Numerical and experimental studies of cc1₄destruction in a dump incinerator

Abstract

We undertook numerical and experimental studies to develop a better incineration method for the destruction of CCl4. A phenomenological model for the turbulent reaction of CCl4, 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-epsilon turbulence model. A modified fast chemistry turbulent reaction model was developed to describe the flame inhibition due to the presence of CCl4, 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 CCl4, 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.

Comprehensive modeling of HFC-23 incineration in a CDM incinerator

“…Although mixing limited turbulence only models have been shown to be successful tools in predicting the overall profiles of the main species, serious drawback exist, since the conventional fast chemistry turbulent reaction models such as the conserved scalar method of Bilger [13] and the eddy breakup models of Spalding [14] and Magnussen and Hjertager [15] do not describe the non-equilibrium characteristics of halogen compounds. Even if a series of research efforts of nonequilibrium turbulent modeling have been made for the specific halogenated material such as CCl 4 [16][17][18][19][20][21], in general there is no general predictive model available to deal with halogenated hydrocarbon. Therefore, suitable modeling procedure should be made specifically for each compound according to the characteristics of the Damkohler number of each compound in turbulent reacting flows.…”