Distributed measuring device for surface temperature of boiler pipeline

Abstract

The invention discloses a boiler pipeline surface temperature distributed measuring device, and belongs to the technical field of industrial heat energy equipment monitoring. In order to solve the problems that the contact pressure of a sensing optical fiber is unstable due to thermal deformation of a boiler pipeline, and the temperature measurement and the reliability are influenced due to the fact that the optical fiber is easy to loosen in long-term operation, two ends of the sensing optical fiber are electrically connected with a signal demodulator and a terminal splice closure respectively and laid along the surface of the boiler pipeline; the optical fiber fixing assemblies are arranged on the surface of the boiler pipeline at intervals, each optical fiber fixing assembly comprises a positioning ring and a bottom frame which are matched for use, and the sensing optical fiber is arranged between the positioning ring and the surface of the boiler pipeline; a heat conduction cavity is formed in the bottom frame, vertical holes communicating with the interior of the heat conduction cavity are formed in the positions, close to the two end faces of the positioning ring, of the top face in the heat conduction cavity, and bimetallic plates are arranged at the positions of the vertical holes. And the optical fiber tensioning assembly is arranged at the end part of the boiler pipeline and is used for applying preset tension to the sensing optical fiber and maintaining the preset tension. The device is used for boiler pipeline temperature measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to a boiler pipeline surface temperature distribution measurement device, belonging to the technical field of industrial heat equipment monitoring. BACKGROUND

[0002] In the industrial fields of thermal power generation, chemical production, etc., as the core heat equipment, the safety and efficiency of the boiler operation are of great importance. The boiler pipeline, especially the superheater and reheater pipeline, is long-term under the harsh working conditions of high temperature and high pressure, and is prone to material performance degradation due to local overheating, and even to serious accidents such as pipe explosion. Therefore, real-time and accurate monitoring of the surface temperature of the boiler pipeline is a necessary means to ensure the long-term safe and stable operation of the equipment and to prevent accidents.

[0003] At present, the temperature measurement of the boiler generally adopts a point-type temperature measurement method such as a thermocouple. This kind of method can only obtain the temperature information of a limited number of discrete points on the surface of the pipeline, and it is difficult to comprehensively and continuously reflect the temperature field distribution of the entire pipeline system, and there is a monitoring blind area. In actual operation, due to factors such as combustion fluctuation, ash deposition, and uneven fluid distribution, local overheating of the pipeline is prone to occur, and the traditional point-type temperature measurement method often cannot timely capture such abnormalities, posing a safety hazard.

[0004] The distributed optical fiber temperature measurement technology provides a potential solution to the above problems with its outstanding advantages of continuous spatial measurement, anti-electromagnetic interference, and intrinsic safety. This technology can realize continuous temperature sensing along the optical fiber path, and theoretically can cover the entire pipeline to achieve comprehensive monitoring of the temperature field and timely identification of local overheating areas.

[0005] However, when applying the distributed optical fiber temperature measurement technology to the special scene of the boiler pipeline, there are several key technical challenges:

[0006] 1. Influence of pipeline thermal deformation: During the start and stop of the boiler, the pipeline will produce significant axial and radial deformation due to thermal expansion and contraction. This deformation will cause a gap or an over-tight state between the pre-laid optical fiber and the surface of the pipeline, resulting in unstable contact pressure between the optical fiber and the surface of the pipeline. This will not only introduce significant temperature measurement errors, but in severe cases, it may even lead to a decrease in signal transmission quality, an increase in optical fiber micro-bending loss, or damage to the optical fiber itself.

[0007] 2. Long-term relaxation and wear risk of optical fiber: Under the action of long-term temperature cycling and mechanical vibration, the optical fiber laid along the pipeline is prone to relaxation and sagging. The relaxation of the optical fiber will change its thermal contact state with the surface of the pipeline, affecting the accuracy of temperature measurement. More seriously, in the high-temperature environment of the boiler, the sagging optical fiber may be damaged by local overheating due to its proximity to or contact with higher temperature components (such as adjacent pipelines or support structures), or it may be worn out due to relative friction with the pipeline or fixed parts, shortening its service life and affecting the long-term reliability of the monitoring system.

