METHOD FOR CLEANING HEAT EXCHANGE SURFACES AND BOILER PIPES FROM RESIDUES Russian patent published in 2019 - IPC F28G13/00 F28G1/16 

FIELD: power engineering.

SUBSTANCE: invention relates to power engineering, can be used in cleaning of various heat exchange surfaces and pipes of boiler plants, first of all, during repair and restoration works. Cleaning of residues is carried out during repair works or scheduled maintenance of boilers during operation, fluorine powder is used as a powder chemical reagent, it is supplied to furnace area into fuel combustion zone, having temperature of more than 500 °C, providing a thermal decomposition reaction of the fluorocarbon powder to form gaseous fluorine, and simultaneously controlling and maintaining temperature on heat exchange surfaces and boiler pipes of less than 400 °C for reaction of fluorine vapor with residues, this process is carried out for 10 minutes to 12 hours depending on thickness and density of residue, and amount of powder fluorocarbon supplied is calculated depending on volume of furnace space and area of heat exchange surfaces, but not less than 10 g per 1 m³ of furnace space, Then the boiler is stopped, supply of fuel and powder of the fluorocarbon is stopped, the furnace space is ventilated and the remaining loosened residues are removed from the heat exchange surfaces and boiler tubes by additional mechanical cleaning. Device for method implementation represents a sprayer and comprises sealed container with fluorocarbon powder, connected to injector central cavity with main line with shutoff valve, compressed air cylinder connected to compressed air supply pipeline to injector inlet channel through control valve, wherein the sealed containers with fluorocarbon powder and abrasive material are equipped with breathing valves, and through holes of the tip are made in the form of truncated cones.

EFFECT: higher safety of cleaning of heat exchange surfaces and boiler tubes from residues, and reduction of material costs for mechanical cleaning of surfaces from residues.

3 cl, 1 dwg