CN107870046A - A kind of boiler sound wave thermometric system and method - Google Patents
A kind of boiler sound wave thermometric system and method Download PDFInfo
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- CN107870046A CN107870046A CN201610852212.1A CN201610852212A CN107870046A CN 107870046 A CN107870046 A CN 107870046A CN 201610852212 A CN201610852212 A CN 201610852212A CN 107870046 A CN107870046 A CN 107870046A
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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
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
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Abstract
The invention discloses it is a kind of accurately test boiler in temperature boiler sound wave thermometric system and method, sound wave temp measuring system, including：Industrial computer, power amplifier, pinger and acoustic receiver, set data collecting card, signal that card and processor occurs in industrial computer, mainly using PCI slot insert connect, pinger is arranged at furnace wall flame-observing hole, acoustic receiver receive be arranged in another several times stove it is strong on.The present invention can select optimal sound wave temperature measurement signal, reduce interference of the ambient noise frequency range to sound wave temperature measurement signal, and then more accurate measurement goes out sound wave temperature measurement signal and flown over the time, so as to obtain the temperature accurately in test boiler.
Description
Technical field
The invention belongs to acoustic thermometry field, more particularly to a kind of boiler sound wave thermometric system and method.
Background technology
In the coal-burning boiler of large-size thermal power plant, the distribution in temperature field be to determine equipment state important parameter it
One, therefore the distribution in furnace flame temperature field has great importance for boiler implosion and combustion diagnosis, it is directly influenced
The economy and security of the catching fire of coal dust, after-flame and boiler, while have influence on the discharge capacity of pollutant.
The distribution of temperature field in furnace can reflect burning running situation in stove, and reliable basis are provided for the operation of operations staff,
And provide in-furnace temperature signal for the automation equipment of thermal control process.If the distribution of energy accurate reproduction temperature field in furnace, so that it may
To judge the combustion case of furnace flame in time, and it is adjusted and controls, realizes the optimization of burning.
Conventional hearth combustion flame temperature measurement method can be divided into contact and contactless two kinds.Contact type measurement method
As traditional thermometry, because being limited to the resistance to elevated temperatures of heated element material, short time measurement can only be carried out, and
Execute-in-place amount is big, can not realize real time on-line monitoring.And its measurement result is the temperature of each measurement point, and it is not our institutes
The whole temperature field in furnace being concerned about, it is seen that this kind of method is not particularly suited for the very strong adverse circumstances of furnace high-temperature and abrasion.It is non-
Contact measuring method includes optical method and acoustic method etc., and it has fast response time, and high sensitivity, resolution ratio is strong, can be preferably
Realize to high temperature, small, rotation, high-speed mobile and corrosivity it is stronger etc. can not contact target temperature survey.
The novel temperature measurement technology that acoustic thermometry is monitored on-line as a kind of boiler combustion based on acoustic wave theory, no
Influenceed by external condition, adapt to the adverse circumstances of the more dirt of various high temperature, burn into, each of whole fire box temperature field can be provided
Partly accurate temperature data, fire box temperature field can continuously be measured, have measurement accuracy height, measurement range wide, real
When monitoring and many advantages, such as remote control.But power plant boiler occurs acutely during actual motion, in stove
Physical-chemical reaction, fluid-dynamic type noise and combustion noise are filled with, the soot blowing of not timing also in boiler, can all made in stove
The frequency moment of noise changes.Signal source sound wave frequency range is typically pre-set used by acoustic thermometry is tested
, if noise frequency range is overlapping with the generation of signal frequency range, then be just difficult to measure accurate sound wave and fly over the time, reduce survey
The accuracy of amount temperature field distribution.
The content of the invention
More excellent sound wave temperature measurement signal can be selected it is an object of the invention to provide a kind of, reduces ambient noise frequency range to sound
The interference of ripple temperature measurement signal, more accurate measurement go out sound wave temperature measurement signal and flown over the time, so as to obtain accurately testing boiler
The boiler sound wave thermometric system and method for interior temperature.
