Instrumentation Piping Composite Heat Tracing System

Abstract

This invention provides a composite heat tracing system for instrument piping. The composite heat tracing system for instrument piping according to an embodiment of this invention includes a piping body, a heat-conducting layer, a heat tracing cable, a composite insulation layer, and a protective outer shell. The heat-conducting layer is sleeved on the piping body, and the heat tracing cable is embedded in an embedding groove on the inner wall of the heat-conducting layer, abutting against the piping body; the composite insulation layer is sleeved on the outside of the heat-conducting layer; and the protective outer shell is disposed on the outside of the composite insulation layer. Therefore, by setting the aforementioned heat-conducting layer, heat tracing cable, and composite insulation layer, the composite heat tracing system for instrument piping according to this invention can improve heat transfer efficiency and reduce heat loss. The composite heat tracing system for instrument piping according to this invention features high heat transfer efficiency and low heat loss.

Description

Technical Field

[0001] This invention belongs to the field of heat tracing technology, specifically relating to a composite heat tracing system for instrument pipelines. Background Technology

[0002] In the daily operation of thermal power plants and combined heat and power plants, thermal control instrument pipelines are core components, encompassing various types such as transmitter pressure guide pipes, water level sampling pipes, and pressure measurement pipelines. They undertake the important functions of accurately acquiring unit operating parameters and transmitting signals, and are the basic support for ensuring the accuracy of unit parameter monitoring and the stable and reliable operation of automatic control systems. They are directly related to the continuity and safety of power plant production.

[0003] Due to the low temperatures of winter, especially in the frigid northern regions where ambient temperatures often drop to tens of degrees below zero Celsius, the media (such as water and steam condensate) in thermal control instrument pipelines are highly susceptible to freezing, leading to problems such as pipeline cracking and blockage. These issues can range from minor problems like distorted measurements and data deviations in thermal control instruments, causing misjudgments and malfunctions in the control system, affecting the accuracy of unit operation and regulation; to more serious problems like unplanned unit shutdowns, resulting in significant economic losses and potentially triggering safety accidents, severely threatening the safe operation of power plant personnel and equipment. Therefore, winter freeze protection for thermal control instrument pipelines is of paramount importance in power plant operation and maintenance.

[0004] Currently, most power plants in China use the traditional method of wrapping a single electric heating tape with an insulation layer to prevent freezing of thermal control instrument pipelines. However, the electric heating tape does not adhere well to the outer wall of the pipeline, and air gaps easily form between them, resulting in serious heat loss and a significant reduction in heat transfer efficiency. At the same time, local low-temperature blind spots can easily appear in the pipeline, making it impossible to achieve uniform freezing protection for the entire pipeline.

[0005] Therefore, the heat tracing system in the relevant technology suffers from high heat loss and low heat transfer efficiency. Summary of the Invention

[0006] The present invention aims to at least partially solve one of the technical problems in the related art.

[0007] Therefore, embodiments of the present invention propose a composite heat tracing system for instrument piping.

[0008] The instrument piping composite heat tracing system of this invention includes a piping body, a heat-conducting layer, a heat tracing tape, a composite insulation layer, and a protective shell.

[0009] The heat-conducting layer is fitted onto the main body of the pipe. In other words, the heat-conducting layer can be understood as a cylindrical structure fitted onto the main body of the pipe, meaning the inner wall of the heat-conducting layer is in contact with the outer wall of the main body of the pipe. Simultaneously, the heat tracing cable is embedded in a groove on the inner wall of the heat-conducting layer, and the heat tracing cable abuts against the main body of the pipe. A composite insulation layer is fitted onto the outside of the heat-conducting layer; and a protective outer shell is located outside the composite insulation layer.

[0010] It is understood that, on the outer surface of the instrument piping composite heat tracing system of the present invention, a heat-conducting layer, a composite insulation layer and a protective shell are arranged sequentially from the inside to the outside.

