微波真空冷凍干燥的工藝及設(shè)備問題（MICROWAVEVACUUMFREEZEDRYINGPROCESSANDEQUIPMENTPROBLEMS）PDFDOCUMENTSMAYEXPERIENCEPOORBROWSINGONTHEWAPSIDEITISRECOMMENDEDTHATYOUFIRSTSELECTTXT,ORDOWNLOADTHESOURCEFILETOTHELOCALVIEWVIPINFORMATIONHTTP/WWWCQVIPCOMHOE000ONEHEIRGOODSTECHNOLOGYJIMICROWAVEVACUUMFREEZEDRYINGPROCESSANDEQUIPMENTPROBLEMSDONGTIEYOU,LISUYUN,ZHANGJIANLONGZHUWENXUESCHOOLOFFOODANDBIOLOGICALENGINEERING,HENANUNIVERSITYOFSCIENCEANDTECHNOLOGY,LUOYANG410,CHINA703ABSTRACTTHEPROBLEMSOFDRYINGUNEVENNESS,DRYINGRATEANDMICROWAVELEAKAGEINMICROWAVEVACUUMFREEZEDRYINGAREMAINLYANALYZED,THEPROBLEMOFINSUFFICIENTCOOLINGCAPACITY,THEVACUUMCAPACITYOFVACUUMSYSTEMANDTHESAFETYOPERATIONOFTHEWHOLESYSTEMAREDISCUSSEDITALSOPUTSFORWARDSOMEBASICTECHNIQUES,METHODSANDMEANSTOSOLVETHEPROBLEMS,SUCHASCORRESPONDINGDESIGN,PROCESS,REASONABLEOPERATIONRULES,ANDSOONMICROWAVEVACUUMFREEZEDRYINGTECHNOLOGYANDEQUIPMENTAREPROVIDEDKEYWORDSMICROWAVEVACUUMFREEZEDRYINGEQUIPMENTCLCNUMBERT257S0DOCUMENTIDENTIFIERCARTICLENUMBER10992000430598410300SOEHIANQUPMETCNCLDEIMETPOLMSANRBEICOVAUMREEDYNYTMNMIRWAEVCUFEZRIGSSEIONGEYU,LISUTIOUYN,ZHANGINLNJAOG,ZHUEUWNXEOLGFFONIEGNEIHEAIESYOCLEOODADBONIERG,NNUNRIENVTFSINEADTCNLYLOAG410CECNEHOO,UYN73G0ABTATSRCSOHORT,TCNCLDEUPNRBEFVCUFEERIGWICOVETGMETEEIEHIACANQIMETPOLMSOAUMRZDYNTMIRWAEHAIEHNSSEECUTRDDRGTERLTEECRNYEYTMNONEEUIHEAERSARHAEAALZDANHYORSLETEEPOLRNDDTEWASTEOVHSRBEMSWEEPTOWARHRFREIFRTNCEAPIDIRVNNPIZNHCOVAUMRZURDTEEOETOMAIANBPLIOIGADOTIGTEMIRWAEVCUFEEFHNOENMPMIDRIGSSEYNYTMKERSYWODMIRWAEVCUFEZRIGEUPETCOV一個(gè)動(dòng)詞是一個(gè)動(dòng)詞。0前言農(nóng)產(chǎn)品的附加值等。因而在高檔食品、保健功能性食品和農(nóng)產(chǎn)品加工業(yè)中具有廣闊的用武之地。但是由于該工藝所需的設(shè)備是技術(shù)含量很高的高技術(shù)產(chǎn)品，所以設(shè)備投資較大。另外與微波真空冷凍干燥工藝密切相關(guān)的不同的食品物料的理化特性參數(shù)和工藝參數(shù)還很不齊全，相關(guān)的設(shè)備和理論研究還不是很成熟，所以限制了該技術(shù)在我國食品工業(yè)中的應(yīng)用微波真空冷凍干燥技術(shù)將有助于延長食品的保質(zhì)期、保持食品原有的風(fēng)味和營養(yǎng)成分以及食品原料的生理活性、增強(qiáng)保健食品的功能性、提高收稿日期204204O3基金項(xiàng)目河南省自然科學(xué)研究基金項(xiàng)目（10200600）育；教21部及河南省人事廳留學(xué)回國人員資助項(xiàng)目；河南省教育廳創(chuàng)新人才基金項(xiàng)目應(yīng)用的毫無疑問，這些問題的解決將會(huì)有力地推動(dòng)微波真空冷凍干燥技術(shù)在我國的應(yīng)用和推廣。本研究以已有的一臺(tái)微波真空冷凍干燥實(shí)驗(yàn)裝置為基礎(chǔ)，對(duì)微波真空冷凍干燥裝置的結(jié)構(gòu)和使用作者簡介董鐵有（6一，男，副教授，博士，研究方向農(nóng)10）9產(chǎn)品加工及儲(chǔ)藏維普資訊HTTP/WWWCQVIPCOM，二J一愛品技J我RTJ問題以及微波真空冷凍干燥工藝問題進(jìn)行探討。1微波真空冷凍干燥的特點(diǎn)在干燥過程中物料吸收微波能的多少主要取決于物料的介質(zhì)損耗因數(shù)。不同物料的介質(zhì)損耗因數(shù)是不同的。水的介質(zhì)損耗因數(shù)比一般的食品物料中的干物質(zhì)的介質(zhì)損耗因數(shù)大1倍左右021以在干燥初始。所階段，水分蒸發(fā)較快，當(dāng)干燥快結(jié)束時(shí)，所吸收的能微波真空冷凍干燥是將高效的微波輻射加熱技術(shù)和真空冷凍干燥技術(shù)相結(jié)合的極具有應(yīng)用價(jià)值的一項(xiàng)新技術(shù)。