Gas Power PlantNT PC A NTA (R A J A ST HA N)

Saurabh Tiwari

B.Tech (EEE)13th November, 2014

Topics to be covered:

• Introduction

• Gas turbine

• Generator

• Units Configuration

• Start-up And Applications of Gas Turbines

• combined cycle process

• Waste heat recovery boiler(WHRB)

• Steam turbine

• Power evacuation

IntroductionNTPC Ltd.

NTPC Limited is the largest power generating company of India.

A public sector company, it was incorporated in the year 1975 to accelerate power development in the country as a wholly owned company of the Government of India.

Total installed Capacity of NTPC Ltd. Is 43,128 MW

15 coal based (24,395 MW),

7 gas based (3,955 MW)

Units Configuration:

GT1A 88.71

GT1B 88.71

GT1C 88.71

ST1C 153.2

Total Station Capacity-419.33 MW

419.33 MW

Gas Turbine

Gas Turbine is a heat engineThe Process Includes:

Compression :Drawing air into the engine, pressurizing it, and then feeding it to the combustion chamber.

Combustion :typically made up of a ring of fuel injectors that inject a steady stream of fuel into combustion chambers where it mixes with the air. The combustion produces a high temperature, high pressure gas stream that enters and expands through the turbine section.

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 0 to 600rpm. At this speed a pilot flame is ignited in the combustion chamber, fuel (gas/naphtha) enters and combustion takes place.

Start-up of the Gas Turbine

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.

COURTESY:

Simplified Prototype of Steam Turbine’s Working.

Applications of Gas Turbine

Conventional applications are

Simple cycle operation.

Combined cycle operation.

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

Simple Cycle Operation

A simple cycle operation turbine(SCCT) is a type of gas turbine most frequently used in the power generation, aviation (jet engine), and oil and gas industry (electricity generation and mechanical drives).

Combined Cycle Power Plant

The Combustion Turbine

Natural gas is mixed with air and burned in the combustion chamber to create the high pressure gasses needed to spin a turbine. This part of the plant is a single cycle, combustion turbine. These are sometimes called CTs. CTs are normally designed to meet peak loads.

A combined cycle power plant is a dual cycle plant. The "2nd" part of the combined cycle is a heat recovery unit. It takes advantage of the energy in the exhaust gasses to create steam. The steam spins a steam turbine to generate additional electricity. The combined cycle plants are normally designed to meet base and intermediate loads.

The Combined Cycle Plant

Heat Recovery Steam Generators*

Waste Heat Recovery Boiler(WHRB)

Heat Recovery Steam Generators (HRSG) have found application in a wide range of industries where the cogeneration of steam and electricity is required, in order to obtain an independent power plant and negligible emission levels.

Heat Recovery Steam Generator

Power Evacuation From NTPC ANTA

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

two lines for Bhilwara,

two lines for Jaipur and

one line for Kota and

one line for Rawatbhata power plant

Thank You!Thank You!