CN201628617U - Leakage positioning system of pressure-bearing pipe of planar quaternionic array power-station boiler - Google Patents
Leakage positioning system of pressure-bearing pipe of planar quaternionic array power-station boiler Download PDFInfo
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- CN201628617U CN201628617U CN2010201573347U CN201020157334U CN201628617U CN 201628617 U CN201628617 U CN 201628617U CN 2010201573347 U CN2010201573347 U CN 2010201573347U CN 201020157334 U CN201020157334 U CN 201020157334U CN 201628617 U CN201628617 U CN 201628617U
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Abstract
The utility model discloses a four-pipe leakage acoustic-testing accurate positioning system for a power-station boiler, which belongs to field of a boiler pipeline leakage detecting and positioning technology in thermal power generating unit. A leakage accurate-positioning microphone array of a planer quaternionic boiler press-bearing pipe and the arrangement in the furnace cavity are designed according to the structural feature of the power-station boiler, time delay estimation is obtained through maximum likelihood generalized cross correlation to realize determination of accurate position of the boiler pressure-bearing pipe leakage, and the system has high accuracy and stability.
Description
Technical field
The utility model belongs to pressure-bearing pipe of boiler leakage monitoring technical field in the thermal power generation, relates to the Precise Position System of the interior water-cooling wall of boiler, superheater, reheater and the economizer surface pipe leakage of thermal power generation unit specifically.
Background technology
" four pipes " of thermoelectricity boiler leaks is a great problem of puzzlement fired power generating unit safety in production always, carries out boiler booster early prediction, before also not developing into destructive quick-fried leakage, it in time finds to leak, and the position of definite leakage point.Be of great importance for appropriate arrangements blowing out, shortening repair time, minimizing economic loss.
At present, both at home and abroad (referring to patent " Acoustic Leak Detection System ", US4960079, " pressure-bearing pipe of boiler leaks the on-line monitoring instrument ", CN2253829) a large amount of layout of boiler tube leak detecting device employing measuring points cover the modes of boiler heating surfaces, thereby whether the sound pressure level spectrum signature diagnosis leakage big or small and leakage sound that detects leakage sound after filtering the boiler ground unrest takes place.If certain measuring point reports to the police, determine that then it is the center of circle that source of leaks is positioned at this measuring point, 10 meters be in the hemisphere space of radius, so the heating surface that leaks and determine leakage is still judged in the main effect of device, can not navigate to concrete pipe and arrange.For the situation of leaking aperture 1～4mm, the maintenance task often needs to spend great amount of manpower and time, and its great technical barrier that faces is the accurate orientation problem that solves source of leaks.
Summary of the invention
The purpose of this utility model is to provide planar four-element array station boiler leakage of pressure bearing pipe positioning system at the deficiency of " the main effect of boiler tube leak detecting device or the heating surface of judging leakage and determining to leak; can not navigate on the concrete pipe row " in the prior art, it is characterized in that described system comprises microphone, prime amplifier, signal conditioner, DAQ integrated circuit board, simple crosscorrelation estimator and self-adapted genetic algorithm positioning system:
Wherein, first microphone links to each other with the input end of first signal conditioner by first prime amplifier; The output terminal of described first signal conditioner links to each other with the input end of a DAQ integrated circuit board passage; The output terminal of a described DAQ integrated circuit board passage links to each other with the input end of first, second and the 3rd simple crosscorrelation estimator respectively;
Second microphone links to each other with the input end of secondary signal conditioner by second prime amplifier; The output terminal of described secondary signal conditioner links to each other with the input end of the 2nd DAQ integrated circuit board passage; The output terminal of described the 2nd DAQ integrated circuit board passage links to each other with the input end of the first simple crosscorrelation estimator;
The 3rd microphone links to each other with the input end of the 3rd signal conditioner by the 3rd prime amplifier; The output terminal of described the 3rd signal conditioner links to each other with the input end of the 3rd DAQ integrated circuit board passage; The output terminal of described the 3rd DAQ integrated circuit board passage links to each other with the input end of the second simple crosscorrelation estimator;
The 4th microphone links to each other with the input end of the 4th signal conditioner by the 4th prime amplifier; The output terminal of described the 4th signal conditioner links to each other with the input end of the 4th DAQ integrated circuit board passage; The output terminal of described the 4th DAQ integrated circuit board passage links to each other with the input end of the 3rd simple crosscorrelation estimator;
The output terminal of described first, second and the 3rd simple crosscorrelation estimator all links to each other with the self-adapted genetic algorithm positioning system.
Described microphone is positioned at same surface level.
The beneficial effects of the utility model are to break through the thinking that single-point is surveyed separately in the current four main tubes of boiler Leak Detection, consider the coherence messages-microphone is formed the array received leakage signal between each one point sensing device, draw the mistiming that sound arrives the diverse location microphone through cross correlation process to acoustical signal, determine its leak position according to the geometric relationship between target and the primitive position again, have robustness.
