[Stoves] Forced draft with auger pellet heating stove

[Paul Anderson]

Dear Dean and Paul O.,

The type of device that you describe (your messages are below) has been 
done but at this point it is not commercially viable at small sizes for 
residential purposes.

Note:  What are commonly called "Pellet Stoves" in America meet your 
criteria of having "forced draft with auger pellet heating stove" and 
are affordable by affluent people.   However, they have full-combustion 
in one spot (burn all the way to ash without the 
gasifier-charactertistic of making gases separately from the burning of 
the gases.)  And they are not really configured to be cooking stoves.   
The American pioneer of pellet stoves (Jerry Whitfield  see:
   http://woodpelletguru.blogspot.com/2007/12/in-beginning.html  ) has 
stated in the past year at some conference his interest in making a unit 
with the cooking function.   But i have not heard more about that, and I 
do not have direct contact with him. Info about pellet stoves is at: 
http://en.wikipedia.org/wiki/Pellet_stove
Jerry Whitfield is also interested in biochar:   See 
http://harvestcleanenergy.org/blog/Jerry-Whitfield-on-biochar.html

On the topic of an actual gasifier for this task, the AVUD technology 
and initial products have been done by Chip Energy. See    
www.chipenergy.com  (Biomass Furnace and the Biomass Grill) and is 
described in the widely available paper "Micro-gasification: What it is 
and why it works" published in Boiling Point several years ago.   (also 
found at the www.drtlud.com   website ).

The problem is the costs of having augers and fans only become 
financially viable when the unit size is substantially larger than what 
is practical for residential use.    I believe that this can be 
overcome, but I and Chip Energy do not have the financial muscle to 
undertake that venture at present.

If anyone would like to explore that type of device, please contact me. 
    And you can meet with me, but this will NOT be a focal topic/target 
of my activities at the Stove Camps where I will be presenting in 
Uganda, Oregon, Tennessee and Massachusetts in July, July, Aug, and 
Oct., respectively.

I do not recommend that you start from scratch.   It took me 8 years to 
get to the AVUD stage, and I and Chip Energy have not revealed 
everything in the publications.

Paul


Paul S. Anderson, PhD  aka "Dr TLUD"
Email:  psanders at ilstu.edu   Skype: paultlud  Phone: +1-309-452-7072
Website:  www.drtlud.com

On 5/11/2013 9:51 PM, Dean Still wrote:
> Hi Paul,
>
> Although we have tried repeatedly to make a true gasifier (making gas 
> in one place that is transported to and burned in a wood gas cooking 
> stove) we haven't had great success. It seems easier to me to follow 
> the forced draft with auger pellet heating stove approach. This is a 
> well known technology and might be relatively easy to change into a 
> cooking stove for folks in industrialized countries, I think. The TLUD 
> comes close but doesn't have the ease of operation of a forced draft 
> auger type pellet stove.
>
> I'll try to make a prototype model for Stove Camp. I agree that it's 
> much better to only burn renewable gas that does not add CO2 to the 
> atmosphere. Let's get to work and create the needed solutions.
>
> Best,
>
> Dean
>
> On Sat, May 11, 2013 at 7:19 PM, Paul Olivier <paul.olivier at esrla.com 
> <mailto:paul.olivier at esrla.com>> wrote:
>
>     Anil,
>
>     I really think that we are coming close to the day when biomass
>     stoves could be installed in modern kitchens. If biomass fuel has
>     a relatively high bulk density, if it is uniform in grain size, if
>     it is below 12% in moisture, (in other word, if it's well
>     prepared), it could be gasified or pryrolized in such a manner
>     that it could produce a gas that could compete with the gas
>     derived from fossil fuels that are now being burned in modern
>     kitchens. It's not enough that we design biomass stoves for poor
>     people. We should be using them ourselves.
>
>     I say to the entire stove community. Wake up. Design biomass
>     stoves that you would be proud to use in your own kitchens. Do not
>     just worry about the respiratory health of poor people. Think
>     equally about the much bigger picture of the health of our entire
>     planet that profoundly impacts rich and poor alike. Every time we
>     turn on a modern gas appliance, we are contributing to global
>     warming. Let us do all within our power to put an end to this
>     nonsense.
>
>     Paul Olivier
>

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