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It's a real problem where we today have a steam throttle and would like to change it for a steam turbine/expander to provide some electricity.

The problem is that the steam is at condensationline:

16 [bar] – T=201,37 [C] – h=2793,65 [KJ/kg]– s=6,4216 [KJ/kg*K]

with an isentropic process over the turbine/expander the steam would get to:

p = 6.6673, v = 0.2693, t = 163, x = 0.9421, h = 2.6395e+003, s = 6.4216

you see that the steam will be wet!

the above gives the Power:

P= (efficiency) * 12 [kg/s] * 154.15 [kJ/kg]= 1849.8 kW

the efficiency will lower the power alot.

Now my question is if someone have solved something similar or know what to choose? Is it possible to use a steam turbine when the steam is this wet? Can a double screw expander be an alternative? We have to regulate the outlet to 163C, will this influence oour choice? What retailers exists?

Thank you very much for your help,

Best regards,

Martin

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# Choice of steam Turbine/Expander?

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