[0011] The heat tracing cable is embedded in the inner wall of the heat-conducting layer and abuts against the main body of the pipe. In other words, part of the outer surface (heat-generating surface) of the heat tracing cable abuts against the main body of the pipe, and there is no gap between the heat tracing cable and the main body of the pipe. The heat tracing cable can directly transfer heat to the main body of the pipe. The other part of the outer surface (heat-generating surface) of the heat tracing cable abuts against the heat-conducting layer, and there is no gap between the heat tracing cable and the heat-conducting layer. The heat tracing cable can transfer heat to the heat-conducting layer. At the same time, there is no gap between the heat-conducting layer and the main body of the pipe. The heat-conducting layer transfers heat to the main body of the pipe. This can greatly improve the heat transfer efficiency between the heat tracing cable and the main body of the pipe and greatly reduce heat loss.

[0012] Meanwhile, a composite insulation layer is provided on the outside of the heat-conducting layer. The composite insulation layer can prevent the heat of the heat-conducting layer from being transferred to the outside, so that the heat received by the heat-conducting layer can be transferred to the main body of the pipeline, which can further reduce heat loss.

[0013] Meanwhile, a protective outer shell is provided on the outside of the composite insulation layer. The protective outer shell can protect the main body of the instrument pipeline composite heat tracing system, the heat conduction layer, the heat tracing tape, and the composite insulation layer of the embodiment of the invention, so as to avoid damage to the main body of the instrument pipeline composite heat tracing system, the heat conduction layer, the heat tracing tape, and the composite insulation layer of the embodiment of the invention. In this way, the safety performance of the instrument pipeline composite heat tracing system of the embodiment of the invention can be improved and the service life of the instrument pipeline composite heat tracing system of the embodiment of the invention can be extended.

[0014] Meanwhile, the heat-conducting layer can evenly transfer heat to the main body of the pipeline, enabling more uniform heating of the pipeline body and further preventing the problem of excessively high local temperatures in the pipeline body.

[0015] Therefore, the instrument piping composite heat tracing system of this invention, by setting the above-mentioned heat-conducting layer, heat tracing tape, and composite insulation layer, can improve heat transfer efficiency, reduce heat loss, and extend service life.

[0016] Therefore, the instrument pipeline composite heat tracing system of this invention has the characteristics of high heat transfer efficiency and low heat loss.

[0017] In some embodiments, the embedding groove extends spirally along the axial direction of the pipeline body, and the heat tracing cable extends along the extension direction of the embedding groove.

[0018] In some embodiments, the thermally conductive layer is made of silicone.

[0019] In some embodiments, the composite insulation layer includes an aerogel layer and a polyurethane foam layer arranged sequentially from the inside to the outside along the radial direction of the pipeline body.

[0020] In some embodiments, the instrument piping composite heat tracing system of the present invention further includes a temperature sensor, which is disposed between the heat-conducting layer and the composite insulation layer.

[0021] In some embodiments, the temperature sensor is a patch-type temperature sensor.

[0022] In some embodiments, the instrument piping composite heat tracing system of the present invention further includes a temperature control system, the temperature control system including a control module, the control module being signal-connected to the temperature sensor and the heat tracing cable.

[0023] In some embodiments, the instrument pipeline composite heat tracing system of the present invention further includes a display module and an instruction receiving module, wherein the display module is signal-connected to the control module and the instruction receiving module is signal-connected to the display module.

[0024] In some embodiments, the protective housing includes a first arc plate and a second arc plate, the first arc plate and the second arc plate being connected end to end, and the first arc plate and the second arc plate being detachably connected by a snap fastener.

[0025] In some embodiments, at least one of the outer wall surface of the thermally conductive layer and the inner wall surface of the composite insulation layer is provided with a receiving groove for accommodating a temperature sensor. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the instrument piping composite heat tracing system according to an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Enlarged view of part A in the middle; Figure 3 This is a schematic diagram of the main body of the instrument piping composite heat tracing system and the heat tracing cable according to an embodiment of the present invention; Figure 4 This is a flow control diagram of the instrument piping composite heat tracing system according to an embodiment of the present invention.

