<div dir="ltr">Hi All,<div><br></div><div>Tonight, the evening temperatures in the UK demanded a bit of extra heating.</div><div><br></div><div>Not having any firewood available at the moment for my woodstove and back boiler - I went to my local superstore on my way home from work and parted with $6 for a 10kg pack of 12 sawdust briquettes.</div><div><br></div><div><a href="http://www.tesco.com/direct/fuel-express-long-burning-heat-logs-12-pack/203-4633.prd?source=others">http://www.tesco.com/direct/fuel-express-long-burning-heat-logs-12-pack/203-4633.prd?source=others</a><br></div><div><br></div><div>These are 64mm "octagons" length 230mm and with a 20mm hole through the centre. Mass is 800g per "log"</div><div><br></div><div>Colour is a shiny dark chocolate exterior skin where they have been hot an extruded under pressure.</div><div><br></div><div>They light easily and soon burn efficiently. In 3 hours - I burned 6 of them.</div><div><br></div><div>At $0.50 each - they are a bit pricey compared to other fuels - but you can buy a pallet of 1 ton for (1000 pieces) for about $370 bringig them down to $0.37.</div><div><br></div><div>If you go on Alibaba - you will find this product for about $80 - $120 per tonne.</div><div><br></div><div>Specification is here</div><div><br></div><div><a href="https://www.bioglow.co.uk/woodmix-pini-kay-briquettes">https://www.bioglow.co.uk/woodmix-pini-kay-briquettes</a><br></div><div><br></div><div><br></div><div>Hopefully this weekend I will be able to do a controlled pyrolisation of some of these - and see what the char is like. I have a 100mm diameter bore, temperature controlled tubular electric furnace that heats to 1200C - as used by semiconductor industry.</div><div><br></div><div>Stay warm,</div><div><br></div><div>Ken </div><div><br></div><div>london</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 13 October 2016 at 23:14, Crispin Pemberton-Pigott <span dir="ltr"><<a href="mailto:crispinpigott@outlook.com" target="_blank">crispinpigott@outlook.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Andrew and All<br>
<br>
There are two serious wastes of char fines available everywhere: at the<br>
point of production (because no one wants to transport unsaleable fines) and<br>
at the point of retail. Cecil Cook reported on the value chain and where<br>
everything went when he studied Maputo for ProBEC. Reports are available I<br>
am sure.<br>
<br>
Regards<br>
<span class="HOEnZb"><font color="#888888">Crispin<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
<br>
[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 the<br>
sawdust was metered into the exhaust of a diesel generator, I bet that made<br>
some smoke.<br>
<br>
One can envisage a simple vortex burner of high thermal mass being initially<br>
heated up by the sawdust and later the sawdust would centrifuge to the side<br>
and then down whilst the offgas burned in the upper area, the radiant heat<br>
from the walls then further carbonising the sawdust as it fell.<br>
<br>
Alex has shown how a chip stoker can be set to produce char and make use of<br>
the heat, whether the char produced is marketable is another matter.<br>
<br>
In the Chardust case it looks like there is still lots of vendor's waste<br>
char fines which is easier picking than making fresh from sawdust.<br>
<br>
Andrew<br>
<br>
______________________________<wbr>_________________<br>
Stoves mailing list<br>
<br>
to Send a Message to the list, use the email address<br>
<a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.<wbr>org</a><br>
<br>
to UNSUBSCRIBE or Change your List Settings use the web page<br>
<a href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists
.org" rel="noreferrer" target="_blank">http://lists.bioenergylists.<wbr>org/mailman/listinfo/stoves_<wbr>lists.bioenergylists<br>
.org</a><br>
<br>
for more Biomass Cooking Stoves, News and Information see our web site:<br>
<a href="http://stoves.bioenergylists.org/" rel="noreferrer" target="_blank">http://stoves.bioenergylists.<wbr>org/</a><br>
<br>
<br>
______________________________<wbr>_________________<br>
Stoves mailing list<br>
<br>
to Send a Message to the list, use the email address<br>
<a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.<wbr>org</a><br>
<br>
to UNSUBSCRIBE or Change your List Settings use the web page<br>
<a href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org" rel="noreferrer" target="_blank">http://lists.bioenergylists.<wbr>org/mailman/listinfo/stoves_<wbr>lists.bioenergylists.org</a><br>
<br>
for more Biomass Cooking Stoves, News and Information see our web site:<br>
<a href="http://stoves.bioenergylists.org/" rel="noreferrer" target="_blank">http://stoves.bioenergylists.<wbr>org/</a><br>
<br>
</div></div></blockquote></div><br></div>