How does 30% sodium hydroxide used in power plants prevent deliquescence?
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Power plants use 30% sodium hydroxide; is the color-changing silica gel used in the alkali dosing tank intended to prevent deliquescence? What impact does extremely low temperatures in winter have on sodium hydroxide?
Chromic particles have the ability to absorb moisture and indicate the amount of moisture absorbed; they are one color when dry, such as blue； It changes color after absorbing moisture, for example, turning red. The gel particles need to be replaced after changing color.
30% sodium hydroxide is already a solution; why would it deliquesce? It’s not solid caustic soda, and once it deliquesces, it’s impossible to measure it accurately； At low winter temperatures, 30% sodium hydroxide will crystallize; the crystallization temperature is 5–6°C, so it is necessary to maintain an appropriate temperature
So what is the purpose of using color-changing silica gel? Our company uses it at the top of the metering box