烟气排放实时连续监测系统关键技术的研究

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1、天津大学博士学位论文烟气排放实时连续监测系统关键技术的研究姓名：李树珉申请学位级别：博士专业：测试计量技术及仪器指导教师：孙长库20090701ABSTRACTAirpollutionmonitoringandcontrollingissuesaregivenmoreandmoreattentioninvariouscountriesaroundtheworld．Therearetwomainreasonsforairpollution：First,thecoalburningboileremissions，liked

2、ust，sulfurdioxideandnitrogenoxides；theotheristhemotorvehicleemissions．Andthevarioustypesofcombustion,suchasthefluegasemissionsofindustrialandcommercialboilers，causetheseriousairpollutionproblem．Inthiscase，thefluegasmonitoringisallimportantaspectofenvironmentalpr

3、otection．Onthebasisofultravioletdifferencespectrummeasurenlent，thekeytechnologiesoffluegasemissionsmeasurementtechnologyforreal—timemonitoringsystemareanalyzedintheaspectsofthetheoreticalandexperimentalresearch．Themaincontentandinnovationpointsareasfollows：1．The

4、theoreticalmodelofL撕bert．BeerLawiss缸diedint如actualmeasurementcondition．WhenthelightemittedfromtheSOUl℃etransmittingthroughthefluegas，theattenuationcausedbyRayleighscatteringandMiescatteringislargerthanthatofmolecularabsorptioninthetotalcontribution．Theseeffectsw

5、illbeconsideredtojointherelativemeasurementmodeltoimprovetheaccuracyoftheoreticalcalculation．2．IncomparisonwiththeopticalstructureofthecurrentmeasurementprobeofS02andNOxgasconcentration,anewsingleplug-indouble—sidedprobeisdesignedtoreducethehightemperaturedeform

6、ationoftheprobe，whichCandisturbthelightpath．Thisdesignmakesthefieldmountedandfixedmoreconvenient，whichalsoincreasesthestabilityofthesystem．}!‘：3．Forthenonlinearityofpracticalconditioncausesdeviationfromtheoreticallaw,anewcalibrationmethodisintroduced．Thismethodt

7、ransfersthechangeingaslengthtothechangeingasconcentration．Thehigh-precisionprobecalibrationisrealizedbythismethod．AnumberofprooftestsofS02andNOaretakenwiththecalibratedprobe．Theaverageconcentrationdeviationislessthan2％．4．Thespectrumself-adaptingalgorithmispresen

8、ted．Theimpactoffluedusttothereceivedlightissolvedbyadjustingtheintegrationtimeautomatically．Andthelifelengthofthesourceisincreased．Thedriftofthespectrumiscorrectedbya