Patent ID: 8734589

Claim:
A method for cleaning an interior surface of a heat exchanger and acid residues therefrom, the method comprising: (a) introducing under pressure a gaseous stream into a delivery vessel, the delivery vessel containing: (i) a liquid flushing composition; (ii) a gaseous stream inlet port; and (ii) a central tube having a bottom feed entry port, a top outlet port, and a side port at the upper portion of the central tube, wherein the top outlet port connects to the heat exchanger, wherein the diameter of the bottom feed entry port is smaller than the diameter of the central tube; (b) propelling the liquid flushing composition through the bottom feed entry port of the central tube; (c) mixing the liquid flushing composition in the central tube with the gaseous stream entering the side port; (d) propelling the mixture of liquid flushing composition and gaseous stream through the top outlet port of the central tube onto the heat exchanger; and (e) removing acid residues from the interior surface of the heat exchanger.