[Stoves] grate effect? (was Re: ND-TLUD Burners at ETHOS -- What Works Best?)

[Tom Miles]

Dave,

Michael Johnson, Berkeley Air, detected that startup surge when measuring black carbon. You should see it in the presentations when they are online. (Berkeley Air Monitoring Group, Michael Johnson: Platform for Integrated Cookstove Assessment)

Tom 

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of David Young
Sent: Friday, February 05, 2016 10:23 AM
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org>
Subject: [Stoves] grate effect? (was Re: ND-TLUD Burners at ETHOS -- What Works Best?)

On Thu, Feb 04, 2016 at 09:25:51PM -0700, Ronal W. Larson wrote:
> 	7.  “Big” spikes for both CO and particulates - often (usually) appear as the pyrolysis front reaches the bottom.  - But not always. Why?

Maybe this has something to do with the "grate effect" ? Someone on the list has explained before that the pyrolysis front has no fuel to heat and dry at the bottom of the chamber.  Rather, the grate absorbs the heat of the pyrolysis front and radiates it back into the remaining fuel.  That leads to a big increase in woodgas production.  Starting a few minutes before the fuel burns out, my tincanium TLUDs produce a tall flame that touches the pot, leaving a lot of soot.  I believe that is the grate effect at work.

Dave

--
David Young
dyoung at pobox.com    Urbana, IL    (217) 721-9981

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