Cleaver-Brooks C1X Series, Operation Manual

Standard Economizers

1-12

Part No. 750-266

amount of nozzles depending on the economizer size.  The ring nozzle assembly is attached to a 
manifold and powered up and down (vertical installation) or side to side (horizontal installation) by a 
Pneumatic Drive Cylinder.  

During the sootblowing operation, the internal damper automatically is adjusted to the full bypass 
position and steam or air is also automatically controlled to enter the economizer.  The flue gas then 
changes from the normal gas flow to bypass gas flow direction, enabling a unique ‘cross flow clean-
ing’ to take place.  This type of cleaning occurs because the ring nozzle assembly encompasses the 
heat transfer surfaces and blows transverse to the fin tube row while the flue gases blow longitu-dinal 
to the row.  Operating the combustion source at maximum output conditions, during blowdown cycle 
increases the velocityover the fin tubing, however it is not mandatory.  The sootblowing sequence can 
operate at any load condition.  The complete cleaning occurs as a result of an effective sootblower 
design having to penetrate only a maximum of three coils or rows.  

The Pneumatic Drive Cylinder is mounted on the exterior of the economizer and is powered by 
100PSI control air and actuated by a 120 volt solenoid for on/off air control.  The Duration Timer 
adjusts the sequence of the sootblower intervalsranging from 6 - 24 hours and sootblower duration 
on time ranging from 6 - 42 seconds.  The Pneumatic Drive Cylindermoves the ring nozzle assembly 
up when energized and down when de-energized (for vertical gas flow economizer installations).  The 
speed rate of upward and downward travel are also individually adjustable, to allow closer control of 
thesootblowing cycle as required.  A manual push button start located at the Pneumatic Drive Cylin-
der’s solenoid allows for amanual override and is used to check test runs for speed at which the 
Pneumatic Drive Cylinder extends and retracts. 

Mounted at the internal exhaust bypass damper shaft is a 120 volt Electric Damper Control (modu-
lating for Stack Corrosion Control) for flue gas bypass control flow.  When energized, the damper is 
moved to the closed position for normal economizer operation.  When de-energized as the sootblow-
ing cycle begins, the damper returns to the open or by-pass operation.  

The Electric Control Valve allows 50 to 120 PSI air or steam (usually steam due to cost and greater 
effectiveness) to thering nozzle assembly when energized.  As soon as it opens the cleaning action 
immediately begins, and stops the flow ofsteam or air when de-energized at the end of the cycle.

SOOTBLOWING OPERATING SEQUENCE

1.  Upon the start of the blowdown cycle, the Pneumatic Drive Cylinder is activated and begins to move by 

an adjustable Duration Timer.

2.  Upon moving, both the Damper Control, and Control Valve are also activated.
3.  Control Valve opens and allows steam to begin the cleaning action.
4.  Damper control opens and bypasses flue gas through the center.
5.  Pneumatic Drive Cylinder begins to move the ring nozzle assembly as the cleaning action takes place.
6.  When the Pneumatic Drive Cylinder reaches its full stroke, its solenoid is de-energized by the Duration 

Timer and begins to retract to the original position.

Important

!

Sootblowing intervals are dependent on periodic inspections of the 
finned tubing and the efficiency of the combustion source. When used 
in conjunction with the Stack Corrosion Control, the blowdown cycle 
time interrupts the control signal for 30-45 seconds and upon 
completion, the Stack Corrosion Control returns to its normal operation.