GAS-L: Trace contaminant analysis

["Tom Reed" <tombreed@attbi.com>]

Dear All:

I particularly recommend the use of Dragger tubes for occasional analysis of
a large number of gas contaminents such as HCl, COS, H2S, NH3, ...

At http://www.hbcumi.cau.edu/tqp/311/Module%20III/311-38/311-38.html

I found

Two companies supply the tubes, Sensidyne and Dragger. Both provide
handbooks on the chemistry of the tubes and kits and procedures for rapid
assessment of hazardous sites. The calibrated pumps sold by the two
companies are not interchangeable. For general purpose monitoring the EPA
has approved the use of colorimetric tubes for NH3 , CO2 , CO, Cl2 , HCN, H2
S, and SO2 .
They are relatively inexpensive and easy to use. (Not to be confused with
DRAG ER as in dragging airplanes).

Yours truly,                            TOM REED                  BEF

----- Original Message -----
From: "Drift, A. van der" <vanderdrift@ecn.nl>
To: <gasification@crest.org>
Sent: Friday, June 07, 2002 1:12 AM
Subject: RE: GAS-L: Trace contaminant analysis is producer gas


Jerod,

A ECN, we do our measurements of mentioned trace components in the gas from
our gasifiers by the following methods.

H2S and COS are determined on-line by using a µGC and a Poraplot column and
a Themal Conductivity detector.
Sometimes H2S and COS are determined off-line by sampling gas in Tedlar bags
and performing gas analysis on a Gas Chromatograph. H2S and COS are
separated on a CP-SIL 5CB column and detected by using a Flame Photometric
Detector.

HCl and NH3 are determined by leading the gasstream of a biomass gasifier
over a hot quartz fibre filter (250 degr. C) in order to get rid of dust and
soot and after that the stream is passed through a washing bottle,
containing 50 ml of double destilled water. The sample flow is regulated by
a gaspump with rotameter and is about 2 L/min and the sampling time is about
20 min. After this collection time the sample line is being flushed with
double destilled water into the washing bottle. The amount of water is being
transferred into a polyethylene bottle which has been weighed prior to the
measurement and is weighed afterwards in order to determine the amount of
water. After this the sample is being transferred to the lab where HCl is
determined as Chloride using Anion Chromatography and NH3 is determined as
NH4+ by performing Ammonium Flow Injection Analysis (AMFIA).

HCN is sampled with a similar procedure as above, only in this case the
washing bottle is filled with 50 ml of 10M NaOH. On the lab steam
destillation is performed, after which the HCN is determined as CN- by using
a spectrophotometric technique.

Alkali (K and Na) in a gaseous phase are not yet determined on a routine
scale at ECN. We have however some very promising results with a titatium
probe with internal water quench and gas sampling. The resulting condensate
is analysed on Na and K by using ICP-AES.

For more details you can contact me anytime,

Greetings

Bram van der Drift
ECN Biomass
POBox 1
NL  1755 ZG Petten, the Netherlands
tel: (31) 224-564515
fax: (31) 224-568487
Email: vanderdrift@ecn.nl
Email: biomass@ecn.nl


> -----Oorspronkelijk bericht-----
> Van: Jerod Smeenk [SMTP:jsmeenk@iastate.edu]
> Verzonden: 04 June 2002 23:54
> Aan: gasification@crest.org
> Onderwerp: 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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