CN103206616A - Power plant pipe network leakage positioning and detecting system and detection method - Google Patents
Power plant pipe network leakage positioning and detecting system and detection method Download PDFInfo
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- CN103206616A CN103206616A CN2013100912900A CN201310091290A CN103206616A CN 103206616 A CN103206616 A CN 103206616A CN 2013100912900 A CN2013100912900 A CN 2013100912900A CN 201310091290 A CN201310091290 A CN 201310091290A CN 103206616 A CN103206616 A CN 103206616A
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Abstract
The invention relates to the technical field of pipe network leakage detection in thermal power generation and discloses a power plant pipe network leakage positioning and detecting system which comprises a frequency spectrum detection module, a DSP (digital signal processor) and a sound source positioning module. The frequency spectrum detection module comprises a piezoelectric ceramic sensor, the sound source positioning module comprises a temperature sensor and a piezoelectric ceramic sensor array, the DSP is electrically connected with the piezoelectric ceramic sensor and the sound source positioning module respectively and control the frequency spectrum detection module to monitor sound of a pipe network through the piezoelectric ceramic sensor, and when the sound of the pipe network is abnormal, the sound source positioning module determines leakage points of the pipe network through the temperature sensor and the piezoelectric ceramic sensor array. The invention further discloses a related detection method. The power plant pipe network leakage positioning and detecting system and the detection method are high in detection precision and applicable to wide leakage detection range.
Description
Technical field
The present invention relates to pipeline network leak detection technique field in the thermal power generation, particularly a kind of power station pipeline network leak position detecting system and detecting method.
Background technique
The thermoelectricity power station is to adopt the high pressure steam pushing turbine to generate electricity.(general pressure can reach 15Mpa to the high pressure steam that produces from coal fired boiler, temperature can reach 550 ℃) be transported to steam turbine through pipe network, will be by a series of pipe network equipments such as straight tube, bend pipe, reducer pipe, threeway, flange, valves at this process mesohigh steam.And in a single day leak the joint of these equipment, will seriously jeopardize normal power generation and production safety.If stop production to overhaul will bring more large economy loss.
Known leakage detection method has multiple at present, such as Chinese patent " boiler pressure-bearing pipe leakage positioning method for planar four-element array power station " (patent No.: 201010144762.0), this disclosure of the Invention belong to a kind of power station boiler four-pipe leakage sounding Precise Position System of the boiler tubing leak detection field of locating technology of thermal power generation unit.Design the planar four-element pressure-bearing pipe of boiler according to the structural feature of station boiler and leaked accurately location microphone array and the layout in burner hearth thereof, obtaining time lag by maximum likelihood broad sense crosscorrelation estimates, and adopt decimal system floating-point code adaptive Gauss variation algorithm to realize that the exact position of pressure-bearing pipe of boiler leakage is definite, have highi degree of accuracy and robustness.Its deficiency is: with strong points causing a little less than the applicability, only be applicable to four-tube leakage.
Summary of the invention
The objective of the invention is in order to solve the problems of the technologies described above, a kind of power station pipeline network leak position detecting system and detecting method are provided, in the hope of by these apparatus and method, utilize the acoustic-electric transfer principle, and be foundation with the frequency analysis, detect the position of pipeline network leak accurately and fast.
The technological scheme that the present invention takes is:
A kind of power station pipeline network leak position detecting system, comprise power plant's webmaster, the frequency spectrum detection module, DSP, the auditory localization module, it is characterized in that, described frequency spectrum detection module comprises a piezoceramic transducer, described piezoceramic transducer is installed on the described pipe network, described auditory localization module comprises a temperature transducer and piezoceramic transducer array, described piezoceramic transducer array distribution is arranged on the diverse location of described pipe network, described DSP respectively with described piezoceramic transducer, the auditory localization module is electrical connected, described DSP controls described frequency spectrum detection module and by described piezoceramic transducer pipe network sound is monitored, when pipe network sound is led often, described auditory localization module is determined the pipe network leak point by described temperature transducer and described piezoceramic transducer array.
Further, described detection system also comprises an alarm module, and described alarm module comprises a buzzer and a digital display tube, when described piezoceramic transducer monitors the net cacophonia, described buzzer warning, described digital display tube shows the projection drawing of described pipe network leak point.
Further, described buzzer is piezo buzzer.
