A high heat preservation solar heat supply pipeline with waste heat recovery

Abstract

The application relates to the field of light heat utilization, in particular to a waste heat recovery type high-heat-preservation solar light heat heating pipeline, which comprises a heating pipeline body, a preheating unit and a waste heat recovery pipeline body, the preheating unit and the waste heat recovery pipeline body are arranged on the outer side of the heating pipeline body and are sequentially distributed along the axial direction of the heating pipeline body, a first flow channel for circulating high-temperature heating medium is formed in the heating pipeline body, a second flow channel for circulating low-temperature recovery medium is formed between the heating pipeline body and the waste heat recovery pipeline body, and the second flow channel is communicated with the preheating unit. According to the sequential axial arrangement of the preheating unit and the waste heat recovery pipeline body, the low-temperature recovery medium first exchanges heat with the heat exchange pipe group in the preheating unit, the initial temperature difference with the heating pipeline body is reduced by using the surplus heat of the heating medium to complete preliminary temperature rise, the recovery medium after preheating enters the second flow channel again, the heat radiation of the heating pipeline body is fully absorbed, and the overall waste heat recovery efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of solar thermal utilization, and in particular to a waste heat recovery type high-insulation solar thermal heating pipe. Background Technology

[0002] Solar thermal heating systems are widely used in building heating and industrial heating due to their advantages of being low-carbon, environmentally friendly, and renewable. As the core carrier of energy transmission in the system, the heat loss control and waste heat recovery efficiency of the heating pipes directly affect the overall energy efficiency of the system. To improve energy utilization, existing technologies employ heating pipes with integrated waste heat recovery functions, typically coaxial sleeve structures. This structure can capture low-grade waste heat (such as domestic wastewater and industrial cooling tailwater) for secondary utilization, reducing dependence on solar energy to some extent.

[0003] The problem with existing technology is that the low-temperature recovery medium enters the recovery channel outside the heating pipe directly, creating a significant temperature difference with the high-temperature heating medium. This results in excessive heat loss from the heating medium to the recovery medium, causing additional energy consumption losses in the solar thermal system. Utility Model Content

[0004] In order to reduce the temperature difference between the low-temperature recovery medium and the high-temperature heating medium entering the recovery channel, this application provides a waste heat recovery type high-insulation solar thermal heating pipe.

[0005] The waste heat recovery type high-insulation solar thermal heating pipe provided in this application adopts the following technical solution:

[0006] A high-insulation solar thermal heating pipe with waste heat recovery includes a heating pipe body, a preheating unit, and a waste heat recovery pipe body. The preheating unit and the waste heat recovery pipe body are both located on the outside of the heating pipe body and are distributed sequentially along the axial direction of the heating pipe body. A first flow channel for high-temperature heating medium to circulate is formed inside the heating pipe body, and a second flow channel for low-temperature recovery medium to circulate is formed between the heating pipe body and the waste heat recovery pipe body. The second flow channel is connected to the preheating unit, and a recovery medium inlet is formed on the preheating unit. The low-temperature recovery medium enters the second flow channel after preheating.

[0007] Optionally, the preheating unit includes an outer shell and a heat exchange tube assembly. The two ends of the heat exchange tube assembly are connected to the heating pipe body to communicate with the first flow channel. The outer shell covers the outside of the heat exchange tube assembly and is detachably connected to the heating pipe body. The recovery medium inlet is formed on the outer shell.

[0008] Optionally, one end of the waste heat recovery pipe is connected to the outer shell through a transition connection assembly, and the other end of the waste heat recovery pipe is provided with a recovery medium outlet.

[0009] Optionally, the transition connection assembly includes a variable diameter transition section, a flat-welded flange, and a flow distribution plate. One end of the variable diameter transition section is welded and fixed to the side wall of the outer shell. The flat-welded flange is located at the other end of the variable diameter transition section. One end of the waste heat recovery pipe is connected to the variable diameter transition section through the flat-welded flange. The flow distribution plate is fixed at the end of the variable diameter transition section and located at the inlet end of the waste heat recovery pipe.

