Waste heat recovery system for energy conservation and emission reduction

Abstract

The utility model discloses a waste heat recovery system for energy conservation and emission reduction, and relates to the technical field of energy recovery. According to the main technical scheme, the heat exchanger comprises a metal heat exchange tube, a heat exchange outer tube, a rib separation plate and an annular separation piece, the outer wall of the metal heat exchange tube is sleeved with the heat exchange outer tube, and the rib separation plate is connected between the metal heat exchange tube and the heat exchange outer tube; the annular spacers are arranged between the metal heat exchange tube and the heat exchange outer tube in a sleeving manner, the annular spacers are sequentially arranged in the direction from one end of the metal heat exchange tube to the other end of the metal heat exchange tube, and a rib separating partition plate is connected between any two adjacent annular spacers; flow guide holes are formed in the annular spacers, and the flow guide holes in every two adjacent annular spacers are distributed in the two sides of the rib separating partition plate. The purposes of recovering waste heat in the waste materials and achieving energy conservation and emission reduction are achieved. And meanwhile, the residence time of materials such as waste gas and waste water in the flow channel is effectively prolonged, so that the waste heat of the materials in the waste gas and the waste water is absorbed by newly-fed back hot water, and the aim of improving the waste heat recovery effect in the materials such as the waste gas and the waste water is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy recovery, in particular to a waste heat recovery system for energy conservation and emission reduction. Background Art

[0002] Most of the industrial waste such as industrial waste water and waste gas has the characteristics of large discharge volume and high temperature.

[0003] The existing patent discloses an industrial waste water waste heat recovery device, which includes a hot water storage tank and a waste heat recovery heat exchanger. The waste heat recovery heat exchanger includes a metal heat exchange tube with flanges at both ends. An outer heat exchange tube is coaxially arranged outside the metal heat exchange tube. A plurality of annular spacers are arranged between the outer heat exchange tube and the metal heat exchange tube along the axial direction of the metal heat exchange tube. At least three partition ribs are also arranged between the outer heat exchange tube and the metal heat exchange tube and are distributed in an equally spaced angular annular array around the axis of the metal heat exchange tube. A waste heat recovery flow channel monomer is formed between two adjacent partition ribs, two adjacent annular spacers, the metal heat exchange tube and the outer heat exchange tube. A first diversion port close to one partition rib is opened on one annular spacer on one side of the waste heat recovery flow channel monomer, and a second diversion port close to the other partition rib is opened on the other annular spacer on the other side. By connecting circulating water pipes at both ends of each waste heat recovery flow channel (composed of a plurality of waste heat recovery flow channel monomers connected end to end) and making the circulating water pipes in series with the hot water storage tank, the function of collecting and reasonably utilizing the returned hot water is realized.

[0004] During the use process, the returned hot water flows in the waste heat recovery flow channel from one end of the waste heat recovery flow channel to the other end, and the temperature of the returned hot water gradually increases. As the temperature of the returned hot water increases, the waste heat recovery effect of the returned hot water gradually decreases. And a longer waste heat recovery flow channel will prolong the residence time of the higher temperature returned hot water in the waste heat recovery flow channel, thereby greatly reducing the waste heat recovery effect. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a waste heat recovery system for energy conservation and emission reduction. By extending the length of the flow channels for materials such as waste gas and waste water, the residence time of waste gas, waste water and other materials in the flow channels can be effectively extended, so as to facilitate the absorption of the waste heat of the materials in the waste gas and waste water by the newly incoming returned hot water, thereby achieving the purpose of improving the waste heat recovery effect of the waste gas, waste water and other materials.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A waste heat recovery system for energy conservation and emission reduction, comprising a metal heat exchange tube and a heat exchange outer tube. The heat exchange outer tube is sleeved on the outer wall of the metal heat exchange tube. The system further includes a dividing rib partition and an annular spacer. The dividing rib partition is connected between the metal heat exchange tube and the heat exchange outer tube, and the dividing rib partition extends along the direction from one end of the metal heat exchange tube to the other end of the metal heat exchange tube. The annular spacer is sleeved between the metal heat exchange tube and the heat exchange outer tube. A plurality of the annular spacers are sequentially arranged along the direction from one end of the metal heat exchange tube to the other end of the metal heat exchange tube, and the dividing rib partition is connected between any two adjacent annular spacers. A diversion hole is provided on the annular spacer, and the diversion holes on any two adjacent annular spacers are distributed on both sides of the dividing rib partition. Wherein, both ends of the metal heat exchange tube are respectively used for accessing and discharging the return hot water. The diversion holes on the annular spacers at both ends of the metal heat exchange tube are respectively used for accessing and discharging the waste material.

