I have a 6" waste water line (90 GPM) that passes by the plant. I am planning to divert the water through the heat exchanger and send it back to where it was going.
Cheers,
> Elie:
>
> You provide the needed process information, but
> nothing on the heat
> exchanger except that it is a sheel and tube. I can
> make assumptions as
> to design, materials, tube size and pitch,
> thicknesses, etc., but the
> results are not terribly representative. You could
> probably get a
> smaller flow if you can go to a plate exchanger, but
> you might have a
> larger pressure drop (but no indication of the
> pressure of the water, or
> on the pump). In general, you will have a lot of
> water use, as your
> LMTD is pretty small, assuming an approach of 10 deg
> F. Typically the
> water is reused (using a cooling tower), abnd
> especially effective at
> that altitude (rarely at that elevation is there a
> high relative
> humidity or absolute dew point - you can probably
> count on getting a 70
> deg or cooler water out of the tower, as the dew
> point is probably less
> than 50 - 55 deg F at any time).
>
> The answer is, yeah, you'll be using a lot of water.
> You can do some
> engineering design to minimize it, and add a CT to
> minimize operating
> cost (you might have to reuse water anyway, because
> getting a permit to
> use and discharge that much water is either costly
> or impossible, or
> somewhere in bewteen).
>
> ... Bruce D. Bullough ...
> Sebesta Blomberg &
> Associates, Inc.
> 2381 Rosegate
> Roseville, MN 55113
> USA
> desk: 651-634-7344 fax:
> 651-634-7400
> www.sebesta.com
>
>
> -----Original Message-----
> From: PipingDesign@yahoogroups.com
> [mailto:PipingDesign@yahoogroups.com]
> On Behalf Of elie altawil
> Sent: Friday, September 09, 2005 6:03 PM
> To: PipingDesign@yahoogroups.com
> Subject: [PipingDesign] Water volume require to cool
> natural gas
> [bcc][faked-from][mx][spf]
>
>
> The problem:
>
> I need to cool natural gas from 130 deg F to 110
> deg F using a shell &
> tube heat exchanger with 70 deg F water.
>
> Question: How much water do I need?
>
>
>
> Design conditions:
>
> Ambient Temp: 100 deg. F .
>
> Altitude: 6700 ft, atmospheric pressure 11.6 psia
>
> Process Gas: Natural gas, sweet, 95 % methane, 2%
> CO2, specific gravity
> 0.55-0.60, 46 ,000,000 scf/day ( 90,000 lb/hr) , 130
> deg F, operating
> 350 -545 psi, Relief valve set at 500 psig .
>
> Cooling Medium: Produced water,80-90 psig, 70 deg F,
> specific gravity
> 1.04.
>
>
>
> I am piping/pipeline facilities engineer (not a
> process engineer).
>
> I have requested information from a heat exchanger
> vendor. The flow rate
> of water required per vendor calculation is very
> high. I have ran hand
> calculations and compared my answer with the online
> calculation
> available at http://www.freecalc.com/hxfram.htm. The
> vendor reported
> flow rate is 3 times higher than what I came up with
> (hand calc &
> freecalc).
>
>
>
> Supported formulas with your reply are very much
> appreciated.
>
>
>
> Cheers,
>
>
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