CN113588120A - Temperature measuring device and temperature measuring method - Google Patents
Temperature measuring device and temperature measuring method Download PDFInfo
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- CN113588120A CN113588120A CN202110852976.1A CN202110852976A CN113588120A CN 113588120 A CN113588120 A CN 113588120A CN 202110852976 A CN202110852976 A CN 202110852976A CN 113588120 A CN113588120 A CN 113588120A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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Abstract
The application discloses a temperature measuring device and a temperature measuring method, and relates to the technical field of power and electrical science. A temperature measuring device comprises an optical fiber measuring assembly, wherein the optical fiber measuring assembly comprises an optical fiber body and optical fiber gratings, the optical fiber body is provided with a plurality of optical fiber gratings, a main body to be measured comprises a pipeline, and the pipeline is provided with at least one optical fiber grating; the laser modulator is connected with the optical fiber body; the laser emitted by the laser modulator is transmitted to the fiber bragg grating along the fiber body, is reflected by the fiber bragg grating and then returns, and is received and demodulated by the laser modulator. A temperature measurement method includes: emitting laser through a laser modulator and transmitting the laser to the fiber bragg grating; reflecting the laser through the fiber bragg grating; the returned laser light is received and demodulated by a laser modulator. The thermoelectric module can solve the problems that the thermocouple or the thermal resistor temperature measurement mode causes high cost, complex system, large occupied space and the like.
Description
Technical Field
The application belongs to the technical field of power and electrical science, and particularly relates to a temperature measuring device and a temperature measuring method.
Background
In various types of industrial boilers, the temperature conditions of the various devices of the industrial boiler are typically measured using thermocouples or thermal resistors. However, as power station boilers develop toward large-capacity and high-parameter units, the number of the heat receiving surface tubes is extremely large, and the wall temperature difference of the furnace tubes is large due to factors such as uneven heat absorption, uneven flow and uneven structure on the inlet and outlet sections of each heat receiving surface tube.
In order to monitor the temperature of the furnace tube more accurately, more temperature measuring points need to be arranged on the side wall of the furnace tube, and each temperature measuring point is respectively provided with a thermocouple or a thermal resistor, so that a large number of thermocouples or thermal resistors are needed, and a compensation lead wire required by each thermocouple or thermal resistor is as long as 20-30 meters, so that the temperature measuring system is more complex, the cost is higher, the occupied space is larger, and the realization in the actual production cannot be realized.
Disclosure of Invention
The embodiment of the application aims to provide a temperature measuring device and a temperature measuring method, and the problems that a temperature measuring system is complex, high in cost, large in occupied space and the like due to a thermocouple or thermal resistor temperature measuring mode can be solved.
In order to solve the technical problem, the present application is implemented as follows:
the embodiment of the application provides a temperature measurement device for to measure and measure the temperature of measuring the main part, this temperature measurement device includes:
the optical fiber measuring assembly comprises an optical fiber body and a plurality of optical fiber gratings, the optical fiber body is provided with the optical fiber gratings, the main body to be measured comprises a pipeline, and at least one optical fiber grating is arranged on the side wall of the pipeline;
the laser modulator is connected with the optical fiber body and used for emitting laser or receiving laser;
the laser emitted by the laser modulator is transmitted to the fiber bragg grating along the fiber body, reflected by the fiber bragg grating and returned along the fiber body, and the returned laser is received by the laser modulator.
The embodiment of the application also provides a temperature measurement method, which is applied to the temperature measurement device, and the temperature measurement method comprises the following steps:
emitting laser to the optical fiber body through the laser modulator, and transmitting the laser to the fiber bragg grating along the optical fiber body;
reflecting the laser through the fiber bragg grating and enabling the laser to return along the fiber body;
and receiving and demodulating the returned laser through the laser modulator to obtain the temperature value of the temperature measuring point.
In this application embodiment, through arranging fiber grating on the lateral wall of pipeline, can adopt fiber grating to measure the temperature of pipeline lateral wall, compare in adopting thermocouple or thermal resistance temperature measurement mode, this application can carry out the temperature measurement to the lateral wall of pipeline through a plurality of fiber grating, thereby need not to use a large amount of thermocouples or thermal resistance, and need not to use the compensation wire, can save a large amount of metal material and compensation wire, make cost greatly reduced, meanwhile, owing to reduced the structural component, make whole temperature measurement system no longer complicated, and corresponding occupation space has been reduced.