[0028] Figure label: 1. Main body of the pipeline; 2. Thermal conductive layer; 201. Embedded groove; 3. Tropical zone; 4. Composite insulation layer; 401. Aerogel layer; 402. Polyurethane foam layer; 5. Protective outer shell; 501. First arc plate; 502. Second arc plate; 503. Buckle; 6. Temperature sensor; 8. Temperature control system; 801. Control module; 802. Display module; 803. Command receiving module; 9. Receiving tank. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] In order to solve the technical problems in related technologies, the present invention provides a composite heat tracing system for instrument pipelines.

[0031] like Figures 1-4 As shown, the instrument pipeline composite heat tracing system of this invention includes a pipeline body 1, a heat-conducting layer 2, a heat tracing tape 3, a composite insulation layer 4, and a protective shell 5.

[0032] The heat-conducting layer 2 is fitted onto the main body of the pipe 1. In other words, the heat-conducting layer 2 can be understood as a cylindrical structure fitted onto the main body of the pipe 1, meaning the inner wall of the heat-conducting layer 2 is in contact with the outer wall of the main body of the pipe 1. Simultaneously, the heat tracing cable 3 is embedded in the groove 201 on the inner wall of the heat-conducting layer 2, and the heat tracing cable 3 abuts against the main body of the pipe 1. The composite insulation layer 4 is fitted onto the outside of the heat-conducting layer 2; and the protective outer shell 5 is located on the outside of the composite insulation layer 4.

[0033] It is understood that, on the outer side of the pipe body 1 of the instrument pipeline composite heat tracing system in this embodiment of the invention, a heat-conducting layer 2, a composite insulation layer 4, and a protective shell 5 are sequentially arranged from the inside to the outside.

[0034] The heat tracing tape 3 is embedded in the inner wall of the heat-conducting layer 2 and abuts against the main pipe body 1. That is, part of the outer surface (heat-generating surface) of the heat tracing tape 3 abuts against the main pipe body 1, and there is no gap between the heat tracing tape 3 and the main pipe body 1. The heat tracing tape 3 can directly transfer heat to the main pipe body 1. The other part of the outer surface (heat-generating surface) of the heat tracing tape 3 abuts against the heat-conducting layer 2, and there is no gap between the heat tracing tape 3 and the heat-conducting layer 2. The heat tracing tape 3 can transfer heat to the heat-conducting layer 2. At the same time, there is no gap between the heat-conducting layer 2 and the main pipe body 1. The heat-conducting layer 2 transfers heat to the main pipe body 1. This can greatly improve the heat transfer efficiency between the heat tracing tape 3 and the main pipe body 1 and greatly reduce heat loss.

[0035] Meanwhile, a composite insulation layer 4 is provided on the outside of the heat-conducting layer 2. The composite insulation layer 4 can prevent the heat of the heat-conducting layer 2 from being transferred to the outside, so that the heat received by the heat-conducting layer 2 can be transferred to the main body of the pipeline 1, which can further reduce heat loss.

[0036] Meanwhile, a protective outer shell 5 is provided on the outside of the composite insulation layer 4. The protective outer shell 5 can protect the main body 1, heat conduction layer 2, heat tracing tape 3 and composite insulation layer 4 of the instrument pipeline composite heat tracing system of the present invention, so as to avoid damage to the main body 1, heat conduction layer 2, heat tracing tape 3 and composite insulation layer 4 of the instrument pipeline composite heat tracing system of the present invention, thereby improving the safety performance of the instrument pipeline composite heat tracing system of the present invention and extending the service life of the instrument pipeline composite heat tracing system of the present invention.

[0037] Meanwhile, the heat-conducting layer 2 can evenly transfer heat to the main body of the pipe 1, which can heat the main body of the pipe 1 more evenly and further avoid the problem of excessive local temperature of the main body of the pipe 1.

