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Show used alternately: the rear stack to simulate continuous industrial processes and the top stack to simulate batch-type industrial processes. The other features of the UCICL furnace simulator include an internal cooling system to simulate an internal charge; sampling ports to facilitate in-furnace testing; viewports to provide visual access; and a removable burner mounting plate for versatility (Weakley, 1996). Figure 1 shows schematics of the furnace. The burner used for this research is a specially designed analog of a practical burner, with burner geometry designed and fabricated to allow interchanging parts and, hence, configurations. Samples are extracted from a specified stack through a heated probe to the analyzers. Emissions are measured by the emission sampling system which includes carbon monoxide (CO), carbon dioxide (CO2), unburned hydrocarbons (HCs), oxygen (O2) and N O x analyzers. Figure 1: U C I C L High-Temperature Furnace Simulator, (L) viewport side view, ( M) sampling port side view, (R) top view (from Weakley, 1996) APPROACH This research is performed under the premise that burner geometry plays an important role in N O x production. The design of experiments (DoE) method is used to formulate a test matrix based on the factors and responses determined from the hypothesis. The test runs in the D o E matrix are performed at one operating condition with the following variations in burner geometric parameters: swirl block design, fuel injector configuration (which includes diameter and location of injection points), and flame holder design. A two-level, full-factorial D o E matrix of 16 experiments and 4 repeats (total of 20 experiments) was set up with the four parameters listed in Table 1. 3 |