thermal power station

[zuhair2000]

dear sirs
ineed advice for which ferrous material is the most
suitable for secondary super heater tubes in thermal
power station 320MW 540C steam temperature 160 kg/cm2
pressure and if its possiple to use SA213T22

 

[athomas236]

According to 41st Edition of the Babcock book "Steam", SA213T22 is sutable for tube temeratures up to 600C.

Whether it is cost effective to use up to such a temperature is another issue.

athomas236

 

[davefitz]

you will need to calcualte the max mean metal temperature MMMT along the entire length of the "worst tube" in the secondary superheater over a range of loads and operating conditons, then determine for this worst MMMT whihc material is most economical .In addition to the asme allowable stress at operating temperature, you will need to also consider oxiation , corrosion, and structural support limitiations associated with the MMMT .

So, it is possible that some sections of the secondary superheater may be made of T22, but one cannot say without detailed calcualtions that all tubes throughout the heat exchanger can be fabbed of T22 simply by stating the desing average steam outlet temp is 540 C..

 

[metengr]

zuhair2000;
If you are the owner/user of the Power Station, I would put generate a bid specification and have the major boiler OEM's provide material recommendations for consideration. Most of the major boiler OEM's have software that can model mean temperature over the entire foot print of the steam circuit based on fuel type and other factors that davefitz mentioned.

 

[boilerone]

In general knowledge and experience, T22 is typically good for the 2nd superheater of your application.