue collecting trough, and the waste residue collecting trough is located below the second pipeline.

8. The heat recovery device according to claim 1, characterized in that: The circulation component includes a high-temperature resistant pump, a filter, and a third pipeline. The third pipeline is connected to the heat exchanger and the preheating component respectively. The high-temperature resistant pump and the filter are arranged in the third pipeline.

9. The heat recovery device according to claim 8, characterized in that: The outer wall surface of the third pipe is covered with a heat-insulating layer.

10. A foaming furnace, characterized in that: Comprising the heat recovery device according to any one of claims 1 to 9.

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