丙酮丁醇发酵尾气在线监测系统的设计-控制理论与控制工程专业毕业论文

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1、丙酮丁醇发酵尾气在线监测系统的设计DesignofAnOnlineOff-gasMonitoringSystemforAcetone—Butanol-Ethanol(ABE)FermentationAbstractAmicrobialfermentationprocessbelongstoacellmetabolicprocesswithmaterialconversion．Toenhancetheconversionratiotothetargetproduct，it’Snecessarytohaveareal·timeanalysisonthedynamiccharact

2、eristicsofamicrobialfermentationprocess，SOastooptimizethefermentationprocessinrealtime．Alotoffermentationprocessesdischargealargeamountofoff-gas．Thecomponent，volumeandproductionrateofoff-gasreflectinmacro．scalethematerialtransformationruleinsidethemicrobes．Inthisthesis，theacetone-butanol-et

3、hanol(ABE)fermentationprocessisstudiedandcorrespondingly，onlineoff-gasmonitoringsystemisdesignedforanaerobicfermentation．TheestablishedsystemCananalyzethecomponentsofoff-gasinrealtime，anddisplaythereal-timeresultswithahistoricalrecordthememory．BystudyingontheprincipleofABEfermentation，itisr

4、ecognizedthatthefermentationprocessconsistoftwophases，namely，acidogensisandsolventogensis．Attheinitialphaseofacidogensis，acidiccompoundslikeacetateandbutyrateareproducedandthepHvalueofthemediumdropsdownrapidly，whileoff-gasofC02andH2aredischarged．Whenthephaseofsolventogensiscomesup，thechrote

5、ridiumacetobutylicumconsumesacetateandbutyratetoturnoutacetone，butanolandethanol，whileC02andHEarealsoproduced．Thisindicatedsthatthematerialtransformationprocessinmicro—scaleviacellsisreflectedbythevariationonthecomponentsofthemediumandoff-gasinmacro-scale．DuetothatABEfermentationrequiresari

6、gorousanaerobicenvironment，aprimaryproblemtobesolvedformonitoringthefermentationprocessistoensuretheanaerobicenvironmentagainstexternaldisturbance．Anentirelyclosedmonitoringmethodisproposedinthisthesis，basedontestingdifferentconnectionbetweenananaerobicbioreactorandgasanalyzer．Thatis，aconic

7、alflaskisusedtoisolatethebioreactorandtheexternalenvironment，suchthatacyclicmeasurementcircuitisconstructedbetweentheconicalflaskandthegasanalyzer．Inthisway，thefermentationenvironmentCanbeeffectivelyprotectedfromextemaldisturbance，suchthatthereal-timevar