10 Questions
Which method is suitable for detecting carbon dioxide (CO2), carbon monoxide (CO), sulfur and nitrogen compounds, methane, and other hydrocarbons?
Non-dispersive infrared (NDIR)
Which gas compounds are not detected by the non-dispersive infrared (NDIR) method?
Oxygen, hydrogen, and nitrogen
Which method is commonly used for nitrogen oxides (NOx) detection?
Chemiluminescent
Which type of flue gas analysis involves sending a light source across the interior diameter of the stack to a detector?
Cross-stack analysis
Which type of flue gas analysis is performed by inserting a probe into the stack at a precise point for measurements?
Probe analysis
Which type of extractive monitoring involves continuously extracting and transporting the flue gas from the sampling point, through a conditioner, and to the analyzer?
Direct extractive analysis
Which technology uses infrared sensors where light of a known wavelength is absorbed by a gas to analyze flue gas components?
Optical methods
Which of the following is NOT a typical automatic flue gas analyzer?
An analyzer that measures the water vapor content of the sample
What is the difference between wet analysis and dry analysis of flue gas samples?
Wet analysis includes water vapor as one of the constituents of the flue gas, while dry analysis does not
What is in situ monitoring?
Monitoring the flue gas by inserting an instrument into the stack or vessel without removing any gas from the process
Study Notes
Flue Gas Analysis Methods
- Non-dispersive infrared (NDIR) method is suitable for detecting carbon dioxide (CO2), carbon monoxide (CO), sulfur and nitrogen compounds, methane, and other hydrocarbons.
- NDIR method does not detect nitrogen oxides (NOx), ammonia (NH3), and hydrogen sulfide (H2S).
Nitrogen Oxides (NOx) Detection
- Chemiluminescence method is commonly used for NOx detection.
Flue Gas Analysis Techniques
- In-situ method involves sending a light source across the interior diameter of the stack to a detector.
- Extractive method involves inserting a probe into the stack at a precise point for measurements.
- Extractive monitoring involves continuously extracting and transporting the flue gas from the sampling point, through a conditioner, and to the analyzer.
Infrared Technology
- Infrared sensors use light of a known wavelength that is absorbed by a gas to analyze flue gas components.
Automatic Flue Gas Analyzers
- None of the following are typical automatic flue gas analyzers: gas chromatographs, mass spectrometers, and titrators.
Flue Gas Analysis Types
- Wet analysis involves the use of a liquid solvent to extract the analyte from the flue gas sample.
- Dry analysis involves the use of a solid or semi-solid material to extract the analyte from the flue gas sample.
In Situ Monitoring
- In situ monitoring involves the analysis of flue gas components directly within the stack, without the need for sample extraction or transport.
Test your knowledge on typical automatic flue gas analyzers in this quiz. Learn about the different devices used to analyze flue gas and measure carbon dioxide (CO2), oxygen (O2), carbon monoxide (CO), and hydrogen (H2) content.
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