Energy flow
Coal - Boiler furnished (heat energy)-Boiler(steam energy )- steam turbine (macanical energy) - altarnetare(electrical energy)
Overall efficiency of any system depend upon
,*** No of stage
Efficiency of each stage
Over all efficiency of Tharmal power plant is very low
Generally it's value is 35% to 40%
Working cycle
Tharmal power plant work on rankine cycle
Fuel
Coal
Trade name - steam coal
Steam coal is a non cakaing bituminous coal
Main fuel (coal) is used during runing condition at Tharmal power plant
At starting time of boiler furnace
Oil is used
Oil is two types
LDO(light diseal oil)
HFO( hevy fuel oil)
Type of coal
1 antracite
2 Bituminous
3 lignite
4 peat
Clorofic value of % corbon
Antracite - highest←88%
Bituminous 78% to 88%
Lignite. 60 %to 78%
Peat. Below 60%
Formetion of coal
Ash
↓
Fast stage peat
↓
Secend stage. Lignite
↓
Thard stage Bituminous
↓
Forth stage. Antracite
