Cleaning and liquid contact with solids – Processes – Including application of electrical radiant or wave energy...
Patent
1991-10-09
1992-10-13
Morris, Theodore
Cleaning and liquid contact with solids
Processes
Including application of electrical radiant or wave energy...
134 10, 134 17, 134 21, 134 2211, 134 2212, 134 2218, 134 37, B08B 308, B08B 312, B08B 500, B08B 902
Patent
active
051541971
ABSTRACT:
An improved method for removing sludge and corrosion products from the interior of a heat exchanger vessel, such as a nuclear steam generator, which comprises the steps of generating a series of pressure pulses within a liquid chelate-containing chemical cleaning agent after the agent has been introduced into the interior of the vessel to create shock waves in the liquid for dislodging, dissolving and fluidizing sludge and corrosion products. The liquid chemical cleaning agent is removed from the vessel after only about 10 to 70 percent of what would have been its normal residence time without the pressure pulses. The method further includes the steps of simultaneously recirculating the chemical cleaning agent through a filter assembly during the pressure pulsing operation in order to remove fluidized sludge and corrosion products dislodged by the pressure pulsing, thereby affording them no opportunity to resettle back onto the surfaces of the heat exchanger vessel and interfere with the chemical cleaning of the vessel. The method reduces not only the time required for a particular chemical cleaning agent to effectively clean the vessel, but further reduces the number of times such chemicals need to be introduced into the vessel, which in turn results in the production of less radioactive liquid waste products.
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Auld Gregg D.
Baum Allen J.
Esposito Judith B.
Stenger William J.
El-Arini Zeinab
Morris Theodore
Westinghouse Electric Corp.
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