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<DIV>Hello Michael,</DIV>
<DIV>Thank you for your suggestions and question. My comments are as
follows:</DIV>
<DIV>1. I have considered experimenting with high silicate ash from the
foot of Mt. Canlaon, in northern part of Negros Oriental. The ash is
free and my partners with the 11th IB of the Philippine Army in Negros Or. and
the Memorial Elementary School in Canlaon would bring the ash to Dumaguete
City. If this does not work, I’ll follow up on the TLUD route.</DIV>
<DIV> </DIV>
<DIV>2. Jon & Flip Anderson (Aprovecho volunteers) have shown me their
work with insulating bricks to form the combustion chamber in Timor Leste.
The insulating bricks are weak, fragile bricks which require a strong, heavy
duty shell exterior (e.g. cement)to protect the combustion chamber and to
support big cooking pots. I still think that tiny insulating “clay
marbles” between the heavy duty, all clay, fired kalan and combustion chamber is
the most practical way to pursue. I am hopeful Rolf and ECOWORXX can find
a way to produce these insulating clay marbles or pebbles cheaply.</DIV>
<DIV> </DIV>
<DIV>3. For those who have not seen a coconut husk – it is a by-product of COPRA
(mature coconut meat) production. Every 3 months, the coconuts are
harvested, cut into 2 halves, and meat is extracted and dried to make
copra. The husk and inside shell is dried in roof-covered sheds or
storage buildings to make “bucong” – the fuel we use to fire the eco-kalans
to 900 degrees Celsius. To use the “bucong” or coconut husk with
shell for fuel in a rocket stove, it is requires chopping the husk with a
machete into narrow wedges (like a cantaloupe) and a combustion chamber
opening as wide and as high (5.5”x5.5”) as that of the eco-kalan.</DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt tahoma">
<DIV><FONT size=3 face=Calibri>Rebecca Vermeer</FONT></DIV>
<DIV><FONT size=3 face=Calibri>Eco-Kalan Project in the Philippines</FONT></DIV>
<DIV><FONT size=3 face=Calibri>British Columbia, Canada</FONT></DIV>
<DIV><FONT size=3 face=Calibri></FONT> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=mtrevor@ntamar.net
href="mailto:mtrevor@ntamar.net">mtrevor</A> </DIV>
<DIV><B>Sent:</B> Friday, June 14, 2013 1:44 AM</DIV>
<DIV><B>To:</B> <A title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Discussion of biomass cooking
stoves</A> </DIV>
<DIV><B>Subject:</B> Re: [Stoves] : Re: Insulation and stove
life</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">
<DIV><FONT size=2 face=Arial>Rebecca </FONT></DIV>
<DIV><FONT size=2 face=Arial>Why not gassify rice hulls in a TLUD and then use
the low cristobalite "tough" high silicate ash to mix your insulation.
</FONT></DIV>
<DIV><FONT size=2 face=Arial>Perhaps take a lead fom Aprovecho's play book and
fire your liner in multiple wedge shaped pieces negating the need to
break</FONT></DIV>
<DIV><FONT size=2 face=Arial>things up. </FONT></DIV>
<DIV> </DIV>
<DIV>How do to "prepare" your coconut husks for use in a rocket stove? </DIV>
<DIV> </DIV>
<DIV>Michael N Trevor</DIV>
<DIV>Marshall Islands</DIV>
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<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=ravermeer@telus.net href="mailto:ravermeer@telus.net">Rebecca A.
Vermeer</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=paul.olivier@esrla.com
href="mailto:paul.olivier@esrla.com">Paul Olivier</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=jonnygms@gmail.com
href="mailto:jonnygms@gmail.com">Jon Anderson</A> ; <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, June 14, 2013 8:25 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] : Re: Insulation
and stove life</DIV>
<DIV> </DIV>
<DIV dir=ltr>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>Paul,</DIV>
<DIV>I currently use wood ash as insulating material between the kalan
and combustion chamber of the eco-kalan (a rocket stove using wood, charcoal,
coconut husk, shell, fronds and other parts of the coconut tree). The
eco-kalan uses 75-85% less firewood and therefore a lot less ash is produced
compared to traditional kalans and other traditional cookstoves in Negros
Oriental, Philippines. A shortage in supply of ash is one fact
<DIV> </DIV>or which affects sales of eco-kalan.
I have considered making an insulating material using a
50-50 mix by volume of rice hull & clay in the form of pellets or bricks
which would be broken to pieces after firing. I would fire the pellets
or the bricks along with the eco-kalans up to 900 degrees Celsius. Will
there be significant formation of cristobalite under these conditions?
