<div dir="ltr">Hey all,<div><br></div><div>interesting sketches for the expandable stove, as Richard said, we did some similar designs in Malawi, having 3,4 or 5-sided stove. Here is only a version with 4 but you get the idea</div>
<div><br></div><div><a href="http://holeyroket.files.wordpress.com/2009/07/img_62071.jpg">http://holeyroket.files.wordpress.com/2009/07/img_62071.jpg</a><br></div><div><br></div><div>it was made out of clay, mixed with sawdust+ashes+sand and thrown in a wooden mold</div>
<div><br></div><div><a href="http://holeyroket.files.wordpress.com/2008/06/img_58971.jpg">http://holeyroket.files.wordpress.com/2008/06/img_58971.jpg</a><br></div><div><br></div><div>later we found out its better to glue the walls together - for the durability purposes</div>
<div><br></div><div><a href="http://holeyroket.files.wordpress.com/2008/06/img_60181.jpg">http://holeyroket.files.wordpress.com/2008/06/img_60181.jpg</a><br></div><div><br></div><div>I found the biggest issue was how to accomodate different pot-sizes to provide a snug fit. Then again, the 5-sized stove didnt work so well with briquettes as the briquette-stove fit needs to be well tought-through depending on their size. In this case we had bigger briquettes (cca 16cm in diameter), so 4-walled stove worked best</div>
<div><br></div><div>other issues i though about with this design: </div><div>- is the user the one that modifies the size or there are different 'fixed' versions to buy (and the design serves just for economized manufacturing purposes); </div>
<div>- static durability - is the stove strong enough to hold aggressive nsima-mixing for instance; </div><div>- how to attach the modules together - chemically or phisically (in this concept for mdula, we had different solutions, one being wrapping it with a wire, than surrounding it with clay, where the walls serve as an insulator, then 'gluing' it with clay while the modules are semi-dry. also wrapping them with a metal cilinder (or any kind of recycled metal structure that holds the parts together) as you also suggest there if i get it right</div>
<div><br></div><div>as for the plastics in briquettes - do you have any information what temperature is needed to burn plastics in briquette-formation well? Would be interesting to check out if the roket-stove model as Joshua developed contributes to cleaner burning of plastics comparing to regular briquette-burning in an open fire or other stoves like the jiko. my tests showed significantly lower CO emissions for the elbow/roket construction for briquettes with a hole, but i never tried to test burning plastics :)</div>
<div><br></div><div>good luck to all!</div><div>Rok Oblak </div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Jul 12, 2014 at 11:57 PM, Richard Stanley <span dir="ltr"><<a href="mailto:rstanley@legacyfound.org" target="_blank">rstanley@legacyfound.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div><br></div>Paul, <div><br></div><div>Thanks for the info about the use of PET plastics in briquettes and Kens and Robert briquette bricks <div>
<div> </div><div>We had an interesting discussion about four/ five years ago in this group about the use of plastics in briquettes: Kevin Chisolm and others had reported on the issue of combusting at least, polyethylene as a short chained hydrocarbon. Studies from Scame out o the UK and Sweden, concerning the wiso dom of burning it instead of burying it. </div>
<div> </div></div></div></div><br><div style="word-wrap:break-word"><div><div><div></div><div><br></div><div>Turns out that this type of plastic is relatively "clean burning" and it turns out to also be the main constituent in those ubiquitous whispy two to five (??) liter sized shopping bags. These bags comprise the majority of the very blight we see in all too many depressed economies globally. (They are sarcastically termed the national flower of many developing nations). </div>
<div><br></div><div>As applied to low pressure, wet process of biomass briquetting, about one typical bag (weighing 6 to 8 grams (size wise it would hold two to three liters ) is abou all that can be used per one 130 gram briquette ( 10cm Ø x 7cm height before one begins to encounter binding issues and drying problems. Thats fine though, because two and a half of such briquettes are required per the avdrage family member per day while the average family of 6 such average persons only consumes about two to four bags per day. Using them in briquettes would actually tend to clean up the neighborhood "for free". </div>
