fire-tube boiler : Quick Return Mechanism: Definition, Types, Working Principle, Applications, Advantages, Disadvantages [Notes with PDF] -

Quick Return Mechanism: Definition, Types, Working Principle, Applications, Advantages, Disadvantages [Notes with PDF]

Locomotive Boiler is an external fire boiler. It has a large fire space, horizontal drum axis and It is a multi-tube boiler. It is also a portable type of Boiler.

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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. The figure which depicts the fire tube boiler is shown below.

Later development in boiler is Galloway tubes, crosswise flue water tubes, thereby increasing the heated surface area.

Fire-tube boiler — noun : a boiler in which water surrounds the tubes through which hot gases pass from the furnace to the stack * * * /fuyeur toohb , tyoohb / any boiler for generating steam by passing hot gases and other combustible products through tubes (fire… …   Useful english dictionary

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 water.

4.This boiler occupies more floor space for output, while in water tube boiler,require less floor area.

9.The design of the fire tube is simple, easy to install, and the maintenance price is low, while the design of the water tube is complicated, not easy to instal, and the maintenance price is high.

The Cochran Boiler is a modified version of a basic vertical boiler with different fire tubes that can exchange heat by convection to water.The efficiency of this boiler is much higher than the efficiency of simple vertical boiler.

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Usually this will be designed by a mechanical engineer and is typically set somewhere in between 20ºF and 60ºF.

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A fire-tube can also be the better solution if you are designing a system with only one set of variable speed pumps in mind.

This steam is then taken out from the steam outlet for utilizing for required purpose. The water is fed into the boiler through the feed water inlet. As the steam and water is stored is the same vessel, it is quite difficult to produce very high pressure steam from. General maximum capacity of this type of boiler is 17.5 kg/cm2 and with a capacity of 9 Metric Ton of steam per hour. In a fire tube boiler, the main boiler vessel is under pressure, so if this vessel is burst there will be a possibility of major accident due to this explosion.

The main differences between the fire tube and the water tube boiler are the hot gases flow inside the tube and water surround them in the fire tube boiler whereas, In the water tube, water flows inside the tube and Hot gases surround them.

It is a vertical, multi-tubular, internally fired, and naturally circulated type boiler. The shell of this type of boiler is arranged in the vertical direction that has multi tubes. These multi tubes arranged in vertical and the high pressurized flue gases will be passed through them. These tubes are surrounded by water and will be heated by the hot flue gases passed through the tubes. The combustion process takes when the hot flue gases are passed through the tubes that heat the surrounding water. The heated water beyond its temperature limits will be converted to steam that is further used for the production of electricity. This combustion process takes place is of internally fired and water circulated naturally.

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The fuels (normally coal) burnt in the furnace and combustible gasses move into the fire tubes, travel through these tubes from rear to front of the boiler drum and finally the gases come into the smoke box. The hot gasses in the tubes under water transfer heat to the water via the tube walls. Due to this heat energy steam bubbles are created and come upon the water surface. As the amount of steam is increased in that closed drum, steam pressure inside the drum increases which increase significantly the boiling temperature of the water and hence rate of production of steam is reduced. In this way a fire tube boiler controls its own pressure. In other words this is a self pressure controlled boiler.