Question

Write briefly the work of steam turbine

Answer 1

A steam turbine is a device that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft. Its modern manifestation was invented by Sir Charles Parsons in 1884.

Because the turbine generates rotary motion, it is particularly suited to be used to drive an electrical generator—about 85% of all electricity generation in the United States in the year 2014 was by use of steam turbines.The steam turbine is a form of heat enginethat derives much of its improvement in thermodynamic efficiency from the use of multiple stages in the expansion of the steam, which results in a closer approach to the ideal reversible expansion process.

Answer 2

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How a Steam Turbine Works



A steam turbine generator works by heating water to extremely high temperatures until it is converted into steam, then the steam energy is used to rotate the blades of a turbine to create mechanical or rotational energy.

This rotational energy caused by the high pressured steam turbine is used to generate electricity from an attached generator.

This video fully explains the diagram below, or read the step-by-step tutorial on how a steam turbine works:

In the diagram below we see a simplified example of how a steam energy turbine works. Here is a simple step by step guide:

(1)  A heat source of some sort — perhaps a combusted fossil fuel or solar heat — is used to create heat energy.

(2)  The boiler, which contains water, uses the heat energy to convert the water into high pressure steam.

 

 

(3)  If the system is using a combustible fossil fuel as a heat source, then an exhaust pipe is needed to release the pollutants.  If the system uses solar energy for the heat conversion, then an exhaust pipe is not needed because the solar energy system will not release any pollutants.

(4)  The steam from the water in the boiler is pumped into the steam turbine.  The steam energy spins the turbine blades.

(5)  The generator is attached to the steam turbine by a rotating shaft.  As the steam turbine spins, the generator spins and creates electricity.

(6) The steam that uses it’s energy to spin the turbine passes through and is cooled using a cooling tower. The steam could alternatively be cooled naturally, perhaps using a lake or river,

(7) The cooling tower releases the already used, lower energy, and cooled steam into the atmosphere.  The remaining water that is cooled back into a liquid state is pumped back into the boiler and repeats the process again, creating more energy from steam.

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