<html><head></head><body bgcolor="#FFFFFF"><div><br>Lists:</div><div><br></div><div> Prof. Nurhuda has ok'd my forwarding this additional information on his recently announced stove.</div><div><br></div><div>Ron<br><br></div><div><br>Begin forwarded message:<br><br></div><blockquote type="cite"><div><b>From:</b> Muhammad Nurhuda <<a href="mailto:mnurhuda@gmail.com">mnurhuda@gmail.com</a>><br><b>Date:</b> November 4, 2012 5:01:46 PM MST<br><b>To:</b> <a href="mailto:rongretlarson@comcast.net">rongretlarson@comcast.net</a><br><b>Subject:</b> <b>Re: [Stoves] Smoke-free biomass pellet fueled stove</b><br><br></div></blockquote><blockquote type="cite"><div><pre>Dear Mr Larson,<br><br>Thank a lot for your email. The stove is my recent attempt in order
biomass pellet can be well burnt. Previously, I developed stove fueled wit
palm kernel shell. Even the stove was excellent for palm kernel shell, but
it is not immediately good for biomass pellet. There are a lot of things
that have to be optimized.
Yes, the excess air can be seen from the appearance of the flame. Optimal
secondary air would produce very transparent,short flame, though it must
not be blue...... Mr Crispin Pemberton Pigott has witnessed the stove
as I demonstrated it in Yayasan Dian Desa, last October.
I just started to sell this pellet stoves. At the moment, I got purchasing
order of 1200 stoves. It occurs after the buyer perform test by himself.
However, due to limited capacity of our workshop, the buyer must wait up
to 3 months right now. At the moment, we are manufacturing 1600
chopped-wood fueled stoves for project in Sumba Island, Indonesia.
The percentage of charcoal by weight is 20-25%. Some time it is less. But
certainly, our stove burns the smoke very well until the last smoke
production.
Biochar is char that contains volatile matter (VM) less then 3%. When the
VM is still high, let say 5%, the reaction of VM and water can lead the
acidic soil condition, and it is not good for the plant. We believe that
the biochar produced by combustion of our stove is VM-free, such that it
is good for soil conditioner.
As you might know, my background is a theoretical atomic and laser
physicist. I do not know some specific terms like turn-down ratio. I
started to develop stoves in the late 2008. In addition, I do not have
laboratory, just small workshop that produces the stoves. So far, the
performance tests are performed by external laboratories. In 2010 test
performed by PT Puser Bumi in cooperation with directory of bioenergy,
republic of Indonesia, our wood chopped stoves was the best among other 60
stoves.
Kind regards
M. Nurhuda
<font color="#800000">> Prof. Nurhuda</font>
<font color="#800000">> This is a really fine looking stove. The part that intrigues me most is</font>
that you are controlling secondary air for the pyrolysis gases. And
apparently doing it (and primary air) well with the rotating disc
mechanism. I do not recall seeing any other stove controlling both
(without a fan) - so any data on the value of that for users of the stove
<font color="#800000">> could be very helpful to others. (Can they control excess air by the</font>
look
<font color="#800000">> of the flame?)</font>
<font color="#800000">> A few questions:</font>
<font color="#800000">> the price?</font>
<font color="#800000">> sales going well?</font>
<font color="#800000">> what percentage char by weight?</font>
<font color="#800000">> any soil improvement results from using the biochar?</font>
<font color="#800000">> can you do more than a 4:3 turndown ratio? (based on your two stated</font>
power
<font color="#800000">> levels)</font>
<font color="#800000">> apparently you are striving for biochar (great!), but can you describe</font>
conditions if you try to burn the produced char?
<font color="#800000">> any efficiency data?</font>
<font color="#800000">> you appear to be pre-heating both primary and secondary air - can you</font>
attribute any performance improvement to that? (I know of no-one else
doing both)
<font color="#800000">> Thanks for the alert on your stove.</font>
<font color="#800000">> Ron</font>
<font color="#800000">> ----- Original Message -----</font>
<font color="#800000">> From: <a href="http://webmail.ub.ac.id/src/compose.php?send_to=mnurhuda%40ub.ac.id">mnurhuda@ub.ac.id</a></font>
<font color="#800000">> To: <a href="http://webmail.ub.ac.id/src/compose.php?send_to=stoves%40lists.bioenergylists.org">stoves@lists.bioenergylists.org</a></font>
<font color="#800000">> Sent: Saturday, November 3, 2012 5:03:54 PM</font>
<font color="#800000">> Subject: [Stoves] Smoke-free biomass pellet fueled stove</font>
<font color="#800000">> Dear all,</font>
<font color="#800000">> Please check to following page to see the video of our smoke-free,</font>
biomass-pellet fueled stove:
<font color="#800000">> <a href="http://www.youtube.com/watch?v=uWt25oD1iWk&feature=youtu.be" target="_blank">http://www.youtube.com/watch?v=uWt25oD1iWk&feature=youtu.be</a></font>
<font color="#800000">> Kind regards</font>
<font color="#800000">> M. Nurhuda</font>
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