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<div class="moz-cite-prefix">When I was testing a Rocket Stove back
in the 90s I pulled out the fuel support and tossed chips into a
pile in the back of the stove. It made a nice starved pile with a
good gas cloud and flame on top. Almost all the air became
secondary air. Had there been a down leg or sealed container below
the stove with a small hole in the floor of the Rocket stove that
you could nudge the char into it could have been continuous. Most
striking was the fact that the CO/CO2 ratio was much better than I
could achieve under normal operation.<br>
<br>
Try it.<br>
Alex<br>
<br>
<br>
On 17/09/2012 3:09 AM, mtrevor wrote:<br>
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<div><font face="Arial" size="2">Dear Crispin </font></div>
<div> </div>
<div><font face="Arial" size="2">Thanks for noting this. It was
also clearly illustrated on the stoves list several years back</font></div>
<div><font face="Arial" size="2">in the article on introducing the
Approvecho/Stovetec unit in the Marshall Islands. While the
amount of char produced is small it </font></div>
<div><font face="Arial" size="2">definitely does product char.</font></div>
<div> </div>
<div><font face="Arial" size="2">Michael N Trevor</font></div>
<div><font face="Arial" size="2">Majuro </font></div>
<div><font face="Arial" size="2">Marshall Islands</font></div>
<blockquote dir="ltr" style="PADDING-RIGHT: 0px; PADDING-LEFT:
5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid;
MARGIN-RIGHT: 0px">
<div style="FONT: 10pt arial">----- Original Message ----- </div>
<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color:
black"><b>From:</b> <a moz-do-not-send="true"
title="crispinpigott@gmail.com"
href="mailto:crispinpigott@gmail.com">Crispin
Pemberton-Pigott</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a
moz-do-not-send="true"
title="stoves@lists.bioenergylists.org"
href="mailto:stoves@lists.bioenergylists.org">'Discussion of
biomass cooking stoves'</a> </div>
<div style="FONT: 10pt arial"><b>Sent:</b> Monday, September 17,
2012 3:36 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re: [Stoves] FW:
Need designs</div>
<div><br>
</div>
<div class="WordSection1">
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Dear Ron and
Aron<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'">A Rocket
stove typically makes quite a bit of charcoal and that is
one reason why you should put a grate in, if you plan to
save fuel. The ends of the sticks fall off long before the
charcoal is burned and sit in a pile on the floor of the
combustion chamber. Whatever happens not to burn, is lost
later.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'">If you want
to make additional charcoal put in a grate with a small
number of 8mm holes in it, of 6mm. This will cut off most
primary air and cause the creation of a much larger (about
double) the amount. The Namibian Tsotso is a stove which
is built exactly like that. It creates charcoal so
effectively that towards the end of a WBT it hard to get
additional fuel in because of the pile of char. It could
in theory burn at least some of it but it is not really
set up to do so. If you do add such a grate, it is, by
definition, a not Rocket Stove (which always has
overhanging fuel and air supplied from underneath).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'">The
Institutional Lion Stove, which is basically a Rocket
Stove with preheated primary air, also makes a lot of
char, until it fills the lower combustion chamber. This
then acts as a simmering fuel charge and all the firewood
can be removed. I have seen a stove with a 70 litre pot
simmering for ages (more than an hour) using on this cube
of char what was blocking the primary air entrance up
level to the fuel shelf (which is made of brick).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'">In fact I
found a photo of that very stove which is at an orphan
feeding station in Moneni, Swaziland. There is no firewood
in the chamber at all. The stove saves about 70% of the
fuel in part because of this. If you are wondering what
the metal rings are on the top, the pots are chained to
the stove to prevent them growing legs. They already have
three feet so they tend to go walk-about.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Xavier on
this list has been making similar stoves in Benin. A
complete description of how to make it is in the NDE
library at <a moz-do-not-send="true"
href="http://www.newdawnengineering.com/website/library/Stoves/lionstove/">http://www.newdawnengineering.com/website/library/Stoves/lionstove/</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'">Crispin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt; COLOR:
#1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></span></p>
<p class="MsoNormal"><img id="Picture_x0020_1"
src="cid:part4.03040105.09060400@kingston.net" border="0"
height="296" width="473"><span style="FONT-SIZE: 11pt;
COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="MARGIN-BOTTOM: 12pt"><span
style="COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">Aron:<br>
<br>
Can you clarify your intended design? I know of no
way that you can turn a rocket stove into a char-making
stove (but would love to hear differently).<br>
<br>
Ron.<o:p></o:p></span></p>
</div>
</div>
<p> </p>
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