North American TwinBed ® II Tile and Mounting Suggestions
Sheet 4343-2
REFRACTORY TILE CONSTRUCTION
In LNI firing mode, TwinBed II’s refractory tile acts as a passage for preheated air to the furnace and as an exhaust port. In this mode it is not subject to the thermal stress of a conventional burner tile. When nozzle-mix firing however, TwinBed II is a high temperature, preheated- air, high velocity burner, with relatively high tile pressures. Careful refractory design and construction are required for optimum life. It is important that combustion gases are retained within the tile tunnel. Proper tile installation requires anchoring of the cast/rammed tile struc- ture to the shell of the furnace. Thermal expansion of the structure and material shrinkage of the monolithic refractory during initial firing can create passages for hot gases between steel shell and refractory wall.
North American’s suggested construction addresses these issues. Twin- Bed II’s mounting plate has a continuously welded steel ring around the port to form a barrier to hot gas migration. The mounting plate is large enough for attachment of customer supplied refractory anchors. Included with purchase of a TB-II system are furnace specific burner mounting drawings. The drawings contain information on tile construction: main tile port dimensions, lance placement and mounting angle. Mandrels may be built by the tile installer to the dimensional information or may be purchased from Fives North American Combustion, Inc. Important points about tile construction on page 2.
customer to pack ceramic fiber around injector
Make sure rope gasket supplied with mounting plate is in channel before mounting burner.
rigid tile mounting box (by customer)
mounting plate is supplied with 3⁄16 " 4" circular steel ring
injector port
typical reinforcement (by customer)
recommended support (by customer)
Do not use these holes to support TB-II
Fives North American TwinBed II Heat Reclamation
furnace buckstays
furnace shell
alternate support (column), must provide for thermal expansion (by customer)
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