A creep monitoring device and method for high temperature pipelines in power plants

Abstract

The present invention discloses a creep monitoring device and a monitoring method for a high-temperature pipeline of a power station. The monitoring device comprises a shell A, a solar spectrum simulation lamp, a movable partition, a shell B, a pipeline and a photovoltaic module; the shell A is connected to the shell B, the shell B is fixed on the pipeline, the movable partition is arranged on the shell B, the outer surface of the pipeline is coated with a high-absorption rate flexible nano coating, the outer surface of the high-absorption rate flexible nano coating is coated with a high-reflectivity brittle nano coating, the photovoltaic module is arranged in front of the pipeline, the back of the photovoltaic module is provided with a photovoltaic module heat dissipation device, the solar spectrum simulation lamp is arranged in front of the side of the pipeline, and the back of the solar spectrum simulation lamp is provided with a solar spectrum simulation lamp heat dissipation device. The present invention utilizes optical principles and solar power generation principles, utilizes the reflection and absorption characteristics of visible light and the principle of photoelectric conversion in an isolated space, and monitors the creep of the pipeline by measuring the change in the quantity of visible light, thereby realizing automation and online monitoring functions.

Description

Technical Field

[0001] The present invention relates to the fields of detection technology, and in particular to a creep monitoring device and a monitoring method for a high-temperature pipeline in a power station. Background Art

[0002] Under long-term operation conditions, high-temperature pipelines in power plants will suffer from high-temperature creep damage. If not discovered in time, serious accidents will occur. For creep monitoring of high-temperature pipelines, caliper measurement or metallographic inspection and evaluation methods are generally used in shutdown state. However, metallographic evaluation is a qualitative method and cannot quantitatively evaluate creep damage. Therefore, it is of great practical significance to seek a method for online monitoring of creep damage of high-temperature pipelines.

[0003] The relevant patents currently published mainly include:

[0004] 1) The Chinese patent No. 200910249625.0, the on-site automatic detection and alarm device for creep damage of the main steam pipeline, solves the problem of automatic detection and alarm for creep damage of the P92 main steam pipeline, and is particularly suitable for real-time early warning of creep damage of the main steam pipeline. Summary of the invention

[0005] The high-temperature pipelines of power stations will produce creep damage when operating at high temperatures for a long time, which is manifested in the creep of the pipelines, causing microscopic changes on the outer surface. The microscopic changes of pipelines under high-temperature operation cannot be detected by contact, and the surface of metal pipelines is prone to rust, which is not easy to observe directly. The purpose of the present invention is to overcome the above-mentioned shortcomings in the prior art and provide a high-temperature pipeline creep monitoring method and monitoring device, which can realize online monitoring of the creep of high-temperature pipelines.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problem is: a creep monitoring device for a high-temperature pipeline in a power station, characterized in that it includes a shell A, a solar spectrum simulation lamp, a movable partition, a shell B, a pipeline and a photovoltaic module; the shell A is connected to the shell B through a shell flange, the shell B is fixed on the pipeline, and the movable partition is arranged on the shell B to protect the measuring device from high temperature damage during non-monitoring periods; the outer surface of the pipeline is coated with a high-absorption flexible nano-coating, the high-absorption flexible nano-coating is a coating made of a nano-material with the characteristic of absorbing visible light, has the function of absorbing most of the visible light, and has good toughness and high-temperature resistance; the outer surface of the high-absorption flexible nano-coating is coated with a high-reflectivity brittle nano-coating, the high-reflectivity brittle nano-coating is a coating made of a nano-material with the characteristic of reflecting visible light, has the function of reflecting most of the visible light. The photovoltaic module has the function of seeing light, and has certain brittleness and high temperature resistance; the photovoltaic module is arranged in front of the pipeline, the photovoltaic module is fixed on the shell body through a photovoltaic module fixing device, and a photovoltaic module heat dissipation device is arranged on the back of the photovoltaic module, the photovoltaic module is used to convert the absorbed visible light into electrical energy, and the photovoltaic module heat dissipation device is used to reduce the temperature of the photovoltaic module, so that the photoelectric conversion efficiency of the photovoltaic module is not affected by temperature; the solar spectrum simulation lamp is arranged in the front side of the pipeline, the solar spectrum simulation lamp is fixed on the shell body through a solar spectrum simulation lamp fixing device, and a solar spectrum simulation lamp heat dissipation device is arranged on the back of the solar spectrum simulation lamp, the radiation spectrum emitted by the solar spectrum simulation lamp is close to the solar energy spectrum, and the solar spectrum simulation lamp heat dissipation device is used to reduce the temperature of the solar spectrum simulation lamp, so that the electro-optical conversion efficiency of the solar spectrum simulation lamp is not affected by temperature.

