Method for cleaning a heat exchanger
View Patent ↗A heat exchanger may be cleaned by introducing compressed nitrogen and a flushing composition through an injection device.
1. A method for cleaning the interior surface of a heat exchanger comprising introducing under pressure a mixture of a gaseous stream and a liquid flushing composition through a delivery vessel and propelling the mixture through an outlet port of the delivery vessel onto the interior surface of the heat exchanger, wherein the delivery vessel has a central tube having a bottom port for entry of the liquid flushing composition and a side port at the upper portion of the central tube for entry of the gaseous stream.
2. The method of claim 1 , wherein the heat exchanger is an air conditioning or refrigeration system.
3. The method of claim 1 , wherein the volume ratio of gas:liquid in the mixture propelled through the outlet port of the delivery vessel onto the heat exchanger is between from about 1:1 to about 1:1000.
4. The method of claim 3 , wherein the volume ratio of gas:liquid in the mixture propelled through the outlet port of the delivery vessel onto the heat exchanger is between from about 1:10 to about 1:500.
5. The method of claim 4 , wherein the volume ratio of gas:liquid in the mixture propelled through the outlet port of the delivery vessel onto the heat exchanger is between from about 1:50 to about 1:300.