[Stoves] Dung Rocket Stove - Failed Test

Crispin Pemberton-Pigott crispinpigott at outlook.com
Fri Jan 6 13:55:13 CST 2023 

The vast majority burn it in sheet metal boxes with chimneys!  There is a local preference for a cylindrical combustion chamber with a rectangular heat exchanger to one side, with the chimney at the far end of the box.

At the bottom of the cylinder is a shallower box that extends under the chimney - it is like no other stove I have seen. They can cook directly over the fire, and warm water on top of the box. The efficiency is not high because there is far too much air passing through.  They are very smoky because of too much primary air creating volatiles and not enough secondary to burn it properly. The result is high CO, big smoke and low efficiency.

The new design belongs to a Chinese company normally making high end pellet stoves. It is available for licensing outside China.

Regards
Crispin

From: kevin at sun24.org
Sent: January 6, 2023 11:35 AM
To: stoves at lists.bioenergylists.org
Reply-to: stoves at lists.bioenergylists.org
Subject: [Stoves] ***SPAM*** Re: ***SPAM*** Dung Rocket Stove - Failed Test

Great information, Crispin.  How do most poor families in Tibet burn dung?

On Fri, Jan 6, 2023 at 12:44 PM Kevin McLean <kevin at sun24.org<mailto:kevin at sun24.org>> wrote:
Tom,

I'll check with SNV.  Was this testing done in India?

It's extremely interesting that 90% of the nutrients in dung are water soluble.  From what you and Richard say, it seems very possible that we can:
1.  Remove most of the nutrients from dung by soaking.
2.  After soaking, pour the solution through biochar to both filter the water and charge the biochar.
3.  Reuse the water after filtering.
4.  Make dung patties that burn hotter and cleaner.

I just asked a colleague in Malawi to test this.  He has irrigation so he can immediately start testing biochar that will be charged this way.

On Fri, Jan 6, 2023 at 11:00 AM <tmiles at trmiles.com<mailto:tmiles at trmiles.com>> wrote:
SNV put a lot of effort into the development of dung stoves for high altitudes several years ago.

Leaching nutrients and minerals from dung prior to drying and burning makes a lot of sense. The principle has been used at the farm and industrial scale. Key nutrients are about 90% water soluble. The challenge is often finding enough water.

Tom

From: Stoves <stoves-bounces at lists.bioenergylists.org<mailto:stoves-bounces at lists.bioenergylists.org>> On Behalf Of K McLean
Sent: Friday, January 6, 2023 6:05 AM
To: Discussion of biomass cooking stoves <stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>>
Subject: Re: [Stoves] ***SPAM*** Dung Rocket Stove - Failed Test

Richard,

Can you please explain further?  I don't understand.  Do you have photos or videos?

On Fri, Jan 6, 2023, 9:00 AM Richard Stanley <rstanley at mind.net<mailto:rstanley at mind.net>> wrote:
Not true paul or only partially true! In rural kenya our partners francis and mary kavita showed hor one sieves out the aromatics and dissolved solids by sloshing the patties of dung in water— then has a good liquid feetiliser as well as a spongy lignin which makes a great fuel whether briquetted or not.  Same
 I discovered that the same process applies to peat in Ireland.
Its good by stink and smoke; hello to clean burn and liquid fertiliser.
Richard Stanley
www.legacyfound.org<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.legacyfound.org%2F&data=05%7C01%7C%7C5b8196cae30f4d85532a08daf014d2b4%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638086269495507382%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=gF2hfczXREjFY5N5hRu7PeEo8bW3MF3o13lyf1hF8EM%3D&reserved=0>

Sent from my iPhone

On Jan 6, 2023, at 4:28 AM, peetersfrans at telenet.be<mailto:peetersfrans at telenet.be> wrote:

Dear KEVIN

I think we discsed 30 y ago about frensh frees …..but Canada was to cold for patatos down 1,5 $ !
I remember you wash  salt out of dunge  and looked for analytics for the ash danger .
As for dung cooking/baking ,it is done in Anatolia TURKEY.   No trees ,to see. villages of mud and corn looks haver, no mais .
The fireplace is chimney  fumehood  integrated about 3 meter high and always a pasat wind avaiable .
To replace it you need a suction stove , fan , jet  or and partial wood/dung using in the 3th world only…

Regards
F.



Van: Stoves <stoves-bounces at lists.bioenergylists.org<mailto:stoves-bounces at lists.bioenergylists.org>> Namens Ronal Larson
Verzonden: vrijdag 6 januari 2023 5:54
Aan: Kevin McLean <kevin at sun24.org<mailto:kevin at sun24.org>>; Paul Olivier <paul.olivier at esrla.com<mailto:paul.olivier at esrla.com>>; stoves at lists.bioenergylists.org<mailto:stoves at lists.bioenergylists.org>
Onderwerp: Re: [Stoves] ***SPAM*** Dung Rocket Stove - Failed Test

Kevin,  Paul and stoves list

                1.  What is the reason for this test of a rocket - instead of a TLUD or other char-making design?

                2.  I agree with Paul, but I can conceive of cost, time spent,  and CDR advantages of charring dung, at lest with certain family situations.   But I can’t see those advantages with combusting dung.

Ron

On Jan 5, 2023, at 9:57 AM, Paul Olivier <paul.olivier at esrla.com<mailto:paul.olivier at esrla.com>> wrote:

Dung is not a good fuel.
It is much better to ferment it and use it as a feed.

On Thu, Jan 5, 2023 at 10:12 PM Kevin McLean <kevin at sun24.org<mailto:kevin at sun24.org>> wrote:
List,

Today we tested a dung rocket stove.  I'm a little surprised that the test was a failure.  Can anyone suggest changes?  And can anyone in India help us with our testing of dung as fuel?

This is very similar to a sawdust cookstove.  We made cylinders of dung with vertical holes in the center and let them dry for a month.  We did not mix anything into the dung.  We used 5 liter paint cans to form the cylinders.

<Dung rocket stove - wet.jpeg>
<Dung cylinder - Failed test.jpeg>

We tested with and without a metal can over the dung cylinder.  We raised the cylinder and lit a wood fire under it.  The fire was never strong and there was a lot of smoke.  Here is a video<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1xCrABfFFOVlvtGn925VW8FT9lXl660Zk%2Fview%3Fusp%3Dshare_link&data=05%7C01%7C%7C5b8196cae30f4d85532a08daf014d2b4%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638086269495507382%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=5H%2FTCy85u0OAfNgpoQH0%2BG35Q%2FvS%2FX9KiTBgGOxRH%2BM%3D&reserved=0> of the test with a metal can over the dung cylinder.

We seem to be having early success with upright dung sticks in a metal band and top lighting piles of dung patties.  But these need to be tested by people more familiar with using dung as fuel.

<Dung sticks in a metal band.jpeg>
<TDB of pile of dung patties.jpeg>

We could use some help from someone in an area where dung is used for cooking.  None of my colleagues live in such an area.

Thanks,
Kevin

Kevin McLean, President
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