CN103423763A - Method for correcting radiation energy signal static deviation - Google Patents
Method for correcting radiation energy signal static deviation Download PDFInfo
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Abstract
The invention provides a method for correcting radiation energy signal static deviation, and belongs to the technical field of boiler combustion monitoring and control of a thermal power plant. Firstly, a video collection card is driven to finish the collection of flame images and extract RGB color information of each pixel point, and the coking state of each detector is judged according to the R value. Secondly, the ash accumulation state of each detector is judged according to a correlation coefficient, the quantity and the serial numbers of effective detectors are counted, and the radiation energy signals of the effective detectors are extracted and are corrected in a ratio mode. Finally, averages of the radiation energy signals of all the effective detectors are obtained and output in a filtering mode. The operation result shows that the radiation energy signals corrected through the method can eliminate radiation energy signal static deviation caused by operation performance variation factors such as ash accumulation, coking and zero wandering of the detectors and ash accumulation and coking of a boiler, radiation energy signals which are high in reliability, accurate and stable are provided, the pulsatility of flames in a hearth can be effectively reflected, and continuous use of a radiation energy control system is guaranteed.
Description
Technical field
The present invention relates to heat power plant boiler combustion monitoring and control technology field, relate in particular to a kind of method of revising the radiant energy signal static deviation of required stove internal combustion energy level under accurate reflection fossil-fired unit different load.
Background technology
At present, a kind of coal burning boiler of power station stove internal combustion Fire Radiation signal detecting method and technology based on radiant image proposed in prior art, this utilization 4-20 props up high temperature resistant flame detector and is arranged on pulverized coal firing boiler, take continuously Flame Image, therefrom extract burning radiation energy signal for the fired power generating unit combustion control, obtained certain control effect, Zhou Huaichun, Lou new life, Yin Heling etc. " adopt the station boiler fuel adjusting object modeling of radiant energy signal and control simulation study " (Proceedings of the CSEE, 2001, 21 (2): 85-88), Zhang Shishuai, Zhou Huaichun, Huang Yongli etc., " adopting the fired power generating unit load control system simulation study of radiant energy feedback signal " (Proceedings of the CSEE, 2001,21 (2): 85-88), Zhang Shishuai, Zhou Huaichun, Peng Min etc., " research is controlled in the coal-fired unit burning in the power station based on furnace radiant energy signal " (Proceedings of the CSEE, 2002,22 (11): 156-160), Zhou Huaichun, " the visual detection philosophy and technique of furnace flame " (Science Press, in May, 2005).The key of this control technology is the extraction of radiant energy signal, and Luo Zixue, Yang Chao, Zhou Huaichun etc. propose " extraction mechanism and the application study thereof of furnace radiant energy signal " (power engineering, 2005,25 (3): 374-377).
Some radiant energy computational methods have been reported in correlative study.The Yu Daren of Harbin Institute of Technology etc. carries out spectrum analysis to radiant energy signal, utilize complementary FRF (frequency response function) radiant energy signal to be revised to (Yu Daren, model are lost, Xu Zhiqiang, " information fusion method of furnace radiant energy signal and heat signal ", Proceedings of the CSEE, 2003,23(4): 158-161,171); The Chang Ruili of Zhejiang University etc. utilizes the method for spectrum analysis to calculate the radiation of burner hearth energy, and computational methods are comparatively complicated, practical application difficulty (Chang Ruili, Wang Fei, yellow groups of stars etc., radiant energy signal spectral distribution property experimental study in coal-powder boiler, generating equipment, 2006, No.2); The method that the employing blackbody furnaces such as the large anchor of poplar are demarcated can have been carried out theory analysis and experimental study to radiation of burner hearth, do not drop into engineering application (Yang Damao, Liu He, Li Sheng, " measure theory analysis and the experimental study of radiant energy in stove ", modern electric, 2006,23 (4)): 53-56); (Luo Zixue, Yang Chao, the Zhou Huaichun such as Luo Zixue, " extraction mechanism and the application study thereof of furnace radiant energy signal ", power engineering, 2005,25 (3): 374-377) studied a kind of radiant energy signal extracting method based on the gradation of image value, by gray value the normalization of calculating all pixels, obtained the three-dimensional average gray value of burner hearth, this signal extraction is simple, quick, in engineering reality, be applied, but that this signal is affected by picture quality is larger.
