Answer / kumar

Hi Rathnam, Dew Point Corrosion in Heat Recovery Steam
Generator(Boiler). In this HRSG one Condensate Reheating
Tubes module is provided. For this module we will give DM
water supply as a Feed Water supply. This DM water will be
at Atmospeheric temperature. To increase this water
temperature we will pass this water into CRH tubes. After
CRH the temperature should be mini 150deg.C. Unitll this
temperature reaches this water will Re-circulate itself by
Re-circulation pump. Afther getting 150deg, it will go to
Boiler Drum. In HRSG write-up, they written as "To avoid
Dew point corrosion in CRH, we have to heat the water upto
150deg".

Go it naa?


thank you

Answer / rathnam

dear friend I had not understood which dew point.

Answer / shanmuganathan

Normally In flue gas we have so3,,, when the glue gas reached dew point temperature,there is some h2o will present...so so3+h2o=h2so4(sulfuric acid)it will leads corrosion in boiler tubes....

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