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DETECTION, EN TEMPS REEL, D'ELEMENTS METALLIQUES PRESENTS DANS LES REJETS ATMOSPHERIQUES INDUSTRIELS PAR TORCHE A PLASMA A COUPLAGE INDUCTIF

Abstract : This work is devoted to the development of a process of detection in real time of metallic pollutants present in industrial atmospheric effluents. The method of measurement is the atomic spectrometry of emission coupled to an ICP torch (Inductively coupled Plasma). The technology of the fluidized beds is used as system of introduction of the metallic particles into the ICP torch, the interest of the principle of detection resting on the stamping from the usual procedure of calibration of the analytical system.
The results are presented in two parts. The first relates to the diagnosis of plasmas formed with various mixtures of N2/O2 which one corresponds to pure air, the second presents the setting process of detection in real time starting from the intensities ratios of the spectral lines of the metallic element with those of the plasma-producing element (argon or pure air)
The study of the diagnosis of plasmas made up of mixtures N2/O2 relates to the determination of the atomic excitation temperature from the spectral lines of the copper element and the evaluation of the thermal disequilibrium q = Te/Th . This last is obtained by considering the massic enthalpy of various mixtures N2/O2. The existence of a small thermal disequilibrium (q£1,2) is highlighted.
The study of detection in real time by ICP torch, without calibration of the system, is based on three points:
- spectroscopic data processing to determine the values of the intensities ratios of spectral lines;
- the insertion of the intensities ratios and the characteristics of plasma (argon or pure air) into a calculation code of plasma composition;
- the comparison of the mass flux values of the metallic pollutants, in real time, obtained by experimences with those resulting from the elutriation calculation , term which defines the phenomenon of entrainment of the particles out of the fluidized bed. The results made it possible to show the similarity of the analytical system response between the use of argon plasma and that of air.
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  • HAL Id : tel-00011712, version 1

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Damien Vacher. DETECTION, EN TEMPS REEL, D'ELEMENTS METALLIQUES PRESENTS DANS LES REJETS ATMOSPHERIQUES INDUSTRIELS PAR TORCHE A PLASMA A COUPLAGE INDUCTIF. Physique [physics]. Université Blaise Pascal - Clermont-Ferrand II, 2001. Français. ⟨tel-00011712⟩

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