Would handling the fired pellets or the breaking of the bricks be a health
hazard? Thanks,</DIV>
<DIV> </DIV>
<DIV>Rebecca Vermeer</DIV>
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=paul.olivier@esrla.com
href="mailto:paul.olivier@esrla.com">Paul Olivier</A> </DIV>
<DIV><B>Sent:</B> Friday, June 14, 2013 12:07 AM</DIV>
<DIV><B>To:</B> <A title=ravermeer@telus.net
href="mailto:ravermeer@telus.net">Rebecca A. Vermeer</A> </DIV>
<DIV><B>Cc:</B> <A title=jonnygms@gmail.com
href="mailto:jonnygms@gmail.com">Jon Anderson</A> ; <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</A>
; <A title=larryw@gotsky.com href="mailto:larryw@gotsky.com">larry
winiarski</A> </DIV>
<DIV><B>Subject:</B> Re: Fw: [Stoves] : Re: Insulation and stove
life</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">
<P>Rebecca,</P>
<P>If we directly burn river hulls, there should be a lot of cristobalite
formed. If we gasify, this problem should be minimized, provided channeling
does not occur. Also there might be cristobalite in the particulate matter in
the combustion gases. With rice hull pellets in a TLUD we have a lot
less channeling, and a lot less particulate matter. Therefore the rice hull
pellet becomes an attractive fuel for these and many other reasons.</P>
<P>Thanks.<BR>Paul Olivier</P>
<DIV class=gmail_quote>On Jun 14, 2013 1:44 PM, "Rebecca A. Vermeer" <<A
href="mailto:ravermeer@telus.net">ravermeer@telus.net</A>> wrote:<BR
type="attribution">
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'">
<DIV>Hello Paul,</DIV>
<DIV>Larry just told me that the silica content of rice hull ash is over
90%. At the ETHOS 2013 Conference, I saw a TURBO stove developed in
the Philippines which used rice hull for fuel. Given your comment
below regarding cristobalite “which is a nasty carcinogen” and severely
hazardous to human health (see link below), would you recommend the use
of rice hull as a household fuel for cookstoves? </DIV>
<DIV> </DIV>
<DIV>Rebecca Vermeer</DIV>
<DIV> </DIV>
<DIV>CRISTOBALITE LINK:</DIV>
<DIV><A title=http://nj.gov/health/eoh/rtkweb/documents/fs/1657.pdf
href="http://nj.gov/health/eoh/rtkweb/documents/fs/1657.pdf"
target=_blank>http://nj.gov/health/eoh/rtkweb/documents/fs/1657.pdf</A></DIV>
<DIV>
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<DIV>
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline"><B>From:</B>
<A title=paul.olivier@esrla.com href="mailto:paul.olivier@esrla.com"
target=_blank>Paul Olivier</A> </DIV>
<DIV style="FONT: 10pt tahoma">
<DIV style="BACKGROUND: #f5f5f5">
<DIV><B>Sent:</B> Wednesday, June 12, 2013 12:01 AM</DIV>
<DIV><B>To:</B> <A title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org" target=_blank>Discussion of
biomass cooking stoves</A> </DIV>
<DIV><B>Subject:</B> Re: [Stoves] : Re: Insulation and stove
life</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">
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<DIV>
<DIV>
<DIV>
<DIV>Paal,<BR><BR></DIV>One thing I look for on my burner is that all burner
holes support a flame throughout the process. If channeling occurs during
the process or if char is being burned as the process comes to a close, then
one can see burner holes that do not support a flame. This means that CO2 is
being discharged from the burner holes, and of course CO2 does not burn.
When CO2 is formed, this represents a big inefficiency, since combustion
takes place far below the pot. When this happens the sides of the reactor
can easily turn red hot and melt. I do not know how it is possible to spot
the presence of CO2 if the top of the reactor stays open and does not have a
lid with burner holes.<BR><BR></DIV>If one turns up the fan a bit too high
resulting in channeling, it can happen that only a few holes (among a total
of 80 in my case) do not support a flame. If I turn the fan down a bit and
shake the reactor, this problem is immediately corrected. Also the effect of
the presence of CO2 can be spotted by the cook in another way. The
distribution of heat to the pan is not even.<BR><BR></DIV>
<DIV>Also many of the positive characteristics of biochar are lost when
biochar is combusted and is reduced to ash. The combustion of biomass and
biochar takes place when channeling occurs, and the combustion of biochar
takes place if the fan is not turned off at the end of the process. Rice
hull ash and rice hill biochar are not at all the same thing when it comes
to growing plants. <FONT color=#ff0000>Also rice hull ash can easily contain
cristobalite, which is a nasty carcinogen. Under ordinary conditions, no
farmer should be handling this stuff.<BR></FONT></DIV>
<DIV><FONT color=#00ff00></FONT> </DIV>Thanks.<BR></DIV>Paul<BR>
<DIV class=gmail_extra><BR><BR>
<DIV class=gmail_quote>On Wed, Jun 12, 2013 at 1:06 PM, Paal Wendelbo <SPAN
dir=ltr><<A href="mailto:paaw@online.no"
target=_blank>paaw@online.no</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
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<DIV dir=ltr>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'">
<P class=MsoNormal style="MARGIN: 0cm 0cm 10pt; LINE-HEIGHT: 13pt"><SPAN
lang=EN-US><FONT style="FONT-SIZE: 11pt">Ron</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 10pt; LINE-HEIGHT: 13pt"><SPAN
lang=EN-US><FONT style="FONT-SIZE: 11pt">By end of flame the color of the
char is red to yellow, that indicate a temperature of 700 to 800 ˚C and
when there is no smoke, complete combustion has taken place. Is that not
good for biochar?</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 10pt; LINE-HEIGHT: 13pt"><SPAN
lang=EN-US><FONT style="FONT-SIZE: 11pt">Regards Paal
W</FONT></SPAN></P></DIV></DIV></DIV><BR>_______________________________________________<BR>Stoves
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clear=all><BR>-- <BR>Paul A. Olivier PhD<BR>26/5 Phu Dong Thien
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