[Stoves] Vegetable oils

[Peter Verhaart]

Dear Martin,

Burning vegetable oil in a spray of fine droplets makes much more sense 
than trying to boil unboilable oils.
Apparently they paid less attention to the tendency of vegetable oil to 
polymerise or to form gunk by a different process.

Beste groeten van het andere eind van de wereld.

Piet

On 29/11/2011 09:00, Boll, Martin Dr. wrote:
>
> Dear Piet and Frans,
>
> As far as I remember to have read, the Protos makes a real high pressure by
> a pump, in order to make a small droplet spray that can be ignited directly,
> and not the same way as a kerosene-burner, with pre-warming and first making
> damps out of the fuel, which secondly burns.
>
> Really _years_ ago I wanted to get some more information about the
> Protos-stove, because the company which deals/develop it is settled in
> Germany.
> They only proposed to inform about the progress of the stove.
> I got never further information.
> Is that for secret, is that because of my being un-important, is that
> because of long-term "shit"-function of that stove - like old wafer-irons
> have fat-layers, which would, by time, in the burner inside clog the hot
> feeding tubes.
> Frans, your idea with ultrasonic made droplets is fine.
> Since many years ultrasonic equipment is used to humidify the breathing air
> of Patients in the clinic.
> Now I see more and more that sort of ultrasonic-made "fog" being dispatched
> over fruit and vegetables in supermarkets, to hold it fresh (to keep the
> water-weight). I guess that cannot be any more very expansive.
>
> Regards
> -En beste groeten half de wereld rond en in de buurt-
>
> Martin
>
>
> ---------------------------------
> Dear Crispin,
>
>
>
> As far as I know the difference between kerosene (paraffin) and higher
> hydrocarbon fractions, including vegetable oils is the fact that they are
> not distillable under atmospheric pressure.
>
> Undistillable hydrocarbons are fed into the fire as a spray of very fine
> droplets that burn completely. The same could be done with vegetable oils
> at the combustor end. However, most vegetable oils tend to react slowly
> with oxygen to form gunk which eventually blocks the passages it has to
> flow through.
>
> So for a stove that burns vegetable oil, the piping from the storage to the
> burner should be of very simple shape and easy to clean.
>
> Realising that producing a spray of fine droplets is out of the question
> for domestic stoves, we have to find something that feeds the oil to the
> combustion zone where the carbon, resulting from the decomposition of the
> oil is burnt as well. Possibly something like a perforated disk where the
> oil burns in updraft mode and where the holes occupy a sufficient part of
> the disk area that all the char comes in contact with air.
>
> Does the Protos stove have any relation to Siemens. If so they should hang
> their head in shame, not having read up on the properties of vegerable oil.
>
>
>
> All the best,
>
> Piet
>
>
>
> _______________________________________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://www.bioenergylists.org/
>
>