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自由降膜板式蒸发器

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自由降膜板式蒸发器

外流自由降膜板式蒸发器是八十年代国际先进的蒸发器之一。其加热元件采用两张进口不锈钢薄板,四周采用缝焊,经鼓压,点焊而成。板式蒸发器与其他蒸发器相比,在生产使用上不断地显示出其优越性,目前,正在逐步地替代列管式蒸发器,可广泛应用于多种行业。如淀粉及淀粉深加工浆液的浓缩,造纸制浆废液的回收,酒精废液的浓缩,铝厂氧化铝溶液的浓缩及其它工业污水的浓缩和回收等。
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外流自由降膜板式蒸发器是八十年代国际先进的蒸发器之一。其加热元件采用两张进口不锈钢薄板,四周采用缝焊,经鼓压,点焊而成。板式蒸发器与其他蒸发器相比,在生产使用上不断地显示出其优越性,目前,正在逐步地替代列管式蒸发器,可广泛应用于多种行业。如淀粉及淀粉深加工浆液的浓缩,造纸制浆废液的回收,酒精废液的浓缩,铝厂氧化铝溶液的浓缩及其它工业污水的浓缩和回收等。

同列管式蒸发器相比,外流自由降膜板式蒸发器具有不易结垢,热效率高,蒸发强度高,出液浓度高,操作平稳,清洗方便等优点。

Outflow free falling film plate evaporator is one of advanced evaporator in 1980s. its heating elements use two sheet stainless steel plate after pressure and welding to be one. Compared with other evaporator, it has more advantage and gradually replace the pipe type evaporators. It is used widely in various industries, such as thickening of starch or pulp of starch deep pressing, recovery of waste liquor of paper-making and pulping, thickening of alcohol waste liquid, alumina solution thickening and thickening and recovery of waster liquor of other industry. 

工作原理

借助于循环泵,液体至加热元件上面特别设计的液体分配器,通过分配器,液体均匀地淌在加热元件上向下流动,并形成覆盖整个加热表面的均匀的液膜,液膜在从加热元件上部起很短的距离内就加速到不稳定速度。由于加热元件表面凹凸不平,液体膜既在垂直方向又在水平方向流动,这种运动保证了加热表面所有时间都完全是湿的,它同时还引发了再次混合,这样,液体在其向下通过加热表面时,水蒸气就自然地从加热元件之间溢出。由于极大的面积,水蒸气速度很慢,这样就不会干扰液体的流动。这就从根本上消除了分布不均和过浓缩的隐患,而分布不均和过浓缩会造成结垢。

外流自由降膜板式蒸发器与管式蒸发器相比具有许多优点,如果我们检查结疤的倾向,我们发现这种板式蒸发器本质上就是自清洗。在蒸发过程中形成的结垢,由于蒸发器中压力变化及液膜的冲刷,能自由剥落。另外,由于液体循环速度慢,

消耗的能量就小。

With the aid of circulating pump, the liquid reach a special liquid distributor on heating element, the liquid flow evenly on the distributor and fall down, and form even liquid membrane cover on the whole heating surface. As the heating element surface is uneven, the liquid membrane can move both in vertical direction and horizontal direction, this type movement ensure the heating surface keeping wet all the time, and it also cause secondary mixing. Thus, when the liquid flow through the heating surface, the vapor can naturally overflow from the heating element. Because of great area the vapor flow slowly so that can not interfere with the flow of liquid. That is fundamentally eliminate the scaling caused by uneven distribution and enrichment thickening.

Compared with pipe type evaporators the outflow free falling membrane evaporator has many advantages. It is essentially self-cleaning. The scaling produced in the evaporation process can fall down freely under the pressure difference and the flushing of liquid membrane. In addition, due to slow liquid circulation speed, the energy consumption is small.

 

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