isa qatar : 90th seminar - aims qatar - aims.pdf · points considerations in process analyzers 33....
TRANSCRIPT
![Page 1: ISA QATAR : 90th Seminar - AIMS QATAR - AIMS.pdf · Points considerations in Process Analyzers 33. No heating/ Jacketing ... • Aims studied the case and proposed AMETEK 5100-HD](https://reader034.vdocument.in/reader034/viewer/2022052008/601d72ce36deea2b0138066a/html5/thumbnails/1.jpg)
ANALYTICAL INSTRUMENTATION &
MAINTENANCE SYSTEMS (AIMS)
“UTILIZATION OF LASERS IN THE FIELD OF GAS ANALYZERS”
Presenter:
ZAHEER JUDDY
ISA QATAR : 90th Seminar
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Electromagnetic Spectrum
Analytical Instrumentation & Maintenance Systems(AIMS)
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5510 10 10 10 10 10 10 10
9 7 5 3 1 -1 -3 -
Wavenumbers
x-rays
ultraviolet
Vis
NIR
mid -IR
FIR
microwave
radio waves
nuclear electronic vibrational transitionsrotational
10 10 10 10 10 10 10 109 7 5 3 1 -1 -3 -
Wavenumbers
x-rays
ultraviolet
Vis
NIR
mid -IR
FIR
microwave
radio waves
Wavelength in Nanometers
nuclear electronic vibrational transitionsrotational
180 1000 25000
Analytical Instrumentation & Maintenance Systems(AIMS)
Electromagnetic Spectrum
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Traditional techniques/approach in process Gas Measurements
• Non-Dispersive & Dispersive Infrared
• Non-Dispersive & Dispersive Ultraviolet
• Contact type measurement
Analytical Instrumentation & Maintenance Systems(AIMS)
• Tunable Diode Laser Absorption Spectroscopy (TDLAS)
Next Generations
Analytical Instrumentation & Maintenance Systems(AIMS)
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Infrared (IR) Technology
About & Challenges• Very Old & First technology• Suitable for only measurement of Hetro-atomic molecules• Moisture interference with IR• Not suitable for interfering background Gases and components• Complex Sampling design with removal of moisture MUST….
• Increased number of consumables and spares
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NDIR Photometry:• AGAIN!! A complexity of optical design with lot of
optics components.
Analytical Instrumentation & Maintenance Systems(AIMS)
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Components – IR analyzer:
• Degradation of NDIR source.
• Contamination of filters.
• Wide band width (CO2/CO) together difficulties
NDIR source
Filters
background interference
Analytical Instrumentation & Maintenance Systems(AIMS)
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Ultraviolet (UV) Technology
UV Optics Assembly
Few Challenges:• Shorter lamp life• Wide emission line widths &
wide Spectral range.
• Contamination of filters.
• Moving parts• Replacing the filter wheel
motors.
Analytical Instrumentation & Maintenance Systems(AIMS)
Good for sulfur speciesH2S, SO2, COS, CS2, etc..
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Filter Location Table (COS / CS2 Measurement)
Filter Position 1 2 3 4 5 6
Wavelength 258 228 404 232 280 326
Primary
MeasurementSv H2S NDr COS SO2 CS2
Lamp Mn/Ni Cd Mn/Ni Mn/Ni Mn/Ni Cd
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Traditional Contact type Moisture & Oxygen Measurement
Moisture Measurement
1. Aluminum Oxides– Response Time in minutes/hours
– Sensor Probe Chocking
– Always affected by Glycol, H2S/HCL, mercury and others
– Difficulties in calibration
2. QCM (Quartz Crystal Microbalance)– Faster response & good for low ppm
measurement
– Sensor killing by background corrosive gases
Oxygen measurement
Zirconium Oxide (ZrO2)
– Selective for flue gases and clean applications
– Affected by dust, background mist and hydrocarbon gases
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Think Out Of The Box????
The only tool
when you
have in your
hand is
HAMMER,
every thing
around looks
like NAIL .
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AMETEK 5100HD PROCESS GAS ANALYZER
Analytical Instrumentation & Maintenance Systems(AIMS)
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AMETEK Model 5100HD Overview
• The AMETEK 5100 series TDLAS gas analyzer is an extractive system & NON Contact type measurement
• All these species can be measured in variety of background gases
• There are two versions available. The Model 5100 is single laser, single analyte configuration.
