旋流式組合壓力噴霧干燥技術(shù)研究.pdf

1、中國農(nóng)業(yè)大學(xué)博士學(xué)位論文旋流式組合壓力噴霧干燥技術(shù)研究姓名：張忠杰申請學(xué)位級別：博士專業(yè)：農(nóng)產(chǎn)品加工及貯藏工程指導(dǎo)教師：毛志懷20030501AbstractThedriedpowderproductwasformedinthespraydryerbypressurenozzlewhichatomizedliquidintosmalldropletsandheatandmasstransferringwasperformedbetwee

2、ndropletsandhotmediuminthedryingchamberThistypeofdryerwasfitfulforliquiddryinginconcurrent，countercurrentormixedairflowThedryercanproducepowders，granules，hollowsphericalpaniclesandagglomeratesproductsThesprayingcapacitya

3、ndpaniclesizewerechangedbyalteringthepartsassembledinthenozzlePressurespraydryershavebeenwidelyusedinfoodstuifchemicalsmedicaments，buildingmaterials，environmentalprotection。etcAsoneofthemostenergyconsumption，itisquiteval

4、uabletostudyhowtomakethespraydryersaveenergyconsumption，enhancevolumetricevaporationintensitydecreaseitsenvironmentalpollutionandrunningcost，improveitsproduetivitythroughautomaticcontrollingsystemandcutdowntheinvestmento

5、nequipmentInthisdissertation，theauthorsummedupthemuti—techniqueinfluiddynamics，heatandmasstransferringmechanicaldesigningandcomputationaltechniqueandstudiedtheconventionalpressurespraydryerswithdifierentairdispersestruct

6、ureandoutletequipmentatlastputforwardthethemeie，thestudyoncombinedspin—flowpressurespraydryingtechnologythemaincontentswereasfollows：(1)Theeomblnedspinflowpressurenozzlewasdesignedwhosenovelstructurehasnoreportatpresem，a

7、ndthestructuraldesigningparameterswereobtainedthroughanalyzingthephysicalcharacteristicofmaterialsanddistributionofparticles(2)Baseontheanalysisoftheatomizingprinciplesofsprayno口le，mathematicalmodelofcombinedspin—flowpre

8、ssurespraydryingwassetupandtheessentialparameterssuchassprayingpressure，liquidquantitytemperature，sprayingangle，injectdistance，particlediameteranddistribution，hollowdiameterforseveralmaterialsinnormalconditionsbyexperime

9、ntandLDVThekeyitemsinfluentonthecharacteristicsofsprayinghavebeenalsostudiedinthedissertation，weCaBgetagoodsprayingresultbyadjustingtherelatedparametersefficiently(3)Thetheoreticalmodelofthedynamicalparameterssuchastempe

10、rature，moisture，pressureandcontourforhotmediumandparticleinsidethedryingchamberwereobtainedbyK一￡model，utilizedtheComputationalFluidDynamicstechniquetosolvetheproblembetweensprayingdropletsmediumbyarrangingthedoublegriddi

11、spersingstructureandrotaryoutletstructureandthedevelopedstructureimprovedthedryingefficiencyandproductquality(4)Thedropletsdiameterofthecombinedspinflowpressurespraydryingarebetween30urnand150urnandtherangesofthedroplets

12、areaalTOWTheaveragediameterofthedropletsisbetween50u／nand100Ⅲandthesprayinganglecanbeadjustedfrom30。to1800Thedehydrationtimeissquareofthedropletsdiametersothesmalldiametersofthedropletscancutdownthedryingtimethenreduceth

13、eheightofthedryingchamberTothecombinedspinflowpressurespraydrying，thediametersofdropletsaresmallandthedehydrationrateishighersokeepingthequalitiesofthedriedproductswecanincreasethespeedoftheinletwindandreducethetemperatu