OCR Text |
Show To determine the relative importance of each of these controlled, measured, and derived variables on the response variables, single term linear mOdels were constructed from the data of the first set of experiments (Table I). Table IV presents the response variance explained for each independent variable examined individually. The results show that the three derived variables of most significance in explaining the variance in the response variables are post flame oxygen flow, stoichiometric ratio, and post flame oxygen partial pressure. As previously mentioned, the experimental design was such that all three of these variables are highly correlated and indicate the oxygen available to the vaporizing waste. Of lesser importance are the variables: total oxygen flow, residence time, adiabatic flame temperature, total flow, primary flame oxygen enrichment, measured kiln temperature, and total air flow. These results indicate that, for the experimental region examined here, transient puffs can be reduced by providing increased oxygen to the waste, and that even though increasing the oxygen flow may change the temperature and residence time, the effects of increased available oxygen dominate. It is important to note that these data indicate only a secondary effect due to temperature, even though previous resu1ts 1,2 indicated that temperature has a major effect on the intensity of transient puffs from batch incineration. Calculated adiabatic flame temperatures for this experimental set vary from 1450 to 2000 K (2150 to 3140 OF), yielding an experimental range of 550 K (990 OF). In actuality, however, the measured kiln exit temperature varies only from 1125 to 1200 K (1565 to 1700 OF); therefore, this actual experimental range of 75 K (135 OF) may be insufficient to establish any temperature effects. Figures 5 and 6 present the single term linear models for post flame oxygen flow and post flame oxygen partial pressure, respectively, versus peak 12 |