[0007] Furthermore, it also includes a power meter, which is connected to the photovoltaic module through a power line. The power meter is used to collect the output power of the photovoltaic module and transmit the data to the DCS system.

[0008] Furthermore, the photovoltaic module heat dissipation device includes a heat pipe A, an axial flow fan A and a bellows A, wherein the heat pipe A is connected to the bellows A, the axial flow fan A is arranged on the bellows A, and the heat pipe A is a heat conducting element.

[0009] Furthermore, it also includes a temperature measuring element A and a temperature measuring element B, which are respectively arranged on the back of the photovoltaic module. The axial flow fan A adjusts the output power according to the measurement data of the temperature measuring element A and the temperature measuring element B, thereby controlling the heat dissipation to ensure that the photovoltaic module is in a suitable temperature range; the axial flow fan A has a frequency conversion function.

[0010] Furthermore, the solar spectrum simulation lamp is arranged at the focus of the parabolic concentrator, an irradiance sensor is arranged on the solar spectrum simulation lamp, the radiation spectrum emitted by the solar spectrum simulation lamp is close to the solar energy spectrum, and has a variable frequency regulation function.

[0011] Furthermore, the heat dissipation device of the solar spectrum simulation lamp includes a second heat pipe, a second axial flow fan and a second bellows. The second heat pipe is connected to the second bellows, the second axial flow fan is arranged on the second bellows, and the second heat pipe is a heat-conducting element.

[0012] Working principle: In an isolated space, a light source is set to generate constant radiation energy. The nano coating applied to the high-temperature pipeline has certain absorption or reflection characteristics. Part of the radiation energy generated by the light source is reflected by the nano coating, and part is absorbed by the nano coating. As the pipeline creeps at high temperatures, microscopic changes occur, which in turn change the absorption or reflection characteristics of the nano coating, resulting in changes in the amount of radiation energy reflected or absorbed in the isolated space. The creep of the pipeline is monitored by measuring this change.

[0013] Monitoring methods:

[0014] During the non-monitoring period, the movable partition is moved to the inside of the B shell to isolate the solar spectrum simulation lamp and the photovoltaic module from the pipeline to protect the monitoring device from high temperature damage. At this time, the solar spectrum simulation lamp is in a turned-off state;

[0015] During the monitoring period, the movable partition is moved to the outside of the B shell. The visible light generated by the solar spectrum simulation lamp is converted into parallel light by the parabolic concentrator and irradiated onto the pipeline. After the parallel light is reflected by the high-reflectivity brittle nano-coating on the outermost side of the pipeline, part of the light is irradiated on the photovoltaic module, causing the photovoltaic module to generate electrical energy and the output power is measured by the power meter. When the pipeline creeps, the pipeline gradually undergoes microscopic changes (for example, swelling), and the high-absorption flexible nano-coating on the outer surface of the pipeline undergoes plastic extension as the pipeline changes, and the outermost high-reflectivity brittle nano-coating undergoes brittle failure. Therefore, when parallel light is irradiated onto the pipeline, part of the light is absorbed by the high-absorption flexible nano-coating through the high-reflectivity brittle nano-coating, and the other part of the light is reflected by the high-reflectivity brittle nano-coating, resulting in a reduction in the amount of light irradiated on the photovoltaic module, which reduces the output power of the photovoltaic module. The creep of the pipeline is judged based on the reduction in the output power of the photovoltaic module.

