CN116399470B - Device and method for monitoring temperature of fire side of water-cooled wall of power station boiler - Google Patents
Device and method for monitoring temperature of fire side of water-cooled wall of power station boiler Download PDFInfo
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- CN116399470B CN116399470B CN202310215038.XA CN202310215038A CN116399470B CN 116399470 B CN116399470 B CN 116399470B CN 202310215038 A CN202310215038 A CN 202310215038A CN 116399470 B CN116399470 B CN 116399470B
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- 238000001816 cooling Methods 0.000 claims abstract description 46
- 239000000523 sample Substances 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000012806 monitoring device Methods 0.000 claims abstract description 26
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- 238000009434 installation Methods 0.000 claims description 5
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
- G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
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- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The application relates to the technical field of power generation, and provides a device for monitoring the temperature of a fire side of a water-cooled wall of a power station boiler, which comprises the following components: the heat collecting blocks are arranged on the wall of the fire-facing side of the water cooling pipes to be tested; the temperature measuring optical fiber is provided with a temperature measuring grating which is used for detecting the temperature of the pipe wall of the fire side of the water cooling pipe to be detected and converting the temperature into a first optical signal; the temperature sensing probe is arranged in the detection blind hole of the heat collecting block and is used for detecting the pipe wall temperature of the fire side of the water cooling pipe to be detected, where the corresponding heat collecting block is located, and converting the pipe wall temperature into a second optical signal; and the processor is used for receiving the first optical signal and the second optical signal, and filtering, converting and demodulating the first optical signal and the second optical signal to obtain corresponding temperature values. The application also provides a monitoring method, and the monitoring device and the monitoring method solve the problem that thermocouple monitoring equipment is easy to fail due to overhigh temperature in a power station boiler in the prior art, so that a worker guides a generator set to carry out parameter adjustment according to the obtained temperature value.
Description
Technical Field
The application relates to the technical field of power generation, in particular to a device and a method for monitoring the temperature of a fire side of a water-cooled wall of a power station boiler.
Background
In the present stage, the power supply of China still takes coal-fired power generation as the main part, and in order to realize the national development targets of 'carbon peak and carbon neutralization', the high efficiency and cleanliness are the necessary development targets of the coal-fired power generation technology, so that the improvement of the operation parameters of the generator set becomes 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 the metal technical supervision of a power station boiler, the combustion in a hearth of the power station boiler is easy to be unstable due to the complex working condition operation, the problems of overtemperature operation, low-cycle fatigue damage, accelerated oxide skin generation, falling and other metal damage problems occur on a heating surface of a fire side of the power station boiler, the main factors causing damage to metal components of the power station are temperature, stress, strain and operation time are well known, therefore, the factors causing damage to the metal components of the power station, especially the temperature factors, are required to be monitored, a water vapor mixture flowing in the water cooling pipe of the power station boiler is heated by means of over-radiation, convection and the like by means of combustion flame and high-temperature flue gas in the hearth, the temperature of the high-temperature flue gas in the hearth is about 1200 ℃, the temperature in the heating surface of the heating pipe is between 450 and 650 ℃, and the pipe wall temperature of the fire side of the water cooling pipe is calculated by a pipe seat thermocouple which is arranged near a large package outside the hearth of the power station boiler according to an empirical formula. The temperature measurement of the inner tube wall of the hearth can also be carried out by adopting a noble metal alloy armored thermocouple, but the monitoring equipment is expensive and is not suitable for the environments of high temperature, high wind speed, fly ash slag abrasion and the like of a water cooling tube in the hearth, the noble metal alloy armored thermocouple is generally invalid within 2 months, and the replacement of the noble metal alloy armored thermocouple can only be completed under the working condition of a shutdown (the general shutdown maintenance period is 1 year), so that a monitoring blind area is caused in time, and the safe operation of the boiler is free from support.
Accordingly, there is a need for a temperature monitoring device and method for monitoring a utility boiler water wall that addresses at least one of the problems described above.
