[Gasification] sidebar Ideal Gas Law for engineering

[Mark Ludlow]

Hi Toby,

I think I see what you mean by the "balloons". So I would ask this question:
"If a mixture of gases (as represented by the 'normal' Earth's atmosphere)
would stratify as you suggest, wouldn't one expect the atmosphere to have a
different composition at every discrete altitude?" Or: "Wouldn't all the CO2
have suffocated us by now, even if it is only 0.035% of the atmosphere? (If
the atmosphere were 100,000 ft thick, that would still be 35-feet.)"

 

Intended to be a thought experiment. Sometimes though experiments can save
time and money.

Best regards, Mark

 

From: gasification-bounces at lists.bioenergylists.org
[mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Toby
Seiler
Sent: Saturday, March 05, 2011 3:54 PM
To: gasification at lists.bioenergylists.org
Subject: [Gasification] sidebar Ideal Gas Law for engineering

 


Daniel and all,

 

That's a great explanation and helps a lot.  I see the proportionality in
relation to absolute pressure and temperature.  It validates use of an
inter-cooler and away from heated incoming air, even into ones gasifier, I
believe, as far as putting oxygen into the device.  

 

I'm speculating here, but thinking of making and trying an oxygen enhancing
low pressure system, from lots of long tubular balloons? Oxygen, being a
slight bit lighter than nitrogen, could be taken from the low point, and
since under pressure, have some portion of the rejected nitrogen and
combined air-nitrogen discharged through an orifice at the high point.  

 

I see at the end of your post that air, with gasoline fuel at 12-1 and 15-1
ratio, has 2.4 and 3 lbs of oxygen per pound of fuel respectfully (rounding
to 20% O/air).   Isn't the target ratio of producer gas to oxygen one to one
in an IC engine?  Or is that 1lb air, thus 1/5 the oxygen or a 5-1 ratio for
producer gas to air?  The car guys are generally using a 50% air and 50%
producer gas ratio, which would seem to validate the 5-1 ratio of gas to
oxygen by weight. 

 

I'm sure with the numbers you provided I can figure flow rates at each
stage.  I will verify my flow so sizing is correct before cutting/welding.
I purchased some 4" and 6" dia 304 stainless pipe at a salvage company and
have a SS air tank for some of the hot section heat recovery from the second
stage reactor (and I think enough for a steam superheater... part of final
gas cooling).   

 

Gas out starts at about 1800f from the x-flow reactor, as gas from stage one
is burned and reformed into synthesis gas going through the char bed.  The
gas outlet is direct coupled to the heat recovery, flowing first to heat
stage one incoming fuel, then to a steam superheater and then to a water
boiler.  It's a CHP arrangement, since massive amounts of heat have to be
removed in prooducer-synthesis (prosyn) gas cooling.    

 

Thanks for your explanation.  Mole remains a small fuzzy creature.

 

Toby 

Seilertechco

 

  

 

 

 

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