<div><br></div><div>In using the bags however , one needs to really shred them into whispy shards ( with a mean Ø of ≤12mm (½") --with torn edges of stringy ganglia-like fibers. </div><div><br></div><div>Anything more solid much less larger or in the case of chopped pet bottles more resistant to deformation, and they will tend to seariously block the migration of moisure out of the briquette in the drying process. I think taht in the case of utilising the PET bottle in said briquetting process at least, it would require chopping grinding them into ≤ 2.5mm (⅛') Ø granules --- much like the feedstock for plastic injection machines---and using them as a granular additive much like rice husks sawdust etc etc..before they could be found useful at least in the low pressure wet process. I can only speculate that if used in higher pressure briquetting operations, they may well melt and flow interstitally, thus acting as a very durable binder… </div>
<div><br></div><div>I will be interested to read the study when you / Robert gain access to it.</div><div><br></div><div>Re the adjustable briquettes for stove wall design, I would ask Rok Oblak to please comment on his earier design out of Malawi as well as Brian and Nancy Davis to comment on the evolution fo same for their COCI Nica stove as it is emerging rapidly in Nicaragua.</div>
<div><br></div><div> </div><div> Thanks again, </div><div><br></div><div>Richard Stanley</div><div>----------</div><div><br></div><div><div><div>On Jul 11, 2014, at 8:18 AM, Paul Anderson wrote:</div><br><div bgcolor="#FFFFFF" text="#000000">
Stovers and briquette folks,<br>
<br>
I thank my infrequent correspondent Robert Haston for an
exceptionally informative message that he allows me to share with
all of you. <br>
<br>
Biggest news (to me) is about the study of the inclusion of plastics
(including PET water bottles) into biomass fuel briquettes!! Link
is given to a scientific study done in Greece. I hope our
briquette and emissions gurus will be making comments.<br>
<br>
I ask Robert to please help find out from his Greek contacts about
the testing of these briquettes in OTHER stoves. I hope that will
include the TLUDs.<br>
<br>
See also the attached about making stove structures. Reminds me of
the low density bricks by Ken Goyer and others that come together
for a hexagon shape, but for only one size of stove. Robert's
design is expandable. Robert, please revise with your suggestion
of possible "lockable angles" (by having specific short straight
segments instead of smooth curve on the ends.) I like it!!!!<br>
<br>
Robert, thanks again for providing this info. This could be
discussed at Stove Camp starting 10 days from now.<br>
<div><br>
If replying to Robert, note that he probably does not subscribe to
the Stoves Listserv, so be sure to include his email address in <br>
the recipients. "Haston, Robert E LTCOL USAF (US)"
<a href="mailto:robert.e.haston.mil@mail.mil" target="_blank"><robert.e.haston.mil@mail.mil></a><br>
<br>
Paul<br>
<pre cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype: paultlud Phone: <a href="tel:%2B1-309-452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website: <a href="http://www.drtlud.com/" target="_blank">www.drtlud.com</a></pre>
<br>
<br>
-------- Original Message --------
<table cellpadding="0" cellspacing="0" border="0">
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<th align="RIGHT" nowrap valign="BASELINE">Subject:
</th>
<td>Paper/biomass fuel, cooking fuel - terrorism link,
potential new stove brick design. (UNCLASSIFIED)</td>
</tr>
<tr>
<th align="RIGHT" nowrap valign="BASELINE">Date: </th>
<td>Tue, 01 Jul 2014 17:58:40 +0000</td>
</tr>
<tr>
<th align="RIGHT" nowrap valign="BASELINE">From: </th>
<td>Haston, Robert E LTCOL USAF (US)
<a href="mailto:robert.e.haston.mil@mail.mil" target="_blank"><robert.e.haston.mil@mail.mil></a></td>
</tr>
<tr>
<th align="RIGHT" nowrap valign="BASELINE">To: </th>
<td><a href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a> <a href="mailto:psanders@ilstu.edu" target="_blank"><psanders@ilstu.edu></a></td>
</tr>
</tbody>
</table>
<br>
<br>
Classification: UNCLASSIFIED<br>
Caveats: NONE<br>
<br>
<div><p class="MsoNormal">Dear Dr. Anderson,<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">You might remember me sending you an email
about mixed plastic/biomass (i.e. waste from remote military
bases) as cook stove fuel.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Since then the university of Athens
expanded on the ASU Biodesign’s meta study. They did burn
tests that proved the concept.
