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Measuring biogas composition with a compact MEMS based spectrometer


In order to operate a demand driven anaerobic digester, improvements to monitoring of process parameters are necessary. Therefore a mid infrared spectroscopic gas sensor utilizing a MEMS (Microelectromechanical systems) based Fabry‐Perot interferometer was tested for its suitability to measure the biogas concentration online. The sensor measures from 3,000nm – 3,700nm. The spectral data is analyzed using principle component regression to make predictions of methane and carbon dioxide. RMSEP values were 0.95% and 2.75% respectively. Testing was performed in a laboratory, at a 1000L pilot scale digester, and at a 1.2MW landfill site. Scans took under 8 minutes during testing and it is expected that this can be reduced further to give a shorter delay from the online measurements.

Autoren:   Robin Eccleston, Michael Bongards
Journal:   Chemical Engineering & Technology
Jahrgang:   2018
Seiten:   n/a
DOI:   10.1002/ceat.201700392
Erscheinungsdatum:   17.01.2018
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