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

IPC ipc at mweb.co.za
Thu Aug 3 06:38:44 CDT 2017


Even in a TLUD there comes a time in the Burn Sequence when some of the char is combusted, forming ash on its surface, which can be dislodged and some may be entrained as fly ash. A user who is trying to both cook and produce a char for resale needs to minimize the late combustion of char in this way.

 

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 Anderson
Sent: Wednesday, August 2, 2017 6:11 PM
To: Discussion of biomass cooking stoves
Cc: 'Crispin Pemberton-Pigott'
Subject: Re: [Stoves] Fly ash and bottom ash composition in biomass fuelled stoves

 

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'  <mailto:stoves at lists.bioenergylists.org> <stoves at lists.bioenergylists.org>
Cc: 'Crispin Pemberton-Pigott'  <mailto:crispinpigott at outlook.com> <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> 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> 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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