A connecting hose for high-temperature linear focusing heat collection system

Abstract

The utility model discloses a kind of connecting hoses for high-temperature line focusing heat collection system, belong to the technical field of concentrating solar thermal utilization, including pipe body part and the heat preservation part that pipe body part is wrapped in, pipe body part includes the metal bellows, flexible protective layer and metal braid that are successively sleeved from inside to outside, the both ends of metal bellows are equipped with the metal joint that stretches out heat preservation part, metal joint is fixedly connected with the hoop tight collar, hoop tight collar is mutually hooped tight with metal bellows, flexible protective layer and metal braid, metal braid and heat preservation part are laid with electric heat tracing wire and thermocouple. Connecting hose is applied to high-temperature line focusing heat collection system, and the bending deformation of connecting hose whole can fully accommodate the thermal expansion of metal pipeline, and the connecting hose and heat preservation, heat tracing integrated design, greatly improve the convenience and reliability of connecting hose's field installation, eliminate the risk of heat-conducting medium leakage, frozen blockage and the risk of electric heat tracing, heat preservation easily damaged.

Description

Technical Field

[0001] This utility model relates to the field of concentrated solar thermal utilization technology, and in particular to a connecting hose for a high-temperature linear focusing heat collection system. Background Technology

[0002] In concentrated solar power (CSP) systems, the high-temperature medium pipes experience significant thermal expansion. Flexible connections between metal pipes are essential to absorb this expansion. However, traditional flexible connection devices typically consist of several metal pipes connected by swivel joints, allowing relative twisting between them. The first and last metal pipes are connected to the pipes on either side via swivel joints. When the pipes expand, the relative twisting between the metal pipes absorbs the expansion and contraction. However, this flexible connection device introduces a potential risk of leakage due to the continuous twisting at the swivel joints and metal pipe connections.

[0003] Furthermore, the heat transfer medium used in concentrated solar thermal collectors is usually heat transfer oil or molten salt. Both media have high freezing points; for example, the freezing point of binary molten salt is 221℃, and that of heat transfer oil is 12℃. If the ambient temperature is lower than this value, freezing blockage may occur inside the flexible connection device. Therefore, the flexible connection device must adopt anti-condensation measures such as electric heat tracing and insulation. However, when the metal bend and metal pipe are twisted relative to each other through the rotary joint, the electric heat tracing wire and insulation laid outside the metal bend and rotary joint are easily squeezed and damaged, seriously threatening the safe and reliable operation of the system. Frequent inspection and maintenance are required. Moreover, the flexible connection device, electric heat tracing wire and insulation need to be installed in stages, which is complicated and brings great difficulties to the anti-condensation design, construction and installation, operation and maintenance. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems and provide a connecting hose for a high-temperature linear focusing heat collection system. When this connecting hose is applied to a high-temperature linear focusing heat collection system, the overall bending deformation of the connecting hose can fully absorb the thermal expansion of the metal pipe. In addition, the connecting hose is integrated with the insulation and heat tracing design, which greatly improves the convenience and reliability of the on-site installation of the connecting hose and eliminates the risks of heat transfer medium leakage, freezing blockage and the risk of damage to electric heat tracing and insulation.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model discloses a connecting hose for a high-temperature linear focusing heat collection system, including a tube body and an insulation part that wraps around the tube body. The tube body includes a metal corrugated pipe, a flexible protective layer, and a metal braided mesh, which are sequentially arranged from the inside to the outside. The two ends of the metal corrugated pipe are provided with metal connectors extending out of the insulation part. A clamping collar is fixedly connected to the metal connector. The clamping collar clamps the metal corrugated pipe, the flexible protective layer, and the metal braided mesh together. An electric heating wire and a thermocouple are laid between the metal braided mesh and the insulation part.

[0006] Preferably, the insulation portion includes a flexible armored protective sleeve and an insulation material layer filled within the flexible armored protective sleeve.

[0007] Preferably, the flexible armor protective sleeve is a metal spiral sleeve.

[0008] Preferably, the electric heating wire and the thermocouple are attached to the metal braided mesh by metal straps.

[0009] Preferably, the length direction of the electric heating wire and the length direction of the thermocouple are parallel to the axial direction of the metal corrugated pipe, and the lengths of the electric heating wire and the thermocouple are the same as the length of the metal corrugated pipe.

[0010] Preferably, the power cord of the electric heat tracing wire and the output cord of the thermocouple are connected to an external electric heat tracing controller.

[0011] Preferably, there are at least two thermocouples, wherein the two thermocouples are symmetrically arranged on both sides of the metal braided mesh.

[0012] Preferably, the flexible protective layer is a carbon fiber protective sleeve.

