| abstract |
Method and device for detaching and removing soot and solid coatings from surfaces in closed spaces such as the smoke gas side of an oven or boiler. In the case of an oven, the covers and the flue pipes (4) to the flue gas side are sealed to form a closed chamber, into which unpressurized steam is sent. The method is characterized in that the vapor, before being introduced into the confined space, is saturated with a detergent composition (14), comprising synthetic surfactants, alkalis, complexing agents, a corrosion inhibitor and environmentally friendly solvents and solvent vehicles. The cleaning of the metal surface is carried out in one or more stages and is followed by a passivation step of the metal surface, during which the surface is coated with a passivating agent which prevents continuous deposition on the surface. metallic. The device is characterized in that it comprises a container (15) for the liquid detergent composition (14), this container being connected by means of a line (13) to a reduction valve (11), through which the water flows to a steam production chamber (8), which comprises a device (9) for vaporizing the water at the same time as this composition. The combined water vapor and composition are conveyed via a steam line (7) to the enclosed space to be cleaned, for example the smoke gas side of an oven (1). |