Description of drawings
Fig. 1 is a 600MW unit boiler leakage of pressure bearing pipe location four-element array distribution plan;
Fig. 2 is pressure-bearing pipe of boiler leakage positioning system topological figure.
Embodiment
Adopt planar four-element array that power station boiler four-tube leakage is accurately located, the array structure of its microphone and in the distribution of burner hearth as shown in Figure 1 arranges that the measuring point of microphone can suitably be changed according to field condition.Adopt SG-1025/17.5-M723 model boiler to be divided in the present embodiment and be A, B, C, D, E, F, G layer, totally 28 measuring points.
The hardware of positioning system and software topological structure as shown in Figure 2, each microphone all links to each other with signal conditioner by prime amplifier respectively.The signal that signal conditioner generates is input to the cross correlation process device after by the collection of DAQ integrated circuit board, is sent to the software positioning system afterwards again and calculates, thereby confirm the leak position.Microphone and prime amplifier adopt 1/2 inch pre-polarization electret measuring microphone MP201 (sensitivity 50mV/Pa) and ICP prime amplifier MA201.Signal conditioner is provided for the ICCP power supply of sensor, and can carry out filtering and amplification to signal.Regulate shelves and divide three: 1 times, 10 times, 100 times, BNC connector, the 18V DC power supply, the signal after the conditioning is by 68 coaxial needle adapter leads and data acquisition card connection.
System adopts LabVIEW software and NI PXI-6133 capture card, and every channel sample speed reaches as high as 3MS/s.It is f that sample frequency is set
s=102400S/s.
Claims (2)
1. the system of planar four-element array station boiler leakage of pressure bearing pipe location, use microphone to collect leakage signal in the boiler, it is characterized in that described system comprises microphone, prime amplifier, signal conditioner, DAQ integrated circuit board, simple crosscorrelation estimator and self-adapted genetic algorithm positioning system:
Wherein, first microphone links to each other with the input end of first signal conditioner by first prime amplifier; The output terminal of described first signal conditioner links to each other with the input end of a DAQ integrated circuit board passage; The output terminal of a described DAQ integrated circuit board passage links to each other with the input end of first, second and the 3rd simple crosscorrelation estimator respectively;
Second microphone links to each other with the input end of secondary signal conditioner by second prime amplifier; The output terminal of described secondary signal conditioner links to each other with the input end of the 2nd DAQ integrated circuit board passage; The output terminal of described the 2nd DAQ integrated circuit board passage links to each other with the input end of the first simple crosscorrelation estimator;
The 3rd microphone links to each other with the input end of the 3rd signal conditioner by the 3rd prime amplifier; The output terminal of described the 3rd signal conditioner links to each other with the input end of the 3rd DAQ integrated circuit board passage; The output terminal of described the 3rd DAQ integrated circuit board passage links to each other with the input end of the second simple crosscorrelation estimator;
The 4th microphone links to each other with the input end of the 4th signal conditioner by the 4th prime amplifier; The output terminal of described the 4th signal conditioner links to each other with the input end of the 4th DAQ integrated circuit board passage; The output terminal of described the 4th DAQ integrated circuit board passage links to each other with the input end of the 3rd simple crosscorrelation estimator;
The output terminal of described first, second and the 3rd simple crosscorrelation estimator all links to each other with the self-adapted genetic algorithm positioning system.
2. the system as claimed in claim 1 is characterized in that, described microphone is positioned at same surface level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201573347U CN201628617U (en) | 2010-04-09 | 2010-04-09 | Leakage positioning system of pressure-bearing pipe of planar quaternionic array power-station boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201573347U CN201628617U (en) | 2010-04-09 | 2010-04-09 | Leakage positioning system of pressure-bearing pipe of planar quaternionic array power-station boiler |
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| Publication Number | Publication Date |
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| CN201628617U true CN201628617U (en) | 2010-11-10 |
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| CN2010201573347U Expired - Fee Related CN201628617U (en) | 2010-04-09 | 2010-04-09 | Leakage positioning system of pressure-bearing pipe of planar quaternionic array power-station boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535276A (en) * | 2014-12-27 | 2015-04-22 | 东北电力大学 | Monitoring method and system for power station boiler four-tube leakage based on linear array |
| CN107036770A (en) * | 2017-04-18 | 2017-08-11 | 浙江理工大学 | The leakage detection and localization method of air cooler fin tube bank |
-
2010
- 2010-04-09 CN CN2010201573347U patent/CN201628617U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535276A (en) * | 2014-12-27 | 2015-04-22 | 东北电力大学 | Monitoring method and system for power station boiler four-tube leakage based on linear array |
| CN107036770A (en) * | 2017-04-18 | 2017-08-11 | 浙江理工大学 | The leakage detection and localization method of air cooler fin tube bank |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101110 Termination date: 20140409 |