[0013] The present invention achieves the following technical advantages over the prior art: In this utility model, a connecting hose for a high-temperature linear focusing solar collector system has metal connectors at both ends of a corrugated metal tube connected to metal pipes. The bending deformation of the entire connecting hose effectively absorbs the thermal expansion of the metal pipes. The electric heating wire and thermocouple are encapsulated between the corrugated metal tube and the insulation, ensuring the safe flow of the heat transfer medium within the corrugated metal tube without freezing or blockage. This significantly improves the operational safety of the concentrating solar collector system. Furthermore, the prefabricated encapsulation of the corrugated metal tube, electric heating wire, and insulation as a single unit prevents problems such as leakage of the heat transfer medium or freezing and blockage, and also prevents torsion that could damage the electric heating wire and insulation. It can be directly installed on-site and requires no maintenance. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the internal structure of the connecting hose for a high-temperature linear focusing solar collector system; Figure 2 This is a connection diagram for connecting the hose and the external electric heat tracing controller.

[0016] Explanation of reference numerals in the attached drawings: 1. Corrugated metal pipe; 2. Flexible protective layer; 3. Metal braided mesh; 4. Metal joint; 5. Clamping collar; 6. Electric heating wire; 7. Thermocouple; 8. Insulation material layer; 9. Flexible armored protective sleeve; 10. Power cord; 11. Output line; 12. Junction box; 13. Temperature transmitter; 14. Temperature control unit; 15. Communication module. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] This embodiment provides a connecting hose for a high-temperature linear focusing solar collector system, such as... Figures 1 to 2 As shown, the system includes a pipe body and an insulation section, with the insulation section enclosing the pipe body. The pipe body comprises, from the inside out, a corrugated metal pipe 1, a flexible protective layer 2, and a metal braided mesh 3. The corrugated metal pipe 1 is flexible and can be bent. Both ends of the corrugated metal pipe 1 have metal connectors 4 extending from the insulation section. These connectors 4 are used to connect to the metal pipes in the high-temperature wire focusing heat collection system on both sides. A clamping ring 5 is fixedly connected to each metal connector 4. The clamping ring 5 clamps the corrugated metal pipe 1, the flexible protective layer 2, and the metal braided mesh 3 together. An electric heating wire 6 and a thermocouple 7 are laid between the metal braided mesh 3 and the insulation section. The electric heating wire 6 provides heat to the connecting hose, and the thermocouple 7 monitors the temperature of the connecting hose.

[0019] The metal corrugated pipe 1 is made of a high-temperature and corrosion-resistant alloy material. The thickness, crests, and pitch of the metal corrugated pipe 1 are determined based on the design temperature, design pressure, and service life. The flexible protective layer 2 isolates the outer metal braided mesh 3, preventing mutual wear between the metal corrugated pipe 1 and the metal braided mesh 3. The material and number of layers of the metal braided mesh 3 are determined based on the design temperature and pressure. The insulation ensures that the surface temperature of the metal corrugated pipe 1 meets the design requirements, reducing heat loss and the energy consumption of the electric heating wire 6. When this connecting hose is applied to a high-temperature linear focusing heat collection system, after connecting the metal pipes on both sides, the bending deformation of the connecting hose can absorb the expansion of the metal pipes. Furthermore, the integrated design of the connecting hose, insulation, and heat tracing significantly improves the convenience and reliability of on-site installation of the connecting hose, eliminating the safety risks caused by leakage of high-temperature heat-conducting media that exist in traditional methods such as rotary joints.

[0020] Furthermore, in this embodiment, as Figures 1 to 2 As shown, the insulation component includes a flexible armored protective sleeve 9 and an insulation material layer 8 filled within the flexible armored protective sleeve 9. The flexible armored protective sleeve 9 is used to restrain the internal insulation material layer 8 and is suspended on the metal joint 4 to reduce the load on the metal bellows 1 inside the connecting hose.

[0021] Furthermore, in this embodiment, as Figures 1 to 2 As shown, the flexible armor protective sleeve 9 can be a metal spiral sleeve made of metal wire.

[0022] In this embodiment, as Figures 1 to 2 As shown, the electric heating wire 6 and the thermocouple 7 are attached to the metal braided mesh 3 by metal strapping.

[0023] Furthermore, in this embodiment, as Figures 1 to 2 As shown, the length directions of the electric heating wire 6 and the thermocouple 7 are parallel to the axial direction of the metal bellows 1, and the lengths of the electric heating wire 6 and the thermocouple 7 are the same as the length of the metal bellows 1. The number and heating power of the electric heating wire 6 are designed according to the anti-condensation requirements of the connecting hose, and redundancy is considered.

[0024] In this embodiment, as Figures 1 to 2 As shown, the power cord 10 of the electric heating wire 6 and the output cord 11 of the thermocouple 7 are connected to the external electric heating controller 8. The temperature of the electric heating wire 6 is adjusted by the external electric heating controller 8, and the temperature monitoring signal of the thermocouple 7 is received by the electric heating wire 6.