[0016] In addition, during the monitoring period, temperature measuring element A and temperature measuring element B measure the temperature of the photovoltaic module and transmit the data to the DCS system; when the temperature of the photovoltaic module exceeds a reasonable range, axial flow fan A with frequency conversion function starts to reduce the temperature of the photovoltaic module to a reasonable range; the irradiance sensor measures the radiation intensity emitted by the solar spectrum simulation lamp and transmits the data to the DCS system; when the radiation intensity emitted by the solar spectrum simulation lamp decreases, axial flow fan B starts to dissipate heat for the solar spectrum simulation lamp.

[0017] Compared with the prior art, the present invention has the following advantages and effects: the present invention utilizes optical principles and solar power generation principles, utilizes the reflection and absorption characteristics of visible light and the principle of photoelectric conversion in an isolated space, and monitors the creep of the pipeline by measuring the change in the amount of visible light, thereby realizing automation and online monitoring functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is a schematic diagram of a top view of the structure of a monitoring device in an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the main structure of the monitoring device in the embodiment of the present invention.

[0020] Figure 3 Schematic diagram of the structure of the housing in the embodiment of the present invention.

[0021] Figure 4 Schematic diagram of the structure of a photovoltaic module in an embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the heat dissipation device of the photovoltaic module in the embodiment of the present invention.

[0023] Figure 6 Schematic diagram of the structure of the solar spectrum simulation lamp in the embodiment of the present invention.

[0024] In the figure: shell A 1, solar spectrum simulation lamp fixture 2, solar spectrum simulation lamp heat dissipation device 3, parabolic concentrator 4, solar spectrum simulation lamp 5, irradiance sensor 6, shell flange 7, movable partition 8, shell B 9, high reflectivity brittle nano coating 10, high absorption rate flexible nano coating 11, pipeline 12, photovoltaic module heat dissipation device 13, photovoltaic module fixture 14, photovoltaic module 15, A temperature measuring element 16, power meter 17, power cord 18, B temperature measuring element 19, A heat pipe 20, A bellows 21, A axial flow fan 22, B heat pipe 23, B axial flow fan 24, B bellows 25, shell reflection layer 26, shell insulation layer 27, shell absorption layer 28. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0026] Example

[0027] See also Figures 1 to 6 In this embodiment, a creep monitoring device for a high-temperature pipeline in a power station includes a shell A 1, a solar spectrum simulation lamp 5, a movable partition 8, a shell B 9, a pipeline 12 and a photovoltaic module 15; the shell A 1 is connected to the shell B 9 through a shell flange 7, the shell B 9 is fixed on the pipeline 12, and the movable partition 8 is arranged on the shell B 9 to protect the measuring device from high temperature damage during non-monitoring periods; the outer surface of the pipeline 12 is coated with a high-absorption flexible nano-coating 11, which is a coating made of a nano-material with a visible light absorption characteristic, has the function of absorbing most of the visible light, and has good toughness and high temperature resistance; the outer surface of the high-absorption flexible nano-coating 11 is coated with a high-reflectivity brittle nano-coating 10, which is a coating made of a nano-material with a visible light reflection characteristic, has the function of reflecting most of the visible light, and has good toughness and high temperature resistance. Certain brittleness and high temperature resistance; the photovoltaic component 15 is arranged in front of the pipeline 12, and the photovoltaic component 15 is fixed on the shell body 1 through the photovoltaic component fixing device 14. The back of the photovoltaic component 15 is provided with a photovoltaic component heat dissipation device 13. The photovoltaic component 15 is used to convert the absorbed visible light into electrical energy. The photovoltaic component heat dissipation device 13 is used to reduce the temperature of the photovoltaic component 15, so that the photoelectric conversion efficiency of the photovoltaic component 15 is not affected by temperature; the solar spectrum simulation lamp 5 is arranged in the front side of the pipeline 12, and the solar spectrum simulation lamp 5 is fixed on the shell body 1 through the solar spectrum simulation lamp fixing device 2. The back of the solar spectrum simulation lamp 5 is provided with a solar spectrum simulation lamp heat dissipation device 3. The radiation spectrum emitted by the solar spectrum simulation lamp 5 is close to the solar energy spectrum. The solar spectrum simulation lamp heat dissipation device 3 is used to reduce the temperature of the solar spectrum simulation lamp 5, so that the electro-optical conversion efficiency of the solar spectrum simulation lamp 5 is not affected by temperature.