[0008] Therefore, there is a lack of a distributed temperature measuring device capable of effectively adapting to the thermal deformation of the boiler pipeline, ensuring the long-term stable and reliable contact of the optical fiber, and preventing the optical fiber from relaxing and wearing, which is the main obstacle to the popularization and application of the technology in the field of boiler pipeline temperature monitoring. SUMMARY

[0009] The present application aims to solve the problems of unstable contact pressure of the sensing optical fiber caused by the thermal deformation of the boiler pipeline, and the influence of the temperature measurement and reliability caused by the easy relaxation of the optical fiber in long-term operation, and provides a boiler pipeline surface temperature distributed measuring device.

[0010] The boiler pipeline surface temperature distributed measuring device provided by the present application comprises a signal demodulator, a sensing optical fiber and a terminal junction box, both ends of the sensing optical fiber are electrically connected with the signal demodulator and the terminal junction box respectively, and the sensing optical fiber is laid along the surface of the boiler pipeline, and further comprises:

[0011] A plurality of groups of optical fiber fixing assemblies are arranged at intervals on the surface of the boiler pipeline, each group of the optical fiber fixing assemblies comprises a positioning ring and a chassis used in cooperation, and the sensing optical fiber is arranged between the positioning ring and the surface of the boiler pipeline;

[0012] A heat conduction cavity is formed in the inside of the chassis, vertical holes are formed in both end faces close to the positioning ring and are in communication with the inside of the heat conduction cavity, and a bimetallic plate is arranged on the top surface of the inside of the heat conduction cavity at the position of the vertical holes;

[0013] The positioning ring movably penetrates the vertical holes, and the sensing optical fiber is pressed against the surface of the pipeline in the inside of the positioning ring; one end of the bimetallic plate is fixed in the heat conduction cavity, the other end is connected with the positioning ring, and the bimetallic plate drives the positioning ring to move in the vertical hole when it is deformed by heat, so as to dynamically adjust the pressing force on the sensing optical fiber;

[0014] Further comprising at least one group of optical fiber tensioning assemblies arranged at the end of the boiler pipeline, for applying and maintaining a preset tension on the sensing optical fiber.

[0015] Preferably, the optical fiber tensioning assembly comprises an upper abutting block, a lower abutting block and a driving cylinder;

[0016] The upper end face of the upper abutting block is fixedly connected with the piston rod of the driving cylinder;

[0017] The opposite faces of the upper abutting block and the lower abutting block constitute a clamping channel for clamping the sensing optical fiber;

[0018] At least one tension sensing module is arranged in the upper abutting block, the tension sensing module comprises a semicircular block slidably arranged in the upper abutting block and a tension sensor embedded in the semicircular block, and part of the surface of the semicircular block protrudes from the clamping channel for contacting a sensing optical fiber.

[0019] Preferably, a tensioning opening is formed in the lower abutting block and communicates with the clamping channel.

[0020] Two square openings are formed in the upper abutting block and communicate with the clamping channel, and the tension sensing module is arranged in each square opening.

[0021] The semicircular block of one of the tension sensing modules is directly connected to the piston rod of the driving cylinder through a linkage plate, and the semicircular block of the other tension sensing module is connected to the linkage plate through a vertical plate.

[0022] Preferably, a mounting plate is connected to the surface wall of the upper abutting block through bolts, which provides a basis for fixing and mounting the upper abutting block.

[0023] Preferably, the linkage plate is fixedly connected to the piston rod of the driving cylinder.

[0024] A lifting opening is formed in the side wall of the vertical plate, and a sliding block of the linkage plate extends into the lifting opening.

[0025] At least one limiting rod is fixed in the lifting opening, and a limiting hole is formed in the sliding block for the limiting rod to pass through.

