This slide consists of the basic

2. SELECTION OF SITE FOR STEAM
POWER PLANT
Availability of land
Availability of sufficient amount of good boiler feed
water and cooling water
Availability of fuel.
Necessity for future expansion.
Availability of other power other power services
Away from urban areas
Initial cost of plant
Magnitude and nature of load to be handled

3. LAY OUT OF STEAM POWER
PLANT

5. GENRAL LAYOUT
Fuel handling unit
Ash handling unit
Boiler unit
Feed water unit
Cooling water unit
Generator unit
Turbine unit

6. MAIN FLOW CIRCUITS
Fuel and ash circuit
Air and gas circuit
Feed water and steam circuit
Cooling water circuit

7. FUEL AND ASH CIRCUIT
Fuel stored is fed to boiler through conveyer belt.
Coal – particular size for complete burning.
Coal is passed through crushers , sizers and magnetic
separators before feeding to boiler.
As a result of combustion, ash is produced from coal
fuel which is removed from boiler through ash
handling equipments.

8. AIR AND GAS CIRCUIT
Air is required for complete combustion of the
fuel – supplied through Forced draught(FD) and
Induced draught(ID) fans.
Air which is fed to the boiler, is passed through
preheater – to extract energy of flue gases from
boiler.
Flue gas consist of several gases and ash – passed
through precipitator and finally go to atmosphere
via chimney .

9. FEED WATER AND STEAM
CIRCUIT
Most power plants are condensing type – steam is
converted to water by condenser.
For safety of turbine water is demineralized – better
economic operation
Adding make up water in feed water system
compensate leakages.
The boiler feed pump (BFP) feeds water to boiler
drum – heated to form steam.
Wet steam heated in super heater passed to turbine
and runs it

10. FEED WATER AND STEAM
CIRCUIT
Stages of prime mover depending on size of power
plant
1. High Pressure Turbine HP
2.Intermediate Pressure Turbine IP
3. Low Pressure turbine LP

11. FEED WATER AND STEAM
CIRCUIT

12. COOLING WATER CIRCUIT
To condensate the steam in condenser and
maintaining low pressure in it, large quantity of
cooling water is required.
After passing it through condenser, it is fed
back to river or pondage.
Cooling tower or cooling ponds are used in
case of shortage.
Drawback- Excessive water loss

13. PARTS OF STEAM POWER
PLANT
Boiler- Water tube boiler
Coal Mills
Boiler feed pump- high capacity IM
Air preheater- extract heat from flue
gases
Draught system- supply air to the furnace
and to take the flue gases from the boiler
Economizers- extract heat from flue

14. PARTS OF STEAM POWER
PLANT
Superheaters and Reheaters
Turbines
Condenser
Cooling tower
Alternators- high speed synchronous
generators

15. COOLING OF ALTERNATOR
Important due to damage of insulation at
high temperature.
Closed circuit cooling widely used in
modern alternators (Hydrogen as cooling
medium).

16. ADVANTAGES OF HYDROGEN
COOLING
More heat transfer and thermal conductivity is
7 times more than air.
Low ventilation losses
Life of insulation is more as no oxidation of
insulating material .
Fire hazards minimized
Less noise
Size of frame reduced

17. DISADVANTAGES OF
HYDROGEN COOLING
Chances of formation of explosive
mixture.
Expensive than air
Special oil seals required
Problem of ensuring complete tightness
of hydrogen