How falling film evaporators are rendered tasks at distillery stillage industrial unit?
Before filling inside knowledge about film evaporators, let’s intellect what is evaporator? An evaporator means the equipment which is employed under vacuum in order to let water evaporate present in the solution through inlet feed point. Evaporators has got its exercise in food, dairy, chemical or other industries. In the plant of distillery, decreasing the volume of liquid effluents and recovering the water is essential for generating the final product. Falling film evaporators is one of the sorts, pushed in exploitation for distillery stillage. This evaporator is put in use for purposes like bio methanated spent wash and RO reject water concentration.
How does cycle within falling film evaporators conducts? ● ● ● ● ●
Product Concentrate Condensate Vapor Deaeration
â—? Steam â—? Falling Film Calandria â—? Vapor Separator
What is working direction of falling film evaporators? In such evaporators, liquid product makes its entry from the head and is equally distributed into the heating tubes placed inboard. A thin film then get in the heating tubes of falling film evaporators and flows down at boiling temperature & is evaporated to partial extent. To heat the evaporator, steam is usually used. Further, product and vapor flows downward, maintaining
the parallel format. That downward movement is hereafter augmented by the current of flowing vapor. When concentrated product separates, vapor is formed and undergo the bottom section of the separator and heat exchanger devices assembled with the falling film evaporators.
How much in numbers are the limitations of the falling film evaporators?  If great precautions and monitoring is put into action, 30% concentration might be accomplished.  Smell of fowl causes pollution in the atmosphere as well as bed environment.  High foaming and entrainment are the limits for obtaining the effective capacity of such evaporator.
Scale formation in the evaporator can be cleaned after 8 to 10 days by making the selection of the correct combination of MEE with efficient feed treatment methods. Extra effluent generation occurs because of chemical cleaning and special treatment prior to discharging to the main ETP set up. It could seem highly risky to life when bio digester overflow and falling film evaporator is approached as an Integrated Evaporation Arrangement.
Does remedial measures can be adopted in the case of falling film evaporators? Auto feed control and monitoring system can be installed for the process supervision. Auto steam/temperature control can be made a component of the evaporation frame. Operating cooling water temperature monitoring system for the correct observance. Deploying the Stand by Calandria with extra valves. For the factor to avoid scale formation, pretreatment is an important step. Is there any problem materialize in bio methanated spent wash plying falling film evaporators? Excessive foaming concludes at polluted condensate. Solution: A new design gas removing system can be brought into play which involves rotary clarifier, DSI, gas separator calandria, anti foaming mechanism, compressed air injection with filter cartridge for micronizing the air to eliminate the solids that is in suspended stage & also induced draft type gas removal unit with fines ( SS ) removal and sludge scraper.