[Gasification] Exclusion of nitrogen from air

Mark Ludlow mark at ludlow.com
Sun Mar 18 01:07:13 CDT 2012

Dr. Dr. Karve,

Sieves (membranes mostly) have been around a pretty long time. Usually they
provide 99.9% N2. I used them to provide an "inert" blanket for a chemical
reaction. Most liquid gas suppliers (Airgas; Air Liquide; etc.) will put a
system in for you. If you had a need for the N2, then the "waste product" O2
and Ar and other trace elements would come free. But these membranes don't
operate spontaneously. They require a differential pressure. Producing this
may eat-up all of your gains!


Best, Mark


From: gasification-bounces at lists.bioenergylists.org
[mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Anand
Sent: Saturday, March 17, 2012 9:52 PM
To: Discussion of biomass cooking stoves; Discussion of biomass pyrolysis
and gasification
Subject: [Gasification] Exclusion of nitrogen from air


Dear workers of stoves and gasifiers,

when one uses atmospheric air as a source of oxygen, one unnecessarily heats
up the nitrogen in the air. This nitrogen ultimately goes out of the
chimney, taking with it a lot of heat. The technologies based on wood as
fuel are pretty old, but one can revive them, using some of the more recent
techniques. A person who owns a foundry told me that a moleular sieve was
now available for separating nitrogen from oxygen. Has anybody heard of it?
Can it be used in producing a better stove and a better gasifier?



Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)

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