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Show CONCLUSIONS Performance of a single commercial-scale, 100 MBtulhr, unstaged DRB-XCL ® LowNOx PC burner and a proprietary coal nozzle impeller device was characterized in a state-ofthe- art combustion test facility. Effects of burner hardware configuration, coal rank, coal fineness, excess air, and thennalload on NOx, CO, UBCL, and flame length were investigated. Regardless of the coal type, installation of the new impeller in the coal nozzle reduced the UBCL and flame length without changing the NOx emissions appreciably. The new device is now being considered for installation in commercial units. ACKNOWLEDGEMENTS We are very thankful for the exemplary teamwork of many people from various divisions of B&W who contributed to the successful accomplishment of the program goals. REFERENCES 1. Sarv, H., Pilot-scale XCL PC Burner Evaluation of Impeller/Swirler Devices in the SBS Facility, Babcock & Wilcox Internal Report, June 1994. 2. Sarv, H., Pilot-scale XCL PC Burner Evaluation of Impeller/Swider Devices in the SBS Facility - 2nd Test Campaign, Babcock & Wilcox Internal Report, September 1994. 3. Flynn, T.J., LaRue, A.D., and Nolan, P.S., Introduction to Babcock and Wilcox's 100 MBtulhr Clean Environment Development Facility, Presented at the Annual Meeting of the American Power Conference, Chicago, IL, April 1994. 4. LaRue, A.D., NOx Reduction by Combustion in PC-Fired Boilers, Presented at the Joint ASMEJIEEE Power Generation Conference, Boston, MA, October 1990. 5. Patent Pending. 15 |