Quantification of soot deposit on a resistive sensor: proposal of an experimental calibration protocol

Amel Kort (1, 2, 3) , F-X. Ouf (1) , T. Gelain (1) , J. Malet (1) , Riadh Lakhmi (2, 3) , Philippe Breuil (2, 3) , Jean-Paul Viricelle (2, 3)

1 IRSN/PSN-RES/SCA - Service du Confinement et de l'Aérodispersion des polluants
2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
3 LGF-ENSMSE - Laboratoire Georges Friedel

During a fire in an industrial facility, the main consequences concerning aerosol are the production of large amount of soot and potential resuspension of hazardous material in particulate form. Soot deposition quantification on walls in a room during a fire is essential for the prediction of aerosol quantities that can be transported in the ventilation ducts and clog high efficiency particulate air filters. For this purpose, accumulative resistive sensors, initially developed for monitoring Diesel Particulate Filters (DPF), have been used to quantify soot particles that are deposited on its sensing side. After validation of the fabrication process via electrical measurements, the sensor response has been studied under different polarization voltages and an experimental protocol for soot quantification has been qualified. Thanks to those protocols, it was first demonstrated that the polarization voltage has no influence on the deposition velocity. Then, the resistive sensor was calibrated at polarization voltages of 10 V and 0.1 V. For 0.1 V, results are less repeatable and do not allow to propose a correlation between conductance and deposited mass. Better repeatability was found for a polarization voltage of 10 V allowing to propose and develop a calibration procedure aiming to correlate sensor conductance and deposited mass of aerosol. Indeed, it was proved that the sensor has a blind zone, in terms of conductance, for mass deposit ranging from 0 to 230 mg/m². A linear calibration curve with a good sensitivity of 2.49 µS.mg-1.m² was obtained for deposited mass between 230 and 1630 mg/m².

Mots clés: Resistive sensor; soot; polarization; conductance; quantification

Domaines: Génie des procédés

Amel Kort, F-X. Ouf, T. Gelain, J. Malet, Riadh Lakhmi, et al.. Quantification of soot deposit on a resistive sensor: proposal of an experimental calibration protocol. Journal of Aerosol Science, 2021, 156, pp.105783. ⟨10.1016/j.jaerosci.2021.105783⟩. ⟨emse-03203120⟩