In order to solve problem above, the present invention provides following technical scheme：A kind of boiler sound wave temp measuring system, its feature exist
In including：Industrial computer, power amplifier, pinger and acoustic receiver；
The industrial computer is used for the control program parameter for setting temp measuring system, and analysis selects optimal sound wave temperature measurement signal, production
Raw sound wave temperature measurement signal, and calculate a pot in-furnace temperature；
The power amplifier is used to sound wave temperature measurement signal being amplified；
The pinger is used to send the sound wave temperature measurement signal after amplification；
The acoustic receiver is used for the sound wave temperature measurement signal for gathering boiler ambient noise and being returned by boiler；
The processor is used to select optimal sound wave temperature measurement signal according to the boiler background noise analysis of collection, and according to warp
Flying over the time for the sound wave temperature measurement signal that boiler is beamed back is crossed, calculates a pot in-furnace temperature.
Data collecting card is provided with the industrial computer, card and processor occur for signal；
The data collecting card is used for the control program parameter for setting temp measuring system；
The signal occurs card and is used to produce sound wave temperature measurement signal；
The processor is used to select optimal sound wave temperature measurement signal according to the boiler background noise analysis of collection, and according to warp
Flying over the time for the sound wave temperature measurement signal that boiler is beamed back is crossed, calculates a pot in-furnace temperature.
A kind of boiler sound wave temp measuring method, comprises the following steps：
Step 1, the control program parameter that sound wave temp measuring system is set, start sound wave temp measuring system；
Step 2, collection boiler ambient noise；
Step 3, the optimal sound wave temperature measurement signal of selection；
Step 4, the sound wave temperature measurement signal is produced, the sound wave temperature measurement signal is transmitted into boiler after power amplification, passes through
Collection analysis draws flying over the time for the sound wave temperature measurement signal after boiler returns；
Step 5, flying over the time according to the sound wave temperature measurement signal, calculate a pot in-furnace temperature.
The step 3 selects optimal sound wave temperature measurement signal use to comprise the following steps：
Step 3.1, detection boiler ambient noise, obtain boiler background noise data, boiler background noise data are carried out
Acoustic analysis, sound pressure amplitude-spectrogram is obtained, wherein sound pressure amplitude represents amplitude size using negative form；
Step 3.2, find in the sound pressure amplitude-spectrogram maximum sound pressure amplitude and by the maximum sound pressure amplitude
1.8 times of value respective frequencies are defined as critical frequency, and definition is the main of boiler ambient noise less than the frequency range of critical frequency
Noise frequency range, definition is more than the secondary noise frequency range that the frequency range of critical frequency is boiler ambient noise；
Step 3.3, judge to whether there is burst noise of the sound pressure amplitude in more than α in secondary noise frequency range；
Step 3.4, when sound pressure amplitude is more than α corresponding to secondary noise frequency range, then judge exist in secondary noise frequency range
Burst noise and to define frequency range corresponding to the burst noise be burst noise frequency range, in sound corresponding to the burst noise frequency range
Maximum sound pressure amplitude is found in pressure amplitude value, and the maximum sound pressure amplitude respective frequencies are defined as optimizing initial frequency, by described in
Initial value of the optimizing initial frequency as optimizing frequency range, by the optimizing initial frequency and the critical frequency and value work
For the stop value of optimizing frequency range, step 6 is performed；
Step 3.5, when sound pressure amplitude is less than α corresponding to secondary noise frequency range, then judge not deposit in secondary noise frequency range
In the burst noise, using 500~1000Hz frequency separation as optimizing frequency range, step 6 is performed；
Step 3.6, found in sound pressure amplitude corresponding to the optimizing frequency range using population optimizing algorithm it is minimum
Sound pressure amplitude and the initial frequency using the minimum sound pressure amplitude respective frequencies as sound wave temperature measurement signal, with the 4 of critical frequency value
Frequency range of~5 times of values as the sound wave temperature measurement signal.
α is -60~-100dB in the step 3.4.
Boiler ambient noise in the step 3.1 includes combustion noise and fluid-dynamic noise.
Compared with prior art, the present invention can select optimal sound wave temperature measurement signal, reduce ambient noise frequency range to sound
The interference of ripple temperature measurement signal, and then more accurate measurement goes out sound wave temperature measurement signal and flown over the time, so as to accurately be tested
Temperature in boiler.
Brief description of the drawings
Fig. 1 is the schematic flow sheet that the present invention selects optimal sound wave temperature measurement signal.
Fig. 2 is sound pressure amplitude-spectrogram of the embodiment of the present invention.