Disclosure of Invention
The embodiment of the application aims to provide a device and a method for monitoring the temperature of a fire side of a water-cooled wall of a power station boiler, which are used for solving the problem that thermocouple monitoring equipment in the power station boiler is easy to fail due to overhigh temperature in the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a monitoring device for monitoring a fire side temperature of a water wall of a utility boiler, the monitoring device being configured to detect a wall temperature of a fire side of a plurality of water-cooled tubes facing a furnace, wherein the plurality of water-cooled tubes are disposed parallel to each other and enclose to form the furnace, and two adjacent water-cooled tubes are connected through a fin, the monitoring device comprising:
the heat collecting blocks are arranged on the fire side pipe walls of the water cooling pipes to be tested, and each heat collecting block is provided with a threading through hole, wherein one heat collecting block is also provided with a detection blind hole communicated with the threading through hole on the heat collecting block, and the opening end of the detection blind hole is arranged on one surface of the heat collecting block, which is contacted with the pipe wall of the corresponding water cooling pipe to be tested;
the temperature measuring optical fiber is arranged in the threading through hole of each heat collecting block in a penetrating way, wherein a temperature measuring grating is arranged at the part of the temperature measuring optical fiber which is arranged in the threading through hole of each heat collecting block in a penetrating way and is used for detecting the wall temperature of the fire side of each corresponding water cooling pipe to be detected and converting the detected wall temperature into a first optical signal; the temperature measuring optical fiber is used for transmitting the first optical signal;
the temperature sensing probe is arranged in the detection blind hole and is used for detecting the wall temperature of the fire side of the water cooling pipe to be detected, where the corresponding heat collecting block is located, and converting the detected wall temperature into a second optical signal, the temperature sensing probe is connected with the temperature measuring optical fiber, and the temperature measuring optical fiber is also used for transmitting the second optical signal;
and the processor is used for receiving the first optical signal and the second optical signal, and filtering, converting and demodulating the first optical signal and the second optical signal to obtain corresponding temperature values.
Specifically, an access hole is formed in one fin, and the temperature measuring optical fiber enters the hearth through the access hole and penetrates through the threading through hole in each heat collecting block.
Specifically, the setting height of business turn over hole is higher than the installation height of the heat collection piece that first threading through-hole that temperature measurement optic fibre was worn to establish is located.
Specifically, the monitoring device further includes: and the part of the temperature measuring optical fiber which is positioned in the hearth and exposed outside the threading through hole is coated with a protective layer.
In particular, the protective layer is made of a double layer thermocouple protective tube.
Specifically, each heat collecting block is welded on the wall of the fire side of the corresponding water cooling pipe to be tested.
Specifically, the extending direction of the threading through holes formed in each heat collecting block is the same as the extending direction of the water cooling pipe.
Specifically, the processor includes: the device comprises a photoelectric detector, an analog-to-digital converter, a computer and two optical filter light paths, wherein each optical filter light path is provided with a narrow-band interference optical filter;
each optical filter path filters wavelength light corresponding to the first optical signal and the second optical signal through a set narrow-band interference filter;
the photoelectric detector is connected with the two optical filter light paths and is used for converting wavelength light corresponding to the filtered first optical signal and the filtered second optical signal into corresponding voltage signals;
the analog-to-digital converter is connected with the photoelectric detector and is used for converting the voltage signal into a corresponding digital signal and transmitting the digital signal to the computer;
and the computer is used for demodulating to obtain a corresponding temperature value.
Specifically, the heat collecting block and the fins are made of the same material.
The application further provides a method for monitoring the temperature of the fire side of the water-cooled wall of the power station boiler, wherein a plurality of water-cooled tubes are arranged in parallel and are enclosed to form a hearth, and two adjacent water-cooled tubes are connected through fins, and the method comprises the following steps:
s1) selecting a plurality of water cooling pipes of a power station boiler as water cooling pipes to be tested;
s2) arranging a heat collecting block on the wall of the fire side of each water cooling pipe to be tested, and arranging a threading through hole on each heat collecting block, wherein a detection blind hole communicated with the threading through hole on the heat collecting block is further arranged on one heat collecting block, and the opening end of the detection blind hole is arranged on one surface of the heat collecting block, which is contacted with the wall of the corresponding water cooling pipe to be tested;
s3) arranging a temperature measuring optical fiber in a threading through hole on each heat collecting block, detecting the wall temperature of the fire side of each corresponding water cooling pipe to be detected through a temperature measuring grating arranged on the temperature measuring optical fiber and penetrating through the threading through hole of each heat collecting block, converting the detected wall temperature into a first optical signal, and transmitting the first optical signal through the temperature measuring optical fiber;
s4) detecting the tube wall temperature of the fire side of the water cooling tube to be detected, where the corresponding heat collecting block is located, through a temperature sensing probe, converting the detected tube wall temperature into a second optical signal, wherein the temperature sensing probe is connected with the temperature measuring optical fiber, and transmitting the second optical signal through the temperature measuring optical fiber;
s5) obtaining a corresponding temperature value based on the first optical signal and the second optical signal.