<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Converting Biomass and Waste Plastic to
Solid Fuel Briquettes.
<a href="http://www.hindawi.com/journals/jre/2013/360368/" target="_blank">http://www.hindawi.com/journals/jre/2013/360368/</a><u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Once again I am deployed overseas (Djibouti
Africa). The smoke from poorly operated waste
incinerators/open burn pits (which always seem to get
installed upwind) is the worst I have ever experienced.
<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">The latest twist here is this: Illegal
Charcoal Trade Funding Somalia's Al-Shebab.
<a href="http://allafrica.com/stories/201406261350.html" target="_blank">http://allafrica.com/stories/201406261350.html</a>
You probably already know about the expanding deforestation
due to the growing charcoal trade south of here.
<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Miniaturizing the waste to fuel process
seems reasonable once you get past misplaced fears of burning
plastic. The process is straightforward: pick the cleanest
plastics, combine them in the optimal ratio, and form them
into briquettes or pellets designed specifically for
“mini-incinerator stoves”. This sure looks cleaner than the
“certified safe” burn pits on our bases. Instead of EPA
standards, you only have to beat the emissions of an sheep
dung fire.
<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I guess the next step would be to work on
designing and lab testing custom designed fuels for different
stove types. Aside from the size and shape, I guess the only
other factor is whether it would be best to incorporate the
plastic in the pressing or to hot coat the briquettes/pellets
afterward. This would increase their water resistance.
<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Of course getting the military behind this
would require some expert bona fides. This is a pretty good
location to field something. Our hanger sits right next to the
Army Civil Affairs Company. KBR just got another 53 million
dollars to run the camp. I am sure they are interested in ways
to fix their waste stream problems and polish their tarnished
reputation. Unlike Iraq or Afghanistan, this base is
expanding.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Also, I was thinking of making an
expandable cook stove – like adding rocks to make a campfire
bigger. I came up with a design for cove and bead bricks that
you can strap together like barrel staves. The design (along
with a matching pedestal brick) eliminates the need for
mortar. <u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I attached a simple sketch of a top-down
view. It would probably have a base molded to accept the
bricks. I figure you could add some features (bumps, tabs,
pins, etc.) to lock the bricks at 45 and 60 degree angles. I
am probably missing something, but it looks like an extremely
useful design to me. It would sure be cool to see it adopted.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Feel free to forward this to your cohorts.
<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Thank you for your consideration and all
your great work.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Lt Col Robert Haston<u></u><u></u></p><p class="MsoNormal">303<sup>rd</sup> Expeditionary Rescue
Squadron<u></u><u></u></p><p class="MsoNormal">Camp Lemonier, Djibouti Africa<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p>
</div>
<br>
Classification: UNCLASSIFIED<br>
Caveats: NONE<br>
<br>
<br>
</div>
<br>
</div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><b>Rok Oblak, MAA Design</b><br><br><a href="mailto:rok.stoves@gmail.com" target="_blank">rok.stoves@gmail.com</a><br><a href="http://www.holeyroket.com/" target="_blank">briquettestoves.com</a><br>
<br>Gregorciceva ulica 5<br>4224 Gorenja vas<br>Slovenia<br></div>
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