[0008] A further scheme is that: the diversion hole is close to the dividing rib partition.

[0009] A further scheme is that: the dividing rib partitions are coaxially arranged.

[0010] A further scheme is that: one end of the metal heat exchange tube is used for accessing the return hot water, and the diversion hole on the annular spacer close to the other end of the metal heat exchange tube is used for accessing the waste material.

[0011] A further scheme is that: the waste heat recovery system further includes a heat insulation sheath; the heat insulation sheath is sleeved on the outer wall of the heat exchange outer tube.

[0012] A further scheme is that: the waste heat recovery system further includes a recovery pipe; a receiving groove is formed on the inner wall of the recovery pipe; the recovery pipe is sleeved between the heat insulation sheath and the heat exchange outer tube, and a receiving cavity is formed between the bottom and the side wall of the receiving groove and the heat exchange outer tube; a return hot water inlet and a return hot water outlet are respectively provided at both ends of the recovery pipe; both the return hot water inlet and the return hot water outlet are communicated with the receiving cavity.

[0013] A further scheme is that: the return hot water outlet and the return hot water inlet are sequentially arranged along the direction from one end of the metal heat exchange tube to the other end of the metal heat exchange tube.

[0014] A further scheme is that: the recovery pipe is made of heat insulation material.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] During the process of the low-temperature return hot water flowing from one end of the metal heat exchange tube to the other end, the return hot water can absorb the heat of the waste materials in the flow channel. The waste heat in the waste materials is recovered to achieve the purpose of energy conservation and emission reduction. At the same time, the length of the flow channels for materials such as waste gas and waste water is effectively extended. The residence time of materials such as waste gas and waste water in the flow channel is effectively extended, so that the newly introduced return hot water can absorb the waste heat of the materials in the waste gas and waste water, thereby improving the waste heat recovery effect of materials such as waste gas and waste water. Description of the Drawings

[0017] Figure 1 This is a partial sectional structural schematic diagram of a waste heat recovery system for energy conservation and emission reduction in this embodiment.

[0018] Markings in the drawings and corresponding component names:

[0019] 1 - Metal heat exchange tube; 2 - Heat exchange outer tube; 3 - Dividing rib plate; 4 - Annular spacer; 5 - Flow guiding hole; 6 - Heat insulation sheath; 7 - Recovery pipe; 8 - Accommodation cavity; 9 - Return hot water inlet; 10 - Return hot water outlet; 11 - Flow channel unit. Detailed Embodiment

[0020] The present utility model will be further described below with reference to the drawings.

[0021] Embodiment 1

[0022] The existing patent document with the application number 202320031829.2 discloses an industrial wastewater waste heat recovery device, including a hot water storage tank and a waste heat recovery heat exchanger. The waste heat recovery heat exchanger includes a metal heat exchange tube with flanges provided at both ends. An outer heat exchange tube arranged coaxially is provided outside the metal heat exchange tube. A number of annular spacers arranged along the axial direction of the metal heat exchange tube are provided between the heat exchange outer tube and the metal heat exchange tube. At least three dividing rib plates distributed in an equiangular annular array around the axis of the metal heat exchange tube are also provided between the heat exchange outer tube and the metal heat exchange tube. A waste heat recovery flow channel monomer is formed between two adjacent dividing rib plates, two adjacent annular spacers, the metal heat exchange tube and the heat exchange outer tube.

