CN116481679B - Stress monitoring device and stress monitoring method for fire side of water-cooled wall of power station boiler - Google Patents
Stress monitoring device and stress monitoring method for fire side of water-cooled wall of power station boiler Download PDFInfo
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- CN116481679B CN116481679B CN202310195698.6A CN202310195698A CN116481679B CN 116481679 B CN116481679 B CN 116481679B CN 202310195698 A CN202310195698 A CN 202310195698A CN 116481679 B CN116481679 B CN 116481679B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000012806 monitoring device Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000013307 optical fiber Substances 0.000 claims abstract description 115
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000523 sample Substances 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 28
- 239000000835 fiber Substances 0.000 claims description 11
- 230000005483 Hooke's law Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 9
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- 238000005452 bending Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000897 Babbitt (metal) Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical group [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
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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
Abstract
The application relates to the technical field of power generation, and provides a stress monitoring device for a fire side of a water cooling wall of a power station boiler, which comprises the following components: distance measurement heat collection block and temperature measurement heat collection block; the distance measurement heat collection block is provided with a distance measurement blind hole, and the temperature measurement heat collection block is provided with a temperature measurement blind hole; the range finder is used for detecting the depth of the ranging blind hole and obtaining a depth value of the ranging blind hole; the ranging optical fiber is used for transmitting the depth value of the ranging blind hole through a depth optical signal; the temperature measuring end of the temperature measuring optical fiber is provided with a temperature sensing probe which is used for detecting the temperature in the temperature measuring blind hole and obtaining the temperature value of the temperature measuring blind hole; the temperature measuring optical fiber is used for transmitting the temperature value of the temperature measuring blind hole through a temperature optical signal; the monitoring processor is used for processing the depth optical signal and the temperature optical signal to obtain a corresponding depth value L 1 And a temperature value T 1 . The stress monitoring device and the stress monitoring method for the fire side of the water-cooled wall of the power station boiler, provided by the application, solve the problem that a detecting instrument in the prior art cannot work in a severe environment to detect the stress of the water-cooled wall.
Description
Technical Field
The application relates to the technical field of power generation, in particular to a stress monitoring device and a stress monitoring method for a fire side of a water-cooled wall of a power station boiler.
Background
At present, the power supply in China still takes coal-fired power generation as the main part, the operation parameters of the generator set are improved to become the necessary trend of the coal-fired generator set, and the high operation parameters put higher requirements on the service safety of high-temperature pressure-bearing metal parts of the generator set. With the large-scale application of renewable energy power generation technology, the influence of renewable energy sources mainly including wind and light on the fluctuation of power supply is more obvious, the coal-fired power generator set is more deeply involved in peak shaving, but the variable load operation also has negative influence on the safety and service life of the metal parts of the unit. Under the conditions of high-parameter operation and deep peak regulation operation of a generator set, a novel challenge is provided for metal technical supervision of a power station boiler, combustion in a hearth of the power station boiler is unstable easily caused by complex working condition operation, the problems of overtemperature operation, low-cycle fatigue damage, accelerated oxide skin generation, falling-off and other metal damage of a heating surface of a water-cooled tube of the power station boiler occur, and as is well known, the main factors causing damage of metal components of the power station are temperature, stress, strain and operation time, so that the factors causing damage of the metal components of the power station need to be monitored.
The water vapor mixture in the water cooling pipe of the power station boiler heats the flowing water vapor mixture in the water cooling pipe in the modes of combustion flame, high-temperature flue gas radiation, convection and the like in a hearth, the temperature of the high-temperature flue gas in the hearth is about 1200 ℃, the temperature in a heating surface pipe is between 450 and 650 ℃, the environment such as ultra-high temperature, high wind speed and fly ash slag in the hearth is extremely bad, the traditional high-temperature strain gauge, the mechanical extensometer and the video dynamic strain measurement system are not suitable for measuring the internal stress of the boiler, the damage such as fatigue, corrosion and stretch crack of the heating surface of the water cooling pipe are directly related to the deformation of materials, and the traditional instrument for measuring the stress cannot work in such bad environment, so that a device and a method for monitoring the stress of the water cooling wall of the power station boiler are needed to solve at least one problem.
Disclosure of Invention
The embodiment of the application aims to provide a stress monitoring device and a stress monitoring method for a fire side of a water-cooled wall of a power station boiler, which are used for solving the problem that a detecting instrument in the prior art cannot work in a severe environment to detect the stress of a wall of a water-cooled tube on the fire side.
