Tony,
VERY interesting. New to me.
This from Wikipedia about Thermite
Thermite (/ˈθɜːrmaɪt/<en.wikipedia.org/wiki/Help:IPA/English>)[1]<en.wikipedia.org/wiki/Thermite#cite_note-1> is a pyrotechnic composition<en.wikipedia.org/wiki/Pyrotechnic_composition> of metal powder<en.wikipedia.org/wiki/Powder_metallurgy>, which serves as fuel<en.wikipedia.org/wiki/Fuel>, and metal oxide<en.wikipedia.org/wiki/Metal_oxide>. When ignited by heat, thermite undergoes an exothermic<en.wikipedia.org/wiki/Exothermic> reduction-oxidation<en.wikipedia.org/wiki/Redox> (redox) reaction. Most varieties are not explosive, but can create brief bursts of heat and high temperature in a small area. Its form of action is similar to that of other fuel-oxidizer mixtures, such as black powder<en.wikipedia.org/wiki/Gunpowder>.
Thermites have diverse compositions. Fuels include aluminium<en.wikipedia.org/wiki/Aluminium>, magnesium<en.wikipedia.org/wiki/Magnesium>, titanium<en.wikipedia.org/wiki/Titanium>, zinc<en.wikipedia.org/wiki/Zinc>, silicon<en.wikipedia.org/wiki/Silicon>, and boron<en.wikipedia.org/wiki/Boron>. Aluminium is common because of its high boiling point<en.wikipedia.org/wiki/Boiling_point> and low cost. Oxidizers include bismuth(III) oxide<en.wikipedia.org/wiki/Bismuth(III)_oxide>, boron(III) oxide<en.wikipedia.org/wiki/Boron(III)_oxide>, silicon(IV) oxide<en.wikipedia.org/wiki/Silicon(IV)_oxide>,…..
I hope that we can utilize this and then make progress about why the TLUD-FA stoves with rice hull fuel give such a nice, clean blue flame.
Some chemists might shed more light on this, please.
Is the flame blue if the rice hulls are pyrolyzed?
Paul
Doc / Dr TLUD / Paul S. Anderson, PhD
Exec. Dir. of Juntos Energy Solutions NFP
Email: psanders@ilstu.edu<mailto:psanders@ilstu.edu> Skype: paultlud
Phone: Office: 309-452-7072 Mobile: 309-531-4434
Website: www.drtlud.com<www.drtlud.com>
From: Stoves <stoves-bounces@lists.bioenergylists.org> On Behalf Of Tony Vovers
Sent: Friday, January 11, 2019 9:41 AM
To: Discussion of biomass cooking stoves <stoves@lists.bioenergylists.org>
Subject: Re: [Stoves] Moderated Message
Aaron
It’s not my area of specialty but I suspect rice husks pyrolysis has a lot different chemistry going on than other woody biomass.
The rice husks ash is 90+% silicon dioxide Si02 compared to mainly calcium, potassium, magnesium in wood ash.
SiO2 is one of the key components of thermite that can melt steel and burns with a bright blue flame.
Thanks for posting, it’s an interesting observation and a reminder that we should not just focus on the organics in our biomass fuels.
On Fri, Jan 11, 2019, 02:04 Aaron Wingle <wingleaaron@gmail.com<mailto:wingleaaron@gmail.com> wrote:
I couldn’t figure out how to reply directly to the threads about Paul Oliver Rice Husk Burner.
Through my observations I have noticed there is something magical about rice husk pyrolysis and forced air draft stoves. They always burn clean and blue or violet in crazy ways that I haven’t witnessed on many wood stoves. Alex English has a blue flame wood stove and one other possible person and myself.
I would like to see a video or photographs showing that stove burning on wood pellets or chips. My guess is a mostly yellow flame is produced.
Does anyone know why rice husks are magical?
As an experimenter of these TLUD stoves I find misrepresentation of the cleanliness and efficiency to cause disheartened stove designers.
If I am wrong and that stove burns blue while burning wood chips or pellets, I’ll add Paul Oliver to my TLUD designer shrine of Worship.
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