Steam Boiler

Fire Tube Boiler

In this lesson, we will discuss the types of a steam boiler or we can say the types of boiler.

There are mainly two types of boiler –

Fire-tube boiler and

Water-tube boiler 

  • In a fire tube boiler, there are numbers of tubes through which hot gases are passed and water surrounds these tubes.
  • The Water-tube boiler is the reverse of the fire tube boiler. In the water tube boiler the water is heated inside tubes and hot gasses surround these tubes.

Fire Tube Boiler

  •  As indicated from the name, the fire tube boiler consists of numbers of tubes through which hot gasses are passed.
  • These hot gas tubes are immersed in water, in a closed vessel.
  • Actually in a fire tube boiler one closed vessel or shell contains water, through which hot tubes are passed.
  • These fire tubes or hot gas tubes heated up the water and convert the water into steam and the steam remains in the same vessel.

Reason for not producing high-pressure steam by fire tube boiler.

As the water and steam both are in the same vessel a fire tube boiler cannot produce steam at very high pressure.

Generally, it can produce a maximum of 17.5 kg/cm2 and with a capacity of 9 Metric Ton of steam per hour.

 

fire tube boiler
fire tube boiler

Advantages of Fire Tube Boiler

It is quite compact in construction.

       The fluctuation of steam demand can be met easily.

       It is also quite cheap.

       Disadvantages of Fire Tube Boiler

  •  As the water required for the operation of the boiler is quite large, it requires a long time for rising steam at desired pressure.
  •  As the water and steam are in the same vessel the very high pressure of steam is not possible.
  • The steam received from the fire tube boiler is not very dry.

The construction and working of a fire tube boiler will be discussed in the next lessons

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