29-11-2012, 01:17 PM
NATIONAL THERMAL POWER CORPORATION , BADARPUR
NTPC EDITTED.doc (Size: 5.95 MB / Downloads: 157)
ABSTRACT
NTPC focuses on continuous improvement and up gradation, with state-of-the-art principles and equipment, setting high targets and reviewing its performances. NTPC recognizes its responsibility towards protecting the ecology, health and safety of the employees and consumers.
The training was organized by the NATIONAL THERMAL POWER CORPORATION LIMITED. The purpose of the training is to get an industrial exposure in our engineering career.
Students can learn a lot from different books about various subjects such as operations of a plant, various constituents of a plant, power production, power distribution etc. but a practical experience helps in better understanding and enhancement of knowledge in various subjects. We are grateful to NATIONAL THERMAL POWER CORPORATION LIMITED for organizing this training.
INTRODUCTION TO NTPC
The operating performance of NTPC has been considerably above the national average. The availability factor for coal stations has increased from 85.03 % in 1997-98 to 90.09 % in 2006-07, which compares favourably with international standards. The PLF has increased from 75.2% in 1997-98 to 89.4% during the year 2006-07 which is the highest since the inception of NTPC.
In Badarpur Thermal Power Station, steam is produced and used to spin a turbine that operates a generator. Water is heated, turns into steam and spins a steam turbine which drives an electrical generator. After it passes through the turbine, the steam is condensed in a condenser; this is known as a Rankine cycle. The electricity generated at the plant is sent to consumers through high-voltage power lines.
The Badarpur Thermal Power Plant has Steam Turbine-Driven Generators which has a collective capacity of 705MW.
The fuel being used is Coal which is supplied from the Jharia Coal Field in Jharkhand.
Water supply is given from the Agra Canal.
THERMAL POWER PLANT
INTRODUCTION
Power Station (also referred to as generating station or power plant) is an industrial facility for the generation of electric power. Power plant is also used to refer to the engine in ships, aircraft and other large vehicles. Some prefer to use the term energy center because it more accurately describes what the plants do, which is the conversion of other forms of energy, like chemical energy, gravitational potential energy or heat energy into electrical energy. However, power plant is the most common term in the U.S., while elsewhere power station and power plant are both widely used, power station prevailing in many Commonwealth countries and especially in the United Kingdom.
At the center of nearly all power stations is a generator, a rotating machine that converts Mechanical energy into Electrical energy by creating relative motion between a magnetic field and a conductor. The energy source harnessed to turn the generator varies widely. It depends chiefly on what fuels are easily available and the types of technology that the power company has access to.
FUNCTIONING
In a thermal power plant, one of coal, oil or natural gas is used to heat the boiler to convert the water into steam. The steam is used to turn a turbine, which is connected to a generator. When the turbine turns, electricity is generated and given as output by the generator, which is then supplied to the consumers through high-voltage power lines.
Detailed process of power generation in a thermal power plant:
1) Water intake: Firstly, water is taken into the boiler through a water source. If water is available in a plenty in the region, then the source is an open pond or river. If water is scarce, then it is recycled and the same water is used over and over again.
2) Boiler heating: The boiler is heated with the help of oil, coal or natural gas. A furnace is used to heat the fuel and supply the heat produced to the boiler. The increase in temperature helps in the transformation of water into steam.
3) Steam Turbine: The steam generated in the boiler is sent through a steam turbine.The turbine has blades that rotate when high velocity steam flows across them. This rotation of turbine blades is used to generate electricity.
STEAM GENERATOR/BOILER
The boiler is a rectangular furnace about 50 ft (15 m) on a side and 130 ft (40 m) tall. Its walls are made of a web of high pressure steel tubes about 2.3 inches (60 mm) in diameter. Pulverized coal is air-blown into the furnace from fuel nozzles at the four corners and it rapidly burns, forming a large fireball at the center. The thermal radiation of the fireball heats the water that circulates through the boiler tubes near the boiler perimeter. The water circulation rate in the boiler is three to four times the throughput and is typically driven by pumps. As the water in the boiler circulates it absorbs heat and changes into steam at 700 °F (370 °C) and 3,200 psi (22.1MPa). It is separated from the water inside a drum at the top of the furnace. The saturated steam is introduced into superheat pendant tubes that hang in the hottest part of the combustion gases as they exit the furnace. Here the steam is superheated to 1,000 °F (540 °C) to prepare it for the turbine. The steam generating boiler has to produce steam at the high purity, pressure and temperature required for the steam turbine that drives the electrical generator. The generator includes the economizer, the steam drum, the chemical dosing equipment, and the furnace with its steam generating tubes and the superheater coils. Necessary safety valves are located at suitable points to avoid excessive boiler pressure. The air and flue gas path equipment include: forced draft (FD) fan, air preheater (APH), boiler furnace, induced draft (ID) fan, fly ash collectors (electrostatic precipitator or baghouse) and the flue gas stack.