[Stoves] Top lit updraft combustors

Crispin Pemberton-Pigott crispinpigott at outlook.com
Wed Dec 13 19:37:21 MST 2017

Thank you Norbert for demonstration my point well.

A top-lit updraft masonry heater can be abbreviated to a TLUD masonry heater.

When I was a Boy Scout we always built a large TLUD campfire at the main event with Scouts sitting around it on all sides. It was done to reduce smoke to a minimum so it didn’t bother anyone no matter what the wind direction.

I am aware that the Masonry Heater’s Association has comparison test results showing the benefits of TLUD v.s. BLDD combustion in the same device.


From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Ronal W. Larson
Sent: 14-Dec-17 06:58
To: Discussion of biomass <stoves at lists.bioenergylists.org>; Norbert Senf <norbert.senf at gmail.com>
Subject: Re: [Stoves] Top lit updraft combustors

Norbert and list:

                See insert questions below

On Dec 13, 2017, at 3:41 PM, Norbert Senf <norbert.senf at gmail.com<mailto:norbert.senf at gmail.com>> wrote:

Crispin Pemberton-Pigott wrote:
>>It is inappropriate for promoters of TLUD pyrolysers to claim that the term does
>>not/cannot be applied to other devices that are top lit updraft combusts.
               [RWL:  I’m going to stay away from the TLUD name issue here.  The key difference is between pyrolyzer and combustor, so the context should always be clear on this list.   Nobody on this list need be talking about the Adam’s Retort or charcoal combustors as TLUDs.

As an outsider to the TLUD scene, I'd note that we make a top lighting updraft combustor,
in the form of a heating appliance indigenous to northern Europe. The top lighting is
not mandatory or traditional, but has been found through testing to be a preferred mode
of operation for combusting a batch load of cordwood in the 10 - 40 kg range with very low
particulate (PM) emissions.
               [RWL:  Can you give a lead to look this up?   Makes char?  Probably not as you say “combustor”.  Any theory on why top lighting is cleaner?  Do you always operate batch load only?

A newly developed combustion air system from Austria can be configured to
produce biochar as a byproduct. I fooled around with this last winter, and was able to
make around 300 kg, as a byproduct of heating our house. We have conducted EPA-style
dilution tunnel PM testing on this as well as on pellet (heating) stoves, and are burning cordwood with
about half the PM emissions of pellet stoves.
               [RWL:  Can you give us a lead on the Austrian group?
                              Can you say a bit more about your own 300 kg of char-making?  I pull char (with tongs) regularly (when I think of it) out of my very small wood stove.  What sort of char-making efficiency in your method?  (I have no idea on mine, but it is not hard to do - and is my concept on how char was produced for the Terra Preta soils.)

You can find some details here:
               [RWL:  I thought you did a nice job in explaining your whole lab process.  I tried to learn more about Condar - but no web site was found.  Is this a method or a product?

               I stumbled on the stove decathlon.  Any comments for us on whether that could help our interests with much smaller stoves?



Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
Stoves mailing list

to Send a Message to the list, use the email address
stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>

to UNSUBSCRIBE or Change your List Settings use the web page

for more Biomass Cooking Stoves,  News and Information see our web site:

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20171214/3d1cb588/attachment.html>

More information about the Stoves mailing list