Drawings
FIG. 1 is a schematic diagram of a temperature measurement device disclosed in an embodiment of the present application;
fig. 2 is a schematic diagram of a first arrangement of a fiber grating on a body to be measured according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a second arrangement of fiber gratings on a body to be measured according to an embodiment of the present application;
fig. 4 is a schematic diagram of a third arrangement of a fiber grating on a body to be measured according to an embodiment of the present application;
fig. 5 is a schematic diagram of a fiber grating arranged on a body to be measured in a fourth manner according to an embodiment of the present application;
fig. 6 is a schematic diagram of a temperature measurement method disclosed in an embodiment of the present application.
Description of reference numerals:
100-a fiber optic measurement assembly; 110-a fiber body; 120-fiber grating; 130-a packaging jacket;
200-a laser modulator;
300-a body to be measured; 310-a pipeline;
400-heat collecting block.
Detailed Description
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, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1 to 5, an embodiment of the present application discloses a temperature measuring apparatus for measuring a temperature of a main body 300 to be measured. The main body 300 to be measured can be a utility boiler, and the temperature of a furnace tube of the utility boiler can be measured by the temperature measuring device, so that the temperature of each device of the utility boiler can be monitored, and the safe operation of the utility boiler can be ensured. Besides, the temperature measuring device can be applied to other scenes, and the application scene of the temperature measuring device is not limited in the embodiment of the application.
Referring to fig. 1, the disclosed temperature measurement device includes a fiber optic measurement assembly 100 and a laser modulator 200. The optical fiber measurement assembly 100 includes an optical fiber body 110 and a fiber grating 120, and the optical fiber body 110 is provided with a plurality of fiber gratings 120. Alternatively, the fiber body 110 may be an elongated fiber structure, such as a fiber optic cable, a fiber bundle, or the like. The plurality of fiber gratings 120 are disposed on the optical fiber body 110 at intervals along a length direction of the optical fiber body 110. Meanwhile, the plurality of fiber gratings 120 are also connected to the fiber body 110, so that signal transmission between the fiber gratings 120 and the fiber body 110 can be realized. Alternatively, in the embodiment of the present application, an FBG fiber grating may be used.
In some embodiments, the plurality of fiber gratings 120 may be directly written on the fiber body 110; in addition, each fiber grating 120 may be connected to the fiber body 110 through a wire harness, and at this time, the fiber grating 120 may have a certain distance with respect to the fiber body 110, so that the adaptability and convenience of installing the fiber grating 120 may be improved.
In the present embodiment, the optical fiber measurement assembly 100 is used to measure the temperature on the main body 300 to be measured. Wherein the body 300 to be measured includes a pipe 310, and at least one fiber grating 120 is disposed on a sidewall of the pipe 310.
Alternatively, when the temperature measuring device is applied to a boiler, the pipeline 310 is a furnace tube, and the furnace tube is not limited to a heat exchange tube in a utility boiler or an industrial boiler, but may also be a heat exchange tube in various heat exchangers, such as a heat exchange tube in heat exchange products such as a refrigerator and an air conditioner. Meanwhile, the pipeline 310 may be a small-bore furnace tube, but is not limited to a small-bore tube, and may also be various heat exchangers and working medium delivery pipes with larger diameters.
Optionally, the main body 300 to be measured may include a plurality of pipes 310, and a fiber grating 120 is disposed on a sidewall of each pipe 310, in this case, the plurality of fiber gratings 120 may be correspondingly disposed on the plurality of pipes 310, and the plurality of fiber gratings 120 are connected to the optical fiber body 110, so that the temperature on the plurality of pipes 310 may be measured by the plurality of fiber gratings 120, respectively.
Optionally, the main body 300 to be measured may include a plurality of pipes 310, and a plurality of fiber gratings 120 are disposed on a sidewall of each pipe 310, in this case, the plurality of fiber gratings 120 on each pipe 310 may be disposed along a length direction of the pipe 310, or may be disposed along an outer circumference of the pipe 310, and of course, other arrangement manners may be selected according to actual requirements. In this manner, the temperature at different locations on the sidewall can be simultaneously detected by the multiple fiber gratings 120 on each of the conduits 310.
