[Gasification] the most important thing (quite possibly) > i've learned to date

[Thomas Reed]

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" <mark at ludlow.com> 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: gasification-bounces at lists.bioenergylists.org [mailto:gasification-bounces at lists.bioenergylists.org] 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 <scothebuilder at hotmail.com> 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
> 
> 
> 
>       
> 
> 
> 
> 
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