[Stoves] Down with Fantasy-draft stoves

Paul Anderson psanders at ilstu.edu
Thu Mar 29 07:39:16 CDT 2018


Alex (and others)

You wrote:
> That primary air  can be introduced above the fuel with the secondary air
> and drop down and spread out below the
> pyrolysis front.
   I would certainly like to see this demonstrated (visible) or 
supported by scientific measurements.  Frankly, I have my doubts, 
especially if it is less than 20 cm (8 inches) in diameter..

Paul

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

On 3/29/2018 5:40 AM, Andrew Heggie wrote:
> On 29 March 2018 at 01:32, alex english <aenglish444 at gmail.com> wrote:
>> Andrew,
>> If you are curious you can 'freeze' theTLUD process at any point by setting
>> the a TLUD in a pan of water that shuts off the air and wicks water into the
>> raw pellets in the bottom of the fuel chamber. They will swell and wick all
>> the way up to the Migrating Pyrolysis Front . The Torrefied layer and the
>> char above will not swell. A careful excavation of the fuel will reveal all.
>> When I did  this with the 18 inch diameter chamber I found a horizontal
>> layer of an inch, or a bit  less, of pellets in transition from raw pellet
>> to torrified pellet to charred pellet.
> Thanks again Alex it's an interesting experiment but I'm quite happy
> to take your word for the horizontal MPF.
>
>
>
>    Misting the outside of the stove
>> will can also give clear impression of a planar descent of the  MPF.
> I never did much with pellets as I felt they were not a likely fuel
> compared with stickwood and so not representative of most users  In UK
> I find them too expensive compared with other fuels.
>> With very dry fuel like wood  pellet very little primary air is required.
>> That primary air  can be introduced above the fuel with the secondary air
>> and drop down and spread out below the
>> pyrolysis front.  If introduced tangentially the cooler fresh air
>> centrifuges to the outside edge of a round chamber and the flame tornados up
>> the middle. A layer of fresh air one millimeter thick descending around the
>> edge of a fuel chamber would be enough. Not a lot of control but this
>> resembles what many people have used this sort in other contexts. With
>> fussy fuel quality and placement it behaves in the steady top down way that
>> a TLUD does with a little extra char burning.
> Yes I made many such vortex burners in my experiments, the largest
> being 4foot diameter but I supplied all the air from above and
> inevitably to excess.
>
>
> Andrew
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://stoves.bioenergylists.org/
>





More information about the Stoves mailing list