[Gasification] "Continuous analysis of elemental emissions fromabiofuel gasifier"

[Tom Miles]

Jeff, 

If you are just using the gas directly for cooking or heating the TLUD may
actually work fairly well. There is a threshold temperature below which
about 60% of the alkali stay in the char. From memory I think that is about
700 C. The char has high insulating properties so it may allow you to "boil
off" the gas and leave some alkali in the char without slagging. Try it, 

Tom
   

-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] On Behalf Of Jeff Davis
Sent: Monday, March 26, 2007 4:24 PM
To: gasification at listserv.repp.org
Subject: Re: [Gasification] "Continuous analysis of elemental emissions
fromabiofuel gasifier"

Dear Doug & Tom,

Well, maybe there is some hope for reducing slagging of ag waste by
carbonizing it.

I would have liked to use the IDD (T-LUD) gasifier but I fear that as the
FP zone (flaming pyrolysis) moves downward the charcoal would condense and
store some of problem elements fore mentioned.

Maybe the old tried and true 55 gallon drum kiln, start the fire on the
bottom...

Maybe I can use my Gas-of-Fire 1000 to make the charcoal. Just run it in a
modified mode of operation. It would be cool if one could use the same
gasifier to make the fuel that will use the fuel. Of course later (if it
worked) a larger version for charcoal making gasifier might be in order.

Thanks for the replies,

Jeff



> Jeff, Doug,
>
> We dreamed about making this split with pyrolysis and with gasification.
> In
> both cases some stays with the char but most of the water soluble
> inorganic
> elements, like sodium, potassium, chlorine and sulfur go with the vapors
> or
> gas.
>
> Tom

> Hi Jeff,
>
> You raise an interesting point:
>
>> One of my books state that when gasifiing ag waste you need to carbonize
>> it
>> first (make charcoal). I have some major doubts, I think the problem
>> will
>> stay with the charcoal.
>
> Cannot comment on Ag waste, but it seems that there is validity for some
> elements to leave  the biomass as pyrolysis gas, leaving the carbon to
> then
> combust or gasify without problems. I refer to mainly woody biomass, but
> doubt if the same could be achieved with Ag waste , which can have a high
> silica content.
>
>> The question is: is it possible to vaporize and remove these problem
>> elements
>> when making charcoal?
>
> It is all theory until you try it with your choice of waste, so have a
> try,
> it beats reading about it (:-)
>
> Doug Williams,
> Fluidyne Gasification.


-- 
Jeff Davis

Some where 20 miles south of Lake Erie, USA

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