[0025] Furthermore, in this embodiment, as Figures 1 to 2As shown, the external electric heat tracing controller 8 includes a junction box 12, a temperature transmitter 13, a temperature control unit 14, and a communication module 15. The junction box 12 is connected to an external 220V power supply and leads it to the temperature control unit 14, and also leads the signal from the thermocouple 7 to the temperature transmitter 13. The temperature transmitter 13 converts the signal into a standard signal before leading it to the temperature control unit 14. The temperature control unit 14 outputs 220V power to the electric heat tracing wire 6. The communication module 15 receives start / stop control commands and temperature control target values, and uploads temperature feedback values ​​and the working status of the electric heat tracing wire 6. The temperature control unit 14 starts / stops the electric heat tracing wire 6 and controls the temperature of the electric heat tracing wire 6 according to the signal from the communication module 15.

[0026] Furthermore, in this embodiment, as Figures 1 to 2 As shown, there are at least two thermocouples 7, with the two thermocouples 7 symmetrically arranged on both sides of the metal braided mesh 3.

[0027] In this embodiment, as Figures 1 to 2 As shown, the flexible protective layer 2 is a carbon fiber protective sleeve.

[0028] In this embodiment, as Figures 1 to 2 As shown, the two metal pipes can be a linear receiver and a heat transfer medium header. The length of the connecting hose is determined by checking the vertical height, horizontal movement distance, maximum bending radius during expansion, and design life of the linear receiver and heat transfer medium header connected at both ends. Taking a molten salt linear Fresnel collector system as an example, the working process of this device is described in detail: The rated heat collection temperature of the molten salt linear Fresnel collector system is 550℃, the overall length of the linear receiver is 600 meters, and the maximum thermal expansion displacement is 6 meters. The vertical height between the linear receiver and the connecting hose is 8 meters. To adapt to the high-temperature molten salt working conditions and meet the maximum expansion position of 6 meters, the material of the metal bellows 1 of the connecting hose is selected as TP347H. The specifications of the metal bellows 1 in the connecting hose (material, wave height, wave pitch, wall thickness, etc.) are determined by stress analysis calculation. Under the constraints of radial displacement and reciprocating number (life), the minimum dynamic / static bending radius is calculated to be 6 meters, and the hose length is 10.5 meters. The specifications of the metal braided mesh 3 (number of layers, wire diameter, number of strands, braiding angle, etc.) allow the mesh sleeve to withstand a burst pressure of 10 MPa. The connecting hose is equipped with an electric heating wire 6 with a heat tracing power of 100 W / m, with one in operation and two on standby. Two thermocouples 7 are configured, with a temperature measurement range of -35~650℃. The insulation material is a low thermal conductivity aerogel material, and the maximum surface temperature of the flexible armored protective layer 5 does not exceed 45℃.

[0029] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A connecting hose for a high-temperature linear focusing solar collector system, characterized in that, The device includes a pipe body and an insulation section that encloses the pipe body. The pipe body includes a corrugated metal pipe, a flexible protective layer, and a metal braided mesh, which are sequentially arranged from the inside out. The two ends of the corrugated metal pipe are provided with metal joints that extend out of the insulation section. A clamping collar is fixedly connected to the metal joint. The clamping collar clamps the corrugated metal pipe, the flexible protective layer, and the metal braided mesh together. An electric heating wire and a thermocouple are laid between the metal braided mesh and the insulation section.

2. The connecting hose for a high-temperature linear focusing solar collector system according to claim 1, characterized in that, The insulation component includes a flexible armored protective sleeve and an insulation material layer filled within the flexible armored protective sleeve.

3. The connecting hose for a high-temperature linear focusing solar collector system according to claim 2, characterized in that, The flexible armor protective sleeve is made of metal spiral wrapping.

4. The connecting hose for a high-temperature linear focusing solar collector system according to claim 1, characterized in that, The electric heating wire and the thermocouple are attached to the metal braided mesh by metal straps.

5. A connecting hose for a high-temperature linear focusing solar collector system according to claim 4, characterized in that, The length direction of the electric heating wire and the length direction of the thermocouple are parallel to the axial direction of the metal corrugated pipe, and the length of the electric heating wire, the length of the thermocouple and the length of the metal corrugated pipe are the same.

6. A connecting hose for a high-temperature linear focusing solar collector system according to claim 5, characterized in that, The power cord of the electric heat tracing wire and the output cord of the thermocouple are connected to an external electric heat tracing controller.

7. A connecting hose for a high-temperature linear focusing solar collector system according to claim 6, characterized in that, The thermocouples are at least two in number, with the two thermocouples symmetrically arranged on both sides of the metal braided mesh.

8. A connecting hose for a high-temperature linear focusing solar collector system according to claim 1, characterized in that, The flexible protective layer is a carbon fiber protective sleeve.

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