Should sodium hydroxide or sodium carbonate be added to boiler water with low alkalinity?

Of course, adding NaOH can improve the alkalinity of boiler water. Sodium hydroxide and trisodium phosphate should be added at the same time according to 6:4, not just one.

When the raw water is surface water, the purpose of pretreatment is to remove suspended matter, colloid and organic matter from the water. Coagulant (such as aluminum sulfate, etc. ) is usually added to raw water to condense the above impurities into large particles, which sink by their own weight and then filter into clear water. When groundwater or urban water is used as supplementary water, the pretreatment of raw water can be omitted and only filtration can be carried out.

The commonly used clarifiers are pulse clarifiers, hydraulic accelerating clarifiers and mechanical stirring clarifiers. Filtering equipment includes siphon filter, valveless filter and single-flow or double-flow mechanical filter. In order to further remove the organic matter in the water, an activated carbon filter can be added.

Extended data:

With the continuous improvement of boiler parameters and the appearance of once-through boilers, it is even required to desalt all boiler feed water. At this time, desalination must be adopted.

There are many kinds of ion exchangers used in chemical desalination, among which cation exchange resin and anion exchange resin are the most commonly used. In the ion exchanger, when the brine flows through the resin, the cations and anions in the salt are respectively converted by the cations (H ()) and anions (OH ()) in the resin and then removed.

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