|
Using
UV-Fluorescence detection technology
Applications
- Refinery
flare monitoring - 40 CFR 60 Subpart
Ja installations
- Hydrogen
plant steam methane reformer (SMR)
for catalyst protection
- LNG
monitoring of sulfur impurities
- Refinery
feed gas to hydrogen plant
This
Model 6400-TSG system uses UV-Fluorescence
detection technology to analyze total
sulfur concentration in gas samples.
It consists of a Model 6400E UV Fluorescence
Sulfur Dioxide Analyzer, a Flame Combustion
Converter Module (FCCM), and associated
sample handling required per application.
The system is housed in a freestanding
NEMA-4 or NEMA-4X rated enclosure with
approved purge, making it suitable for
operation in Class I Div 1 (Zone 1)
or Class I Div 2 (Zone 2) environments.
Advantages
- Trace
and percent analysis ranges available
- Continuous
analysis - fast response time and
no switching valves
- Non-consumable
sensing technology
- High-temperature
flame combustion converter module
ensures complete sulfur conversion
- Minimal
preventative maintenance for less
down-time
- No
pure oxygen required as a utility
gas
- Single
and multiple sequenced stream configurations
available
- Speciating
configurations available using integral
chromatography
- Class
I Div 1 (Zone 1) and Class I Div 2
(Zone 2) configurations available
Theory of Operation
The
undesirable sulfur compounds present
(i.e. H2S, DMS, COS, CH3SH, CS2, etc)
are converted into sulfur dioxide (SO2)
under precisely controlled temperature
and flow conditions.
SO2
+ hv¹ -> SO2*-> SO2 + hv²
When SO2 is exposed to UV light energy,
hv1, it creates an "excited"
form of sulfur dioxide, SO2*. A molecule
in a high, vibrational level of the
excited state, SO2*, will quickly fall
to its lowest vibrational level by losing
energy to other molecules through collision.
Fluorescence occurs when the molecule
returns to its electronic ground state.
The intensity of the emitted light,
hv2, is directly proportional to the
total sulfur content found in the sample.
The
converted sample gas is dried, then
fed to the Model 6400E UV Fluorescence
Analyzer where the SO2 Analysis takes
place and is conveniently displayed
as Total Sulfur.
|