In the embodiment of the present application, the laser modulator 200 is a device for emitting laser light and receiving laser light in the temperature measuring apparatus. The laser modulator 200 is connected to the optical fiber body 110, so that laser light can be emitted to the optical fiber body 110 and laser light returned from the optical fiber body 110 can be received.
In the working process of the temperature measuring device, laser with a certain wavelength is emitted to the optical fiber body 110 by the laser modulator 200, when the laser is transmitted to the fiber grating 120, a part of the laser is reflected by the fiber grating 120 and then returns along the optical fiber body 110, and the returned laser is received and demodulated by the laser modulator 200.
Based on the above arrangement, when the temperature of the position of the fiber grating 120 on the pipeline 310 changes, the period of the grating stripe of the fiber grating 120 changes due to the expansion with heat and contraction with cold, so that the wavelength of the laser reflected by the fiber grating 120 changes, and the temperature value is displayed after the laser modulator 200 receives and demodulates the laser. Compared with a thermocouple or thermal resistor temperature measurement mode, the fiber bragg grating 120 temperature measurement method has the advantages of being large in dynamic range, high in sensitivity, fast in response, anti-electromagnetic interference and the like, and is suitable for multipoint temperature measurement. Meanwhile, a large amount of thermocouples or thermal resistors and compensation wires are not needed, a large amount of metal materials and compensation wires can be saved, the cost is greatly reduced, meanwhile, the whole temperature measurement system is not complex any more due to the fact that structural members are reduced, and corresponding occupied space is reduced. In addition, the plurality of fiber gratings 120 are arranged on the optical fiber body 110, so that the multi-point temperature measurement of the main body 300 to be measured is realized, the temperature measurement system is greatly simplified, the measurement efficiency is improved, the industrial requirement is met, and the large-scale industrial application can be realized.
The temperature measuring device in the embodiment of the application can be applied to a power station boiler, at the moment, the fiber grating 120 is laid on the side wall of a furnace tube of the power station boiler, and good contact is ensured, so that the temperature of the side wall of the furnace tube can be accurately reflected, laser with a certain wavelength is emitted through the laser modulator 200, when the temperature of a contact area of the fiber grating 120 and the furnace tube changes, the period of grating stripes of the fiber grating 120 changes, so that the wavelength of the laser reflected by the fiber grating 120 changes, the laser modulator 200 receives the reflected laser and demodulates the reflected laser, and accordingly the temperature value of a temperature measuring point on the furnace tube is displayed. It should be noted that, the specific operation principle of the laser modulator 200 can be referred to in the related art, and will not be described in detail here.
Further, the temperature measuring device may be disposed inside a furnace top large bag of the utility boiler, which may be regarded as a simplified heat insulation box, and the laser modulator 200 is disposed outside the utility boiler in a normal temperature environment. Of course, the temperature measuring device is not limited to be installed in the furnace top large bag, and may be installed in each intermediate header, the furnace, or the like.
Referring to fig. 2, in the first embodiment, the temperature measuring apparatus includes a set of optical fiber measuring assemblies 100, and a main body 300 to be measured includes a plurality of pipes 310 arranged in parallel, wherein the optical fiber bodies 110 in the set of optical fiber measuring assemblies 100 extend along the arrangement direction of the plurality of pipes 310, and a plurality of optical fiber gratings 120 on the optical fiber bodies 110 are connected to the plurality of pipes 310 in a one-to-one correspondence manner. Optionally, a plurality of fiber gratings 120 are written on one optical fiber body 110, and the optical fiber body 110 extends along the arrangement direction of the plurality of pipes 310, that is, the optical fiber body 110 is connected to the plurality of pipes 310, so that one fiber grating 120 is disposed on each pipe 310, and the fiber grating 120 on each pipe 310 is connected to the optical fiber body 110. In this way, the temperatures on the plurality of pipes 310 can be measured separately by the optical fiber measurement assembly 100 to know the temperature of the temperature measurement point on each pipe 310. In this case, it is not necessary to install a thermocouple or a thermal resistor on each pipe 310, and the measurement system can be simplified to some extent and the measurement efficiency can be improved.
