Exit Program Major Components Component Controls Process Control System Operation System Function Circulating Water System This presentation is designed to provide you the information you need to understand and operate the Circulating Water System. You should view all slides and read and study the information presented. The presentation slides are advanced by clicking on the button. You can also advance to a selected section by using the topic buttons.. Industrial Resources, Inc. Big Cajun Power Plant
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Apr 01, 2015
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Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water SystemThis presentation is designed to provide you the information you need to understand and operate the Circulating Water System. You should view all slides and read and study the information presented.
The presentation slides are advanced by clicking on the button.
You can also advance to a selected section by using the topic buttons..
Industrial Resources, Inc.
Big Cajun Power Plant
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
In this module we will:• Describe the function of the Circulating Water System.
• Describe the flow paths and major components associated with the Circulating Water System.
• Describe the Circulating Water System process control loops and associated methods of control.
• Describe the steps required to prepare for and startup the Circulating Water System.
• Describe the steps taken during normal operation of the Circulating Water System.
• Describe the steps required to shut down the Circulating Water System.
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water System Function
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
The Circulating Water System Condenses Low Pressure Turbine Exhaust Steam.
Main Steam
Cold Reheat Steam
Hot Reheat Steam
LP Turbine Exhaust
Condenser
Circulating Water Inlet
Circulating Water Outlet
Condensate PumpHotwell
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Flow Path
Cooling Tower
Basin
Circ Water Pump
Condenser
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water System Flow Path
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water System Data
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Review QuestionsWhat is the function of the Circulating Water System?
What process is used to realease the heat from the Circulating water in the Cooling Tower?
How is the Circulating Water cooled as it flows through the Cooling Tower?
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Click to Review
Click to Review
When you are sure you can correctly answer these question
click the Button to continue
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Major Components
Circulating Water Pumps
Cooling Tower
Condenser
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water Pumps
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water Pumps
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Circulating Water Pumps Valves
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water Pumps Data
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Condenser
Circ Water InletCirc Water
Outlet Tube Sheet
Tubes
Hotwell
Outlet Waterbox
Inlet Waterbox
Waterbox Vent
LP HeaterExtraction Piping
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Condenser Waterbox Valves
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Condenser Data
Circ Water Inlet Temperatures
Circ Water Inlet Temperatures
DP Indication
Condenser Backpressure
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower
Cells
Risers
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower Fans
Risers
Bypass
Intake Screen
Cooling Tower Fans
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower Basin
Bypass
Makeup
Screen
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower Data
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower Fans Data
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Review Questions
Click to Review
What is the function of the Circulating Water Pumps?
Which Circulating Water System Valve, when open, allows a single Circulating Water Pump to supply both condenser sides?
What component mounted in the channel between the stop gate and the intake structure prevents debris from entering the pump suction?
When you are sure you can correctly answer these question
click the Button to continue
Click to Review
Click to Review
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Component Controls
• Circulating Water Pump Controls
• Cooling Tower Bypass Valve Controls
• Cooling Tower Fans Automatic Controls
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water Pump Suction Valve Controls
A
BA
B
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Circulating Water Pump Discharge Valve Controls
A
B
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Pump Cooling Water Supply
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water Pump Start/Stop Controls
Start/Stop Soft Keys
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Pump Permits and Process Trips
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Pump Lockout/Tagout
Lockout Tagout
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Circulating Water Pump Discharge Valve Controls
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Cooling Tower Controls
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Cooling Tower Bypass Valve Control
Bypass Valve
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower Bypass Valve Control
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Cooling Tower Fan Controls
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Fan Remote Start/Stop Controls
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De-icing Control
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Review Questions
How is each Circulating Water Pump motor operated suction valve typically controlled?
How is each Circulating Water Pump motor operated discharge valve typically controlled?
How is De-icing of the Cooling Tower performed?
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Click to Review
Click to Review
When you are sure you can correctly answer these question
click the Button to continue
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Process Control
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower Makeup Valve Control
Makeup Valve
Basin Level
Level Controller
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower Basin Level Controller
“A” in the grey background indicates that the level setpoint is not in automatic.
“L” in a white background indicates that the operator has local control over the Basin Level setpoint.
Brown arrows indicate basin level upper and lower limits.
Level Setpoint
Measured Flow
Valve Output percent
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Auto/Manual Control
“A” in the grey background indicates that the level setpoint is not in automatic.
“L” in a white background indicates that the operator has local control over the Basin Level setpoint.
Brown arrows indicate upper and lower Basin Level limits.
Level Setpoint
Measured Flow
Valve Output percent
Basin Level Setpoint
“A” in the grey background indicates that the level setpoint is not in automatic.
“L” in a white background indicates that the operator has local control over the Basin Level setpoint.
