Combustion Catalog | Fives North American

Features | Quick Clean Burner

MULTIPLE HEARTH FURNACES The 4419 Series Quick Clean burner was designed specifi- cally to meet the requirements of multiple hearth furnaces. The Quick Clean burner enhances the circulation of furnace gases and eliminates or reduces many common problems found in sludge burning incinerators and carbon regeneration furnaces. It is well suited for modernization projects and new multiple hearth furnace installations. ALUMINUM TOWER MELTER The 4419 Series Quick Clean burner is ideal for the aluminum tower melter applications where material from the chamber can find its way into the burner tile. The ability to gain access into the burner tile without disconnecting the air and gas piping shortens the maintenance time required to get the furnace back into production. The medium velocity flame enhances heat transfer to the aluminum charge. The burner is designed for new or retrofit applications on melting furnaces. RECESSED CONSTRUCTION The burner body is recessed into the wall so that the flame initiation is 8" from the inside of the furnace chamber instead of the usual 18-24" typical for tangential firing. As a result, the furnace outer shell and the back of the burner operate at lower temperatures, reducing shell overheating problems and stress on UV flame detectors, ignition transformers and cables. Because a mounting flange can be welded anywhere on the extension tube, the burner can be adapted to various wall constructions. The tile itself is formed in the field by the installer with a mandrel and becomes an integral part of the refractory wall. Various mounting flanges are available as options to fit individual applications. MINIMIZED PLUGGING PROBLEMS To minimize plugging problems, the burner refractory tile is tapered to a small discharge port which provides a medium velocity flame. There is no shelf or wide opening as with a conventional tile exit. The discharge velocity of the burner, combined with the small opening into the furnace, discourages the build up of material in front of or within the burner tile. SUPERIOR STIRRING ACTION The reduced port tile increases the velocity of the products of combustion exiting the tile. This causes a significant increase in turbulence and encourages entrainment of more furnace gases into the flame envelope. The mixing on the hearth increases while tempering the flame, which results in more uniform heat release without hot spots.

QUICK CLEANOUT and INSPECTION If cleanout of the burner tile is required, the burner body design allows for quick and easy access to the burner internals. Disconnect the ignition cable and UV flame detector, and loosen the eight hex-head bolts that hold the backplate in place. Rotate the backplate a few degrees with the built-in handles and the burner internals can be pulled out, leaving a clear passage to the burner tunnel for easy maintenance and cleaning. The main air and gas piping connections do not need to be disconnected to gain access to the burner tunnel. On the dual fuel version of the burner, the small oil and atomizing air lines must also be removed, so quick connect fittings are recommended. DIRECT SPARK IGNITION The 4419 series incorporates direct spark ignition, eliminating the need for gas pilots, mixers and other premix pilot support parts. Maintenance of the burner is also reduced with fewer components to adjust and maintain. The igniter and igniter ground leg are easily replaced without special tools. It’s always a good idea to stock a few spare igniters and ground legs. The spark gap should be set to approximately .09 inch. LIGHTING ARRANGEMENTS The burner air should be turned to low fire, and the spark turned on, before opening the burner gas valve. After the burner is lit, the spark must be turned off for proper burner operation. During the ignition period, a continuous 6000 volt (minimum) spark is required. Spark distributor systems cannot be used with the 4419 Series Burners. When burning #2 fuel oil, the burner should be lit with a small amount of gas first, which is turned off after the oil lights. FLAME SUPERVISION The North American 4419 series has an internally purged flame detector tube that runs from the backplate to the stabilizer. The sight line of the tube is angled to minimize the sensing of flame outside the tile by the UV flame detector. It is recommended that the UV connection be located at the 12 o'clock position for most installations. To optimize the flame signal during low fire oil applications, it may be necessary to have the UV tube sight line point to the "short side" of the angled wall as shown in Figure 1. The connection on the 4419 Series UV flame dectector is a ½" MPT fitting. Refer to Bulletin 8832 for choices of UV flame detectors and adapters.

Bulletin 4419 Page 2

Made with FlippingBook flipbook maker