微波真空冷凍干燥就是利用微波輻射量也隨著下降。且不會(huì)集中在已干部分可以避免。已干物質(zhì)的過熱。所以微波加熱具有自動(dòng)平衡能量處于凍結(jié)狀態(tài)的被干燥物料，在高頻交變電磁的作用下使物料（是水）子發(fā)生振動(dòng)和相互磨擦從而主要分將電磁能轉(zhuǎn)化為物料中的水分升華所需要的升華潛熱。微波真空冷凍干燥除了具有普通的真空冷凍干燥所具有的優(yōu)點(diǎn)外，還具有其它特殊的優(yōu)勢(shì)干燥速度快。1。1微波是指頻率在00GZ長在LL），30小時(shí)（3波XO3MTM我分配的作用。1微波加熱響應(yīng)快易于控制3。THEHEATOFACONVENTIONALHEATING,SUCHASELECTRICHEATING,STEAM,ORHOTAIRHEATINGGREATERINERTIAASTOCERTAINTEMPERATURETHEREMUSTBEALONGERWARMUPTIMEONTHEOTHERHAND,IFHEATISNOTNEEDEDSTOPADDINGTHERMALTIMEBECAUSEOFTHEHEATCAPACITYOFTHEHEATSOURCEEQUIPMENTITSELFNORISTHEHEATSOURCETEMPERATUREELECTROMAGNETICWAVESINTHERANGETHETRANSMISSIONCHARACTERISTICOFMICROWAVELIESINTHEOBSTACLEREFLECTION,TRANSMISSION,ANDABSORPTIONOFASUBSTANCEIRRADIATEDORHEATEDWILLCOMEDOWNATONCEMICROWAVEHEATINGCANBEACHIEVEDBYOPENINGBOTHHEAT,THATIS,YOUCANSTOPHEATING,CONTROL,REGULATIONISVERYCONVENIENT2PROBLEMSANDCOUNTERMEASURESOFMICROWAVEVACUUMFREEZEDRYINGTECHNOLOGY21THEORETICALQUESTIONSELEPHANTTHESTRENGTHOFTHESEPHENOMENAISRELATEDTOTHENATUREOFTHEMATTERITSELFPOSITIVEIBECAUSEOFTHETRANSMISSIONOFMICROWAVEMICROWAVECANPENETRATEDIRECTLYMATERIALREALIZETHEBALANCEDHEATINGINSIDEANDOUTSIDEUNLIKETRADITIONALVACUUMDRYINGTHESAMPLEPASSESTHEHEATTOTHETRAYTHROUGHTHEHEATINGELEMENTANDPASSESTOTHETRAYHEATEDMATERIALMICROWAVEHEATINGCANGREATLYSHORTENHEATINGTIMEMICROWAVEVACUUMFREEZEDRYINGISASETOFMICROWAVETECHNOLOGY,VACUUMTECHNOLOGY,CRYOGENICTECHNOLOGY,MICROBIOLOGY,FLUIDMECHANICS,HEATANDMASSTRANSFERANDAUTOMATICCONTROLTECHNOLOGYTOHIGHTECHNOLOGYDEVELOPMENTITISAPRODUCTOFINTERDISCIPLINARYDEVELOPMENT,FIITISINTHEDRYINGPROCESSOFMATERIALPHYSICALCHANGE,HEATANDMASSANEWTECHNOLOGYANDPROCESSDEVELOPEDONTHEBASISOFTHOROUGHRESEARCHONTHEPROCESSOFWATERTRANSFERUNDEREXCHANGEANDVACUUMCONDITIONSINRECENTYEARS,INMICROWAVETHEDRYINGRATEANDTHERMALEFFICIENCYARE42TIMESTHATOFTHECONVENTIONALHEATINGMETHOD0THEPENETRATINGPOWEROFMICROWAVECANBEEXPRESSEDBYPENETRATIONDEPTHHSOCALLEDPENETRATIONDEPTHREFERSTOTHEATTENUATIONOFTHEINCIDENTENERGYTO1ITSVALUECANBECALCULATEDBYPRESSINGTYPE/ETTYPEWAVELENGTHMTHETHEORYOFENERGYDISTRIBUTIONINDRYINGANDDRYINGROOMS,VACUUMANDLOWPRESSURECONDITIONSINTHEMICROWAVEFIELD,THEPROBLEMOFCORONAARCDISCHARGE,THEHEATINGTEMPERATUREDIFFERENCEBETWEENTHELAYERS,THENONCONTACTTEMPERATUREMEASUREMENTINTHEMICROWAVEFIELDANDTHEFREEZEDRYINGINTHEVACUUMAREDISCUSSEDSRELATIVEDIELECTRICCONSTANTTADIELECTRICLOSSANGLEFACTORTHEANALYSISOFHEATANDMASSTRANSFERANDTHEESTABLISHMENTOFMATHEMATICALMODELINDRYINGPROCESSTHERESEARCHHASMADEGRATIFYINGACHIEVEMENTSBUTT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