Chapter 1 — Basics of Firetube Operation
1-10 Part No. 750-184
6. Burner Drawer . The gas spudding pattern for the IFGR system
may be different than that of a non-IFGR CB Burner of the same
horsepower (HP) model designation.
7. Combustion Air Inlet. The combustion air inlets are located at the
top of the front door. Air enters from the rear of the air inlet
shrouds, which reduces the sound level and captures heat from
the boiler and stack flue outlet.
8. Front Door Insulation. If NO
x
emissions are below 60 PPM, the
front door is insulated inside to control temperature build up. The
insulation is held in place with wire mesh.
Figure 1-6
Induced Flue Gas Recirculation System, General Arrangement
COMBUSTION AIR INLET
FRONT DOOR
CASSETTE MOUNTING BOLTS
AIRBOX GASKET
CASSETTE LIFTING EYES
FAN/MOTOR CASSETTE
FLANGE COLLAR
COMBUSTION AIR FAN
OVER-TRAVEL MECHANISM
IFGR DAMPER LINKAGE
QUICK DISCONNECT LINKAGE
JACKSHAFT ARM
BURNER DRAWER
BURNER DRAWER SUPPORTS
INNER PLATE CLAMPS
FRONT DOOR BOLTS
FLUE OUTLET
AIRBOX
FLUE GAS TRANSFER
PORT WITH IFGR DAMPER
FOURTH-PASS TUBES
DAMPER DRIVE ARM
THROAT AND LINER TILE
FURNACE
GAS SPUDS
BURNER HOUSING
FLUE GAS FLOW
COMBUSTION AIR FLOW
BACKPLATE GASKET
WINDBOX
INSULATED PARTITION
REAR BURNER DRAWER GASKET
INSULATION
(20-30 PPM NOx SYSTEMS)
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