Scraper film evaporator is external thin film distillation shell is equipped with heating steam jacket, its interior is equipped with rotating scraper, scraper from the cylinder center of rotation of the drive. Liquid raw materials by the evaporator after upper along the tangential to join, under the drive of gravity and rotating scraper, along the shell inner wall form the backspin membrane, to complete the liquid from the bottom of the ejector, secondary steam after defoaming device through the upper. Scraper film evaporator using centrifugal rotor of the sliding groove, is foreign latest evaporator structure, under the condition of the traffic is very small also can form a thin film, evaporation in the cylinder of the vicinity of well-bore can be adhered on the surface of the wall treatment fluid activity scraper removed rapidly, and compared to fixed clearance scraper evaporator, evaporation can increase 40-69%, it has the following properties and features:
1, high coefficient of heat transfer wiped film evaporator value, evaporation capacity is big, the evaporation intensity can reach 200 kg/m2, hr, high thermal efficiency.
2 short heating time, material, between about 5 seconds to 10 seconds, and work in a vacuum conditions are more favorable for heat-sensitive materials, keep all kinds of ingredients do not produce any decomposition, ensure the quality of products.
3, to adapt to changes in viscosity range, both high and low viscosity can be processing, material viscosity can be as high as 100000 centipoise (CP).
4, change the scraper groove direction of rotation, can adjust the running time of the material in the evaporator.
5, after evaporation section of cylinder wiped film distillation precision boring and polishing processing, surface is not easy to produce coking, scaling.
6, convenient operation, the product index adjustment easy, in an airtight conditions, can be continuous automatic production.
7, equipment cover an area of an area small, simple structure, convenient maintenance, easy washing.
Thin film evaporation equipment (Thinfilmevaporator) is a type of evaporator, the characteristic is the material flow along the heat pipe wall is membrane fluid and heat transfer and evaporation, the advantages of high heat transfer efficiency, evaporation speed, the material stay time is short, so especially suitable for the evaporation of the thermal sensitive material. Thin film evaporation equipment performance characteristics:
Vacuum pressure drop is small, the material vaporized gas from the heating surface to the outer condenser, there is a certain differential pressure. In general in the evaporator, the pressure drop (忖 p) is usually high, and sometimes hard to accept. The scraper film evaporator has larger gas through space, the pressure in the evaporator can be seen as almost equal with the pressure in the condenser, therefore, the pressure drop is small, vacuum degree can reach 5 MMHG.
Low operating temperature: due to the above characteristics, which makes the evaporation process can maintain at a high vacuum conditions. Due to the improvement of vacuum degree, as the relevant materials of the boiling point reduce rapidly, therefore, operation can be done at a lower temperature, reduce the thermal decomposition of the product.
