Product Overview | Flat Flame ™ Burner
OPERATING CHARACTERISTICS 4832 Burners are sealed-in, nozzle mixing burners which can not flash back. Burner turndown will be affected by accuracy of control system, flame supervision device selected, and air/ fuel ratio settings. Effective turndown can be extended by use of higher excess air settings. Burners are normally selected for 12 osi or more air pressure at high fire to allow adequate turndown while still maintaining good flame spin characteristics. Gas pressure requirements are listed in Table 3. For fuel gas other than natural gas, specify gas composition. Internal construction and gas pressure requirements may vary, especially for coke oven gas. Flame diameters are indicated in Instructions Sheet 4832-2. Flame depth (forward travel) is less than 6 inches for any size when operated within normal excess air ratings shown in Table 2. In tight, cold furnaces, 4832 Burners are not stable on stoichiometric air/gas ratio. Alternatives during start-ups until furnace reaches approximately 1400°F:
INTRODUCTION N orth American 4832 Flat Flame Burners convert the refractory expanse of a furnace wall or roof into a uniform heat radiating surface that is capable of high rates of heat transfer over wide areas. These burners produce disc-shaped, tangential flames that scrub adjacent refractory and have little forward velocity. The flat flame characteristics of these burners limit the possibility of hot spots caused by flame impingement on work as close as 12 inches away. The 4832 Burners are used where excess air is required for uniformity and/ or thermal turndown. CONSTRUCTION 4832 Burners have cast iron bodies and heat resistant cast iron mountings. All internals exposed to radiant heat from furnace are stainless steel. Tile material options include both 3000°F and 3200°F castable refractories. Tiles are available in either 9 or 13 inch lengths. The tiles are supported by alloy anchors attached to the mounting plate. Four hanger rods are furnished with every 4832 Roof Section Burner. Construction and Installation Notes: The 4832 burners' flame spin creates backpressure within the burner mounting, so any unused holes must be plugged prior to lightoff. All 4832 burners are shipped with a ¾ " observation port installed as shown in the above photograph. The ignition and supervisory ports are plugged at the factory to protect the threads and keep burner internals clean prior to start- up. Flexible air and gas connections (Bulletin 8770) are recommended to compensate for expansion of furnaces and piping .
1. Keep furnace doors open or otherwise provide free air in chamber, or
2. Operate 4832 Burner(s) on lean air/gas ratio, i.e., with excess air through the burner, or
3. Use the 4833 Flat Flame Burner, which has narrower air/gas ratio limits (it is available in the -3, -4, -5, and -6 sizes).
4. Consult North American for special cold, tight versions.
A new-style, three-hole mounting provides for visual observation of pilot and/or main flame, burner ignition, and flame supervision. Preheated Combustion Air: All standard 4832 burners are capable of operating with preheated combustion air up to 750°F. For burners designed specifically for preheated air (up to 1200°F) consult North American.
Wall Mounting (flangeless)
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