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....

Greetings This question is about hydraulics and I request an expert to answer it. A simple hydraulic machine is made up of two heads, a larger one with a larger force inside a wider pipe and a smaller one with a smaller force inside a smaller pipe in width as in the second picture on this link: http://science.howstuffworks.com/hydraulic1.htm The question is this: what happens if the smaller head and the smaller force doesn’t exist but the smaller pipe is high enough to take all the liquid? For example the larger head is 1.00 sqr metre and can go down 1.00m under a weight of 100.00kg. The cross sectional area of the smaller pipe is 0.001 sqr metre. Now when the larger head goes down 1.00m, how high the liquid from the wider pipe can go into the smaller pipe of the cross sectional area of 0.001 sqr metre? Regards

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