CN107064113A - One kind realizes burner coal dust firing quality detecting system and method using optical fiber - Google Patents
One kind realizes burner coal dust firing quality detecting system and method using optical fiber Download PDFInfo
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- CN107064113A CN107064113A CN201710442165.8A CN201710442165A CN107064113A CN 107064113 A CN107064113 A CN 107064113A CN 201710442165 A CN201710442165 A CN 201710442165A CN 107064113 A CN107064113 A CN 107064113A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/716—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited by measuring the radiation emitted by a test object treated by combustion gases for investigating the composition of gas mixtures
Abstract
The invention discloses one kind burner coal dust firing quality detecting system and method are realized using optical fiber, wherein the system includes fibre optical sensor, it is arranged at burner mouthful, and the flame optical signal being configured as in collection burner is simultaneously sent in processor through optical-electrical converter；The processor, is configured as the signal after being changed to optical-electrical converter and is sampled and spectrum analysis, so as to isolate the scintillation intensity of radiation intensity and flame in signal in each Frequency point；Again revised background radiation intensity is calculated by correcting unburned particulate matter to the occlusion effect of background；The burning quality of burner coal dust is described using revised background radiation intensity.
Description
Technical field
The invention belongs to field of thermal power, more particularly to one kind burner coal dust firing quality testing is realized using optical fiber
System and method.
Background technology
In field of thermal power, it is principal mode that coal dust firing, which generates electricity,.Coal is worn into after powdery by hot blast by coal pulverizer
Hearth combustion is sent into by pipeline (tube cell) together with coal dust.Boiler combustion stability, economy and environmental protection index etc. will
Ask and each depend on ature of coal and coal-air ratio example regulation and control.On the evaluation of ature of coal, mainly by chemical analysis and sampling observation method.And coal-air ratio example
Accurate control be always boiler combustion field hard nut to crack.The method of current coal-air ratio example control be exactly mainly regulation and control to
Powder machine rotating speed, and machine supplying powder rotating speed is nonlinear with coal-supplying amount so that the wind and powder on-line system effect of input is not ideal.
Cause this result main reason is that in wind powder mixture the measurement and control of coal powder density be problematic in that.Measurement of concetration
Inaccurate, control is not just known where to begin yet, and measurement of concetration is to realize the premise accurately controlled.Current measurement of concetration is typically former using electric charge
Logos, i.e. carry positive charge using coal dust, coal powder density is bigger, and the voltage on induction electrode is then higher.
Because current thermal power generation unit all realizes AGC controls substantially, so-called AGC is exactly Automatic Generation Control, hair
Group of motors load instruction from power network dispatching system from motion tracking and response, whole generating set is followed automatically equivalent to one
Actuator.Therefore, AGC control essence is exactly the balance control of energy, and the energy of generating set derives from hearth combustion
The heat of generation.Therefore the monitoring to burner hearth caloric value is most direct and effective monitoring.But measured currently for coal powder density
And wind and powder on-line system is all only one kind measurement and regulation and control indirectly to supply side energy, is lacked most directly to hearth combustion
The monitoring means of monitoring and the regulation and control of situation.
The content of the invention
In order to solve the deficiencies in the prior art, burner coal dust firing quality is realized using optical fiber the invention provides one kind
Detecting system, the system carries out direct opto-electronic conversion to the fiber-optic signal using burner as observation station, and by believing after conversion
Number analysis, respectively be isolated by react observation station radiation intensity and unburned particulate matter flame scintillation intensity, then pass through amendment
Unburned particulate matter calculates the occlusion effect of background revised background radiation intensity；Utilize revised background radiation intensity
To describe the burning quality of burner coal dust.
