estudio y caracterización de un plasma de microondas a presión ...

Destrucción de VOCs con plasma de Helio
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2.4. Conclusions
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Figure 2.13: Rotational bands of C 2 in the discharge.
The proposed plasma system for destroying volatile organic residues is effective
in respect of decomposing trichloroethylene. Its destruction efficiency increases with
increasing applied microwave power, but the achieved percentage of destruction is
99.99% at 300 W. An optimum flow-rate range exists at each diameter of the coupler tip
that corresponds to a gas velocity of ca. 35 m/s. This, together with the ability to replace
the tip with another one of a larger diameter, allows the efficiency of the process to be
raised to levels up to 600 g/kW·h.
Cu I
C 2 Rotational Bands
Helium plasma
Flow rate: 1 L/min
MW power: 600 W
1000 ppmv C 2 HCl 3
Wavelength (nm)
Consistent with previous results, the percentage of destruction of the proposed
system increases with an increased input concentration of C2HCl3,
The analysis of by-products of the process revealed that the output concentration
of C2HCl3 upon treatment in the plasma falls in the ppbv range under optimal conditions
and that the treatment generates two other volatiles (ClCl4 and C2Cl4), both at a