[0026] A first elastic element is sleeved on the limiting rod, and the two ends of the first elastic element abut against the wall surface of the lifting opening and the sliding block, respectively.

[0027] Preferably, a positioning plate is fixed in the vertical hole, a compression plate is fixed on the positioning plate, and the end of the positioning ring is connected to the compression plate.

[0028] A second elastic element is arranged between the compression plate and the positioning plate.

[0029] The free end of the bimetallic plate is connected to the compression plate through a rope.

[0030] Preferably, a positioning hole is formed in the positioning plate, and the rope is connected to the bimetallic plate after sequentially passing through the second elastic element and the positioning hole.

[0031] Preferably, a detachable sealing plate is arranged at the bottom of the heat conduction cavity.

[0032] Preferably, a flexible cushion layer is arranged on the inner side of the positioning ring.

[0033] The positioning ring is slidably connected with itself through a sliding structure, the flexible cushion layer is fixed with two groups of L-shaped plates arranged symmetrically at the side wall of the positioning ring, the inner side of the positioning ring is provided with an L-shaped opening corresponding to the position of the L-shaped plate, and the L-shaped plate is slidably inserted into the corresponding L-shaped opening.

[0034] The boiler pipeline surface temperature distribution measuring device has the following advantages:

[0035] 1. Dynamic self-adaptive pressure regulation ensures the accuracy of temperature measurement under all working conditions:

[0036] Through the intelligent adjusting mechanism composed of a bimetallic plate, an elastic element and a transmission component, the positioning ring fixing the optical fiber can automatically displace in response to the temperature change of the pipeline. When the boiler starts and the pipeline warms up, the mechanism can automatically increase the pressing force on the optical fiber to ensure that it is in close contact with the pipeline surface and has good thermal coupling. When the boiler is shut down and the pipeline cools down, the mechanism can automatically release the pressure to avoid damaging or damaging the optical fiber due to the cold contraction of the pipeline. This automatic compensation mechanism effectively overcomes the direct impact of pipeline thermal expansion and cold contraction on the contact state, and fundamentally ensures the accuracy of temperature measurement and signal stability under different operating conditions.

[0037] 2. Active optical fiber tension maintenance improves long-term reliability of the system:

[0038] By setting a tensioning component integrated with tension sensing and pneumatic execution functions at a key position of the pipeline, real-time monitoring and active control of the optical fiber tension are realized. The system can automatically sense the relaxation of the optical fiber caused by creep or vibration and immediately drive the execution mechanism to make accurate compensation, so that the optical fiber is always maintained in a preset and moderate tension state. This not only effectively prevents temperature measurement errors, signal attenuation or local overheating risks caused by the relaxation and sagging of the optical fiber, but also avoids the risk of optical fiber micro-bending loss or mechanical damage caused by excessive tension, significantly improving the long-term durability and reliability of the entire monitoring system in harsh industrial environments.

[0039] 3. Structure integration optimization to realize the unity of function and protection:

[0040] The present application highly integrates various functional units such as temperature sensing, transmission, clamping and sensing in a compact mechanical system. This design not only realizes automatic adjustment in function, but also provides comprehensive protection for the optical fiber in structure. For example, the use of flexible cushion layer avoids mechanical scratching of the surface of the optical fiber, and moderate pressing force and tension force ensure measurement effect while minimizing the risk of fatigue damage to the optical fiber, realizing the unity of accurate measurement and long-term protection of the optical fiber. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is an external structure schematic diagram of the present application.

[0042] Figure 2 Structure sectional view of the positioning ring and the chassis in the present application.

[0043] Figure 3 Structure view of the positioning ring in the present application.

[0044] Figure 4 Structure sectional view of the chassis in the present application.

[0045] Figure 5 External structure perspective view of the tensioning assembly in the present application.

[0046] Figure 6 Structure sectional view of the tensioning assembly in the present application.

[0047] Figure 7 Structure combination view of the upper block, the mounting plate, the linkage plate and the vertical plate in the present application.

