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當前位置:首頁技術文章淺析真空冷凍干燥機真空系統(tǒng)的工作原理

淺析真空冷凍干燥機真空系統(tǒng)的工作原理

更新時間:2021-10-13點擊次數(shù):2641
  真空冷凍干燥機廣泛應用在生物制品、藥品、食品等加工生產領域,生產過程包括產品的預凍、冷凝器的預冷、產品的升華等階段。其操作管理系統(tǒng)包括操作進入系統(tǒng)、組號選擇系統(tǒng)、冷凍干燥監(jiān)控系統(tǒng)、凍干手動操作系統(tǒng)、凍干自動操作系統(tǒng)、在位清洗系統(tǒng)等部分。提出了利用真空冷凍干燥機來加工產品,時間長,要求高,機器操作者應該嚴格按照操作管理系統(tǒng)進行,以便提高企業(yè)生產效益。
  真空冷凍干燥機上的產品生產過程:產品的預凍,冷凝器的預冷,產品的升華等階段。
  1.產品的預凍
  產品的預凍是為了固定產品,以便在真空條件下進行真空升華。如果在預凍時沒有凍牢,則在抽真空時產品會冒出瓶來。如果冷的過低,則不僅浪費了能源和時間,而且還會降低某些產品存活率。因此預凍之前應確定3個數(shù)據:預凍速率、預凍溫度和預凍時間。
  2.冷凝器的預冷
  冷凝器的預冷是在產品預凍結束保溫階段開始時預冷。當冷凝器降到-45℃,即可抽真空。
  3.產品的升華
  產品的升華包括兩個階段的干燥過程。階段一干燥,當凍干箱內的壓力降至10Pa以下,就可以給制品加熱,為制品升華提供能量,制品升華的速度由加熱能力和冷凝器的捕水能力而定。階段二干燥,當制品的階段一干燥結束進入階段二干燥時,制品的溫度可提高到其允許的較高溫度以下,維持一定的時間,使殘余水分含量達到預定值即可結束凍干。
  真空冷凍干燥機真空系統(tǒng)的原理是通過抽除干燥箱中的不凝性氣體,來有效的維持凍干過程中所需要的真空度。真空泵工作時打開干箱蝶閥,真空干燥室內的空氣及水蒸汽經過捕水器捕捉水分后進入真空泵,由真空泵排氣口排出系統(tǒng),在真空泵的排氣口裝有油霧捕集器,以防止排出氣體中的煙霧污染室內環(huán)境。為了防止水蒸氣進入泵內,系統(tǒng)配置了氣鎮(zhèn)閥,干燥過程中打開氣鎮(zhèn)閥。
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