According to the monitoring device for the temperature of the fire side of the water-cooled wall of the power station boiler, the temperature measuring optical fiber is arranged according to the high temperature resistance of the optical fiber, one end of the temperature measuring optical fiber enters the hearth and sequentially penetrates through the threading through holes in each heat collecting block, the temperature measuring grating arranged on the temperature measuring optical fiber is used for detecting the temperature of the fire side wall of the water-cooled tube, the heat collecting block is arranged on the selected water-cooled tube to be detected for accurately detecting the temperature of the fire side wall of the water-cooled tube, the temperature measuring grating on the temperature measuring optical fiber is limited at a position close to the water-cooled tube to be detected through the heat collecting block, so that the temperature measuring grating can accurately monitor the temperature of the fire side wall of the water-cooled tube rather than the temperature of a hearth, the temperature measuring probe is arranged in the detection blind hole formed in one heat collecting block for detecting the temperature of the corresponding water-cooled tube, the temperature probe is connected with the temperature measuring optical fiber, the temperature measuring probe is used for converting the temperature of the second optical signal to the temperature of the fire side wall of the water-cooled tube, the temperature measuring grating is converted to the first optical signal to be sent out through the temperature measuring optical fiber, the temperature sensor is used for demodulating the first optical signal, the first optical signal to the temperature of the first optical signal is converted to the temperature of the water-cooled tube, the first optical signal is conveniently converted to the temperature of the water-cooled tube to the water temperature of the water-cooled tube to the fire side, and the water temperature of the water-cooled tube is conveniently obtained by the water-cooled person and the water-cooled signal is conveniently adjusted to the temperature by the operator according to the temperature value. The application also provides a method for monitoring the temperature of the fire side of the water-cooled wall of the power station boiler.
According to the monitoring device and the monitoring method for the temperature of the fire side of the water-cooled wall of the power station boiler, the temperature measuring grating on the high-temperature-resistant temperature measuring optical fiber is limited at the position close to the water-cooled tube to be detected through the heat collecting block, the detected temperature is ensured to be the tube wall temperature of the water-cooled tube to be detected, the problem that thermocouple monitoring equipment is easy to lose efficacy due to overhigh temperature in the power station boiler in the prior art is solved, and a worker can conveniently guide a generator set to carry out parameter adjustment according to the obtained temperature value.
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 monitoring device for the temperature of a fire side of a water wall of a power station boiler;
FIG. 2 is a partial schematic diagram of a monitoring device for the temperature of the fire side of a water wall of a utility boiler;
FIG. 3 is a cross-sectional view of a heat collecting block provided with a threading through hole and a detection blind hole in a device for monitoring the temperature of a fire side of a water-cooled wall of a power station boiler;
fig. 4 is a cross-sectional view of a heat collecting block with threading through holes in a device for monitoring the temperature of a fire side of a water-cooled wall of a utility boiler.
Description of the reference numerals
1-a water-cooled tube; 2-fins; 3-heat collecting block; 4-temperature measuring optical fiber; 5-a temperature sensing probe; 10-hearth; 11-a water cooling pipe to be measured.
