SEMINAR ON SUMMER TRAINING
NTPC .LTD SHAKTINAGAR
RAM NARAYAN SHAH
“A world class integrated power major, powering India's growth with increasing
NTPC was set up in 1975 with 100% ownership by the Government of india.
NTPC has installed capacity of 29,394 MW.
It has 15 coal based power station (23,395MW) &7 gas based power
4 power stations in joint venture (1794MW)
In 1997, Government of India granted NTPC status of “Navratna” company.
NTPC has embarked on plans to become a 75,000 MW company by 2017.
A boiler is a closed vessel in which water is
converted into steam by utilising the heat of
Steam boiler are broadly classified into
following two type: (a)-water tube boiler
&(b)- fire tube boiler.
In water tube boiler water flows through the
tube and the hot combustion gases flows
over these tubes. Water tube boilers are used
for high pressure boiler.
A device which removes last traces of moisture.
It helps in reduction in requirement of steam
steam being dry reduces the mechanical resistance of
No corrosion at the turbine blades.
They are such devices which recover the heat
from the flue gases on their way to chimney
and raise the temperature of feed water.
Air Pre-heaters recover the heat from the flue
gases leaving the economiser and heat the
incoming air required for combustion.
Which condenses the steam at the exhaust
It creates a very low pressure at the exhaust
of turbine, this helps in converting heat
energy of steam into mechanical energy
in the prime mover.
The condensed steam can be used as feed
water to the boiler.
A steam turbine is a mechanical device that
extracts thermal energy from pressurized steam,
and converts it into mechanical energy.
About 86% of all electric generation in the world
is by use of steam turbines.
It has almost completely replaced the
reciprocating piston steam engine.
Turbo generator :
An turbo generator is coupled to a steam turbine and converts mechanical
energy of the turbine into electrical energy.
It may be hydrogen or air cooled. Rating of turbo generator is normally
200MW & 500MW.
(a) main step-transformers, which steps-up generated voltagetransmission
(b) station transformers, general purpose.
(c) auxiliary transformers, which supply to individual unit-auxiliaries.
which locates fault on the system and isolate faulty part fromhealthy
section.It contains circuit breakers, relays, switches and other controldevices.
Source of coal=Jayant mines(madhya
Location of source=Near singrauli(madhya
Distance of source from plant =5km.
Type of coal-D grade.
Coal requirement: 25,000 MT/day
Generally thermal power stations use coal
mills or called coal firing system.
Coal is reduced to fineness (-20mm).
This fine powdered coal is called pulverized
coal and is carried forward to the burner by
air through pipes.
A natural result from the burning of fossil fuels,
particularly coal, is the emission of fly ash.
Ash is mineral matter present in the fuel. For a pulverized
coal unit, 60-80% of ash leaves with the flue gas.
Electrostatic precipitator has series of collecting & emitting
electrodes in a chamber.
At the inlet of the chamber there are distributer screen.
Hooper and flushing system form a base of chamber.
Efficiency of ESP is approx. 99.8%