The utilization optical fiber of the present invention realizes burner coal dust firing quality detecting system, including：
Fibre optical sensor, it is arranged at burner mouthful, the flame optical signal for being configured as gathering in burner and through photoelectricity
Converter is sent in processor；
The processor, is configured as the signal after being changed to optical-electrical converter and is sampled and spectrum analysis, so that point
Separate out the scintillation intensity of radiation intensity and flame in signal in each Frequency point；Again by correcting screening of the unburned particulate matter to background
Effect is kept off to calculate revised background radiation intensity；The combustion of burner coal dust is described using revised background radiation intensity
Burn quality；
Wherein, during revised background radiation intensity is calculated, first with flame each Frequency point flicker
Intensity, calculating coal dust firing degree is used to describe coverage extent；Recycle coal dust firing degree to correct background radiation intensity, repair
Background radiation intensity after just is the ratio of radiation intensity and coal dust firing degree.
Further, the optical-electrical converter includes the photo resistance of integrated operational amplifier and connection connected in parallel, institute
State integrated operational amplifier end of oppisite phase input be superimposed with the negative feedback voltage of photo resistance after output.
Wherein, photo resistance is resistance type sensor, and optical-electrical converter takes photo resistance undistorted resistance ---
Voltage transformation, input signal is defeated after the inverting input of integrated operational amplifier is superimposed with the negative feedback voltage of photo resistance
Go out, be in inverse relation between output voltage and infrared intensity (photo resistance and infrared intensity are in inverse ratio).
Further, the processor is additionally configured to the signal after being changed using least-squares algorithm to optical-electrical converter
Sampled and spectrum analysis.
The present invention is sampled and spectrum analysis using least-squares algorithm to signal, and this method has higher when frequency division
Precision is analysed, the spectrum signature of signal can be accurately recognized, and can more accurately portray the position and border of reservoir, can
Further improve the precision of reservoir prediction.
Further, the processor is also connected by bus with monitoring host computer.
Present invention also offers the detection method that burner coal dust firing quality detecting system is realized using optical fiber.
The utilization optical fiber of the present invention realizes the detection method of burner coal dust firing quality detecting system, including：
Fibre optical sensor gathers the flame optical signal in burner and is sent to through optical-electrical converter in processor；
Signal after processor is changed to optical-electrical converter is sampled and spectrum analysis, so as to isolate the spoke in signal
Penetrate the scintillation intensity of intensity and flame in each Frequency point；The occlusion effect of background is repaiied to calculate by correcting unburned particulate matter again
Background radiation intensity after just；The burning quality of burner coal dust is described using revised background radiation intensity；
Wherein, during revised background radiation intensity is calculated, first with flame each Frequency point flicker
Intensity, calculating coal dust firing degree is used to describe coverage extent；Recycle coal dust firing degree to correct background radiation intensity, repair
Background radiation intensity after just is the ratio of radiation intensity and coal dust firing degree.
Further, the signal after being changed using least-squares algorithm to optical-electrical converter is sampled and spectrum analysis.
Further, the signal after being changed using least-squares algorithm to optical-electrical converter is sampled and spectrum analysis
Detailed process is：
According to Shen agriculture sampling theory, frequency and the sampling period of the signal after optical-electrical converter conversion are determined；
According to least-squares algorithm, a least square filter is constructed；
Signal after being changed according to least square filter to optical-electrical converter is filtered processing, obtains optical-electrical converter
The DC component of signal after conversion and the harmonic amplitude of each Frequency point, are designated as radiation intensity and flame in each frequency respectively
The scintillation intensity of point.
Further, coal dust firing degree is the maximum average flicker intensity of coal dust and the average flicker intensity of all coal dusts
Difference ratio again with the maximum average flicker intensity of coal dust.
Further, when the scintillation intensity of each Frequency point of coal dust reaches maximum, coal dust firing degree is minimum, explanation
Serious shielding.
Further, this method also includes：The burning quality of burner coal dust is also sent to prison by processor by bus
Control main frame is monitored in real time.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) in coal dust firing quality determining method proposed by the present invention, background is blocked by correcting unburned particulate matter
Effect calculates revised background radiation intensity；The burning of burner coal dust is described using revised background radiation intensity
Quality, is that flame status detection, burning quality detection etc. provide theoretical foundation；
(2) coal dust firing quality determining method proposed by the present invention realizes the quantitatively evaluating index of coal dust firing degree；
(3) burning quality detection method proposed by the present invention, become more meticulous burning to current field of thermal power raising boiler
Adjustment level and Environmental Protection Level have direct help, have filled up the blank in the field, with huge economic benefit
And social benefit.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not constitute the improper restriction to the application.
