An ultrasonic cleaning method

F - Mech Eng,Light,Heat,Weapons – 28 – G

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F28G 7/00 (2006.01) B08B 3/12 (2006.01) B08B 7/02 (2006.01) B08B 9/02 (2006.01) B08B 9/08 (2006.01) F22B 37/48 (2006.01)

Patent

CA 2378932

An ultrasonic cleaning method for cleaning the film, scale and sludge from internal surfaces of tubes (16), tubesheets (18), tube support plates (20) and channel heads (22) of steam generators (10) previously exposed to water or steam at temperatures of more than 200 °C introduces an ultrasonic transducer (52) or transducer array into the steam generator and submerges the ultrasonic transducer (5) and the surface to be cleaned in water or aqueous solution. Ultrasonic energy is introduced into the water at a power level of 20 watts/gallon or more and at frequencies of from 10 to 200 KHz. Large amounts of ultrasonic energy can be introduced into the water so that the energy can efficiently penetrate into the interior rows of tubes and other internal structures.

L'invention concerne un procédé de nettoyage par ultrasons conçu pour enlever la pellicule, le tartre et la boue formés sur les surfaces internes de tubes (16), de plaques tubulaires (18), de plaques de support (20) de tubes et de têtes de canaux (22) de générateurs de vapeur (10) ayant été exposés à l'eau ou à la vapeur à des températures supérieures à 200 ·C. Ledit procédé consiste à introduire un transducteur à ultrasons (52) ou un groupe de transducteurs dans le générateur de vapeur, à immerger ledit transducteur (5) et la surface à nettoyer dans de l'eau ou une solution aqueuse, à envoyer de l'énergie ultrasonore dans l'eau à un niveau de puissance de 20 watts/gallon ou plus et à des fréquences allant de 10 à 200 KHz. Des grandes quantités d'énergie ultrasonore peuvent être introduites dans l'eau, si bien que l'énergie peut pénétrer efficacement dans les rangées intérieures de tubes et d'autres structures internes.

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