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SUPERHEATEDSTEAMflUIDISEDBEDPADDYDRYINGCHAIYONGTAECHAPAIROJA,,ISARESDHUCHAKALLAYAA,SOMCHARTSOPONRONNARITA,SOMBOONWETCHACAMAA,SOMKIATPRACHAYAWARAKORNBATHERMALTECHNOLOGYDIVISION,SCHOOLOFENERGYANDMATERIALS,KINGMONGKUT’SUNIVERSITYOFTECHNOLOGYTHONBURI,SUKSAWAT48ROAD,THUNGKARU,BANGKOK10140,THAILANDBFACULTYOFENGINEERING,KINGMONGKUT’SUNIVERSITYOFTECHNOLOGYTHONBURI,SUKSAWAT48ROAD,THUNGKARU,BANGKOK10140,THAILANDRECEIVED18FEBRUARY2002;ACCEPTED24JULY2002ABSTRACTFLUIDISEDBEDPADDYDRYINGUSINGSUPERHEATEDSTEAMISANEWLYALTERNATIVEAPPROACHINSTEADOFUSINGTHECONVENTIONALHOTAIRTHEMECHANISMOFMASSTRANSFERFORPADDYDRYINGINARANGEOFINITIALMOISTURECONTENTBETWEEN25AND445DBISSTRONGLYCONTROLLEDBYINTERNALMOISTUREMOVEMENTINSIDETHEKERNELANDATWOSERIESEXPONENTIALEQUATIONISSUITABLYUSEDTOEXPLAINITSMOVEMENTDRYINGPARAMETERSINTHEEQUATIONAREAFUNCTIONOFTEMPERATUREANDBEDDEPTHFORTHEPADDYQUALITY,HEADRICEYIELDFROMTHESUPERHEATEDSTEAMDRYINGISMORESUSTAINABLEANDHASHIGHERVALUESTHANTHOSEOBTAINEDFROMTHEHOTAIRDRYING,WHEREASTHECOLOUROFWHITERICEBECOMESDARKER,MAKINGITPOORERQUALITYTHEPERCENTAGEOFWHITEBELLYISSIGNIfiCANTLYAffECTEDBYTHEINITIALMOISTURECONTENTC2112002ELSEVIERSCIENCELTDALLRIGHTSRESERVEDKEYWORDSDEHYDRATION;GRAIN;HEADRICE;QUALITY;SUPERHEATEDSTEAM;WHITEBELLY1INTRODUCTIONPADDYISANIMPORTANTFOODCROPINTHEWORLDTHISCEREALISPROCESSEDINTOSEVERALPRODUCTS,INADDITIONTOASTAPLEFOODBEFOREBEINGPROCESSED,FRESHLYHARVESTEDPADDYNEEDSTOBEDRIEDINORDERTOAVOIDTHEQUALITYDETERIORATIONBYMICROORGANISMSANDRESPIRATIONADRYINGMETHODWHICHISUTILISEDEffECTIVELYFORESSENTIALLYHIGHMOISTUREGRAINS,FOREXAMPLE,PADDY,PARBOILEDRICE,SOYBEANANDMAIZE,ISAflUIDISATIONTECHNIQUE,INWHICHAIRANDSOLIDPARTICLESARERIGOROUSLYMIXEDITHASBEENSUGGESTEDTHATHIGHMOISTUREPADDYSHOULDBEDRIEDQUICKLYTOAPPROXIMATE23DBTOPREVENTTHEYELLOWINGOFRICEKERNELSWHICHISEASILYOCCURREDATHIGHMOISTURELEVELANDTHENSUBJECTEDTOAMBIENTAIRDRYINGINASTORAGEBINUNTILITSMOISTURECONTENTISDOWNTO16DBSOPONRONNARITPRACHAYAWARAKORN,1994SUTHERLANDANDGHALY1990UNDERTOOKANINTENSIVEINVESTIGATIONINTOTHEFEASIBILITYOFUSINGAHOTAIRflUIDISEDBEDDRYINGTECHNIQUEFORPADDYTHEIREXPERIMENTSSHOWEDTHATTHEHEADRICEYIELDRELATEDTOTHEfiNALMOISTURECONTENTTHEHEADRICEYIELDWAS58–61WHENPADDYWASDRIEDFROM282TO205DBBUTWAS15–24FORAfiNALMOISTURECONTENTLOWERTHAN20DBTHEDRYINGMEDIUMWHICHISUSEDFORCARRYINGTHEEVAPORATEDWATERANDflUIDISINGSOLIDPARTICLESCOULDBEHOTAIRORSUPERHEATEDSTEAMSUPERHEATEDSTEAMDRYINGOffERSIMPORTANTADVANTAGESOVERHOTAIRDRYINGITHEENERGYSUPPLIEDTOTHEDRYERCANBEREDUCEDECONOMICALLYBYRECYCLINGTHEEXHAUSTSTEAMINACLOSEDLOOP,IITHEENERGYFROMTHEEXHAUSTSTEAMRESULTINGFROMTHEEVAPORATIONOFMOISTUREINSIDETHESOLIDSCANBERECOVEREDANDUSEDINTHEOTHERSECTIONS,IIIENVIRONMENTALPOLLUTIONORODOUREMISSIONTOTHEATMOSPHERECANBEELIMINATEDSINCEDRYINGOCCURSINACLOSEDCHAMBERWITHOUTAIRTHEGENERALCHARACTERISTICSOFTHEDRYINGPROCESSCHANGESIGNIfiCANTLYWHENSUPERHEATEDSTEAMISUSEDINSTEADOFHOTAIRTHEMAJORDIffERENCESINCLUDEISTEAMCONDENSATIONATTHEMATERIALSURFACEDURINGTHEINITIALDRYINGPERIOD,IIHIGHERDRYINGRATEINSUPERHEATEDSTEAMTHANINHOTAIRATABOVEINVERSIONTEMPERATURE,THETEMPERATUREATWHICHTHEEVAPORATIONRATEOFWATERINTOSTEAMANDHOTAIRBECOMESEQUALYOSHIDAHYODO,1963,IIINOGASfiLMRESISTANCEAROUNDTHESOLIDSURFACETHEREBYINCREASINGTHEMASSTRANSFERRATEJOURNALOFFOODENGINEERING58200367–73WWWELSEVIERCOM/LOCATE/JFOODENGCORRESPONDINGAUTHORTEL/FAX6624708663EMAILADDRESSCHAIYONG_TYAHOOCOMCTAECHAPAIROJ02608774/02/SEEFRONTMATTERC2112002ELSEVIERSCIENCELTDALLRIGHTSRESERVEDPIIS0260877402003357THEUSEOFAHIGHSTEAMTEMPERATUREMAYCAUSEASERIOUSPROBLEMFORTHERMALLYSENSITIVEFOODMATERIALS,SUCHASBROWNING,DISCOLOURATIONANDPROTEINDENATURATIONINSOMECASES,HOWEVER,ITCHANGESTHETEXTURALPROPERTYBENEfiCIALLY;FOREXAMPLE,SHRIMPDRYINGWITHSUPERHEATEDSTEAMPRESENTEDALOWERDEGREEOFSHRINKAGETHANTHATUSINGHOTAIRPRACHAYAWARAKORN,SOPONRONNARIT,JAISUT,2002THEPURPOSEOFTHEPRESENTWORKWASTOMAKETHEPARBOILEDRICEBYASUPERHEATEDSTEAMflUIDISEDBEDDRYERTHEDRYINGCHARACTERISTICSOFPADDYWEREINVESTIGATED,ALONGWITHTHEQUALITIESINTERMSOFHEADRICEYIELD,WHITENESSANDWHITEBELLYTOBEDETERMINED2MATERIALANDMETHODSABATCHSUPERHEATEDSTEAMflUIDISEDBEDDRYERISSCHEMATICALLYILLUSTRATEDINFIG1ITCONSISTEDOFfiVEMAINCOMPONENTSACYLINDRICALCHAMBERWITHANINNERDIAMETEROF15CMANDAHEIGHTOF100CM,A135KWELECTRICALHEATERFORCONVERTINGSATURATEDSTEAMTOSUPERHEATEDSTEAM,ABACKWARDCURVEDBLADECENTRIFUGALFANDRIVENBYA22KWMOTOR,AREVERSEflOWCYCLONEANDASMALLBOILERWITHA31KG/HCAPACITYOFGENERATINGSTEAMAPERFORATEDSHEET,WITH10HOLESPERCM2,WASUSEDFORDISTRIBUTINGTHEDRYINGMEDIUMTHERATIOOFTHEDIAMETEROFDRYERTOGRAINDIAMETERDESIGNEDWASLARGEENOUGHTOMINIMISETHEWALLEffECTHOWEVER,THEWALLEffECTBECOMESIMPORTANTWHENTHERATIOISLOWERTHAN10GEANKOPLIS,1995SUPERHEATEDSTEAMTEMPERATUREWASCONTROLLEDBYAPIDCONTROLLERWITHANACCURACYOFC61C176CBEFOREUSINGSTEAMFORDRYING,HOTAIRWASUSEDFORWARMINGUPTHESYSTEMUNTILTHETEMPERATUREINEVERYPARTREACHEDTHEDESIREDLEVELTHEN,THEAIRWASREPLACEDBYSTEAMTHESTEAMGENERATORGENERATEDTHESATURATEDSTEAMAT106KPAABSOLUTEPRESSUREWITHTHECORRESPONDINGTEMPERATUREOF100C176CWHENTHESATURATEDSTEAMWASflOWEDTHROUGHTHEELECTRICALHEATER,ADDITIONALHEATWASSUPPLIEDTORAISETHESTEAMTEMPERATUREUPTOTHE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