In order to achieve the above object, according to one aspect of the present application, there is provided a stress monitoring device for a fire side of a water-cooled wall of a utility boiler, for monitoring a stress variation of a wall of a water-cooled tube facing the fire side of a furnace, wherein a plurality of water-cooled tubes are arranged in parallel and enclose each other to form the furnace, and adjacent water-cooled tubes are connected by fins, the stress monitoring device comprising:
the distance measurement heat collection block and the temperature measurement heat collection block are arranged on the wall of one of the water cooling pipes on the fire side; the distance measuring heat collection block is provided with a distance measuring blind hole with a first given depth, and the temperature measuring heat collection block is provided with a temperature measuring blind hole with a third given depth;
the range finder is used for detecting the depth of the range blind hole and obtaining a depth value of the range blind hole;
the ranging optical fiber is provided with a detection end, and the detection end stretches into the second depth position in the ranging blind hole; the distance measuring optical fiber is used for transmitting the depth value of the distance measuring blind hole through a depth optical signal;
the temperature measuring optical fiber is provided with a temperature measuring end, and the temperature measuring end stretches into a fourth depth position in the temperature measuring blind hole; the temperature measuring end of the temperature measuring optical fiber is provided with a temperature sensing probe which is used for detecting the temperature in the temperature measuring blind hole and obtaining the temperature value of the temperature measuring blind hole; the temperature measuring optical fiber is used for sending the temperature value of the temperature measuring blind hole through a temperature optical signal;
a monitoring processor for processing the depth light signal and the temperature light signal from the ranging fiber and the temperature measuring fiber to obtain a corresponding depth value L 1 And a temperature value T 1 。
Specifically, the range finder includes: the laser transmitter and the receiving and transmitting probe are arranged at the detection end of the ranging optical fiber;
the laser transmitter is arranged outside the hearth and connected with the ranging optical fiber, the laser transmitter transmits detection light into the ranging blind hole through the ranging optical fiber and the receiving and transmitting probe, and the receiving and transmitting probe is used for receiving reflected light from the bottom of the ranging blind hole and converting the reflected light into a depth light signal to obtain a depth value.
Specifically, two threading holes are formed in one fin, and the detection end of the ranging optical fiber enters the hearth through one threading hole and extends into the ranging blind hole;
the temperature measuring end of the temperature measuring optical fiber enters the hearth through the other threading hole and extends into the temperature measuring blind hole.
Specifically, the part of the ranging optical fiber which is positioned in the hearth and exposed outside the ranging blind hole and the part of the temperature measuring optical fiber which is positioned in the hearth and exposed outside the temperature measuring blind hole are coated with a protective layer.
Specifically, the stress monitoring device further includes: and the sealing piece is arranged at the orifice of the ranging blind hole and the orifice of the temperature measuring blind hole.
Specifically, set up on the range finding thermal-arrest piece with the gas pocket of range finding blind hole intercommunication, set up on the temperature measurement thermal-arrest piece with the gas pocket of temperature measurement blind hole intercommunication.
Specifically, the trend of the welding seam between the distance measuring heat collecting block and the water cooling pipe where the distance measuring heat collecting block is located and the trend of the welding seam between the temperature measuring heat collecting block and the water cooling pipe where the temperature measuring heat collecting block is located are the same as the extending direction of the corresponding water cooling pipe.
Specifically, the distance measuring heat collecting block, the temperature measuring heat collecting block and the fins are made of the same material.
Another aspect of the present application provides a method for monitoring stress on a fire side of a water wall of a utility boiler, which is implemented based on a monitoring device according to any one of the preceding claims, the method for monitoring stress comprising:
the distance meter detects the depth of the distance measuring blind hole in real time to obtain a depth value of the distance measuring blind hole, and sends the depth value of the distance measuring blind hole to the monitoring processor as a depth light signal through the distance measuring optical fiber;
the temperature sensing probe detects the temperature in the temperature measuring blind hole in real time to obtain the temperature value of the temperature measuring blind hole, and the temperature value of the temperature measuring blind hole is used as a temperature light signal to be sent to the monitoring processor through the temperature measuring optical fiber;
the monitoring processor processes the depth light signal from the ranging optical fiber and the temperature light signal of the temperature measuring optical fiber to obtain a corresponding depth value L 1 And a temperature value T 1 ；
According to the acquired temperature value T 1 Obtaining the temperature value T 1 Corresponding elastic modulus E, according to the obtained depth value L 1 Calculating strain epsilon:
ε＝(L 1 -L 0 )/L 0 wherein L is 0 The depth of the blind hole is measured;
and calculating the stress value of the water-cooled tube to the fire side according to Hooke's law: σ=e×ε.