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 diagram of an installation structure of a monitoring device for the temperature of a fire side of a water wall of a utility boiler; FIG. 2 is a partial schematic view of a plant boiler water wall fire side temperature monitoring device; FIG. 3 is a cross-sectional view of a heat collecting block with a threading through hole and a detection blind hole in a device for monitoring the temperature of a fire side of a water-cooled wall of a power station boiler; fig. 4 is a cross-sectional view of a heat collecting block with threading through holes in a device for monitoring temperature on fire side of a water-cooled wall of a utility boiler, as shown in fig. 1 to 4, the application provides a device for monitoring temperature on fire side of a water-cooled wall of a utility boiler, which is used for detecting temperature of wall of a plurality of water-cooled tubes 1 on fire side of a furnace 10, wherein the water-cooled tubes 1 are arranged in parallel and are enclosed to form the furnace 10, two adjacent water-cooled tubes 1 are connected by a fin 2, and the device comprises:
the heat collecting blocks 3 are arranged on the fire side pipe walls of the water cooling pipes 11 to be tested, and each heat collecting block 3 is provided with a threading through hole, wherein one heat collecting block 3 is also provided with a detection blind hole communicated with the threading through hole on the heat collecting block 3, and the opening end of the detection blind hole is arranged on one surface of the heat collecting block 3, which is contacted with the pipe wall of the corresponding water cooling pipe 11 to be tested;
the temperature measuring optical fiber 4 is arranged in the threading through hole of each heat collecting block 3 in a penetrating way, wherein a temperature measuring grating is arranged at the part of the temperature measuring optical fiber 4 which is arranged in the threading through hole of each heat collecting block 3 in a penetrating way and is used for detecting the wall temperature of the fire side of each corresponding water cooling pipe 11 to be detected and converting the detected wall temperature into a first optical signal; the temperature measuring optical fiber 4 is used for transmitting the first optical signal;
the temperature sensing probe 5 is arranged in the detection blind hole and is used for detecting the pipe wall temperature of the fire side of the water cooling pipe 11 to be detected, where the corresponding heat collecting block 3 is located, and converting the detected pipe wall temperature into a second optical signal, the temperature sensing probe 5 is connected with the temperature measuring optical fiber 4, and the temperature measuring optical fiber 4 is also used for transmitting the second optical signal;
and the processor is used for receiving the first optical signal and the second optical signal, and filtering, converting and demodulating the first optical signal and the second optical signal to obtain corresponding temperature values.
According to the monitoring device for the temperature of the fire side of the water-cooled wall of the utility boiler, a plurality of water-cooled tubes 1 are selected as water-cooled tubes 11 to be detected, heat collecting blocks 3 are arranged on the wall of each water-cooled tube 11 to be detected on the fire side, and threading through holes are formed in each heat collecting block 3, as shown in fig. 4, the extending direction of the threading through holes formed in each heat collecting block 3 is the same as that of the water-cooled tubes 1, one end of a temperature measuring optical fiber 4 sequentially passes through the threading through holes of each heat collecting block 3 after entering a hearth 10 and is embedded into the threading through holes after penetrating into the threading through holes of the last heat collecting block 3, the temperature measuring optical fiber 4 is quartz optical fiber, a femtosecond laser is adopted at the position, which is positioned in the threading through holes, on the temperature measuring optical fiber 4 to form a temperature measuring grating, the temperature measuring grating is used as a temperature sensor to detect the wall temperature of the corresponding water-cooled tube 11 to be detected, and the temperature measuring optical fiber 4 is wrapped in the corresponding heat collecting block 3 by the threading through holes, so that the temperature measuring optical fiber 4 is fixed in the hearth 10 through the heat collecting block 3; in the application, after the grating is heated, the size of the grating groove can change, so that the wavelength of light corresponding to the light signal transmitted in the optical fiber is different, the corresponding temperature value is obtained after the corresponding light signal is demodulated, but the size change of the grating groove is not only affected by temperature, but also affected by stress, therefore, in the application, in order to further verify the temperature accuracy of the detection of the temperature measuring grating on the temperature measuring optical fiber 4, as shown in figure 3, a detection blind hole communicated with a threading through hole on the heat collecting block 3 is arranged on one of the heat collecting blocks 3, the threading through hole and the detection blind hole are mutually perpendicular arranged in the middle position of the heat collecting block 3, a temperature sensing probe 5 connected with the temperature measuring optical fiber 4 is arranged in the detection blind hole, the temperature sensing probe 5 is an optical fiber black cavity temperature sensing probe which is only used for detecting temperature, the pipe wall temperature of the water-cooled pipe 11 to be detected by the temperature sensing probe 5 corresponds to the pipe wall temperature detected by the temperature sensing grating, so that whether the detection result of the temperature sensing grating is accurate can be obtained, the pipe wall temperature detected by the temperature sensing probe 5 is converted into a second optical signal, the second optical signal is transmitted to the processor through the temperature sensing optical fiber 4, the pipe wall temperature of the water-cooled pipe 11 to be detected by the temperature sensing grating is converted into a first optical signal, the first optical signal and the second optical signal are transmitted to the processor through the temperature sensing optical fiber 4 after being converted into the first optical signal, the processor converts the first optical signal and the second optical signal into corresponding temperature values after filtering, converting and demodulating the first optical signal and the second optical signal, the staff knows the pipe wall temperature of the water-cooled pipe 1 according to the obtained temperature values, meanwhile, if the temperature detected by the temperature sensing probe 5 is the same, the temperature detected by the temperature sensing grating is accurate, otherwise, the temperature detected by the temperature sensing grating is accurate is indicated, the temperature that the temperature probe 5 detects is calibrated to the temperature that the temperature measurement grating detected according to the temperature that makes things convenient for the staff, also makes things convenient for the staff to go out the temperature of water vapor mixture in the water-cooled tube 1 according to the pipe wall temperature of the fire side of water-cooled tube 1 can be better speculation to provide accurate operating parameter for generating set, can be in the high temperature environment characteristic and temperature measurement grating that work for a long time and temperature probe 5 can be accurate detect the pipe wall temperature of water-cooled tube 1 through temperature measurement optic fibre 4, solved the problem that the thermocouple monitoring facilities that causes because of the temperature is too high in the utility boiler among the prior art and become invalid easily.