[0023] When the existing industrial wastewater waste heat recovery device is in use, by connecting circulating water pipes at both ends of each waste heat recovery flow channel (composed of a number of waste heat recovery flow channel monomers connected end to end), and connecting the circulating water pipes in series with the hot water storage tank, the function of collecting and reasonably utilizing the returned hot water is realized. It effectively extends the length of the waste heat recovery flow channel for capturing heat energy, improving the waste heat recovery utilization rate. However, when the returned hot water flows in the waste heat recovery flow channel from one end of the waste heat recovery flow channel to the other end, the returned hot water absorbs the heat energy of the wastewater in the metal heat exchange pipe, and the temperature of the returned hot water gradually increases, while the temperature of the wastewater gradually decreases. As the temperature of the returned hot water increases, the waste heat recovery effect of the returned hot water gradually decreases. And the longer waste heat recovery flow channel will extend the residence time of the higher temperature returned hot water in the waste heat recovery flow channel, thus greatly reducing the waste heat recovery effect.

[0024] Therefore, this embodiment provides a waste heat recovery system for energy conservation and emission reduction, as Figure 1 shown, including a metal heat exchange pipe 1 and a heat exchange outer pipe 2. The heat exchange outer pipe 2 is sleeved on the outer wall of the metal heat exchange pipe 1. It also includes a dividing rib partition 3 and an annular spacer 4. The dividing rib partition 3 is connected between the metal heat exchange pipe 1 and the heat exchange outer pipe 2, and the dividing rib partition 3 extends along the direction from one end of the metal heat exchange pipe 1 to the other end of the metal heat exchange pipe 1; the annular spacer 4 is sleeved between the metal heat exchange pipe 1 and the heat exchange outer pipe 2, and a number of the annular spacers 4 are arranged in sequence along the direction from one end of the metal heat exchange pipe 1 to the other end of the metal heat exchange pipe 1, and the dividing rib partition 3 is connected between any two adjacent annular spacers 4; a diversion hole 5 is arranged on the annular spacer 4, and the diversion holes 5 on any two adjacent annular spacers 4 are distributed on both sides of the dividing rib partition 3; wherein, both ends of the metal heat exchange pipe 1 are respectively used for accessing and discharging the returned hot water; the diversion holes 5 on the annular spacers 4 at both ends of the metal heat exchange pipe 1 are respectively used for accessing and discharging the waste.

[0025] Exemplarily, during the implementation process, one end of the metal heat exchange pipe 1 is used for accessing the low-temperature returned hot water, and the other end of the metal heat exchange pipe 1 is used for discharging the high-temperature returned hot water.

[0026] The heat exchange outer pipe 2 is sleeved on the outer wall of the metal heat exchange pipe 1.

[0027] The dividing rib partition 3 is arranged between the inner wall of the heat exchange outer pipe 2 and the outer wall of the metal heat exchange pipe 1, and the dividing rib partition 3 extends along the length direction of the metal heat exchange pipe 1. Among them, one side of the dividing rib partition 3 close to the outer wall of the metal heat exchange pipe 1 is hermetically connected to the outer wall of the metal heat exchange pipe 1 by means of welding fixation, screw connection fixation or integral molding, etc., and one side of the dividing rib partition 3 close to the inner wall of the heat exchange outer pipe 2 is hermetically connected to the inner wall of the heat exchange outer pipe 2 by means of welding fixation, screw connection fixation or integral molding, etc.