Specifically, the method further comprises:
plugging and fixing the detection end of the ranging optical fiber in the ranging blind hole;
and plugging and fixing the temperature measuring end of the temperature measuring optical fiber at the orifice of the temperature measuring blind hole.
The application provides a stress monitoring device for a fire side of a water-cooled wall of a power station boiler, wherein a distance measuring heat collecting block and a temperature measuring heat collecting block are respectively arranged on a fire side pipe wall of a selected water-cooled pipe, a distance measuring optical fiber and a temperature measuring optical fiber are introduced, a detection end of the distance measuring optical fiber extends into a second depth position in a distance measuring blind hole of the distance measuring heat collecting block, a temperature measuring end of the temperature measuring optical fiber extends into a fourth depth position in the temperature measuring blind hole, a distance measuring instrument is connected with the distance measuring optical fiber to detect a depth value of the distance measuring blind hole and transmit a depth optical signal corresponding to the detected depth value through the distance measuring optical fiber, a temperature sensing probe is arranged at the temperature measuring end of the temperature measuring optical fiber to detect a temperature value in the temperature measuring blind hole, the temperature value is also the fire side temperature value of the water-cooled pipe, a monitoring processor is connected with the distance measuring optical fiber and the temperature measuring optical fiber through the temperature measuring optical fiber to demodulate the received depth optical signal and the temperature optical signal to obtain a corresponding depth value L 1 And a temperature value T 1 Based on the detected temperature value T 1 Obtaining the temperature value T of the wall of the water-cooled tube on the fire side 1 The corresponding elastic modulus E is according to the depth value L 1 And obtaining the strain epsilon, calculating the stress value of the water-cooled tube on the fire side according to Hooke's law, and detecting the corresponding stress values at different temperatures to obtain the stress change condition of the wall of the water-cooled tube on the fire side.
According to the stress monitoring device and the stress monitoring method for the fire side of the water-cooled wall of the power station boiler, the distance measuring heat collecting block, the distance measuring optical fiber, the distance measuring instrument, the temperature measuring heat collecting block, the temperature measuring optical fiber and the temperature sensing probe are arranged on the wall of the fire side of the same water-cooled tube, so that the stress value at the corresponding temperature is obtained, the problem that the detecting instrument in the prior art cannot work in a severe environment to detect the stress of the wall of the fire side of the water-cooled tube is solved, and the corresponding stress value is obtained by detecting the depth values at different temperatures, so that the stress change of the wall of the fire side of the water-cooled tube is obtained, and an important parameter is provided for safe operation of the power station boiler.
Additional features and advantages of embodiments of the application will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the embodiments of the application. In the drawings:
FIG. 1 is a schematic diagram of an installation structure of a stress monitoring device on a fire side of a water wall of a power station boiler;
fig. 2 is a cross-sectional view of the stress monitoring device on the fire side of the water wall of the utility boiler provided by the application.
Description of the reference numerals
1-a water-cooled tube; 2-distance measuring heat collecting blocks; 3-ranging fiber; 4-receiving and transmitting probes; 5-a temperature measuring heat collecting block; 6-temperature measuring optical fiber; 7-a temperature sensing probe; 8-fins; 10-hearth; 21-a blind ranging hole; 51-temperature measurement blind holes.
Detailed Description
The following describes the detailed implementation of the embodiments of the present application with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.