In one embodiment, the heat collecting block 3 is made of the same material as the fin 2 in order to ensure that the heat collecting block 3 operates normally according to the fin 2 is able to operate normally in a high temperature environment. When the heat collecting block 3 is manufactured, a steel plate which is the same as the fin 2 in material is selected to manufacture the heat collecting block, the steel plate is cut into rectangular plates with the length of 500mm, the width of 6mm and the thickness of 5mm to serve as the heat collecting block 3, and a threading through hole and a detection blind hole are formed in the middle of the heat collecting block 3.
In order to facilitate the temperature measuring optical fiber 4 to enter and exit the hearth 10 to detect the wall temperature of the fire side of the water cooling pipe 1, specifically, an entry and exit hole is formed in one fin 2, and the temperature measuring optical fiber 4 enters the hearth 10 through the entry and exit hole and penetrates through the threading through holes in each heat collecting block 3. One end of the temperature measuring optical fiber 4 enters the hearth 10 from the inlet and outlet holes, passes through the threading through holes on each heat collecting block 3 and is embedded into the last threading through hole penetrated by the temperature measuring optical fiber 4, and temperature detection is carried out through the temperature measuring grating arranged on the temperature measuring optical fiber 4 in the threading through hole, so that the influence of the external environment on the detection result of the temperature measuring grating arranged on the temperature measuring optical fiber 4 is avoided. In order to pass through the temperature measuring optical fiber 4, the setting height of the inlet and outlet holes is higher than the installation height of the heat collecting block 3 corresponding to the first threading through hole which is penetrated in the hearth 10 by the temperature measuring optical fiber 4, so that the bending of the temperature measuring optical fiber 4 is reduced.
The temperature measurement optic fibre 4 is quartz fiber, has high temperature resistant, acid and alkali resistant good characteristic, but impact resistance is extremely poor, flame, flue gas and fly ash environment abominable in furnace 10, consequently in order to better protection temperature measurement optic fibre 4, improves the comprehensive properties of temperature measurement optic fibre 4, monitoring devices still includes: and a part of the temperature measuring optical fiber 4 which is positioned in the hearth and exposed outside the threading through hole is coated with a protective layer. The protective layer is made of a double-layer thermocouple protective tube. The dual-concentric nonmetallic thermocouple protection tube is adopted to wrap the part of the temperature measuring optical fiber 4 exposed at the hearth 10, one layer of protection tube attached to the temperature measuring optical fiber 4 is an alumina tube, and a layer of silicon carbide tube or ceramic protection tube is wrapped outside the alumina tube for double-layer protection, so that the temperature measuring optical fiber 4 has good comprehensive performance, has the functions of resisting cutting flame and thermal shock or preventing mechanical damage, and ensures normal use of temperature measurement.