Fig. 3 is not carry out reception signal course figure when preferentially.
Fig. 4 is reception signal course figure after carrying out preferentially.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is elaborated.
The sound wave temp measuring system of boiler temperature detection is introduced first, and it includes：Industrial computer, power amplifier, acoustic emission
Device and acoustic receiver, industrial computer is interior to set data collecting card, signal that card and processor occurs, and mainly utilizes PCI slot to insert phase
Connect, pinger is arranged at furnace wall flame-observing hole, acoustic receiver receive be arranged in another several times stove it is strong on.
Due to ambient noise be present in boiler, start sound wave temp measuring system come before testing pot in-furnace temperature, it is necessary to select
The sound wave of optimal frequency range is selected as sound wave temperature measurement signal, to reduce interference of the ambient noise to sound wave temperature measurement signal.
In order to select sound wave temperature measurement signal, specific method such as following steps：
Step 1: detection boiler ambient noise, it includes, combustion noise and fluid-dynamic noise, obtains boiler background and makes an uproar
Sound data, acoustic analysis is carried out to boiler background noise data, obtain sound pressure amplitude-spectrogram, wherein sound pressure amplitude is using negative
Number form formula represents amplitude size, as shown in Figure 2；
Step 2: finding maximum sound pressure amplitude in the sound pressure amplitude-spectrogram and by the 1.5 of the maximum sound pressure amplitude
~2 times of value respective frequencies are defined as critical frequency, and definition is the main of boiler ambient noise less than the frequency range of critical frequency
Noise frequency range, definition is more than the secondary noise frequency range that the frequency range of critical frequency is boiler ambient noise；
Step 3: boiler ambient noise of the sound pressure amplitude more than -60dB is defined as into burst noise, secondary noise is judged
It whether there is burst noise in frequency range；
Step 4: when sound pressure amplitude corresponding to secondary noise frequency range is more than -60dB, then judge to deposit in secondary noise frequency range
In the burst noise and to define frequency range corresponding to the burst noise be burst noise frequency range, in the burst noise frequency range pair
Maximum sound pressure amplitude is found in the sound pressure amplitude answered, and the maximum sound pressure amplitude respective frequencies are defined as optimizing initial frequency,
Initial value using the optimizing initial frequency as optimizing frequency range, by the optimizing initial frequency and the critical frequency
With stop value of the value as optimizing frequency range, step 6 is performed；
Step 5: when sound pressure amplitude corresponding to secondary noise frequency range is less than -60dB, then judge in secondary noise frequency range not
The burst noise be present, using 500~1000Hz frequency separation as optimizing frequency range, perform step 6；
Step 6: found most in a low voice in sound pressure amplitude corresponding to the optimizing frequency range using population optimizing algorithm
Pressure amplitude value and the initial frequency using the minimum sound pressure amplitude respective frequencies as the sound wave temperature measurement signal, with critical frequency value
Frequency range of 4~5 times of values as the sound wave temperature measurement signal.
Optimizing processing is wherein carried out in the optimizing frequency range using population optimizing algorithm, belongs to conventional data
Processing Algorithm, creation of the invention point are, by sound pressure amplitude-spectrogram progress rationalization partition, to determine optimizing frequency range, so
Calculated afterwards using population optimizing algorithm, and calculating process sheet has energy as known data handling procedure, those skilled in the art
Power models according to population optimizing algorithm and carries out data processing in specific optimizing frequency range.It is simple to introduce lower population
The calculating process of optimizing algorithm：The corresponding relation of each parameter value in particle cluster algorithm is determined first：Optimal value is search frequency range
Interior amplitude minimum value, adaptive value are sound pressure amplitude corresponding to particle position, and fitness function is that amplitude-spectrogram is corresponding
Functional relation.Given initialization condition：Search space dimension D=1 (abscissa of particle is a scalar)；Initialize colony
Individual amount N=2, it is contemplated that the optimizing of minimum value is fairly simple, it is only necessary to two initial points can determine that it is more accurate most
Excellent solution；Maximum iteration MaxNum=40 (more than 30 times iteration can seek more accurate optimal solution).Position and speed is more
New formula is：
In formula, x represents the positional information of particle；V represents the velocity information of particle；c1And c2Respectively Particle tracking individual
The weight coefficient of optimal value and population optimal value, is usually taken to be 2；ξ and η is the random number between [0,1], is flown for increasing particle
Capable randomness；piThe history optimal value searched for individual, pgFor the optimal value of whole population；The subscript k of each parameter represents population
Breed kth generation, subscript i represents that some individual in population is i-th of particle.After parameter determines, start population and seek
Excellent algorithm, random initializtion position and velocity information x and v in frequency range at equal intervals on the right side of main noise frequency range, calculate piWith
pg, particle position and velocity information are updated according to formula (1), fitness function value is calculated according to amplitude-spectrogram, updates piWith
pg, with this iteration, reach maximum iteration, optimizing stops, and the sound pressure amplitude minimum value searched in frequency range is exported, as sound
The original frequency of ripple temperature measurement signal.
