The quantity of
cooling water required to cool the steam in a thermal power plant layout is
significantly high and hence it is supplied from a natural water source like a
lake or a river. After passing through screens that remove particles that can
plug the condenser tubes in a thermal power plant layout, it is passed through
the condenser where the steam is condensed. The water is finally discharged
back into the water source after cooling. Cooling water circuit can also be a
closed system where the cooled water is sent through cooling towers for re-use
in the power plant. The cooling water circulation in the condenser of a thermal
power plant layout helps in maintaining a low pressure in the condenser all
throughout. All these circuits are integrated to form a thermal power plant layout that
generates electricity to meet our needs.
Monday, 14 December 2015
What is meant by Feed Water and Steam Circuit?
The steam produced in
the boiler is supplied to the turbines to generate power. The steam that is
expelled by the prime mover in the thermal power plant layout is then condensed
in a condenser for re-use in the boiler. The condensed water is forced through
a pump into the feed water heaters where it is heated using the steam from
different points in the turbine. To make up for the lost steam and water while
passing through the various components of the thermal power plant layout, feed
water is supplied through external sources. Feed water is purified in a
purifying plant to reduce the dissolve salts that could scale the boiler tubes.
What is meant by Air and Gas Circuit?
Air from the
atmosphere is directed into the furnace through the air preheated by the action
of a forced draught fan or induced draught fan. The dust from the air is
removed before it enters the combustion chamber of the thermal power plant
layout. The exhaust gases from the combustion heat the air, which goes through
a heat exchanger and is finally let off into the environment.
What is meant by Coal and Ash Circuit?
Coal and Ash circuit
in a thermal power plant layout mainly takes care of feeding the boiler with
coal from the storage for combustion. The ash that is generated during combustion
is collected at the back of the boiler and removed to the ash storage by scrapconveyors. The combustion in the Coal and Ash circuit is controlled by
regulating the speed and the quality of coal entering the grate and the damper
openings.
Main circuits of thermal power plant ?
The four main circuits one would come across in any thermal power plant layout are
-Coal and Ash Circuit
-Air and Gas Circuit
- Feed Water and Steam Circuit
- Cooling Water Circuit
What is meant by STEAM POWER PLANT?
A thermal power station
is a power plant
in which the prime mover is steam driven. 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 and recycled to where it was heated;
this is known as a Rankine cycle. The greatest variation in the
design of thermal power stations is due to the different fuel sources. Some
prefer to use the term energy center because such facilities convert
forms of heat
energy
into electricity. Some thermal power plants also deliver heat energy for
industrial purposes, for district heating, or for desalination
of water as well as delivering electrical power. A large proportion of CO2
is produced by the worlds fossil fired thermal power plants; efforts to reduce
these outputs are various and widespread.
Sunday, 13 December 2015
PURPOSE OF HEAT EXCHANGER?
Suppose you have a gas central heating furnace (boiler) that heats hot-water radiators in various rooms in your home. It works by burning natural gas, making a line or grid of hot gas jets that fire upward over water flowing through a network of pipes. As the water pumps through the pipes, it absorbs the heat energy and heats up. This arrangement is what we mean by a heat exchanger: the gas jets cool down and the water heats up.
A heat exchanger is a device that allows heat from a fluid (a liquid or a gas) to pass to a second fluid (another liquid or gas) without the two fluids having to mix together or come into direct contact. If that's not completely clear, consider this. In theory, we could get the heat from the gas jets just by throwing cold water onto them, but then the flames would go out! The essential principle of a heat exchanger is that it transfers the heat without transferring the fluid that carries the heat.
heat exchanger is a device used to transfer heat between one or more fluids. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact.They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural-gas processing, and sewage treatment. The classic example of a heat exchanger is found in an internal combustion engine in which a circulating fluid known as engine coolant flows through radiator coils andair flows past the coils, which cools the coolant and heats the incoming air.
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