Brown arrows indicate upper and lower valve output limits.
Level Setpoint
Measured Flow
Valve Output percent
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Review QuestionsHow is the Cooling Tower Makeup Valve actuated and controlled?
What does the Cooling Tower Makeup Valve Controller Output Control?
Where does the Cooling Tower Basin Level setpoint come from?
When you are sure you can correctly answer these question
click the Button to continue
Click to Review
Click to Review
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Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water System Operation
• Startup Prerequisites
• System Startup
• Normal Operation
• System Shutdown
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Startup Prerequisites
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
CIRCULATING WATER SYSTEM STARTUP
• Ensure Basin Level is established and maintained
• Ensure Circulating Water Pumps are ready for Startup
• Ensure system valves are properly aligned
• Ensure support systems are available for service.
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Prepare the Cooling Tower
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Establish Basin Level
Makeup Valve
Basin Level
Level Controller
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water Pump
• Rack in pump and valve breakers
• OPEN each pump’s suction valve
• Verify motor bearing oil level’s are ok.
• Valve in instrument air and cooling water.
• CLOSE the circulating water cross-tie Circulating Water Pumps
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Cooling Tower Fans
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Align System Valves
Suction Valves
Waterbox Inlet Valves
Waterbox Outlet Valves
Discharge Cross-tie Valve
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Open the Cooling Tower Bypass
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START the “A” circulating water pump
M
A
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Check Pump Data
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
A
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Close the Cooling Tower Bypass
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Start Cooling Tower Fans
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
At 50 Percent Load, prepare for and start the 2nd Circ Water Pump
AM
M
M
Cross-tie Valve
B
M
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Re-open the Discharge Cross-tie
AM
M
MB
M
MCross-tie Valve
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
NORMAL OPERATION
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Monitor Circulating Water System process variables from DCS displays.
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Check Cooling Tower Fans
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
De-ice Cooling Tower If Required
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Circulating Water Pumps
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
SHUT DOWN
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Shut Down One Circ. Pump
M
M
M
M
A
Cross-tie Valve
B
M
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Select the Cooling Tower Fan Stop Auto Sequence
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
OPEN the Cooling Tower Bypass Valve
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
STOP the Operating Circulating Water Pump
M
M
M
M
M
A
Cross-tie Valve
B
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Secure Cooling Tower Make-up
Makeup Valve
Level Controller
Exit ProgramMajor Components Component Controls Process Control System OperationSystem Function
Review QuestionsDuring preparation for Circulating Water
System Startup, what are the four major
steps involved?
What position must the Circ. Water
Discharge Cross-tie valve be in prior to
starting the 2nd Circulating Water Pump?
During Normal Operation, how is ice removed
from the Cooling Tower?
When you are sure you can correctly answer these question
click the Button to continue
Click to Review
Click to Review
Click to Review
The Circulating Water System Condenses Low Pressure Turbine Exhaust Steam.
Main Steam
Cold Reheat Steam
Hot Reheat Steam
LP Turbine Exhaust
Condenser
Circulating Water Inlet
Circulating Water Outlet
Condensate PumpHotwell
Return to Review Questions
Cooling Tower
Return to Review Questions
Cooling Tower
Return to Review Questions
Circulating Water Pumps
Return to Review Questions
Circulating Water Pumps Valves
Return to Review Questions
Cooling Tower Basin
Bypass
Makeup
ScreenReturn to
Review Questions
Circulating Water Pump Suction Valve Controls
A
BA
B
Return to Review Questions
Circulating Water Pump Discharge Valve Controls
A
B
Return to Review Questions
De-icing Control
Return to Review Questions
Cooling Tower Makeup Valve Control
Makeup Valve
Basin Level
Level Controller
Return to Review Questions
Cooling Tower Makeup Valve Control
Makeup Valve
Basin Level
Level Controller
Return to Review Questions
Basin Level Setpoint
“A” in the grey background indicates that the level setpoint is not in automatic.
“L” in a white background indicates that the operator has local control over the Basin Level setpoint.
Brown arrows indicate upper and lower valve output limits.
Level Setpoint
Measured Flow
Valve Output percent
Return to Review Questions
CIRCULATING WATER SYSTEM STARTUP
• Ensure Basin Level is established and maintained
• Ensure Circulating Water Pumps are ready for Startup
• Ensure system valves are properly aligned
• Ensure support systems are available for service.
Return to Review Questions
Circulating Water Pump
• Rack in pump and valve breakers
• OPEN each pump’s suction valve
• Verify motor bearing oil level’s are ok.
• Valve in instrument air and cooling water.
• CLOSE the circulating water cross-tie Circulating Water Pumps
Return to Review Questions
De-ice Cooling Tower If Required
Return to Review Questions
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