METHOD OF SCALE REMOVAL Russian patent published in 2013 - IPC B08B9/08 F28G7/00 

FIELD: process engineering.

SUBSTANCE: invention relates to scale removal and can be used under household and industrial conditions, for example, for removal of scale from teakettles or from "wet" surfaces of automotive engine cylinder blocks, or the like. Acid-based detergent solutions are filled in the vessel to be cleaned and held therein for a definite time. Said vessel is prefilled with water to be boiled and cooled to ambient temperature. Then, vessel is cooled further to below minus four degrees Centigrade to generate vibration in scale area. Then, vessel with ice is heated and, again, scale is subjected to vibration to remove water along with scale particles. Cooling temperature is selected with due allowance for tank material strength. Frequency of vibration should, in the first case, equal the scale material intrinsic oscillation frequency and, in the second case, it must equal to tank material intrinsic frequency.

EFFECT: higher efficiency of scale removal.