introduction
Scraper evaporator is a new type of evaporator with strong adaptability, for example, it is suitable for materials with high viscosity, heat sensitivity and easy crystallization and scaling. It is mainly composed of a heating jacket and a scraper. Heating steam is passed through the jacket. The scraper is mounted on a rotatable shaft. The scraper and the inner wall of the heating jacket maintain a small gap, usually 0.5 to 1.5 mm. After preheating, the material liquid is added in the tangential direction from the upper part of the evaporator. Under the action of gravity and the rotating scraper, it is distributed on the inner wall to form a down-spin film, and it is continuously evaporated and concentrated during the descending process. The secondary steam escapes from the top. In some cases, this kind of evaporator can evaporate the solution to dryness and obtain a solid product directly at the bottom.
Characteristics of scraper evaporator
1．The scraper evaporator has high efficiency and large capacity, and the evaporation capacity of water and organic solvents is 100-300Kg/h·m².
2．The material to be processed in the scraper evaporator stays on the evaporation surface for a short time, about ±10 seconds, without coking or scaling.
3．Scraper evaporator can realize low-temperature evaporation under vacuum conditions.
4．The scraper evaporator is suitable for continuous production, with large operating flexibility, simple structure, easy maintenance, and automatic control.
5．The scraper evaporator changes the inclination angle of the groove on the outside of the scraper, and can adjust the residence time of the material in the evaporator to meet the needs of evaporation of materials with different viscosity.
6．All parts and equipment of the scraper evaporator that contact the material liquid are made of stainless steel, thus keeping the material liquid from being contaminated.
7．The top of the scraper evaporator is equipped with a quick-opening cover to facilitate the scrubbing of the heating tube. There are light holes and sight glasses on both sides of the top for easy observation during operation.
Application range of scraper evaporator
Scraper evaporators are widely used in petroleum, chemical, pharmaceutical and other industries, especially suitable for high viscosity (such as tannin extract, honey, etc.) and materials that are easy to crystallize, scale, and heat sensitive.
