Corrosion (presentation)

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Dissolved O 2 Secondary Side •O2is corrosive particularly if Cl- is present • Three levels of removal – Air extraction – Deaerator – Hydrazine addition • Environmental hazard – chemicals discharged in boiler blow off
Conductivity Secondary Side • Conductivity of boiler water shows the presence of bad boiler things • Specifically cation conductivity is measured – Measures the conductivity of anions Cl - , SO 4 - , HCO 3 - – IX is used to replace cations with H + – Conductivity sensitive to the anions
Page 1 and 2: Corrosion
Page 3 and 4: Uniform Corrosion • Can be a good
Page 5 and 6: Galvanic Corrosion • Chemical rea
Page 7 and 8: Cathodic Protection • Each metal
Page 9 and 10: Pitting and Crevice Corrosion Elect
Page 11 and 12: Erosion Corrosion • Flow removes
Page 13 and 14: Microbiologically Induced • Bacte
Page 15 and 16: SOLUBILITY OF Fe 3O 4 (µg Fe/kg H
Page 17 and 18: Dissolved Oxygen HTS • Oxygen is
Page 19: pH Secondary Side • pH controlled
Page 23 and 24: Moderator Over Poisoned • pH 4-6
Page 25 and 26: Flakes Sludge and Scale Scale Boile

Corrosion (presentation)

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