[Stoves] Fly ash and bottom ash composition in biomass fuelled stoves

Wed Aug 2 11:11:10 CDT 2017

Tom, Philip, Crispin, and all,

Yes, interesting.

My question is about pyrolytic-only gasifiers that leave large amounts 
of char behind, especially as in the TLUD situation.  I have thought 
(assumed, maybe incorrectly) that the ash is constrained ("held" or 
never formed) in the charcoal (except for the edges of the charcoal that 
might have some char-gasification occuring.  If I am correct, this would 
be a contributing factor for TLUD stoves to have low particulate emissions.

Please clarify:  is the ash being discussed in the size of <PM2.5?   Or 
is it larger stuff?

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 8/2/2017 10:23 AM, Tom Miles wrote:
>
> Thanks Philip. Interesting source.  That’s the world I work in.
>
> Tom
>
> *From:*Stoves [mailto:stoves-bounces at lists.bioenergylists.org] *On 
> Behalf Of *IPC
> *Sent:* Tuesday, August 01, 2017 3:10 AM
> *To:* 'Discussion of biomass cooking stoves' 
> <stoves at lists.bioenergylists.org>
> *Cc:* 'Crispin Pemberton-Pigott' <crispinpigott at outlook.com>
> *Subject:* [Stoves] Fly ash and bottom ash composition in biomass 
> fuelled stoves
>
> Interesting general conclusions from industrial practice at 
> http://www.biofact.eu/biomass-inorganic-split/
>
> 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 *Nikhil Desai
> *Sent:* Thursday, July 27, 2017 6:07 PM
> *To:* Discussion of biomass cooking stoves
> *Cc:* Crispin Pemberton-Pigott
> *Subject:* Re: [Stoves] New video from Tajikistan and Kyrgyzstan stove 
> pilots
>
> Crispin, Paul:
>
> A dumb question: Is it the production of gases or the high 
> temperatures -- or some sequence thereof -- which makes for very low 
> emission rates independent of fuel type and quality? Or is it the 
> relatively steady power requirements of a heating stove?
>
> It suddenly dawned on me - reading a children's book - that the type 
> of large heating stove used in Europe that also doubled for cooking 
> was because of the type of cooking: grilling, roasting, soups and 
> stews, but less of frying and spicing as in Asia.
>
> Or that the cuisine responded to the availability of energy delivery 
> system.
>
> Bernard Lewis wrote a brilliant essay called "In the Finger Zone", 
> where he said (writing from memory), "The world can be divided in 
> three areas by way of eating: fork zone, finger zone, chopstick zone. 
> These areas are also roughly fresh cream zone, sour cream (or yoghurt) 
> zone, and no cream zone."
>
> Now I am thinking of world geographies and human cooking histories as 
> "Cookstove zone, Heating and cooking stoves zone, and Combo stove zone."
>
> I still hold that for cooking-only stoves with a rich enough menu, 
> biomass of low energy density has different emission rates according 
> to fuel quality (and operating practices, of course). That a WBT can 
> deliver "stove performance" independent of fuel quality is 
> presumptively dubious.
>
> Nikhil
>
>
> ------------------------------------------------------------------------
> Nikhil Desai
>
> (US +1) 202 568 5831
> /Skype: nikhildesai888/
>
> On Thu, Jul 27, 2017 at 12:12 PM, Crispin Pemberton-Pigott 
> <crispinpigott at outlook.com <mailto:crispinpigott at outlook.com>> wrote:
>
> Thanks Michael!
>
> At the moment the engineer, Ulan, and team are preparing a producer’s 
> manual and an installation manual. The latter is very interesting 
> because they have worked out how to install these stoves (4 models) 
> into a wide range of home types, in some cases where the existing 
> product being removed is /completely/ different in the way it fits 
> into the building. Often the traditional stove is a structural element 
> in a wall!
>
> The fuels vary widely. In one region it is almost exclusively walnut! 
> OMG. A lot of fruit wood is burned, a lot of dung for cooking and coal 
> for heating (same stove). Cotton stalks are popular in that whole 
> region. It is difficult to burn slowly.
>
> There is a lot of new work going on. CARITAS Switzerland is working in 
> Tajikistan (Jonas Haller) and he is just starting to produce 700 
> stoves for this season, two models 350 of each. We were collaborating 
> on Skype to get the parts nested better and it is amazing how much 
> better two heads work than one. Jonas is producing them in Muminabad 
> in the deep south, one of the poorest regions of the poorest country 
> in the former Soviet Union.
>
> Regards
>
> Crispin
>
> Crispin keep on trucking--
>
> On Thu, Jul 27, 2017 at 10:37 PM, Crispin Pemberton-Pigott 
> <crispinpigott at outlook.com <mailto:crispinpigott at outlook.com>> wrote:
>
>     Dear Friends
>
>     The WB has put out a new combined video showing scenes from the
>     two countries and it is available
>     here<http://www.worldbank.org/en/news/video/2017/06/20/clean-individual-heating-solutions-in-the-kyrgyz-republic-and-tajikistan>.
>
>     The is a very brief shot of the gas flame at about 1:25. That is
>     the Model 4 crossdraft coal gasifier flame. Note the colour. When
>     the cover is on, it burns with less disturbance but that is hard
>     to show without a glass cover.
>
>     There is also a good view towards the end of a TLUD gasifier which
>     has a burn time of about 9 hours. The only fuel provided to
>     schools is a very poor quality 'Aine coal' which is about 50%
>     rock. It looks like black rock to start and white rock after
>     burning. That TLUD is able to burn it properly provided there is
>     sufficient draft, which means a 5m chimney. Achieving that was
>     quite difficult, I admit and was only solve on literally the last
>     day of the trip in November.
>
>     There are two videos now but I think the other one has been
>     referenced here before. The new one is combined. A total of 91
>     homes were involved in the pilot in the two countries. The PM
>     reduction numbers mentioned are modest, the true figures for the
>     Models 4 and 5 coal stove are closer to 99.9%.
>
>     Regards
>     Crispin
>
>
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