In sum, radiant energy signal can quick and precisely reflect the furnace cavity combustion position, strong with the relevance of unit.But jitter, pulsation is large, poor reliability, particularly, in using ash coal kind boiler, the dust stratification at detector camera lens place and coking be the accuracy of interference emission energy calculated signals greatly.Detector in use, block, camera lens place dust stratification, eyeglass variable color etc. all can exert an influence to the accurate collection of radiant energy signal by coking, and we are referred to as static deviation by such impact here.Static deviation can't be directly by image identifying out, and it changes slowly, and deviation progressively accumulates, and causes the most at last the complete distortion of data, causes the misoperation of controller, affects the stability of radiant energy signal control system.
The basis that radiant energy signal is controlled for burning be a kind of online measuring technique of releasing energy using it as the stove combustion process (Zhou Huaichun, the visual detection philosophy and technique of furnace flame, Science Press, in May, 2005, pp.306-309).Except the factors such as the dust stratification at aforementioned detector device camera lens place and coking affect the energy level that radiant energy signal correctly reflects that the stove combustion process discharges, the performance variation occurred after the long-term operation of boiler itself, for example after the long-term operation of boiler tube because material changes, the boiler heat-transfer hydraulic performance decline that the factor such as dust deposit in furnace and coking causes, make radiant energy level rising in stove under unit same load level, at this moment, under different load, variation has occurred in the interior ideal radiation energy level of stove, control the stove internal combustion if continue to use under the different load of boiler performance before changing ideal radiation energy signal level in stove, too high estimation capacity of furnace level will occur, send the false command that reduces capacity of furnace supply (by fuel and wind).
Therefore, for guaranteeing that radiant energy signal detects and the continuous, correct of control system used, must be revised the static deviation of detector.Revise pulsation and the static deviation of radiant energy signal, need to solve following three problems: a reference value (quiescent value) of one, setting up radiant energy signal; Two, the accurate judgement of detector dust stratification and coking state; Three, revise the individual difference that detector brings because of differences such as installation site, aperture, shutter speeds.
Thought by the PD controller, utilize the real power calculation radiant energy signal quiescent value of sending out of unit, the radiant energy signal measured is introduced to a relative coefficient judgement link and a proportionality coefficient correction link, eliminate the static deviation that detector dust stratification, coking, null offset etc. are introduced.
Summary of the invention
The object of the invention is to eliminate the radiant energy signal static deviation that the runnability changing factors such as detector factor, collecting ash, coking such as the sticky ash of detector, coking, null offset are introduced, provide strong, accurate, a stable radiant energy signal of reliability to participate in unit coal-burning amount and air quantity control, improve combustion economization.
In order to address the above problem, the technical solution adopted in the present invention is:
A kind of method of revising the radiant energy signal static deviation has following steps:
S100. drive video frequency collection card to complete the collection of flame image and extract each pixel RGB colouring information;
S200. utilize in above-mentioned image the valid pixel judgement detector coking state of counting out; Utilize relative coefficient judgement detector dust stratification state; Add up effective detector number and numbering, extract the radiant energy signal of effective detector and do the ratio correction;
S300. the radiant energy signal of all effective detectors is averaged to rear filtering output.
The step of the judgement detector coking state described in step S200 is: S201. selected detector image central region is as besel; S202. add up the inner effective pixel points number of described besel; S203. described effective pixel points number and reservation threshold are made comparisons, reach the effective detector of being made as of described reservation threshold.After the place's coking of detector camera lens, the image complete blackening that is blocked, each pixel R value reduces rapidly, can determine by the threshold values of setting the R value state of detector coking.