[0028] In this embodiment, a power meter 17 is also included. The power meter 17 is connected to the photovoltaic module 15 through a power line 18. The power meter 17 is used to collect the output power of the photovoltaic module 15 and transmit the data to the DCS system.

[0029] In this embodiment, the photovoltaic module heat dissipation device 13 includes a heat pipe A 20, an axial flow fan A 22 and a bellows A 21. The heat pipe A 20 is connected to the bellows A 21. The axial flow fan A 22 is arranged on the bellows A 21. The heat pipe A 20 is a heat conducting element.

[0030] In this embodiment, it also includes a temperature measuring element A 16 and a temperature measuring element B 19. The temperature measuring element A 16 and the temperature measuring element B 19 are respectively arranged on the back of the photovoltaic module 15. The axial flow fan A 22 adjusts the output power according to the measurement data of the temperature measuring element A 16 and the temperature measuring element B 19, thereby controlling the heat dissipation to ensure that the photovoltaic module 15 is within a suitable temperature range; the axial flow fan A 22 has a frequency conversion function.

[0031] In this embodiment, the solar spectrum simulation lamp 5 is arranged at the focus of the parabolic concentrator 4. An irradiance sensor 6 is arranged on the solar spectrum simulation lamp 5. The radiation spectrum emitted by the solar spectrum simulation lamp 5 is close to the solar energy spectrum and has a frequency conversion regulation function.

[0032] In this embodiment, the heat dissipation device 3 of the solar spectrum simulation lamp includes a second heat pipe 23, a second axial flow fan 24 and a second bellows 25. The second heat pipe 23 is connected to the second bellows 25. The second axial flow fan 24 is arranged on the second bellows 25. The second heat pipe 23 is a heat conducting element.

[0033] In this embodiment, the wall surfaces of the shell A 1 and the shell B 9 are composed of a shell reflection layer 26 , a shell heat insulation layer 27 and a shell absorption layer 28 .

[0034] Monitoring methods:

[0035] During the non-monitoring period, the movable partition 8 is moved to the inside of the B shell 9 to isolate the solar spectrum simulation lamp 5 and the photovoltaic assembly 15 from the pipeline 12 to protect the monitoring device from high temperature damage. At this time, the solar spectrum simulation lamp 5 is in a closed state;

[0036] During the monitoring period, the movable partition 8 is moved to the outside of the B shell 9, and the visible light generated by the solar spectrum simulation lamp 5 is converted into parallel light by the parabolic concentrator 4 and irradiated onto the pipe 12. After the parallel light is reflected by the high-reflectivity brittle nano-coating 10 on the outermost side of the pipe 12, part of the light is irradiated onto the photovoltaic module 15, so that the photovoltaic module 15 generates electrical energy and the output power is measured by the power meter 17. When the pipe 12 creeps, the pipe 12 gradually undergoes microscopic changes (for example, expansion), and the high-absorption flexible nano-coating on the outer surface of the pipe 12 Layer 11 undergoes plastic extension as the pipeline 12 changes, and the outermost high-reflectivity brittle nanocoating 10 undergoes brittle failure. As a result, when parallel light is irradiated onto the pipeline 12, part of the light is absorbed by the high-reflectivity brittle nanocoating 10 and the high-absorption flexible nanocoating 11, and the other part of the light is reflected by the high-reflectivity brittle nanocoating 10, resulting in a reduction in the amount of light irradiated on the photovoltaic module 15, which reduces the output power of the photovoltaic module 15. The creep condition of the pipeline 12 is judged based on the reduction in the output power of the photovoltaic module 15.