Actual temperature field sound wave thermometric signal selection method, its based on it is above-mentioned it is a kind of select sound wave temperature measurement signal method,
Including,
Step 1: setting the control program parameter in the industrial computer, start sound wave temp measuring system；
Step 2: before card operation occurs for signal, acoustic receiver device collection boiler ambient noise is first passed through；
Step 3: the optimal sound wave temperature measurement signal of method choice according to above-mentioned selection sound wave temperature measurement signal；
Run Step 4: card occurs for signal and produce the sound wave temperature measurement signal, the sound wave temperature measurement signal is put through power
Big device, pinger and boiler, are finally gathered by acoustic receiver, and the sound wave temperature measurement signal is drawn by industrial computer analysis
Fly over the time；Step 5: flying over the time according to the sound wave temperature measurement signal, calculates a pot in-furnace temperature.
Fig. 3 and Fig. 4 is that preferentially front and rear signal analysis is compared.Preferentially and preferentially the cross-correlation of rear signal is not gone through for comparative analysis
Cheng Tu, it can be seen that the straight line after preferentially among cross-correlation course figure becomes apparent from, i.e., algorithm makes signal cross correlation results peak value
It is more obvious.
Although the embodiment of the present invention is described in detail above in conjunction with the embodiments, need to refer to
Go out, protection scope of the present invention is not limited to these specific embodiments, but is determined by claims.This
Art personnel can carry out appropriate in the range of the technological thought of the present invention and purport is not departed to these embodiments
Change, and the embodiment after these changes is obviously also included within protection scope of the present invention.
Claims (6)
- A kind of 1. boiler sound wave temp measuring system, it is characterised in that including：Industrial computer, power amplifier, pinger and sound wave Receiver；The industrial computer is used for the control program parameter for setting temp measuring system, and analysis selects optimal sound wave temperature measurement signal, generation sound Ripple temperature measurement signal, and calculate a pot in-furnace temperature；The power amplifier is used to sound wave temperature measurement signal being amplified；The pinger is used to send the sound wave temperature measurement signal after amplification；The acoustic receiver is used for the sound wave temperature measurement signal for gathering boiler ambient noise and being returned by boiler；The processor is used to select optimal sound wave temperature measurement signal according to the boiler background noise analysis of collection, and according to by pot Flying over the time for the sound wave temperature measurement signal that stove is beamed back, calculates a pot in-furnace temperature.
- 2. sound wave temp measuring system according to claim 1, it is characterised in that：Be provided with the industrial computer data collecting card, Card and processor occur for signal；The data collecting card is used for the control program parameter for setting temp measuring system；The signal occurs card and is used to produce sound wave temperature measurement signal；The processor is used to select optimal sound wave temperature measurement signal according to the boiler background noise analysis of collection, and according to by pot Flying over the time for the sound wave temperature measurement signal that stove is beamed back, calculates a pot in-furnace temperature.
- 3. a kind of boiler sound wave temp measuring method, it is characterised in that comprise the following steps：Step 1, the control program parameter that sound wave temp measuring system is set, start sound wave temp measuring system；Step 2, collection boiler ambient noise；Step 3, the optimal sound wave temperature measurement signal of selection；Step 4, the sound wave temperature measurement signal is produced, the sound wave temperature measurement signal is transmitted into boiler after power amplification, through boiler Collection analysis draws flying over the time for the sound wave temperature measurement signal after return；Step 5, flying over the time according to the sound wave temperature measurement signal, calculate a pot in-furnace temperature.
