Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1995-04-24
1997-02-11
Warden, Jill
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 221, 134 2218, 134 26, 134 30, 134 35, 165 95, B08B 310, B08B 900
Patent
active
056016573
ABSTRACT:
An improved method for cleaning heat exchangers, wherein a first cleaning liquid is used to remove a majority of the accumulated sludge and deposits from the surfaces of the heat exchanger, and a second cleaning liquid is used to remove deposits from the crevice regions of the heat exchanger. Boiling may be induced in the crevices between the tubes and the tube support plates by venting of the secondary side while heating through the primary side of the heat exchanger. Repeated venting as the water level is lowered results in crevice boiling at each tube support plate. Mechanical cleaning techniques such as pressure pulse cleaning may be utilized with either or both of the cleaning liquids. Additional liquids may be introduced into the heat exchanger to provide further cleaning action or to facilitate flushing of the previous cleaning liquids.
REFERENCES:
patent: 3248269 (1966-04-01), Bell
patent: 3527609 (1970-09-01), Vinso
patent: 4632705 (1986-12-01), Baum
patent: 5413168 (1995-05-01), Baum
"High Temperature Chemical Cleaning at Byron Unit One"--A presentation given by Wes Scheffler on Jan. 10, 1995, at the Technical Exchange Conference in Glenn Rose, Texas, sponsored by Texas Utilities.
Chaudhry Saeed
Maire David G.
Warden Jill
Westinghouse Electric Corporation
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