[0010] Optionally, a composite insulation layer is also included, which covers the outer periphery of the heating pipe and the waste heat recovery pipe. The composite insulation layer consists of a centrifugal glass surface layer, an aluminum foil reflective layer, and a polyurethane foam layer from the inside out. A detachable insulation sleeve is provided between the outer shell and the waste heat recovery pipe, and the detachable insulation sleeve is wrapped around the transition connection assembly.

[0011] Optionally, the inner wall of the waste heat recovery pipe is provided with a flow guiding spiral section, which extends along the axial direction of the waste heat recovery pipe and is used to guide the waste heat recovery medium to flow uniformly in the circumferential direction.

[0012] Optionally, the outer casing includes two end plates slidably fitted onto the heating pipe body, and two arc-shaped pieces disposed between the two end plates. The two arc-shaped pieces are spliced ​​together, and ear plates are provided at the splice point. The two arc-shaped pieces are detachably connected by fasteners passing through the ear plates.

[0013] Optionally, the transition connection assembly is disposed between one of the end plates and the waste heat recovery tube body, and the inner side of the other end plate is provided with a bracket extending axially along the outer shell body, and the heat exchange tube assembly is mounted on the bracket.

[0014] In summary, this application includes at least one of the following beneficial technical effects:

[0015] 1. This application constructs a stepped waste heat recovery process of "preheating-deep heat exchange" by axially arranging preheating units and waste heat recovery pipes sequentially. The low-temperature recovery medium first exchanges heat with the heat exchange tube group in the preheating unit, using the surplus heat of the heating medium to complete the initial temperature rise, reducing the initial temperature difference with the heating pipe, and fundamentally preventing the reverse heat loss of the high-temperature heating medium; the preheated recovery medium then enters the second flow channel to fully absorb the heat dissipation of the heating pipe, achieving efficient capture of waste heat and improving the overall waste heat recovery efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of an embodiment of this application.

[0017] Figure 2 This is a side view cross-sectional structural diagram of an embodiment of this application.

[0018] Figure 3 This is an embodiment of the present application. Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0019] Reference numerals: 1. Heating pipe body; 11. First flow channel; 2. Preheating unit; 21. Outer shell; 212. End plate; 213. Arc-shaped plate; 214. Ear plate; 215. Fastener; 216. Bracket; 22. Heat exchanger tube assembly; 3. Waste heat recovery pipe body; 31. Transition connection assembly; 311. Variable diameter transition section; 312. Flat welding flange; 313. Flow distribution plate; 32. Flow guiding spiral section; 4. Composite insulation layer; 5. Removable insulation sleeve; 6. Recovery medium inlet; 7. Recovery medium outlet; 8. Second flow channel. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0021] This application discloses a waste heat recovery type high-insulation solar thermal heating pipe. Through the coordinated cooperation of the preheating unit 2 and the waste heat recovery pipe body 3, the waste heat of the recovery medium and the waste heat of the high-temperature heating medium are recovered. At the same time, the heat loss is reduced by the composite insulation structure.

[0022] Reference Figure 1 A high-insulation solar thermal heating pipe with waste heat recovery includes a heating pipe body 1, a preheating unit 2, and a waste heat recovery pipe body 3. The heating pipe body 1 is the core flow component, forming a first flow channel 11 inside for the flow of high-temperature heating media (such as hot water or heat transfer oil). The preheating unit 2 and the waste heat recovery pipe body 3 are sequentially sleeved on the outside of the heating pipe body 1 along its axial direction, and the three are arranged coaxially to ensure stable medium flow. A second annular flow channel 8 is formed between the heating pipe body 1 and the waste heat recovery pipe body 3 for the flow of the recovered medium to be heated, and the second flow channel 8 is connected to the internal space of the preheating unit 2.