[0048] Figure 8 Structure view of the linkage plate and the vertical plate in the present application.

[0049] Figure 9 Structure view of the upper block in the present application. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0051] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0052] The present application will be further described below with reference to the drawings and specific embodiments, but is not limited by the present application.

[0053] Embodiment 1:

[0054] The present application will be further described below with reference to the drawings and specific embodiments, but is not limited by the present application. Figures 1-9 The present application will be further described below with reference to the drawings and specific embodiments, but is not limited by the present application.

[0055] A plurality of groups of optical fiber fixing assemblies are arranged at intervals on the surface of the boiler pipe, each group of the optical fiber fixing assemblies comprising a positioning ring 4 and a base frame 6 used in cooperation, and the sensing optical fiber 3 is arranged between the positioning ring 4 and the surface of the boiler pipe;

[0056] The base frame 6 is internally provided with a heat-conducting cavity 602, and the two end faces close to the positioning ring 4 are each provided with a vertical hole 603 in communication with the inside of the heat-conducting cavity 602, and the top surface inside the heat-conducting cavity 602 is provided with a bimetallic plate 405 at the position of the vertical hole 603;

[0057] The positioning ring 4 movably penetrates the vertical hole 603, and the inner side of the positioning ring 4 compresses the sensing optical fiber 3 against the pipe surface; one end of the bimetallic plate 405 is fixed in the heat-conducting cavity 602, and the other end is connected with the positioning ring 4, and when the bimetallic plate 405 is deformed by heat, the positioning ring 4 is driven to move in the vertical hole 603 to dynamically adjust the compression force on the sensing optical fiber 3;

[0058] Further, the optical fiber tensioning assembly 2 comprises an upper abutting block 201, a lower abutting block 202 and a driving air cylinder 206;

[0059] Further, the optical fiber tensioning assembly 2 comprises an upper abutting block 201, a lower abutting block 202 and a driving air cylinder 206;

[0060] The upper end face of the upper abutting block 201 is fixedly connected with the piston rod of the driving air cylinder 206;

[0061] The opposite faces of the upper abutting block 201 and the lower abutting block 202 constitute a clamping channel for clamping the sensing optical fiber 3;

[0062] The upper abutting block 201 is provided with at least one tension sensing module, the tension sensing module comprising a semicircular block 207 slidably arranged in the upper abutting block 201 and a tension sensor embedded in the semicircular block 207, and part of the surface of the semicircular block 207 protrudes from the clamping channel and is used to contact the sensing optical fiber 3.

[0063] Further, the lower abutting block 202 is provided with a tensioning opening 202a in communication with the clamping channel;

[0064] The upper abutting block 201 is provided with two square openings 201a in communication with the clamping channel, and the two square openings 201a are each provided with the tension sensing module;

[0065] The semicircular block 207 of one of the tension sensing modules is directly connected with the piston rod of the driving air cylinder 206 through a linkage plate 204, and the semicircular block 207 of the other tension sensing module is connected with the linkage plate 204 through a vertical plate 205.

[0066] Further, the surface wall of the upper abutting block 201 is connected with a mounting plate 203 through a bolt, which is used for providing a fixed and mounted base for the upper abutting block 201.

[0067] Further, the linkage plate 204 is fixedly connected with the piston rod of the driving cylinder 206.

[0068] The side wall of the vertical plate 205 is provided with a lifting opening 205a, and the linkage plate 204 is fixed with a sliding block 204b extending into the lifting opening 205a.

[0069] At least one limiting rod 205b is fixed in the lifting opening 205a, and the sliding block 204b is provided with a limiting hole 204c through which the limiting rod 205b passes.

[0070] A first elastic element 204d is sleeved on the limiting rod 205b, and the two ends of the first elastic element 204d are respectively abutted with the wall surface of the lifting opening 205a and the sliding block 204b.

