[Stoves] big TLUD

[Energies Naturals C.B.]

AJH,Alex,Crispin,Dean and all the others,

thanks an awful lot for these good examples and practical advice on big TLUDs.
I always thought that the granulometry matters a lot as for the max size of a 
gasifier, but from Bill's 350 gal  experience I see it doesn't !
His shells are much the size of our almond shells and even with more dust particles among them.

Now I am looking for a long gas tank and build one myself. I was always trying to have something "inexpensive"
which allows me to use the energy delivered during the pyrolisis for heating and other purposes and not waste it.

And I'll try to run it on big chunks of 120 mm length from our old Jensen chopper which has by far the best 
ratio diesel/chopped brushwood I know of.
I can also try the G 50 chipps made with a Laimet screw chipper and other G 30 from a modern Jensen disc chipper.
If the old Jensen's chipps would work, that would be marvellous!

I'll let you know.

Rolf


 



On Thu, 14 May 2015 22:35:04 +0100
ajheggie at gmail.com wrote:

> [Default] On Thu, 14 May 2015 15:44:58 -0400,Crispin Pemberton-Pigott
> <crispinpigott at outlook.com> wrote:
> 
> >A related question for Tom Miles: 
> >What do you think of the possibility of running a steam stream into a TLUD
> >with the primary air to pass water vapour into the pyrolysis zone to create,
> >at a lower temperature, H2 and CO. This will have the effect of decreasing
> >the heat available in the fuel bed and increase the CV of the gas produced.
> 
> If I may butt in; this water gas reaction depends on the steam meeting
> with hot char at above 800C to convert most of the water, it is highly
> endothermic, so I doubt the descending pyrolysis front is hot enough
> and even if it were the endothermy and small mass of hot char would
> very quickly quench the reaction.
> 
> >This effect was accomplished by spraying water onto the hot coals in a coal
> >gas plant. It reduced the temperature of the working environment and
> >increased the CV of the "town gas".
> 
> Yes but the mass of hot coke (and probably the brick lining plus the
> fact the steam was superheated made the reaction possible for a while,
> then the coals cooled and the  steam was shut off whilst the coals
> were blasted with air to give a CO and N2 mix, this being endothermic
> took the mass back up to above 1100C., The CO+N" at 1100C was then
> burned separately to raise steam and repeat the process. This way the
> output was H2 and CO nearly free of N2.
> 
> AJH
> 
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