The utilization optical fiber that Fig. 1 is the present invention realizes burner coal dust firing quality detecting system structural representation；
Fig. 2 is the optical-electrical converter structural representation of the present invention；
Fig. 3 is that the boiler combustion realized according to the present invention monitors picture.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
The utilization optical fiber that Fig. 1 is the present invention realizes burner coal dust firing quality detecting system structural representation.
As shown in figure 1, the utilization optical fiber of the present invention realizes burner coal dust firing quality detecting system, including：
Fibre optical sensor, it is arranged at burner mouthful, the flame optical signal for being configured as gathering in burner and through photoelectricity
Converter is sent in processor；
The processor, is configured as the signal after being changed to optical-electrical converter and is sampled and spectrum analysis, so that point
Separate out the scintillation intensity of radiation intensity and flame in signal in each Frequency point；Again by correcting screening of the unburned particulate matter to background
Effect is kept off to calculate revised background radiation intensity；The combustion of burner coal dust is described using revised background radiation intensity
Burn quality；
Wherein, during revised background radiation intensity is calculated, first with flame each Frequency point flicker
Intensity, calculating coal dust firing degree is used to describe coverage extent；Recycle coal dust firing degree to correct background radiation intensity, repair
Background radiation intensity after just is the ratio of radiation intensity and coal dust firing degree.
Because of coal dust occlusion effect, the signal radiation intensity isolated, that is, the DC component of flame optical signal be in fact
The radiation intensity of observation station, rather than background radiation intensity, background radiation intensity must be according to shielding rate of the coal dust to bias light
It is modified.
Size and blinking characteristics of the flame on fundamental wave point and each harmonic Frequency point, have reacted particulate matter in burner hearth wind field
In motion feature, feature is more obvious, illustrates that particle concentration is bigger, concentration is more big, blocks more serious to bias light, therefore,
This feature is a kind of negative contribution to bias light.
Coverage extent is described with following coal dust firing degree E：
Wherein, Umax--- for maximum average flicker intensity.When each scintillation intensity reaches maximum, E minimum (tending to be 0),
Illustrate serious shielding, when each scintillation intensity very little, E is very big (tending to be 1) on the contrary, illustrates that occlusion effect is smaller.
Therefore, real background intensity U should reversely be corrected according to E size.Revised background intensity U is：
The radiation intensity U that above formula comprehensive description observation station is directly observed0, coal dust firing degree E, coal dust fires to the greatest extent front end
Relation between radiation intensity U, also describes and represents the burning quality of burner.
As shown in Fig. 2 optical-electrical converter includes the photo resistance of integrated operational amplifier and connection connected in parallel, the collection
Into operational amplifier end of oppisite phase input be superimposed with the negative feedback voltage of photo resistance after output.
Wherein, photo resistance is resistance type sensor, and optical-electrical converter takes photo resistance undistorted resistance ---
Voltage transformation, input signal is defeated after the inverting input of integrated operational amplifier is superimposed with the negative feedback voltage of photo resistance
Go out, be in inverse relation between output voltage and infrared intensity (photo resistance and infrared intensity are in inverse ratio).
Wherein, the processor is additionally configured to the signal progress after being changed using least-squares algorithm to optical-electrical converter
Sampling and spectrum analysis.
Specifically, using least-squares algorithm to optical-electrical converter change after signal sampled and spectrum analysis tool
Body process is：
Step one：According to Shen agriculture sampling theory, frequency and the sampling period of the signal after optical-electrical converter conversion are determined；
According to Fourier function theory, any one function is represented by the Fourier letter for ω such as next fundamental frequency
Number：
Wherein, U0- DC component；λ-DC component attenuation coefficient；UkThe amplitude of-kth subharmonic；ω --- fundamental wave electricity
The angular frequency of stream or voltage；θk--- the initial phase angle of kth subharmonic.K=1,2 ..., M.