• Model 5100HD is dual laser, single/multiple analyte single/dual cell configuration.
• Model 5100HD has dual stream capability.
• The unit is comprised of fully enclosed optics, electronics, sample handling and built-in verification.
• The unit is certified for worldwide hazardous area locations.
• comes with built-in verification and laser line lock as standard.
Analytical Instrumentation & Maintenance Systems(AIMS)
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AMETEK Model 5100 Overview
Gases Measured• Moisture
• Hydrogen Sulfide
• Carbon Dioxide
• Carbon Monoxide
• Oxygen
• Methane
• Ammonia
• Hydrochloric Acid
• Acetylene
……many more coming
Analytical Instrumentation & Maintenance Systems(AIMS)
Industries Served• Natural Gas Pipeline
• Natural Gas Processing
• Refinery
• Chemical
• Petrochemical
• Hi Purity Gas
Many more……..
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Why Tunable Diode Laser Spectroscopy?
• Non-contact measurement technique– No sensor aging calibration concerns
• No consumables– Advantage for applications with high levels of water vapor
– Lasers last many years before replacement is needed
– Low cost of ownership
• No interferences– Extremely narrow emission line widths reduce interferences from
other species
Analytical Instrumentation & Maintenance Systems(AIMS)
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Electromagnetic Spectrum:
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Wavelength modulation spectroscopy…
For First harmonic (1f ) detection, the detector signal is
demodulated using a reference signal with a frequency
equal to that (of the modulation frequency ) used to drive
the laser..
For Second harmonic (2f )detection, the detector signal is
demodulated using a reference signal twice that used to
drive the laser…..
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18
Vibrational Spectroscopy & Lasers• The absorption of infrared radiation results in unique
molecular vibrations
• In the gas-phase samples the individual transitions between discrete vibrational states are observed when measuring with high resolution
• Lasers have extremely narrow emission lines; hence, they are an excellent tool to probe the unique absorptions of gas phase molecules
O O O
H H H H H H
1
2
3
Normal Vibration Modes for Water
Analytical Instrumentation & Maintenance Systems(AIMS)
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Modulation and Absorption ResponsesLaser Current
Detector Response
Water Absorption Modulated Laser Signal0 0.05 0.1 0.15 0.2 0.25
65
70
75
80
85
90
95
Time (seconds)
Cu
rre
nt
(mA
)
759.950
0.2
0.4
0.6
0.8
1
Wavelength
(nm)
Tra
nsm
issio
n
0 0.05 0.1 0.15 0.2 0.250
0.2
0.4
0.6
0.8
1
Time (seconds)
Respons
e
Analytical Instrumentation & Maintenance Systems(AIMS)
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Analyte, typical absorption line width 0.05 nm
Laser scan range, typically 0.2 - 0.3 nm,
Laser spectral line width is ca. 0.0001 nm
Conventional optical filter bandwidth > 5 nm
Analytical Instrumentation & Maintenance Systems(AIMS)
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5100 – Block & flow Diagram
Laser
Diode
ELectronics
Unit
TemperatureControl
Current
Control
MirrorGRIN Lens
Photodiode
GRIN Lens
Photodiode
Beam Splitter
Sample cell
Reference CellLaser
Diode
ELectronics
Unit
TemperatureControl
Current
Control
MirrorGRIN Lens
Photodiode
GRIN Lens
Photodiode
Beam Splitter
Sample cell
Reference Cell
Analytical Instrumentation & Maintenance Systems(AIMS)
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Comparison of Water and Natural Gas
Water vapor spectrum
offset for clarity
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 18600
0.2
0.4
0.6
0.8
1
Wavelength (nm)
Rela
tive A
bsorb
ance
1.854 um, 5394 cm-1Water Vapor
Natural Gas
Analytical Instrumentation & Maintenance Systems(AIMS)
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Key feature of 5100 : Line-Lock• By adjusting the TEC temperature, the analyzer will tune the
laser to emit a specific frequency that would be absorbed by the analytes.
• check the peak (“line”) in the spectrum.
• The peak (“line”) is locked if its index is at a certain position in the spectrum, varying by a “line-lock” window.