Further, described DSP comprises a timer, and described DSP regularly sends control signal to described frequency spectrum detection module according to the timing time of timer, controls described piezoceramic transducer and detects the sound signal that pipe network sends.
Further, described piezoceramic transducer array comprises at least 3 piezoceramic transducers.
Further, described piezoceramic transducer array adopts the equilateral triangle structure.
Further, the piezoceramic transducer in the described frequency spectrum detection module and the piezoceramic transducer in the described piezoceramic transducer array all adopt the waterproof type ultrasonic wave sensor.
A kind of detecting method of using power station pipeline network leak position detecting system is characterized in that, comprises the steps:
The first step: described DSP sends control signal to described frequency spectrum detection module, controls described piezoceramic transducer and detects the sound signal that described pipe network sends;
Second step: described piezoceramic transducer detects the sound signal that described pipe network sends and described sound signal is converted into electrical signal and sends described DSP to;
The 3rd step: described DSP carries out frequency analysis to the electrical signal that described piezoceramic transducer transmits, and the amplitude variable of more described electrical signal and basic amplitude variable return the first step if both are identical, if both are not simultaneously then entered for the 4th step;
The 4th step: described DSP controls described alarm module and reports to the police;
The 5th step: described DSP controls the current ambient temperature of temperature transducer record of described auditory localization module, and calculates the velocity of sound of pipe network sound signal;
The 6th step: described DSP records the time that sound signal that described pipe network sends arrives each piezoceramic transducer in the piezoceramic transducer array, calculates the time difference;
The 7th step: described DSP calculates the plane projection position of described pipe network leak point;
The 8th step: described DSP is sent to the plane projection position of described pipe network leak point in the digital display tube of alarm module and shows.
Further, in the described first step, the frequency that described DSP sends control signal to described frequency spectrum detection module be every clock once.
Further, the quantity of the piezoceramic transducer in the described piezoceramic transducer array is 3, is the equilateral triangle shape and arranges.
The invention has the beneficial effects as follows:
(1) scope of testing precision height, suitable detection leakage is wide;
(2) device structure is simple, and is cheap;
(3) simple to operate, detect with the location and all finish by DSP, low for operator's technical requirements.
Description of drawings
Accompanying drawing 1 is structural representation of the present invention;
The workflow schematic representation that accompanying drawing 2 is to use the present invention to detect;
Accompanying drawing 3 is piezoceramic transducer arranged in arrays schematic representation;
Accompanying drawing 4 is flow charts of power station of the present invention pipeline network leak position finding and detection method.
Label among the figure is represented respectively:
11. frequency spectrum detection module; 111. piezoceramic transducer;
12.DSP; 13. auditory localization module;
131. temperature transducer; 132. piezoceramic transducer array;
14. alarm module; 141. buzzer;
142. nixie tube.
Embodiment
Elaborate below in conjunction with the embodiment of accompanying drawing to power station of the present invention pipeline network leak position detecting system.
Referring to accompanying drawing 1, power station pipeline network leak position detecting system comprises frequency spectrum detection module 11, DSP12, auditory localization module 13 and alarm module 14.
Frequency spectrum detection module 11 comprises a piezoceramic transducer 111, and piezoceramic transducer 111 is electrical connected with DSP12, and the sound signal that sends for detection of pipe network also is converted into electrical signal with sound signal and sends DSP12 to.Piezoceramic transducer 111 comprises 40A25TR-1 waterproof type ultrasonic wave sensor.Make the electrical signal of transmission for regulating, so the user adjusts accordingly when setting the reference amplitude variable according to actual measurement environment (for example, the steam pressure difference that the boiler of different capacity produces, its frequency spectrum is also different).
At first the piezoceramic transducer 111 to frequency spectrum detection module 11 carries out initialization.Pipe network can send number voice when normally using in certain workplace, after piezoceramic transducer 111 detects the sound signal that obtains under the normal state, it is converted into corresponding electrical signal and is delivered to DSP12 by lead with the normal sound signal, carry out frequency analysis by DSP12, obtain the reference amplitude variable, piezoceramic transducer 111 electrical signal that is sent to DSP12 contrasts with the reference amplitude variable after frequency analysis afterwards, and handles accordingly according to comparative result.Because any one electrical signal can utilize Fourier transformation to convert the N subharmonic to, get first three harmonic wave and its conversion is synthesized frequency-region signal, obtain the amplitude variable of the electrical signal that detects, recorded this electrical signal exactly so record the coefficient of these three harmonic waves; Get four harmonic waves if the raising precision can increase to, only need correspondingly change the model of DSP to improve the performance of DSP.