The real relative coefficient of sending out between power signal of the dust stratification of detector described in step S200 state basis for estimation radiant energy signal and unit, described detector when the relative coefficient of gained is less than reservation threshold as calculated this detector be set to invalid.Relative coefficient is the index of weighing linear correlation degree between two stochastic variables, when detector camera lens place dust stratification, the radiant energy signal gathered can reduce gradually, present and the inconsistent variation tendency of normal radiation energy signal, be embodied in and the real relative coefficient of sending out between power signal of unit reduces.Calculate radiant energy signal and the real relative coefficient D sent out between power signal of unit of each detector, determine the state of detector dust stratification by the threshold values of setting the D value.
The correction of ratio described in step S200 is according to the real correlation of sending out between power signal and radiant energy signal of unit, adopt the real power signal of described unit to calculate the quiescent value of described radiant energy signal, described quiescent value obtains scale factor divided by nearest available energy data.The individual difference of bringing because of difference such as installation site, aperture, shutter speeds for revising detector, revise the static deviation of radiant energy signal because of the introducing of camera lens dust deposition, and the radiant energy signal of each detector collection is carried out to ratio P correction.Adopt the real power signal of unit to calculate the quiescent value of radiant energy signal, interior effective radiant energy data obtain the P factor (to be generally 1 hour) for the previous period divided by current time, revise the radiant energy signal that current time gathers.Adopting this modification method, is also to overcome the runnability changing factors such as collecting ash, the coking pair method made a difference with the correct judgement of the corresponding ideal radiation energy level of loading.Even after the long-term operation of boiler tube because material changes, the boiler heat-transfer hydraulic performance decline that the factor such as dust deposit in furnace and coking causes, make radiant energy level rising in stove under unit same load level, at this moment, adopt the real power signal of unit to calculate the quiescent value of radiant energy signal, effective radiant energy data divided by current time in for the previous period obtain the P factor, revise the radiant energy signal that current time gathers, just can guarantee when load is identical to revise radiant energy signal constant, too high estimation capacity of furnace level just can not occur, send the false command that reduces capacity of furnace supply (by fuel and wind).
The invention has the beneficial effects as follows: can eliminate the radiant energy signal static deviation that the runnability changing factors such as detector dust stratification, coking, null offset and collecting ash, coking are introduced, 0 radiant energy signal that reliability is strong, accurate, stable is provided, effectively the pulsating nature of reflection furnace flame, guarantee the continuous use of radiant energy control system.
The accompanying drawing explanation
Fig. 1 is a kind of flow chart of revising the method for radiant energy signal static deviation of the present invention;
The radiant energy signal figure that the detector that Fig. 2 is certain normal work collects.
Fig. 3 is unit real the send out power signal figure corresponding with Fig. 2.
The radiant energy signal figure that the detector that Fig. 4 is certain coking state collects.
Fig. 5 is unit real the send out power signal figure corresponding with Fig. 4.
The radiant energy signal figure that the detector that Fig. 6 is certain dust stratification state collects.
Fig. 7 is unit real the send out power signal figure corresponding with Fig. 5.
Fig. 8 is for revising previous irradiation energy signal graph.
Fig. 9 is the real power diagram of sending out of unit before the correction corresponding with Fig. 8.
Figure 10 is radiant energy signal figure after revising.
Figure 11 is the real power diagram of sending out of unit after the correction corresponding with Figure 10.
The specific embodiment
With reference now to accompanying drawing, describe implementation process of the present invention, the invention provides the radiant energy signal static deviation modification method of required stove internal combustion energy level under a kind of accurate reflection fossil-fired unit different load, its flow process as shown in Figure 1, the steps include:
At first drive the SDK2000 video frequency collection card to complete the collection of flame image, extract each pixel RGB colouring information.Then utilize R value size judgement detector coking state, utilize relative coefficient judgement detector dust stratification state, invalid detector signal is rejected, add up effective detector number and numbering, extract the radiant energy signal of effective detector and do the ratio correction.Finally the radiant energy signal of all effective detectors is averaged to rear filtering output.As Figure 2-3, be radiant energy signal and the real power signal graph of a relation of sending out of unit that certain normal detector of working collects, abscissa is the time, ordinate is respectively radiant energy data and the real power data of sending out.
