The North American HiRAM® Burners have exceptional performance
LIGHTING AND FLAME SUPERVISON
INSTALLATION AND OPERATION
HiRAMs are particularly applicable to aluminum melters, ladle heaters, soaking pits, rotary kilns, heat treat furnaces, thermal oxidizers, and dryers: Any installation where high velocity entrainment, penetration, and recirculation can benefit temperature uniformity and thermal efficiency. Like the gas only 4575 HiRAM, the 6575 HiRAM Burner’s true high velocity results from exceptionally high Btu/h HHV input rates relative to its reduced tile discharge area. Velocities ranging from 500 to 750 feet per second (100 to 230 m/s) drive heat into a furnace load, creating tremendous momentum while entraining and recirculating 7-10 cubic feet of furnace gases for every cubic foot of burner product. HiRAMs are suitable for furnace temperatures up to 2400 °F (1315 °C). They can be used with preheated air up to 600 °F (315 °C). The reduced tile discharge opening also protects burner internals from radiant heat and from melting furnace splash. Standard burners include 3000 °F (1650 °C) dense castable tiles. Burner tile installation should be made in accord with instructions on Supplement DF-M1 for hard refractory lined furnaces or DF- M2 for fiber lined furnaces. It is generally not necessary to use a metal jacketed tile in fiber lined furnaces with 6575 burners. The HiRAM burners can be used with a variety of control systems including pressure-balanced or electronic fuel/air ratio systems. The gas pressure requirement is approximately 0.7 that of the combustion air when firing on stoichiometric ratio. System pressure drops should be checked to make sure that adequate gas pressure will be available at the burner. In order to avoid any potential combustion driven oscillations which can produce excessive noise or vibration, it is imperative that a limiting orifice valve (North American model 1807) be installed within 5 pipe diameters (5D) of the gas connection. HiRAM® burners are not designed for fuel rich operation. Prolonged fuel rich operation may damage the burner.
A gas pilot is required for operation with oil. Direct spark ignition is satisfactory for gas only operation. Avoid configuring the ignition/flame supervision ports on the bottom quadrant of the burner. Torch lighting is not recommended because of high tile pressures. See Bulletin 4011/4021 for detailed information on the pilot tips required for 6575 ignition. 6575 burners require UV flame supervision. Flame rods are only appropriate for gas operation. See Sheet 4000-2 and 8800-1 for UV flame supervision information.
SPECIAL ENGINEERED OPTIONS
To compliment the “classic” high velocity refractory tile, the HiRAM burner family is available with many special engineered tile options. See the 4575 bulletin for details. The classic swing bolt backplate version of the HiRAM is available as an engineered special. This design can be useful in applications where the backplate needs to be removed often. For applications where direct access into the tile is desired, the HiRAM can be supplied with a hinged mechanism. Contact North American for further information. The 6575 HiRAM Burner is designed for clean fuel gases or light oil. Consult North American regarding other fuels. A gas only version is described in Bulletin 4575. HiRAMs are an extension upward of North American Tempest® product line of high velocity burners. For capacities less than a HiRAM consider 6435, 4441 or 4445 Tempest Burners. For sizes larger than the HiRAM see the 4821-R and 6821-R burners.
Bulletin 6575 Page 2
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