FW: GAS-L: Trace contaminant analysis is producer gas

["Schmidt, Darren" <dschmidt@undeerc.org>]

-----Original Message-----
From: Timpe, Ronald C. 
Sent: Thursday, June 06, 2002 11:46 AM
To: Schmidt, Darren
Subject: RE: GAS-L: Trace contaminant analysis is producer gas


Darren,

There are on-line instrumental methods for measuring H2S,COS, HCl, NH3, HCN,
(Gas Chromatography, spectroscopic methods and others).  HCl and NH3 are
very hydrophilic so tend to dissolve in condensate (H2O). Laboratory
analysis of condensate gives good indication of those gases. Gas is
sometimes collected in bags and taken to the lab for analysis, remembering
that most of the HCl and NH3 will be in condensate and not give a reliable
result in gas bag analysis. If the condensate water is alkaline, H2S and HCN
will also partition into the condensate so the condensate must also be
analyzed.  COS hydrolyzes in the condensate (to H2S and CO2)so will not be
measured as COS.  K (potassium) and Na(sodium)is collected in impinger
trains and brought back to the lab for analysis. Flame photometry is used in
our lab for K and Na analyses.  As far as I know there is not an on-line
method for the latter two at this time.  They are so soluble in water that
they tend to dissolve in condensate so condensate analysis gives a good
indication of K and Na vapor in the gas stream.   

Ron Timpe
UNDEERC
rtimpe@undeerc.org
(701)-777-5219


-----Original Message-----
From: Schmidt, Darren 
Sent: Thursday, June 06, 2002 10:03 AM
To: Timpe, Ronald C.
Subject: FW: GAS-L: Trace contaminant analysis is producer gas


This fellow asked me this question.  What do we use to measure the elements
he requested?

-----Original Message-----
From: Jerod Smeenk [mailto:jsmeenk@iastate.edu]
Sent: Tuesday, June 04, 2002 4:54 PM
To: gasification@crest.org
Subject: GAS-L: Trace contaminant analysis is producer gas


All,

Has anyone established procedures for analysis of trace contaminants in gas 
streams from biomass gasifiers?  I am interested in either on-line or 
off-line gas sampling techniques.  Contaminants of interest include H2S, 
COS, HCl, NH3, HCN, and alkali (K and Na).  Thanks in advance!

Jerod

----------------------------------------------------------------------------
-------------
Jerod Smeenk                    Phone:  (515) 294-6402
Iowa State University                   Fax:  (515) 294-3261
1043 Black Engineering          E-mail: jsmeenk@iastate.edu
Ames, IA 50011



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