1, the coking state of judgement detector
The principle of detector coking judgement is to judge according to the R value size of monitor area in image whether detector is subject to blocking of coking.The process of detector installation region coking is to centre by surrounding, therefore the process that image is blocked is also blackening in the middle of four jiaos of first blackening then, the besel that zonule based on this selected every width detector image middle part 10*10 is each detector, the number of adding up the inner available point of this besel is designated as CountPixel, to the validity of pixel according to formula:
Foreach R(1,100) > R
TH (1)
Judge.As long as the inner available point number of besel is greater than threshold values C
TH(be CountPixel>C
TH) time, according to formula:
R
ar=∑R(1,CountPixel)/ CountPixel，
G
ar =∑G(1, CountPixel)/ CountPixel，
B
ar =∑B(1,CountPixel)/CountPixel (2)
And formula:
G=0.3* R
ar+0.59*G
ar+0.11*B
ar (3)
Calculate rgb value and the radiant energy of this detectors, otherwise this detector is set to invalid.Effectively the status signal Eflag of detector is set to 1, and the status signal Eflag of invalid detector is set to 0, with the number of all effective detectors of Enumber statistics.
In formula (1), Foreach means 100 pixels are traveled through, and R means to travel through the R value that target is pixel, R
THMean the effective threshold values of pixel R value, by the analysis to historical data and to the consideration of the power of the assembling unit, get R here
TH=70.
In formula (3), G means the radiant energy signal that detector gathers.R
Ar, G
Ar, B
ArThe color value of representative image.Empirical tests, the radiant energy signal that adopts this formula to calculate can reflect the combustion intensity in furnace cavity in real time, compares traditional radiant energy signal computational methods, and the method is calculated simple, and reliability is higher.
As shown in Fig. 4-5, the radiant energy signal and the real power signal graph of a relation of sending out of unit that for the detector of certain coking state, collect, abscissa is the time, ordinate is respectively radiant energy data and a real power data.Mark 101 places are shown detector coking state.The inner available point number of its besel is less than threshold values, and it is invalid that this detector is set to, and after the detector coking, radiant energy signal reduces rapidly, and after coke button drops, it is normal that radiant energy signal recovers.
2, the dust stratification state of judgement detector
The foundation of detector dust stratification judgement is to judge according to radiant energy signal and the real relative coefficient D sent out between power signal of unit whether detector is subject to blocking of dust.When detector works, the real relative coefficient of sending out between power signal of the radiant energy signal of its collection and unit generally is greater than 0.75(and obtains according to historical data analysis), as shown in Fig. 2; When detector camera lens dust stratification, the radiant energy signal of its collection reduces gradually, and variation tendency and power signal start to occur difference, and both relative coefficients reduce gradually, and the relative coefficient D calculated when certain detector is less than threshold values D
THThe time, it is invalid that this detector is set to.
During relative coefficient calculates, length is 1 hour access time, current time is put to the service data of first 1 hour according to formula:
Foreach Eflag(1,T) = 1 CountHourGray++ (4)
Screened.In formula (4), the status signal that Eflag is each detector, when the detector's status signal is effective, this data point is effective, enters and revises data queue, and effective status point number CountHourGray adds 1.T, for revising the time scale of queue, is taken as 3600s by T here.After having screened, return to total number CountHourGray of significant instant point in this 3600s, and record each significant instant and put corresponding power signal P and radiant energy signal G.After having screened, according to formula:
P
ar =∑P(1, CountHourGray)/ CountHourGray
G
ar =∑G(1, CountHourGray)/ CountHourGray (5)
Calculate the power average value P in 1 hour
ArWith radiant energy signal mean value G
Ar.
The computing formula of relative coefficient is:
D=∑{(P - P
ar)*(G - G
ar)} / { [∑(P - P
ar)
2]
0.5*[∑(G - G
ar)
2]
0.5} (6)
, the absolute value of coefficient correlation generally thinks that strong correlation is arranged 0.8 when above, can think between 0.3 to 0.8 weak correlation is arranged, and thinks below 0.3 and there is no correlation so D
THValue 0.3.
