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

[Thomas Reed]

Dear Tom Miles and All:

The TLUD pyrolytic gasifiers typically operate in the range 650-750C.  
It is interesting to insert a thermocouple halfway through the biomass 
charge, start the stove/gasifier and watch the reaction zone pass over 
the TC.  This is how I measured the above temperatures.  The 
temperatures are right for keeping all the minerals in the charcoal for 
soil amendment.

TOM REED



Tom Miles wrote:
> 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.
>>     
>
>
>