How to deal with plate heat exchanger dirty

How to deal with the dirt of the plate heat exchanger?

(1) Backwashing with water:

How to deal with plate heat exchanger dirtyConnect the pump, pipe and heat exchanger in the opposite direction to the running direction, and use a water with a certain pressure for continuous open flushing to flush the debris of the heat exchanger as much as possible.

(2) pickling:

Prepare formic acid, corrosion inhibitor, surfactant and soft water in a certain ratio, then add heat exchanger from bottom to top, soak for a certain period of time, and make it react with scale regularly, then carry out cyclic pickling, and finally Diluted emissions. The main purpose is to remove the scale inside the heat exchanger.

(3) Passivation treatment:

The NaOH, Na 3P04 and demineralized water are prepared according to a certain ratio, and the heat exchanger is subjected to alkaline washing by means of dynamic circulation, so that the pH is >7 and then rinsed with water. The purpose is to neutralize the residual acid to protect the heat exchanger from corrosion. The cleaning procedure of the heat exchanger is complicated, the cost is high, and the result is difficult to observe, especially in the operation period.