CONSTRUCTION
Burner bodies and backplates are cast iron with Inconel air tubes. An insulating refractory “cookie” covers the face of burner stabilizer to protect it from flame and furnace radiation. The burner tile is formed into the main body using 3000 °F insulating castable refractory. The atomizing air and oil nozzles are made from stainless steel.
A 4021-12 pilot is used to light 6435 burners. 4021-12 pilot tips are available separately or in the 4011-12 pilot set. The 4011-12 pilot set includes a 4021-12 pilot tip, 4031 pilot mixer, 1122-0 air valve, and 1821B-02 gas valve. The 4021-12 pilot has a 10 mm threaded connection for an included spark plug. Direction arrows on the tip body show the proper premix flow direction.
FURNACE MOUNTING
See Bulletin 4011/4021 for additional information.
When the furnace wall is thicker than 2X of tile length, the tunnel beyond that should be flared at a 30° or greater included angle, starting at the OD of the tile. (See Supplement DF-M1 for addi- tional tile installation recommendations.
4021-12 " Threaded both ends
Tile length "L"
Do not exceed "L"
The pilot is mounted on the right or le side of the burner. When the burner is ordered, choose which side of the burner the pilot is to be mounted on. When the burner tile is made only one pilot tunnel is formed into the tile, the alternate location on the -1 thru -4 sizes will have a small hole through the refractory to provide a tile pressure location. Direct spark ignition on oil is not considered a viable lighting method due to the lack of repeatability. If the burner is only going to be operated with gas, an air-cooled igniter can be used but the lighting window will not be as good as a pilot tip can provide. When using flame supervision, an interrupted pilot is required, do not use constant or intermittent pilots. If using direct spark ignition in gas only applications, turn off spark aer the burner lights. Because of backpressure in the tile, torch lighting is not recommended. 6435 burners require ultraviolet (UV) detectors for monitoring pilot or main flame. For the -4 and smaller sizes, the detector should be mounted on the backplate on the same side of the burner as the pilot tip is mounted. On the -5 and -6 sizes a UV mounting location is provided on the side of the burner body next to the pilot tunnel. See the dimension page for details on the UV mounting location.
30°
If larger size high velocity dual fuel burners is required, consider the 6575 HiRAM burners with sizes from 4 to 15 Mbtu/h HHV (1050 to 3950 kW LHV). For even larger sizes consider the 6821-R Magna-Flame™ burner.
Flame rods are not a reliable option for flame supervision on 6435 burners, regardless of the fuel being used
Bulletin 6435 Page 3
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