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Gas Analysis

For EME 107B

By Dr. Paul Erickson

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How does one measure gas

(and liquid) products?

• Physical characteristics of each gas? – Batch (grab samples) vs real time

(continuous)

 – Thermal Conductivity – Burn Characteristics (Ionization)

 – Molecular weight

• Reactivity• Interference between gases

• Response of phenomenon (amounts)

• Calibration binding

How do we

know what is in

the gas mixture

if we can’t

calibrate withthat gas

mixture?

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Real Time (Continuous)Systems

• Must separate gases and indicate

quantities

 – Non Dispersive Infrared (NDIR)

 – Fourier Transform Infrared (FTIR)

 – Thermal Conductivity Detectors

 – Combustible gas meters

• Calibration

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Why Dry ?

• NDIR sensor technology

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Radiant Absorption in Atmosphere

(up to 2 micrometers)

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Radiation

Spectra is afunction of

temperature

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CO2 Far IR Absorption Spectrum

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Methane Far IR Absorption Spectrum

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CO Far IR Absorption Spectrum

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H20 Far IR Absorption Spectrum

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Batch Processes

• Require discrete sampling

• Can potentially be analyzed multiple times

and with various methods

Chromatography

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Gas Chromatography

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Thermal Conductivity Detector

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Flame Ionization Detectors

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Mass Spectroscopy