On Sunday 15 January 2012 18:09:00 Alex English wrote: > Andrew, > Can we melt steel with torrified wood?
Probably and it would be easier the higher the carbon content of the steel as the carbide forms a eutectic mixture with the iron which has a lower fusion temperature than iron. Of course you can raise temperature substantially by using an oxidant other than air because that removes the nitrogen from the massflow. What calorific value for the torrefied wood? A propane:air flame has an adiabatic temperature of ~2000C but I have never managed to melt steel with it, oxy-acetylene is good for 3000C and easily melts steel. Whilst I'm fairly confident the peak temperature achievable with a given flame is proportional to the mass flow I don't think I can calculate from first principles (the sum of energies from bonds broken and bonds made) and come to the same results as experiments measure various flames to yield. Worse than that, I don't have access to equipment capable of measuring flame temperature and the temperature of the item being heated by it. > > I'm trying to follow your thinking on the propane flame, inner/outer > business. Are your suggesting that the pyrolysis gasses be kept > separated from the CO from charcoal gasification in one device like > the Dasifier and then burn the latter inside the former. Just speculating along those lines. Consider also that propane burners with electrical elements heating the combustion air reach much higher temperatures, so the woodgas flame might preheat the furnace and the air for the char gasification, so instead of the CO+N2 mix exiting the gasifier at 850C... > > The other Das trick to elevating the useful temperature is the intense > mixing he generates with his compressor induced flows, thereby > maximizing the heat flux in a small volume. Yes but isn't this more to do with losses from the furnace, definitely keeping the smallest flame ( which requires mixing and turbulence to complete the reaction in the mallest volume) keeps all the heat concentrated. We seem to have drifted somewhat from DD verses IDD for a clean flame. AJH _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] 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/