[0038] Therefore, the instrument pipeline composite heat tracing system of this invention, by setting the above-mentioned heat-conducting layer 2, heat tracing tape 3, and composite insulation layer 4, can improve heat transfer efficiency, reduce heat loss, and extend service life.

[0039] Therefore, the instrument pipeline composite heat tracing system of this invention has the characteristics of high heat transfer efficiency and low heat loss.

[0040] In some embodiments, the embedding groove 201 extends spirally along the axial direction of the pipeline body 1, and the heat tracing cable 3 extends along the extension direction of the embedding groove 201.

[0041] It is understandable that by spirally extending the embedding groove 201 along the axial direction of the pipeline body 1, when the heating tape 3 is embedded in the embedding groove 201, the heating tape 3 is arranged to extend along the extension direction of the embedding groove 201. That is to say, the heating tape 3 spirally extends along the axial direction of the pipeline body 1 and is wrapped around the outer surface of the pipeline body 1. This can evenly heat the pipeline body 1 and thus avoid the problem of excessive local temperature of the pipeline body 1.

[0042] In some embodiments, the thermally conductive layer 2 is made of silicone.

[0043] It is understandable that silicone has excellent thermal conductivity, so the heat transferred from the heating tape 3 to the heat-conducting layer 2 can be evenly transferred to the main body of the pipe 1, which can heat the main body of the pipe 1 more evenly and further avoid the problem of excessive local temperature of the main body of the pipe 1.

[0044] In some embodiments, the composite insulation layer 4 includes an aerogel layer 401 and a polyurethane foam layer 402 arranged sequentially from the inside to the outside along the radial direction of the pipeline body 1.

[0045] It is understandable that the aerogel layer 401 and the polyurethane foam layer 402 can be connected by a high-temperature resistant adhesive. In other words, a high-temperature resistant adhesive is provided between the outer wall surface of the aerogel layer 401 and the inner wall surface of the polyurethane foam layer 402, which can prevent the aerogel layer 401 and the polyurethane foam layer 402 from separating.

[0046] Meanwhile, the composite insulation layer 4 is configured to include an aerogel layer 401 and a polyurethane foam layer 402 arranged sequentially from the inside out. The aerogel layer 401 has an extremely low thermal conductivity, and the polyurethane foam layer 402 has good moisture-proof performance. On the one hand, the aerogel layer 401 can reduce the loss of heat to the outside of the pipeline body 1, improve the heat tracing effect and reduce the energy consumption of the heat tracing cable 3. On the other hand, the polyurethane foam layer 402 can isolate the intrusion of external water vapor, prevent water vapor from condensing on the surface of the pipeline body 1 or the heat tracing cable 3 and corroding the components, and ensure that the instrument pipeline composite heat tracing system of this embodiment can operate stably for a long time.

[0047] In some embodiments, the instrument pipeline composite heat tracing system of the present invention further includes a temperature sensor 6, which is disposed between the heat-conducting layer 2 and the composite insulation layer 4.

[0048] It is understandable that a temperature sensor 6 is installed between the heat-conducting layer 2 and the composite insulation layer 4, that is, between the outer wall surface of the heat-conducting layer 2 and the inner wall surface of the composite insulation layer 4.

[0049] Furthermore, the temperature sensor 6 is disposed between the thermally conductive layer 2 and the aerogel layer 401.

[0050] Therefore, the temperature sensor 6 can collect the temperature of the heat-conducting layer 2. Since the heat-conducting layer 2 is attached to the pipe body 1, the heat-conducting layer 2 can accurately reflect the temperature data of the pipe body 1. On the one hand, it can enable the temperature sensor to accurately collect the temperature data of the pipe body 1. On the other hand, it can avoid the problem of reduced heat transfer efficiency caused by gaps between the heat-conducting layer 2 and the pipe body 1 when it is directly placed on the pipe body 1.