FIG. 1 is a schematic view of an installation structure of a stress monitoring device on a fire side of a water wall of a utility boiler; fig. 2 is a cross-sectional view of a device for monitoring stress on a fire side of a water-cooled wall of a utility boiler, as shown in fig. 1-2, in one aspect, the application provides a device for monitoring stress on a fire side of a water-cooled wall of a utility boiler, for monitoring stress variation on a fire side wall of a water-cooled tube 1 facing a furnace 10, wherein a plurality of water-cooled tubes 1 are arranged in parallel and enclose each other to form the furnace 10, and adjacent water-cooled tubes 1 are connected by fins 8, the device for monitoring stress comprises:
the distance measurement heat collection block 2 and the temperature measurement heat collection block 5 are arranged on the wall of one water cooling pipe 1 on the fire side; the ranging heat collection block 2 is provided with a ranging blind hole 21 with a first given depth, and the temperature measurement heat collection block 5 is provided with a temperature measurement blind hole 51 with a third given depth;
the distance meter is used for detecting the depth of the distance measuring blind hole 21 and obtaining the depth value of the distance measuring blind hole 21;
a ranging fiber 3 having a detection end which extends into the ranging blind hole 21 at a second depth; the ranging optical fiber 3 is used for transmitting a depth value of the ranging blind hole 21 through a depth optical signal;
the temperature measuring optical fiber 6 is provided with a temperature measuring end, and the temperature measuring end extends into the temperature measuring blind hole 51 at a fourth depth; the temperature measuring end of the temperature measuring optical fiber 6 is provided with a temperature sensing probe 7 for detecting the temperature in the temperature measuring blind hole 51 to obtain the temperature value of the temperature measuring blind hole 51; the temperature measuring optical fiber 6 is used for sending the temperature value of the temperature measuring blind hole 51 through a temperature optical signal;
a monitoring processor for processing the depth light signal and the temperature light signal from the distance measuring optical fiber 3 and the temperature measuring optical fiber 6 to obtain a corresponding depth value L 1 And a temperature value T 1 。
As shown in figures 1 and 2, a distance measuring heat collecting block 2 and a temperature measuring heat collecting block 5 are arranged on the fire side pipe wall of the same water cooling pipe 1, the temperature measuring end of a temperature measuring optical fiber 6 stretches into a fourth depth position in a temperature measuring blind hole 51, a temperature value in the temperature measuring blind hole 51 is detected through a temperature sensing probe 7 arranged at the temperature measuring end of the temperature measuring optical fiber 6, the temperature measuring heat collecting block 5 is attached to the fire side pipe wall of the water cooling pipe 1, the temperature sensing probe 7 is an optical fiber black cavity temperature sensing probe, the temperature value is the same as the fire side temperature value of the pipe wall of the water cooling pipe 1, the detection end of the distance measuring optical fiber 3 stretches into the second depth position in the distance measuring blind hole 21 on the distance measuring heat collecting block 2, the depth value of the distance measuring blind hole 21 is detected through a distance meter connected with the distance measuring optical fiber 3, and the opening depth L of the distance measuring blind hole 21 is detected 0 When the wall temperature of the water-cooled tube 1 on the fire side changes, the depth value of the ranging blind hole 21 on the ranging heat collecting block 2 attached to the water-cooled tube changes due to expansion and contraction, and the ranging blind hole is detected at the corresponding temperatureThe depth value of the hole 21 is transmitted to a monitoring processor in the form of a depth light signal and a temperature light signal through a temperature measuring optical fiber 6 and a distance measuring optical fiber 3 respectively, and the depth light signal and the temperature light signal are demodulated by the monitoring processor to obtain a depth value L 1 And a temperature value T 1 According to the depth value L 1 And a temperature value T 1 The stress of the water-cooled tube 1 to the fire side is calculated, so that the problem that a detecting instrument in the prior art cannot work in a severe environment to detect the stress of the water-cooled wall is solved, the corresponding depth values of the temperature values and the corresponding stress values of the depth values can be obtained through detecting the different temperatures, the stress change of the water-cooled tube 1 to the fire side tube wall is obtained, important parameters are provided for the safe operation of a utility boiler, and the monitoring device can be arranged on the fire side tube wall of the water-cooled tube 1 to be detected according to the detection requirement to detect the stress change of the corresponding water-cooled tube 1 to the fire side.
In one embodiment, in particular, the rangefinder comprises: a laser transmitter and a transceiver probe 4 arranged at the detection end of the ranging optical fiber 3;
the laser transmitter is arranged outside the hearth 10 and connected with the ranging optical fiber 3, the laser transmitter transmits detection light into the ranging blind hole 21 through the ranging optical fiber 3 and the receiving and transmitting probe 4, and the receiving and transmitting probe 4 is used for receiving reflected light from the bottom of the ranging blind hole 21 and converting the reflected light into a depth light signal to obtain a depth value. When the depth value of the ranging blind hole 21 is detected, the laser transmitter is used for coupling detection light in the form of optical signals and transmitting the detection light into the ranging blind hole 21 through the ranging optical fiber 3 and the receiving and transmitting probe 4, the detection light entering the ranging blind hole 21 is received by the receiving and transmitting probe 4 after being reflected by the ranging blind hole 21, the receiving and transmitting probe 4 converts the received reflected light into corresponding depth optical signals again and transmits the corresponding depth optical signals to the monitoring processor through the ranging optical fiber 3, and the monitoring processor demodulates the depth optical signals.
