Method for HCL Monitoring by FTIR Analysis
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Transcript of Method for HCL Monitoring by FTIR Analysis
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MKS Analytical Method for HCl by FTIR
MKS Analytical Method for HCl by FTIR
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FTIR Analysis Method
Analytical Method– Classical Least Squares [CLS]– Predict chemical concentrations using spectroscopy (FTIR) and
linear algebra
Calibration Method– Requires certified gas or liquid standard – NIST Traceable– Collect signal/spectrum from FTIR– Combine and model using CLS– Analysis Region dependant upon component concentration
Determining Sample Gas Concentration– Run sample gas through FTIR gas cell– Collect signal/spectrum from FTIR– Use calibration model to predict sample gas concentration
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Calibration Summary
Region Selection– Select ALL regions where compound is present in the spectrum
Analysis Band– Select the largest peak region– Modify Analysis Band
Other compounds present in Sample Gas and interfereBulk gas or another component fully overlaps any of the analysisregion.
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NO Calibration Regions
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NO Calibration
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0.0%
0.5%
1.0%
1.5%
2.0%
2.5%
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1420
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Machine Independent Calibration
Instrument to Instrument Variation Based on Ethylene Measurements (years 2000 - 2002)
Easily able to transfercalibrations from oneinstrument to another
Demonstration of instrument to instrument variability none of these instruments calibrated for Ethylene
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Analytical Interference Removal
Regions Change with Concentration– Change Analysis Regions
Higher resolution allows analysis in the presence of the interference (usually H20)Spectral Interference Correction (H2O)– Mask Interferences (‘picket fencing’)
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Different Regions for Different Concentrations
8% CO
100 ppm CO
20% CO2
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Low Resolution (2.0 cm-1)
Example of catalyst performance evaluationFigure used with permission from Johnson Matthey plc, Wayne, PA
SampleH2ONO
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High Resolution (0.5 cm-1)
Example of catalyst performance evaluationFigure used with permission from Johnson Matthey plc, Wayne, PA
Sample
H2O
NO
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Removing H2O Interference
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Removing H2O
Sample 150ppm NO in 35% H2O (white) 35% H2O (red)
Sample minus H2O (white) NO calibration (green)
NO Water
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No interference of waterHigh sensitivity
No artificial bias even in very high water (up to 40%)
Low detection limits
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Reduction of Sampling System Interferences
Sample Line TemperatureSample PressureReactive ComponentsMaterial Selection
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FT-IR Sampling System
Heated Probe with filtering– Metal or Glass– <0.1 um recommended (must keep particulate low)
Heated Sampling Line– MKS recommends SS not Teflon for most Apps– Minimum length as possible– Maintain Temp – 191 C normally– Maintain Pressure – 1.0 Atm (+/- 5% recommended)
Sampling Pump– Before or After FT-IR Gas Analyzer
Before be careful about contamination or sample lossAfter be careful not to let pressure go to low
– Additional Filtering Possible if before
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Field Deployable FTIR
Spike Recovery: cal gas 10% total flowCalibrated Gas Run: cal gas 7 lpm if pump pulls 5 lpm
Heated ProbeFilter Box
On-Off Valve
Rotometer
Sampling System
FTIR Gas Analyzer
Cylinder Spike Standardwith SF6 Tracer
Stack
Heated Lines
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Portland Cement Plants Continuous Emission Monitoring
National Emission Standards for Hazardous Air Pollutants From the Portland Cement Manufacturing Industry (40 CFR 63 SUBPART LLL)– Maximum Achievable Control Technology (MACT) Standards
First EPA mandated National Limits to Reduce Mercury and Other Toxic Emissions from Cement PlantsEPA issued final Portland Cement MACT in September 2010
Components required– NOx, SO2, HCl, CO, CO2, PM, THC, mercury
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HCl Measurements with FTIR
EPA Method 321– “Measurement of Gaseous Hydrogen Chloride Emissions At
Portland Cement Kilns by Fourier Transform Infrared (FTIR) Spectroscopy”
– Isolated sample analysis
EPA Method 7E – “Determination of Nitrogen Oxides Emissions From Stationary
Sources (Instrumental Analyzer Procedure)”– Describes general measurements requirements for all gases
when using a continuous instrumental analyzer
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HCl Measurements with FTIR
Sample (white) with 5 ppm HCland 12% water (red)
HCl peaks clearly visible after H2O subtraction
H2O subtraction
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HCl Measurements with FTIR (2)
HClcalibration peaks (red and green)
After HClsubtraction, only noise left
HCl subtraction
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No Interference of WaterHigh Sensitivity
No artificial bias even in very high water (up to 40%)
Low detection
limits
H2O steps up to 40%
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MG2030 CEM Ranges and Detection Limits
Component ppm mg/m3 CH4 0 - 21 0 - 15 CH4 0 - 70 0 - 50 CO 0 - 60 0 - 75 CO 0 - 120 0 - 150 CO 0 - 1200 0 - 1500 CO2 25% 25% H2O 40% 40% HCl 0 - 9 0 - 15 HCl 0 - 55 0 - 90 HCl 0 - 123 0 - 200 HF 0 - 11 0 - 10 N2O 0 - 26 0 - 50 N2O 0 - 51 0 - 100 N2O 0 - 255 0 - 500 NH3 0 - 13 0 - 10 NH3 0 - 99 0 - 75 NO 0 - 149 0 - 200 NO 0 - 299 0 - 400 NO 0 - 1119 0 - 1500 NO2 0 - 24 0 - 50 NO2 0 - 49 0 - 100 NO2 0 - 488 0 - 1000 SO2 0 - 26 0 - 75 SO2 0 - 105 0 - 300 SO2 0 - 699 0 - 2000
Component Detection limit CH4 0.3 ppm CO 0.5 ppm CO2 0.025%H2O 0.25%HCl 0.20 ppm HF 0.25 ppm N2O 0.1 ppm NH3 0.35 ppm NO 0.5 ppm NO2 0.4 ppm SO2 0.6 ppm
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Solution for Compliance of Portland Cement Plants
FTIR designed for Continuous Emission Monitoring– Thermoelectric detector, no need of liquid N2
HCl detection limit of 0.2 ppm– Calculated as 3-sigma in 25% H2O
Typical Gases and Ranges– CH4 0-21 ppm 0-70 ppm– CO 0-60 ppm 0-1200 ppm– CO2 0-25% (soon to 40%)– NOx 0-149 ppm 0-300 ppm– SO2 0-26 ppm 0-699 ppm– H2O 0-40%– HCl 0-9 ppm 0-55 ppm
FTIR associated with FID (THC), PM and mercury sensors for complete solution
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Why MKS Over Competitors
Why MKS Over Competitors
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CEM FTIR
Advantages– Multiple species – one instrument
SO2, NH3, NO, HCl, HF, CO, CO2, H2O, and VOCs– Analyze components in high CO2 and H2O– Direct analysis – no chemical conversion or “fudge factors”– Analysis method minimizes interferents– Flexibility in Changing in Method
Customer can easily modify
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WHY MKS?
Fastest Acquisition with High Resolution (0.5cm-1)Smallest gas cell volume with long pathlength– 200 mL for 5.11m Path
Process Instrument– Not a Lab system converted to Process– Engineered for Process Environment– Gas Cell integrated heaters and pressure controller
Provide Method Development as well as Customer Support