METHOD FOR CLEANING AND PROTECTION AGAINST SCALE AND CORROSION OF HEAT POWER EQUIPMENT Russian patent published in 2006 - IPC F28G9/00 B08B3/08 

FIELD: heat power engineering, applicable for cleaning and protection against scale and corrosion of inner heating or heat-exchange surfaces of hot-water and steam boilers and heat exchangers, heating-water converter plants, accelerators, heat supply routes, heating systems of dwellings and industrial objects, cooling systems of internal combustion engines in the process of service.

SUBSTANCE: the method consists in treatment of the inner heating or heat-exchange surfaces by solutions at a cyclic or multiple circulation of them in the system with a subsequent removal of scale, an aqueous solution of a special repair=reducing composition is used for the purpose, it consists of rocks finely divided to a dispersity of 0.07 to 0.075mm including oxides of elements SiO_2, TiO₂, Al₂O_3, Fe₂O_3, FeO, MnO, MgO, CaO, Na₂O, K₂O, P₂O₅, SO₃, CO₂, H₂O used in amounts of at least one gram per liter of the volume of the treated equipment. Circulation of the solution is accomplished at the temperature of the working condition of the equipment, and the scale is removed by blow-through by water or steam at least after 72 hours of solution circulation at the following relation of the oxides of elements contains in the composition, percent by mass

EFFECT: enhanced efficiency of equipment cleaning in service and formation of a protective film on the heating surfaces preventing the repetitive scale formation thus increasing the overhaul period.