Agitated thin film evaporator vacuum pump manufactureres. Adam donaldson1, anjana thimmaiah2 1dalhousie university, 2national institute of technology karnataka corresponding author. The tubular falling film evaporator ffe is the right solution to concentrate streams containing a small amount of suspended solids, lowmedium viscous fluids and heat sensitive products. Jan 01, 2020 the concentrated product is aptly called concentrate, or thick liquor. Therefore they are perfectly adapted to the multitude of separation tasks. Design of multiple effect forcedcirculation evaporators. In a falling film evaporator the liquor is introduced at the top of a vertically arranged heating surface and forms a thin film that flows down over the heating surface. Adhering to strict rolling tolerances and a polished inner shell surface ensures excellent wiper blade performance and maximum heat transfer, leading to an optimized evaporation rate and separation. Evaporators, hydraulic design, yeast production, vinasses, distilleries, elutriation leg, magma, flash tank contents 1.
These reports have not been replaced by this present report and should still be referred to for additional information. Welcome to the world of agitated thin film dryer atfd and other heat transfer equipments. Alpha process engineers, originally a chennaibased manufacturing company, and now having supplemented its operations base with a new unit in vapi, gujarat, is in the service of the process industry since 1984. In essence, the pfaudler wiped film evaporator wfe is designed to continuously separate volatile compounds by introducing a mechanically agitated, thin film of feed material to a heated surface. The key elements of a vertical thinfilm evaporator are shown here processdesign, mechanicaldesign and physicalproperty parameters must all be taken into account william b. Alpha process engineers process equipment manufacturer, chennai. Ketav consultant leads by virtue of superior engineering design capabilities, manufacturing excellence and a project based approach committed to deliver high performance total evaporation solution customized to our client requirement. Evaporators with direct heating the use of solar heat for the production of glaubers salt has been described by holland22,23. Product is introduced above the heated zone and is evenly distributed over the evaporators inner surface by the rotor.
The short residence time allows for efficient and reliable processing of a wide variety of highboiling, heatsensitive andor viscous products. May 18, 2015 agitated thin film evaporatordryer design posted in student. Liquid distribution and falling film wetting in dairy. Feed is introduced at the top of the evaporator and is spread by wiper blades on to the vertical cylindrical surface. The wiped or agitated thin film evaporator are used to the concentration of very viscous materials and the stripping of solvents down to very low levels. The resulting vapor normally flows cocurrently with the liquid, in the centre of the tubes. Agitated thin film evaporator atfe wiped film evaporator. Process modelling and optimization of design parameters in. Alpha process engineers process equipment manufacturer. The agitated thin film evaporator consists of a jacketed shell having a machined surface on the inner side.
An agitated thin film evaporator is a recent technology used to dry the. Agitated thin film evaporator tfe manufacturers a thin film evaporator tfe consists of two major assemblies jacketed shell and a rotor assembly which rotates at high speed inside the shell. Our falling film evaporator facilitates gentle heating at a low pressure drop. Please help me with the design equations procedures for this. Agitated thin film evaporator atfe is widely used in chemical, pharmaceuticals and food industries to concentrate the feed solutions. An ideal thermal treatment solutions and heat sensitive products, where we reduce operating temperatures and operating pressures. Cfd analysis of flow pattern in the agitated thin film evaporator. In general evaporation takes place inside vertical tubes, but there are also applications where the process fluid evaporates on the outside of horizontal or vertical tubes. Comsol multiphysics is used to explore the impact of distributor width on. The lci agitated thin film evaporator also commonly referred to as a wiped film evaporator consists of two major assemblies.
We are mainly engaged in process engineering technology and our product range stands testimony to this simple truth. The basics for scaleup from the manufacturers pilot testing program are the. Therefore, it is necessary to design the thin film evaporator using simulation software aspen plus. An agitated thin film evaporator atfe, also known as thin film evaporator tfe or wiped film evaporator wfe, consists of a jacketed shell precision machined from inside and a rotor having blades that maintain a close clearance from the shell. As the product spirals down the wall, the high rotor tip. Our wiped film evaporator jacketed pressure vessels are designed and manufactured per most major worldwide pressure vessel codes. Agitated thin film evaporator industrial professionals. Comprehensive process intensification solutions for the. The thin film evaporators are designed to handle various products with operating pressures up to o. Construction of atfe the agitated thin film evaporator consists of a jacketed shell having a machined surface on the inner side.
