How are fire tube boilers fired?

A fire-tube boiler is a type of boiler in which hot gases pass from a fire through one or more tubes running through a sealed container of water. The heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating steam.

Are water tube boilers internally fired?

Water Tube Boiler: In this boiler, the water is present inside the tubes and the hot flue gases surround them. They are high-pressure boilers and the operating pressure is about 250 bar. Water-tube boilers are always externally fired.

Which is the internally fired boiler?

Examples: Stirling boiler, Babcock & Wilcox Boiler. Internally fired boiler: furnace integral to part of the structure of boilers (located inside). Cochran, Lancashire and boilers of locomotives are well-known examples.

What is the difference between a fire tube and water tube boiler?

The firetube boiler passes combustion gas inside a series of tubes surrounded by water in a vessel to produce steam, while a watertube instead sends water through a series of tubes surrounded by combustion gas used to transfer heat energy and produce steam.

Which boiler is not a fire tube boiler?

Cochran; Lancashire; Locomotive; Babcock and Wilcox. (Ans:d). The following are the water tube boilers except. Fire-tube boiler – WikipediaAs these are short tubes of large diameter and the boiler continues to use a relatively low pressure, this is still not considered to be a water-tube boiler.

Why are fire tube boilers not suitable for high pressures?

The fire tubes are immersed in water inside the main vessel of the boiler. As the hot gases are passed through these tubes, the heat energy of the gasses is transferred to the water surrounds them. As the steam and water is stored is the same vessel, it is quite difficult to produce very high pressure steam from.

Which of the following is not a fire tube boiler?

Is locomotive boiler a water tube boiler?

Locomotive boiler is a water tube boiler. Water tube boilers are internally fired. La-mont boiler is a low pressure water tube boiler.

What is difference between externally fired and internally fired boilers?

In the case of externally fired boilers, the combustion of fuel takes place in chamber outside the boiler shell while in case of internally fired boilers, the combustion chamber is provided inside the shell.

On what basis are internally and externally fired boilers classified?

Clarification: Boilers are classified as high and low pressure boilers on the basis of pressure, internally fired and externally fired on the basis of method of firing, water tube and fire tube on the basis of relative position of hot gases and water and as horizontal, vertical and inclined on the basis of their axis.

What is meant by fire tube boiler?

Definition of fire-tube boiler : a boiler in which water surrounds the tubes through which hot gases pass from the furnace to the stack.

What is the difference between water tube boiler and fire tube boiler?

In Fire Tube Boilers, hot flue gases will be flown inside the tube and these tubes are surrounded by water. These are the low-pressure boiler which cannot generate much heat compared to water tube boilers. As the production of heat is less the overall efficiency of this boiler is also low.

How does a locomotive fire tube boiler work?

The working of the Locomotive fire tube boiler is shown in the figure below. The heat of flue gases gets transmitted to the water surrounded. The heated water gets evaporated and converted into steam which is collected in the hemispherical shell. It requires more space.

How many pumps does a fire tube boiler need?

Fire-tube boilers can handle a wide range of capacity through them. By using just one set of variable speed pumps to serve our boilers and terminal units we have created what is called a Variable Primary System.

What is the pressure of a internal fired boiler?

These boilers are almost always internally fired. The furnace is placed at the one end of the fire tube. Typically have lower pressure drops in the range of 2-15 ft. H2O, depending on size and flow rate. Typically have higher pressure drops in the range of 10-30 ft. H2O, depending on size and flow rate.