[Gasification] close coupling, Paul Anderson

Mon Oct 9 21:25:00 CDT 2006

Toby,

Excellent question.  And I do not have the answer.  I hope someone else 
can tell
us if we can get higher temperatures if a "tarry gas" is cleaned before it is
combusted.  And if yes, is the increase of temperature really cost effective?

Paul
-- 
Paul S. Anderson, Ph.D., Geography professor - Emeritus
Telephone:  USA-309-452-7072 (residence and office)
Internet site:  www.ilstu.edu/~psanders
For my gasifier stoves info, go to:
http://bioenergylists.org/contributors#Paul_Anderson

Quoting Toby Seiler <seilertechco at yahoo.com>:

> Paul,
>
>  I ask a question when the subject of "clean" gas was recently 
> brought to the gasification list but may not have stated it 
> correctly.  My interest is not making gas for use in internal 
> combustion or turbine direct firing, but creating a cleaner burn in a 
> secondary burn catalyst and recovery of the energy in a boiler.  I 
> hope to be efficient in infrared transfer because of the high delta 
> t.. High temp combustion is desired without high flow.
>
>  The question that I have is; is it advantageous to uncouple gas 
> production from secondary burn and clean it up?  Is condensing out 
> non-combustion matter before a secondary high temp combustion going 
> to lower emissions or acid condensation in the stack condenser?  I'm 
> not a chemist but wonder if "clean" gas is better (and worth the 
> effort) than "dirty" gas!  Please help me decide wether I am a clean 
> or dirty gasifier enthusiast.
>
>  Toby J. Seiler
>
>
>
>
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> 1. Comments about T-LUDs: Close combustion (Paul S. Anderson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 08 Oct 2006 12:15:09 -0500
> From: "Paul S. Anderson"
>
> Subject: [Gasification] Comments about T-LUDs: Close combustion
> To: english at kingston.net, GASIFICATION - Listserve
>
> Cc: stoves at listserv.repp.org
> Message-ID: <20061008121509.jealbq22v40808gs at webmail2.ilstu.edu>
> Content-Type: text/plain; charset=ISO-8859-1; format="flowed"
>
> Alex,
>
> Your comments to the Stoves Listserv are much appreciated and relate
> not just to
> T-LUD gasifiers. Therefore, I am taking this Subject also to the Gasification
> Listserv where it may or may not have gasification discussion. For the Stoves
> Listserv, let's keep to the topic of T-LUDs, and leave the big-size gasifiers
> to the Gasification Listserv discussion. (Please do not cross-post unless you
> are sure that both lists would want your reply.)
>
> Quoting Alex and Christine English :
>>
>> ... the latter senario [with combustion within two feet of the
>> creation of the gases] appears to yield significant reductions in
>> emissions,
>> comparable to systems with greater and more destinct separation
>> between the zones
>> of fuel and burnout.
>>
>> Ironicly, the makers of combustion "gasifiers" have suffered some
>> loss of business by
>> being confused or associated with the poor record of many gasifiers
>> built for engine
>> and turbine use.
>
> At the risk of being too general in these statements below, Paul replies:
>
> 1. The closer the combustion to the gas creation, the emissions are cleaner.
>
> 2. The gasifiers for "combustion" (meaning thermal applications) should be
> evaluated differently (and clearly identified) from the gasifiers for engine
> and turbine use.
>
> 3. The gasifiers for engine and turbine use can, in general, be called CHP
> systems, for Combined Heat and Power. But it is the quest for the P
> (electrical or mechanical power) that dominates the CHP systems. The H (heat)
> is a by-product (a very valuable by-product, but still very much in second
> place to the P of power).
>
> 4. Because the CHP gasifiers (for engine and turbine use) must include
> components that will cool the gases, the distance to the final usage of the
> gases must be greater than is the case for the thermal-application
> gasifiers. Cooling implies risk of condensation of tarry materials, and
> therefore cleaning
> becomes an essential issue. To avoid the cleaning, the "answer" is to create
> the gases without any significant amounts of impurities. A few seem to have
> accomplished this.
>
> 5. There is much gasification action in India currently. But I suspect that
> the issue is to create installations (with much cleaning of the 
> gases) and not
> how to create gases that need minimal cleaning. See:
> http://biopact.com/2006/09/biomass-gasification-systems-to-power.html
> THIS topic is for GAS-L and not for Stoves Listserv.
>
> 6. For the Stovers, the T-LUD gasifiers are about as close-coupled as you can
> get and still be a gasifier device. For low emissions (among the lowest ever
> tested in small stoves), The T-LUDs show clearly that burning the tarry gases
> well is one way to succeed.
>
> Paul
> --
> Paul S. Anderson, Ph.D., Geography professor - Emeritus
> Telephone: USA-309-452-7072 (residence and office)
> Internet site: www.ilstu.edu/~psanders
> For my gasifier stoves info, go to:
> http://bioenergylists.org/contributors#Paul_Anderson
>
>
>
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