Vacuum evaporator

falling filmprocessfor wastewater treatment

Scraper Evaporator I. Summary The rotary scraper type film evaporator is a kind of new high-efficiency evaporator that carries out falling film evaporation under vacuum through forced film forming by rotary scraper. With such features as high heat transfer coefficient, high evaporation intensity, short flow passing time and high operating elasticity, it is especially suitable for evaporation, concentration, degassing, precipitation, distillation and purification of heat sensitive materials, materials of high viscosity, materials easy to crystallize and materials containing granules. It is widely applied in chemical industry, petrochemical industry, medicine, fertilizer, daily chemicals, food, fine chemical industry, etc. II. Structural features 1. Motor and speed reducer. It is the driving unit for rotor rotation. The rotating speed of rotor depends on the form of scraper, material viscosity and inside diameter of evaporating cylinder. The selection of a suitable linear speed of the scraper is an important parameter to guarantee stable and reliable operation of the evaporator and satisfactory evaporating effect. 2. Separating barrel The materials enter the evaporator through the inlet at the bottom of the separating barrel, and are continuously and evenly distributed on the evaporating cylinder by the material spreader installed inside the separating barrel. The secondary steam evaporated from the evaporating cylinder rises to the separating barrel.