15 Questions
What type of ignition systems do larger plants commonly have for their boilers?
Semi-automatic
What is the sequence of steps followed by all ignition systems for boilers?
Pre-purge, Pilot ignition, Main burner ignition, Run period, Post purge
What is the function of semi-automatic systems in controlling the boiler's ignition sequence?
They force the operator to complete the steps within a set time period
What is the difference between fully automatic and semi-automatic burner management systems?
Semi-automatic systems have additional safety features and may require manual operation
Why do semi-automatic systems require interaction with trained operators?
To progress through the ignition sequences due to manual control elements
What is the purpose of a pre-purge in the ignition sequence of boilers?
To remove any remaining fuel from previous operation before igniting
Which type of boiler systems automatically recycle on call for heat, regardless of operator attendance?
Fully automatic
What is the purpose of the proof of closure switches mentioned in the text?
To prevent the ignition sequence from beginning if the valve fails to close completely
Which valve ensures no gas can enter the furnace when the boiler burner is off?
Valve M
What does the local burner control panel include?
Switches to start and stop the forced draft fan, start the purge sequence, and start the burner and ignitor
What must be satisfied before the ignition sequence can begin?
Boiler water level, boiler pressure, and fuel pressure must be within their acceptable limits
What happens during startup with a boiler master on manual control?
The control output of the boiler master is set to zero (minimum fire)
When should the operator press the IGNITION START pushbutton?
As soon as the pilot flame is detected
What must be done if SSOV 'N' is of the magnetic latching valve style?
Reset it by rotating the operating lever to the CLOSED position and then back to the OPEN position
What is required for modern burners that do not have semi-automatic magnetic latching SSOVs?
Automatically open both SSOV 'L' and SSOV 'N' during the main flame trial for ignition period
Test your knowledge about fully automatic and semi-automatic burner management systems in power plant boilers. Learn about the differences in startup sequence and safety features.
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