Production Of Scraper Evaporator Introduction

The scraper evaporator is a new type of evaporator with strong adaptability, featuring high viscosity, good heat sensitivity, easy crystallization and scaling.It consists mainly of a heating jacket and a scraper.The steam is heated in the jacket.The scraper is mounted on the rotating shaft.The inner wall of the scraper and heating jacket maintains a small gap, typically 0.5-1.5 mm.After preheating, the feed liquid is added tangentially from the upper portion of the evaporator.Under the action of gravity and rotating scraper, it is distributed on the inner wall to form a film that is not rotating, and is continuously evaporated and concentrated during the lowering process.The liquid is discharged from the bottom and the secondary steam escapes from the top.In some cases, the evaporator can evaporate the solution to dry it and produce a solid product directly at the bottom.

The material continuously enters the horizontal evaporator from the large diameter end, and the scratched diaphragm accelerates the distribution, immediately forming a flowing film on the heated surface.The tapered thin film evaporator relies on the centrifugal force exerted by the rotor on the material.The centrifugal force has two effective forces, one perpendicular to the heated surface and the other toward the large diameter end body (note: the same result also appears in the vertical cone thin film evaporator).