[Gasification] Updated Update #2

[Thomas Reed]

Dear Jeff and Tom Miles:

A few pounds of charcoal briquettes would insulate the grate from direct 
combustion and probably permit you to run a long time. 

I wish there were a source of charcoal briquettes that were half the 
current size for starting stoves and small gasifiers.  The standard 5cm 
pillows are fine in a BIG gasifier.

TOM REED

Tom Miles wrote:
> Jeff,
>
> The slag encapsulation that you see is not unsual when heating straw.  Dirt
> usually just bulks up the slag rather than melting itself. You rinse out
> some of the principle slagging constituents (potassium, chlorine)in the
> wetting and milling but you don't get them all. Even with the rinse you'll
> stil have an ash content of 4-5% in the swtichgrass fireballs. If you
> subject the ash to temperatures above 1450 F (750C) you'll get slagging.
>
> One way to dilute the slagging is to mix in paper and switchgrass fireballs
> or switchgrass and wood. 
>
> Tom  
>
> -----Original Message-----
> From: gasification-bounces at listserv.repp.org
> [mailto:gasification-bounces at listserv.repp.org] On Behalf Of Jeff Davis
> Sent: Monday, January 15, 2007 2:22 PM
> To: gasification at listserv.repp.org
> Subject: Re: [Gasification] Updated Update #2
>
> Dear Tom & All,
>
>
> Tom wrote:
>   
>> If I'm reading it right,
>> it is a downdraft gasifier.
>>     
>
> Yes, open top.
>
>
>
>   
>> I note that you got a LOT of slag.
>>     
>
> There was also a lot of dirt in with my fibres before it was fireballed. I
> need to try to wash this out with water. I wonder if that would help with
> the slagging?
>
>
>   
>> Try filling the tube with charcoal briquettes and then running.
>>     
>
> I wonder how charcoaled switchgrass fireballs would work? Maybe they would
> still slag...
>
>
>
>
> Jeff
>
>
> --
> Jeff Davis
>
> Some where 20 miles south of Lake Erie, USA
>
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