In order to make the ranging optical fiber 3 and the temperature measuring optical fiber 6 enter the hearth 10 for detection, specifically, two threading holes are formed in one fin 8, and the detection end of the ranging optical fiber 3 enters the hearth 10 through one threading hole and extends into the ranging blind hole 21;
the temperature measuring end of the temperature measuring optical fiber 6 enters the hearth 10 through the other threading hole and extends into the temperature measuring blind hole 51. Two threading holes are formed in one fin 8 connected with the water cooling pipe 1 provided with the distance measuring heat collecting block 2 and the temperature measuring heat collecting block 5, and the distance measuring optical fiber 3 and the temperature measuring optical fiber 6 respectively enter the hearth 10 through one threading hole and extend into the corresponding distance measuring blind hole 21 and the corresponding temperature measuring blind hole 51 to carry out corresponding detection.
The environment in the hearth 10 is bad, the ranging optical fiber 3 and the temperature measuring optical fiber 6 are high-temperature resistant quartz optical fibers, the quartz optical fibers have good characteristics of high temperature resistance and acid and alkali resistance, but the impact resistance is extremely bad, so that the flame, smoke and fly ash environment in the hearth 10 are bad, the comprehensive performance of the ranging optical fiber 3 and the temperature measuring optical fiber 6 is improved for better protecting the ranging optical fiber 3 and the temperature measuring optical fiber 6, the ranging optical fiber 3 is positioned in the hearth 10 and exposed out of the ranging blind hole 21, and the temperature measuring optical fiber 6 is positioned in the hearth 10 and exposed out of the temperature measuring blind hole 51, and the protective layer is coated on the ranging optical fiber 3. The double-concentric nonmetallic thermocouple protection tube is used as a protection layer to protect the part of the ranging optical fiber 3 and the temperature measuring optical fiber 6 exposed in the hearth 10, the protection layer is divided into an inner layer and an outer layer, the inner layer is an alumina tube as a main protection tube, the outer layer is a silicon carbide tube as an auxiliary protection tube sleeve, wherein the bending part of the inner layer is formed by combining short protection tubes, and bending is facilitated.
In order to reduce the influence of the temperature in the furnace 10 on the depth of the ranging blind hole 21 and on the temperature in the temperature measuring blind hole 51, the stress monitoring device further comprises: seals are provided at the aperture of the blind ranging hole 21 and at the aperture of the blind thermometric hole 51. After the detection end of the ranging fiber 3 extends into the ranging blind hole 21 and the temperature measuring end of the temperature measuring fiber 6 extends into the temperature measuring blind hole 51, the orifices of the ranging blind hole 21 and the temperature measuring blind hole 51 are sealed by the sealing member, meanwhile, the ranging fiber 3 can be limited at the second depth of the ranging blind hole 21 and the temperature measuring fiber 6 is limited at the fourth depth of the temperature measuring blind hole 51 by the sealing member, and the sealing member is made of laser melting powder.
The temperature of the pipe wall of the water cooling pipe 1 can influence the change of the volume of gas in the ranging blind hole 21 and the temperature measuring blind hole 51, the ranging optical fiber 3 and the temperature measuring optical fiber 6 can be ejected out of the corresponding ranging blind hole 21 and temperature measuring blind hole 51 seriously, in order to ensure that the detection is smoothly carried out, particularly, the ranging heat collecting block 2 is provided with an air hole communicated with the ranging blind hole 21, and the temperature measuring heat collecting block 5 is provided with an air hole communicated with the temperature measuring blind hole 51. The air hole is used for exhausting, so that the air in the ranging blind hole 21 and the temperature measuring blind hole 51 can be timely exhausted from the air hole when the air expands.
Specifically, the trend of the welding seam between the distance measuring heat collecting block 2 and the water cooling pipe 1 where the distance measuring heat collecting block is located and the trend of the welding seam between the temperature measuring heat collecting block 5 and the water cooling pipe 1 where the distance measuring heat collecting block is located are the same as the extending direction of the corresponding water cooling pipe 1. The distance measuring heat collecting block 2 and the temperature measuring heat collecting block 5 are welded on the water-cooled tube 1 in a full-welded mode, the welding angle is 3mm, and when the distance measuring heat collecting block 2, the temperature measuring heat collecting block 5 and the water-cooled tube 1 are welded, the trend of welding seams between the distance measuring heat collecting block 2 and the temperature measuring heat collecting block 5 is the same as the extending direction of the water-cooled tube 1. In order to avoid that the welding seam is torn due to the heated expansion of air in the gap under the condition that gaps exist between the distance measuring heat collecting block 2 and the pipe wall of the temperature measuring heat collecting block 5 and the water cooling pipe 1, the two ends of the distance measuring heat collecting block 2 and the temperature measuring heat collecting block 5, which are perpendicular to the trend of the welding seam, are not welded, so that the situation that gaps exist between the two ends of the distance measuring heat collecting block 2 and the temperature measuring heat collecting block 5, which are not welded, and the water cooling pipe 1 after the air in the gaps is heated is ensured, and the welding seam is prevented from being torn.
