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降膜快三平台首頁優點缺點和一般蒸發器對比 當前位置: 網站首頁 > 降膜快三平台首頁優點缺點和一般蒸發器對比
降膜快三平台首頁優點缺點和一般蒸發器對比
加入時間:2019-09-29 
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降膜蒸發器是一種高效蒸發設備,其與升膜蒸發器、刮板式薄膜蒸發器統稱為薄膜蒸發器。薄膜蒸發器優點顯著,在化工、輕工及食品加工行業內被廣泛應用,以達到液體濃縮的目的。降膜蒸發器的結構其實並不複雜,可以簡單理解為立式列管式換熱器內加一套布膜裝置,但是它與普通換熱器又有一個明顯的差異,其殼程固定為加熱流體,管程固定為被蒸發物料。


The falling film evaporator is a kind of high efficiency evaporation equipment, which is called the film evaporator with the rising film evaporator and the scraper type thin film evaporator. Thin film evaporator has obvious advantages and is widely used in chemical industry, light industry and food processing industry to achieve the purpose of liquid concentration. The structure of falling film evaporator is not complicated, can be understood as a simple vertical tube for a cloth membrane device heater, heat exchanger and ordinary but it has an obvious difference, the shell is fixed to the heating fluid, Guan Cheng fixed evaporated material.


降膜蒸發器管程所走物料都是從管頂進入換熱管,借助自身重力沿管內璧向下流,在進入換熱管之前,需經過布膜器布膜,因而進入換熱管的時候會呈薄膜狀,在物料自上而下的過程中水分被蒸發出去,從而達到物料濃縮的目的,殼程如果是用蒸汽冷凝加熱或導熱油加熱,若使用蒸汽則上進下出,若選用導熱油則應自下而上。由此可見,管內外介質流向不一定都是逆流。


Falling film evaporator tube take materials are from the top of pipe in the heat exchanger tube, with its own gravity to the downstream along the tube wall in the heat exchanger tube before, after the cloth membrane cloth membrane, which enters the heat exchanger tube is thin, in the process of material from the top to the bottom water is evaporated sent out, so as to achieve the purpose of material concentration, the shell if it is heated by condensing steam heating or heat conducting oil, if the use of steam coming out under, if the selection of heat conducting oil should be bottom-up. Thus it can be seen that the flow direction of the medium and outside the tube is not always countercurrent.


但這並不重要,因為管內壓力基本不變,不會引起流體溫度變化,管內介質溫度改變隻是由於介質濃度變化而引起沸點升高(這也隻是略微升高而已)。

But this is not important, because the pressure inside the tube is basically unchanged, which will not cause the change of the fluid temperature. The change of medium temperature in the tube is due to the increase of boiling point due to the change of medium concentration, which is only a slight increase.

降膜蒸發器優點分析:

(1)換熱管內物料停留時間短,不會影響熱敏性物料化學性質;

(2)換熱管內物料呈薄膜狀且流速快,蒸發換熱係數大;

(3)壓降幾乎為0,管程物料處於常壓環境,完全靠自身重力沿管內壁往下流,可節能;(4)由於管程物料靠自身重力沿管內壁往下流,而非用壓差來推動,所以可選用低溫差;

.(5)管程空間物料滯留量非常少;

(6)管程物料加熱後表現為對流沸騰,所以換熱管表麵狀態幾乎不影響物料沸騰。降膜蒸發器缺點分析:

(1)設備蒸發效果與分布器有直接關係,對分布器的設計製造安裝要求都非常高;

(2)設備安裝要求高,主要表現為垂直度要求,假設換熱管長度為9m,設備垂直度則要求≤6. 4mm;

(3)需保證設備換熱管內壁完全濕潤但布膜厚度又不能太大,需對物料進料量和換熱管長度進行非常準確的設計計算才能滿足這樣的要求;

(4因設計製造要求都很高導致設備采購成本非常高;

(5)對於易結垢或含固體懸浮物的物料不適用。



Analysis of the advantages of the falling film evaporator:


(1) change of the material in the heat pipe with short residence time, does not affect the chemical properties of heat sensitive materials;


(2) the material in the heat exchange tube is thin film and the flow velocity is fast, and the heat transfer coefficient is large.


(3) the pressure drop is almost 0, and the pipe material is in the atmospheric pressure environment. It can flow down along the inner wall of the pipe entirely, and it can save energy. (4) because the pipe material flows downward along the inner wall of the pipe itself instead of the pressure difference, the low temperature difference can be chosen.


(5) there is very little retention of space materials in the tube range;


(6) the tube material is heated by convection boiling, so the surface state of the heat transfer tube almost does not affect the boiling of the material. Shortcoming analysis of falling film evaporator:


(1) the effect of the evaporation of the equipment is directly related to the distributor, and the requirements for the design, manufacture and installation of the distributor are very high.


(2) the equipment installation requirements, mainly for the requirement of verticality, assuming the tube length is 9m, is less than 6. 4mm vertical equipment;


(3) it is necessary to ensure that the inner wall of the heat exchanger tube is completely wet, but the thickness of the film can not be too large. It is necessary to design and calculate the material feed quantity and the length of the heat exchanger tube accurately.


(4 because of the high requirements of design and manufacture, the cost of equipment procurement is very high;


(5) it is not applicable to materials that are easily fouled or containing solid suspension.


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