APPLICABILITY OF TDLAS GAS DETECTION TECHNIQUE TO COMBUSTION CONTROL AND EMISSION MONITORING UNDER HARSH ENVIRONMENT

ABSTRACT

Tunable diode laser absorption spectroscopy (TDLAS) has been well-known as an established  detection technique for trace gas molecules and analytical instruments based on this technique  are already commercially available. Practical applications to combustion control and emission  monitoring for incinerators and industrial furnaces often involve considerations about the  technique’s capability to cope with such harsh measuring environmental conditions as high  temperature, high pressure and high humidity. In this study, we theoretically describe the laser  modulation spectroscopy technique and discuss practical applicability of the technique

through  a comparison between laboratory experimental results and theoretical calculations by the use of  a molecular spectroscopic database, stressing on hydrogen chloride (HCl) measurement for  exhaust gas of incinerators. Under experimental condition of elevated temperature, observed  absorption line strength deduced by the second harmonic absorption spectrum of HCl in the  first overtone region shows good agreement with theoretical prediction. This result indicates  that variation of absorption signal due to temperature variation of flue gas can be compensated  if gas temperature is simultaneously obtained.
Keywords: Combustion control; Emission monitoring; Hydrogen Chloride (HCl); Molecular  spectroscopy; Tunable Diode Laser Absorption Spectroscopy (TDLAS)

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