[0023] The preheating unit 2 includes an outer shell 21 and a heat exchange tube assembly 22, and its main function is to preheat the recovered medium. The heat exchange tube assembly 22 adopts a serpentine tube structure, and its two ends are connected to the heating pipe body 1 by screws and are connected to the first flow channel 11, so that the high-temperature heating medium can flow through the heat exchange tube assembly 22 and release heat.

[0024] The outer shell 21 covers the outside of the heat exchange tube assembly 22 and adopts a detachable design: it consists of two end plates 212 that slide outside the heating tube 1, and two arc-shaped pieces 213. The two arc-shaped pieces 213 are symmetrically spliced ​​to form a cylindrical shell, and an ear plate 214 is integrally formed at the splice. The detachable connection is achieved by bolts or similar fasteners 215 passing through the ear plates 214. The end plates 212 are fixed to the two ends of the arc-shaped pieces 213 by bolts to ensure the airtightness of the outer shell 21. The recovery medium inlet 6 is opened on the side wall of one of the arc-shaped pieces 213 for connecting the low-temperature recovery medium.

[0025] Furthermore, a bracket 216 extending axially along the outer shell 21 is welded to the inner side of one of the end plates 212, and the heat exchange tube assembly 22 is fixed to the bracket 216 by clips or bolts.

[0026] Reference Figure 1 and Figure 2 The waste heat recovery pipe 3 is a cylindrical sleeve. One end is connected to the outer shell 21 through the transition connection component 31, and the other end has a recovery medium outlet 7 on its side wall. The medium that has absorbed waste heat flows out from this outlet and can be connected to other pipelines to realize the recovery and utilization of waste heat.

[0027] The transition connection assembly 31 includes a diameter-changing transition section 311, a flat-welded flange 312, and a flow distribution plate 313. The large-diameter end of the diameter-changing transition section 311 is welded and fixed to the side wall of the end plate 212 of the outer shell 21, and the small-diameter end is welded to the flat-welded flange 312. One end of the waste heat recovery pipe 3 is connected to the diameter-changing transition section 311 by a corresponding flat-welded flange. A flow distribution plate 313 is provided at the connection between the diameter-changing transition section 311 and the waste heat recovery pipe 3. The flow distribution plate 313 is a circular plate with multiple uniform flow holes and is welded to the inner wall of the diameter-changing transition section to ensure that the medium flowing out of the preheating unit 2 enters the second flow channel 8 uniformly.

[0028] The inner wall of the waste heat recovery pipe body 3 is integrally formed with a flow guiding spiral part 32, which extends continuously along the axial direction of the waste heat recovery pipe body 3 to form a spiral flow guiding channel. After the recovery medium enters the second flow channel 8, it flows evenly in the circumferential direction under the guidance of the flow guiding spiral part 32, which prolongs the contact time with the outer wall of the heating pipe body 1 and improves the waste heat recovery efficiency.

[0029] Reference Figure 2 The heating pipe body 1 and the waste heat recovery pipe body 3 are covered with a composite insulation layer 4 to prevent heat loss to the outside and ensure the insulation effect. A removable insulation sleeve 5 is fitted on the outside of the transition connection component 31 between the outer shell 21 and the waste heat recovery pipe body 3. The removable insulation sleeve 5 is made of rock wool or polyurethane and is removable by zippers or buckles, ensuring the insulation effect of the transition connection and facilitating future maintenance and repair. Preferably, the composite insulation layer 4 consists of a centrifugal glass surface layer, an aluminum foil reflective layer, and a polyurethane foam layer arranged sequentially from the inside to the outside.