In order to better fix the temperature measuring optical fiber 4 through the heat collecting blocks 3, each heat collecting block 3 is welded on the wall of the fire side of the corresponding water cooling pipe 11 to be measured. The temperature measuring optical fiber 4 is welded on the corresponding water-cooled tube 11 to be measured in a full-welded mode, the welding angle is 3mm, and the trend of a welding seam between each heat collecting block 3 and the corresponding water-cooled tube 11 to be measured is the same as the extending direction of the corresponding water-cooled tube 11 to be measured during welding. In order to avoid that the welding line is torn due to the heated expansion of air in the gap under the condition that the gap exists between the heat collecting block 3 and the pipe wall of the water-cooled pipe 11 to be tested, the two ends of the heat collecting block 3 perpendicular to the trend of the welding line are not welded, so that the air in the gap can be discharged through the gap between the two ends of the heat collecting block 3 which are not welded and the water-cooled pipe 11 to be tested after being heated under the condition that the gap exists, and the welding line is prevented from being torn.
The temperature of the pipe wall of the water cooling pipe 1 is detected through the temperature measuring grating and the temperature sensing probe 5, the detected temperature values are respectively converted into a first optical signal and a second optical signal, and the first optical signal and the second optical signal are transmitted to the processor through the temperature measuring optical fiber 4, and the processor comprises: the device comprises a photoelectric detector, an analog-to-digital converter, a computer and two optical filter light paths, wherein each optical filter light path is provided with a narrow-band interference optical filter;
each optical filter path filters wavelength light corresponding to the first optical signal and the second optical signal through a set narrow-band interference filter;
the photoelectric detector is connected with the two optical filter light paths and is used for converting wavelength light corresponding to the filtered first optical signal and the filtered second optical signal into corresponding voltage signals;
converting the voltage signal into a corresponding digital signal through the analog-to-digital converter and transmitting the digital signal to a computer;
and the computer is used for demodulating to obtain a corresponding temperature value.
The narrow-band interference filters on the two optical filter optical paths of the processor can respectively select narrow-band interference filters with the central wavelengths of 850nm and 950nm, the narrow-band interference filters with different central wavelengths arranged on the two optical filter optical paths are used for filtering the wavelength light corresponding to the first optical signal and the second optical signal, the filtered wavelength light corresponding to the first optical signal and the second optical signal is transmitted to the photoelectric detector for photoelectric conversion and is converted into corresponding voltage signals, the corresponding voltage signals are amplified and are converted into corresponding digital signals through the analog-to-digital converter, the corresponding digital signals are transmitted to the computer for data colorimetric processing, and finally the temperature is displayed in the Labview virtual instrument interface, so that the corresponding temperature value is obtained. The two narrow-band interference filters with different center wavelengths are arranged, so that the emissivity of the first optical signal and the emissivity of the second optical signal corresponding to the temperature measured by the temperature sensing probe 5 and the temperature measuring grating are approximately equal, and the real temperature irrelevant to the emissivity can be obtained.
Another aspect of the present application provides a method for monitoring a temperature of a fire side of a water wall of a utility boiler, in which a plurality of water-cooled tubes 1 are arranged in parallel and are enclosed to form a furnace 10, and two adjacent water-cooled tubes 1 are connected by a fin 2, the method comprising:
s1) selecting a plurality of water cooling pipes 1 of a power station boiler as water cooling pipes 11 to be tested;
s2) arranging a heat collection block 3 on the wall of each water-cooling pipe 11 to be tested on the fire side, wherein each heat collection block 3 is provided with a threading through hole which is communicated with each other, one heat collection block 3 is also provided with a detection blind hole which is communicated with the threading through hole on the heat collection block 3, and the opening end of the detection blind hole is arranged on one surface of the heat collection block 3 which is contacted with the wall of the corresponding water-cooling pipe 11 to be tested;
s3) arranging a temperature measuring optical fiber 4 to penetrate through a threading through hole on each heat collecting block 3, detecting the wall temperature of each corresponding water cooling pipe 11 to be detected on the fire side through a temperature measuring grating arranged on the temperature measuring optical fiber 4 and penetrating through the threading through hole of each heat collecting block 3, converting the detected wall temperature into a first optical signal, and transmitting the first optical signal through the temperature measuring optical fiber 4;
s4) detecting the wall temperature of the fire side of the water cooling pipe 11 to be detected, where the corresponding heat collecting block 3 is located, through a temperature sensing probe 5 and converting the detected wall temperature into a second optical signal, wherein the temperature sensing probe 5 is connected with the temperature measuring optical fiber 4, and the second optical signal is transmitted through the temperature measuring optical fiber 4;
s5) obtaining a corresponding temperature value based on the first optical signal and the second optical signal.
