NTPC is India's largest power company established in 1975. It operates coal power plants, including the use of a Furnace Safeguard Supervisory System (FSSS) to safely start up and shut down fuel firing equipment. The FSSS ensures safe conditions are met before ignition, monitors the flame, and immediately cuts off fuel if the flame fails. It is essential for protecting the boiler and requires proper maintenance to operate reliably.

1. BY:
JIGYASA SINGH
EC-B

2.  About NTPC.
 Brief overview of coal power plant.
 Coal to electricity.
 FSSS- Introduction.
 Significance of FSSS.
 Operation of FSSS.
 FSSS protection to boiler
 Care of FSSS.

3.  NTPC, India's largest power company, was set
up in 1975 to accelerate power development in
India. It is emerging as an ‘Integrated Power
Major’, with a significant presence in the entire
value chain of power generation business.
NTPC ranked 337th in the ‘2012, Forbes Global
2000’ ranking of the World’s biggest
companies. With a current generating capacity
of 39,174 MW, NTPC plans to become a
128,000 MW company by 2032.

4.  A power station (also referred to as a
generating station, power plant, or
powerhouse) is an industrial facility for the
generation of electric power.
 A coal-fired power station produces electricity
by burning coal to generate steam.

5.  Coal is a fuel that is found in the ground. It is
made of the remains of plants that died
millions of years ago. Soil piled up on top of
the remains and that weight compacted it into
a more dense material, called coal. The energy
in the coal came from the sun and was stored in
the plants. When the coal is burned, it gives up
that energy as heat. The coal's heat energy can
then be turned into electrical energy. This
happens at a power plant.

7. The Furnace Safeguard Supervisory System
(FSSS) is designed to ensure the execution of a
safe, orderly operating sequence in the start up
and shutdown of fuel firing equipment and to
prevent errors of omission and commission in
following such a safe operating procedure.

8. FSSS helps in achieving basic objectives repeatedly
without error to safe-guard the furnace against
hazardous effect by means of:
 Ensuring certain Safe condition established and
proved in the furnace before light up can proceed.
 In the case of unstable furnace flame condition, to
help the operator to introduce additional ignition
energy.
 In the event of flame failure fuel supply is
immediately cut off and furnace, air and gas paths
purged before any attempt is made to relight the
burners.

9.  Furnace safeguard supervisory system
comprises of controls, indications, logic to carry
out following:
 To start and complete furnace purge when all
technological conditions are fulfilled.
 To start and monitor igniters.
 To start warm up or heavy oil guns when
permissive condition exits. The guns are
allowed to burn so long as proper combustion
conditions are ensured.

10.  To start mills and coal feeders when safe
conditions exist.
 To trip out mills and coal feeders when
satisfactory conditions cease.
 To trip out all boiler fines when boiler safety is
threatened
 To monitor furnace flame.
 To start and stop igniter and scanner fans.
 To indicate auxiliary and fuel air damper close
and modulation indications.

11.  To release damper interlocks for secondary air
control.
 To provide boiler trip signal to other
equipment such as PA fans, turbine generator
etc.

12. COMBUSTION SYSTEM

13. By tripping out all fuel i/p under the
following condition :
 Loss of D.C. to FSSS
 Furnace pressure inadequate.
 Less than fire ball load and loss of A.C. on any
elevation in service.
 Drum level high or low.
 Flame failure trip.
 Both PA fan off.
 Low air flow.

14. It is essential that all parts of the Furnace
Safeguard Supervisory System are in service at
all times, if the system is to provide protection
for which it is designed. Proper maintenance
and periodic inspection of the system and
associated hardware is essential for continued
reliable operations.