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Firetube Operation Basics
1-8
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
FIGURE 1-10.
Temperature Gauge and Hot Water Controls
1.5.3 — Low Water Cutoff and ALWCO
1.
Low Water Cutoff
: Breaks the circuit to stop burner operation if the water level in the boiler drops below a safe
operating point, activating the low-water light and the optional alarm bell.
2.
Auxiliary Low Water Cutoff (optional)
: Breaks the circuit to stop burner operation if the water level in the
boiler drops below the master low-water cutoff point.
1.5.4 — Safety Valve(s)
Relieves the boiler of pressure higher than the design pressure or a lower pressure, if designated. Relief valves and
their discharge piping are to be installed to conform to ASME Code requirements.
1.6 — IFGR Components
1.
Flue Gas Transfer Port, IFGR Damper, Flange Collar
: The flue gas transfer port is a tube that allows the
flue gases to travel from the exit of the fourth-pass tubes to the entrance of the combustion air fan.
The IFGR damper controls the volume of flue gas induced into the combustion air stream. The damper is
located in the flue gas transfer port and is positioned by the control linkage.
2.
IFGR Damper Linkage
: The IFGR damper is positioned by the control linkage. The linkage could consist of
a single arm, or it could consist of several arms driven from the jackshaft to provide modulating control.
3.
Over-Travel Mechanism
: The over-travel mechanism has two functions:
•
Allows the linkage to pass through the front door.
•
Allows jackshaft rotation to exceed (over-travel) IFGR linkage movement.
A set of springs allows the linkage to stay in a fixed position while the jackshaft rotates.
4.
Fuel Changeover Linkage
: When a boiler is equipped to fire either gas or oil (dual-fuel boilers), and the
required NOx levels are below 60 ppm on natural gas, a dual linkage arrangement is used to provide the differ-
ent recirculation rates required for each fuel. Two jackshaft drive arms are provided, one for oil and one for gas.
The linkage is manually connected to the appropriate arm, based on the fuel being used.
Содержание 4WI
Страница 46: ...Burner Operation and Control 2 22 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Страница 62: ...Waterside Care and Requirements 3 16 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Страница 70: ...Sequence of Operation 4 8 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Страница 114: ...Adjustment Procedures 6 28 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Страница 192: ...Parts 9 38 750 211 revised 2009 Promethean Boilers Model 4WI Manual 9 2 27 General Control Panel 60 106 100 800 HP...
Страница 196: ...Parts 9 42 750 211 revised 2009 Promethean Boilers Model 4WI Manual 9 2 29 Main Gas Train 60 106 100 800 HP...