Bench Scale Study of the Vacuum Freezing Ejector Absorption Process Page: 87
vii, 257 p. : ill.View a full description of this report.
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recirculation pump into the absorber. This completes
the cycle for NaOH solution.
The steam boiled off in the concentrator is condensed
in a condenser and the condensate collected in a tank,
under vacuum.
A bypass line is installed which permits the operation
of the absorber or the concentrator alone, if so de-
sired. Most of the testing was done on a closed NaOH
solution loop, and thus the bypass line was not used.
A drain, for NaOH solution, is provided in the bypass
line, to drain off excess NaOH solution or to empty
the system. Drain is on the discharge side of the
dilute and the concentrate pump and thus the drainage
occurs under pressure.
A NaOH make-up tank is provided on the suction side of
the dilute pump to fill the system (or make-up) with
the NaOH solution.
Non-condensibles are removed from the Absorber, the
Concentrator and the generator (only during the start
up) by the vacuum pumps as shown.
Controls:
The temperature in the absorber, the generator, the
heater and the cooler were controlled by self con-
tained automatic temperature regulators. The level
in the absorber was controlled by a pneumatic level
controller. The level in the concentrator was not
directly controlled, as the amount of NaOH solution
in the loop was fixed and the level was controlled
in the absorber. A high and low level alarm was
used in the concentrator to warn the operator should
a malfunction occur. The butterfly valve in the 10"
line was manually controlled to maintain a desired
vapor pressure into the absorber. Once the loop
reached a steady state this butterfly valve needed
no manipulation.
Amount of steam used to heat the concentrator was
also manually set. This controlled the amount of
steam boiled off in the concentrator and under
steady state operations this was equal to the
amount of water vapor absorbed in the absorber. As
the rate of absorption was one of the variables
that was prescribed for a test the steam valve was
set for each run. Once set there was no need to
adjust it during a test.-87-
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Koretchko, J. & Hajela, G. Bench Scale Study of the Vacuum Freezing Ejector Absorption Process, report, November 1971; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc11786/m1/96/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.