CN105300624A - Online leakage detection device for heat exchange pipe - Google Patents
Online leakage detection device for heat exchange pipe Download PDFInfo
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- CN105300624A CN105300624A CN201510673694.XA CN201510673694A CN105300624A CN 105300624 A CN105300624 A CN 105300624A CN 201510673694 A CN201510673694 A CN 201510673694A CN 105300624 A CN105300624 A CN 105300624A
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- sensor
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- input end
- outlet conduit
- inlet channel
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Abstract
The invention discloses an online leakage detection device for a heat exchange pipe, and relates to a heat exchange pipe. The online leakage detection device is provided with a water inlet pipe sensor, a water outlet pipe sensor, a water inlet pipe, a heat exchange pipe, a water outlet pipe, a wireless transmitting circuit, a wireless receiving circuit and a data center server, and is characterized in that the water inlet pipe sensor is arranged at an inlet of the water inlet pipe, an outlet of the water inlet pipe is connected to an inlet of the heat exchange pipe, the output end of the water inlet pipe sensor is connected to the input end of the wireless transmitting circuit, and the output end of the wireless transmitting circuit transmits water leakage acoustic wave signals of the water inlet pipe and the water outlet pipe to the wireless receiving circuit; the water outlet pipe sensor is arranged at an outlet of the water outlet pipe, an inlet of the water outlet pipe is connected to an outlet of the heat exchange pipe, the output end of the water outlet pipe sensor is connected to the input end of the wireless transmitting circuit, the input end of the wireless receiving circuit receives the water leakage acoustic wave signals, which are transmitted by the wireless transmitting circuit, of the water inlet pipe and the water outlet pipe, and the output end of the wireless receiving circuit is connected to the data center server. The online leakage detection device can detect whether the heat exchange pipe leaks water or not online and determine the position of a leakage point.
Description
Technical field
The present invention relates to heat exchanger tube, especially relate to and can just detect whether leak at the heat exchanger tube initial stage of leaking, and determine and show the online leakage detection apparatus of heat exchanger tube of leakage point position.
Background technology
Heat exchanger tube is the vitals of UTILIZATION OF VESIDUAL HEAT IN low temp. electric fly-ash separator, and be generally arranged in boiler air preheater and be exported in electric precipitator flue or fly-ash separator import loudspeaker place, heat transferring medium is mesolow water, in order to absorption boiler tail flue gas waste heat.Because heat exchanger tube is wrapped in loudspeaker or flue completely, leak if occur, the equipment that not only affects runs, if leak not by Timeliness coverage time more serious, the water leaked flows into electric precipitator, the stifled ash of accumulated ash into lump in electric duster ash bucket, ash bucket, the defeated ash of ash-transmission system will be caused not smooth, and then threaten electric precipitator safe operation.
Some researchs and report is had at present in pipeline leak detection.Whether Chinese patent 204099914U discloses a kind of Intelligent Pipe Leak Detection Instrument, utilize ultrasonic flowmeter to detect domestic water pipeline in conjunction with microprocessor and leak.Chinese patent 203560720U discloses a kind of broadband essential safe type acoustic emission inspection instrument, and whether the vortex vibration produced when utilizing broadband sensor probe gas to leak detects gas container and leak.Whether Chinese patent 103672413A discloses a kind of ultrasonic leak detection method in water supply pipe, utilize ultrasonic transmission/reception transducer to detect in water supply pipe and leak.But above-mentioned existing piping leakage detecting appts ubiquity accuracy of detection not high, cannot locate, particularly cannot carry out the defects such as on-line checkingi in complex environment.
Summary of the invention
The object of the present invention is to provide and can not only whether leak by on-line checkingi heat exchanger tube, and the position of leak source can be determined, improve the online leakage detection apparatus of a kind of heat exchanger tube of accuracy of detection under complex work environment and reliability.
