Vaporization and Thermal Oxidation of Chlorinated Hydrocarbon/Alcohol Sprays

摘要

We report species concentration data obtained during the vaporization and thermal decomposition of polydisperse multicomponent chlorinated hydrocarbon (CHC)/alcohol sprays. Mixtures of 1,1,1-trichloroethane (C2H3Cl3) (TCA) and isopropanol (C3H7OH) are atomized in the postflame environment of a methane/air (U 0.95) flame. Species concentrations, determined by extractive Fourier transform infrared analysis, reveal perturbations in TCA destruction and by-product species formation. The effect of isopropanol addition on by-product species concentrations is similar to previous results involving the thermal oxidation of TCA/alkane mixtures. TCA destruction is incomplete at injection temperatures less than 1000 K. Under these conditions, TCA/isopropanol sprays produce lower residual TCA concentrations than pure TCA sprays. Review of physical property data, numerical modeling (to be published elsewhere), and comparisons with previous experimental results for TCA/heptane and TCA/hexadecane together suggest two primary findings. First, the conventional approach of parameterizing fuel volatility by the fuel saturation temperature at 101.3 kPa does not correlate with the trends evident in our data. For these fuel mixtures and conditions, the latent heat of vaporization (DHv) provides a better correlation. Second, the data also suggest that, for incineration-resistant multicomponent mixtures, the molecular weights of mixture constituents may influence droplet combustion characteristics and should be considered when formulating waste-blending strategies.