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六安二手蒸發器

2022-08-09 03:42:52

按操作壓力分,可分為常壓、加壓和減壓(真空)蒸發操作。很顯然,對于熱敏性物料,如抗生素溶液、果汁等應在減壓下進行。而高粘度物料就應采用加壓高溫熱源加熱(如導熱油、熔鹽等)進行蒸發。按效數分,可分為單效與多效蒸發。若蒸發產生的二次蒸汽直接冷凝不再利用,稱為單效蒸發。若將二次蒸汽作為下一效加熱蒸汽,并將多個蒸發器串聯,此蒸發過程即為多效蒸發。

中央循環管式蒸發器這種蒸發器又稱作標準式蒸發器。它的加熱室由垂直管束組成,中間有一根直徑很大的中央循環管,其余管徑較小的加熱管稱為沸騰管。由于中央循環管較大,其單位體積溶液占有的傳熱面,比沸騰管內單位溶液所占有的要小,即中央循環管和其它加熱管內溶液受熱程度不同,從而沸騰管內的汽液混合物的密度要比中央循環管中溶液的密度小,加之上升蒸汽的向上的抽吸作用,會使蒸發器中的溶液形成由中央循環管下降、由沸騰管上升的循環流動。這種循環,主要是由溶液的密度差引起,故稱為自然循環。這種作用有利于蒸發器內的傳熱效果的提高。

升膜式蒸發器其加熱室由許多豎直長管組成。常用的加熱管直徑為25~50mm,管長和管徑之比約為100~150。料液經預熱后由蒸發器底部引入,在加熱管內受熱沸騰并迅速汽化,生成的蒸汽在加熱管內高速上升,一般常壓下操作時適宜的出口汽速為20~50m/s,減壓下操作時汽速可達100至160m/s或更大些。溶液則被上升的蒸汽所帶動,沿管壁成膜狀上升并繼續蒸發,汽、液混合物在分離器2內分離,完成液由分離器底部排出,二次蒸汽則在頂部導出。須注意的是,如果從料液中蒸發的水量不多,就難以達到上述要求的汽速,即升膜式蒸發器不適用于較濃溶液的蒸發;它對粘度很大,易結晶或易結垢的物料也不適用。

結構型式對二手蒸發器傳熱的影響
 二手蒸發器的結構型式很多,不管哪種,在設計和制作時一定要使制冷劑蒸汽能很快離開傳熱表面和保持合理的液面高度,有效的充分利用傳熱表面。制冷劑液體節流時產生的少量燕汽可通過汽液分離設備使汽體與液體分離,只將分離掉汽體的液體送人蒸發器內吸熱,以提高蒸發器的傳熱效果。
  液體如能在潤濕的加熱表面上汽化沸騰,則汽泡根部細小,形成汽泡的體積不大,汽泡容易離開加熱表面而上升。若液體不能在潤濕的加熱表面上汽化沸騰,則形成的汽泡體積較大、根部也較大,汽化核心數目將減少。這時產生的汽泡就會聚集在加熱表面上,并沿著加熱表面發展產生汽膜,致使熱阻加大,放熱系數下降。常用的一些制冷劑液體均具有良好的潤濕性能,因此具有良好的放熱性能。氨比氟里昂的潤濕性能更好。在二手蒸發器中,當制冷劑側的制冷劑液體中混人潤滑油時,油在低溫下枯度很大,容易附著在傳熱面上形成油膜而不易排出,從而加大傳熱熱阻;同時形成油膜還會妨礙制冷劑液體潤濕傳熱表面,降低傳熱效能,嚴重時會使得制冷劑完全不吸收外界熱量,失去制冷作用。
  水、鹽水和空氣是制冷裝置中常見的被冷卻介質,其放熱強度除與其物理性質有關外,還與其流動速度,流速的兒何形狀以及流動的途徑等外界因素有關。流速大,流速的幾何形狀和流動的途徑合理,則放熱系數加大,但相應的動力消耗和基本設施費用也加大。適宜的流速與流體通道的布局應通過技術經濟分析、比較才能確定。

影響二手蒸發器價格的因素
二手蒸發器是一種工業生產產品,但價格一直都并不是很平穩,那么有哪些因素會影響價格呢?
  一、二手蒸發器使用價值會決策一個產品的價格,產品的使用價值越高,價格也便會高一些,一些物件較為關鍵,價格也便會相對的高些,一些物件的使用價值并不是很重要價格也就不容易很高,關鍵零部件和基本零部件價格會出現非常大的差別。
  二、供需也會影響到價格,產品的供需會影響到價格,生活水平的持續提升,大家的收益也在持續提升,對產品的需要量也在持續變多,產品的需要量越多,價格將會會高一些,這個時候銷售市場上出現需求量很高,價格會高一些;相反產品的需要量低于需求量,這個時候企業以便降低虧本的量會減少價格,這個時候價格會低一些。
  三、二手蒸發器財政政也會影響到價格,出現通脹和縮緊,這個時候銷售市場會遭受影響,產品的價格也會遭受影響,這一主要是幣的投放量超過幣的具體需要量,那樣會影響到產品的價格。自然政部門對于制造行業的一些現行策會影響到制造行業的發展趨勢,間接性的也會影響到產品的價格。如果是推動行業發展的對策,那樣產品的價格不容易有很大的轉變。

二手蒸發器設備真空度過低的原因
有用二手蒸發器的人說了:“為什么二手蒸發器設備在使用過程中會出現真空的現象呢?”今天小編就來跟大家講一下二手蒸發器為什么會出現這種現象。
1.設備各部分漏氣,空氣滲入空氣,會給真空設備增加額外負擔。嚴重的話,就無法撤離了。二手蒸發器
2.冷卻水不足,水泵除外,主要是管道堵塞,閥門損壞。冷卻水不足會阻礙蒸汽及時冷凝,嚴重影響真空設備。
3.冷卻水溫度過高:冷卻水進水溫度高,濃縮加熱會產生大量的二次蒸汽,不會及時冷凝,濃縮設備的真空度會迅速降低。

標簽:六安二手不銹鋼蒸發器、揚中二手蒸發器出售
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