This absorption and stripping system enables to study the mass transfer from a gaseous phase to a liquid phase (absorption) and vice versa (stripping). The absorbing liquid is fed by a metering pump to the top of a column with glass Raschig rings packing. The gaseous phase is the result of the mixture between the gas to be absorbed and a carrier gas; the flow rates of these two gases are measured by mass flowmeters. The automated version includes a PID controller that controls the flow rates of gases automatically via two pneumatic valves.
TRAINING PROGRAM
This unit enables to deepen the following issues:
• Checking the absorption degree with different liquid substances at different temperatures
• Desorption of liquid phase into gaseous phase with a gas
• Calculation of the number of theoretical stages
• Automatic flow control by PID controller
• System supervision by P.C.
• Absorption of NH3 with H2O
• Absorption of CO2 with solution of NaOH
• Stripping of NH3 with air
TECHNICAL SPECIFICATIONS:
• Framework of AISI 304 stainless steel with castors
• Column of borosilicate glass DN 80, H = 1000 mm, packed with Raschig rings
• Heat exchanger of borosilicate glass, with exchange surface of 0.5 m2, installed at the bottom of the column
• Feeding tank of AISI 304 stainless steel, with capacity of 30 l
• Metering pump of AISI 316 stainless steel, Qmax = 270 l/h, including pneumatic actuator, that can be driven by a signal of 0.2 to 1 bar
• 2 pneumatic control valves of AISI 316 stainless steel, DN 15, Cv = 0.2 and 0.08
• Electronic thermal mass flowmeter of AISI 316 stainless steel, with range of 0 to 600 Nl/h and board-type display, for measuring the flow rate of the gas to be absorbed
• Electronic thermal mass flowmeter of AISI 316 stainless steel, with range of 0 to 6000 Nl/h and board-type display,for measuring the flow rate of the carrier gas
• Electronic differential pressure transmitter of AISI 316 stainless steel, range of 0 to 200 mm H2O, 4-20 mA output signal, board-type display
• 3 thermo resistances Pt 100 with sheath of AISI 316 stainless steel
• 3 electronic temperature indicators
• 3 pneumatic manual controls
• Piping and valves of AISI 304 and AISI 316 stainless steel
• Switchboard IP55, complying with EC conformity mark, including plant synoptic and ELCB
• Emergency button
Besides being provided with all the characteristics of, this model also includes the following additional items:
• 3 electropneumatic converters (4 to 20 mA/0,2 to 1 bar)
• Microprocessor digital PID controller with serial card
• Supervision software for Windows: it enables to control ON-OFF signals, analog signals coming from PID controller, real-time trend and historical trend