Referring to fig. 3, in the second embodiment, the temperature measuring apparatus includes a plurality of sets of optical fiber measuring assemblies 100, a main body 300 to be measured includes a plurality of pipes 310 arranged in parallel, and the plurality of sets of optical fiber measuring assemblies 100 are arranged at intervals along an extending direction of the pipes 310. The optical fiber bodies 110 in each group of optical fiber measurement assemblies 100 extend along the arrangement direction of the plurality of pipes 310, and the plurality of optical fiber gratings 120 on the optical fiber bodies 110 are connected to the plurality of pipes 310 in a one-to-one correspondence manner. Optionally, a plurality of fiber gratings 120 are written on the fiber body 110 in each group of fiber measurement assemblies 100, and the fiber body 110 in each group of fiber measurement assemblies 100 extends along the arrangement direction of the plurality of pipes 310, that is, the fiber body 110 and the plurality of pipes 310 are arranged in a crossing manner.
Based on the above arrangement, a plurality of fiber gratings 120 are disposed on each of the tubes 310, and the fiber gratings 120 on each of the tubes 310 are respectively connected to the fiber bodies 110 in a plurality of different sets of fiber measurement assemblies 100. In this way, the laser reflected by the fiber bragg grating 120 on each of the pipes 310 can be transmitted through the fiber body 110 in the multiple sets of fiber measurement assemblies 100, so that the temperature value of each temperature measurement point on each of the pipes 310 can be obtained.
Meanwhile, the plurality of fiber gratings 120 on the fiber body 110 in each group of fiber measurement assemblies 100 can simultaneously measure the temperature values of the temperature measurement points on the plurality of pipes 310.
Therefore, the plurality of sets of optical fiber measurement assemblies 100 can form temperature measurement points distributed in a network manner on the main body 300 to be measured, so that the main body 300 to be measured can be comprehensively covered, the temperature of the main body 300 to be measured can be comprehensively monitored, further, the faults of blasting of the pipeline 310 and the like caused by insufficient monitoring can be avoided or eliminated, and the safety performance of the main body 300 to be measured is greatly improved.
It should be noted here that, in the second embodiment, the multiple groups of optical fiber measurement assemblies 100 may share one laser modulator 200, that is, each optical fiber body 110 in the multiple groups of optical fiber measurement assemblies 100 is connected to the same laser modulator 200, so that laser can be emitted to each optical fiber body 110 through the laser modulator 200, and the laser returned by each optical fiber body 110 is sent to the same laser modulator 200 for demodulation, and then the demodulated data is sent to the control unit connected to the laser modulator 200 for processing. Of course, it is also possible that one laser modulator 200 is applied to each optical fiber measurement component 100, and then the plurality of laser modulators 200 are connected to the control unit respectively, so as to send the data demodulated by each laser modulator 200 to the control unit, and finally the control unit processes the data.
Referring to fig. 4, in the third embodiment, the temperature measuring apparatus includes a set of optical fiber measuring assemblies 100, wherein the optical fiber bodies 110 of the set of optical fiber measuring assemblies 100 extend along the length direction of the pipe 310, that is, the extending direction of the optical fiber bodies 110 is the same as or opposite to the flowing direction of the working medium in the pipe 310, and a plurality of optical fiber gratings 120 on the optical fiber bodies 110 are connected to the side wall of the same pipe 310 at intervals. Based on the above arrangement, the temperature value of each measurement point on one pipe 310 can be measured by a plurality of fiber gratings 120 in one set of fiber measurement assemblies 100. The embodiment can be applied to some special occasions, for example, the temperature of some pipes 310 is relatively high and needs to be monitored separately, and at this time, a plurality of fiber gratings 120 can be arranged on the pipes 310 separately to detect the pipes 310 so as to ensure that the temperature of the pipes 310 is not too high, and on this basis, the temperature of other pipes 310 is not too high.
It should be noted here that the fiber grating 120 can be arranged on the pipe 310 in a targeted manner in the third embodiment, and the number of applications of the fiber grating 120 can be reduced to a certain extent, so as to reduce the investment cost.