[0030] The implementation principle of a waste heat recovery type high-insulation solar thermal heating pipe according to an embodiment of this application is as follows: The high-temperature heating medium enters the first flow channel 11 from one end of the heating pipe body 1. When it flows through the heat exchange tube group 22, it releases some heat and transfers it to the recovery medium in the outer shell 21. The recovery medium enters the outer shell 21 from the recovery medium inlet 6. After fully exchanging heat with the heat exchange tube group 22, it enters the second flow channel 8 evenly through the flow distribution plate 313 of the transition connection component 31. Under the guidance of the flow guide spiral part 32, the recovery medium flows spirally along the second flow channel 8, fully absorbing the waste heat emitted from the outer wall of the heating pipe body 1. After heating up, it flows out from the recovery medium outlet 7. The composite insulation layer 4 and the detachable insulation sleeve 5 reduce heat loss throughout the process, ensuring the heating effect and waste heat recovery effect.

[0031] 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 waste heat recovery type high-insulation solar thermal heating pipe, characterized in that, It includes a heating pipe body, a preheating unit, and a waste heat recovery pipe body. The preheating unit and the waste heat recovery pipe body are both located on the outside of the heating pipe body and are distributed sequentially along the axial direction of the heating pipe body. A first flow channel for high-temperature heating medium to flow is formed inside the heating pipe body, and a second flow channel for low-temperature recovery medium to flow is formed between the heating pipe body and the waste heat recovery pipe body. The second flow channel is connected to the preheating unit, and a recovery medium inlet is formed on the preheating unit. The low-temperature recovery medium enters the second flow channel after preheating.

2. The waste heat recovery type high-insulation solar thermal heating pipe according to claim 1, characterized in that: The preheating unit includes an outer shell and a heat exchange tube assembly. The two ends of the heat exchange tube assembly are connected to the heating pipe body to communicate with the first flow channel. The outer shell covers the outside of the heat exchange tube assembly and is detachably connected to the heating pipe body. The recovery medium inlet is formed on the outer shell.

3. The waste heat recovery type high-insulation solar thermal heating pipe according to claim 2, characterized in that: One end of the waste heat recovery pipe is connected to the outer shell through a transition connection assembly, and the other end of the waste heat recovery pipe is provided with a recovery medium outlet.

4. The waste heat recovery type high-insulation solar thermal heating pipe according to claim 3, characterized in that: The transition connection assembly includes a variable diameter transition section, a flat-welded flange, and a flow distribution plate. One end of the variable diameter transition section is welded and fixed to the side wall of the outer shell. The flat-welded flange is located at the other end of the variable diameter transition section. One end of the waste heat recovery pipe is connected to the variable diameter transition section through the flat-welded flange. The flow distribution plate is fixed at the end of the variable diameter transition section and located at the inlet end of the waste heat recovery pipe.

5. A waste heat recovery type high-insulation solar thermal heating pipe according to claim 3, characterized in that: It also includes a composite insulation layer, which covers the outer periphery of the heating pipe and the waste heat recovery pipe. The composite insulation layer consists of a centrifugal glass surface layer, an aluminum foil reflective layer and a polyurethane foam layer from the inside out. A detachable insulation sleeve is provided between the outer shell and the waste heat recovery pipe, and the detachable insulation sleeve is wrapped around the transition connection assembly.

6. The waste heat recovery type high-insulation solar thermal heating pipe according to claim 1, characterized in that: The inner wall of the waste heat recovery pipe is provided with a flow guiding spiral section, which extends along the axial direction of the waste heat recovery pipe and is used to guide the waste heat recovery medium to flow uniformly in the circumferential direction.

7. The waste heat recovery type high-insulation solar thermal heating pipe according to claim 3, characterized in that: The outer shell includes two end plates that are slidably sleeved on the heating pipe body, and two arc-shaped pieces disposed between the two end plates. The two arc-shaped pieces are spliced ​​together, and ear plates are provided at the splice point. The two arc-shaped pieces are detachably connected by fasteners passing through the ear plates.

8. A waste heat recovery type high-insulation solar thermal heating pipe according to claim 7, characterized in that: The transition connection assembly is disposed between one of the end plates and the waste heat recovery tube body, and the inner side of the other end plate is provided with a bracket extending axially along the outer shell body, and the heat exchange tube assembly is mounted on the bracket.

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