DSP12 is electrical connected with piezoceramic transducer 111, auditory localization module 13 and alarm module 14 respectively.DSP12 adopts TMS320F2812, and this DSP has low power consumption, low voltage and the instruction system function is strong, efficient is high, the advantage of fast operation.DSP12 sends control signal to frequency spectrum detection module 11, and control piezoceramic transducer 111 detects the sound signal that pipe network sends.DSP12 comprises a timer, set the timer per minute and send control signal to frequency spectrum detection module 11, control piezoceramic transducer 111 detects the sound signal that pipe network sends, and piezoceramic transducer 111 is sent to detected sound signal among the DSP12 through becoming electrical signal after transforming.
DSP12 carries out Fourier transformation with the electrical signal that receives and converts third harmonic to, and its conversion is synthesized frequency-region signal.The amplitude variable of the frequency-region signal of DSP12 contrasts with corresponding spectrum signal (reference amplitude variable) under originally recording the pipe network normal operation, if identically then continue this circulation (namely continuing control piezoceramic transducer 111 detects); If inequality, DSP12 sends trigger signal, triggers alarm module 14; Send enable signal simultaneously, make auditory localization module 13 in running order.
Referring to Fig. 2, the leakage position finding and detection method that carries out the power station pipe network by the present invention is: at first, the piezoceramic transducer 111(of initialization frequency spectrum detection module 11 is piezoceramic transducer 4 as shown in FIG., hereinafter to be referred as piezoceramic transducer 4) and piezoceramic transducer array 132 in all piezoceramic transducers (be example with 3 piezoceramic transducers, piezoceramic transducer 1, piezoceramic transducer 2 and piezoceramic transducer 3 as shown in Figure 3), obtain the signal initial value of corresponding piezoceramic transducer.
The timer per minute of DSP12 sends control signal to piezoceramic transducer 4, controls it and detects the sound signal that pipe network sends, and is sent among the DSP12 through becoming electrical signal after transforming.DSP12 carries out Fourier transformation with the electrical signal that receives and converts third harmonic to, and its conversion is synthesized frequency-region signal.The amplitude variable of the frequency-region signal of DSP12, do contrast (working value that is about to piezoceramic transducer 4 is done contrast with the signal initial value of piezoceramic transducer 4) with the reference amplitude variable that originally recorded under the pipe network normal operation, if identically then continue this circulation (i.e. continuation is controlled the sound signal that 4 pairs of pipe networks of piezoceramic transducer send and detected); If inequality, DSP12 sends trigger signal, and the piezo buzzer that triggers alarm module 14 sends the buzzing chimes of doom; Send enable signal simultaneously, make auditory localization module 13 in running order.
The temperature transducer 131 of auditory localization module 13 is noted the ambient temperature when the amplitude variable of detected electrical signal and reference amplitude variable are inequality, and DSP12 adopts look-up table to draw the velocity of sound; Simultaneously, piezoceramic transducer 1,2,3 records improper sound signal respectively and arrives the time of self, and the value of the improper signal that piezoceramic transducer 1,2,3 obtains draws leakage point with separately signal initial value contrast with this moment.
Referring to accompanying drawing 3, three-dimensional leakage point is projected on the two dimensional surface, calculate leakage point with two-dimentional algorithm then, what draw is a planar coordinate, leakage point is just on the vertical line at this place.
Be example with 3 piezoceramic transducers, piezoceramic transducer 1, piezoceramic transducer 2 and piezoceramic transducer 3 as shown in FIG., suppose that piezoceramic transducer 1 position is that A point (being true origin), piezoceramic transducer 2 positions are that B point and piezoceramic transducer 3 positions are the C point, 3 piezoceramic transducers are arranged to isosceles right triangle pattern (being AC=AB), the S point is the three-dimensional projection of leakage point on two dimensional surface, and the angle of S point and coordinate axes x is θ.
