簡介
隧道干燥機(jī)是一種利用熱能降低物料水分的機(jī)械設(shè)備，用于對物體進(jìn)行干燥操作。干燥機(jī)通過加熱使物料中的濕分（一般指水分或其他可揮發(fā)性液體成分）汽化逸出，以獲得規(guī)定濕含量的固體物料。干燥的目的是為了物料使用或進(jìn)一步加工的需要。
1原理
干燥過程需要消耗大量熱能，為了節(jié)省能量，某些濕含量高的物料、含有固體物質(zhì)的懸浮液或溶液一般先經(jīng)機(jī)械脫水或加熱蒸發(fā)，再在干燥機(jī)內(nèi)干燥，以得到干的固體。
在干燥過程中需要同時完成熱量和質(zhì)量（濕分）的傳遞，保證物料表面濕分蒸汽分壓（濃度）高于外部空間中的濕分蒸汽分壓，保證熱源溫度高于物料溫度。
熱量從高溫?zé)嵩匆愿鞣N方式傳遞給濕物料，使物料表面濕分汽化并逸散到外部空間，從而在物料表面和內(nèi)部出現(xiàn)濕含量的差別。內(nèi)部濕分向表面擴(kuò)散并汽化，使物料濕含量不斷降低，逐步完成物料整體的干燥。
物料的干燥速率取決于表面汽化速率和內(nèi)部濕分的擴(kuò)散速率。通常干燥前期的干燥速率受表面汽化速率控制；而后，只要干燥的外部條件不變，物料的干燥速率和表面溫度即保持穩(wěn)定，這個階段稱為恒速干燥階段；當(dāng)物料濕含量降低到某一程度，內(nèi)部濕分向表面的擴(kuò)散速率降低，并小于表面汽化速率時，干燥速率即主要由內(nèi)部擴(kuò)散速率決定，并隨濕含量的降低而不斷降低，這個階段稱為降速干燥階段。
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二手板式蒸發(fā)器 二手雙效污水蒸發(fā)器 二手三效污水蒸發(fā)器 二手mvr蒸發(fā)器 二手mvr高效節(jié)能蒸發(fā)器 二手mvr高效蒸發(fā)器 二手三效蒸發(fā)器 二手三效降膜蒸發(fā)器 二手三效廢水蒸發(fā)器 三效濃縮蒸發(fā)器 二手三效MVR蒸發(fā)器設(shè)備 二手三效強(qiáng)制循環(huán)蒸發(fā)器設(shè)備二手三效升膜蒸發(fā)器設(shè)備 二手三效降膜蒸發(fā)器設(shè)備二手三效濃縮蒸發(fā)器設(shè)備 二手單效蒸發(fā)器設(shè)備 二手雙效蒸發(fā)器設(shè)備","ClassName":"蒸發(fā)器","HitNumber":"1553","Type":"","ShowPrice":"0.00","MarketPrice":"5000","Price":"5000"},{"BaikeID":"1937","ProductID":"5404199","Name":"轉(zhuǎn)讓閑置二手臥式離心薄膜真空蒸發(fā)器","CompanyID":"182561","ClassID":"2337","PictureDomain":"img65","Picture":"4b8cd55bb9473d45ae9bbf22fcfe7c08ba4b053396cb638df5687de480c4c73c369469ceaafaa5f4.jpg","UserID":"202917","Descrip":"轉(zhuǎn)讓閑置二手臥式離心薄膜真空蒸發(fā)器
真空薄膜蒸發(fā)器具有很高的傳熱系數(shù)，蒸發(fā)強(qiáng)度大，對水和有機(jī)溶劑（粘度小于100cp）等達(dá)到50～300kg/m2.h。","ClassName":"蒸發(fā)器","HitNumber":"2649","Type":"","ShowPrice":"0.00","MarketPrice":"5000","Price":"5000"}]
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