[Gasification] "Continuous analysis of elemental emissions from abiofuel gasifier"

[Ken Boak]

GF & list,

I had considered something similar using a carbon arc as a final 3600C 
thermal clean-up stage.

If it can be arranged that the gas passes through the arc, and the 
electrodes for the arc are the actual carbon from the fuelstock then it 
would be quite interesting.


Ken


----- Original Message ----- 
From: <gfwhell at aol.com>
To: <LINVENT at aol.com>; <Doug.Williams at orcon.net.nz>; <praufast at free.fr>; 
<Gasification at listserv.repp.org>
Sent: Saturday, March 24, 2007 10:56 PM
Subject: Re: [Gasification] "Continuous analysis of elemental emissions from 
abiofuel gasifier"


> Tom.
>
> It has occurred to me, that it should be possible to pass the gas through 
> a final process in order to break down and remove the pollutants still 
> remaining in the gas stream.
> The pollutants you mention having a higher "break down temperature" than 
> attainable in the gasifier.
> How about subjecting the gas stream to a high IONIZING voltage?
> and use "ANODES" or Cathodes to collect the heavy metals?
>
> GF
>
> -----Original Message-----
> From: LINVENT at aol.com
> To: Doug.Williams at orcon.net.nz; praufast at free.fr; 
> Gasification at listserv.repp.org
> Sent: Sat, 24 Mar 2007 5:02 PM
> Subject: Re: [Gasification] "Continuous analysis of elemental emissions 
> from abiofuel gasifier"
>
>
> Whatever parties have found in analyzing gasification, the US EPA 
> considers
> it to the be Maximum Attainable Control Technology for operating gas 
> turbnes,
> and actively promotes it for conversion of hazardous wastes into 
> electricity or
> synthetic fuels.
>
> What has to be considered is that the contaminants which may be present in
> the gas stream emanating from the gasifier reactor are typically condensed 
> in
> cleaning and cooling the gas. Once the gas temperature is dropped, any
> volatilized metals tend to condense and precipitate on cool surfaces. Tars 
> do
> the same.
> Tars contain trace element metals which prevent the use of raw gas as a 
> fuel
> as in close coupled devices without some particulate contamination and
> possibly heavy metal contamination post combustion use.
>
> Take a metal like cadmium. It's boiling point is higher than most 
> gasifiers
> operate at and immediately upon leaving the reactor, it would condense. 
> Other
> heavy metals would likewise do the same. Mercury is a ubiquitous 
> contaminant
> amongst pulverized coal fired systems, but is in minor amounts in coal 
> fired
> IGCC systems. If there were metals present in any significant amount in 
> gas
> turbine firing, the turbine blades would coat up and become unbalanced, or 
> be
> subject to erosion and premature failure.
>
> An interesting fact is that most pulverized coal systems are subject to
> severe ash fusion and slagging which reduces continuous operation time and
> requires
> extensive repair when the tubes are damaged from falling alsg. Gasifiers 
> do
> not have this problem. For this reason, they are more reliable.
>
>
>
> Sincerely,
> Leland T. Taylor
> Leland T."Tom" Taylor
> President
> Thermogenics Inc.
> 7100-F 2nd St. NW Albuquerque, NM 87107
> Phone:505-463-8422 Fax:505-268-9206 (call first)
> Web:thermogenics.com
>
>
>
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