According to Shen agriculture sampling theory, as long as sample frequency f is more than twice of signal frequency, it is possible to from discrete sampling sample
Each periodic function component sin (k ω t) in continuous function, including u (t) etc. is recovered in this.Herein, it is such as recognizable with highest
Frequency is exemplified by 119Hz, then sample frequency f is necessary for more than 238Hz, in fast Fourier algorithm, and sample frequency f is generally
More than ten times of signal frequency, e.g., will recover 119Hz signals, sample frequency generally requires more than 1190Hz frequency.
Step 2：According to least-squares algorithm, a least square filter is constructed；
Spectrum analysis is exactly to pass through sampled signal sequence, final to obtain U0、λ、Uk、θk.At present, two methods realize
Above-mentioned target, Fourier algorithm and least-squares algorithm.The present invention uses least-squares algorithm.Therefore, first by Fourier function
Deploy and simplify.
By the U in Fourier functional expression0e-λtBy Taylor series expansion, first two are taken, then：
U0e-λt≈U0-U0λt
By sin (k ω t+ θk) by trigonometric function expansion, arrange, then：
Uksin(kωt+θk)=sin (k ω t) Ukcos(θk)+cos(kωt)Uksin(θk)
From the angle of complex function, wherein, Ukcos(θk) and Uksin(θk) it is exactly to need kth subharmonic arrow to be measured
The real and imaginary parts of amount.And in the case where fundamental wave and sample frequency are fixed, function space sequence sin (k ω ti) and cos (k ω
ti) in the time window of each cycle period it is a fixed value.Therefore, according to least square criterion, every time after sampling
Relation equation between sample and each function composition is：
ti--- ith sampling instant.After the sampling of continuous n times, N number of equation will be obtained.If by U0、U0λ, and
The real and imaginary parts of all harmonic waves represent that then n times sampled result can use following matrix equation table as unknown quantity, and with matrix
Show：
According to equal interval sampling, thenT --- fundamental wave period of a function.
If representing above-mentioned N rows, the coefficient matrix of 2 (M+1) row with A, the variable to be measured of single-row 2 (M+1) rows is represented with X
Matrix, single-row sampling matrix is represented with U, then above-mentioned sampling matrix is represented by：
AX=U
The column element of coefficient matrices A the 3rd represents to illustrate numerical value of the sin (ω t) in each sampling instant, A the 4th row member
Element illustrates numerical value of the cos (ω t) in each sampling instant.A the 5th column element illustrates second harmonic sin (2 ω t) each
The numerical value of individual sampling instant, the like.
Because coefficient matrices A certainly exists inverse matrix A-1, therefore：
X=A-1·U
Wherein, inverse matrix A-1Dimension be 2 (M+1) * N.
A-1It is least square filter.Once sampling period, A have selected according to the first step-1Being one can count in advance
The constant matrices of calculation.
Step 3：Signal after being changed according to least square filter to optical-electrical converter is filtered processing, obtains light
The DC component and the harmonic amplitude of each Frequency point of signal after electric transducer conversion, are designated as radiation intensity and flame respectively
In the scintillation intensity of each Frequency point.
According to matrix X definition and equation X=A-1U, then：
Fundamental wave cubage process is：
The calculating process of kth subharmonic is：
The present invention is sampled and spectrum analysis using least-squares algorithm to signal, and this method has higher when frequency division
Precision is analysed, the spectrum signature of signal can be accurately recognized, and can more accurately portray the position and border of reservoir, can
Further improve the precision of reservoir prediction.
For example：Temperature is detected for the #2 stove fires of Hua electricity Qingdao electricity generating corporation, Ltd, the unit has 28 fibre optical sensors,
Respectively optical fiber flame detecting device, each device is divided into front-end probe and back-end controller two parts, and front-end probe is realized
Circuit in sampling by optical fiber and opto-electronic conversion, probe is circuit shown in Fig. 2.Flame optical signal is converted to electric current letter without distortions
Number, the controller into rear end is analyzed and processed.