The present invention is provided with inlet channel sensor, outlet conduit sensor, inlet channel, heat exchanger tube, outlet conduit, radio transmitter, wireless receiving circuit, data center server;
Described inlet channel sensor is located at the import of inlet channel, the outlet of inlet channel connects the import of heat exchanger tube, the input end of the output termination radio transmitter of inlet channel sensor, the output terminal of radio transmitter sends the acoustic signals that leaks of inlet channel and outlet conduit to wireless receiving circuit; Outlet conduit sensor is located at the outlet of outlet conduit, the import of outlet conduit connects the outlet of heat exchanger tube, the input end of the output termination radio transmitter of outlet conduit sensor, the input end of wireless receiving circuit receives the inlet channel of radio transmitter output terminal transmission and the acoustic signals that leaks of outlet conduit, the output termination data center server of wireless receiving circuit.
Described radio transmitter is provided with amplifying circuit, filtering circuit, A/D change-over circuit, radiating circuit, the input end of amplifying circuit taps into the output terminal of waterpipe sensor and outlet conduit sensor, the input end of the output termination filtering circuit of amplifying circuit, the input end of the output termination A/D change-over circuit of filtering circuit, the output terminal of A/D change-over circuit connects the input end of radiating circuit.
Described data center server can be provided with warning device, occurs leaking for reminding heat exchanger tube in time.
The technical solution adopted for the present invention to solve the technical problems is: (1) adopts relevant function method in conjunction with highly sensitive sensor, and the position of working environment reasonable Arrangement sensor in conjunction with industrial heat exchange pipe, correlation analysis process is carried out to the acoustic signals that leaks collected, judge two signal correction degree, obtain the mistiming of two signals, to determine leak source.(2) data that each sensor of the present invention collects need, after the process such as radio-frequency (RF) transmitter amplification, filtering, A/D conversion, to adopt serial communication form to send to by launching son end the reception main side be connected with data center server.Data center server receives signal, store, to treat software Treatment Analysis.(3) the present invention can be provided with warning device, and staff's heat exchanger tube can be reminded in time to occur leaking.(4) the present invention adopts visual leak source to design, and can realize the position of online observation leak source on computer interface, reduce the maintenance workload of staff.
The invention has the beneficial effects as follows, the not blowing out (online) that can realize heat exchanger tube detects, and accuracy of detection is high, can locate the position of leak source.Whether in addition, a whole set of detection system adopts wireless signal transmission techniques, provides the functions such as automatic alarm, substantially increases the reliability of testing process, can leak by very first time feedback heat exchanger tube, reduce maintenance cost, improve industrial efficiency.
Accompanying drawing explanation
Fig. 1 is the structure composition schematic diagram of the embodiment of the present invention.
Fig. 2 is the layout of the sensor of the embodiment of the present invention.
Fig. 3 is the simplification heat exchange pipeline correlation method positioning principle figure of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
See Fig. 1 ~ 3, the embodiment of the present invention is provided with inlet channel sensor 11, outlet conduit sensor 12, inlet channel 2, heat exchanger tube 3, outlet conduit 4, radio transmitter 51, wireless receiving circuit 52, data center server 6.
Described inlet channel sensor 11 is located at the import of inlet channel 2, the outlet of inlet channel 2 connects the import of heat exchanger tube 3, the input end of the output termination radio transmitter 51 of inlet channel sensor 11, the output terminal of radio transmitter 51 sends the acoustic signals that leaks of inlet channel and outlet conduit to wireless receiving circuit 52; Outlet conduit sensor 12 is located at the outlet of outlet conduit 4, the import of outlet conduit 4 connects the outlet of heat exchanger tube 3, the input end of the output termination radio transmitter 51 of outlet conduit sensor 12, the input end of wireless receiving circuit 52 receives the inlet channel of radio transmitter 51 output terminal transmission and the acoustic signals that leaks of outlet conduit, the output termination data center server 6 of wireless receiving circuit 52.
Described radio transmitter 51 is provided with amplifying circuit, filtering circuit, A/D change-over circuit, radiating circuit, the input end of amplifying circuit taps into the output terminal of waterpipe sensor 11 and outlet conduit sensor 12, the input end of the output termination filtering circuit of amplifying circuit, the input end of the output termination A/D change-over circuit of filtering circuit, the output terminal of A/D change-over circuit connects the input end of radiating circuit.
