METHOD OF DEPOSITS REMOVAL FROM HEAT ENGINEERING EQUIPMENT AND DEVICE FOR IMPLEMENTETION THEREOF Russian patent published in 2003 - IPC

FIELD: heat engineering equipment, particularly chemical cleaning of medium- and high-power boilers and hot-water boilers, heat exchangers, severe contaminated heating systems and other heating equipment during maintenance and day-to-day operation. SUBSTANCE: method involves treating of heating or heat-exchanging surfaces with chemical reagents by cyclic or repeated circulation of reagents through system. To implement this method discharged subacid solutions are primary used with periodic inflowing of hydrochloric acid with content of 20-28% (HC1) together with inhibitors, then 5-8% aqueous alkaline solution with temperature of 50-80 C is utilized. Washing is carried out by hot water with temperature of 50-70 C before and after passivation. Passivation is realized by 1% sodium solution or by 2% ammonia solution. Device for equipment cleaning has feeding pipeline, return pipeline connected to heat engineering equipment, processing pipelines with fittings and circulating pump which form circulating system, main hydrochloric acid tank for adding of hydrochloric acid with content of 20-28% to solution circulating into system, tank for discharged subacid solutions, tank-causticizator, filter for foam and slime separation. Main tank, tank for discharged subacid solutions, tank-causticizator and filter are mounted on common frame and connected by feeding, return and processing pipelines. Pump has three-blade impeller with sleeve O-ring to avoid cavitation by gas-contaminated environment or by foam-forming in equipment flow-through areas. Filter has vertical partition for changing of washing solution flow direction. Device has additional detachable system of polyethylene pipelines for supplying of hydrochloric acid into tank with subacid solutions, portable drainage container having exhaust pump and pipe for drainable solutions pumping-out. EFFECT: expanded usage scope, effective cleaning solution utilizing and possibility of repeated usage of some cleaning solutions, removing of thick deposits (5-10 mm thickness) of any composition and fractiousness. 5 cl, 3 dwg