[Stoves] Jatropha fruit as fuel?

[Legacyfound]

Hi Crispin, 
I haven't made any briquettes from jarropa seed cake but have done so with sunflower cake "foots" of screw presses. You could create a cylindrical shape out of screw ram oil presses , as most use a tapered choke screw at end to adjust back pressure eh ?
The trick is to find a fibrous binder that would withstand the shearing and heat involved. In the oil expelling process. If I recall from Carls early designs he was generating upwards of 7000psi the British mini 40 and on up working with treated hardened augurs work in similar ranges. Thats about 50 -60 times more than needed in the wet process. The trick in using such an extruded expellate would be the addition of a binder to the feed stock which would not be destroyed in the compression process and not contaminate the oil product. If fibrous material could be added and if it could survive the compression and inherent shearing stresses it would do the trick as part of a one step process. Otherwise I feel you have a two stage process here: making oil and then making briquettes from the cake.
Richard, 
 Suffering under a palm tree in Monter Rico (It's Sunday after all)

Sent from my iPhone

On Jan 20, 2013, at 10:38, "Crispin Pemberton-Pigott" <crispinpigott at gmail.com> wrote:

> Dear Richard
> 
> I am backing your position that if you have pelleted fuel don't go pelletizing it. I also support the oil extraction idea because generally speaking oil has a higher value than the raw material (plus all those uses or markets). 
> 
> Having made sunflower presses for years the cake can be shaped in that process to facilitate burning it without an extra process - i.e. produce the cake directly in pellet/briquette format from the oil press. 
> 
> It looks obvious that pressing the oil in a batch process could produce oil and kick out a briquette, esp a holey one, in the same machine. If necessary it could have a shape that tuned the surface to volume ratio to get a particular burn rate. Once you have a known burn rate the air flows are straightforward. Preheating, ditto. 
> 
> I have been surprised by the several references that jatropha cake can be made 'easily' into briquettes and find that very encouraging. Is it all that sticky? Sunflower cake + oil dregs will stick together but it takes a long time for the oil to harder (into a black resin-like material). 
> 
> Regards
> Crispin following with interest
> -----Original Message-----
> From: Legacyfound <rstanley at legacyfound.org>
> Sender: "Stoves" <stoves-bounces at lists.bioenergylists.org>
> Date: Sun, 20 Jan 2013 10:19:30 
> To: Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> Reply-To: Discussion of biomass cooking stoves
>    <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] Jatropha fruit as fuel?
> 
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