ApplicationSolution

INTRODUCTIONThe Foxboro® I/A Series® Burner Management application solution is designed to improve plant operations, provide safe, reliable boiler startup, shutdown, and operation of the burners and associated fuel equipment in the most efficient and logical manner. Based on Foxboro’s extensive knowledge and experience in the power industry, this application solution includes the technology and engineering services necessary to maximize plant operating efficiency, safety, and availability.

I/A Series SystemBurner Management

FUNCTIONThe Burner Management System (BMS) is a safety system, which permits the safe startup, operation, and shutdown of boilers. It interfaces with field devices that are primarily digital (on/off), executes sequential control logic utilizing flame monitoring devices, pressure switches, flow switches, limit switches to determine boiler status. Major system functions include:

1. Boiler Purge2. Master Fuel Trip (MFT) Condition including first out3. Fuel Tripping including first out4. Safety Interlocking5. Flame Detection6. Grouped initiation of ignition and shutdown7. Supervise and control mill and/or burner startup and shutdown sequences8. Alarm abnormal conditions

SYSTEM DESIGN PHILOSOPHYInvensys’ Foxboro Burner Management Systems are designed to direct the operators through a sequential procedure for boiler startup, shutdown and handling of abnormal conditions. The BMS prevents burner startup if proper conditions have not been met and initiates burner shutdown if unsafe conditions exist.

The BMS design features energize to trip as well as fail safe logic, which is based on the latest NFPA guidelines. The BMS logic is executed in an independent fault tolerant control processor. This is true whether the BMS is a separately supplied, stand-alone system, or integrated within a total plant control and monitoring system.

Invensys’ Burner Management logic implemented within Foxboro’s I/A Series System is applied by experienced Engineers who understand burner management system requirements. The overall system design philosophy incorporates “no single point of failure” that would prevent the boiler from being shut down, either automatically by BMS (MFT) or manually by the operator, or would cause an inadvertent shutdown of burner equipment, or prevent the boiler from being tripped either automatically by the BMS Logic or manually by the operator.

All I/A system failure modes are included within the logic design such that loss of any I/A Module or power to the system is not only alarmed, but designed to provide safe operation.

IMPLEMENTATIONFoxboro’s BMS is implemented within the Intelligent Automation (I/A) Series System.

• I/A is a highly reliable and secure system incorporating Fault Tolerant Control (the highest level of redundancy)

• I/O modules that are distributed for burner segregation and reliable field level signal compatibility (reducing the need for interposing relays)

•Redundant power distribution (accepting either AC or DC as source power)•Online diagnostics for complete health monitoring of the entire system• Independent trip equipment to comply with code

Foxboro’s BMS utilizes the same field proven I/A Series system components as those applied to combustion control, turbine control, plant logic, and data acquisition applications. When integrating the I/A BMS with the rest of the I/A Series plant controls, users quickly see the benefits of plant integration including:

•Common hardware/software• Integrated CRT graphics•Elimination of new system training•Reduced spare parts inventory

Foxboro’s BMS provides continuous safety monitoring for applications ranging from simple, single fuel to complex, multiple fuel, and multiple burner units. Over tens of thousands Megawatts of power are safely operated by Foxboro’s burner management applications utilizing the I/A Series System. Our implementation includes adherence to published guidelines, selecting the most reliable hardware platform, the use of only experienced engineers, and thorough support services required for the safe startup, operation, and shutdown of the fuel system.

BENEFITS•Continuous startup and operational monitoring with safety tripping•Reliability through consistent operation of major equipment using the same type•Manpower availability and reductions with fewer operating personnel required•Better maintenance with minimum abuse and misoperation of major equipment• Improved status monitoring with field faults immediately identified

STANDARD SOLUTION SERVICESFoxboro engineers who are knowledgeable in power systems engineering and technology are available to provide services on customer projects from inception to completion. Their services include functional design, detail design, software implementation, staging and testing, user training, and startup.

Invensys, the Invensys logo, ArchestrA, Avantis, Eurotherm, Foxboro, IMServ, InFusion, SimSci-Esscor, Triconex, and Wonderware are trademarks of Invensys plc, its subsidiaries or affiliates. All other brands and product names may be the trademarks or service marks of their representative owners.

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Rel. 04/10