噴動流化床流體動力學特性及放大規(guī)律研究.pdf

1、東南大學博士學位論文噴動流化床流體動力學特性及放大規(guī)律研究姓名：鐘文琪申請學位級別：博士專業(yè)：熱能工程指導教師：章名耀袁竹林20070305Abs“actAbstractSpoutflUidbedisanessentialtechnologyforcoalgas幣cation，whichcanalsobeappliedtogranulationcoatmgdwingsynchronousremovingofcoalbumedcontam

2、inationresourcadutilizationofbiorcassbycombusgonandgesificalfonC02CaptureandetcStudiesonthebasletheoryandthebesfcgassolidflowbehavioraofspoutfluidbedshavebeenperformHowevertherehasbeenlitttemformabonconcerningtheratherco

3、mplexflowcharactenetics們farDuetotheIackingoffulllcf竹wIedge∞thecomplexflowcharactensbcs，therehasbeensomedifficultyinscalingdesignandconfigurationopbngzattanThepresentworkisdevotedtevealingcomplexgassolidflowcharaetenslica

4、andscalingrelationshipsbyexperimentalandsimulatedapproachesSmallandscalingsizesofmultifunetionspoutfluidbedexperimentalsystemswereestablishedBasedontheexperiments，thecomplexgassolidflowcharacteestlcsandtherelationshipsof

5、geometricalparameterandopsmtingparameterhavebeenrevealedDistinctflowpattemswereidenUfiedandcriteriaaswell勰typicalflowpatternJmagaswerepresentedfordassl～ingtheflowpatternsTypicalflowpattammapswereplottedfordescribingthe”a

6、nsltionsbetweenflowpattemswithoperatingccrlditionsTwolundsofflowinstabllitiasandinstantaneous打ansruonofflowpattemsf舢stableflowtotnstableflowwereobservedBasedOntheHelmholtzlawofminimumenergyexhaustionthemechanismofflowins

7、tabilitieshasbeenbroughtforwardTherelationsofimportanthydrokinettasparameterssuchaspressuredropm刪mumspouting／spoUtofluidizinggasvelocitymaximumspoutablebedheightandjetpenetrationdepthtothegeometricalparametersandoperatin

8、gparameterswerepresentedNewcowelagonswerealsodevelopedBesidesmodemARMpowerspectrumandSHANNONentropywereusedtostudythegassolidflowcharacteristicsTherelationshipwithgassolidflowbehaviorsespec=allyflowpattemshasbeenestablis

9、hedSteadystatetracargasmeasurementwascamedouttoetudythegasmi，【inginthespoutandaenularregionbysimultaneouslyinjectingtwodifferenttracergasesThemechanismofgasmixingwasdiscussedandanewsubareagasmimngmodelwasdevelopedbyusing

10、thelawsofheatVansferandmass婦nsferforreferenceTheretationshlpofgasmJxmgwithflowpattemshasbeenrevealedintheaspectofmassexchangeBesides，ParlidemixingbehaviorswereexperimentalandnumericalstudiedPamdetracertechnologywaspedorm

11、edforexpenmentsandtheEulerianmulbphasemodelcombinedwmdiscreteparticlemodelwasusedforsimulationSoftsphereDEMmode／andcalculatedprogramhavebeensigmflcantlyimprovedwh=chsolvesthedifficunyinsimulationofparbcleclrcolationsande

12、nValnmentsinthecolumnwi蟣canebaseandletflowBasedontheDEMsimulation，theinformationofparticlecollisionsforcesachngonparticlesgasandparbcleturbulentintensitieswereobtainedAdditionallyEulerianmumphasumodelwlmclosurelawaccordi

13、ngtothekinebctheoryofgranularflowhavebeenimprovedThemethodforthedeterminabonofthecoe仟iclentofrestitabonderivedfromexpenmentaldatewaspmpoeadandCardedoutAddtheenergyequabonswereaddedtotakeintoaccountthethemlalconducbenwith

14、intheDhas髓BasedollthemodifiedEulehanmultlphasemodelwthdosuretawaccordingtothekineticrhearyofgranularflowtheScalingrelationshipsofspoutfluidbedswereinvestigatedDeterminingprincipleofscalingparamet日andresearchmethodofscali

15、nglawofspoutfluidbedwereputforward，ThegassutidflowcharaetensbcaofspsutfluidbedunderdifferentgeometricalparametersandoperatingparameterswereobtainedBasedonthecomparisionsofsimulatedflowpatternspressuredrop，jetbenetragonde

16、pthgasvelocityparticlevelocriyandmodifiedFmudenumbertheeffectsofgenmetncalparametersandoperatingparametersonthescalingrelationshipsofspoutfluidbedshavebeenrevealed，Besides，nowscalingmethodandequipmentofspoutfluidbedcoalg