Hi Tom, I hate to post here too often as I am just a babe in gasification terms.
I passed the comment on thermite welding because I spent 3 months using the technique to weld the copper tails onto the aluminium buzzwork for the aluminium smelting cells. This was to distribute 96,000Amps at 4V at the Tiwai Point Aluminium Smelter. The thermite mix was aluminium and copper oxide. This required a staged start with two different compounds to bring the temperature of the aluminium up to a point where it destabilised and ignited. About 2 seconds at over 2000° the molten copper would melt through the copper retaining discs and drop through into the mold. I have no doubt you understand the chemistry better than I. What we were able to achieve was to take the CADWELD training from the English engineer and increase their expected output by 250% from 8 welds per two man team per day, to 20. We actually did that by lunch time, but it was getting embarrassing for them so we dithered around in the afternoons. At the same time we halved the expected failure rate:) Kind Regards Jason Stewart On Wed, Jul 13, 2011 at 11:21 PM, Thomas Reed <[email protected]>wrote: > Dear Mark and all > > Thermite welding is usually based on Mg, not Aluminum, but I presume a > properly prepared aluminum powder with minimal oxide skin could be used. > > Tom Reed > > Dr Thomas B Reed > President, The Biomass Energy Foundation > www.Woodgas.com > > On Jul 12, 2011, at 11:32 PM, Jason Stewart <[email protected]> wrote: > > Haha, you are then set up for thermite welding. > > On Wed, Jul 13, 2011 at 2:59 PM, Mark E. Ludlow < <[email protected]> > [email protected]> wrote: > >> Dr. Tom,**** >> >> Can one hammer mill->ball mill the Al into a powder and burn it directly >> (stand back!)?**** >> >> Mark**** >> >> ** ** >> >> *From:* <[email protected]> >> [email protected] >> [mailto:<[email protected]> >> [email protected]] *On Behalf Of *Thomas Reed >> *Sent:* Tuesday, July 12, 2011 5:53 PM >> >> *To:* Discussion of biomass pyrolysis and gasification; Art Krenzel >> *Cc:* <[email protected]>[email protected] >> *Subject:* Re: [Gasification] CONSERVATION OF ENERGY**** >> >> ** ** >> >> PS. **** >> >> ** ** >> >> According to my book, THE FREE ENERGY OF BINARY COMPOUNDS (available at >> <http://Woodgas.com>Woodgas.com)**** >> >> ** ** >> >> The Enthalpy of combustion of Al **** >> >> ** ** >> >> Al + 3/2 O2 ==> 1/2 Al2O3. Delta H (C) = 178 kcal/mole = 745 kJ/mole. >> The MW of Al is 27, so this is 27.6 kJ/g or 12,527 kJ/ lb. 1 kW hr is 3.8 >> MJ, so this is 3.3 kW hr/lb. **** >> >> ** ** >> >> Well worth capturing.**** >> >> ** ** >> >> Tom Reed**** >> >> >> Dr Thomas B Reed**** >> >> President, The Biomass Energy Foundation**** >> >> <http://www.Woodgas.com>www.Woodgas.com**** >> >> >> On Jul 12, 2011, at 7:51 PM, GF < <[email protected]>[email protected]> >> wrote:**** >> >> ** ** >> >> **** >> >> The other day I posted an article on this site concerning:**** >> >> Cornish Hydrogen Generator. Keelynet, which describes a method of >> converting**** >> >> Aluminum into its oxide and in the process cracks water, freeing up >> hydrogen for use as fuel for a light car.**** >> >> By all accounts, using this gas in the place of any other fuel.**** >> >> Distances and the amount of metal used in this attainment were mentioned. >> **** >> >> I was hoping for a reaction from one of the many “Energy Economists”**** >> >> Who lurk on this site, to respond with negative information regarding the >> impracticality and waste fullness of such a process?**** >> >> I believe there is a large following on this site who are interested in >> obtaining electrical power using renewable energy, derived from carbon >> neutral sources.**** >> >> They might question the economics and ethics of using a refined ore as >> fuel.**** >> >> Instead of chopping down oxygen producing vegetation. **** >> >> In this respect I am a nonconformist. I believe most Aluminum is produced >> by Hydro electric power and, so the CO2 is not in the equation.**** >> >> My second comment is harnessing a “free” supply of high temperature heat >> which is emitted from most Ice’s in the form of “Hot Exhaust”.**** >> >> This is the place to install a reactor capable of converting beer cans >> into hydrogen as not too much energy would be needed to complete the >> reaction. Bubbling super heated steam through a molten bath of AL would give >> pure hydrogen.**** >> >> No tar, and the ash is a hot commodity**** >> >> **** >> >> The real question is: how much energy is locked up in a pound of AL**** >> >> **** >> >> gfwhell**** >> >> ** ** >> >> _______________________________________________ >> Gasification mailing list >> >> to Send a Message to the list, use the email address >> <[email protected]>[email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> <http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org> >> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >> >> for more Gasifiers, News and Information see our web site: >> <http://gasifiers.bioenergylists.org/> >> http://gasifiers.bioenergylists.org/**** >> >> >> _______________________________________________ >> Gasification mailing list >> >> to Send a Message to the list, use the email address >> <[email protected]>[email protected] >> >> to UNSUBSCRIBE or Change your List Settings use the web page >> <http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org> >> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org >> >> for more Gasifiers, News and Information see our web site: >> <http://gasifiers.bioenergylists.org/> >> http://gasifiers.bioenergylists.org/ >> >> > > > -- > Kind Regards > > Jason Stewart > 3 Opahi Bay Road, > RD3 > Warkworth > 09 4220054 > > > > _______________________________________________ > Gasification 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/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ > > > _______________________________________________ > Gasification 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/gasification_lists.bioenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ > > -- Kind Regards Jason Stewart 3 Opahi Bay Road, RD3 Warkworth 09 4220054
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