Back to square one.
I just completed successfully two projects where we used evaporative coolers on the inlet intake of the fin-fan of 8 compressor units (each 2200 HP). We used Munters Inc media, it is working real well. at 18% RH and 100 deg days, we can decrease the air temp. to <75 deg.F.
On this project, Munters would like to install 10 feet transition pieces between the fan and the media, unfortunately, we do have the room for 10' feet; the reason we are looking at other options.
Also, I am investigating an option to reduce the 10 ft to 2 ft by using flow conditioners between the media and the fan. Flow conditioners will look like the registers for you HVAC system in your house.
Thanks George for your input.
Cheers,
> Elie:
> Actually, from what you are saying, the coolers are
> not undersized. A ten degree approach to ambient is
> normal for this type of cooler - I would say you are
> doing all that can be done at high temperatures.
>
> A couple of suggestions that may help. I am working
> with a project on CBM, and have similar problems.
> In my case, the compressor was located a couple of
> miles from the dehydration unit, to allow the gas to
> transfer heat to ground. Quite effective if you
> have enough pipe buried! Alternately, in your case,
> there are a couple of companies in USA that build
> evaporative coolers that attach to an existing
> fin-fan cooler, provide a "skirt" below the fin-fan
> inlet. They can reduce the ambient air temperature
> 10-15 degrees, if relative humidity is low enough.
> Result would be that you could use some of your
> produced water, inject on the evaporative cooler
> section, and get reduced temperature out of the
> existing cooler. I would recommend looking at this
> - could be just what you are wanting for the hot
> days.
>
> George Mckinney
> ----- Original Message -----
> From: elie altawil
> To: <a href="/group/PipingDesign/post?postID=99cRr4X9-nAdEmwGRejWVl4mysMvjuWQspjDtO1f_yyItowlTuZ63MutzJ0GBVBreawBIPfXjVxb52Xag9y0keP9V4A">PipingDesign@yahoogroups.com</a>
> Sent: Thursday, July 21, 2005 3:06 PM
> Subject: Re: [PipingDesign] Compressed Natural Gas
> Cooler
>
>
> Thanks for your reply,
>
>
> I am working for a consultant and I don't know why
> the coolers are undersized. During hot summer days
> when ambient temperature reaches 105+ deg, the
> temperature of the gas exiting the coolers is 115+
> deg. The dehy is about 150 feet from the compressor.
> Relative humidity is ~18% and the station is 7000 ft
> above sea level (asl), P(atm) 11.4 psia.
>
>
>
> The produced water is from coal bed methane and is
> not clean. Fouling the exchanger is a big concern.
> We will have to install filtration (two - 60" dia
> vessels. w/ 5 micron filter elements), and analyze
> & treat the water. The water transfer line passes
> through the station. We will install a block valve
> in the line, and divert the water from the pipeline,
> through the heat exchanger, and back to the
> downstream side of the block valve of the pipeline.
>
>
>
>
>
> The question I have: did nyone implemented this
> approach successfully?
>
>
> George McKinney <gmckinney@augustaeng.com> wrote:
> Elie:
> Some comments on your question about natural gas
> cooling:
> If I understand what you are saying, you would
> like to add a gas to water aftercooler downstream of
> the existing fin-fan compressor coolers, using your
> available produced water as the cooling medium. If
> so, there should be a good number of available
> manufacturers for this type of exchanger. GEA is
> one company that comes to mind, but if you search
> the web for "shell and tube heat exchangers" you
> will get a number of sources. Or, check Compressor
> Tech2 - Compression Technology Sourcing Supplement -
> would probably give you a number of sources.
>
> Comments:
> First of all, why are your aftercoolers undersized
> - were they properly sized, what is your ambient air
> temperature, has compressor suction/discharge
> changed increasing discharge temperature, are
> coolers needing cleaning? Generally, determine if
> you really need the new cooler.
> Second, what is the BTU/hr load of the gas that
> you are rejecting - it is going to go to your water,
> and then what? What will be the temperature of the
> effluent water? Do you have a discharge that will
> not be affected by the increased temperature of the
> water?
> And, what is the content of your produced water?
> Is it really just water, or does it have salt and
> pipeline liquids? Will it foul the cooler when you
> go circulating?
>
> It sounds like you have a reasonable approach, but
> a number of details need resolved.
>
> George McKinney
> ----- Original Message -----
> From: elie altawil
> To: <a href="/group/PipingDesign/post?postID=99cRr4X9-nAdEmwGRejWVl4mysMvjuWQspjDtO1f_yyItowlTuZ63MutzJ0GBVBreawBIPfXjVxb52Xag9y0keP9V4A">PipingDesign@yahoogroups.com</a>
> Sent: Thursday, July 21, 2005 10:07 AM
> Subject: Re: [PipingDesign] Compressed Natural
> Gas Cooler
>
>
>
> The Problem:
>
> This plant has 4 recip compressor units and 4
> TEG dehydration units. The finfan coolers on the
> compressors are undersized and the gas outlet
> temperature from the finfans exceeds the dehy unit
> design inlet gas temperature of 100 deg F, resulting
> in gas to the pipeline with >7 lb/mmscf water
> content. On site we have available >2500 bbl/day of
> produced water at 70 deg F. Plant normal output is
> 60 MM @ 400 psig.
>
> We are looking at several option, one of which
> is installing a gas cooler with water pumps instead
> of fans, all what we need .
>
> The Request
>
> 1. Anyone implemented this approach
> successfully?
>
> 2. We are looking at decreasing the gas temp
> from 120 deg F to 95 deg. F?
>
> 3. I am looking for a ASME Certified
> design/fabricator in the USA only?
>
> Thank a lot. ET.
>
>
>
>
>
>
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