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Show swirl) and Directional Flame burner (axial flow). Both of these burners are commercially available low-NO burners. EXPERIMENTAL SET UP The combustion tests were all performed in Riley Stoker's Coal Burner Test Facility (CBTF) at 100 million Btu/hr. The CBTF, shown in Figure 1, is a horizontally-fired tunnel. The inside surface of the test furnace is partially covered with insulating refractory to simulate radiant flame temperatures experienced in operating furnaces. The furnace is equipped with outboard tertiary air ports on the burner front, and downstream staging ports along the side wall to simulate overfire air. There are sufficient access points along the furnace side walls for wide angle viewing, video-recording, temperature probing, gas sampling, and other data collection. Exhaust Duct Down Stream Air Stagina Ports 60 £**-} Test Burner )<> Windbox Figure 1. The Coal Burner Test Facility (CBTF) The fuel for all three burner tests was a West Virginia Lower Kittanning coal from Ashland Coal's Hobet #7 mine. This is a low sulfur, high volatile bituminous coal. A typical analysis for the test coal is shown in Table 1. 3 |