Described data center server 6 can be provided with warning device, occurs leaking for reminding heat exchanger tube in time.
In FIG, marking P is the flue of electric precipitator.
Sensing range of the present invention is mainly atomised to the continuous thread of formation from oozing out little water droplet, in order to pole early finds that heat exchange pipeline leaks and meets the requirement of precision of detecting leak gas, leak detection system must can realize drop leak detection, but will reach this requirement, just needs to adopt high sensor.
Wireless transmit of the present invention, receiving trap adopt " one-to-many " wireless radio frequency mode transmission of signal, relative to wire transmission, have cost low, be convenient to the advantages such as maintenance.
Data center server of the present invention receives signal, stores, and has the ability of stronger signal analysis and processing.
Sensor is arranged in import and export pipeline place, can realizes heat exchanger tube and hunt leak online, heat-exchanger rig is formed by multiple independently unit assembly, with certain unit for measuring object, respectively lays a sensor in the middle part of its import and export pipeline.Each sensor is transferred on the wireless launcher outside heat exchanger tube after the acoustic signals collected is converted into electric signal, after the process such as radio-frequency (RF) transmitter amplification, filtering, A/D conversion, serial communication form is adopted to send to by launching son end the reception main side be connected with data center server.Data center server receives signal, store, to treat software Treatment Analysis.If there is leak source, two sensors on same unit module, with the acoustic signals collected by sensor at first for input signal x (t), the signal that the sensor in conjunction with corresponding combination collects is as another input signal y (t) of correlation analysis.If occur, sensor receives water leakage x (t) simultaneously, then according to the sensor priority of Operation system setting as input signal x (t) of correlation analysis and input signal y (t) in conjunction with another correspondence carries out correlation analysis.
The present invention's application correlation analysis ultimate principle, the signal that inlet channel sensor and outlet conduit sensor receive is respectively x (t) and y (t).Two signals compare by relevant treatment exactly, differentiate mutual degree of correlation, obtain the mistiming of two signals simultaneously.Sensor gathers acoustic signals in two kinds of situation, and one is heat exchanger tube work but does not produce leakage, and single-sensor gathers heat exchanger tube base signal, after the process such as amplification, filtering, carries out showing and arranging preservation with oscillogram.Another kind is that sensor detects when leaking acoustic signals, through above-mentioned process equally, obtains pairwise correlation sensor and to leak acoustic signals figure.Meanwhile, the algorithm of correlation analysis stores and cross-correlation analysis signal, and exports the oscillogram after cross-correlation analysis, calculates time delays amount according to the Wave data in oscillogram, finally realizes the location of leak position.
The ultimate principle of below exchanging heat pipe leakage location is described: the sensor being arranged in heat exchanger tube two ends receives the acoustic signals that leaks, if leakage point is in the centre of pipeline, water leakage arrives sensor simultaneously; If leakage point is not in centre, the mistiming T of Acoustic Wave Propagation to sensor that leak produced by two leak sources can be measured
das long as the physical length L of heat exchange pipeline and sound wave are at the velocity of propagation v of this pipeline, the position L of leakage point between given two sensors
xjust can be calculated as follows out, the v in formula depends on tubing, caliber and ducted medium.Known 2 sensors, along the distance L between heat exchange pipeline, draw the mistiming T of leak source signal to 2 sensors by correlation method analysis
d, known sound wave speed v in the duct, determines the position (namely leak source is to the duct length of inlet channel sensor) of leak source: L
x=(L-T
d× v)/2.
But above algorithm can only locate the leakage point of the pipeline of single straight line, roughly to locate the position of heat exchange pipeline, the feature that periodically must bend in conjunction with heat exchanger tube, determine the position of leakage point in heat exchange pipeline, known overall length is L, and acoustic velocity is v, and it is T that two sensors receives the water leakage mistiming
m, bending every segment length is L
0if, L
yfor leak source is apart from the distance of nearest sensor, n is row (n the is integer) L=n × L of heat exchanger tube
0, then L-2L is had
y=T
m× v, wherein n × L
0≤ L
y≤ (n+1) L
0, simultaneous above formula obtains n round numbers.