According to the monitoring device for the temperature of the fire side of the water-cooled wall of the power station boiler, the temperature measuring optical fiber is arranged according to the high temperature resistance of the optical fiber, one end of the temperature measuring optical fiber enters the hearth and sequentially penetrates through the threading through holes in each heat collecting block, the temperature measuring grating arranged on the temperature measuring optical fiber is used for detecting the temperature of the fire side wall of the water-cooled tube, the heat collecting block is arranged on the selected water-cooled tube to be detected for accurately detecting the temperature of the fire side wall of the water-cooled tube, the temperature measuring grating on the temperature measuring optical fiber is limited at a position close to the water-cooled tube to be detected through the heat collecting block, so that the temperature measuring grating can accurately monitor the temperature of the fire side wall of the water-cooled tube rather than the temperature of a hearth, the temperature measuring probe is arranged in the detection blind hole formed in one heat collecting block for detecting the temperature of the corresponding water-cooled tube, the temperature probe is connected with the temperature measuring optical fiber, the temperature measuring probe is used for converting the temperature of the second optical signal to the temperature of the fire side wall of the water-cooled tube, the temperature measuring grating is converted to the first optical signal to be sent out through the temperature measuring optical fiber, the temperature sensor is used for demodulating the first optical signal, the first optical signal to the temperature of the first optical signal is converted to the temperature of the water-cooled tube, the first optical signal is conveniently converted to the temperature of the water-cooled tube to the water temperature of the water-cooled tube to the fire side, and the water temperature of the water-cooled tube is conveniently obtained by the water-cooled person and the water-cooled signal is conveniently adjusted to the temperature by the operator according to the temperature value. The application also provides a method for monitoring the temperature of the fire side of the water-cooled wall of the power station boiler.
According to the monitoring device and the monitoring method for the temperature of the fire side of the water-cooled wall of the power station boiler, the temperature measuring grating on the high-temperature-resistant temperature measuring optical fiber is limited at the position close to the water-cooled tube to be detected through the heat collecting block, the detected temperature is ensured to be the tube wall temperature of the water-cooled tube to be detected, the problem that thermocouple monitoring equipment is easy to lose efficacy due to overhigh temperature in the power station boiler in the prior art is solved, and a worker can conveniently guide a generator set to carry out parameter adjustment according to the obtained temperature value.
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. A power plant boiler water-cooled wall is to monitoring devices of fireside temperature for detect a plurality of water-cooled tube (1) towards the pipe wall temperature of fireside of furnace (10), wherein a plurality of water-cooled tube (1) parallel arrangement just enclose and close each other and form furnace (10), connect through fin (2) between two adjacent water-cooled tube (1), its characterized in that, monitoring devices includes:
the heat collecting blocks (3) are arranged on the fire-oriented side pipe walls of the water cooling pipes (11) to be tested, and each heat collecting block (3) is provided with a threading through hole, wherein one heat collecting block (3) is also provided with a detection blind hole communicated with the threading through hole on the heat collecting block (3), and the opening end of the detection blind hole is arranged on one surface of the heat collecting block (3) contacted with the pipe wall of the corresponding water cooling pipe (11) to be tested;
the temperature measuring optical fiber (4) is arranged in the threading through hole of each heat collecting block (3) in a penetrating way, wherein a temperature measuring grating is arranged at the part of the temperature measuring optical fiber (4) which is arranged in the threading through hole of each heat collecting block (3) in a penetrating way and is used for detecting the wall temperature of each corresponding water cooling pipe (11) to be detected on the fire side and converting the detected wall temperature into a first optical signal; the temperature measuring optical fiber (4) is used for transmitting the first optical signal;
the temperature sensing probe (5) is an optical fiber blackbody cavity temperature sensing probe and is arranged in the detection blind hole and is used for detecting the wall temperature of a fire side of a water cooling pipe (11) to be detected, where the corresponding heat collecting block (3) is located, and converting the detected wall temperature into a second optical signal, the temperature sensing probe (5) is connected with the temperature measuring optical fiber (4), and the temperature measuring optical fiber (4) is also used for transmitting the second optical signal;
and the processor is used for receiving the first optical signal and the second optical signal, filtering, converting and demodulating the first optical signal and the second optical signal to obtain corresponding temperature values, and judging whether the pipe wall temperature detected by the temperature measuring grating of the temperature measuring optical fiber (4) is accurate or not according to the temperature values corresponding to the first optical signal and the second optical signal.
