type of Turbines

8/13/2019 type of Turbines

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Faradays Law of Electromagnetic

Induction

Production of a

potential difference

(voltage) across a

conductor when

magnetic field around it is

varied.

It can also be inducedin the coils if they are

moved in the constant

magnetic fields.


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This is the basic principle underlying the

electrical generators.

If the wire is connected through an

electrical load , current will flow, and thuselectrical energy is generated, converting

the mechanical energy of motion to

electrical energy.


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A dynamo machine consists of a stationary

structure, which provides a constant

magnetic field, and a set of rotating

windings which turn within that field.


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What is a Gas Turbine?

A gas turbine is a machine delivering

mechanical power or thrust.

A gaseous working fluid is employed to run

the turbine.

The working fluid flows continuously with

in the turbine and after losing its energy is

released out as low pressure exhaust in tothe atmosphere.


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Parts of the Gas Turbine Power

Plant:

Compressor: draws air into the engine,pressurizes it, and feeds it to thecombustion chamber at speeds ofhundreds of miles per hour.

Combustion Chamber : Typically made upof a ring of fuel injectors that inject a

steady stream of fuel into combustionchambers where it mixes with the air. Themixture is burned at temperatures of morethan 2000 degrees F.


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The combustion produces a high

temperature, high pressure gas streamthat enters and expands through the

turbine section.

Gas Turbine :is a series of alternatestationary and rotating aerofoil-section

blades. As hot combustion gas expands

through the turbine, it spins the rotating

blades.


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The basic construction of a gas turbine

employs vanes or blades mounted on a

shaft and enclosed in a casing.

The flow of fluid through turbine in most

designs is axial to the rotor.

There are two types of blades used in all

turbines.

Those that are fixed on the rotor and

move with the shaft.


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Those that are fixed to the casing and help

to guide and accelerate or decelerate the

flow of fluid, being called fixed blades or

vanes.


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The cycle that is present is known as the

Joule-Brayton cycle.This cycle consists of four important

points.

Starting at position 1 where the gas haspassed through the inlet, after that the gas

then passes through the compressor. The

gas is then heated in the combustor. (Point

3.)Finally, the gas is expanded in the

turbine. (Point 4.)


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What is Steam Power Plant?

A Steam Turbine is a device which converts

the heat energy of steam into the kinetic

energy & then to rotational energy.

The Motive Power in a steam turbine isobtained by the rate of change in

momentum of a high velocity jet of steam

impinging on a curved blade which is freeto rotate.


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Components of a Steam power

plant

Boiler: Here water is converted into steam,either superheated or saturated,

depending upon the conditions required.

It can be water-tube boiler or Fire-tube

boiler.

Condenser Condenser is a heat exchangerthat condenses the steam back to water.Pump it is employed to raise the water

back to the level of boiler.


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Fuel is burnt to produce steam in the

boiler. Any fuel can be used to produceheat ranging from coal to bagasse.

The steam from the boiler is expanded in a

nozzle, resulting in the emission of a highvelocity jet. This jet of steam impinges on

the moving vanes or blades, mounted on a

shaft.

Steam after losing its energy leaves the

turbine and enters into condenser.


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After condensation the water is pumped

up, through a feed water pump, to theboiler again and the cycle continues.

This cycle is known as Rankinecycle

Diff b GTPP & STPP


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Difference between GTPP & STPP

Gas Turbine Steam TurbineWorking fluid is any Gas. Working fluid is steam.

Compressor is used for

transporting the working

fluid.

Pump is used for

transporting the working

fluid.

Fuel and working fluid are

same.

Fuel is different from the

working fluid.

Combustion chamber is

present.

Boiler replaces the

Combustion chamber.Gaseous fuel is used. Any type of Fuel can be

used .

Efficiency is comparatively

less.

Efficiency is higher.

type of Turbines

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