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NATIONAL THERMAL POWER CORPORATION

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BRIEF NTPC-AN INTEGRATED POWER MAJOR
A journey towards excellence established in 7 Nov. 1975, NTPC limited, a premier sector enterprise, is India’s largest power utility with an installed capacity of 27,904MW through 26 power station including station operated under joint exploration, power distribution trading and also plans to enter into nuclear power development. NTPC plans to become a 50,000MW Company by 2012 and 75,000MW plus company by 2017. The company contributed 29.25% share of the total installed capacity of the nation including capacity and generation of joint venture companies
.

1.1 COMBINED CYCLE TECHNOLOGY:-
The year was 1985, government of India decided to effectively use the “sweetened natural gas”, which was to be made available by “GAIL” through cross-country HBJ gas pipe line NTPC was entrusted with a responsibility to set up gas based power project in Gujarat, Rajasthan and Utter Pradesh, NTPC submitted the feasibility reports for 3 gas based projects at Anta (Rajasthan), Auraiya (U.P) and Kawas (Gujarat).
The feasibility report of anta was approved by government of India in October, 1986. The land was simultaneously acquired, bhoomi poojan of the land to start the work performed on 16.01.1987 by the then CMD shri M.L. shishoo, and the charging of “construction power” was inaugurated.


1.2 MILE STONE:-
Govt. approval of feasibility report - 20.10.86
Bhoomi poojan - 16.01.87
Award of main plant turnkey contract - 24.08.87
Synchronization of GT-1 - 20.01.89
Synchronization of GT-2 - 04.03.89
Synchronization of GT-3 - 04.05.89
Synchronization of ST - 09.03.90
Location : anta in Baran district of Rajasthan
Total land : 390.75 acres.
Fuel : natural gas naphtha
Water source : KOTA RIGHT MAIN CANAL
Net plant output : 419.33 MW


1.3 SALIENT FEATURES OF ANTA
GAS TURBIN :89, TYPE 13D-2, ABB MAKE, 5TH STAGE REACTION TURBINE
GT COMPRESSR : 18TH ST; AGE AXU\IAL FLOW, REACTION BLADING
COMBUSTION CHAMBER :SINGLE SILO TYPE, DUAL FUEL FIRE BURNER
AIR INTAKE FILTER :SELF CLEANIN, SYNTHETIC PAPER, TOTAL 945 FILTERS IN THREE TIRES
BYPASS STACK :VERTICAL 25M. HIGH
WASTE HEAT RECOVERY UAL PRESSURE, DOUBLEDRUM, UNFIRED, FORCED CIRCULLATION BOILER PRESSURE FLOW TEMP HP 62.70 BAR 163 T/HR 485℃
LP 5.5 BAR 39.1 T/HR 207℃
STEAM TURBINE :153.20MW, TANDEM COMPOUNDED , DOUBLE EXHAUTST, CONDENSING TYPE, SINGLE FLOW HORIZONTAL 25 STAGE HP TURBINES.
CONDENSOR OUBLE PASS SURFACE CONDENSOR WITH STAINLESS STEEL TUBES, COOLING 13988M3.

NATIONAL THERMAL POWER CORPORATION

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INTRODUCTION

Simhadri is the ambitious project of the National Thermal Power Corporation (NTPC) intended to provide the ever growing power needs of the state of Andhra Pradesh. Infact, NTPC comes to the rescue of about 20 million units of power consumed every day in Andhra Pradesh. The construction work of the project is under way. Mr. R.C. Srivatsav has been appointed as the General Manager for the Simhadri Project Operations. With the completion of the project, the total power generation capacity of NTPC will reach to 3600 MW in Andhra Pradesh with NTPC Ramagundum already generating 2100 MW a day.

The Project was developed near Parawada and 3384 acres of land was allocated for the construction of the Thermal plant. The height of the Chimeny is 275-feet - a record in Asia for being the tallest factory chimeny. Near to this is the 165-meter two cooling towers. The Coal for the project will be coming to the plan with a special rail line setup for this. Coal will be drawn from the Mahanadi Coal Fields in Orissa drawing over 6 Million tonnes of coal every year. The Coal transport for the NTPC Simhadri Project is expected to begin in December 2002.
The water intake for the project for cooling is done by sea water drawn from 8.9 kms away from the Bay of Bengal through an intake-well sized 9100 cubic meters. This intake-well is again the biggest well constructed in the entire India. The project also gets Sweet water from the Yeluru canal.
The power generated at NTPC Simhadri will be bought by AP Transco - the power distribution arm of the Electricity Board in the state. The approximate selling price of power is expected to be at Rs. 2.10 as against to the price from private power generation companies which was at Rs. 3 - 4 per unit.
The 500 MW First Boiler at the NTPC Simhadri Boiler was ignited on November 6, 2001.
This is a mile stone in the history of NTPC Simhadri. The commencement of the 500 MW first unit is expected to begin in March 2002 while the second unit is expected to begin by December 2002.
To save the environment from pollution, NTPC Simhadri has taken ample steps. Towards this is the project of planting trees and maintaining greenery around the site.


SINGLE LINE DIAGRAM OF THERMAL POWER PLANT

Initially the coal is brought through railway wagons from Talcher Coal Fields and is unloaded at the Track Hopper in the coal handling plant where the Paddle Feeder which feeds the coal onto the conveyor belt. The conveyor belt takes the coal through metal detectors and magnetic separators and to remove any unwanted material in the coal. The coal then crushed in the crushers to the size of 20mm. From there, the coal is fed to the coal bunkers at the boilers. There are 18 sets of coal bunkers (Nine for each boiler).
From the bunkers, coal is passed into coal mills, which is pulverized coal is made into fine power. From here, coal is mixed with air and is forced into the boiler from four sides with the help of forced draught fans. Inside the Boiler, the coal is fired and a ball of fire is formed.


THERMAL POWER PLANT

To establish the thermal power plant following resources should be available to run the plant more effectively.
1. Land: This land is suitable for both Rail and road Transportation.
2. Source of Raw material: coal
3. Source of water: Both sweet water and cooling Water
4. Skilled Manpower
5. Proper Ash Disposal system.


COAL HANDLING PLANT

Coal handling plant occupies the majority area at NTPC. The main function of coal handling plant is unloading of raw coal and transportation of same up to the Boiler without any interruption. The major supply of coal to the plant is from Talcher and IB Valley coal mines in Orissa. The other source of Coal is imported from Indonesia as and when required. The average consumption of coal is 380 tones per hr. per boiler of 500MW i.e., approximately 9120 tones per day per boiler.