Method for chemistry control in cooling systems

Liquid purification or separation – Processes – Ion exchange or selective sorption

Reexamination Certificate

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Details

C210S687000, C210S743000, C210S746000

Reexamination Certificate

active

07632412

ABSTRACT:
A method for controlling a cooling water tower comprising: providing a cooling tower system, which includes a recirculated evaporative cooling water stream, a source of make-up water, an evaporative cooling unit, a heat exchanger, a bleed off line, and a bleed-off valve which is in communication with said bleed-off line; providing a plurality of conduits through which said makeup water flows into said evaporative cooling water stream, wherein there is at least a first conduit that contains a weak acid cation ion exchange column and a second conduit that does not contain a weak acid ion exchange column, and wherein each conduit has at least one conduit valve; choosing a pH and a conductivity setpoint value and a deadband value above and below said setpoint value in said cooling tower system; measuring both the pH of said evaporative cooling water stream with one or more pH meters and conductivity of said evaporative cooling water stream with one or more conductivity meters; and implementing a response to said conductivity measurements and pH measurements is disclosed.

REFERENCES:
patent: 4427553 (1984-01-01), Fore
patent: 4532045 (1985-07-01), Littmann
patent: 4648043 (1987-03-01), O'Leary
patent: 4931187 (1990-06-01), Derham et al.
patent: 5057229 (1991-10-01), Schulenburg et al.
patent: 5730879 (1998-03-01), Wilding et al.
patent: 6746609 (2004-06-01), Stander
patent: 2006/0096930 (2006-05-01), Beardwood
patent: 325046 (1989-07-01), None
Kemmer, F. N., ed. The NALCO Water Handbook, 2nded. New York: McGraw-Hill, 1988, ISBN 0070458723 pp. 12.19, 38.12, and 38.29.

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