[0028] The annular spacer 4 is arranged between the outer wall of the metal heat exchange tube 1 and the outer wall of the heat exchange outer tube 2. Among them, one side of the annular spacer 4 close to the outer wall of the metal heat exchange tube 1 is hermetically connected to the outer wall of the metal heat exchange tube 1 by means of welding fixation, screw connection fixation or integral molding, etc., and one side of the annular spacer 4 close to the heat exchange outer tube 2 is hermetically connected to the inner wall of the heat exchange outer tube 2 by means of welding fixation, screw connection fixation or integral molding, etc. The number of the annular spacers 4 is set to be several, and the several annular spacers 4 are arranged at a certain interval along the direction from one end of the metal heat exchange tube 1 to the other end of the metal heat exchange tube 1. Among them, a dividing rib partition 3 is installed between any two adjacent annular spacers 4, and the annular spacer 4 is hermetically connected to the dividing rib partition by means of welding fixation, screw connection fixation or integral molding, etc. A diversion hole 5 is formed in the annular spacer 4, and the diversion hole 5 extends along the direction from one end of the metal heat exchange tube 1 to the other end of the metal heat exchange tube 1 and penetrates through the annular spacer 4, so as to form a flow channel unit 11 extending from one side of the dividing rib partition 3 of the diversion hole 5 to the other side of the dividing rib partition 3 between two adjacent annular spacers 4, and the flow channel units 11 are communicated to form a flow channel. Among them, the diversion holes 5 on two adjacent annular spacers 4 are respectively located on both sides of the dividing rib partition 3 between the two adjacent annular spacers 4.

[0029] Among them, the diversion holes 5 on the two annular spacers 4 close to both ends of the metal heat exchange tube 1 among the several annular spacers 4 are respectively used for accessing waste materials (such as high-temperature waste water, waste gas, etc.) and discharging waste materials (such as low-temperature waste water, waste gas, etc.). That is to say, the diversion hole 5 on the annular spacer 4 closest to one end of the metal heat exchange tube 1 is used for accessing / discharging waste materials, and the diversion hole 5 on the annular spacer 4 closest to the other end of the metal heat exchange tube 1 is used for discharging / accessing waste materials. It can also be understood that the diversion holes 5 on the two annular spacers 4 located on both sides among the several annular spacers 4 are respectively used for accessing waste materials and discharging waste materials.

[0030] During use, low-temperature return hot water is introduced from one end of the metal heat exchange tube 1, and the return hot water flows along the inner pipe of the metal heat exchange tube 1 towards the other end of the metal heat exchange tube 1. Waste materials are accessed from the diversion hole 5 on the annular spacer 4 closest to one end of the metal heat exchange tube 1 / the diversion hole 5 on the annular spacer 4 closest to the other end of the metal heat exchange tube 1, and after the waste materials flow through the flow channel, the waste materials are discharged from the diversion hole 5 on the annular spacer 4 closest to the other end of the metal heat exchange tube 1 / the diversion hole 5 on the annular spacer 4 closest to one end of the metal heat exchange tube 1. On the one hand, during the process of the low-temperature return hot water flowing from one end of the metal heat exchange tube 1 to the other end of the metal heat exchange tube 1, the return hot water can absorb the heat of the waste materials in the flow channel. The waste heat in the waste materials is recovered to achieve the purpose of energy conservation and emission reduction. On the other hand, the length of the flow channels for materials such as waste gas and waste water is effectively extended. The residence time of materials such as waste gas and waste water in the flow channel is effectively extended, so that the newly introduced return hot water can absorb the waste heat of the materials in the waste gas and waste water, thereby improving the waste heat recovery effect of materials such as waste gas and waste water.

[0031] Example 2

[0032] As Figure 1 shown, on the basis of the above-mentioned Example 1, in this example, the diversion holes 5 are close to the dividing ribs 3.

[0033] Exemplarily, during implementation, the diversion holes 5 on the annular spacer 4 are close to the dividing ribs 3. Such that the flow channel unit 11 extending from one side of the dividing ribs 3 to the other side of the dividing ribs 3 between two adjacent annular spacers 4 can be in the longest state. It achieves the purpose of further extending the flow channel length, and further extending the residence time of materials such as waste gas and waste water in the flow channel, so as to facilitate the absorption of the waste heat of the materials in the waste gas and waste water by the newly introduced return hot water, thereby further improving the waste heat recovery effect of materials such as waste gas and waste water.

[0034] Example 3

[0035] As Figure 1 shown, on the basis of the above-mentioned Example 2, in this example, the dividing ribs 3 are coaxially arranged.

