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

[LINVENT at aol.com]

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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