Falling-Film Evaporator

Concentration by evaporation is a process for removing water by boiling, using steam (primary) as the heat transfer fluid, which transfers its latent heat to the product to be evaporated. The heating surface in contact with the product divides the unit into an evaporator and a steam condenser. Pedagogical Objectives: Study of the following experimental parameters: Continuous concentration of a solution by evaporation. Learn about Falling-Film Evaporator suppliers for optimal educational outcomes.. Influence of operating conditions. Calculations: Heat balances. Learn about Falling-Film Evaporator specifications for optimal educational outcomes.. Mass balances.

Technical Description: Every evaporator must be considered as a latent heat exchanger whose limiting transfer is the internal heat transfer through the layer of product to be concentrated. Vacuum evaporation is used for two main reasons.

100 L product tank in 304L stainless steel, with lid, drain and casters
100 L feed tank in 304L stainless steel, with lid, drain and casters
One variable-speed feed pump (also used for washing)
One variable-speed draw-off pump (option, also used for washing)
First falling-film evaporator: double-wall 304L stainless steel heat exchanger — steam circulates in the outer jacket, product flows through 3 central 304L stainless steel tubes (exchange surface: 0.12 m²). The exchanger is fitted with external insulation and baffles in the outer jacket to increase system heat capacity
Steam pressure in the first system is controlled by a proportional stainless steel solenoid valve, which can also be operated manually
Cylindro-conical 304L stainless steel decanter/cyclone for liquid–vapour separation
1 illuminated sight glass for visualizing changes in milk viscosity over time
1 vertical condenser: coil-type heat exchanger in 304L stainless steel
2 four-tube 304L stainless steel coolers
3 graduated borosilicate glass receivers; useful volume 5 litres
Heating steam pressure reduction and adjustment circuit with operator safety panel
Butterfly-type process valves for selection valves, clamp connection
304L stainless steel process piping with demountable clamp and SMS fittings
Reinforced PVC piping for cooling fluid
Borosilicate glass vacuum trap with vacuum lance (option)
Vacuum pump with vacuum pressure regulation via leakage through a stainless steel needle valve (option)
IP55 control and command cabinet equipped with: emergency stop; start/stop buttons; 10" touchscreen for control, display and data acquisition
304L stainless steel support frame with casters, 2 locking
PT100 class A temperature sensors, accuracy 0.3°C
Piezoresistive pressure sensors, accuracy 0.5%, on steam line
Bourdon-type pressure gauge, -1 to +0.6 bar, on vacuum line (optional service No. 2)
High-level probes
Electronic float flowmeter for product on feed line
Electromagnetic flowmeter on milk recirculation line
Condenser cooling water supply equipped with float flowmeter with adjustment valve and water circulation monitor for heating shutdown on cooling failure