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Show be used to provide a final evaluation of burner performance at both the proof-of-concept scale (12.5 MBtuIhr), to be tested in Phase N, and the commercial generating unit scale (150 MBtulhr). Phase N of the Combustion 2000 program is a Proof-of-Concept Demonstration. In order to satisfy the intent of Proof-of-Concept (POC) testing in a cost-effective manner, B&W has elected to further modify the 100 MBtulhr CEDF to create the POC Demonstration Facility for Phase IV. A preliminary POC design has been reported to the DOE as part of Phase II. The results of development and testing efforts in Phase II will be incorporated into the POC final design in Phase ill. The POC facility builds on the modifications made to B&W's CEDF in Phase IT for Subsystem testing. The majority of the modifications to the CEDF will be associated with the NOx and Controls and Sensors subsystems. The major modifications will include "hardening" of the systems to permit extended periods of operation, incorporation of advanced controls and sensors, installation of multiple opposed wall-fired DRB-4ZTM burners and an overfire air system, and the incorporation of two feeders to simulate mUltiple pulverizers. The POC Demonstration will employ eight burners of 12.5 MBtulhr capacity. Since the burner scale-up issues will be addressed in Phase II, the integration of the burners, the ability to control their individual operation, and optimization of a complete overfire air system must be demonstrated in Phase IV. Previous work in Phase II employing the 5 MBtulhr and 100 MBtulhr burners as well as modeling of the POC facility will provide the performance characteristic link between the POC and the CGU. CONCLUSIONS With pilot-scale testing and subsystem testing near completion, and the design of the POC Demonstration Facility in progress, B&W's view of what it will take to provide a commercial generating unit which will meet the LEBS program goals is coming into clearer focus. A combination of further study and the results of pilot and subsystem scale testing is narrowing the alternatives and improving the system designs initiated in the preliminary Phase I work. With the completion of experimental testing and numerical modeling, B& W expects to further confirm and refine the LEBS design and costs in preparation for Proof-of-Concept Demonstration in Phase IV. Upon completion of the LEBS program, B&W anticipates having a commercial product capable of successfully competing with the other emerging advanced coal-fired technologies in both performance and cost. ACKNOWLEDGMENTS The authors wish to express thanks to the U.S. Department of Energy's Pittsburgh Energy Technology Center for supporting the B& W LEBS Team's efforts. REFERENCES 1. Mc~oy Power Reports, Boilers Worldwide, April 1995. 2. McDonald, D.K., et. aI., "B&W's Advanced Coal-Fired Low Emission Boiler System: Preparation for and Preliminary Results of Subsystem Testing," presented at the 21st Page· 16 |