As shown in Fig. 6-7, be radiant energy signal and the real power signal graph of a relation of sending out of unit that the detector of certain dust stratification state collects, abscissa is the time, ordinate is respectively radiant energy data and the real power data of sending out.Mark 102 places are shown detector dust stratification state.After the detector dust stratification, there are deviation in radiant energy signal and normal value, and the detector relative coefficient of gained as calculated is less than threshold values, and it is invalid that this detector is set to.
3, detector ratio correction
Because unit generation power signal and radiant energy signal have very strong correlation, utilize power signal to calculate the quiescent value of radiant energy signal, corresponding relation is: the radiant energy quiescent value of the corresponding 0-200 of the generated output of 0-600.Dynamic radiation energy modifying factor P computing formula:
P=(P
ar/3.0) / G
ar (7)。
4, radiant energy signal output
After completing the correction to each detector, the radiant energy signal of all effective detectors is averaged, uses formula:
G
out = ∑G(1,Enumber)/ Enumber (8)
Calculate.In formula (8), the number that Enumber is effective detector.G
outFor output radiation energy signal.
Because the pulsating nature of flame is very strong, the radiant energy data fluctuations is very large, further output radiation energy signal is done to weights filtering, gets 8 front data of current state point 8s and makes weighted average, uses formula:
G
out,LP = ∑G
out*W
out(1,T
g )/∑W
out(1,Tg ) (9)
Calculated.In formula (9), G
Out, LPFor output radiation energy signal after filtering, W
outFor each moment weights, T
gFor the filtering time, be taken as 8s here, the weights combination is taken as { 1,2,3,4,5,6,7,8}.As Figure 8-9, for revising the real contrast effect figure that sends out power signal of previous irradiation energy signal and unit; As shown in Figure 10-11, for revising the real contrast effect figure that sends out power signal of rear radiant energy signal and unit.Abscissa is the time, and Fig. 8,10 ordinates are radiant energy data before and after revising, and Fig. 9,11 ordinates are the real power data of sending out before and after revising.After revising, the static deviation that radiant energy signal exists is improved, and makeover process does not change the variability of radiant energy signal reflection stove internal combustion state.
Claims (4)
1. a method of revising the radiant energy signal static deviation is characterized in that: have following steps:
S100. drive video frequency collection card to complete the collection of flame image and extract each pixel RGB colouring information;
S200. utilize in above-mentioned image the valid pixel judgement detector coking state of counting out; Utilize relative coefficient judgement detector dust stratification state; Add up effective detector number and numbering, extract the radiant energy signal of effective detector and do the ratio correction;
S300. the radiant energy signal of all effective detectors is averaged to rear filtering output.
2. a kind of method of revising the radiant energy signal static deviation according to claim 1, it is characterized in that: the step of the judgement detector coking state described in step S200 is:
S201. selected detector image central region is as besel;
S202. add up the inner effective pixel points number of described besel;
S203. described effective pixel points number and reservation threshold are made comparisons, reach the effective detector of being made as of described reservation threshold.
3. a kind of method of revising the radiant energy signal static deviation according to claim 1, it is characterized in that: the real relative coefficient of sending out between power signal of the dust stratification of detector described in step S200 state basis for estimation radiant energy signal and unit, described detector when the relative coefficient of gained is less than reservation threshold as calculated this detector be set to invalid.
4. a kind of method of revising the radiant energy signal static deviation according to claim 1, it is characterized in that: the correction of ratio described in step S200 is according to the real correlation of sending out between power signal and radiant energy signal of unit, adopt the real power signal of described unit to calculate the quiescent value of described radiant energy signal, described quiescent value obtains scale factor divided by nearest available energy data.
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| CN116776266A (en) * | 2023-06-07 | 2023-09-19 | 郑州银丰电子科技有限公司 | Multi-target measurement and control based data processing system and method |
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