In order to make the ranging heat collecting block 2 and the temperature measuring heat collecting block 5 have better service life, the ranging heat collecting block 2 and the temperature measuring heat collecting block 5 are made of the same material as the fins 8.
Another aspect of the present application provides a method for monitoring stress on a fire side of a water wall of a utility boiler, which is implemented based on a monitoring device according to any one of the preceding claims, the method for monitoring stress comprising:
the distance meter detects the depth of the distance measuring blind hole 21 in real time to obtain a depth value of the distance measuring blind hole 21, and sends the depth value of the distance measuring blind hole 21 to the monitoring processor as a depth light signal through the distance measuring optical fiber 3;
the temperature sensing probe 7 detects the temperature in the temperature measuring blind hole 51 in real time to obtain the temperature value of the temperature measuring blind hole 51, and sends the temperature value of the temperature measuring blind hole 51 to the monitoring processor as a temperature light signal through the temperature measuring optical fiber 6;
the monitoring processor processes the depth light signal from the distance measuring optical fiber 3 and the temperature light signal of the temperature measuring optical fiber 6 to obtain a corresponding depth value L 1 And a temperature value T 1 ；
According to the acquired temperature value T 1 Obtaining the temperature value T 1 Corresponding elastic modulus E, according to the obtained depth value L 1 Calculating strain epsilon:
ε＝(L 1 -L 0 )/L 0 wherein L is 0 The opening depth of the blind hole 21 is measured;
the stress value of the water-cooled tube 1 on the fire side is calculated according to Hooke's law: σ=e×ε.
According to the method for monitoring the stress of the fire side of the water-cooled wall of the power station boiler, as shown in figure 1, a distance measuring heat collecting block 2 and a temperature measuring heat collecting block 5 are arranged on the wall of the fire side of the same water-cooled tube 1, and the depth of a distance measuring blind hole 21 formed in the distance measuring heat collecting block 2 is known as L 0 The depth value of the ranging blind hole 21 will change due to the temperature change of the fire side of the water cooling pipe 1, after the detection end of the ranging optical fiber 3 extends into the second depth position of the ranging blind hole 21, the depth value of the ranging blind hole 21 is detected in real time by the range finder, the temperature sensing probe 7 detects the temperature value in the ranging blind hole 51, the temperature measuring heat collecting block 5 is attached to the water cooling pipe 1, therefore the temperature value of the temperature measuring blind hole 51 in the temperature measuring heat collecting block 5 is the temperature value of the water cooling pipe 1, in this way, the temperature value of the water cooling pipe 1 is detected by the temperature sensing probe 7, and is sent to the monitoring processor in the form of a temperature light signal through the temperature measuring optical fiber 6, the depth value of the ranging blind hole 21 detected by the range finder under the corresponding temperature is sent to the monitoring processor in the form of a depth light signal through the ranging optical fiber 3, and the monitoring processor obtains the real-time depth value L after demodulation processing 1 And a temperature value T 1 According to the temperature value T 1 The elastic modulus E can be obtained according to the depth value L 1 And calculating to obtain strain epsilon, and substituting epsilon and elastic modulus E into Hooke's law to obtain the stress value sigma of the water-cooled tube 1 on the fire side.
In order to limit the distance measuring fiber 3 at the second depth of the distance measuring blind hole 21 and to limit the temperature measuring fiber 6 at the fourth depth of the temperature measuring blind hole 51, in particular, the method further comprises:
plugging and fixing the detection end of the ranging optical fiber 3 in the ranging blind hole 21;
and the temperature measuring end of the temperature measuring optical fiber 6 is blocked and fixed at the orifice of the temperature measuring blind hole 51. The orifices of the ranging blind hole 21 and the temperature measuring blind hole 51 are plugged by laser melting powder, and the laser melting powder plugged in the orifices of the ranging blind hole 21 and the temperature measuring blind hole 51 forms a sealing piece, so that the orifices are plugged, and meanwhile, the ranging optical fiber 3 and the temperature measuring optical fiber 6 are fixed.