[0036] Exemplarily, during implementation, the axes of all the dividing ribs 3 are on the same straight line, and this straight line is parallel to the axis of the metal heat exchange tube 1. Such that each flow channel unit 11 can be in the longest state. It achieves the purpose of further extending the flow channel length, and further extending the residence time of materials such as waste gas and waste water in the flow channel, so as to facilitate the absorption of the waste heat of the materials in the waste gas and waste water by the newly introduced return hot water, thereby further improving the waste heat recovery effect of materials such as waste gas and waste water.

[0037] Example 4

[0038] As Figure 1 shown, on the basis of the above-mentioned Example 1, in this example, one end of the metal heat exchange tube 1 is used to access return hot water, and the diversion holes 5 on the annular spacer 4 close to the other end of the metal heat exchange tube 1 are used to access waste materials.

[0039] Exemplarily, during implementation, one end of the metal heat exchange tube 1 is used to access low-temperature return hot water, and the diversion holes 5 on the annular spacer 4 close to the other end of the metal heat exchange tube 1 are used to access waste materials. That is to say, the return hot water in the metal heat exchange tube 1 flows along the direction from one end of the metal heat exchange tube 1 to the other end of the metal heat exchange tube 1, and the materials in the flow channel flow along the direction from the other end of the metal heat exchange tube 1 to one end of the metal heat exchange tube 1, that is, the flow direction of the return hot water in the metal heat exchange tube 1 is opposite to the flow direction of the materials.

[0040] During use, as the hot return water in the metal heat exchange tube 1 flows from one end of the metal heat exchange tube 1 to the other end, the hot return water in the metal heat exchange tube 1 absorbs the heat in the material, and the temperature of the hot return water in the metal heat exchange tube 1 gradually increases. That is to say, the hot return water at one end of the metal heat exchange tube 1 has the lowest temperature. As the material flows from the other end of the metal heat exchange tube 1 to one end along the flow channel, the heat in the material is absorbed by the hot return water, and the temperature of the material itself gradually decreases. That is to say, the material at the other end of the metal heat exchange tube 1 has the lowest temperature. This achieves the purpose of facilitating the hot return water at the lowest temperature in the metal heat exchange tube 1 to absorb the heat in the material at the lowest temperature, thereby further improving the waste heat recovery effect in the material.

[0041] Embodiment 5

[0042] As Figure 1 shown, on the basis of the above-mentioned Embodiment 4, in this embodiment, the waste heat recovery system further includes a heat insulation sheath 6; the heat insulation sheath 6 is sleeved on the outer wall of the heat exchange outer tube 2.

[0043] Exemplarily, during implementation, the waste heat recovery system further includes a heat insulation sheath 6, and the heat insulation sheath 6 is made of heat insulation materials such as foam plastic, superfine glass wool, high silica cotton or vacuum insulation board. The heat insulation sheath 6 is sleeved on the outer wall of the heat exchange outer tube 2. This achieves the purpose of effectively reducing the risk of heat loss from the material between the heat exchange outer tube 2 and the metal heat exchange tube 1 to the external environment from the outer wall of the heat exchange outer tube 2, thereby reducing heat loss and improving the overall waste heat recovery effect.

[0044] Embodiment 6

[0045] As Figure 1 shown, on the basis of the above-mentioned Embodiment 5, in this embodiment, the waste heat recovery system further includes a recovery pipe 7; a receiving groove is formed on the inner wall of the recovery pipe 7; the recovery pipe 7 is sleeved between the heat insulation sheath 6 and the heat exchange outer tube 2, and a receiving cavity 8 is formed between the bottom of the receiving groove, the side wall of the receiving groove and the heat exchange outer tube 2; the two ends of the recovery pipe 7 are respectively provided with a hot return water inlet 9 and a hot return water outlet 10; both the hot return water inlet 9 and the hot return water outlet 10 are communicated with the receiving cavity 8.

