[Stoves] Jatropha seedcake as fertilizer to continue offlist
CHRISTA ROTH
stoves at foodandfuel.info
Mon Jan 24 00:37:45 CST 2011
Jonathan and others, I suggest to continue this offlist and will try
to get the connections established.Christa
Am 23.01.2011 um 10:23 schrieb Jonathan Otto:
> Christa,
>
> Data on use of J seedcake as fertilizer woild be most welcome.
> Please do send the link,
>
> Jonathan
>
> From: stoves at foodandfuel.info
> To: pietverhaart at bigpond.com; stoves at lists.bioenergylists.org
> Date: Sun, 23 Jan 2011 09:52:12 +0000
> Subject: Re: [Stoves] (no subject)
>
> To Piet: the composition is not the problem, its the 'bulk
> properties' related to unshaped seedcake: with the oil the small
> particles stick and lump together so its too dense to get the air
> through that is needed for combustion (imagine it like fine sawdust
> soaked in oil...). if you change the aggregated particle size to
> make slightly bigger 'lumps' and shape them e.g. by pelletising or
> briquetting, or you combine it with some more chunky material that
> still keeps some air-paths open, then it burns really well in a
> gasifier. you just need to take care of the 'two types of fuels'
> contained: the solid biomass and the evaporating oils (I am sure an
> expert can put that in better words), that you need to treat
> differently to get a clean combustion.
>
> To Boston: on other, non-energy uses: I had a discussion with people
> from a substantial J-project in Malawi: They conisder J-seedcake
> as a wonderful soil-additive like it is. they told me it works even
> without composting it first. they seem to have data on yield
> increases on maize. If that is of interest, I can link you to them.
>
> regards from Lilongwe, Christa
>
> Am 23.01.2011 um 07:00 schrieb Peter verhaart:
>
> What is the composition of Jatropha seedcake? Probably traces of
> oil, how about water? A high ash content?
> If no water and low ash, it might be the shape of the seedcake, too
> big, relatively little surface area per volume.
>
>
> Just a thought.
>
> Peter Verhaart
>
> On 21/01/2011 06:39, Boston Nyer wrote:
> Hi Richard,
>
> I have a related question to this discussion, which I think is
> interesting.
>
> At CU, we have a Jatropha project that you fielded some questions
> about a few months ago. As I'm sure you've heard, Jatropha seedcake
> does not burn well, not even close. So, one of our questions now
> is: what can we do with this waste stream this is both useful and
> desirable?
>
> One approach we will test is to carbonize the material and for
> biochar briquettes (and a water filter media, etc.). However, I
> wholeheartedly agree with your sentiment on biochar briquettes.
> What is your opinion if the ag-waste doesn't burn well normally? It
> still seems a bit contrived, eh?
>
> I'm looking forward to hearing your perspective.
>
> Cheers,
> Boston
>
>
>
>
> On Thu, Jan 13, 2011 at 2:13 PM, Richard Stanley <rstanley at legacyfound.org
> > wrote:
> Jessica,
> Me again, I answered some of these questions to you in a post
> directly to you (as that one came directly from you) --a few
> minutes ago, but
> let me add a few comments in reponse to your other questions here...
> ( am responding in-kind below...)
>
> On Jan 13, 2011, at 12:33 PM, Jessica De Clerck wrote:
>
> Hello,
>
> I am looking for some insight into an array of issues around fuel
> briquettes and stoves. I apologize for the long list! I am hoping
> Crispin, Dr. TLUD, Richard and others can answer some of these.
>
> Burning Stalks
> At Stove Camp 2010, we used TLUDs to burn what I recall were maize
> stalks in Dr. Anderson’s TLUD. It worked great. However, if maize
> or sugar cane stalks can be burned for fuel, why are people not
> already using this fuel in three stone fires, or are they? I did
> not see this in Uganda, but I do not know about Haiti or elsewhere
> (where I will be working soon). I understand that a TLUD or other
> stoves would do a better job of cleaning up emissions. -But if a
> person had access to free fuel in their fields, I would think they
> must have a good reason for not burning it, even in an open fire.
