[Stoves] Hypothesis for Wonderwerk TLUD-ND
Paul Medwell
paul.medwell at adelaide.edu.au
Sat Sep 3 05:57:35 CDT 2016
Once again, great suggestion Philip. Unfortunately, I live in a nanny state...dichloromethane or methanol are considered "too hazardous", so I reckon pyridine (no matter how effective) is probably off the cards. Anyway, we have colleagues that do this stuff all the time, so we'll sort something out.
-------- Original message --------
From: Philip Lloyd <plloyd at mweb.co.za>
Date: 03/09/2016 17:03 (GMT+09:30)
To: 'Discussion of biomass cooking stoves' <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] Hypothesis for Wonderwerk TLUD-ND
As to solvents, try pyridine. As I recall that takes up everything but the really low-hydrogen polyaromatics.
Philip
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Paul Medwell
Sent: Friday, September 2, 2016 9:22 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Hypothesis for Wonderwerk TLUD-ND
Dear Philip,
Thanks for another great suggestion.
This is also something that is planned. As part of an unrelated project we have been looking at this: we are still in the process of finding a solvent that has a collection yield, that doesn't interfere with (or gives an interference profile that we can correct for) and that OH&S will let us have. Fortunately, for the cookstove work there are fewer constraints than the other project (which is limited to sampling extremely low flowrates). We'll find a solution and share it.
Cheers,
Paul
On 2/09/2016 11:34 PM, Philip Lloyd wrote:
I think you will find dissolving them in a fairly pure solvent and doing an infra-red spectrum will tell you a lot.
Prof Philip Lloyd
Energy Institute, CPUT
SARETEC, Sachs Circle
Bellville
Tel 021 959 4323
Cell 083 441 5247
PA Nadia 021 959 4330
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Paul Medwell
Sent: Friday, September 2, 2016 4:12 AM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Hypothesis for Wonderwerk TLUD-ND
Dear Kirk, Paul and all,
Kirk: thanks for circulating your hypothesis. This seems well-founded.
Paul: measuring long-chain hydrocarbons / tars is part of the planned project of PhD student Thomas Kirch.
The intention is to measure the tars fairly soon. The catch is that our existing micro-GC isn't suitable for this, and finding someone who is willing to put our tars in their GC-MS is proving difficult. Until we get funds to buy our own, any suggestions for other ways of characterising the tars?
Cheers,
Paul
On 1/09/2016 10:53 PM, Paul Anderson wrote:
Kirk,
The Wonderwerk Man has again done wonderful work!!!! Stove Summit, Stove Camp, assisting Dennis (who then won the Cat Pee award), and cooking with Flip. It is always a pleasure being with you.
The hypothesis (explanatory document) is well done. All serious stove researchers should read it. Where is this document being placed for public access. I offer to place it at the drtlud.com website. (Send your reply to James Schoner directly or via the Stoves Listserv; I will be in Mexico for the next 13 days).
Hypotheses are statements that ask to be confirmed. The folks with the scientific equipment can now step in and see if the long-chain hydrocarbons are indeed breaking up when and where indicated by the hypothesis. Good if that could be soon, but I expect not. In the meantime, the excellent low emissions (which are facts, not hypotheses) speak for themselves.
The needed scientific studies would help answer several questions such as whether all three steps (levels) are needed to accomplish the low emissions and the ability for turn-down to low fire.
About turndown such as when cooking in Flip's oven, a different solution is to have a second gasifier reactor (fuel chamber) that has a smaller diameter.
Keep up the good work!! (werk)
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 9/1/2016 12:34 AM, kgharris wrote:
All,
Talking about stoves at the InStove Stove Summit and Aprovecho Stove Camp made me think through the workings of our Wonderwerk TLUD-ND. I needed to create a working hypothesis of why it burns as cleanly as it does. Attached is the hypothesis. It may not be completely correct, but it does provide an explaination, or at least a place to start an explaination. There is a lot that I don't know about this burning method and a lot of work left to be done.
At Stove Camp, Sam Bentson, Aprovecho's lab engineer offered to help me probe into the pressure variations in the stove. I was sadly involved with too many things to take him up on it. My loss! What I did do was to support Dennis, a visiting student from China, in his development of a wok support with skirt and chimney. He tested it on top of the latest Wonderwerk TLUD-ND stove and the results were impressive. He made several adjustments to the dimensions which seemed to improve its performance even more. He required only high power and no turn-down.
After Stove Camp I visited with Jon and Flip Anderson. We put an older Wonderwerk TLUD-ND under one of their clay ovens, and baked a cake. It required two fuel (vertically arranged split sticks of an unknown variety of hardwood) loadings of the stove, the first to heat the oven and give about 30 minutes of baking and the second finished the 1 hour baking time. This showed the need for turn-down capability for oven baking. The latest Wonderwerk stove, which I had left at Aprovecho, would very likely have done it with only one load of fuel, because of better turn-down and more efficient burning.
I hope you enjoy looking through the hypothesis.
Kirk H.
Santa Rosa, CA. USA
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