The application provides a stress monitoring device for a fire side of a water-cooled wall of a power station boiler, wherein a distance measuring heat collecting block and a temperature measuring heat collecting block are respectively arranged on a fire side pipe wall of a selected water-cooled pipe, a distance measuring optical fiber and a temperature measuring optical fiber are introduced, a detection end of the distance measuring optical fiber extends into a second depth position in a distance measuring blind hole of the distance measuring heat collecting block, a temperature measuring end of the temperature measuring optical fiber extends into a fourth depth position in the temperature measuring blind hole, a distance measuring instrument is connected with the distance measuring optical fiber to detect a depth value of the distance measuring blind hole and transmit a depth optical signal corresponding to the detected depth value through the distance measuring optical fiber, a temperature sensing probe is arranged at the temperature measuring end of the temperature measuring optical fiber to detect a temperature value in the temperature measuring blind hole, the temperature value is also the fire side temperature value of the water-cooled pipe, a monitoring processor is connected with the distance measuring optical fiber and the temperature measuring optical fiber through the temperature measuring optical fiber to demodulate the received depth optical signal and the temperature optical signal to obtain a corresponding depth value L 1 And a temperature value T 1 Based on the detected temperature value T 1 Obtaining the temperature value T of the wall of the water-cooled tube on the fire side 1 The corresponding elastic modulus E is according to the depth value L 1 Acquiring strain epsilon, calculating stress value of the fire side of the water-cooled tube according to Hooke's law, and detecting corresponding stress at different temperaturesThe value can be used for obtaining the stress change condition of the wall of the water-cooled tube towards the fire side.
According to the stress monitoring device and the stress monitoring method for the fire side of the water-cooled wall of the power station boiler, the distance measuring heat collecting block, the distance measuring optical fiber, the distance measuring instrument, the temperature measuring heat collecting block, the temperature measuring optical fiber and the temperature sensing probe are arranged on the wall of the fire side of the same water-cooled tube, so that the stress value at the corresponding temperature is obtained, the problem that the detecting instrument in the prior art cannot work in a severe environment to detect the stress of the wall of the fire side of the water-cooled tube is solved, and the corresponding stress value is obtained by detecting the depth values at different temperatures, so that the stress change of the wall of the fire side of the water-cooled tube is obtained, and an important parameter is provided for safe operation of the power station boiler.
The foregoing details of the optional implementation of the embodiment of the present application have been described in detail with reference to the accompanying drawings, but the embodiment of the present application is not limited to the specific details of the foregoing implementation, and various simple modifications may be made to the technical solution of the embodiment of the present application within the scope of the technical concept of the embodiment of the present application, and these simple modifications all fall within the protection scope of the embodiment of the present application.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations of embodiments of the present application are not described in detail.
Those skilled in the art will appreciate that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program stored in a storage medium, including instructions for causing a single-chip microcomputer, chip or processor (processor) to perform all or part of the steps of the methods of the embodiments described herein. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In addition, any combination of various embodiments of the present application may be performed, so long as the concept of the embodiments of the present application is not violated, and the disclosure of the embodiments of the present application should also be considered.
Claims (10)
1. The utility model provides a power plant boiler water-cooling wall is to stress monitoring devices of fireside for monitor the stress variation of the pipe wall of fireside of water-cooled tube (1) towards furnace (10), many water-cooled tube (1) parallel arrangement just enclose and close each other and form furnace (10), connect through fin (8) between adjacent water-cooled tube (1), its characterized in that, stress monitoring devices includes:
the distance measurement heat collection block (2) and the temperature measurement heat collection block (5) are arranged on the wall of one water cooling pipe (1) on the fire side; a ranging blind hole (21) with a first given depth is formed in the ranging heat collection block (2), and a temperature measurement blind hole (51) with a third given depth is formed in the temperature measurement heat collection block (5);
the distance meter is used for detecting the depth of the distance measuring blind hole (21) and obtaining a depth value of the distance measuring blind hole (21);
a ranging fiber (3) having a detection end which extends into the ranging blind hole (21) at a second depth; the distance measuring optical fiber (3) is used for transmitting the depth value of the distance measuring blind hole (21) through a depth optical signal;
the temperature measuring optical fiber (6) is provided with a temperature measuring end, and the temperature measuring end stretches into a fourth depth position in the temperature measuring blind hole (51); the temperature measuring end of the temperature measuring optical fiber (6) is provided with a temperature sensing probe (7) for detecting the temperature in the temperature measuring blind hole (51) to obtain the temperature value of the temperature measuring blind hole (51); the temperature measuring optical fiber (6) is used for sending the temperature value of the temperature measuring blind hole (51) through a temperature optical signal;
a monitoring processor for processing the depth light signal and the temperature light signal from the distance measuring optical fiber (3) and the temperature measuring optical fiber (6) to obtain a corresponding depth value L 1 And a temperature value T 1 。
2. The utility boiler water wall fire side stress monitoring device of claim 1, wherein the rangefinder comprises: a laser transmitter and a receiving and transmitting probe (4) arranged at the detection end of the ranging optical fiber (3);
the laser transmitter is arranged outside the hearth (10) and is connected with the ranging optical fiber (3), the laser transmitter transmits detection light into the ranging blind hole (21) through the ranging optical fiber (3) and the receiving and transmitting probe (4), and the receiving and transmitting probe (4) is used for receiving reflected light from the bottom of the ranging blind hole (21) and converting the reflected light into a depth light signal to obtain a depth value.