[0071] Further, a positioning plate 604 is fixed in the vertical hole 603, a compression plate 404 is fixed on the positioning plate 604, the compression plate 404 is connected with the end of the positioning ring 4, a second elastic element 406 is arranged between the compression plate 404 and the positioning plate 604, and the free end of the bimetallic plate 405 is connected with the compression plate 404 through a rope 407.

[0072] Further, a positioning hole 605 is formed in the positioning plate 604, and the rope 407 is connected with the bimetallic plate 405 after sequentially passing through the second elastic element 406 and the positioning hole 605.

[0073] Further, a detachable sealing plate 601 is arranged at the bottom of the heat conduction cavity 602.

[0074] Further, a flexible cushion layer 401 is arranged on the inner side of the positioning ring 4.

[0075] The positioning ring 4 is slidably connected with itself through a sliding structure, two groups of L-shaped plates 402 symmetrically arranged are fixed on the side wall of the positioning ring 4 through the flexible cushion layer 401, L-shaped openings 403 are formed in the inner side of the positioning ring 4 corresponding to the positions of the L-shaped plates 402, and the L-shaped plates 402 are slidably inserted into the corresponding L-shaped openings 403.

[0076] The present application comprises a signal demodulator 1, a sensing optical fiber 3 and a terminal junction box 5, the two ends of the sensing optical fiber 3 are electrically connected with the signal demodulator 1 and the terminal junction box 5 respectively, the sensing optical fiber 3 is arranged along the surface of the boiler pipeline, a plurality of positioning rings 4 and chassis 6 are arranged along the path of the boiler pipeline and are used in cooperation, and an optical fiber tensioning assembly 2 for tensioning the sensing optical fiber 3 is arranged at the position of both ends of the boiler pipeline.

[0077] The sensing optical fiber 3 is arranged between the positioning ring 4 and the pipeline, the inside of the chassis 6 is provided with a heat conduction cavity 602, the two end faces of the chassis 6 close to the positioning ring 4 are provided with vertical holes 603 which are in communication with the inside of the heat conduction cavity 602, and the top surface of the inside of the heat conduction cavity 602 is provided with bimetal plates 405 at the position of the vertical holes 603, so as to facilitate the movement of the positioning ring 4 through the temperature sensing bending function of the bimetal plates 405.

[0078] The optical fiber tensioning assembly 2 comprises an upper block 201 and a lower block 202 which are arranged in sequence, the sensing optical fiber 3 passes through the position between the upper block 201 and the lower block 202, the upper end face of the upper block 201 is fixed with a gas cylinder 206, the upper end face of the lower block 202 is provided with a tensioning hole 202a which penetrates the part close to the boiler pipeline, the lower end face of the upper block 201 is provided with two groups of square holes 201a which are arranged in symmetry, the inside of the two square holes 201a is provided with a semicircular block 207 in which a tension sensor is embedded, when the sensing optical fiber 3 passes through the position between the upper block 201 and the lower block 202, the sensing optical fiber 3 will be in contact with the surface of the semicircular block 207, and the tension sensor will be pushed by the semicircular block 207, so as to determine the tension between the sensing optical fiber 3 and the semicircular block 207, and thus to determine whether the sensing optical fiber 3 is in a relaxed state.

[0079] It should be noted that the electrical structures used are all powered by external power supply and are uniformly linked and controlled by the control center.

[0080] Specifically, the lower end of the chassis 6 is bolted with a sealing plate 601, the part of the bimetallic plate 405 away from the vertical hole 603 is bolted in the heat conduction cavity 602, the bottom inside the vertical hole 603 is fixed with a positioning plate 604, both ends of the positioning plate 604 are fixed with a compression plate 404 corresponding to the position of the vertical hole 603, the lower end surface of the compression plate 404 is fixed with a spring 406 connected with the upper end surface of the positioning plate 604, the lower end surface of the compression plate 404 is fixed with a rope 407, the upper end surface of the positioning plate 604 is provided with a positioning hole 605, the lower end of the rope 407 passes through the inside of the spring 406 and the positioning hole 605 and is connected with the bimetallic plate 405, through the use of the positioning hole 605, the rope 407 can move up and down in the positioning hole 605, so that the bimetallic plate 405 can pull the rope 407, and the rope 407 can pull the compression plate 404 into the vertical hole 603, and the compression plate 404 can compress the spring 406.

