10 Questions
What is the primary function of the Burner Management System (BMS)?
To monitor and control the proper sequence of fuel firing equipment
What is the purpose of the purge cycle in the BMS?
To complete the furnace purge cycle prior to firing fuel
What is the function of the trip valve in the BMS?
To initiate a fuel trip when abnormal conditions exist
Why is it essential to ensure all parts of the BMS are in operable condition?
To provide the function for which the system is designed
What is the purpose of the ignition system in the BMS?
To ignite the fuel during start-up
What is the purpose of the flame scanner in the BMS?
To monitor the flame during operation
What happens when certain abnormal operating conditions exist in the BMS?
A fuel trip is initiated
What is the purpose of the heavy oil trip valve in the BMS?
To initiate a trip when abnormal conditions exist in the heavy oil system
Why is it important to recognize that abnormal operating scenarios may be encountered during unit operation?
To prepare for potential safety risks
What is the purpose of the gas trip valve in the BMS?
To initiate a trip when abnormal conditions exist in the gas system
Study Notes
Burner Management System (BMS) Logic
- Plant specific administrative and/or safety policies and procedures take precedence if in conflict with this document.
System Functions
- Ensure a furnace purge cycle is completed before firing any fuel.
- Prevent start-up of individual fuel firing equipment unless permissive interlocks are satisfied.
- Monitor and control the proper component sequence during start-up and shutdown of fuel firing equipment.
- Ensure safety interlocks remain satisfied during operation of fuel firing equipment.
- Provide component status feedback to the Operator and the unit control system.
- Initiate a fuel trip when abnormal operating conditions exist.
Ignitor Gas Leak Test
- Activated by the "Test Start" push button.
- Consists of two 60-second phases:
- Phase 1: Test corner trip valves and riser vent valves for leakage.
- Phase 2: Test header trip valve for leakage.
Ignitor Gas Header Trip Valve
- Automatically closes if:
- Ignitor gas header pressure is low or high.
- No master fuel trip signal exists.
- No close command for the Ignitor Gas Header Trip Valve exists.
- Nozzle tilts are not horizontal or airflow is ≥ 40% or any fuel elevation is in service.
System Pressurization
- Enables the leak test by pressurizing the ignitor gas piping downstream of the header trip valve.
- Involves closing all ignitor gas riser vent valves and sending an "open command" to the Ignitor Gas Control Valve.
Miscellaneous
- All parts of the BMS must be in operable condition and in service at all times.
- Recognize that abnormal operating scenarios may be encountered during unit operation.
This quiz covers administrative and safety policies, as well as procedures related to BMS controls, including fuel sequential tripping and light/heavy oil start/stop control.
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