28 fibre optical sensors constitute coal dust in complete set monitoring system, boiler by RS-485 buses and monitoring host computer
Combustion position and quality are shown in main frame monitoring picture.
Present invention also offers the detection method that burner coal dust firing quality detecting system is realized using optical fiber.
The utilization optical fiber of the present invention realizes the detection method of burner coal dust firing quality detecting system, including：
(1) fibre optical sensor gathers the flame optical signal in burner and is sent to through optical-electrical converter in processor；
(2) signal after processor is changed to optical-electrical converter is sampled and spectrum analysis, so as to isolate in signal
Radiation intensity and flame each Frequency point scintillation intensity；Counted again by correcting unburned particulate matter to the occlusion effect of background
Calculate revised background radiation intensity；The burning quality of burner coal dust is described using revised background radiation intensity；
Wherein, during revised background radiation intensity is calculated, first with flame each Frequency point flicker
Intensity, calculating coal dust firing degree is used to describe coverage extent；Recycle coal dust firing degree to correct background radiation intensity, repair
Background radiation intensity after just is the ratio of radiation intensity and coal dust firing degree.
Specifically, the signal after being changed using least-squares algorithm to optical-electrical converter is sampled and spectrum analysis.
Specifically, using least-squares algorithm to optical-electrical converter change after signal sampled and spectrum analysis tool
Body process is：
Step one：According to Shen agriculture sampling theory, frequency and the sampling period of the signal after optical-electrical converter conversion are determined；
According to Fourier function theory, any one function is represented by the Fourier letter for ω such as next fundamental frequency
Number：
Wherein, U0- DC component；λ-DC component attenuation coefficient；UkThe amplitude of-kth subharmonic；ω --- fundamental wave electricity
The angular frequency of stream or voltage；θk--- the initial phase angle of kth subharmonic.K=1,2 ..., M.
According to Shen agriculture sampling theory, as long as sample frequency f is more than twice of signal frequency, it is possible to from discrete sampling sample
Each periodic function component sin (k ω t) in continuous function, including u (t) etc. is recovered in this.Herein, it is such as recognizable with highest
Frequency is exemplified by 119Hz, then sample frequency f is necessary for more than 238Hz, in fast Fourier algorithm, and sample frequency f is generally
More than ten times of signal frequency, e.g., will recover 119Hz signals, sample frequency generally requires more than 1190Hz frequency.
Step 2：According to least-squares algorithm, a least square filter is constructed；
Spectrum analysis is exactly to pass through sampled signal sequence, final to obtain U0、λ、Uk、θk.At present, two methods realize
Above-mentioned target, Fourier algorithm and least-squares algorithm.The present invention uses least-squares algorithm.Therefore, first by Fourier function
Deploy and simplify.
By the U in Fourier functional expression0e-λtBy Taylor series expansion, first two are taken, then：
U0e-λt≈U0-U0λt
By sin (k ω t+ θk) by trigonometric function expansion, arrange, then：
Uksin(kωt+θk)=sin (k ω t) Ukcos(θk)+cos(kωt)Uksin(θk)
From the angle of complex function, wherein, Ukcos(θk) and Uksin(θk) it is exactly to need kth subharmonic arrow to be measured
The real and imaginary parts of amount.And in the case where fundamental wave and sample frequency are fixed, function space sequence sin (k ω ti) and cos (k ω
ti) in the time window of each cycle period it is a fixed value.Therefore, according to least square criterion, every time after sampling
Relation equation between sample and each function composition is：
ti--- ith sampling instant.After the sampling of continuous n times, N number of equation will be obtained.If by U0、U0λ, and
The real and imaginary parts of all harmonic waves represent that then n times sampled result can use following matrix equation table as unknown quantity, and with matrix
Show：
According to equal interval sampling, thenT --- fundamental wave period of a function.
