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<span style="line-height: initial;"><font face="Calibri, Slate Pro, sans-serif, sans-serif">></font></span><span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: initial;">Adjusting the plate makes a lot of sense for that design. It would
be interesting to try. What is the moisture tolerance of the Mayon Turbo? Would it take moderately wet sawdust?</span></div>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">Moisture toleranceCan be adjusted because the fuel is heated by a metal sleeve on the way down. </span></p>
<p><span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: initial;">By adjusting the gap, it's diameter and the angle of the fuel hopper cone the desired temperature can be achieved. </span></p>
<p><span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: initial;">Who has one?</span></p>
<p><span style="font-family: Calibri, sans-serif; font-size: 11pt; line-height: initial;">Crispin </span></p>
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<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">Dear Tom</span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">Thanks for that.</span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">Most people have not used a Mayon Turbo Stove which is a rice hull gasifier. I think it works with lost of small biomass. I investigated its performance for Roger
Samson with two of his interns a few years ago.</span></p>
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<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">What we found was that lowering the plate that holds the fuel ‘up’ (to stop it falling out the bottom) causes the char production to decrease substantially. Elevating
it has the consequence of increasing the char fraction.</span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">It is a clean burning cooking stove, while it makes char on a continuous basis – not a batch like a TLUD. I think it may be worth investigating as a sawdust charcoaler
– it should have an adjustable bottom centre plate so as to be able to control the char fractions as Alex does by changing the speed of the chain grate.</span></p>
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<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">Regards</span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">Crispin</span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Stoves [<a href="mailto:stoves-bounces@lists.bioenergylists.org">mailto:stoves-bounces@lists.bioenergylists.org</a>]
<b>On Behalf Of </b>Tom Miles<br>
<b>Sent:</b> 14-Oct-16 04:08<br>
<b>To:</b> 'Discussion of biomass cooking stoves' <<a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a>><br>
<b>Subject:</b> Re: [Stoves] SPAM: Re: Charcoal from waste - home cooking or other markets? (Re: Crispin, Anand Karve)</span></p>
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<p class="MsoNormal"><span lang="EN-CA"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">A cyclone sawdust gasifier was developed and tested by Jim (JW) cousins in New Zealand in the early 1980s. Google “cyclone gasifier”</span>
<span style="font-size:11.0pt; font-family:"Calibri",sans-serif"><a href="http://pubs.acs.org/doi/abs/10.1021/i200031a063" target="_BLANK">http://pubs.acs.org/doi/abs/10.1021/i200031a063</a></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">There have been various research versions since but nothing commercial.
</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">Jaques Lede worked on a fast pyrolysis cyclone reactor. I suspect that the char yields were pretty low.
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"><a href="https://www.researchgate.net/publication/231393861_The_Cyclone_A_Multifunctional_Reactor_for_the_Fast_Pyrolysis_of_Biomass" target="_BLANK">https://www.researchgate.net/publication/231393861_The_Cyclone_A_Multifunctional_Reactor_for_the_Fast_Pyrolysis_of_Biomass</a></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">Cyclonic pyrolysis and gasification of lighter ag residues in the 1970s and 1980s required recirculation of pyrolysis gases to maintain high mas flow in the reactor while
limiting air or reactive gases. </span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">Tom</span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Stoves [<a href="mailto:stoves-bounces@lists.bioenergylists.org">mailto:stoves-bounces@lists.bioenergylists.org</a>]
<b>On Behalf Of </b>Ken Boak<br>
<b>Sent:</b> Thursday, October 13, 2016 2:53 PM<br>
<b>To:</b> Discussion of biomass cooking stoves <<a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a>><br>
<b>Subject:</b> SPAM: Re: [Stoves] Charcoal from waste - home cooking or other markets? (Re: Crispin, Anand Karve)</span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Andrew & list</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hello again after a few years off.</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I like the high thermal mass cyclone burner idea.</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Pyrolyse the sawdust into char in a micro cyclone ( Think Dyson Root 8, Root 12 technology - but cast in alumina refracory material)</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Char drops into a hopper - pyro gases are separated and go to a burner to keep the cyclones hot.</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">regards</p>
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<p class="MsoNormal">Ken</p>
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<p class="MsoNormal">On 13 October 2016 at 22:19, <<a href="mailto:ajheggie@gmail.com">ajheggie@gmail.com</a>> wrote:</p>
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<p class="MsoNormal">[Default] On Thu, 13 Oct 2016 09:46:26 -0500,Paul Anderson<br>
<<a href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>> wrote:<br>
<br>
>Rebecca, I do not know of any "small, reasonable size" method to make<br>
>raw sawdust directly into charcoal.<br>
<br>
As I said Chardust in Kenya initially did it in a simple down draught<br>
burner.<br>
<br>
<br>
>Of course it can be done in<br>
>scientific laboratories, and probably in some expensive pyrolyzer-style<br>
>large burners at some sawmill that wants heat, or in some fluidized bed<br>
>gasifier that sprays in the sawdust (utilizing its small particle<br>
>size). I hope that somebody has a brilliant idea someday for a small<br>
>inexpensive method, but not being done yet, as far as I know.<br>
<br>
There have been many ways to pyrolyse sawdust, I was told of one where<br>
the sawdust was metered into the exhaust of a diesel generator, I bet<br>
that made some smoke.<br>
<br>
One can envisage a simple vortex burner of high thermal mass being<br>
initially heated up by the sawdust and later the sawdust would<br>
centrifuge to the side and then down whilst the offgas burned in the<br>
upper area, the radiant heat from the walls then further carbonising<br>
the sawdust as it fell.<br>
<br>
Alex has shown how a chip stoker can be set to produce char and make<br>
use of the heat, whether the char produced is marketable is another<br>
matter.<br>
<br>
In the Chardust case it looks like there is still lots of vendor's<br>
waste char fines which is easier picking than making fresh from<br>
sawdust.<br>
<br>
Andrew</p>
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