Cleaver-Brooks C1X Series, Operation Manual

Standard Economizers

Part No. 750-266

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1.7.2 - Stack Corrosion Control

Stack Corrosion Control holds the stack temperature down in order to prevent condensation and
corrosion. The damper will automatically modulate to maintain a predetermined temperature.

ELECTRICAL COMPONENTS

1. INDICATING CONTROL PANEL (combining Automatic Sootblower and Stack Corrosion Control) 

including:

•  Terminal Strip providing customer 120V power connection and a thermocouple connection.

•  “Power on/off” switch and “Indicating light” opens the circuit to operate the Stack Corrosion Control 

Assemblyincluding the indicating controller modulating damper actuator, and thermocouple.

•  “Sootblower on/off” switch opens the circuit to operate the Timed Automatic Sootblower Assembly 

including the Electric Steam Valve Assembly, Pneumatic Drive Cylinder Assembly.

•  Duration Timercontrols the length of time between sootblowing cycles (off/interval) and the length of time 

at the Pneumatic Drive Cylinder Assy. (on/duration).  A control knob for each setting allows for specific 
times within the ranges. 

•  Delay Timer controls the Electric Steam Valve Assembly and the Modulating Electric Valve Assembly 

duringthe sootblowing cycle causing the controller to put the Damper Actuator in an override position, 
driving thedamper(s) to the bypass position. When the Pneumatic Cylinder Assembly returns to its original 
position,the delay timer causes the Steam Valve to close and returns the Thermocouple to its normal 
function concerning the Stack Corrosion Control.

2. PNEUMATIC DRIVE CYLINDER ASSY is controlled by a solenoid valve.  The solenoid is energized at 

the beginning ofthe sootblowing cycle by the Delay Timer, allowing the ram to move outward to its 
furthest position.  At the end of its stroke the timer de-energizes the solenoid valve, allowing the 
stroke to retract to its original position. 

3. MODULATING ELECTRIC DAMPER ASSY receives a signal from the temperature controller and mod-

ulates the dampersto bypass the flow of exhaust, to maintain the desired temperature.  During the 
sootblowing cycle damper moves to the full bypass position.  This allows the soot to be blown out 
through the center of the economizer until the end of the sootblowing cycle. 

4. ELECTRIC STEAM VALVE ASSY is energized to open (5 seconds) during sootblowing operation allow-

ing 50-100 PSIG steam to the sootblower assembly - and energized again to close after the soot-
blowing cycle is complete.

5. EXHAUST TEMPERATURE INDICATING CONTROLLER(for Stack Corrosion Control) receives a signal 

from thethermocouple sensing the exhaust temperature leaving the economizer and controls the 
Modulating Electric Damper Assembly.

6. THERMOCOUPLE (for Stack Corrosion Control) is remote mounted (by others) sensing the exhaust 

gas temperature leaving the economizer.

FUNCTION

Timed Automatic Sootblower design is a fully adjustable sootblower which avoids day-to-day opera-
tor attendance by running the sootblower in specific timed intervals.  The actual blowing down of 
soot collecting on the fins utilizes special flood-jet type nozzles for achieving maximum velocity and a 
concentrated spray pattern specifically directed at the heat transfer surfaces.  The Sootblower 
Assembly contains ring nozzle assembly(s) for inward blowing per standard economizer, with a varied