Wiped Thin Film Evaporator
Application
A rotary scraper film evaporator is a highly efficient evaporation device that operates by mechanically spreading the feed liquid into a thin, turbulent film using a rotating scraper assembly. This design, which is particularly well-suited for operation under vacuum, offers significant advantages:
• High Heat Transfer Efficiency: Achieves a large heat transfer coefficient and high evaporation intensity.
• Short Residence Time: Minimizes the time the material is exposed to heat.
• Process Versatility: Features wide operating flexibility and is exceptionally effective for handling heat-sensitive, high-viscosity materials, as well as substances prone to fouling or crystallization.
Due to these characteristics, it is widely employed across the chemical, petrochemical, pharmaceutical, pesticide, food, and fine chemical industries for evaporation, concentration, and distillation purification.
Equipment Structure
The scraper evaporator is primarily composed of two major assemblies: the heating jacket and the scraping mechanism. Key auxiliary components include the motor, gear reducer, separator, feed distributor, vapor-liquid separator, evaporator shell, rotor, scrapers (featuring sliding, fixed, or hinged types), and the bottom head.
Working Principle
The scraper evaporator employs a rotating blade assembly to spread the liquid feed evenly across the inner wall of the heating tube, forming a thin film.
Upon entering the evaporator, the material is rapidly accelerated and spread by the scrapers, generating a thin, turbulent film that flows continuously over the heated surface.
The vaporized light components flow into a separator for purification and are then directed to an external condenser or subsequent processing. Meanwhile, the concentrated residue is conveyed along the heated wall and discharged through a dedicated outlet, achieving the intended separation.
Features
It demonstrates exceptional thermal performance, characterized by a high heat transfer coefficient, large evaporation capacity, and high thermal efficiency, with an evaporation intensity of up to 200 kg/(m³·h).
Operating under vacuum with a short material residence time (approximately 5-10 seconds), this system is ideally suited for heat-sensitive materials, effectively preventing component decomposition.
The unit offers wide viscosity-handling capability, accommodating materials ranging from low to high viscosity up to 100,000 centipoise (cP).
Scope Of Application
◆ Consequently, its application spans diverse industries including chemical, petrochemical, pharmaceutical, pesticide, consumer chemicals, food, and fine chemicals.
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