3. The power station boiler water wall fire side stress monitoring device according to claim 1, wherein two threading holes are formed in one fin (8), and the detection end of the ranging optical fiber (3) enters the hearth (10) through one threading hole and extends into the ranging blind hole (21);
the temperature measuring end of the temperature measuring optical fiber (6) enters the hearth (10) through the other threading hole and stretches into the temperature measuring blind hole (51).
4. The power station boiler water wall fire side stress monitoring device according to claim 2, characterized in that a protection layer is coated on the part of the ranging optical fiber (3) which is positioned in the hearth (10) and exposed outside the ranging blind hole (21) and the part of the temperature measuring optical fiber (6) which is positioned in the hearth (10) and exposed outside the temperature measuring blind hole (51).
5. The utility boiler water wall fire side stress monitoring device of claim 1, wherein the stress monitoring device further comprises: and the sealing piece is arranged at the orifice of the ranging blind hole (21) and the orifice of the temperature measuring blind hole (51).
6. The power station boiler water wall fire side stress monitoring device according to claim 1, wherein the distance measuring heat collecting block (2) is provided with air holes communicated with the distance measuring blind holes (21), and the temperature measuring heat collecting block (5) is provided with air holes communicated with the temperature measuring blind holes (51).
7. The power station boiler water wall fire side stress monitoring device according to claim 1, wherein the weld trend between the distance measuring heat collecting block (2) and the water cooling pipe (1) where the distance measuring heat collecting block is located and the weld trend between the temperature measuring heat collecting block (5) and the water cooling pipe (1) where the temperature measuring heat collecting block is located are the same as the extending direction of the corresponding water cooling pipe (1).
8. The power station boiler water wall fire side stress monitoring device according to claim 1, wherein the distance measuring heat collecting block (2) and the temperature measuring heat collecting block (5) are made of the same material as the fins (8).
9. A method for monitoring stress on fire side of water-cooled wall of power station boiler based on the monitoring device of any one of claims 1-8, characterized in that the method for monitoring stress comprises:
the distance meter detects the depth of the distance measuring blind hole (21) in real time, obtains the depth value of the distance measuring blind hole (21), and sends the depth value of the distance measuring blind hole (21) to the monitoring processor as a depth light signal through the distance measuring optical fiber (3);
the temperature sensing probe (7) detects the temperature in the temperature measuring blind hole (51) in real time, obtains the temperature value of the temperature measuring blind hole (51), and sends the temperature value of the temperature measuring blind hole (51) to the monitoring processor as a temperature light signal through the temperature measuring optical fiber (6);
the monitoring processor processes the depth light signal from the distance measuring optical fiber (3) and the temperature light signal of the temperature measuring optical fiber (6) to obtain a corresponding depth value L 1 And a temperature value T 1 ；
According to the acquired temperature value T 1 Obtaining the temperature value T 1 Corresponding elastic modulus E, according to the obtained depth value L 1 Calculating strain epsilon:
ε＝(L 1 -L 0 )/L 0 wherein L is 0 The depth of the blind hole (21) is measured;
calculating the stress value of the water-cooled tube (1) towards the fire side according to Hooke's law: σ=e×ε.
10. The method for monitoring the stress on the fire side of a utility boiler water wall according to claim 9, further comprising:
plugging and fixing the detection end of the ranging optical fiber (3) in the ranging blind hole (21);
and plugging and fixing the temperature measuring end of the temperature measuring optical fiber (6) at the orifice of the temperature measuring blind hole (51).
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