[0081] Specifically, according to Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , the upper and lower positions of the tensioning port 202a and one of the square ports 201a are consistent, the upper end surface of the upper block 201 is provided with two groups of adjustment ports 201b respectively connected with the interiors of the two square ports 201a, the upper end surface of the semicircular block 207 above the tensioning port 202a is fixed with a linkage plate 204 passing through the interiors of the adjustment ports 201b, the upper end surface of the other semicircular block 207 is fixed with a vertical plate 205 passing through the interiors of the adjustment ports 201b, the upper end surface of the linkage plate 204 is fixed with a horizontal plate 204a connected with the side wall of the vertical plate 205, and the horizontal plate 204a is bolted with the piston end of the air cylinder 206, the side wall of the vertical plate 205 is provided with a lifting port 205a, the end surface of the horizontal plate 204a close to the vertical plate 205 is fixed with a sliding block 204b inside the lifting port 205a, the side wall of the vertical plate 205 is provided with a lifting port 205a, and when the vertical plate 205 is stopped by the lower block 202 and cannot continue to move, because the sliding block 204b is in the lifting port 205a, the horizontal plate 204a will continue to move downward along the vertical plate 205, so that the movable distance of the linkage plate 204 and the vertical plate 205 is not the same, so that the linkage plate 204 can conveniently tension the sensing optical fiber 3;

[0082] The horizontal plate 204a is fixed with a sliding block 204b at the inner position of the lifting hole 205a, the lower end surface of the sliding block 204b is provided with two sets of symmetrical limiting holes 204c, the upper and lower surfaces in the lifting hole 205a are both bolted with two limiting rods 205b respectively penetrating the limiting holes 204c, the limiting rods 205b and the limiting holes 204c are matched to limit the spring 204d of the sliding block 204b, so as to avoid excessive bending of the spring 204d, the surface wall of each limiting rod 205b located directly below the sliding block 204b is sleeved with a spring 204d, the spring 204d and the sliding block 204b are matched and used, so that the vertical plate 205 is not moved, and when the linkage plate 204 continues to move downward, the sliding block 204b moves in the lifting hole 205a, and the two ends of each spring 204d are abutted with the bottom of the lifting hole 205a and the lower end surface of the sliding block 204b, the surface wall of the upper abutting block 201 is bolted with the mounting plate 203, and the mounting plate 203 can be used to install the upper abutting block 201 on the wall or external equipment, so as to position the position of the entire optical fiber tensioning assembly 2.

[0083] Further, the middle position of the inner side of the positioning ring 4 is provided with a foam pad 401, the foam pad 401 is fixed with two sets of symmetrical L-shaped plates 402 at the side wall of the positioning ring 4, the inner side of the positioning ring 4 is provided with L-shaped openings 403 corresponding to the positions of the L-shaped plates 402, the L-shaped plates 402 are slidingly inserted into the corresponding L-shaped openings 403, and the L-shaped plates 402 can be quickly disassembled in the L-shaped openings 403, so that the foam pad 401 can be conveniently disassembled in the positioning ring 4, and at the same time, the foam pad 401 is in the positioning ring 4, so that when the positioning ring 4 extrudes the sensing optical fiber 3, the sensing optical fiber 3 will be extruded by the foam pad 401 at the first time, and since the foam pad 401 will be compressed and deformed, the sensing optical fiber 3 can be prevented from being excessively damaged when the sensing optical fiber 3 is always connected with the pipeline.