Can get relation according to the triangle cosine law:
SC
2=SA
2+AC
2-2·SA·AC·COS(90-θ) （1）
SB
2=SA
2+AB
2-2·SA·AB·COSθ （2）
Suppose that the velocity of sound in the current environment that obtains by temperature transducer 131 is ν, and the delay inequality of the sound signal that sends of the pipe network that receives of piezoceramic transducer 1 and piezoceramic transducer 2 is τ
AB, the delay inequality of the sound signal that the pipe network that piezoceramic transducer 1 and piezoceramic transducer 3 receive sends is τ
AC, then the pass of SA, SB, SC is:
SC=SA+ν·τ
AC （3）
SB=SA+ν·τ
AB （4）
The direction angle of leakage point S is:
In conjunction with formula (1), (2), (3), (4), utilize universal formula then, list d respectively, e, f(d, e, f are respectively the coefficients of quadratic equation with one unknown), calculate SA then, recycling formula (5), (6) draw the x that S is ordered, the y value.Concrete formula is as follows: wherein the Longtriangle representative is long, and the Trianglewidth representative is wide.
d=4*pow((Longtriangle)*(Trianglewidth),2)-4*pow(v*Longtriangle*(timeC-timeA),2)-4*pow(Trianglewidth*v*(timeB-timeA),2);
e=-4*(pow(Longtriangle,2)*pow(v*(timeC-timeA),3)-pow(Longtriangl e*Trianglewidth,2)*v*(timeC-timeA)+pow(Trianglewidth,2)*pow(v*(timeB-timeA),3)-pow(Longtriangle*Trianglewidth,2)*v*(timeB-timeA));
f=-(pow(Longtriangle,2)*pow(v*(timeC-timeA),4)-2*pow(Longtriangl e*Trianglewidth*v,2)*(pow((timeC-timeA),2)+pow((timeB-timeA),2))+pow (Longtriangle,2)*pow(Trianglewidth,4)+pow(Longtriangle,4)*pow(Triang lewidth,2)+pow(Trianglewidth,2)*pow(v*(timeB-timeA),4));
sa=(e-pow((e*e-4*d*f),0.5))/(-2*d);
x=(sa*sa+Longtriangle*Longtriangle-(sa+v*(timeB-timeA))*(sa+v*(t imeB-timeA)))/(Longtriangle*2);
y=(sa*sa+Trianglewidth*Trianglewidth-(sa+v*(timeC-timeA))*(sa+v*(timeC-timeA)))/(Trianglewidth*2);
By the x of nixie tube Alternation Display leakage point planar coordinate, the y coordinate figure, hence one can see that leakage point is at S(x, y) on the vertical line at place.
Referring to accompanying drawing 4, the step of power station pipeline network leak position finding and detection method is as follows:
The first step: DSP12 sends control signal to frequency spectrum detection module 11, and control piezoceramic transducer 111 detects the sound signal (step S1 among the figure) that pipe network sends.
Second step: piezoceramic transducer 111 detects the sound signal that pipe networks send and sound signal is converted into electrical signal and sends step S2 among the DSP12(figure to);
The 3rd step: the electrical signal that the piezoceramic transducer 111 of DSP12 transmits carries out frequency analysis, and relatively the amplitude variable of electrical signal and basic amplitude variable return the first step if both are identical, if both are not simultaneously then entered for the 4th step (step S3 among the figure);
The 4th step: DSP12 control alarm module 14 warnings (step S4 among the figure);
The 5th step: the temperature transducer 131 of DSP12 control sound source locating module 13 records current ambient temperature, and calculates the velocity of sound (step S5 among the figure) of pipe network sound signal;
The 6th step: the sound signal that DSP12 record pipe network sends arrives the time of each piezoceramic transducer in the piezoceramic transducer array 132, calculates the time difference (step S6 among the figure);
The 7th step: DSP12 calculates the plane projection position (step S7 among the figure) of pipe network leak point;
The 8th step: DSP12 is sent to the plane projection position of pipe network leak point in the digital display tube 142 of alarm module 14 and shows (step S8 among the figure).
The user can be both accurate by the present invention, records the leakage point of pipe network again rapidly, the testing precision height, and it is wide to be suitable for the scope that detects leakage; Simple to operate, detect with the location and all finish by DSP, low for operator's technical requirements; Device structure is simple, and is cheap.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. power station pipeline network leak position detecting system, comprise power plant's webmaster, the frequency spectrum detection module, DSP, the auditory localization module, it is characterized in that: described frequency spectrum detection module comprises a piezoceramic transducer, described piezoceramic transducer is installed on the described pipe network, described auditory localization module comprises a temperature transducer and piezoceramic transducer array, described piezoceramic transducer array distribution is arranged on the diverse location of described pipe network, described DSP respectively with described piezoceramic transducer, the auditory localization module is electrical connected, described DSP controls described frequency spectrum detection module and by described piezoceramic transducer pipe network sound is monitored, when pipe network sound is led often, described auditory localization module is determined the pipe network leak point by described temperature transducer and described piezoceramic transducer array.
