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The basic experiment includes: laminated desk-top
work surface, air and water pressure regulators, rotameters with manual valves,
manometer, 36" x 4" glass column, 3/8" ceramic Raschig rings,
valved tracer injection ports, stainless steel fittings and tubing,
conductivity probe, and conductivity meter.
A water manometer measures the
pressure drop, in the range of 0 to 6 cm H2O, across the column. A moveable
water outlet line allows the water level in the bottom of the column to be set.
By injecting KCl tracer above and
below the packing, students may calculate the mean residence time and volume of
water contained between the injection point and the probe, as well as the
holdup on the packing. An infrared analyzer can be used to measure the ammonia
level.
Under optional computer control, the signal from the analyzer is acquired by a
computer and processed by a PID control algorithm, directing a valve in the
water feed line. The students can determine the effect of controller gains on
the response to set point, air flow rate, or ammonia flow rate changes.
*Shown with optional NH3 analyzer.
A video overview is provided to give a more in-depth
look at this rig.
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