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Show "NOx Reduction by Low Pressure Steam Addition" 2. Operations During Testing The test team controlled only the steam gun pressure and the air register openings position. Changes did not impact on the amount and quality of the superheated steam. The control room operator manually maintained constant 10 fan speed. The superheated steam process outlet temperature was under temperature control which resets the fuel gas rate. A process upset precluded taking test data between 11 :00 AM to 1 :00 PM. Operating data logged on 1 minute intervals were filtered to include only the testing periods: TESTS 1-3 rrESTS 1-3 TESTS 4-10 TESTS 4-10 UNITS AVERAGE STD DEV AVERAGE STO OEV 10 FAN SPEED RPM 400.18 1.35 400.06 1.31 SPHTD STEAM DEG. FAHR. 940.06 0.81 939.86 0.66 FUEL GAS RATE LB/HR 7,083 150 6,837 144 ARCH RIGHT DEG FAHR 1467.3 3.5 1443.8 5.3 ~RCH LEFT DEG FAHR 1463.8 3.5 1430.2 8.1 Figure 4, the Fuel Gas Rate on 1 Minute Intervals is typical of an 10 fan limitations on operations. Data were collected after lining out at roughly one minute intervals. The multiple data points for a given test were averaged to smooth out the oscillations. Except for an occasional 10 Fan RPM spike the results indicate that the heater operation was relatively constant within the testing period. For two standard deviations, the superheated steam average temperature was at the target of 940 +/- 1.60 F for Tests 1-3; 940 +/- 1.30 F for Tests 4-10. The gas rate for Tests 1-3 was 7,083 Lb/Hr +/-4.2%; Tests 4-10, 6,837 +/- 4.2%. The differences in the average flue gas temperatures just above the arch at the 1/3 distances from end to end wall were 3.5 and 1 3.6 degrees Fahrenheit. No attempt was made to equalize the two arch temperature readings by biasing the air register openings on a given side. Jordan Loftus ScD Page 5 |