[0084] The operation process of the embodiment is as follows: first, the sensing optical fiber 3 is distributed and arranged along the path of the boiler pipeline, the positioning ring 4 and the chassis 6 position the sensing optical fiber 3, control the distance between the sensing optical fiber 3 and the boiler pipeline, and connect the head and tail ends of the sensing optical fiber 3 with the signal demodulator 1 and the terminal continuation box 5, so that the signal demodulator 1 is controlled, a high-power and narrow-pulse-width laser pulse generated by a laser is transmitted along the sensing optical fiber 3 as a detection light source, the injected laser and the returned scattered light are separated to ensure the directionality of signal transmission, and extremely weak Raman scattered light signals are received and converted into electrical signals, and finally the electrical signals are transmitted to the control center for arrangement, so as to determine the temperature of each point of the boiler pipeline.

[0085] Meanwhile, when the boiler is running, the temperature of the boiler pipe will gradually increase, and thus the high temperature of the surface of the boiler pipe enters the heat conduction cavity 602, and the bimetallic plate 405 in the heat conduction cavity 602 will be bent downward, and thus the bimetallic plate 405 will pull the positioning ring 4 downward through the rope 407, so that the positioning ring 4 squeezes the sensing optical fiber 3 in the inner side position of the positioning ring 4, and ensures that the sensing optical fiber 3 is always in contact with the surface wall of the boiler pipe. When the boiler stops running, the temperature of the surface of the boiler pipe gradually decreases, and the bimetallic plate 405 gradually resets, and at this time, the spring 406 pushes the compression plate 404 to move upward, and thus the positioning ring 4 resets to the initial position, so that the sensing optical fiber 3 is separated from the surface of the boiler pipe, so as to dissipate heat of the sensing optical fiber 3.

[0086] In addition, when the sensing optical fiber 3 is relaxed, the tension sensor on the surface side of the semicircular block 207 and the sensing optical fiber 3 should change, and thus the control cylinder 206 needs to drive the horizontal plate 204a to move downward, and at this time, the horizontal plate 204a will simultaneously drive the linkage plate 204 and the vertical plate 205 to move downward synchronously, and the vertical plate 205 will clamp the sensing optical fiber 3 close to the signal demodulator 1 and the terminal continuation box 5 through the semicircular block 207, and at the same time, the linkage plate 204 will slightly push the sensing optical fiber 3 into the tensioning port 202a through the semicircular block 207, so as to straighten the relaxed sensing optical fiber 3.

[0087] Although the present application is described herein with reference to particular embodiments, it is to be understood that these embodiments are merely exemplary of the principles and applications of the present application. It is therefore to be understood that numerous modifications can be made to the illustrative embodiments and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It is to be understood that the features of the dependent claims can be combined with those of the parent application in any way deemed suitable by those skilled in the art, other than those specifically described herein. It is to be understood that features described in relation to one embodiment can be used in other embodiments described herein.

Claims

1. A distributed surface temperature measurement device for boiler pipes, comprising a signal demodulator (1), a sensing optical fiber (3), and a terminal junction box (5), wherein the two ends of the sensing optical fiber (3) are electrically connected to the signal demodulator (1) and the terminal junction box (5) respectively, and are laid along the surface of the boiler pipes, characterized in that, Also includes: Multiple sets of optical fiber fixing components are spaced apart on the surface of the boiler pipe. Each set of optical fiber fixing components includes a positioning ring (4) and a base frame (6) used in cooperation with each other. The sensing optical fiber (3) is disposed between the positioning ring (4) and the surface of the boiler pipe. The base frame (6) has a heat-conducting cavity (602) inside. Vertical holes (603) that communicate with the inside of the heat-conducting cavity (602) are opened on both ends near the positioning ring (4). A bimetallic plate (405) is provided on the top surface inside the heat-conducting cavity (602) at the position of the vertical hole (603). The positioning ring (4) can be movably passed through the vertical hole (603), and its inner side presses the sensing fiber (3) against the pipe surface; one end of the bimetallic plate (405) is fixed in the heat-conducting cavity (602), and the other end is connected to the positioning ring (4). When the bimetallic plate (405) is heated and deformed, it drives the positioning ring (4) to move in the vertical hole (603) to dynamically adjust the pressing force on the sensing fiber (3); It also includes at least one set of fiber tensioning components (2), which are disposed at the end of the boiler pipe to apply and maintain a preset tension on the sensing fiber (3).

