Control boiler alkalinity
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Can seniors talk about the control role of NaOH and Na3PO4 in steam boilers? grateful!
NaOH and Na3PO4 are mainly used in the boiler cooking process. Remove rust, oil and dirt brought into the boiler system during the installation and modification process of the boiler. At the same time, phosphate can form a passivation protective film on the surface of the metal to protect the metal of the boiler from corrosion. Keeping the boiler water at a certain alkalinity can cause the calcium and magnesium ions in the boiler water to form soft slag and be removed in time during the deposition process. The total alkalinity of low-pressure boilers can generally be controlled between 16-22. Excessive alkalinity can easily cause a false water level in the boiler. Affect the normal operation of the boiler.
Thank you for your wonderful explanation! We use a heavy oil boiler. The steam is guaranteed to be 7KG/²CM². The soft water hardness is controlled below 0.03MOL. The boiler water alkalinity is controlled between 10-13. If the alkalinity is lower than 10, alkali will be added. If the alkalinity is higher than 13, sewage will be discharged. Are there any disadvantages?