基于聲波理論的爐膛溫度場在線監(jiān)測技術(shù)研究.pdf

1、華北電力大學(xué)（北京）博士學(xué)位論文基于聲波理論的爐膛溫度場在線監(jiān)測技術(shù)研究姓名：沈國清申請學(xué)位級別：博士專業(yè)：熱能工程指導(dǎo)教師：安連鎖20070401摘要AbstraCtInlargecoalfiredpowerpl柚t，tooperatesafely觚ldefficiemly，tolowerpollution，atldtorealizetheessenceofthecombustion，medistributionandvisualiz

2、ationofthemmacetemperatu∞fieldisimpoftantinpracticalvaluealldsciemificmeaningHowever，theprocessingofcombustioninpowerplalltfIlmaceisinstantaneous，randomandinhardenvironment，aIldthescaleOf如maceislargeAtpresent，thefeisnot鋤

3、ef如ctivemonitoringmeaSurememonmmacetemperatIlrcfieldh囂beenestablishedBasedonacousticmeory，therealtimemoIlitoringtechniqueonfumacetemperaturefieldbyacousticmethodhasbeenproposedFunhertheory鋤dexperimentstl|dyhasbeendevelop

4、edItofferstheOryaIldtechniqueinstructiontOengineeringapplicationThewaveequationandspeedequationofsoundpropagationinfhmacea∞deductedThemodelbetweensoundspeedandmediatemperatureisestablishedAccordingtoFe瑚at’stheoryarIdvari

5、ationaIcalculation，themathematicalmOdelofsoundp8thindissymmetricaltemperaturefieIdisestablishedFurthermorc。thesoundpathequationissolvedThepOssiblemeasllrememerrorinacousticpyrometryis觚alyzedBytheanalysisofsoundfieldinfum

6、ace，tllereisstandingwavefieldwhenthewaveisoflowfrequency’andthefeisdif!fhsionfieldwhenthewaveisOfhighfrequencyThecriticalfkquencyisSchroedefFrequcncyBasedontwochannelmeasufementmodel，thetimedelayestimationalgorit№basedon

7、crosscorrelationisgivenMoreaccurateresultcanbegottenbyfilteredinfrequencyfieldTherightstatisticanalysismethodshouldbeselected鋤OngthediffbremtypeofsignalandnoiseThetimedelayestimationbasedonhi曲ordercumulantisgivenTheacqui

8、redbackgroundnoisein丘lmaceisaddedtosignalwithexD0nentialdistribution0nehundredMonteCarlosimulationtestsOfTDE甜edonebasedontheMLcrosscorrclationmethodandhi吐ordefcumulantmethodrespectiveIyunderdif艷rentsignalnoiseratio(SNR)T

9、hercsultshowsth砒theinnuenceofcorrelatedOaussiannoisecanberestfainedf曲mthenonGaussiansignalbasedonthethirdordercumulantmethodevenunderpoorSNRAimedatreverberationthatcouldbeappearedinfumace，thecepstrummethod鋤denvelopeanaly

10、sisisgivenThereconstmctionalgorithmoftemperaturefieIdbasedonseriesexpansionisgiVenThelinearequationofwei曲tsmatrix，imagematrix，andprojectionmatrixisestablishedAimedattheinverseproblemmodeloftemperatufefieldreconstmction，t

11、healgebmicreconstructionequationisgivenRegularizationofthei11posedproblemhasbeendoneThereconstructionsofsOmetypicalnamedistributioninfumacearesimulatedbycomputerThealgorithmcanof孢raccuratetemperatureatanyspotofthefumacec

12、rosssectiOnSomerandomnoiseisaddedtotllesimulatedmeasurementdata，andtheresultshowthatthealgorithmisrobustAimedatthetypicalsymmetricaltemperaturedist“butioninfurnace，thealgorithmbyprcsumedasinglepathtemperaturefunctionnrst