[Stoves] Down with Fantasy-draft stoves
Paul Anderson
psanders at ilstu.edu
Mon Jun 18 00:12:39 CDT 2018
Alex,
What is shown in the photos certainly does and should work. But what
your initial message described (as I interpreted it) was something
different, but precisely how different I do not remember. The 1 mm
gap??? Or that the primary air was moving downward INSIDE the
large-diamter fuel chamber (as if there were no holes for primary air to
enter at the bottom? I do not remember, and I am not making an issue
of this.
Primary air is able to go down the outside of a fuel chamber to reach
the primary air inlet holes at the bottom of a TLUD stove.
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 6/17/2018 4:23 PM, alex english wrote:
> Hi Stovies,
>
> This relates to Paul's doubts that all the air can come in the top of
> a TLUD.
>
> I took two off the shelf items and with no alterations and made a
> serviceable stove for wood pellet fuel . I placed a stainless holey
> cutlery strainer on a shim in the bottom of a small stainless milk
> pail. The strainer is 4 5/8 inches in diameter and 5 inches tall. The
> top was about 3/4 of an inch below the top of the pail. Half filled
> with pellets, which leaves the pellets 3.5 inches the below the pot.
> Top lit, it burned for about 45 minutes with all the air coming in
> from the top. The migrating front headed 'south' predictably. A little
> ash formed around the edges. Good flame stability.
>
> It is basically a one speed device unless you manipulate the fuel
> profile.
> The pot position, size and shape is a factor as the exhaust and air
> pass by each other in close proximity going in opposite directions.
>
> A pretty simple stove.
>
> Alex
>
>
> On Thu, Mar 29, 2018 at 8:39 AM, Paul Anderson <psanders at ilstu.edu
> <mailto:psanders at ilstu.edu>> wrote:
>
> 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 <mailto:psanders at ilstu.edu>
> Skype: paultlud Phone: +1-309-452-7072
> Website: www.drtlud.com <http://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
> <mailto: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
>
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