FLARE STACK ANALYSIS PROCESS
In steam-assisted flares, the ratio of steam
to vent gas is critical. Under-steaming
leads to incomplete combustion, while
over-steaming will reduce the efficiency
of the flare. Visible smoke is a clear sign
of pollutants being released into the
atmosphere.
Efficient regulation needs continuous
compositional analysis to ensure the
steam-to-vent-gas ratio is maintained at
its most efficient level and complies with
the CE target.
Servomex’s system, comprising the
SERVOTOUGH SpectraScan 2400 and
the SERVOMEX H2scan working in
combination, gives a continuous reading
with a good compositional measurement.
It measures 14 components, with
an overall BTU value and individual
component values.
The SpectraScan 2400 is a Tunable Filter
Infrared analyzer which can accurately
separate light hydrocarbon components in
the C1 to C6 range. The H2scan uses non-
depleting thin film technology to provide
a direct, real-time hydrogen measurement
that is not cross-sensitive to other gases.
This completely integrated system has
no carrier gas and needs no recalibration
or adjustment, so there are few, if any,
parameters to affect the sample.
The combination of these two technologies
provides a detection system that is simpler
and superior to traditional analysis, with
considerably lower implementation and
product lifetime costs.
Continuous compositional analysis allows
the system to help find the optimum
point between over-steaming and under-
steaming by fast, accurate reporting of
the net heating value of the combustion-
zone gases, taking flare control a step
further than other methods.
The SpectraScan/H2scan system is
so repeatable it is often used as a
benchmark to determine the performance
of analyzers using Gas Chromatography
or Calorimetry.
SERVOTOUGH
Laser 3 Plus Process
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Environmental regulations
itoring of
the world require close mon
utants
the flare stack to prevent poll
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entering the atmosphere.
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Environmental Protection
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hazardous air pollutants.
SERVOTOUGH
OxyExact 2200
Used with a system such as the SpectraScan/
H2scan, a flare stack can be analyzed to
obtain a continuous and precise reading
with good compositional measurements.
or
SERVOTOUGH
SpectraScan 2400
SERVOMEX
H2scan
SERVOTOUGH
Oxy 1900
KEY
APPLICATION
TYPES:
OXYGEN MONITORING REQUIREMENTS
There is also a requirement to monitor
and control the amount of oxygen (O 2 )
in the flare. Monitoring O 2 at the burner
prevents a potentially explosive mixture
of flammable gas and O 2 building up,
eliminating the risk of it igniting and
causing a flash-back of burning gases
into the plant.
Typically, alarms are in place to alert when
the O 2 level exceeds 1%, so accurate and
timely measurement of O 2 is an important
factor in maintaining plant safety.
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The recommended method of determining
the O 2 level in a flare stack is to use an
analyzer fitted with a magneto-dynamic
cell, which measures the paramagnetic
properties of the gas.
Oxygen is paramagnetic where other
gases are not, making the Servomex
Paramagnetic cell in analyzers such
as the SERVOTOUGH Oxy 1900 and
SERVOTOUGH OxyExact 2200 one of
the safest and most reliable means
of monitoring the presence of O 2 in
hazardous situations.
Both analyzers boast an integrated
pressure compensation system that not
only compensates for barometric pressure,
but also for back pressure variations from
flare stacks, enabling emission compliance
targets to be easily met.
Alternatively, the SERVOTOUGH Laser 3
Plus Process Tunable Diode Laser (TDL)
analyzer is optimized for the monitoring
of O 2 in processes where such monitoring
is vital for the safe, efficient and reliable
running of the process, and is essential
for safety applications.
It gives a fast response to measuring O 2 in
flare stacks, using the latest Wavelength
Modulated Spectroscopy measurement
techniques with unique Servomex signal
processing to provide the most stable,
repeatable results with minimal cross-
interference from other gases.
The Oxy 1900, OxyExact 2200 and
Laser 3 Plus are all SIL 2 rated, for easy
integration into safety systems.
Waste gases from various points in the
plant meet at the vent header. Reliable,
accurate and continuous measurement of
O 2 at the vent header is critical to keep
O 2 content at safe levels, preventing an
explosive mixture of gases which could
have devastating consequences for the
plant. In vented hydrocarbons, this safe
level is 0-1% of O 2 , so low-level detection
accuracy is paramount.
The pressure of the vent header is
generally dictated by the process pressures
that connect to it, so the sample may be
considered ‘pressurized’ (i.e. over 16psia).
Servomex process analyzers have been
developed with this in mind, operating
with vent pressures ranging from 18-
45psia, and higher for some applications.
Using these technology solutions, your
plant flares can reach the highest levels of
efficiency and safety, and better comply
with all regulatory standards.
Our O 2 solutions:
servomex.expert/
video-oxygen
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