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Working principle of plate falling film evaporator

Views:1     Author:Site Editor     Publish Time: 2021-02-10      Origin:Site

The plate-type falling film evaporator has the advantages of high heat transfer coefficient, low gas consumption, and easy removal of scars. It has been successfully used in alkali recovery in the paper industry, food, medicine and chemical industries. Today we will take a look at the working principle of the plate evaporator.


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1. Principle of plate falling film evaporator


The plate falling film evaporator is different from the traditional tube evaporator. The so-called falling film evaporator means that the material flows down from the outer surface of the heater to produce a thin film for evaporation. The falling film plate evaporator and the plate falling film evaporator are the same product, but they are called differently. Their heating element is a plate structure.


The plate heater is composed of many heating elements. The heating element is composed of two plates, which are sealed and welded around and punched into a corrugated plate shape. The inner space of the heating element is the steam chamber of the heater, and the outer surface is the material heating surface. Many heating elements form a set of heaters.


2. The working principle of the plate falling film evaporator


The working principle of the plate falling film evaporator is that when the plate falling film evaporator is working, the material liquid enters the distributor from the top of the heating chamber, so the material liquid is evenly distributed on both sides of the vertical plate heating element and falls in a film shape while evaporating.


The secondary steam escapes from the transverse passage between the heating elements, rises along the wall, and enters the mist separator. The concentrated material is concentrated in the lower storage, and is transported to the distributor on the top of the evaporator by the circulating pump, and circulates in the evaporator. The material solution is added from the inlet pipe of the circulating pump, and the concentrated solution is sent from the outlet of the circulating pump to the next effect evaporator at a certain ratio.


The heating steam enters the cavity of the hollow heating element through the steam inlet to condense and release heat. The released heat causes the material liquid flowing down the outer wall of the heating element to be heated and evaporated to be concentrated, and the generated secondary steam is discharged through the separator. The falling film plate evaporator can be used as a single thickener or multiple groups of multi-effect evaporators in series.


The plate falling film evaporator is designed according to the principle of plate evaporator. According to different materials, effects, and different flow rates, the circulating fluid has the function of online cleaning while completing the evaporation and concentration. The plate falling film evaporator can also adjust the required production capacity according to the constant production needs.


The above is the principle of the plate falling film evaporator and the working principle of the plate falling film evaporator that the editor brings to you today. I hope to help you.


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