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Show "NOx Reduction by Low Pressure Steam Addition" B. Superheater Furnace The heater designed in the late '75 section, 10 fan, and stack (Figure 1). consists of twin radiant cell, single convection Steam is superheated to 900°F in radiant tube adjacent to the side wall tubes, 30 tubes per side. The lowest radiant tube is about 6 foot 1 inch above the floor. The heater is side wall fired with 1 6 burners on a side. The flue gas residence time in the radiant cells is about 20 seconds. A portion of the steam is generated in the convection section. There is also an economizer section. The heater release based on the entire radiant cells volume is 3,600 Btu / CF. The burners are centered about l' 1" above the inside floor and fire against a 4 foot high target wall located about 4 feet 4 inches in front of the burner. If one defines an arbitrary bum volume as the space in front of the burners and up to top of the target wall, its heat release is 33,050 Btu / CF (Figure 3). 1 . Burners They are John Zink Flat Flame Natural Draft Combination Oil-Gas (JZ NO FFC -Q-60 Comb. - Figure 2). There are 4 gas canes on a 9" wide and 12.25" high grid and their tips are recessed about 6" inches from the front end of the burner tile. A steam-oil tip, with 6 - O. , 04" holes on a 50° spread, is centered about 3/4" in the front of the inner rectangular muffle, at the cold end. The air register has 5 rectangular openings 2.5" wide by 1 2" high. A sliding plate having equal openings slide behind the front plate to adjust the effective opening for air passage, Figure 3. Air flows into plenum and then into the burner dividing itself between the inside and outside of the oil cone tile. Jordan Loftus ScD Page 3 |
