Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1993-04-27
1994-11-01
Hruskoci, Peter A.
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
210742, 210101, 210143, 210149, 364500, C02F 508
Patent
active
053605497
ABSTRACT:
A method of and a system for monitoring circulating water systems for conditions susceptible to deposition of a variety of scaling deposits. The invention includes presenting upset conditions at a surface area in the circulating water stream, or in a sidestream in a conduit connected to the main circulating water system, and closely monitoring either heat transfer rate or heat transfer resistance at the water contact surface adjacent the area of upset. When conditions for scaling are present, the upset conditions tend to cause formation of scale deposits at the upset area before the scaling occurs in the main circulating water stream, permitting countermeasures to be taken which inhibit scaling. In the specific case of boilers, heat exchangers or cooling towers, CaCO.sub.3 scaling is monitored at an area where the upset conditions are present, the upset conditions are an increase in the heat transfer rate. The solubility of CaCO.sub.3 being inversely proportional to temperature, an increased heat transfer rate causes scaling which is monitored first at the upset area, and the presence of CaCO.sub.3 in the water stream is counteracted by automatic increase in the amount of scaling inhibitor pumped into the system.
REFERENCES:
patent: 4648043 (1987-03-01), O'Leary
patent: 5171450 (1992-12-01), Hoots
patent: 5174654 (1992-12-01), Droege
patent: 5185533 (1993-02-01), Banks et al.
patent: 5248198 (1993-09-01), Droege
Droege Thomas F.
Mouche Richard J.
Hruskoci Peter A.
Nalco Chemical Company
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