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BOILER AND AUXILIARIES BURNER MANAGEMENT SYSTEM

CHAPTER 9

BURNER MANAGEMENT SYSTEM

The flammable fuel air mixture admitted to a boiler furnace is immediately ignited, burnt

and converted into inert. The product gases formed are evacuated by the draught system

so that under normal operating conditions, the furnace pressure remains very close to

atmospheric pressure.

If the ignition of the flammable mixture is delayed it leads to the accumulation of the

same in the furnace. When the accumulated mass in the furnace is ignited later, the rate

of energy release can be tremendously high which the walls of the furnace may not be in

a position to withstand that. This results in furnace explosion.

Therefore to ensure safe entry of fuel in the furnace and proper combustion of the same it

is essential to use a dedicated protection system, which is called as Burner Management

System (BMS) or Furnace Safeguard Supervisory System (FSSS).

9.1 ROLE OF BMS IN STEAM GENERATION PROCESS

When provided the BMS supervises, controls and monitors the preparation, distribution

and admission of fuel and air into the furnace. Thereby it can effectively prevent the

formation of an explosive mixture of fuel and air in any portion of the steam generator

during any phase of operation including start up and shut down.

BMS exercises authority over both operator and process controls through its safety

interlocking features. The interlocking features included in the system depends upon

1) Physical characteristics of the firing system

2) Type of fuel fired

It will not be the responsibility of B.M.S. to regulate the air and fuel flow quantities or to

initiate start up or normal shut down of firing system components.

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BOILER AND AUXILIARIES BURNER MANAGEMENT SYSTEM

9.2 BASIC REQUIREMENTS OF BURNER MANAGEMENT

SYSTEM

A BMS provided in a boiler must meet the following requirements:

It should offer maximum protection.

It should not cause any nuisance boiler trips.

Its components should consume less power.

The components of B.M.S. must be reliable and have long life.

9.3 OPERATION AND FUNCTIONS OF BMS

It will enforce and execute safety interlocking features on the operation of following

components and system of the boiler.

1) Boiler purging.

2) Secondary air damper modulation and on/off control and supervision in corner fired

boilers.

3) Igniters on/off control and supervision.

4) Light up (warm up oil) on/off control and supervision.

5) Heavy oil on/off control and supervision.

6) Pulverisers and feeders on/off control and supervision.

7) Flame scanners intelligence and checking.

8) Overall flame failure protection.

9) Boiler protection

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