[0046] Exemplarily, during implementation, the waste heat recovery system further includes a recovery pipe 7, and a receiving groove is formed on the inner wall of the recovery pipe 7. The recovery pipe 7 is sleeved between the heat insulation sheath 6 and the heat exchange outer tube 2 to form a receiving cavity 8 between the bottom of the receiving groove, the side wall of the receiving groove and the heat exchange outer tube 2. A hot return water inlet 9 and a hot return water outlet 10 are respectively provided at both ends of the recovery pipe 7, and both the hot return water inlet 9 and the hot return water outlet 10 are communicated with the receiving cavity 8.

[0047] During use, low-temperature return hot water is respectively introduced into one end of the metal heat exchange tube 1 and the return hot water inlet 9 on the recovery tube 7. The return hot water in the metal heat exchange tube 1 absorbs the residual heat in the material from the inner side of the heat exchange outer tube 2 during the process of flowing from one end of the metal heat exchange tube 1 to the other end. At the same time, the return hot water in the recovery tube 7 absorbs the residual heat in the material from the outer wall of the heat exchange outer tube 2 during the process of flowing from the return hot water inlet 9 through the accommodation cavity 8 to the return hot water outlet 10. Thus, the purpose of improving the absorption efficiency of the residual heat of the material in the heat exchange outer tube 2 is achieved. At the same time, the heat insulation sheath 6 is sleeved on the outer wall of the recovery tube 7, which can effectively reduce the risk of heat dissipation of the return hot water in the recovery tube 7 from the heat exchange outer tube 2 to the external environment, thereby reducing heat loss.

[0048] Example 7

[0049] As Figure 1 shown, on the basis of the above Example 6, in this example, the return hot water outlet 10 and the return hot water inlet 9 are arranged in sequence along the direction from one end of the metal heat exchange tube 1 to the other end of the metal heat exchange tube 1.

[0050] Exemplarily, during the implementation process, the return hot water outlet 10 and the return hot water inlet 9 are arranged in sequence along the direction from one end of the metal heat exchange tube 1 to the other end of the metal heat exchange tube 1. That is to say, the return hot water in the recovery tube 7 flows along the direction from the other end of the metal heat exchange tube 1 to one end of the metal heat exchange tube 1. That is, the flow direction of the return hot water in the recovery tube 7 is opposite to the flow direction of the return hot water in the metal heat exchange tube 1, and the flow direction of the return hot water in the recovery tube 7 is the same as the flow direction of the material.

[0051] During use, the return hot water in the metal heat exchange tube 1 absorbs the heat in the material during the process of flowing from one end of the metal heat exchange tube 1 to the other end, and the temperature of the return hot water itself gradually increases. That is to say, the return hot water at one end of the metal heat exchange tube 1 has the lowest temperature. The material flows from the other end of the metal heat exchange tube 1 to one end of the metal heat exchange tube 1 in the flow channel, and the heat in the material is absorbed by the return hot water, and the temperature of the material itself gradually decreases. That is to say, the material at the other end of the metal heat exchange tube 1 has the lowest temperature. The return hot water in the recovery tube 7 absorbs the heat in the material during the process of flowing from the other end of the metal heat exchange tube 1 to one end of the metal heat exchange tube 1, and the temperature of the return hot water in the recovery tube 7 itself gradually increases. That is to say, the return hot water in the recovery tube 7 close to the other end of the metal heat exchange tube 1 has the lowest temperature. The purpose of facilitating the return hot water at the lowest temperature in the recovery tube 7 to absorb the heat in the material at a higher temperature from the beginning is achieved, thereby further improving the effect of recovering the residual heat in the material.

[0052] Preferably, at a position close to one end of the metal heat exchange tube 1, that is, at the position of the hot water return outlet 10 on the recovery tube 7. The temperature of the hot water returning in the recovery tube 7 rises, and the temperature of the material in the flow channel will be further reduced under the action of the low-temperature hot water returning in the metal heat exchange tube 1. Therefore, in order to reduce the risk of the heat of the hot water returning in the recovery tube 7 flowing back to the material in the flow channel. The distance between the end face of the heat recovery tube close to one end of the metal heat exchange tube 1 and the end face of one end of the metal heat exchange tube 1 is greater than the distance between the end face of the heat exchange outer tube 2 close to one end of the metal heat exchange tube 1 and the end face of one end of the metal heat exchange tube 1.

