What is boiler, types of boiler,how do boiler work, definition of boiler, boiler classification,steamboiler

Introduction:

           Hii,in this blog we will discuss about what is boiler, how the boiler work, type of boiler, classification of boiler,steam generation etc

Working Process:

The boiler is the biggest and the most

critical part of a thermal power plant.

In this blog we will learn about the

operation and construction of a typical

power plant boiler.

we will also clarify a popular misconception associated with

boiler operation near the end of the

Blog the function of the boiler is to

convert energy contained in the coal

into high temperature steam large power

plants.

Typically there is so many type of boiler

called a water tube boiler where water

flows through the tubes and fire

surrounds it water-tube boilers are

ideal for high pressure applications.

There are also fire tube boilers but

they are used for small-scale

applications.

Burners in the boiler convert chemical

energy in the pulverized coal into

thermal energy.

The hot gas that is produced travels all

over the boiler.

The first heat absorption unit of the

boiler is an economizer highly

pressurized water supplied by the feed

water pump enters here

The economizer absorbs energy from the

flue gas which raises the temperature of

the liquid.

from there the water flows into a steam

drum to the down comer it then passes

through a narrow tube section called a

water wall the phase change of the water

happens in the water wall.

The steam that is produced in addition

to some water droplets enters the steam

drum again the real function of the

steam drum it is to separate the water

droplets from the steam.

as a result the steam leaving the steam

drum is saturated and pure

now here are some thermodynamics facts.

according to the second law of

thermodynamics the greater the

temperature of the heat source the more

efficient the cycle.

therefore making the steam temperature

very high will result in a highly

efficient power plant, but this

temperature increase has certain

limitations the steam turbine blade

material cannot withstand temperatures

greater than 600 c.

so one more heat exchanger is added

after the steam drum to superheat the

steam and it is heated to the maximum

allowable limit.

superheating also reduces the moisture

content in the steam he steam is then supplied to the turbine inlet.

After the first turbine stage the

temperature drops.

a clever idea to increase the power

plant efficiency is to bypass the steam

completely after the first stage and add

more heat this process is known as

reheating a heat exchanger known as a

reheater is used for this purpose

reheating and superheating also increase

the power plant capacity along with the

efficiency.

now let's discuss an important

misconception about boilers:

we know that the temperature rises

across the boiler but what about

pressure.

consider this droplet of water assume it

is surrounded by a cover if it gets

converted to steam obviously the

pressure will rise

now consider the same droplet with no

cover.

here if the liquid gets converted

to steam the pressure will remain the

same because the fluid does not have a

fixed volume here it is free to expand.

water inside the boiler is also like the

water droplet without a cover it's an

open flowing system the water is free to

expand when the liquid is converted into

steam which means that the pressure

should remain the same throughout an

ideal boiler in actual practice due to

friction and other irregularities.

small drop in pressure occurs across the

boiler save learn engineering please see my other interesting blog related to engineering.