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Show emissions in comparison to the DRB-XCL ®. However, these NOx emissions reductions were at the expense of CO and unburned carbon. Further optimization is required through experimental testing and numerical modeling. Although minor modifications are in order for the advanced 10w-NOx burner, the general hardware configuration is promising and therefore, the burner was given the name ofDRB-4ZTM. This name provides a continuity with the low NOx DRB product line from which it originated, while still accommodating its uniqueness. The preliminary results from the initial round of Subsystem Testing are shown in Table 4. As previously mentioned, the results show promise, but further modifications are required. Initial cases have been set up for numerical modeling investigation. The results of these cases will be used for alterations on the DRB-4ZTM burner for testing in January 1996. PRELIMINARY POC DEMONSTRATION FACILITY DESIGN 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 III. The POC facility builds on the modifications made to B&W's CEDF in Phase II 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, TABLE 4 INfTIAL SUBSYSTEM TESTING - PRELIMINARY RESULTS DRB-4ZTM in Comparison to DRB-XCL ® Baseline Dlinois #6 Coal Mahoning #7 A Coal NOx emissions 15 - 20% reduction 45 - 50% reduction CO emissions Slightly increased Significantly increased Flyash LO! No difference Significant increase 19 |
