Method and device for cleaning the water-trickling surfaces in an air/water heat exchanger

Abstract

A method of in situ scale removal from a heat exchange body suspended in a wet cooling tower, wherein the method generates at least one air blast by a generator implementing controlled expansion via a nozzle of a mass of compressed gas in a nozzle towards a zone of the body, the generator being opened at a distance (H) from the zone, and the method consisting in repeating the operation after moving the generator under the body outside the zone.

1 .- 13 . (canceled) 
     
     
         14 . A method of in situ descaling an element body covered in a deposit, and present in a wet bag cooling tower, wherein the method consists in generating at least one air blast of large quantity of low pressure by means of a generator causing a mass of compressed air to expand towards a zone of the element so as to create a flow in said element that is substantially parallel to the surfaces of walls constituting it, the generator being open at a distance (H) from said a zone, and said operation being repeated after moving the generator along the element. 
     
     
         15 . The method according to  claim 14 , wherein the generator is moved continuously under the heat exchange body and a succession of blasts are emitted during the movement. 
     
     
         16 . The method according to  claim 14 , including a stage of heating the zone concerned of the body by a flow of hot air.