METHOD FOR CLEANING SURFACES OF MACHINE PARTS AND GAS DUCTS FROM SCALE Russian patent published in 2019 - IPC B08B5/00 

FIELD: power engineering; machine building.

SUBSTANCE: invention can be used in cleaning various heat exchange surfaces, parts of engines and gas ducts from soot and other deposits. Fluorocarbon powder 3 is loaded into reservoir 1, while free gas space 2 is left in upper part of reservoir 1. Energy is supplied from heat source 6 to heat exchanger 7. Due to supplied energy, powder of fluorocarbon is heated to temperature higher than 600 °C, resulting in a thermal decomposition reaction to form gaseous fluorine. From inert gas source – argon of high pressure 8 through control valve 9 inert gas is supplied to pipeline of inert gas supply 4, which is put into lower part of reservoir 1. Through distribution manifold 12 inert gas from pipeline 4 is uniformly distributed throughout volume of reservoir 1 and from below passes through layer of heated powder of fluorocarbon 3. During movement through layer of powder of fluorocarbon 3 inert gas is mixed with fluorine vapours and enters gas cavity 2 of reservoir 1. From gaseous cavity 2 mixture of formed gaseous fluorine and argon is supplied via pipeline 5 directly to cleaned surfaces of parts by means of replaceable branch pipe 11. In order to exclude considerable fluorine powder suction from gas cavity on pipeline 5 filter 10 is provided. Control valve 9 provides adjustment of pressure and flow rate of argon passing through powder of fluorocarbon 3 in reservoir 1. Since this method involves heating fluorocarbon powder to temperature higher than 600 °C, reservoir 1 is made with heat insulation 13 applied on outer side of reservoir 1.

EFFECT: cleaning of surfaces of parts without their dismantling, reduction of cleaning time, reduction of energy consumption for heating, increase of scale loosening rate.

2 cl, 1 dwg