Steam Boiler

Construction of fire tube boiler

In this lesson, we will discuss the construction of a fire tube boiler.

Construction of fire tube boiler

  • Fire-tube boiler consists of a vertical, cylindrical shell, equipped with a firebox in the bottom, water space in the middle portion and steam space in the upper portion. The fire grate is placed at the bottom of the firebox and coal is fired at the firebox. An ash pit is located at the bottom of the grate to collect the ash of burnt coal, which is periodically removed.
  •   One or more cross tubes are either flanged or riveted to the water space are located in the firebox to increase the heating surface area to improve the water circulation. A short chimney is connected at the top of the firebox to discharge the waste flue exhaust gases at some greater height. Manhole and hand holes are provided for cleaning the interior of the boiler shell and cross tubes.
  • The boiler consists of a pressure gauge, water level indicator, safety valve, steam stop valve, and a manhole as mountings to provide safety and ease of working.

fire tube boiler
fire tube boiler

 

 

 

 

Working:

      Fuel burns on the grate in the firebox. The resulting hot flue gases are allowed to pass around the cross tubes. The water surrounding the cylindrical firebox also receives heat by convection and radiation. Thus steam is produced. The water circulation in the boiler depends on the density difference in water, created by the temperature difference in the water.

fire tube boiler working
fire tube boiler working
  •  Heat is a form of energy that transfers between bodies which are kept under thermal interactions.
  • When a temperature difference occurs between two bodies or a body with its surroundings, heat transfer occurs.

Modes of heat transfer in a fire tube boiler will be discussed in the next lesson.

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