| OCR Text |
Show TEST PROGRAM To address the i ss ues cited above, seven test series were run, as follows: I Baseli ne fuel only I I Baseline cofiring III Data variability, replication, and hysteresis IV Evaluation of operational window for high destruction V Form and fate of trace metals VI Evaluation of PIC production VII Confirmatory tests The series I and II baseline tests were run to obtain reference levels of waste and PIC emissions under well-controlled operation and for clean heat exchange surfaces in the facility. These results were used for referencelevel comparison to later runs in series III and IV as deposits continued to build on heat exchange surfaces, thereby indicating the relative magnitude of background levels of organics and the transient, hysteresis, buildup of the background. Series III was intended to gauge the confidence level in the destruction data relative to variability and reproducibility effects. With this level established, the remainder of the test plan was directed at determining the effect of operating conditions on POHC, PIC, and metal emissions. Series IV provided for parametric testing of various off-design and upset operating conditions to attempt to define the operating boundary of the high ORE window. Operating parameters tested included low excess air; atomizer upsets; heat exchange designs affecting residence time and firebox temperature; firing capacity; and waste or fuel flow transients. Series V focused on doping the flame with metal species of interest in the regulatory process: arsenic, cadmium, chromium, and lead, and sampling for metal concentrations in several size fractions. Series VI featured a spot check of substituting inorganic chloride for the chlorinated waste to determine if waste identity influences PIC identity over and above the presence of chlorine. The final runs in series VII were designed to test conditions which, on the basis of prior results, showed potential for confirmation of ORE levels and trends. TEST FACILITY The pilot-scale facility used for these test series is a refractory-lined furnace and convective section designed with geometric similarity and' time-temperature simulation of a tangentially or wall-fired watertube boiler, as shown in Figure 1. For the present tests, the unit was fired in the wall-fired mode, typically with gas, oil, or coal fired through three of the burners and a simulated waste through the remaining burner. The fuel feed system, cooling system, and post-combustion cleanup system are shown 4 ) |
