AN ULTRASONIC CLEANING METHOD

摘要

An ultrasonic cleaning method for cleaning the film, scale and sludge from internal surfaces of tubes (16), tubesheets (18), tube support plates (20) a nd channel heads (22) of steam generators (10) previously exposed to water or steam at temperatures of more than 200 ~C introduces an ultrasonic transduce r (52) or transducer array into the steam generator and submerges the ultrason ic 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.