If representing above-mentioned N rows, the coefficient matrix of 2 (M+1) row with A, the variable to be measured of single-row 2 (M+1) rows is represented with X
Matrix, single-row sampling matrix is represented with U, then above-mentioned sampling matrix is represented by：
AX=U
The column element of coefficient matrices A the 3rd represents to illustrate numerical value of the sin (ω t) in each sampling instant, A the 4th row member
Element illustrates numerical value of the cos (ω t) in each sampling instant.A the 5th column element illustrates second harmonic sin (2 ω t) each
The numerical value of individual sampling instant, the like.
Because coefficient matrices A certainly exists inverse matrix A-1, therefore：
X=A-1·U
Wherein, inverse matrix A-1Dimension be 2 (M+1) * N.
A-1It is least square filter.Once sampling period, A have selected according to the first step-1Being one can count in advance
The constant matrices of calculation.
Step 3：Signal after being changed according to least square filter to optical-electrical converter is filtered processing, obtains light
The DC component and the harmonic amplitude of each Frequency point of signal after electric transducer conversion, are designated as radiation intensity and flame respectively
In the scintillation intensity of each Frequency point.
According to matrix X definition and equation X=A-1U, then：
Fundamental wave cubage process is：
The calculating process of kth subharmonic is：
Because of coal dust occlusion effect, the signal radiation intensity isolated, that is, the DC component of flame optical signal be in fact
The radiation intensity of observation station, rather than background radiation intensity, background radiation intensity must be according to shielding rate of the coal dust to bias light
It is modified.
Size and blinking characteristics of the flame on fundamental wave point and each harmonic Frequency point, have reacted particulate matter in burner hearth wind field
In motion feature, feature is more obvious, illustrates that particle concentration is bigger, concentration is more big, blocks more serious to bias light, therefore,
This feature is a kind of negative contribution to bias light.
Coverage extent is described with following coal dust firing degree E：
Wherein, Umax--- for maximum average flicker intensity.When each scintillation intensity reaches maximum, E minimum (tending to be 0),
Illustrate serious shielding, when each scintillation intensity very little, E is very big (tending to be 1) on the contrary, illustrates that occlusion effect is smaller.
Therefore, real background intensity U should reversely be corrected according to E size.Revised background intensity U is：
The radiation intensity U that above formula comprehensive description observation station is directly observed0, coal dust firing degree E, coal dust fires to the greatest extent front end
Relation between radiation intensity U, also describes and represents the burning quality of burner.
This method also includes：The burning quality of burner coal dust is also sent to monitoring host computer by bus and carried out by processor
Monitoring in real time.
In coal dust firing quality determining method proposed by the present invention, by correcting occlusion effect of the unburned particulate matter to background
To calculate revised background radiation intensity；The burning matter of burner coal dust is described using revised background radiation intensity
Amount, is that flame status detection, burning quality detection etc. provide theoretical foundation；
Coal dust firing quality determining method proposed by the present invention realizes the quantitatively evaluating index of coal dust firing degree；
Burning quality detection method proposed by the present invention, become more meticulous firing optimization to current field of thermal power raising boiler
Level and Environmental Protection Level have direct help, have filled up the blank in the field, with huge economic benefit and society
Can benefit.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (10)
1. one kind realizes burner coal dust firing quality detecting system using optical fiber, it is characterised in that including：
Fibre optical sensor, it is arranged at burner mouthful, the flame optical signal for being configured as gathering in burner and through opto-electronic conversion
Device is sent in processor；
The processor, is configured as the signal after being changed to optical-electrical converter and is sampled and spectrum analysis, so as to isolate
The scintillation intensity of radiation intensity and flame in signal in each Frequency point；Effect is blocked to background by correcting unburned particulate matter again
Revised background radiation intensity should be calculated；The burning matter of burner coal dust is described using revised background radiation intensity
Amount；
Wherein, during revised background radiation intensity is calculated, first with flame each Frequency point scintillation intensity,
Calculating coal dust firing degree is used to describe coverage extent；Coal dust firing degree is recycled to correct background radiation intensity, after amendment
Background radiation intensity for radiation intensity and coal dust firing degree ratio.