>
> Does the fact that it burns quicker than wood deter people because
> it requires more effort to feed it constantly into the stove? Or
> does it not burn as cleanly as wood?
>
> Consumption Rate
> Does burning fuel in a TLUD or other stove slow down the rate at
> which fuel burns as compared with fuel burned in an open fire? It
> seems to me it would because the airflow into the fire would be more
> controlled in a stove.
>
> Density
> This also brings up the question of the density of a fuel
> briquette. What difference does density make? It seems like we pay
> a lot of attention to this, but to me it seems the only difference
> is that the less dense the briquette the quicker it will burn. Does
> a less dense briquette burn hotter (assuming identical material is
> used in each briquette)?
> It burns quicker but not necessarly hotter. Density is roughly
> equivalent to duration assuming same blend and stove . Greaster
> density also equates (ex any special starters) to harder start with
> above assumptions also in effect. You 'pays yer money and takes yer
> choice', eh ?
>
>
> Briquette Stoves
> I have recently built another RokStove or Holey Rocket –the side fed
> rocket stove for holey briquettes out of clay and sawdust. I made
> it to the best specifications I could come up with after considering
> rocket stove principles, which was 9” long, 15” tall, and 5” in
> diameter both in the feeding area and combustion chamber. Once the
> stove has been fired, these dimensions will have shrunk
> approximately 10%. This will leave a gap between the stove and my
> 4”x 2” holey (1” hole) briquettes. I would like to know if anyone
> else has had experience in building or using these stoves so that we
> may share lessons learned. I already speak with Rok and he’s a
> great help.
> Rok is the guy for this. He speaks of the need to think a lot about
> internal hole size to regulate primary air volume and via my own
> insight gained through such Stoves group luminaries such as Crispin
> here, temperature...The annular space between the OD of the
> briquettes and the ID of the feed tube, is also important.
>
>
> What other stoves have been tested and are recommended for burning
> holey briquettes? I am assuming unless the hole is used as an air
> channel as in the RokStove, the hole in the briquette makes no
> difference (for example if the briquettes are just put in a pile, or
> used in a gasifier, because otherwise a briquette can be broken into
> pieces if too large).
> Rite-e-o on that one, save the one fact that the hole greatly
> acceletates --and makes more consistent-- the drying rate. Add too,
> the effect of the hole in burning them up right, in the three stove
> open burn situation. ie., ex any stove surround structure.
>
> Green Charcoal vs. Uncarbonized Briquettes
> Lastly, has anyone done a study of the emissions from making “green
> charcoal”? I see what Amy Smith is doing with the kilns to make
> charcoal and the Adam Retort and there seems to be a ton of smoke
> coming off the kilns in the process of making the charcoal. I
> understand it is an improvement from traditional charcoal making,
> but I wonder if anyone has measured the emissions so that I can
> compare it to other processes.
> Shhh. you are unveiling the big secret of the carboniser school
> here !!! We don't want to talk about the smoke and energy losses due
> to carbonisation..not as they occur in the user site and all
> conditions they live with...and after the techies have left and the
> ted talks and photo op's wither from our memories.
>
> But why carbonise at all if you have access to the charcoal crumbs
> and fines and dust found around every charcoal sellers stall
> everywhere in the third world...? Thie waste accounts for between
> 15 and 20% of the lump charcoal being brought into the stall and
> sold through it...You blend that amount into the briquettes and you
> double the market for the seller or proportionately reduce their
> demand on charcoal while earning them the same income... but I'm
> being a bi facetious: It makes sence where there is no charcoal
> dust--I guess...
>
>
> Does anyone have recommendations on what raw materials ought to be
> burned in a retort vs. crushed and made into uncarbonized
> briquettes? I’m thinking coconut shells and other hard materials
> that cannot be crushed easily, but I would appreciate more input.
>
> Thank you all for you time.
>
> Jessica De Clerck
>
>
>
>
>
>
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> --
> Boston Nyer
> Graduate Student
> Department of Civil, Environmental, and Architectural Engineering
> University of Colorado at Boulder
> (585) 503-3459
>
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