Water losses which occur in a steam circuit must be continuously supplemented with additional feed water. This task is carried out by full desalination systems which have the purpose of maintaining fully desalinated and desilificated water, suited for use in steam vessels. The design of the desalination plant ensures the balance of cations and anions, resulting from the raw water analysis (cation= calcium, sodium, magnesium, potassium, anion = sulfate, chloride, hydrogen carbonate, nitrate).
The full desalination plant comprises the cation exchanger, anion exchanger and mixed bed filter as well as supply container with chloric acid (HCl) and caustic soda (NaOH). The cation exchanger contains the cations and supplies defined quantities to the nitrogen ions so that the anions are available behind the filter in the form of free acids. After depletion, the filters are usually regenerated with soda lye.
If fully desalinated water (deionate) is to be generated, the mixed bed filters are connected. Here, the cation and anion mass is also available as a mixture. Behind this filter, saltfree water is attained which has a conductivity of less than 0.2mS/cm and a silicic acid content of less then 0.02 mg/l. |
