| OCR Text |
Show CONCLUSIONS The results of experiments involving the use of oxygen enrichment via the primary flame (primary combustion chamber) of a rotary kiln incinerator simulator feeding batch charges of contained liquid surrogate waste (toluene) on corncob sorbent are consistent with results previously presented by the authors. 1,2 A summary of the results from this study includes: 1. The phenomena associated with transient puff formation from the batch introduction of contained waste are fundamentally different from those associated with steady-state incineration. The realization of these differences is important in order to minimize organic emissions. 2. Although increased temperatures associated with oxygen enrichment may provide potential benefits for steady-state incineration, these increased temperatures are detrimental in controlling transient puffs from contained wastes. This was especially true for particulate emissions. 3. It is difficult to draw conclusions regarding the individual effects of stoichiometric ratio, or post flame oxygen flow, or post flame oxygen partial pressure due to the confounding effects of temperature. 4. When the effects of temperature are removed, oxygen enrichment causes a reduction, beyond simple dilution, in the magnitude and intensity of transient puffs from contained wastes. 5. If temperature increases can be controlled (e.g. by using advanced forms of process control), oxygen enrichment may cause net decreases in transient puff emissions. Results of planned tests on such a system at EPA's Combustion Research Facility in Arkansas may provide these answers. 6. Oxygen enrichment may cause unacceptable emissions of nitrogen oxides (NOx) even at baseline conditions burning clean auxiliary fuel due to thermal fixation of ambient nitrogen. These emissions may be exacerbated if high 16 |