[0051] Therefore, by setting a temperature sensor 6 between the heat-conducting layer 2 and the composite insulation layer 4, the temperature data of the pipeline body 1 can be collected, so as to control the temperature of the pipeline body 1.

[0052] In some embodiments, the temperature sensor 6 is a patch-type temperature sensor 6.

[0053] It is understandable that by setting the temperature sensor 6 as a patch-type temperature sensor, it can better fit the outer wall surface of the heat-conducting layer 2 and the inner wall surface of the composite insulation layer 4, without affecting the adhesion between the composite insulation layer 4 and the heat-conducting layer 2. This avoids the problem of reduced heat transfer efficiency caused by setting the temperature sensor 6. At the same time, the patch-type sensor occupies little space and will not cause an excessive increase in the overall volume of the instrument pipeline composite heat tracing system in this embodiment of the invention.

[0054] In some embodiments, the instrument pipeline composite heat tracing system of the present invention further includes a temperature control system 8, the temperature control system 8 includes a control module 801, the control module 801 is signal-connected to the temperature sensor 6, and the control module 801 is signal-connected to the heat tracing tape 3.

[0055] It is understandable that the control module 801 is connected to the temperature sensor 6, and the temperature sensor 6 can transmit the temperature data it collects to the control module 801. The control module 801 is connected to the heating cable 3, and the control module 801 can control the heating power of the heating cable 3 according to the temperature data. For example, when the collected temperature is lower than the preset lower limit, the control module 801 can increase the heating power of the heating cable 3. When the collected temperature is higher than the preset upper limit, the control module 801 can reduce the heating power of the heating cable 3 or turn off the heating cable 3, thereby realizing the automatic regulation of pipeline temperature.

[0056] In some embodiments, the instrument pipeline composite heat tracing system of the present invention further includes a display module 802 and an instruction receiving module 803. The display module 802 is signal-connected to the control module 801, and the instruction receiving module 803 is signal-connected to the display module 802.

[0057] It is understandable that the display module 802 can be a display screen, and the instruction receiving module 803 can be a keyboard. The user can set a preset temperature range or a preset temperature value through the keyboard. At the same time, the keyboard can also transmit the preset temperature range and preset temperature value set by the user to the control module 801. The corresponding display screen can display the preset temperature range or preset temperature value set by the user, and can also display the temperature data collected by the temperature sensor 6.

[0058] In some embodiments, at least one of the outer wall surface of the thermally conductive layer 2 and the inner wall surface of the composite insulation layer 4 is provided with a receiving groove 9 for accommodating the temperature sensor 6.

[0059] In other words, a receiving groove 9 can be provided on the outer wall surface of the heat-conducting layer 2 and on the inner wall surface of the composite insulation layer 4. Correspondingly, receiving grooves 9 can be provided on both the outer wall surface of the heat-conducting layer 2 and the inner wall surface of the composite insulation layer 4. The receiving grooves 9 on the outer wall surface of the heat-conducting layer 2 and the receiving grooves 9 on the inner wall surface of the composite insulation layer 4 can be provided correspondingly to form a larger receiving groove 9.

[0060] Specifically, a receiving groove 9 can be provided on the outer wall surface of the heat-conducting layer 2, and a receiving groove 9 can be provided on the inner wall surface of the aerogel layer 401. Correspondingly, receiving grooves 9 can be provided on both the outer wall surface of the heat-conducting layer 2 and the inner wall surface of the aerogel layer 401. The receiving grooves 9 on the outer wall surface of the heat-conducting layer 2 and the receiving grooves 9 on the inner wall surface of the aerogel layer 401 can be provided correspondingly to form a larger receiving groove 9, which can accommodate a larger temperature sensor 6 without taking up additional space.

[0061] It is understandable that housing the probe of temperature sensor 6 within the receiving slot 9 will not require additional external space. Correspondingly, multiple temperature sensors 6 can be set, and multiple temperature sensors 6 are arranged at intervals along the axial direction of the heat-conducting layer 2, which can collect the temperature of the heat-conducting layer 2 and the pipeline body 1 more evenly.

