[Stoves] [biochar] Charcoal as space filler in TLUD reactors
Kevin
kchisholm at seaside.ns.ca
Mon May 6 01:17:41 CDT 2013
Dear Paul
----- Original Message -----
From: Paul Anderson
To: Discussion of biomass cooking stoves
Cc: Kevin ; biochar at yahoogroups.com ; James S. Schoner ; Hugh McLaughlin
Sent: Sunday, May 05, 2013 6:33 PM
Subject: Re: [Stoves] [biochar] Charcoal as space filler in TLUD reactors
Kevin,
The "charcoal as filler" is not about consuming the charcoal.
# Sorry, I missed that.
The charcoal is "almost" non-active in the pyrloysis of the new biomass. This is a discussion about limiting air flows with a filler that mostly is inactive in environments that are at 650 C without oxygen.
# Why do you feel it would be advantageous to limit air flow with an inert filler? If the char was significantly larger or smaller than the biomass fuel, it could significantly increase pressure drop through the bed, and would likely reduce maximum flow.
# Thanks.
[ Note that I avoid using the word "inert" in this discussion.]
Best wishes,
Kevin
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: psanders at ilstu.edu Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.comOn 5/5/2013 4:15 PM, Kevin wrote:
Dear Paul
When the "Stove Customer" wants char, then char producing stoves is what he should purchase. If the Stove Customer wants fuel efficiency, then he should purchase a stove that burns the greatest percentage of incoming fuel efficiently.
The energy loss in a char producing stove, assuming the char production of the char producing stove is about 20% of the weight of the incoming fuel, the "energy loss in the char is about 1/3 of the energy in the incoming fuel. Say 33%. Even if the char stove could consume 30% recycled char, with a 10% consumption, the overall effect on efficiency would be about 3%.
Unless there is jiggery-pokery with the figures, a char producing stove will be inherently less efficient than a "full burn stove."
I would suggest that the Testing Protocol be set up with categories of comparable stoves. With the same testing and Reporting protocol, the Customer would have "the Big Picture" and could:
1: Firstly select the Category of stoves that best met his needs
and
2: He could then select the best stove in the category of importance to him.
That's fair.
Best wishes,
Kevin
----- Original Message -----
From: Paul Anderson
To: biochar at yahoogroups.com ; Discussion of biomass cooking stoves ; James S. Schoner ; Hugh McLaughlin
Sent: Sunday, May 05, 2013 5:33 PM
Subject: [biochar] Charcoal as space filler in TLUD reactors
Dear all,
My earlier comments about charcoal as a space filler in TLUD reactors
have been placed at my website.
> http://www.drtlud.com/2013/05/01/dr-tlud-shares-some-tlud-stove-operation-tips/
Tom Miles replied that between 7% and 10% of the charcoal could be
consumed during such a the TLUD batch. I do not have any data on that
(not yet), but I raise some questions:
1. Tom, what percentage of the fuel in your "batch" was biomass and
what percentage was charcoal? A very high percentage of the "fuel" as
charcoal would favor higher percentages of char consumption. If there is
rather little charcoal as filler, even 10% of consumption might be a
small price to pay for being able to use skraggly narly twisted biomass
that does not fill well into TLUD fuel chambers. But the ability to
fill in the excessive space could be very important for biochar makers
who otherwise could need to do considerably more pre-processing of the
fuels. In other words, more "forms" of biomass could be better
accepted into TLUDs for heat and char production.
2. Charcoals are not pure carbon. Some residual volatiles are
present, with more in the chars that were prepared at lower pyrolysis
temperatures. Merely giving a second chance (and more time) for the
volatiles to become gases could result in a different (better?) form of
biochar. If that is the case, then the 10% reduction could be viewed
as an improvement and not as a loss.
3. Please note that the addition of charcoal into the TLUD fuel
chambers was not a topic of discussion. This is new ground and is an
open field for everyone and anyone.
WE NEED SOME DATA ON THIS. I hope that those who are actively producing
biochar will conduct a few simple experiments to help us be better
informed. TLUD users do NOT need to wait for others to get us some
more data. Please contribute whatever experiments you can.
And if you want to work together with others, maybe some of you will
come to one of the Dr TLUD Workshops on Stoves and Biochar this year.
Paul
--
Paul S. Anderson, PhD aka "Dr TLUD"
Email: psanders at ilstu.edu Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
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