Institute of Engineering & Technology,Alwar

Summer Training PresentationOn

ASH HANDLING PLANTAt

GURUNANAK DEV THERMAL POWER PLANT,BATHINDA

Presented by:-SATYAM JAINMECHANICAL(Morning)

Contents:-• Introduction & History

• Plant’s Salient Features

• Layout of Thermal plant

• Main and Auxiliary Equipments

• Coal Handling Plant

• Pulverising Plant

• Boiler

• Turbine

• Ash Handling Plant

• Cooling Towers & Ponds

• Power Transmission System

Introduction & History:-

• A Thermal Power Plant converts the heat energy of coal into electrical energy.

• Coal is burnt in furnace and in a boiler which converts water into steam. The expansion of steam in turbine produces mechanical power which drives the alternator coupled to the

turbine.

• In thermal generating stations coal, oil, natural gas etc. are employed as primary sources of energy.

• The foundation stone of G.N.D.T.P. at Bathinda was laid on 19th November 1969, the auspicious occasion of 500th birth anniversary of great Guru Nanak Dev Ji.

• Selection of the city because of :

1) Its good railway connections for fast transportations of coal.

2) Availability of canal water.

Plant’s Salient Features:- • PROJECT AREA:-

i. Power plant :- 238 acresii. Ash disposal :- 845 acresiii. Lake :- 180 acresiv. Residential colony :- 285 acresv. Marshalling yard :- 256 acresvi. Total area :- 1804 acres

• TOTAL COST :- Rs. 115 crores

• STATION CAPACITY :- The total installed capacity of the power station 440MW with four units of 110MW each.

Layout of Thermal plant:-

1. Coal handling plant2. Pulverizing plant3. Draft fans4. Boiler5. Ash handling plant6. Turbine7. Condenser8. Cooling towers and ponds9. Feed water heater10. Economiser11. Superheater and Reheater12. Air preheater

Main and Auxiliary Equipments:-

Coal Handling Plant:-

Wagon Unloading Coal Carrying Conveyor

• The function of coal handling plant is automatic feeding of coal to the boiler furnace.

• A thermal power plant burns enormous amounts of coal.

• A 200MW plant may require around 2000 tons of coal daily

Pulverising Plant:-

• coal is pulverised i.e. ground to dust like size and carried to the furnace in a stream of hot air.

• Pulverising mills are further classified as:

1. Ball mill2. Impact mill3. Contact mill

Boiler:-

• A boiler or steam generator is a closed vessel in which water under pressure, is converted into steam.

• Boilers are of two types-

1. Fire tube boiler2. Water tube boiler

Turbine:-• A steam turbine converts heat energy of steam into mechanical energy and drives the

generator. It uses the principle that steam when issuing from a small opening attains a high velocity.

Ash Handling Plant:-

• Ash is the residue remaining after the coal is incinetered.

• In a thermal plant coal is generally used as fuel and ash is produced as a byproduct of combustion.

• The percentage of ash in coal varies from 5% in good quality coal to about 40% in poor quality coal

• Power plants generally use poor quality of coal , thus amount of ash produced by it is pretty large.

• A modern 2000MW plant produces about 5000 tons of ash daily

• The stations use some conveyor arrangement to carry ash to dump sites directly or for carrying and loading it to trucks and wagons which transport it to the site of disposal

Fly ash can dispose off in two ways:-1. Dry ash System2. Wet ash System

1) Dry Ash System:-

The main parts of dry ash handling system are:-I. Electrostatic PrecipitatorII. Vacuum PumpsIII. CompressorsIV. Bag Filter TowerV. Transfer HopperVI. Surge HopperVII. DenseveyorVIII. Silos

Cooling Towers & Ponds:-

• Typically a 2000MW plant needs about 1500MGallon of water.

• Most plants use a closed cooling system where warm water coming from condenser is cooled and reused.

• Cooling tower is a steel or concrete hyperbolic structure having a reservoir at the base for storage of cooled water

Power Transmission System:-

THANK YOU!