[0062] The corresponding multiple receiving slots 9 are also arranged at intervals along the axial direction of the heat-conducting layer 2. Each temperature sensor 6 is placed in the corresponding receiving slot 9. This ensures that the temperature acquisition positions do not interfere with each other and does not increase the overall volume of the heat tracing system. It can improve the accuracy and comprehensiveness of temperature acquisition while maintaining the original system structure size, which is convenient for subsequent precise control of the heating power of the heat tracing tape 3.

[0063] In some embodiments, the protective housing 5 includes a first arc plate 501 and a second arc plate 502, the first arc plate 501 and the second arc plate 502 are connected end to end, and the first arc plate 501 and the second arc plate 502 are detachably connected by a buckle 503.

[0064] It is understandable that the first arc plate 501 and the second arc plate 502, when connected end to end, can form a cylindrical structure that wraps around the composite insulation layer 4, thus protecting the composite insulation layer 4 and preventing damage to it.

[0065] By detachably connecting the first arc plate 501 and the second arc plate 502 through the buckle 503, it is convenient to disassemble the first arc plate 501 and the second arc plate 502, thereby improving the ease of use of the instrument pipeline composite heat tracing system of the present invention embodiment.

[0066] Understandably, when it is necessary to inspect or replace the temperature sensor 6 and the heating tape 3, the first arc plate 501 and the second arc plate 502 can be directly opened by opening the clip 503, which reduces maintenance costs and inspection difficulty, and further improves the maintainability of the system.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A composite heat tracing system for instrument piping, characterized in that, include: Pipeline body (1) A heat-conducting layer (2) is sleeved on the main body of the pipeline (1); The heat tracing cable (3) is embedded in the groove (201) on the inner wall of the heat-conducting layer (2), and the heat tracing cable (3) abuts against the main body of the pipeline (1); A composite insulation layer (4) is fitted over the outside of the heat-conducting layer (2); The protective shell (5) is located on the outside of the composite insulation layer (4).

2. The instrument piping composite heat tracing system according to claim 1, characterized in that, The embedding groove (201) extends spirally along the axial direction of the pipeline body (1), and the heat tracing cable (3) extends along the extension direction of the embedding groove (201).

3. The instrument piping composite heat tracing system according to claim 1, characterized in that, The thermal conductive layer (2) is made of silicone.

4. The instrument piping composite heat tracing system according to claim 1, characterized in that, The composite insulation layer (4) includes an aerogel layer (401) and a polyurethane foam layer (402) arranged sequentially from the inside to the outside along the radial direction of the pipeline body (1).

5. The instrument piping composite heat tracing system according to claim 1, characterized in that, It also includes a temperature sensor (6), which is disposed between the heat-conducting layer (2) and the composite insulation layer (4).

6. The instrument piping composite heat tracing system according to claim 5, characterized in that, The temperature sensor (6) is a patch-type temperature sensor (6).

7. The instrument piping composite heat tracing system according to claim 5, characterized in that, It also includes a temperature control system (8), which includes a control module (801), which is signal-connected to the temperature sensor (6) and the heat tracing cable (3).

8. The instrument piping composite heat tracing system according to claim 7, characterized in that, It also includes a display module (802) and an instruction receiving module (803), wherein the display module (802) is signal-connected to the control module (801), and the instruction receiving module (803) is signal-connected to the display module (802).

9. The instrument piping composite heat tracing system according to claim 1, characterized in that, The protective shell (5) includes a first arc plate (501) and a second arc plate (502), the first arc plate (501) and the second arc plate (502) are connected end to end, and the first arc plate (501) and the second arc plate (502) are detachably connected by a buckle (503).

10. The instrument piping composite heat tracing system according to claim 5, characterized in that, At least one of the outer wall surface of the heat-conducting layer (2) and the inner wall surface of the composite insulation layer (4) is provided with a receiving groove (9) for accommodating the temperature sensor (6).

Images