AFT097 Rising Film Evaporation Trainer Educational Equipment Thermal Demo Equipment
1 Description Evaporators are used in process engineering and food technology for increasing the concentration of solutions. Part of the solvent is removed by evaporation, which means that the solution retains a higher concentration of dissolved solids. Film evaporators are used in particular for temperature-sensitive solutions such as milk. It allows the operating behaviour of a rising film evaporator to be investigated. The untreated solution is fed from the feed tank below into the evaporator. The evaporator is a double pipe heat exchanger that is heated by steam. The steam pressure on the casing side is adjusted with a PID controller. A cyclone is installed after the evaporator to separate the evaporated solvent and the concentrated solution. The solvent vapour removed is condensed in a water-cooled condenser and collected in a tank. The concentrated solution can also be collected in a tank or fed back into the evaporator for the concentration to be increased further. The two tanks, the cyclone and the condenser are made of glass for better observation. The system can also be operated under a vacuum to reduce the boiling point of the solvent. All relevant pressures, temperatures and flow rates are measured to allow evaluation and monitoring of the process. To clean the system while installed, a pump and cleaning nozzles are fitted in the condensate and concentrate tanks. Common salt and water are the recommended materials for experiments 2 Specification rising film evaporator for increasing the concentration of temperature-sensitive solutions stainless steel steam-heated single pipe evaporator control valve for adjustment of steam pressure via PID controller water jet pump and vacuum controller to reduce the evaporation temperature separation of concentrated solution and evaporated solvent using glass cyclone glass condenser for condensation of removed solvent vapour stainless steel feed tank glass tanks for concentrate and condensate measurement of flow rate, pressure and temperature steam supply from laboratory network or 3 Technical data Rising film evaporator heat transfer surface: approx. 0,08m2 length: approx. 1,2m Control valve: Kvs value: 0,4m3/h Water jet pump final vacuum: approx. 100mbar flow rate: approx. 90L/min Vacuum controller: -100…0kPa Condenser for solvent vapour heat transfer surface: approx. 0,2m2 Tanks feed: approx. 30L concentrate, condensate: approx. 10L each Measuring ranges temperature: 7x 0…170°C pressure: -1…1bar; 0…6bar (abs); 0…10bar flow rate: 2…36L/h; 0…1000L/h 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase 120V, 60Hz, 1 phase UL/CSA optional Dimensions and weight LxWxH: 1420x750x2640mm Weight: approx. 300kg Required for operation cooling water / wastewater: min. 500L/h compressed air (control valve): 3…4bar, max. 300L/h steam: min. 3bar, min. 5kg/h
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