Water treatment plant for power station consist three steps: filtration, reverse osmosis and de-mineralization.
Non stoichiometric method is particularly treatment on the filtration use ultra filtration with full polymer plus neutralizing amine and pH conditioner so that HCl consumption will reduce at de-mineralization step on cation exchanger and mix-bed process.
Finally water treatment product is produce low conductivity below 0.07 microS/cm if through condensate or feed-water, the conductivity will be increase again caused by NH3 injection to increase pH for prevented corrosion, scale potential will rise up again.
The advantage of Non Stoichiometeric method if water treatment produce more more lower than 0.2 microS/cm and pH closer that 9 so that consumption of NH3 will reduce and potential scale forming on the boiler and turbine will reduce too.
The Ryznar stability index (RSI) uses a database of scale thickness measurements in municipal water systems to predict the effect of water chemistry.
Indonesia water at rain season has 12 RSI value and non rain season has 7 RSI. Ryznar saturation index (RSI) was developed from empirical observations of corrosion rates and film formation in steel mains. It is defined as:
RSI = 2 pHs – pH (measured)
* For 6,5 < RSI < 7 water is considered to be approximately at saturation equilibrium with calcium carbonate
* For RSI > 8 water is under saturated and, therefore, would tend to dissolve any existing solid CaCO3
* For RSI < 6,5 water tends to be scale forming
Indonesia water is tend to corrosive from RSI value.
to be continue
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