Today we are going to study a very important article. This article discusses the overview of Fire Tube Boilers, Components, and Types for SSC JE, RRB JE, State Level Engineering Exams, Gate. We have also shared Some of the Previous Year questions that are asked from topic Boilers in SSC JE, GATE, RRB JE, and various other engineering exams.
The purpose of Fire Tube Boilers is to transmit hot-gases using a heat source as well as a cycle. These gases flow from pipes with drums filled with water. This process efficiently transports heat from hot gas to water, which efficiently produces steam. The main features of fire tube boilers include a simple design, easy to operate as well as low cost of purchase. These boilers are extremely flexible in producing less than average degree of capacity as well as being efficient to be arranged in various designs.
What is a Fire Tube Boiler?
These are one of the most original and old designed boilers. These boilers are very well known in the 18th century and are particularly applicable to train engines. In such boilers, heat combustion, as well as gases, flows through pipes enclosed by water. These boilers can be high pressure or low-pressure boilers. These boilers can always be measured along with their outer diameter. Typically, the pressure of these boilers is at a maximum of 250 psi and around 750 horsepower.
Read about Steam Boiler - Working Principle, Types and Advantages here Steam Boiler
Fire Tube Boiler Construction and Working Principle
Water-tube boilers can be constructed with a cylindrical shell, vertical, firebox in the base, space for water in the center segment, and space for steam in the higher section. Fire-grate is located at the base of the fire-box, as well as coal is fired at the firebox. For burnt coal, ash is kept in ash pits to collect ash from burnt coal, and sometimes it can be separated.
One or several cross-tubes are trapped in a place of water which is placed within the box to increase the external area of heating to improve the flow of water. A small chimney attaches to the crest of the firebox to release the waste outlet to some larger elevation. The boiler can be cleaned by hand holes as well as by the boiler's tube and shell manhole.
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| Fire Tube Boilers - Construction, Working Principle and Types |
These boilers include a water level indicator; Simplicity of work such as a pressure gauge, steam stop tap security tap, and manhole mounting to provide protection. The fuel burns on the grid of the firebox in the boiler and allows the resulting hot-flow gases to flow over the area of the cross tube.
The water near the cylindrical type firebox is heated by radiation as well as convection, so steam will be generated. The flow of water in the boiler will be based on the difference in density within the water formed with the temperature difference.
Types of Fire Tube Boilers
The different types of this boiler include the following.
Cornish Fire Tube Boiler
The first Cornish boiler was approved by an engineer named "Trevithick a Cornish". Such boilers include an aircraft cylindrical shell, as well as a small flue pipe holding the heating system flowing through it.
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| Cornish Fire Tube Boiler |
Lancashire Fire Tube Boiler
The construction of the Lancashire boiler is related to the Cornish boiler, but as an alternative to a flue pipe, two flue pipes are used.
Locomotive Fire Tube Boiler
The locomotive boiler is a passive boiler used in a train engine. This type of boiler is capable of producing steam as well as being solid. The design of the locomotive boiler is horizontal multi tubular. The main advantage of using this type of boiler is the low cost for construction, installation, and steam capacity.
Vertical Fire Tube Boiler
The vertical boiler is a simple boiler and consists of a cylindrical shell that engages a large portion of water and the rest of the part will be occupied with steam. It consists of a cross tube and a furnace under the boiler. After heating the water, the combustion gases are allowed to escape into the atmosphere.
Cochran Fire Tube Boiler
The Cochran boiler is a vertical type of multi-tubular boiler and includes several horizontal fire tubes. The heating system is a part of the construction and is perfect.
Scotch Marine Fire Tube Boiler
Scotch marine boiler is a very popular boiler used for high vapor capacity at high forces. This type of boiler includes a large number of small diameter tubes to provide the advantage of a high-heating area of the surface. Boilers are fired internally and released from the boiler to the atmosphere using a chimney.
Immersion Fire Tube Boiler
The immersion type boiler is a single flow boiler which was expanded in the year 1940 by Sellers Engineering. It includes only the fire tube, serves as a boiler as well as a burning chamber. Needles with premixed air and normal gas under pressure, by several burners. It maintains a thick thermal pressure and requires complete brickwork due to its construction.
Advantages and Disadvantages of Fire Tube Boilers
The advantages of Fire Tube Boilers include the following.
- The design of this boiler is simple and low maintenance value.
- It is applicable to small scale industries.
- Fewer specialists are sufficient for operation.
- No pure water is necessary.
- Treatment of feed water is not very necessary.
The disadvantages of Fire Tube Boilers include the following.
- The efficiency of this boiler is up to 75%.
- The load cannot vary.
- It occupies more floor area.
- The working pressure of this boiler is a maximum of 20 bar.
- It is not easy to deal with load fluctuations.
Thus, it is about the Fire Tube Boilers design and its variants. The applications of Fire Tube Boilers are mainly included marines, railways, plants, and industries.
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