2. power station according to claim 1 pipeline network leak position detecting system, it is characterized in that: described detection system also comprises an alarm module, described alarm module comprises a buzzer and a digital display tube, when described piezoceramic transducer monitors the net cacophonia, described buzzer warning, described digital display tube shows the projection drawing of described pipe network leak point.
3. power station according to claim 2 pipeline network leak position detecting system, it is characterized in that: described buzzer is piezo buzzer.
4. power station according to claim 1 pipeline network leak position detecting system, it is characterized in that: described DSP comprises a timer, described DSP regularly sends control signal to described frequency spectrum detection module according to the timing time of timer, controls described piezoceramic transducer and detects the sound signal that pipe network sends.
5. power station according to claim 1 pipeline network leak position detecting system, it is characterized in that: described piezoceramic transducer array comprises at least 3 piezoceramic transducers.
6. power station according to claim 5 pipeline network leak position detecting system, it is characterized in that: described piezoceramic transducer array adopts the equilateral triangle structure.
7. according to each described power station pipeline network leak position detecting system in the claim 1 to 6, it is characterized in that: the piezoceramic transducer in the piezoceramic transducer in the described frequency spectrum detection module and the described piezoceramic transducer array all adopts the waterproof type ultrasonic wave sensor.
8. a detecting method of using power station as claimed in claim 2 pipeline network leak position detecting system is characterized in that, comprises the steps:
The first step: described DSP sends control signal to described frequency spectrum detection module, controls described piezoceramic transducer and detects the sound signal that described pipe network sends;
Second step: described piezoceramic transducer detects the sound signal that described pipe network sends and described sound signal is converted into electrical signal and sends described DSP to;
The 3rd step: described DSP carries out frequency analysis to the electrical signal that described piezoceramic transducer transmits, and the amplitude variable of more described electrical signal and basic amplitude variable return the first step if both are identical, if both are not simultaneously then entered for the 4th step;
The 4th step: described DSP controls described alarm module and reports to the police;
The 5th step: described DSP controls the current ambient temperature of temperature transducer record of described auditory localization module, and calculates the velocity of sound of pipe network sound signal;
The 6th step: described DSP records the time that sound signal that described pipe network sends arrives each piezoceramic transducer in the piezoceramic transducer array, calculates the time difference;
The 7th step: described DSP calculates the plane projection position of described pipe network leak point;
The 8th step: described DSP is sent to the plane projection position of described pipe network leak point in the digital display tube of alarm module and shows.
9. power station according to claim 8 pipeline network leak position finding and detection method is characterized in that: in the described first step, the frequency that described DSP sends control signal to described frequency spectrum detection module be every clock once.
10. power station according to claim 8 pipeline network leak position finding and detection method, it is characterized in that: the quantity of the piezoceramic transducer in the described piezoceramic transducer array is 3, is the equilateral triangle shape and arranges.
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| 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 |
| CN105782729A (en) * | 2016-05-10 | 2016-07-20 | 肖香福 | Automatic leak detection device for fuel gas pipeline |
| CN105972442A (en) * | 2016-05-10 | 2016-09-28 | 肖香福 | Detector for gas pipeline |
| CN107990154A (en) * | 2017-11-30 | 2018-05-04 | 南京航空航天大学 | A kind of micro piezoelectric robot and environment perception method for perceiving environmental change |
| CN108386728A (en) * | 2018-02-01 | 2018-08-10 | 常州常工电子科技股份有限公司 | Pipeline leakage detection method and system |
| CN116557797A (en) * | 2023-07-12 | 2023-08-08 | 上海电机学院 | Nondestructive testing positioning method and system for leakage of long-distance ultralow-pressure large-diameter pipeline |
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| CN116557797A (en) * | 2023-07-12 | 2023-08-08 | 上海电机学院 | Nondestructive testing positioning method and system for leakage of long-distance ultralow-pressure large-diameter pipeline |
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Application publication date: 20130717 |