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Steam Pressure Reduction


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#1 Rahimzadeh

Rahimzadeh

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Posted 11 October 2010 - 08:13 AM

Dear friends:
I WANT TO KNOW IS IT POSSIBLE TO PRODUCE SUPERHEATED STEAM FROM SATURATED STEAM?
1-SATURATED STEAM PRESSURE :11.5 Barg
2-SUPERHEATED STEAM PRESSURE :6.9 Barg

Thank you in advance
M.R.Rahimzadeh

#2 ankur2061

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Posted 11 October 2010 - 08:23 AM

Rahimzadeh,

When you reduce the steam pressure through any throttling device (control valve, orifice), the steam at the outlet of the throttling device will be superheated. The method to calculate the degree of superheat considering an ideal adiabatic expansion can be found in the spreadsheet attached in the following link:

http://www.cheresour...2615#entry32615

However, the calculated value may be higher than the actual degree of superheat since there is no ideal adiabatic expansion process in real life. Generally the temperature is meaured after pressure reduction to know the actual degree of superheat of the superheated steam.

Hope this helps.

Regards,
Ankur.

#3 katmar

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Posted 11 October 2010 - 01:46 PM

See also my comments in the thread referenced by Ankur regarding the effect that the quality of the saturated steam has on the temperature of the steam after pressure reduction.

#4 Rahimzadeh

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Posted 14 October 2010 - 06:01 AM

Dear katmar: i think i could not tell my question meaning and therfore you misunderstood my question .
When a saturated steam reduced its pressure through a reducing valve the pressure and temperature reduce simultaneously and we will faced with two phase vapour and liqud of water .T-S Diagram can show effectively.
best regards
Rahimzadeh,

When you reduce the steam pressure through any throttling device (control valve, orifice), the steam at the outlet of the throttling device will be superheated. The method to calculate the degree of superheat considering an ideal adiabatic expansion can be found in the spreadsheet attached in the following link:

http://www.cheresour...2615#entry32615

However, the calculated value may be higher than the actual degree of superheat since there is no ideal adiabatic expansion process in real life. Generally the temperature is meaured after pressure reduction to know the actual degree of superheat of the superheated steam.

Hope this helps.

Regards,
Ankur.






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