OCR Text |
Show The baghouse removes ash and sorbent particles from the exhaust gas, and provides additional contacting time for removal of S~ from the flue gas by the sorbent. The bags are periodically pulsed with air, causing the particles to fall into a hopper ~elow the bags. INITIAL EMISSION CONTROL SYSTEM TEST RESULTS The ECS was successfully started up and has been tested at full flow with the engine operating on diesel fuel. Work thus far has focused on performance testing of the SCR and sorbent injection systems, operational testing of the mechanical components (ID fan, dampers, and rotary air locks), performance testing of the heat exchanger, and evaluation of the system controls and safety interlocks. SCR Performance With the engine operating on diesel fuel, engine exhaust NOx levels were 1200 to 1300 pm at 10.5% oxygen, about twice the level expected from CWS fuel. Based on prior single cylinder engine tests, the SCR inlet temperature is expected to be about 850°F, with limits of 800° to 900°F. At these conditions, the SCR system was expected to reduce NOx by 80% at NH3/NOx ratios of 0.85 to 0.95. During the initial test series, the SCR reactor was only able to achieve 60 to 80% NOx reduction at 800° to 870°F as shown in Figure 2. 100 --~0 9800 c 70 0 ;:: (.) 60 ~ "C Q) 50 a: cS 40 z 30 20 10 00 0.2 0.4 1.0 ••• ---June 7,1991 ..... June 6,1991 ....... August 8, 1991 1.2 1.4 Figure 2. Initial SCR Performance Results 5 1.6 8-885Oa |