Basics
1-2
750-368
CBEX Elite 100-1200 HP
The low emission option for the CBEX Elite line of Firetube Boilers reduces Nitrogen
Oxide (NOx) emissions, a major contributor to ozone pollution (smog). Carbon Monoxide
(CO) emissions also tend to be lower as increased turbulence caused by the addition of
the flue gases into the combustion air stream results in improved combustion.
The CBEX Elite Firetube Boiler line is designed to incorporate Induced Flue Gas Recircu-
lation (IFGR) when firing either natural gas and/or light oil, and is compatible with both
hot water and steam systems.
The IFGR system mixes a portion of the relatively cool flue gas from the exit of the sec-
ond-pass tubes with the incoming combustion air to reduce the furnace flame tempera-
ture, thereby reducing NOx emissions. In this approach, the combustion air fan handles
both the combustion air and the recirculated flue gases.
FIGURE 1-1. Induced Flue Gas Recirculation (IFGR)
The low emission design can affect the selection of the combustion air fan, motor, burner, and other components.
Several different system configurations are available, depending on the requirements for NOx emissions and the
fuels used. All systems use similar primary components, but may have different IFGR damper fan and motor
sizes.
The boiler and related equipment installation should conform to state and local codes governing such equipment.
Prior to installation, the proper authorities having jurisdiction are to be consulted, permits obtained, etc.
All CBEX Elite boilers in the series comply, when equipped with optional equipment, to Industrial Risk Insurers
(IRI), Factory Mutual (FM), or other insuring underwriters requirements.
1.2 — The Boiler
The CBEX Elite boiler is a packaged firetube boiler of welded steel construction and consists of a pressure vessel,
burner, burner controls, forced draft fan, damper, air pump, refractory, and appropriate boiler trim.
The horsepower rating of the boiler is indicated by the numbers following the fuel series. For example, CBEX
700-600 indicates a gas-fired 600 hp boiler.
The firetube construction provides some characteristics that differentiate it from other boiler types. Because of its
vessel size, the firetube boiler contains a large amount of water, allowing it to respond to load changes with min-
imum variation in steam pressure.
Firetube boilers are rated in boiler horsepower (BHP), which should not be confused with other horsepower mea-
surements.
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