[0037] In addition, during the monitoring period, the temperature measuring element A 16 and the temperature measuring element B 19 measure the temperature of the photovoltaic module 15 and transmit the data to the DCS system; when the temperature of the photovoltaic module 15 exceeds a reasonable range, the axial flow fan A 22 with a frequency conversion function starts to reduce the temperature of the photovoltaic module 15 to a reasonable range; the irradiance sensor 6 measures the radiation intensity emitted by the solar spectrum simulation lamp 5 and transmits the data to the DCS system; when the radiation intensity emitted by the solar spectrum simulation lamp 5 decreases, the axial flow fan B 24 starts to dissipate heat for the solar spectrum simulation lamp 5.

[0038] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0039] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the protection scope of the present invention. Any changes and modifications made by any technician familiar with the technology without departing from the concept and scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A creep monitoring device for high temperature pipelines in power plants, characterized in that: The invention comprises a housing A (1), a solar spectrum simulation lamp (5), a movable partition (8), a housing B (9), a pipeline (12) and a photovoltaic module (15); the housing A (1) and the housing B (9) are connected via a housing flange (7); the housing B (9) is fixed on the pipeline (12); the movable partition (8) is arranged on the housing B (9) to protect the measuring device from high temperature damage during non-monitoring periods; the outer surface of the pipeline (12) is coated with a high-absorption rate flexible nano-coating (11); the high-absorption rate flexible nano-coating (11) has the function of absorbing most of the visible light, and has good toughness and high temperature resistance; the outer surface of the high-absorption rate flexible nano-coating (11) is coated with a high-reflectivity brittle nano-coating (10); the high-reflectivity brittle nano-coating (10) has the function of reflecting most of the visible light, and has certain brittleness and high temperature resistance; the photovoltaic module (15) is arranged on the pipeline ( The photovoltaic module (15) is arranged in front of the pipe (12), the photovoltaic module (15) is fixed to the shell (1) by a photovoltaic module fixing device (14), the back of the photovoltaic module (15) is provided with a photovoltaic module heat dissipation device (13), the photovoltaic module (15) is used to convert the absorbed visible light into electrical energy, the photovoltaic module heat dissipation device (13) is used to reduce the temperature of the photovoltaic module (15), so that the photoelectric conversion efficiency of the photovoltaic module (15) is not affected by temperature; the solar spectrum simulation lamp (5) is arranged in front of the side of the pipe (12), the solar spectrum simulation lamp (5) is fixed to the shell (1) by a solar spectrum simulation lamp fixing device (2), the back of the solar spectrum simulation lamp (5) is provided with a solar spectrum simulation lamp heat dissipation device (3), the solar spectrum simulation lamp heat dissipation device (3) is used to reduce the temperature of the solar spectrum simulation lamp (5), so that the electro-optical conversion efficiency of the solar spectrum simulation lamp (5) is not affected by temperature.

2. The creep monitoring device for high temperature pipelines in power plants according to claim 1 is characterized in that: It also includes a power meter (17), the power meter (17) being connected to the photovoltaic assembly (15) via a power line (18), the power meter (17) being used to collect output power of the photovoltaic assembly (15) and transmit data to a DCS system.

3. The creep monitoring device for high temperature pipelines in power plants according to claim 1 is characterized in that: The photovoltaic module heat dissipation device (13) comprises a heat pipe (20), an axial flow fan (22) and a bellows (21); the heat pipe (20) is connected to the bellows (21); the axial flow fan (22) is arranged on the bellows (21); and the heat pipe (20) is a heat conducting element.