Referring to fig. 5, in a fourth embodiment, the temperature measuring apparatus includes a plurality of sets of optical fiber measuring assemblies 100, the main body 300 to be measured includes a plurality of pipes 310 arranged in parallel, and each set of optical fiber measuring assemblies 100 corresponds to each pipe 310 one by one; the optical fiber body 110 of each set of optical fiber measurement assembly 100 extends along the length direction of the corresponding pipe 310, and the plurality of fiber gratings 120 on the optical fiber body 110 are connected to the sidewall of the pipe 310 at intervals. Optionally, a plurality of fiber gratings 120 are written on the optical fiber body 110 in each group of the optical fiber measurement assembly 100, so that a plurality of temperature measurement points on the corresponding pipeline 310 can be measured through the plurality of fiber gratings 120 in each group of the optical fiber measurement assembly 100.
Based on the above arrangement, each group of optical fiber measurement assemblies 100 measures the temperature of each of the pipes 310 individually, so as to obtain the temperature values at different positions on each of the pipes 310.
Therefore, the plurality of sets of optical fiber measurement components 100 can form temperature measurement points distributed in a network manner on the main body 300 to be measured, and determine the temperature field distribution on the main body 300 to be measured by a mathematical method, so that the main body 300 to be measured can be comprehensively covered, the main body 300 to be measured can be comprehensively monitored, further, the faults of blasting of the pipeline 310 and the like caused by insufficient monitoring can be avoided or eliminated, and the safety performance of the main body 300 to be measured is greatly improved.
It should be noted here that, in the fourth embodiment, multiple sets of optical fiber measurement assemblies 100 may share one laser modulator 200, and each set of optical fiber measurement assembly 100 may also independently apply one laser modulator 200, which is not limited in the embodiment of the present application.
Of course, other modes can be adopted besides the above embodiments as long as the temperature measurement of the main body 300 to be measured can be realized, and the arrangement mode of the fiber grating 120 on the main body 300 to be measured is not limited in the embodiment of the present application.
In some embodiments, the distance between two adjacent fiber gratings 120 is greater than or equal to 7mm, specifically including 7mm, 8mm, 10mm, 15mm, 20mm, and the like. Alternatively, the distance between two adjacent fiber gratings 120 on the fiber body 110 in the same group of fiber measurement assemblies 100 may be greater than or equal to 7mm, or the distance between the respective fiber gratings 120 in two adjacent groups of fiber measurement assemblies 100 may be greater than or equal to 7 mm. Based on the above arrangement, on the one hand, the normal distribution of the fiber bragg grating 120 on the main body 300 to be measured can be ensured, and on the other hand, the dense measurement of the main body 300 to be measured can be realized, so as to improve the measurement accuracy.
In order to realize the connection between the fiber grating 120 and the pipe 310, in the embodiment of the present application, a heat collecting block 400 may be disposed on an outer wall of the pipe 310, and the fiber grating 120 is fixed to the heat collecting block 400. By providing the heat collecting block 400, on one hand, the fiber grating 120 can be fixed on the sidewall of the pipe 310, and on the other hand, a certain heat collecting effect can be achieved, so that the fiber grating 120 can more accurately measure the temperature value of the sidewall of the pipe 310. Alternatively, the heat collecting block 400 may be a copper block, an iron block, or the like.
In other embodiments, the fiber grating 120 may be fixed to the sidewall of the pipe 310 by welding, bonding, banding, or clipping, so as to ensure that the fiber grating 120 is in good contact with the sidewall of the pipe 310.
To further improve the measurement accuracy, the contact area between the fiber grating 120 and the sidewall of the pipe 310 may be insulated to reduce the measurement error.
Referring to fig. 1, in some embodiments, the optical fiber measurement assembly 100 further includes an encapsulation sheath 130, and the encapsulation sheath 130 covers the outer side of the optical fiber body 110, so that the optical fiber body 110 and the fiber grating 120 can be protected by the encapsulation sheath 130, and at the same time, the optical fiber body 110 can also be supported.
Optionally, the material of the package outer sheath 130 is a metal material, that is, the optical fiber body 110 and the fiber grating 120 are packaged in a metallization manner for protection and support. The outer casing 130 may be a stainless steel tube.