Line Locking under Laser Temperature
of 27.55°C. Reference and Sample
Spectra
Spectral Index
0 50 100 150 200
2F
Sig
na
l
-0.01
0.00
0.01
0.02
0.03
27.4°C
26.8°C
25.5°C
25.55°C
25.54°C
Spectral Index
0 50 100 150 200 250
2F
Sig
na
l
-0.08
-0.04
0.00
0.04
0.08
0.12
Analytical Instrumentation & Maintenance Systems(AIMS)
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Advantages of LASER:
Analytical Instrumentation & Maintenance Systems(AIMS)
• Precise measurement
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Advantages of LASER:
Analytical Instrumentation & Maintenance Systems(AIMS)
• Precise measurement
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DFB Tunable Laser Diode –The Heart of it All
• Very Accurate!! – Can be tuned to measure to the accuracy level.
Analytical Instrumentation & Maintenance Systems(AIMS)
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Laser/Fiber Panel – 5100
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Reference Cell – TDLAS
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Verifying the Reference cell function:
Analytical Instrumentation & Maintenance Systems(AIMS)
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Sample cell
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Select Wisely:
Don’t Load all your application on
LASERS, you need to be careful on
the following.
• Always provide complete stream composition.
• Moisture and H2S in nitrogen is
dif ferent than moisture
and H2S in methane.
• Proper sampling system
Analytical Instrumentation & Maintenance Systems(AIMS)
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COMMON ISSUES WITH SAMPLING SYSTEM
1. Sample Line Issues – Longer distance???
– As near as tapping point possible (less than 10 meters)
2. Probe Installation Issues
3. Big SHELTER/HVAC Issues – Maintenance issues
4. Location of Tapping Points – difficult to install and maintenance
5. SS 316 Electro‐Polished Tubes
6. Range issues for Analyzers
7. High H2S Exposure
Analytical Instrumentation & Maintenance Systems(AIMS)
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Points considerations in Process Analyzers
33
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No heating/ Jacketing
Proper Probe Heating with
Jacketing
Probe Installation Issues
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Probe selection for high pressure process line Analyzers
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Difficult location for Probe installation
Probe Installation Location
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Heated Sample line selection & Installation
Proper bending & Installation of sample line
by AIMS
Shortest length between tapping point and analyzer less than 10
meters
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Poor Installation – sample line
Analytical Instrumentation & Maintenance Systems(AIMS)
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Sample installation Best Practices
Analytical Instrumentation & Maintenance Systems(AIMS)
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Correct type of Heated Sample line selection
• Teflon: Inert but temperature limitations (dewpointtemperature), permeation
• Stainless Steel: welded, seamless but cleanliness and adsorption problems with some applications
• ElectroPolished: improved surface finish for improved absorption resistance
• ElectroPolished/Coated: for a product that is inert as Teflon but strong as steel
Weatherproof Jacket
“Insulation
Steam Traced
Process Lines
Steam Supply & Condensate Return
Electric Traced
CEMS Designs
Buffered High Temp Bundle
Analytical Instrumentation & Maintenance Systems(AIMS)
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Case Study 1 : ZADCO
Analytical Instrumentation & Maintenance Systems(AIMS)
• Analyzer application : ZADCO off-shore plant• Service : Glycol Dehydration Unit• Issue : Glycol & Liquide Carryover • Played with all the traditional techniques and was
failing. • Aims studied the case and proposed AMETEK 5100-HD
for the application. It has now been 5 years they are running smoothly.
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Data Sheet
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Case Study 2 : GASCO
Analytical Instrumentation & Maintenance Systems(AIMS)
• Analyzer application : Acid Gas Flare
• Measurement O2 in ppm : Range 0-1000ppm.
• H2S in the stream is 20%
• Analyzer is in ESD loop
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Data Sheet For Case 2
Analytical Instrumentation & Maintenance Systems(AIMS)
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Case Study 3: QP
Analytical Instrumentation & Maintenance Systems(AIMS)
• Service : Recycle Gas compressor suction
• Application : Moisture measurement.
• Process stream contains 15 ppm Chlorine (HCL).
• Existing : Al2O3
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Data Sheet For Case 3
Analytical Instrumentation & Maintenance Systems(AIMS)
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Case Study 4 : PDO OMAN
Analytical Instrumentation & Maintenance Systems(AIMS)
• Analyzer application : Acid Gas Flare
• Measurement O2 : 0-2%
• H2S in the stream
• Analyzer is in ESD loop
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Installation in PDO, OMAN
Analytical Instrumentation & Maintenance Systems(AIMS)