PRESENTATION ON NTPC FARIDABADBY - INSTRUCTOR -BHANU PRATAP SINGH MR. ZEESHAN HAIDERE.I. / 090105012
Faridabad – At a Glance Est. 1997, this state of the art power plant hasa production capacity of up to 430 MW. It is the only power plant in this country tosupply its entire power to a state i.e. Haryanarather than to the national grid. It consist of 2 Gas Turbines and 1 SteamTurbine.The source of fuel is Natural Gas through HBJpipeline.The water source canal is Gurgaon Canal.
What is a Combined Cycle Power Plant? A gas-fired combined-cycle power plant, also known as a Combined Cycle Gas Turbine. Power Plant, combines the strengths of two thermal processes in ideal fashion electricity production using a 1. Gas turbine together with a 2. Steam turbine The acronym normally used to describe this system is CCGT.
Compressor It intakes air from atmosphere via filter. It consists of rotors and stators. All the is done by rotor. The stator converts Kinetic Energy of fluid to Pressure Energy which is directed to the next door. The compressor has inlet vanes to guide the air to enter, the rotor increases the speed whereas the stator converts this K.E to Pressure Energy. Thus the exiting gas has both high pressure as well as temperature.
Fuel Possible sources of fuel are : Natural gas, High Speed Diesel (HSD) and Naphtha. However the use of Natural gas as prominent fuel because it has the highest specific heat Capacity or in layman’s term due to its high hydrogen to carbon ratio it produces maximum water content. Natural gas has lower exhaust gas emissions compared to diesel oil. In addition, the cost and effort needed to maintain and service turbines powered with natural gas is usually lower compared to diesel oil. Naphtha although is a good substitute to Methane, but is quite costlier.
Combustion Chamber The compressed air is fed into this chamber along with the fuel i.e. natural gas. The combustion takes place here and hot gases are produced as exhaust from it. This gas is fed to the gas turbine.
Gas Turbine – Heart of the PlantAbout the turbine NTPC uses type V94.3A2 gas turbines, manufactured by the Italian company Ansaldo, under a license provided by Siemens. The turbine weighs roughly 300 tons and yields a nominal electrical output of 143 MW. The two turbines account for the two-third of the total power produced by the plant.
Gas Turbine – Heart of the PlantProcess The combustion produced hot gases are fed into it. The hot gases are allowed to “relax” in the chamber which means they are virtually allowed to expand in an ambient temperature. This energy powers the mechanical rotation of the turbine. This rotation powers the compressor as well as the generator. The exit temperature of these gases from turbine is around 600° C.
What to do with exhaust gases with released from turbine ? Should we allow them to exit to the atmosphere ? Or Can we obtain a useful output from them ? !!
Heat Recovery Steam Generator is the answer…..
Heat Recovery Steam Generator An HRSG is a reservoir which contains water. This water is converted to its vapor by ejecting the “waste” hot exhaust gases into this chamber. The hot gases vaporize the water, thus providing another source for a mechanical rotation. It has three areas, each with a different pressure level; one high, one medium and one low. By dividing into these three levels, it is possible to harness an impressive amount of the energy contained in the exhaust gas. The vapor is then fed to the steam turbine.
Steam TurbineAbout the Turbine Manufactured by Ansaldo under a license provided by BBC (ABB). Output of 144 MW. One third of total produced in the plant.
Steam TurbineProcess Like the HRSG, it is divided into three pressure levels: one high, one medium and one low. The respective area of the steam boiler sup-plies the steam turbine with the correct steam. This is then allowed to “relax” in the turbine (similar to the gas turbine); in other words, it releases pressure. The turbine converts the steam energy into a mechanical rotation that is then transferred to the generator. There, it is transformed into electricity.
Steam Surface Condenser The source of the circulating water can be either a closed- loop (i.e. cooling tower, spray pond, etc. or from a lake, ocean, or river). The condensed steam from the turbine, called condensate, is collected in the bottom of the condenser, which is called a hot well. The condensate is then pumped back to the steam generator to repeat the cycle.
Why is the condensate also called as a Hot well ? The vapor is cooled to liquid. This water is to be reused to form vapor. Therefore the vapor is cooled to a temperature so that it just becomes liquid. Thereby less of energy will be required to again raise the temperature to convert it to vapor, which shall indeed increment the efficiency of plant. Thus the condensate is often called a “Hot” well.
The Electrical Operations Dept. at NTPC- Faridabad takes care of the running of the electrical systems as well as maintaining them. This is the largest department under the Maintenance section. This department takes care of all the electrical aspects of the plant. It takes care of the following sections- Switchyard Generator Generator Transformer Conveyor Motors and other motors All power transmission
SWITCHYARD The switchyard is the place where the station last takes care of the power it produces. The switchyard links the power generated to the Haryana Vidyut Prasaran Nigam. Power Evacuation – 2 x 220kV Double Circuit lines to Palla (Faridabad). 2 x 220kV Double Circuit lines to Samaypur (Ballabgarh).