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Show "NOx Reduction by Low Pressure Steam Addition" c. Maintenance Program All maintenance work was conducted without impacting heater operation. Most of the work was reactivating the 1 50 # steam delivery system: a. The pressure regulator was replaced by a globe valve, b. Steam leaks repaired, c. Frozen steam gate valves on the oil gun manifold were replaced, d. The oil-steam mixer was removed from each gun, gun cleaned and installed in the burner at the vendor' specified position. Good house keeping maintenance was performed on the individual registers to minimize air bypassing the register openings. The portable analyzer was checked out and connections were re-activated on each cell roof and at the center of the convection section below the first rows of convection tubes: i.e., the arch. Calibrating gases were used to check for analyzer drift. No drifting occurred. D. Testing Testing was carried out in December. Ambient temperature averaged 70°F and about 50% relative humidity. During all phases of the testing, control of the heater remained at the computer console. Operations made best effort not to change the steam rates to the heater being tested by taking "swings" on the other superheater furnace. 1. Balancing Cell Oxygen readings were then taken from connections on the roof of each cell. A space bar was used to set all the air registers along a side wall to the same opening. Different openings were required on the four sides to obtain reasonably close oxygen readings. The adjustments were difficult due to oscillations in the oxygen readings. These adjustments were conducted two days before the testing and final adjustments were made during Test 1 - 3. Afterwards no further air register adjustments were made. Jordan Loftus ScD Page 4 |