OVERVIEW OF NTPC PLANT

INTRODUCTION

Korba Super Thermal Power Plant is located at Jamnipali in korba district in the Indian state of Chhattisgarh.The power plant is one of the coal based power plants of NATIONAL THERMAL POWER PLANT (NTPC). The coal for the power plant is sourced from Kusmundha and Gevra Mines. The source of water for the power plant is HASDEO RIVER.

NTPC is India’s largest energy power plant which was established in 7 Nov. 1975 to generate power development in India.

There are total 7 units in plant in which 4 units are of 500MW and 3 units are of 200MW power produce.

Total consumption of coal for producing 2600MW is about 48000 tons of coal per day.

BOILER

A boiler is closed vessel in which water is converted into steam by utilizing the heat of coal combustion. Steam boilers are broadly classified into following two types:-

(a) Water tube boiler. (b) Fire tube boiler.

WATER TUBE BOILER:-

In a water tube boiler, water flows through the tubes and the hot gases of combustion flow over these tubes. Water-tube boilers are used for high-pressure boilers.  

TURBINE

A turbine is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. In which there are THREE types of turbine used in NTPC power plant are as follows:-

a. High pressure turbine (HP).b. Intermediate pressure turbine (IP).c. Low pressure turbine LP).

a. HIGH PRESSURE TURBINE:-

HP turbine is a high pressure turbine the steam comes through the boiler first goes into HP turbine and it is a unidirectional turbine.

b. INTERMEDIATE PRESSURE TURBINE:-

In IP turbine the steam of HP turbine goes into the air preheater for reheating and after this steam flows into an IP turbine. Hence bigger piping, larger turbine is required to handle the steam flow. IP section of the turbine is bigger than HP turbine for this reason. IP turbine outlet is connected with one or two LP turbine rotors. LP turbine further expands the steam generating more energy. Intermediate pressure turbine is a bi-direction.

c. LOW PRESSURE TURBINE:-

The steam of IP turbine directly goes into a LP turbine for further expands the steam generating more energy.

LP turbine is large in size as compare to IP because it requires to handle the steam flow.

LPs are the biggest in size since they have the lowest steam pressures hence require bigger area to handle the steam flow rate. 

Fig- COMBINATION OF TURBINE MAIN TURBINE.

GENERATOR

Generator is a device which converts mechanical energy of steam comes through the turbine into electrical energy.

Generating capacity of 500MW is 21KV O/P voltage.

Existing speed of generator is 3000 rpm.

The reverse conversion of electrical energy into mechanical energy is done by an electric motor, and motors and generators have many similarities. Many motors can be mechanically driven to generate electricity and frequently make acceptable generators.

GENERATOR TRANSFORMER

Generator transformer is used to store the power

(ELECTRICITY) which is generated by the generator.FOR 500MW generator transformer gives output of 21KV of voltage and 9000Amp. Of current and for 200MW generator transformer gives output of 15.47KV of voltage.

SWITCHYARD

It is the protective part of the whole power system. Switch yard is also most essential part for transmission, distribution, and collection.

A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Between the generating station and consumer, electric power may flow through several substations at different voltage levels.

CONTENTS

INTRODUCTION. BOILER. TURBINE. GENERATOR. SWITCHYARD.