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Show which can approach that of ambient air. In addition, it is desirable to simulate the internal fluid mechanics of a typical RTO in two respects: direction of air flow and injection velocity. Figure 5 shows the modifications made to the basic furnace simulator to emulate a typical RTO environment. Ambient air is injected through ports installed low in the walls of the furnace, which are sized to keep the injection velocity below 1500 ftlminute at maximum flowrate. The furnace is configured to run with ,the center stack, causing the injected air to flow up and across the incoming flame to simulate the perpendicular flow of air to flame in a real RTO. The injected air is provided by an external blower and is not preheated. exhaust burner " -.: -.; I I air air Figure 5. Furnace Simulator Modifications for RTO Research. Initial Research Program To gain experience performing research with the simulator in this configuration and to provide insight into future research directions, an evaluation of the basic performance and flexibility of the unit was initiated. A basic production line burner, the Maxon 4" Series G 'Kinemax' (often used with R TOs) was used. The burner was operated at two nominal loads and at different furnace oxygen contents. In this way, an evaluation of the effect of furnace oxygen content on emissions, particularly NOx emissions, was documented. In addition, the tests were repeated using the furnace simulator's center stack and rear stack, thus demonstrating the effects of different furnace configurations and the overall flexibility of the simulator. RESULTS With each furnace configuration, bulk emissions measurements were taken at the two loads; a 'medium' load of approximately 2MM Btu/hr and an 'elevated' load of 3MM Btu/hr. |
