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How Much Work Does Steam Do Drying Water?

11/10/2010 8:02 AM

I have a question regarding a steam sludge dryer operating with 200 lbs of steam and the amount of water it can evaporate, or work that it can do.

It has been a while since I've done thermodynamic analysis (3 years out of B.S. MET now).

Could anyone point me down the right path or to the right equation to give my manager what he's asking for? The purpose is for designing a scrubber for the exhaust system of this thing. Thanks in advance.

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Guru
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#1

Re: How Much Work Does Steam Do Drying Water?

11/10/2010 2:19 PM

Is that 200 lb/hr of steam?

Or is it 200 psi, and if so, then how many lb/hr?

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#2

Re: How Much Work Does Steam Do Drying Water?

11/10/2010 2:35 PM

After refreshing myself on enthalphy of saturated steam...

It is 200lb/hr of steam at 15 psig.

This gives 232,000 BTU/hr with an enthalphy of steam at 1163.5 BTU/hr

While I haven't solved for sensible heat to bring the water to boiling temperature because I don't know the starting temperature, I know that with the available energy of 232,700 BTU/hr I can vaporize 241 pounds of water per hour.

What I am trying to determine now is how much volume 1 pound of water vaporized takes up at 212*F and 1 atmosphere of pressure.

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#3
In reply to #2

Re: How Much Work Does Steam Do Drying Water?

11/10/2010 2:41 PM

I don't have a steam table in front of me, but that can probably be found on line, and will have that info.

I'm not sure about 100% efficiency of heat exchange, so maybe it might evaporate ~200 lb/hr. However, 241 is conservative for estimating the scrubber requirement.

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#4
In reply to #3

Re: How Much Work Does Steam Do Drying Water?

11/10/2010 3:31 PM

Thanks for the support.

So I ended up taking the density of water at 212*F and of steam at 212*F and atmospheric pressure coming up with a total volume of steam from 241 pounds per water to be around 6500 Ft^3.

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#5
In reply to #4

Re: How Much Work Does Steam Do Drying Water?

11/10/2010 4:04 PM

That checks out; 26.780 ft3/lb x 241 lb/hr ≈ 6455 ft3/hr.

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#6
In reply to #5

Re: How Much Work Does Steam Do Drying Water?

11/10/2010 4:22 PM

Thanks, and to think it took me all day to realize what path to go down. I guess if you don't use it, you lose it.

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