4. The creep monitoring device for high temperature pipelines in power plants according to claim 3 is characterized in that: It also includes a temperature measuring element A (16) and a temperature measuring element B (19), wherein the temperature measuring element A (16) and the temperature measuring element B (19) are respectively arranged on the back of the photovoltaic module (15); the axial flow fan A (22) adjusts the output power according to the measurement data of the temperature measuring element A (16) and the temperature measuring element B (19), thereby controlling the heat dissipation and ensuring that the photovoltaic module (15) is within a suitable temperature range; the axial flow fan A (22) has a frequency conversion function.

5. The creep monitoring device for high temperature pipelines in power plants according to claim 1 is characterized in that: The solar spectrum simulation lamp (5) is arranged at the focus of a parabolic concentrator (4), an irradiance sensor (6) is arranged on the parabolic concentrator (4), and the solar spectrum simulation lamp (5) has a variable frequency regulation function.

6. The creep monitoring device for high temperature pipelines in power plants according to claim 1 is characterized in that: The solar spectrum simulation lamp heat dissipation device (3) comprises a second heat pipe (23), a second axial flow fan (24) and a second bellows (25); the second heat pipe (23) is connected to the second bellows (25); the second axial flow fan (24) is arranged on the second bellows (25); and the second heat pipe (23) is a heat conducting element.

7. A monitoring method for a creep monitoring device for a high temperature pipeline in a power station as claimed in any one of claims 1 to 6, characterized in that the process as follows: During the non-monitoring period, the movable partition (8) is moved to the inside of the second shell (9) to isolate the solar spectrum simulation lamp (5) and the photovoltaic assembly (15) from the pipeline (12) to protect the monitoring device from damage by high temperature. At this time, the solar spectrum simulation lamp (5) is in a turned-off state; During the monitoring period, the movable partition (8) is moved to the outside of the second shell (9), and the visible light generated by the solar spectrum simulation lamp (5) is converted into parallel light by the parabolic concentrator (4) and irradiated onto the pipe (12). After the parallel light is reflected by the high-reflectivity brittle nano-coating (10) on the outermost side of the pipe (12), part of the light is irradiated onto the photovoltaic module (15), so that the photovoltaic module (15) generates electrical energy and the output power is measured by the power meter (17). When the pipe (12) undergoes creep, the pipe (12) gradually undergoes microscopic changes, and the high-absorption flexible nano-coating ( 11) undergoes plastic extension as the pipe (12) changes, and the outermost high-reflectivity brittle nano-coating (10) undergoes brittle failure. As a result, when parallel light is irradiated onto the pipe (12), part of the light is transmitted through the high-reflectivity brittle nano-coating (10) and absorbed by the high-absorption flexible nano-coating (11), and another part of the light is reflected by the high-reflectivity brittle nano-coating (10), resulting in a reduction in the amount of light irradiated onto the photovoltaic module (15), thereby reducing the output power of the photovoltaic module (15). The creep condition of the pipe (12) is determined based on the reduction in the output power of the photovoltaic module (15).

8. The monitoring method of the creep monitoring device for high temperature pipelines in power plants according to claim 7 is characterized in that: During the monitoring period, the temperature measuring element A (16) and the temperature measuring element B (19) measure the temperature of the photovoltaic module (15) and transmit the data to the DCS system; when the temperature of the photovoltaic module (15) exceeds a reasonable range, the axial flow fan A (22) with a frequency conversion function starts to reduce the temperature of the photovoltaic module (15) to a reasonable range; the irradiance sensor (6) measures the radiation intensity emitted by the solar spectrum simulation lamp (5) and transmits the data to the DCS system; when the radiation intensity emitted by the solar spectrum simulation lamp (5) decreases, the axial flow fan B (24) starts to dissipate heat for the solar spectrum simulation lamp (5).

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