Cleaning Method of Plate Heat Exchanger

2021-11-15

Cleaning method of plate heat exchanger
1. Pickling: Use pickling liquid and impurities such as scale to react, which is convenient for the subsequent process.
2. Alkaline washing: The application of alkaline washing to remove organic compounds and oil stains and to soften the dirt makes it easier to remove. The time is between 10-24 hours and the temperature is usually 85 degrees Celsius. At the same time, local impurities are taken away from the surface.
3. Neutralization and passivation; passivation agent is used to form a passivation film on the surface of the metal.
4. For rinsing, the rinsing liquid is combined with the iron ions remaining in the system to reduce the content of [Fe2+/Fe3+], in order to prepare for passivation, so as to prevent the equipment metal from returning rust.
5. Water rinse after alkaline washing: to remove residual alkaline cleaning solution and generate soluble substances.
6. Water rinse after pickling: To remove the residual acid and the falling solid particles, at the same time remove the secondary rust that appears during the water rinse.
7. Water flushing and system pressure test: Water flushing and pressure test are used to remove ash, silt, metal oxides and loose dirt in the system, and the flow rate is less than 0.3 meters.
plate heat exchanger
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