NUMERICAL AND EXPERIMENTAL STUDIES OF CCl_4 DESTRUCTION IN A DUMP INCINERATOR

摘要

We undertook numerical and experimental studies to develop a better incineration method for the destruction of CCl_4. A phenomenological model for the turbulent reaction of CCl_4, including a flame inhibition feature, has been successfully incorporated into a commercial code, simulating the incineration processes of this compound. The gaseous flow solution was obtained using SIMPLEST, a derivative of Patankar's SIMPLE algorithm, with a k-ε turbulence model. A modified fast chemistry turbulent reaction model was developed to describe the flame inhibition due to the presence of CCl_4, considering the corresponding burning velocity data of these mixtures. An experiment was carried out on a small-scale, transportable, dump-type incinerator, which warrants a sufficient residence time and effective turbulent mixing by the formation of a strong recirculation region in a combustor. To this end, the specific configuration of the incinerator was manufactured to consist of two opposing jets and a rearward facing step. The calculated data were in close agreement with the experimental data for the concentrations of major species, such as CCl_4 and HCl, together with the temperature profiles. The dump incinerator satisfied the orders required by the EPA of 99.99% ("4 nines") DRE for hazardous waste incinerators.