2. one kind as claimed in claim 1 realizes burner coal dust firing quality detecting system using optical fiber, it is characterised in that
The optical-electrical converter includes the photo resistance of integrated operational amplifier and connection connected in parallel, the integrated operational amplifier
End of oppisite phase input is exported after being superimposed with the negative feedback voltage of photo resistance.
3. one kind as claimed in claim 1 realizes burner coal dust firing quality detecting system using optical fiber, it is characterised in that
The processor is additionally configured to the signal after being changed using least-squares algorithm to optical-electrical converter and sampled and frequency spectrum point
Analysis.
4. one kind as claimed in claim 1 realizes burner coal dust firing quality detecting system using optical fiber, it is characterised in that
The processor is also connected by bus with monitoring host computer.
5. a kind of utilization optical fiber as claimed in claim 1 realizes the detection method of burner coal dust firing quality detecting system,
It is characterised in that it includes：
Fibre optical sensor gathers the flame optical signal in burner and is sent to through optical-electrical converter in processor；
Signal after processor is changed to optical-electrical converter is sampled and spectrum analysis, so that the radiation isolated in signal is strong
The scintillation intensity of degree and flame in each Frequency point；Calculated again by correcting unburned particulate matter to the occlusion effect of background after amendment
Background radiation intensity；The burning quality of burner coal dust is described using revised background radiation intensity；
Wherein, during revised background radiation intensity is calculated, first with flame each Frequency point scintillation intensity,
Calculating coal dust firing degree is used to describe coverage extent；Coal dust firing degree is recycled to correct background radiation intensity, after amendment
Background radiation intensity for radiation intensity and coal dust firing degree ratio.
6. realizing the detection method of burner coal dust firing quality detecting system using optical fiber as claimed in claim 5, it is special
Levy and be, the signal after being changed using least-squares algorithm to optical-electrical converter is sampled and spectrum analysis.
7. realizing the detection method of burner coal dust firing quality detecting system using optical fiber as claimed in claim 6, it is special
Levy and be, using least-squares algorithm to optical-electrical converter change after signal sampled and spectrum analysis detailed process
For：
According to Shen agriculture sampling theory, frequency and the sampling period of the signal after optical-electrical converter conversion are determined；
According to least-squares algorithm, a least square filter is constructed；
Signal after being changed according to least square filter to optical-electrical converter is filtered processing, obtains optical-electrical converter conversion
The DC component of signal afterwards and the harmonic amplitude of each Frequency point, are designated as radiation intensity and flame in each Frequency point respectively
Scintillation intensity.
8. realizing the detection method of burner coal dust firing quality detecting system using optical fiber as claimed in claim 5, it is special
Levy and be, coal dust firing degree for coal dust maximum average flicker intensity and all coal dusts average flicker intensity difference again with coal
The ratio of the maximum average flicker intensity of powder.
9. realizing the detection method of burner coal dust firing quality detecting system using optical fiber as claimed in claim 5, it is special
Levy and be, when the scintillation intensity of each Frequency point of coal dust reaches maximum, coal dust firing degree is minimum, illustrates serious shielding.
10. realizing the detection method of burner coal dust firing quality detecting system using optical fiber as claimed in claim 5, it is special
Levy and be, this method also includes：The burning quality of burner coal dust is also sent to monitoring host computer by bus and carried out by processor
Monitoring in real time.
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| CN107525751A (en) * | 2017-08-24 | 2017-12-29 | 山东泰景电力科技有限公司 | A kind of method and apparatus of ultraviolet source method detection wind powder ratio and flow velocity |
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| CN107525751B (en) * | 2017-08-24 | 2020-04-28 | 山东泰景电力科技有限公司 | Method and device for detecting wind-powder ratio and flow velocity by ultraviolet light source method |
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