Optionally, the optical fiber measurement component 100 using the metallization package has a small overall wire diameter, which can generally reach 0.5mm to 6mm, and includes: 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, etc., and the specific wire diameter of the optical fiber measurement assembly 100 is not limited in the embodiments of the present application. Based on the above arrangement, the optical fiber measurement assembly 100 has good flexibility and good bending performance.
In order to realize the monitoring of the temperature of the main body 300 to be measured, the temperature measuring apparatus in the embodiment of the present application further includes a control unit, wherein the laser modulator 200 is connected with the control unit for information interaction. Alternatively, the laser modulator 200 may interact or communicate with a data monitoring and control center in various ways, such as fiber, coaxial cable, or RJ45 network cable interface.
With reference to fig. 1 to 6, an embodiment of the present application further discloses a temperature measurement method, where the disclosed temperature measurement method includes:
s101: emitting laser to the optical fiber body 110 through the laser modulator 200, and transmitting the laser to the fiber grating 120 along the optical fiber body 110;
s102: emitting laser light through the fiber grating 120 and returning the laser light along the fiber body 110;
s103: the laser modulator 200 receives the returned laser and demodulates the laser to obtain a temperature value of the temperature measuring point corresponding to the fiber grating 120.
In the embodiment of the present application, the fiber grating 120 is disposed on the main body 300 to be measured, and the fiber grating 120 is connected to the fiber body 110, so that the laser emitted by the laser modulator 200 can be transmitted to the fiber grating 120 through the fiber body 110, and after reaching the fiber grating 120, the laser is reflected by the fiber grating 120, then returns along the fiber body 110, and is received and demodulated by the laser modulator 200. In the above process, when the temperature of the temperature measurement point corresponding to the fiber grating 120 changes, the period of the grating stripe of the fiber grating 120 changes due to the expansion with heat and contraction with cold, so that the wavelength of the laser reflected by the fiber grating 120 changes, and the returned laser is demodulated by the laser modulator 200 to display the temperature value of the temperature measurement point, thereby implementing the temperature measurement.
In summary, the embodiment of the application can solve the problems that the conventional temperature measurement system is complex in whole, long in guide wire, high in cost, incapable of achieving comprehensive coverage, incapable of comprehensively monitoring temperature and incapable of avoiding blasting due to overtemperature; the temperature measurement scheme provided by the embodiment of the application is easy to realize, low in cost and mature in technology, can realize comprehensive monitoring of the main body 300 to be measured, is not limited to a high-temperature heating surface, and can also be suitable for a low-temperature heating surface and the like.
In the embodiment of the application, when the temperature measuring device is applied to a boiler to measure the temperature of the boiler tube of the boiler, the temperature of all the boiler tubes can be detected, so that reliable technical analysis data are provided for boiler combustion, analysis of the temperature field in the boiler, analysis of hydrodynamic characteristics of the boiler tube, shedding and generation of oxide skin of the high-temperature boiler tube, and various heat deviations and uneven causes. Through the analysis of the wall temperature of the fully-covered furnace tube, the overtemperature furnace tube is found in time, so that corresponding measures are taken to prevent the furnace tube from exploding due to overheating, and the unplanned shutdown of the unit caused by the overheating and exploding of the furnace tube is fundamentally avoided, thereby providing reliable guarantee for the safe, economical and stable operation of enterprises.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A temperature measuring device for measuring the temperature of a main body (300) to be measured, comprising:
the optical fiber measuring assembly (100), the optical fiber measuring assembly (100) comprises an optical fiber body (110) and a fiber grating (120), the optical fiber body (110) is provided with a plurality of the fiber gratings (120), the main body (300) to be measured comprises a pipeline (310), and at least one fiber grating (120) is arranged on the side wall of the pipeline (310);
the laser modulator (200), the laser modulator (200) is connected with the optical fiber body (110) and is used for emitting laser or receiving laser;
wherein, the laser emitted by the laser modulator (200) is transmitted to the fiber grating (120) along the fiber body (110), reflected by the fiber grating (120) and returned along the fiber body (110), and the returned laser is received and demodulated by the laser modulator (200).
