Dear Mark and all Gasoline is approximately CH2 (long chains of -CH2- capped with two Hs). Combustion is then
CH2 + 1.5 O2==> CO2 + H2O So the CO2 and H2O are equal on a volume basis. Weight basis the ratio is 44/18. Certainly if you cool the exhaust below about 70 C you should get condensation. Tom Reed. BEF Sent from Tom Reed's Ipad On Oct 19, 2010, at 4:14 AM, "Mark Ludlow" <[email protected]> wrote: > Hi Ken, > > I’m guessing that the I.C. exhaust must have a substantial H2O component, in > addition to CO and CO2. While it may be relatively small at I.C. exhaust > temperatures, once it has transferred its sensible heat to the feed stock, I > imagine that the exhaust gas must be close to saturation. > > Mark > > > > From: [email protected] > [mailto:[email protected]] On Behalf Of Ken Boak > Sent: Monday, October 18, 2010 11:55 PM > To: Discussion of biomass pyrolysis and gasification > Subject: Re: [Gasification] the most important thing (quite possibly) > i've > learned to date > > > > Andy, > > I'd also like to start a discussion about direct contact of the wood chips > with the exhaust gas. A pre-processing reactor that cooks the chips a little > batch at a time then dumps them into the main gasifier reactor, via auger > feed. As you say a "just in time" pipeline flow of pre-cooked, pre- heated > reactants. Water can be added if necessary as steam. > > Clearly the wood will become torrified, and the exhaust gas stream will drive > off and purge the wood fuel of moisture and volatiles, whilst raising the > temperature of the fuel considerably. There will also be an increase in fuel > energy density. > > If diesel exhaust was used (I'm thinking of a dual fuel Lister being started > up on diesel to raise process heat and provide mechanical and electrical > power for starting up gasifier), this will contain between 8% and 17% unused > oxygen, and around 80% nitrogen. Would the O2 be of sufficient quantity to > cause partial oxidation of the fuel and possibly more heat? > > If the exhaust is from a woodgas engine - it will again be around 80% > nitrogen, plus CO2 and CO. If this relatively inert hot gas is used to > purge the woodfuel of all moisture and volatiles - is the resultant off-gas > ever going to have sufficient combustible constituents that it could be > ignited in any sort of air fed burner - or is the nitrogen loading just too > high? > > > Thoughts appreciated, > > > > Ken > > > > > > > On 19 October 2010 02:13, andy schofield <[email protected]> wrote: > Jim, > > Pushing calories around in the DTU graphic model, I find moving heat into > the fuel is indeed the best use, for loose BTUs. > In practice, heat transfer into wood is not easy because of limited > conduction and radiation, and zero convection in a mound of fuel. > The GEK method is like stir-frying vegetables in a wok; forcing convection. > As each particle, contacts the walls of the pyrocoil; they cook. > > Someday I want to attempt direct contact of the wood with engine exhaust gas, > after solving a certain sealing problem. > A "just in time" inventory of heated wood; roasted to perfection. > It is a shovel ready project. > > Looking forward to your findings. > > Andy > > > > > > > > > _______________________________________________ > 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/
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