Presentation on Industrial Training AtNTPC LtdGas Power Plant, AntaBaran (Rajasthan) Presented by:ed By:Rinku kr. meenaElectrical Engg. BranchC. R. No. 09/049 Presented to: to:Mr.A.K.SharmaElectrical Engg. Dept.UCE (RTU)

IntroductionNTPC LTD.NTPC Gas Power Plant AntaCombined Cycle ProcessWaste Heat Recovery Boiler220 kV Switchyard of NTPC AntaTopics to be covered

NTPC Limited is the largest power generating company of India.

It was founded on Nov 7, 1975 as a wholly owned company of the Government of India.

The installed capacity of NTPC is 31,134 MW .

22 Thermal Power Plants comprises of 15 coal based and 7 gas based station.

NTPC Limited

Anta Gas Based Combined Cycle Power Project is not only the first Gas Power Plant of NTPC but is also the beginning of an era of state of art Combined Cycle Power Plants in the country.

Established in: 1989 Type of station: Gas based combined cycle Location: Anta in Baran district of Rajasthan Total land: 390.75 acres. Fuel: Natural Gas, Naphtha Fuel source : By GAIL through HBJ Pipe line Water source : KOTA RIGHT MAIN CANAL Reservoir: 10 Million m3 , for One Month Gas Turbine Output: 3 X 88.71 MW Steam Turbine Output: 153.20 MW Net plant Output: 419.33MWNTPC Gas Power Plant Anta

The Process Includes

Compression :of working medium (air) taken from atmosphere in a compressor.CombustionIncrease of working medium temperature by constant pressure ignition of fuel in combustion chamber.Expansion of the product of combustion in a turbine.

Start-up of the GT Start-up of the GT is driven with the help of starting equipment which runs the generator as a motor with speed increasing from 0to 600rpm. At this speed a pilot flame is ignited in the combustion chamber, fuel (gas/naphtha) enters and combustion takes place.

The speed increases further both with the help of generator motoring and the combustion of fuel up to about 2000 rpm. At this speed starting equipment is switched off and only the generator is made ready for synchronization with the grid. After synchronizations, the turbine load increases up to base load with more and more fuel entering the combustion chamber.

Applications of Gas TurbineConventional applications areSimple cycle operation.Combined cycle operation.

Electric utility companies use gas turbine predominantly in simple cycle and combined cycle applications. Combined cycle operation is much efficient than open cycle operation.

Combined cycle power plant integrates two power conversion cycles Bratyon cycle (gas-turbine) and Rankine cycle (steam-turbine)

with the principal objective of increasing overall plant efficiency.COMBINED CYCLE

AirFuelExhaust gasSteam TurbineSteamGGWHRB15%100%33%16%36%Gas TurbineInputCondensorCombined Cycle Process

Gas turbine exhaust is at temperature of 500-550 c Rankine cycle heat is required to generate of 500-550 c Gas turbine exhaust heat can be recovered using a waste heat recovery boiler to run a steam turbine on Rankine cycle If efficiency of gas turbine cycle is 33% and the efficiency of Rankine cycle is 35% then over all efficiency comes to 49%.Combined Cycle Process

GAS GENERATORSalient Features1. Generator Type :Non Salient PoleSynchronous generator2. No. of phases:33. No. of poles:24. Stator winding:star5. Insulation class:F class6. Rated apparent power :135MVA7. Rated voltage:10.5 KV8. Rated current :7423 A9. Full load efficiency:98.38%10. Type of cooling : Air cooled

Steam GeneratorSalient Features1. Generator Type :Non Salient Pole Synchronous generator 2. No. of phases:33. No. of poles:24. Stator winding:star5. Insulation class:F 6. Nominal apparent power:160 MVA7. Nominal voltage:15.75 KV8. Full load efficiency:98.38%10. Cooling a) Stator : Air cooled by fans b) Rotor : Axial cooling

Waste Heat Recovery Boiler Anta Combined cycle power plant also known as Waste Heat Recovery Boilers (WHRB) plant, which are of non-fired, dual pressure and forced circulation type. The boiler has two different water/steam cycle known as high-pressure system and low-pressure system.

Components of WHRB The main components of the WHRB can be divided into following categories:LP EconomizerLP Drum & EvaporatorLP Super-heaterHP EconomizerHP Drum & EvaporatorHP Super-Heater

A Switchyard is the place at which switching operation of power distribution is performed.

NTPC-Anta Gas Power Station has a 220 kVSwitchyard which is used for switching operationand power evacuation for six 220 kV transmission lines.220 kV Switchyard

Bus-BarBus CouplerCurrent Transformer (CT)IsolatorEarthing Switch (E/S)Lighting Arrester (LA)Circuit Breaker (CB)Capacitive Voltage Transformer (CVT)Battery BankDiesel-Generator Set (DG Set) etc.Main Components of 220kV Switchyard

Single Line Diagram (220kV Switchyard)

There are total six 220 kv transmission lines for evacuation of power generated at Anta.

Two lines for Bhilwara, One lines for Dausa, One lines for Sawai Madhopur, One line for Kota and One line for RAPP. POWER EVACUATION FROM NTPC-ANTA