On Sunday 25 July 2010 14:25:29 Crispin Pemberton-Pigott wrote: > Dear Andrew > > >This problem became > >far more frequent when UK adopted low sulphur > >kerosene but I cannot think why. > > I think your low sulphur kerosene is made by blending regular kerosene > with South African zero sulphur SASOL artificial fuel. They treat C9H20 > to C20H42 as kerosene with a tendency to sell locally a heavier blend > than is sold internationally. > > The likelihood is that your low sulphur version has a lower evaporation > temperature so it is being over-heated now, creating the free carbon > problem.
Interesting theories Crispin. If, as you say kerosene was a simple fraction in the past and is now a mix of oils with widely differing carbon backbone then I can see how it will become more difficult to control vapourising. I think the point you make is that oil must be vapourised at a given temperature, which is normally controlled by parameters of the stove design. If you have a light fraction that boils off and then the temperature rises before the heavier fraction boils then I suppose the lighter fractions underneath can start pyrolysing, and hence char. AJH _______________________________________________ Stoves mailing list [email protected] http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org http://stoves.bioenergylists.org http://info.bioenergylists.org
