Inspection and Maintenance
8-18
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
8.13 — Inspection and Adjustment
NOx levels should be checked periodically to ensure compliance with all local and federal regulations, as well as to
ensure that the boiler is operating at maximum efficiency. Linkages should be inspected and free movement (no
binding) of the IFGR damper confirmed.
Increasing or decreasing NOx levels could indicate incorrect
damper positioning, loose linkages, an improper air-to-fuel ratio,
or stack draft changes. If adjustment is required, or if problems
persist, contact your local Cleaver-Brooks authorized representa-
tive for further assistance.
As ash and products of combustion pass through the IFGR
damper, there will be some accumulation on the damper, wind-
box, and other parts of the IFGR system and burner.
To ensure proper operation of the IFGR system and burner,
inspection and cleaning should be performed at regular intervals,
depending on the load, type of fuel, and combustion tempera-
tures.
FIGURE 8-22.
Induced Flue Gas Recirculation (IFGR) Air Flow
1.
With the IFGR damper exposed, inspect the internal linkages for secure connections, and check for free move-
ment of the linkage arms and the IFGR damper assembly. To check for free movement of the linkage, separate
the external linkage from the jackshaft drive arm(s) and cycle the exterior linkage through its range of move-
ment.
2.
The clearance between the impeller and backplate should be checked, and adjusted, if required. Impeller clear-
ances must correspond to the measurements in the table below:
3.
The impeller clearance is checked by inserting a long feeler gauge of the proper thickness between the impeller
and the impeller housing. Impeller clearances should be checked at the highest fin on the impeller (that fin
which is closest to the impeller housing), and must be checked at each point where the housing is attached to
the motor backplate.
4.
If the impeller clearance is not correct at all points, adjust:
A. Loosen the retaining nuts on both sides of the impeller housing.
Standard 60 PPM
30 PPM
25 PPM
20 PPM
.040 + .010
.050 + .010/ - .005
.060 + .005/ - .000
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...
