Supplement DF-M1 Page 2
H
Waterproofing (all around) to prevent surrounding refractory from absorbing water from castable refractory. Plastic sheet is suggested. Shelf support angle. This and expansion joint K prevent vertical pressure from being exerted on burner tile. This construction is especially helpful when burners are located high in a wall.
Recommended method for installing burner tile in a hard refractory lined furnace.
buckstay
furnace shell plate
J
K H
A
B
C
F 1
E D
9 in. min.
G
Expansion joint, densely packed with refractory wool.
K
burner tile
burner mounting plate
see Figure 1 re tile length
PROCEDURE
F 2
burner tile
1. Cut an opening in furnace shell allowing ½" (¾" for larger burners) clearance all around tile or lip on mounting plate.
H K
C
G
2. Weld studs or bolts to the shell to match holes in burner mounting plate.
J
B
A
3. Weld angle irons all around burner opening on inside of shell.
Figure 2. Cross section through a vertical furnace wall showing a recommended method for installing a burner tile. Letters refer to legend below.
4. Attach anchor tiles to angle irons.
5. Bolt burner to the wall.
Legend for Figure 2 Insulating refractory or block insulation.
6. Lay up refractory wall allowing for thermal expansion as recommended by refractory supplier--refractory wall must exert no stress on burner or surrounding matrix when furnace is hot or when cold, but there should be no openings in refractory through which furnace gases could reach the shell. 7. Leave an opening all around the burner tile for a rammed or cast refractory matrix as shown in Figure 2. Purpose of this matrix is to make sure burner mounting and tile, matrix, and furnace shell will all move as a unit in the event of unequal expansion of refractory wall and shell. This construction is designed to eliminate failures shown in Figures 3 and 4 (see page 3). 8. Ram or cast a matrix†of high temperature low shrinkage refractory in space between burner tile and refractory wall to obtain tight contact with tile, brickwork, shell, angle iron, and anchors. Ramming or pouring should be completed quickly to minimize layering.
A
High temperature refractory. All refractory must be tied securely to furnace shell plate. Horizontal and vertical expansion joints must be provided in surrounding refractory to prevent pressure from being exerted on burner tile. Horizontal angles welded to furnace shell plate, extending from buckstay to buckstay. Vertical angles should also be welded to furnace shell plate on either side of the burner.
B
C
Burner mounting bolts with heads welded in place.
D
Gasket--may be used to provide better seal between burner mounting plate and furnace shell plate.
E
F
Anchor tiles tied back to angle (preferred to F 2 ), or
Stainless steel bent-rod anchors, mastic-coated.
F 1
Castable refractory matrix all around--minimum thickness = 9" or ½ the tile OD, whichever is greater. Rammed refractory is an alternative, but anchors then must be refractory type. (Castable is preferred because its entire mass sets up without firing.)
G 2
9. After all refractory has hardened, connect piping to burner using flexible connections (e.g., Bulletin 8770).
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
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