Claims (3)
1. the online leakage detection apparatus of heat exchanger tube, is characterized in that being provided with inlet channel sensor, outlet conduit sensor, inlet channel, heat exchanger tube, outlet conduit, radio transmitter, wireless receiving circuit, data center server;
Described inlet channel sensor is located at the import of inlet channel, the outlet of inlet channel connects the import of heat exchanger tube, the input end of the output termination radio transmitter of inlet channel sensor, the output terminal of radio transmitter sends the acoustic signals that leaks of inlet channel and outlet conduit to wireless receiving circuit; Outlet conduit sensor is located at the outlet of outlet conduit, the import of outlet conduit connects the outlet of heat exchanger tube, the input end of the output termination radio transmitter of outlet conduit sensor, the input end of wireless receiving circuit receives the inlet channel of radio transmitter output terminal transmission and the acoustic signals that leaks of outlet conduit, the output termination data center server of wireless receiving circuit.
2. the online leakage detection apparatus of heat exchanger tube as claimed in claim 1, it is characterized in that described radio transmitter is provided with amplifying circuit, filtering circuit, A/D change-over circuit, radiating circuit, the input end of amplifying circuit taps into the output terminal of waterpipe sensor and outlet conduit sensor, the input end of the output termination filtering circuit of amplifying circuit, the input end of the output termination A/D change-over circuit of filtering circuit, the output terminal of A/D change-over circuit connects the input end of radiating circuit.
3. the online leakage detection apparatus of heat exchanger tube as claimed in claim 1, is characterized in that described data center server is provided with warning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510673694.XA CN105300624A (en) | 2015-10-16 | 2015-10-16 | Online leakage detection device for heat exchange pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510673694.XA CN105300624A (en) | 2015-10-16 | 2015-10-16 | Online leakage detection device for heat exchange pipe |
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| CN105300624A true CN105300624A (en) | 2016-02-03 |
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| CN201510673694.XA Pending CN105300624A (en) | 2015-10-16 | 2015-10-16 | Online leakage detection device for heat exchange pipe |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2181688Y (en) * | 1994-02-07 | 1994-11-02 | 陆厚平 | Pipe leakage auto-alarm device |
| CN2750303Y (en) * | 2004-10-15 | 2006-01-04 | 刘福启 | Automatic detector for water and air leakage of underground pipe |
| JP2006003311A (en) * | 2004-06-21 | 2006-01-05 | Mitsubishi Electric Corp | Abnormality part detecting device |
| CN1755342A (en) * | 2004-09-28 | 2006-04-05 | 北京埃德尔黛威新技术有限公司 | Method and apparatus for detecting leakage of liquid pressure pipeline |
| US20090000381A1 (en) * | 2007-06-26 | 2009-01-01 | General Electric Company | Acoustic impact detection and monitoring system |
| CN101551064A (en) * | 2009-05-22 | 2009-10-07 | 重庆大学 | Water supply pipe leakage detection locating signal processing method |
-
2015
- 2015-10-16 CN CN201510673694.XA patent/CN105300624A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2181688Y (en) * | 1994-02-07 | 1994-11-02 | 陆厚平 | Pipe leakage auto-alarm device |
| JP2006003311A (en) * | 2004-06-21 | 2006-01-05 | Mitsubishi Electric Corp | Abnormality part detecting device |
| CN1755342A (en) * | 2004-09-28 | 2006-04-05 | 北京埃德尔黛威新技术有限公司 | Method and apparatus for detecting leakage of liquid pressure pipeline |
| CN2750303Y (en) * | 2004-10-15 | 2006-01-04 | 刘福启 | Automatic detector for water and air leakage of underground pipe |
| US20090000381A1 (en) * | 2007-06-26 | 2009-01-01 | General Electric Company | Acoustic impact detection and monitoring system |
| CN101551064A (en) * | 2009-05-22 | 2009-10-07 | 重庆大学 | Water supply pipe leakage detection locating signal processing method |
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Application publication date: 20160203 |
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