Notes for plate heat exchanger cleaning
Plate heat exchangers are available in two cleaning modes: manual cleaning and in-situ cleaning. The in-situ cleaning system should be used whenever possible if conditions are met.The in-situ cleaning system can pump water (or cleaning solution) into the unit without the need to disassemble the heat exchanger. If the in-situ cleaning system is impractical for your plant, the unit can be cleaned by hand cleaning.
In-situ cleaning is the way to clean the sheets when the process liquid in the SUPERCHANGER unit is corrosive. After completing a working cycle, the residual liquid should be drained through the drain to avoid corrosion of the plate.
(1) The liquid in and out of the nozzle on both sides of the plate heat exchanger is drained. If the drain is not exhausted, the process liquid can be forcibly flushed out with water.
(2) Rinse from both sides of the heat exchanger with warm water of about 43 ° C until the effluent water becomes clear and does not include process fluid.
(3) The flushed water is discharged from the plate heat exchanger and connected to the local cleaning pump.
(4) To be cleaned, the in-situ cleaning solution is allowed to flow from the bottom to the top of the sheet, and the surface of the sheet is wetted with a cleaning solution. When cleaning the multi-flow heat exchanger, the cleaning liquid should be reversely flowed for at least 12 cleaning time to make the surface of the multi-flow plate wet.
(5) The cleaning scheme is flushing with the flow rate of the in-situ cleaning solution, or allowing the flow rate to be cleaned with the in-situ cleaning nozzle diameter (nozzle diameter 2 inches allowable flow rate 260 GPM, nozzle diameter 1 inch allowable flow rate 67 GPM). If the local cleaning operation can be carried out according to the established regular cleaning plan before the pollution, the cleaning effect will be good.
(6) After cleaning with the local cleaning solution, rinse it off with clean water.