Lect-2_Feed water

Lect-2_Feed water - Feed Water Technology Anders Wik...

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Feed Water Technology Anders Wik
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Chemistry issues in Power Plants • Flue gas analysis (environmental issues) • Fuel analysis • Water chemistry • Radiation protection (only Nuclear Power Plants)
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Short version • Get rid of hardness – Causes scaling in tubes which leads to overheating • Get rid of oxygen – Causes corrosion in various systems • Keep pH up >9 – If not, corrosion occurs
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Water in Nature
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Ion exchange • In operation mode: •2 R - S O 3 Na + Ca 2+ (R-SO 3 ) 2 Ca + 2 Na + • In regeneration mode: • The reverse formula above, i.e. an equilibrium reaction •2 R - S O 3 Na + Ca 2+ ' (R-SO 3 ) 2 Ca + 2 Na + (The two-way arrow means that the reaction is reversible)
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Deionisation • In cation exchanger: •R - S O 3 H + Na + R-SO 3 Na + H + • In anion exchanger: •R - N O H + C l - R-NCl + OH - • Quick reaction in water phase: •H + +OH - H 2 O
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Osmsosis and RO
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Lect-2_Feed water - Feed Water Technology Anders Wik...

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