[Stoves] Fwd: Smoke-free biomass pellet fueled stove

[Ron Larson]

Lists:

  Prof. Nurhuda has ok'd my forwarding this additional information on his recently announced stove.

Ron


Begin forwarded message:

> From: Muhammad Nurhuda <mnurhuda at gmail.com>
> Date: November 4, 2012 5:01:46 PM MST
> To: rongretlarson at comcast.net
> Subject: Re: [Stoves] Smoke-free biomass pellet fueled stove
> 
> Dear Mr Larson,
> 
> 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
> 
> > Prof. Nurhuda
> > This is a really fine looking stove. The part that intrigues me most is
> 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
> > could be very helpful to others. (Can they control excess air by the
> look
> > of the flame?)
> > A few questions:
> > the price?
> > sales going well?
> > what percentage char by weight?
> > any soil improvement results from using the biochar?
> > can you do more than a 4:3 turndown ratio? (based on your two stated
> power
> > levels)
> > apparently you are striving for biochar (great!), but can you describe
> conditions if you try to burn the produced char?
> > any efficiency data?
> > you appear to be pre-heating both primary and secondary air - can you
> attribute any performance improvement to that? (I know of no-one else
> doing both)
> > Thanks for the alert on your stove.
> > Ron
> > ----- Original Message -----
> > From: mnurhuda at ub.ac.id
> > To: stoves at lists.bioenergylists.org
> > Sent: Saturday, November 3, 2012 5:03:54 PM
> > Subject: [Stoves] Smoke-free biomass pellet fueled stove
> > Dear all,
> > Please check to following page to see the video of our smoke-free,
> biomass-pellet fueled stove:
> > http://www.youtube.com/watch?v=uWt25oD1iWk&feature=youtu.be
> > Kind regards
> > M. Nurhuda
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> for more Biomass Cooking Stoves, News and Information see our web site:
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> 
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