Combustion Catalog | Fives North American

Product Overview | 4384 Fuel Directed


4384 Fuel Directed Magna-Flame Burners are used with ambient temperature combustion air on a wide variety of furnaces operating up to 2000°F. Fuel directed principles enable these burners to vary flame configuration from approximately 750 000 Btu/h HHV per foot of length to 2 000 000 Btu/h HHV per foot. User can manually select optimum flame shape with the flame adjustment, which is an integral part of the gas connection. Refer to Bulletins 4472 and 4482 for Fuel Direct models operating with preheated combustion air and at higher furnace temperatures. Fuel Directed Burner bodies and backplates are fabricated of heavy gauge welded steel. Internal parts include a front refractory ring, alloy flame stabilizer, and an investment cast A330SST nozzle. Burners use gas pressure to create a flame shape and heat pattern that is most advantageous for the installation they are firing. A controlled flame shape is desirable in almost any application - it is essential in many to realize optimum furnace performance.

Burners are designed for a nominal 6"w.c. air pressure, but can be operated to a maximum 10"w.c. This is particularly useful for installation with high excess air, preheated air or FGR. Stoichiometric firing at this nominal capacity will result in a fuel pressure requirement of 8 psig at the burner. Operation is quiet and the burner is stable over a wide range of air/gas ratios ranging from 30% fuel rich to 1000% excess air at 6"w.c. Stoichiometric turndown is 10:1 with 6"w.c. main air pressure. For multiple burner installations requiring high turndown capability, air inlet orifices should be considered to ensure adequate header pressure for uniform air distribution at low inputs. Standard design is for 8 psig gas pressure at the burner; however a 2 psig option is available in sizes up to -20 if gas pressure is limited. Be sure to specify the LO option when ordering the 2 psig model.

A constant gas jet at 8 psi and 5% of maximum capacity main- tains flame definition as input is reduced.

A low fire start is required at 1"w.c or less main air pressure.

Burner Body

Main Air

Alloy Flame Stabilizer

 Radial gas--Increasing radial gas flow (with flame adjustment screw S) shortens fl ame.  Forward gas--Increasing forward gas flow (with flame adjustment screw L) lengthens fl ame.  Jet gas--used to maintain flame definition as input is reduced.

Refractory Ring

i nvestment cast A330SST Nozzle

Bulletin 4384 Page 2

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