- 4. boiler sound wave temp measuring method according to claim 2, it is characterised in that：The step 3 selects optimal cement bond logging Warm signal, which uses, to be comprised the following steps：Step 3.1, detection boiler ambient noise, obtain boiler background noise data, and acoustics is carried out to boiler background noise data Analysis, sound pressure amplitude-spectrogram is obtained, wherein sound pressure amplitude represents amplitude size using negative form；Step 3.2, find in the sound pressure amplitude-spectrogram maximum sound pressure amplitude and by the 1.5~2 of the maximum sound pressure amplitude Value respective frequencies are defined as critical frequency again, and definition is less than the main noise that the frequency range of critical frequency is boiler ambient noise Frequency range, definition is more than the secondary noise frequency range that the frequency range of critical frequency is boiler ambient noise；Step 3.3, judge to whether there is burst noise of the sound pressure amplitude in more than α in secondary noise frequency range；Step 3.4, when sound pressure amplitude is more than α corresponding to secondary noise frequency range, then judge in secondary noise frequency range exist burst Noise and to define frequency range corresponding to the burst noise be burst noise frequency range, in acoustic pressure width corresponding to the burst noise frequency range Maximum sound pressure amplitude is found in value, and the maximum sound pressure amplitude respective frequencies are defined as optimizing initial frequency, by the optimizing Initial value of the initial frequency as optimizing frequency range, using the optimizing initial frequency and the critical frequency and value as seeking The stop value of excellent frequency range, perform step 6；Step 3.5, when sound pressure amplitude is less than α corresponding to secondary noise frequency range, then judge institute is not present in secondary noise frequency range Burst noise is stated, using 500~1000Hz frequency separation as optimizing frequency range, performs step 6；Step 3.6, using population optimizing algorithm find minimum acoustic pressure in sound pressure amplitude corresponding to the optimizing frequency range Amplitude and the initial frequency using the minimum sound pressure amplitude respective frequencies as sound wave temperature measurement signal, with 4~5 times of critical frequency value It is worth the frequency range as the sound wave temperature measurement signal.
- 5. boiler sound wave temp measuring method according to claim 4, it is characterised in that：In the step 3.4 α be -60~- 100dB。
- 6. boiler sound wave temp measuring method according to claim 4, it is characterised in that：Boiler background in the step 3.1 Noise includes combustion noise and fluid-dynamic noise.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680274A (en) * | 2018-04-24 | 2018-10-19 | 华北电力大学 | Air-Cooling Island finned-tube bundle temperature measuring equipment based on acoustic technique and its method |
| CN110646112A (en) * | 2019-09-29 | 2020-01-03 | 东北大学 | Ultrasonic industrial furnace temperature measurement system and method based on multiple sound source arrangement modes |
| CN112212997A (en) * | 2020-09-17 | 2021-01-12 | 上海电机学院 | Ultrasonic wave flight time detection method under multipath condition for power station boiler temperature measurement |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403643A (en) * | 2008-11-14 | 2009-04-08 | 华北电力大学 | Apparatus for measuring combustion chamber flue gas temperature by utilizing acoustics |
| CN105865654A (en) * | 2016-03-23 | 2016-08-17 | 东南大学 | Sound wave temperature measurement signal selection method and boiler temperature measurement method |
-
2016
- 2016-09-26 CN CN201610852212.1A patent/CN107870046A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403643A (en) * | 2008-11-14 | 2009-04-08 | 华北电力大学 | Apparatus for measuring combustion chamber flue gas temperature by utilizing acoustics |
| CN105865654A (en) * | 2016-03-23 | 2016-08-17 | 东南大学 | Sound wave temperature measurement signal selection method and boiler temperature measurement method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680274A (en) * | 2018-04-24 | 2018-10-19 | 华北电力大学 | Air-Cooling Island finned-tube bundle temperature measuring equipment based on acoustic technique and its method |
| CN110646112A (en) * | 2019-09-29 | 2020-01-03 | 东北大学 | Ultrasonic industrial furnace temperature measurement system and method based on multiple sound source arrangement modes |
| CN112212997A (en) * | 2020-09-17 | 2021-01-12 | 上海电机学院 | Ultrasonic wave flight time detection method under multipath condition for power station boiler temperature measurement |
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