A mathematical model and associated computer program were developed to simulate the steady state operation of wiped film evaporators for. Process modelling and optimization of design parameters in a falling film plate and frame evaporator dr. Construction of atfe the agitated thin film evaporator consists of a jacketed shell having a. Liquids with viscosities above 2,00,000cps can be handeled in these evaporators. Design and application the combshaped ptfe wiping elements of the rotafilm evaporators are pressed against the evaporation surface by centrifugal force whereas the ptfe tube ele ments used in the kd series scrape the film by rolling along the surface.
Falling film evaporator design our falling film evaporator is the simplest and most commonly used type of film evaporator. Wiped film evaporator separations research program xxii. The liquid flows as a thin film on the inside of heated vertical tubes, driven by gravity. Minton 63 mentions that the evaporator design consists of. Agitated thin film evaporator doe fellows florida international. The model concept for the flow in the thin film evaporator assumes that prior to each rotor blade a bow wave is formed. Wiped film evaporation wfe and agitated thin film evaporation are synonymous terms. Thin film or wiped film are agitated evaporators essentially a large diameter jacketed tube, in which the product is vigorously agitated and continuously removed from the tube wall by scraper blades or wipers mounted on a shaft rotating inside the tube. Sep 04, 2015 description of an agitated film evaporator. The fed feed will get into contact with the hinged blades attached to the shaft, the high rpm blades shall splash the feed onto the surface. T otit sti as the coil surface temperature, t s, must be free to vary thus ensuring that.
It is a device which is used to purify liquids with viscosities up to 105 poise to separate temperaturesensitive mixtures. It is a process of continuous evaporation whereby the process fluid is pumped into a heated evaporator device which contains rotating internal blades. Heat transfer in wiped film evaporators chemical engineering. Then, the blades fitted at the rotor spread the liquid as a thin film of min. The concentrated product is aptly called concentrate, or thick liquor. Falling film evaporation on a tube bundle with plain and. Design and fabrication of agitated thin film dryer ijariie. Sms agitated thin film evaporators are available in an unchallanged variety of different rotor designs, horizontal, vertical orientation as well as cylindrical and conical shape for direct current and countercurrent vapor flow. An agitated thin film evaporator atfe, also known as thin film evaporator tfe or wiped film evaporator wfe, consists of a jacketed shell precision machined from inside and a rotor having blades that maintain a close clearance from the shell a feed distributor at the entry point distributes the liquid in a thin film on the heated wall. Thin or wiped film evaporator is the ideal apparatus for continuous processing of heat sensitive, viscous andor fouling products. Helloi am undergoing design of mechanicaly agitated thin film evaporator i am about to start the cess fluid and utility properties are availablei need a specific reference for the process andor mechanical design. Page 1 simulations of wiped film evaporators demonstrate the complex, changing. In most services, a welldesigned and properly specified.
With the exception of agitated thin film units, the solvent is usually water, and this is assumed in most of the discussion that follows. The liquid film starts to boil due to the external heating of the heating tubes and is partially evaporated as a result. These blades force the fluid into a thin film, hence the name, over the inner walls of the evaporator. At the same time fresh material is being presented to clean heat transfer surface. Used evaporators inventory search wiped film and thin film. Agitated thin film evaporator posted in industrial professionals. The rotor blades not only deposit the liquid on the wall, but also promote turbulence in the liquid. Many tasks were performed to assess the performance of the liquid distribution systems. The high speed rotor further spreads and intensely. The evaporator is a special type of heat exchanger.
