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Show "NOx Reduction by Low Pressure Steam Addition" • A. Status and Strategy The objective was to bring the heater into NOx compliance with a reasonable offset for operating comf9rt. In order of priority the program was to • GET IT RIGHT THE FIRST TIME ! • DO IT QUICKLY ! • DO NOT IMPACT OPERATION • DO IT CHEAP! The plant specified that: 1. The "proposed" modifications should resolve the problem without requiring subsequent fixes, 2. The solution should be implemented in weeks not months, 3. Modifications could not await the next T & I, 4. The plant could not tolerate shutting down these essential furnaces, either in testing or installing and / or modifying the equipment; i.e., correction must be done "on the fly", 5. The .best "fix" is the one having minimum cost. The general consensus was that new low NOx burners were required. Steam addition to the existing burners was a viable alternative which fit all the above criteria. Since the steam delivery system was in place, a field test program would demonstrate the viability of this approach. Also low pressure 50 PSIG steam was in excess, therefore "current" cost to the plant would be negligible if this low pressure steam was applicable. The admissible NOx limit, TNRCC Regulation VII, is O. , 0 b NOx / MM Btu HHV. The test objective was to demonstrate NOx levels to less than 80% of the value. This would allow for probable variations in operating conditions between our field test and a later EPA sanctioned test and to provide operations with a comfort zone. Jordan Loftus ScD Page 2 |