2. The distributed measurement device for boiler pipe surface temperature according to claim 1, characterized in that, The fiber tensioning assembly (2) includes an upper abutment block (201), a lower abutment block (202), and a drive cylinder (206). The upper end face of the upper abutment block (201) is fixedly connected to the piston rod of the drive cylinder (206); The opposing surfaces of the upper abutment block (201) and the lower abutment block (202) form a clamping channel for clamping the sensing optical fiber (3); At least one tension sensing module is provided in the upper abutment block (201). The tension sensing module includes a semi-circular block (207) slidably disposed in the upper abutment block (201) and a tension sensor embedded in the semi-circular block (207). A portion of the surface of the semi-circular block (207) protrudes from the clamping channel for contact with the sensing optical fiber (3).

3. The distributed measurement device for boiler pipe surface temperature according to claim 2, characterized in that, The lower abutment block (202) has a tensioning opening (202a) that communicates with the clamping channel. The upper abutment block (201) has two square openings (201a) that communicate with the clamping channel, and the tension sensing module is provided in both square openings (201a). One of the tension sensing modules has a semicircular block (207) that is directly connected to the piston rod of the drive cylinder (206) via a linkage plate (204), and the other tension sensing module has a semicircular block (207) that is connected to the linkage plate (204) via a vertical plate (205).

4. The distributed measurement device for boiler pipe surface temperature according to claim 1, characterized in that, The upper abutment block (201) has a mounting plate (203) bolted to its surface, which provides a base for fixing and installing the upper abutment block (201).

5. The distributed measurement device for boiler pipe surface temperature according to claim 1, characterized in that, The linkage plate (204) is fixedly connected to the piston rod of the drive cylinder (206); The vertical plate (205) has a lifting port (205a) through its side wall, and the linkage plate (204) has a slider (204b) that extends into the lifting port (205a). At least one limiting rod (205b) is fixed inside the lifting port (205a), and a limiting hole (204c) is provided on the slider (204b) for the limiting rod (205b) to pass through. The limiting rod (205b) is fitted with a first elastic element (204d), and the two ends of the first elastic element (204d) abut against the wall of the lifting port (205a) and the slider (204b), respectively.

6. A distributed measurement device for boiler pipe surface temperature according to claim 1, characterized in that, A positioning plate (604) is fixed inside the vertical hole (603), and a compression plate (404) is fixed on the positioning plate (604). The compression plate (404) is connected to the end of the positioning ring (4). A second elastic element (406) is provided between the compression plate (404) and the positioning plate (604). The free end of the bimetallic plate (405) is connected to the compression plate (404) by a rope (407).

7. The distributed measurement device for boiler pipe surface temperature according to claim 1, characterized in that, The positioning plate (604) has a positioning hole (605), and the rope (407) passes through the second elastic element (406) and the positioning hole (605) in sequence and is then connected to the bimetallic plate (405).

8. A distributed measurement device for boiler pipe surface temperature according to claim 1, characterized in that, The bottom of the heat-conducting cavity (602) is provided with a removable sealing plate (601).

9. A distributed measurement device for boiler pipe surface temperature according to claim 1, characterized in that, A flexible pad (401) is provided on the inner side of the positioning ring (4). The positioning ring (4) is slidably connected to itself through a sliding structure. The flexible pad (401) is fixed to the side wall of the positioning ring (4) with two sets of symmetrically arranged L-shaped plates (402). The inner side of the positioning ring (4) is provided with L-shaped openings (403) corresponding to the positions of the L-shaped plates (402). The L-shaped plates (402) are slidably inserted into the corresponding L-shaped openings (403).

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