2. The monitoring device for the temperature of the fire side of the water-cooled wall of the utility boiler according to claim 1, wherein an inlet and outlet hole is formed on one fin (2), and the temperature measuring optical fiber (4) enters the hearth (10) through the inlet and outlet hole and passes through the threading through holes on each heat collecting block (3).
3. The monitoring device for the temperature of the fire side of the water-cooled wall of the utility boiler according to claim 2, wherein the setting height of the inlet and outlet holes is higher than the installation height of the heat collecting block (3) where the first threading through hole penetrating the temperature measuring optical fiber (4) is located.
4. The utility boiler water wall fire side temperature monitoring device of claim 2, wherein the monitoring device further comprises: and a part of the temperature measuring optical fiber (4) which is positioned in the hearth (10) and is exposed outside the threading through hole is coated with a protective layer.
5. The utility boiler water wall fire side temperature monitoring device of claim 4 wherein the protective layer is made of double layer thermocouple protective tube.
6. The monitoring device for the temperature of the fire side of the water-cooled wall of a utility boiler according to claim 1, characterized in that each heat collecting block (3) is welded on the wall of the fire side of the corresponding water-cooled tube (11) to be measured.
7. The monitoring device for the temperature of the fire side of the water wall of a utility boiler according to claim 6, wherein the weld trend between each heat collecting block (3) and the corresponding water cooling tube (11) to be measured is the same as the extending direction of the corresponding water cooling tube (11) to be measured.
8. The utility boiler water wall fire side temperature monitoring device of claim 1, wherein the processor comprises: the device comprises a photoelectric detector, an analog-to-digital converter, a computer and two optical filter light paths, wherein each optical filter light path is provided with a narrow-band interference optical filter;
each optical filter path filters wavelength light corresponding to the first optical signal and the second optical signal through a set narrow-band interference filter;
the photoelectric detector is connected with the two optical filter light paths and is used for converting wavelength light corresponding to the filtered first optical signal and the filtered second optical signal into corresponding voltage signals;
the analog-to-digital converter is connected with the photoelectric detector and is used for converting the voltage signal into a corresponding digital signal and transmitting the digital signal to the computer;
and the computer is used for carrying out demodulation processing to obtain a corresponding temperature value.
9. The device for monitoring the temperature of the fire side of the water-cooled wall of the utility boiler according to claim 1, wherein the heat collecting block (3) and the fins (2) are made of the same material.
10. The utility model provides a power plant boiler water-cooling wall is to monitoring method of fireside temperature, a plurality of water-cooling pipes (1) parallel arrangement just enclose and close and form furnace (10), connect through fin (2) between two adjacent water-cooling pipes (1), its characterized in that, the monitoring method includes:
s1) selecting a plurality of water cooling pipes (1) of a power station boiler as water cooling pipes (11) to be tested;
s2) arranging a heat collection block (3) on the wall of each water cooling pipe (11) to be tested on the fire side, wherein each heat collection block (3) is provided with a threading through hole, a detection blind hole communicated with the threading through hole on the heat collection block (3) is also arranged on one heat collection block (3), and the opening end of the detection blind hole is arranged on one surface of the heat collection block (3) contacted with the wall of the corresponding water cooling pipe (11) to be tested;
s3) arranging a temperature measuring optical fiber (4) to penetrate through a threading through hole on each heat collecting block (3), detecting the wall temperature of the fire side of each corresponding water cooling pipe (11) to be detected through a temperature measuring grating arranged on the temperature measuring optical fiber (4) and penetrating through the threading through hole of each heat collecting block (3), converting the detected wall temperature into a first optical signal, and transmitting the first optical signal through the temperature measuring optical fiber (4);
s4) detecting the wall temperature of the fire side of the water-cooled tube (11) to be detected, where the corresponding heat collecting block (3) is located, through a temperature sensing probe (5) and converting the detected wall temperature into a second optical signal, wherein the temperature sensing probe (5) is connected with the temperature measuring optical fiber (4) and transmits the second optical signal through the temperature measuring optical fiber (4);
s5) obtaining a corresponding temperature value based on the first optical signal and the second optical signal.
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| CN116399470A (en) | 2023-07-07 |
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