2. The temperature measuring device according to claim 1, characterized in that it comprises a set of said optical fiber measuring assemblies (100), said body to be measured (300) comprising a plurality of said conduits (310) arranged side by side;
the optical fiber body (110) in the optical fiber measurement assembly (100) extends along the arrangement direction of the plurality of pipelines (310), and the plurality of fiber gratings (120) on the optical fiber body (110) are correspondingly connected with the plurality of pipelines (310) one by one.
3. The temperature measuring device according to claim 1, wherein the temperature measuring device comprises a plurality of sets of the optical fiber measuring assemblies (100), the main body (300) to be measured comprises a plurality of the pipes (310) arranged in parallel, and the plurality of sets of the optical fiber measuring assemblies (100) are arranged at intervals along the extending direction of any one of the pipes (310);
the optical fiber body (110) in each group of the optical fiber measuring assembly (100) extends along the arrangement direction of the plurality of pipelines (310), and the plurality of optical fiber gratings (120) on the optical fiber body (110) are correspondingly connected with the plurality of pipelines (310) one by one.
4. The temperature measuring device according to claim 1, characterized in that it comprises a set of said optical fiber measuring assemblies (100);
the optical fiber body (110) in the optical fiber measuring assembly (100) extends along the length direction of the pipeline (310), and a plurality of optical fiber gratings (120) on the optical fiber body (110) are connected to the side wall of the pipeline (310) at intervals.
5. The temperature measuring device according to claim 1, wherein the temperature measuring device comprises a plurality of sets of the optical fiber measuring assemblies (100), the main body (300) to be measured comprises a plurality of the conduits (310) arranged in parallel, and each set of the optical fiber measuring assemblies (100) corresponds to each conduit (310);
the optical fiber body (110) in each set of the optical fiber measurement assembly (100) extends along the length direction of the corresponding pipeline (310), and the plurality of optical fiber gratings (120) on the optical fiber body (110) are connected to the side wall of the pipeline (310) at intervals.
6. The temperature measuring device according to any one of claims 1 to 5, wherein the distance between two adjacent fiber gratings (120) is greater than or equal to 7 mm.
7. The temperature measuring device according to any one of claims 1 to 5, wherein a sidewall of the pipe (310) is provided with a heat collecting block (400), and the fiber grating (120) is fixed to the heat collecting block (400);
or the fiber grating (120) is fixed on the side wall of the pipeline (310) in a welding, bonding, binding or clamping manner.
8. The temperature measurement device of claim 1, wherein the fiber optic measurement assembly (100) further comprises an encapsulating jacket (130);
the packaging outer sleeve (130) is coated on the outer side of the optical fiber body (110), and/or the packaging outer sleeve (130) is made of metal.
9. The temperature measurement device of claim 1, wherein the fiber optic measurement assembly (100) has an outer diameter dimension in a range of 0.5mm to 6 mm.
10. The temperature measuring device according to claim 1, characterized in that the temperature measuring device further comprises a control unit, the laser modulator (200) being connected to the control unit for information interaction.
11. A temperature measuring method applied to the temperature measuring apparatus according to any one of claims 1 to 10, characterized in that the temperature measuring method comprises:
emitting laser light to the optical fiber body (110) through the laser modulator (200), and transmitting the laser light to the fiber grating (120) along the optical fiber body (110);
reflecting the laser light through the fiber grating (120) and returning the laser light along the fiber body (110);
and receiving the returned laser through the laser modulator (200) and demodulating to obtain the temperature value of the temperature measuring point corresponding to the fiber bragg grating (120).
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| CN202110852976.1A CN113588120A (en) | 2021-07-27 | 2021-07-27 | Temperature measuring device and temperature measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116399470A (en) * | 2023-02-28 | 2023-07-07 | 国能锅炉压力容器检验有限公司 | Device and method for monitoring temperature of fire side of water-cooled wall of power station boiler |
-
2021
- 2021-07-27 CN CN202110852976.1A patent/CN113588120A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116399470A (en) * | 2023-02-28 | 2023-07-07 | 国能锅炉压力容器检验有限公司 | Device and method for monitoring temperature of fire side of water-cooled wall of power station boiler |
| CN116399470B (en) * | 2023-02-28 | 2023-09-26 | 国能锅炉压力容器检验有限公司 | Device and method for monitoring temperature of fire side of water-cooled wall of power station boiler |
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