[0053] Embodiment 8

[0054] As Figure 1 shown, on the basis of the above Embodiment 7, in this embodiment, the recovery tube 7 is made of a heat-insulating material.

[0055] Exemplarily, during implementation, the recovery tube 7 is made of a heat-insulating material such as foam plastic, superfine glass wool, high-silica oxygen cotton or a vacuum heat-insulating board. The purpose of reducing the risk of heat loss from the recovery tube 7 to the external environment is achieved, thereby improving the heat recovery efficiency.

[0056] Preferably, the above-mentioned recovery tube 7 and the heat-insulating sheath 6 are arranged in an integrally formed manner.

[0057] Although the present invention has been described herein with reference to multiple illustrative embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and embodiments that will fall within the scope of the principles and spirit disclosed in this application. More specifically, within the scope of the disclosure, the drawings and the claims of this application, various variations and improvements can be made to the components and / or the layout of the subject combination layout. In addition to the variations and improvements made to the components and / or the layout, other uses will also be obvious to those skilled in the art.

Claims

1. A waste heat recovery system for energy conservation and emission reduction, comprising a metal heat exchange tube (1) and a heat exchange outer tube (2), wherein the heat exchange outer tube (2) is sleeved on the outer wall of the metal heat exchange tube (1), and is characterized in that, Further comprising: A rib-dividing partition plate (3), which is connected between the metal heat exchange tube (1) and the heat exchange outer tube (2), and the rib-dividing partition plate (3) extends along the direction from one end of the metal heat exchange tube (1) to the other end of the metal heat exchange tube (1); An annular spacer (4), which is sleeved between the metal heat exchange tube (1) and the heat exchange outer tube (2), and a plurality of the annular spacers (4) are sequentially arranged along the direction from one end of the metal heat exchange tube (1) to the other end of the metal heat exchange tube (1), and the rib-dividing partition plate (3) is connected between any two adjacent annular spacers (4); a diversion hole (5) is provided on the annular spacer (4), and the diversion holes (5) on any two adjacent annular spacers (4) are distributed on both sides of the rib-dividing partition plate (3); Wherein, both ends of the metal heat exchange tube (1) are respectively used for accessing and discharging the return hot water; the diversion holes (5) on the annular spacers (4) at both ends of the metal heat exchange tube (1) are respectively used for accessing and discharging the waste materials.

2. The waste heat recovery system according to claim 1, wherein: The diversion hole (5) is close to the rib-dividing partition plate (3).

3. The waste heat recovery system according to claim 2, wherein: Each of the rib-dividing partition plates (3) is coaxially arranged.

4. The waste heat recovery system according to claim 1, wherein: One end of the metal heat exchange tube (1) is used for accessing the return hot water, and the diversion hole (5) on the annular spacer (4) close to the other end of the metal heat exchange tube (1) is used for accessing the waste materials.

5. The waste heat recovery system according to claim 4, wherein: Further comprising a heat insulation sheath (6); The heat insulation sheath (6) is sleeved on the outer wall of the heat exchange outer tube (2).

6. The waste heat recovery system according to claim 5, wherein: Further comprising a recovery pipe (7); A receiving groove is formed on the inner wall of the recovery pipe (7); The recovery pipe (7) is sleeved between the heat insulation sheath (6) and the heat exchange outer tube (2), and a receiving cavity (8) is formed between the bottom of the receiving groove, the side wall of the receiving groove and the heat exchange outer tube (2); Both ends of the recovery pipe (7) are respectively provided with a return hot water inlet (9) and a return hot water outlet (10); Both the return hot water inlet (9) and the return hot water outlet (10) are communicated with the receiving cavity (8).

7. The waste heat recovery system according to claim 6, wherein: The return hot water outlet (10) and the return hot water inlet (9) are sequentially arranged along the direction from one end of the metal heat exchange tube (1) to the other end of the metal heat exchange tube (1).

8. The waste heat recovery system according to claim 7, wherein: The recovery pipe (7) is made of heat insulation material.

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