The typical agitated thin film evaporator atfe design consists of a tubular heat transfer area with an external heating jacket and a fastrevolving, inner rotor with flexible or rigid wiper elements. Sep 19, 2012 agitated thin film evaporator posted in industrial professionals. Agitated thin film evaporator manufacturer in hyderabad. The flow phenomenon is simulated using free surface multiphase model considering two continuous phases, water and water vapour. Heat and mass transfer characteristics of a wiped film evaporator. It is of interest to note that the agitated or wiped. Atfd agitated thin film evaporators manufacturer in india. Agitated thin film evaporator atfe feed film steam rotor vapourvacuum bottom condensate viscosity centipoise 50,000 100,000 2,000,000 kettle thin film, standard design thin film, special design viscosity handling capability. The liquid to be concentrated is supplied to the top of the heating tubes and distributed in a way to flow down the inside of the tube walls as a thin film. Earlier htri publications on this subject are htri report bt5 may 1980 and htri research brief 35 may 1986. The key elements of a vertical thin film evaporator are shown here process design, mechanical design and physicalproperty parameters must all be taken into account william b. Our wiped film evaporator consists in contrast to a falling film evaporator of. The splashed feed will form a film over the surface of the cylinder and due to the gravity effect, film will slide over the cylindrical vessel. Used evaporators inventory search wiped film and thin.
A mathematical model and associated computer program were developed to simulate the steady state operation of wiped film evaporators for the concentration. The typical agitated thin film evaporatoratfe design consists of a tubular heat transfer area with an external heating jacket and a fastrevolving, inner rotor with flexible or rigid wiper elements. Atfd agitated thin film dryer we recommend the dry controlfilm rotor. Simulation of an agitated thin film evaporator for. Hebeler process solutions falling film evaporator falling film evaporator.
Cfd analysis of flow pattern in the agitated thin film. The feed enters evaporator at top, tangential to shell and gets distributed along the shell by the distributor. Our high vacuum design wfe can operate to vacuums as low as one micron. A falling film evaporator is an industrial device to concentrate solutions, especially with heat sensitive components. The flow pattern in atfe has been analyzed using ansyscfx 10. A jacketed shell precision machined from the inside a rotor assembly that revolves at high speeds while closely fitting the shell. A feed distributor at the entry point distributes the liquid in a thin film on the heated wall. Falling film evaporators offer distinct operating advantages in the concentration of many materials, such as certain food products, fruit juices, pharmaceuticals and similar materials, which are particularly suited to evaporation in this type of equipment. Pdf simulation of wiped film evaporator researchgate. Feb 22, 2017 working principle of a falling film evaporator. The rotor assembly consisting of different configuration of blades depending upon the nature of product is mounted in the shell. Heavy fraction separation from used lube oil using thin film.
A distribution ring on the rotor distributes the liquid evenly across the periphery. A brief survey is made of the state of the art of thermal design for vertical intube falling film evaporators. The falling film principle requires an even distribution of the feed liquid. Wiped film evaporator the wiped film evaporator wfe, also known as an agitated thin film evaporator atfe. Atfd agitated thin film dryer mee,multi effect evaporator. Using a database that is stored in simulation programs, heat transfer. I have to design an agitated thin film evaporatordryer. Product is introduced above the heated zone and is evenly distributed over the evaporator s inner surface by the rotor. The flow pattern in atfe has been analyzed using ansyscfx.
Wiped film the wiped or agitated thin film evaporator has limited applications due to the high cost and is confined mainly to the concentration of very viscous materials and the stripping of solvents down to very low levels. Agitated thin film evaporatordryer design posted in student. With the exception of agitated thinfilm units, the solvent is usually water, and this is assumed in most of the discussion that follows. Rochelle a new mechanistic model to analyze simultaneous heat and mass transfer in vertical wiped. Bt9 vertical tube falling film evaporation stateofthe. The solvent that is removed is condensed to form process condensate, or simply condensate. Agitated thinfilm evaporators are attractive for the concentration, distillation. The university of texas at austin, 2006 supervisors. Proper design, plus the cleanliness of the heatingmedium system and the cleaning effect of the agitated thin film evaporator rotor, generally allows neglecting the fouling factors, so the relationships simplifies to the wellknown equation. Falling film evaporator mee,multi effect evaporator,atfd.
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