Describe The Different Types Of Boiler

Different types of boilers working principle of boiler different parts of boilers

A Boiler is a closed container to heat water until it becomes hot water or steam. The heated or vaporized liquid under pressure is then applied in different processes or heating applications, which include water heating , central heating, cooking, and power generation.

The boiler (or evaporator) is a part of the steam generator where phase change liquid to vapour occurs at constant pressure and temperature but the term "boiler" is generally used to mean the entire steam generator. Water being a cheap medium for transferring heat to a process is generally used in a boiler.

Steam generators or boilers can be classified according to the relative flow of products

For small scale requirements, fire tube boilers are suitable. These boilers have certain advantages like (1) it has low first cost (2) its operation is reliable (3) even unskilled labour can handle the operations (4) less drought is required (5) there can be quick response to load changes.

A fire tube boiler is named so because the flue gases flow through the tubes while the water surrounds the tubes. Fire tube boiler can be (A) Externally fired(example- locomotive type boilers, Lancashire boilers, horizontal return tubular boiler) or (B) Internally fired (example- Scotch marine boilers, package boilers, etc.).

Fire tube boilers have certain disadvantages, they are:-

• It takes longer to fill water than to increase temperature and pressure.

• As the heat exchanger does not use thermal radiation the efficiency of heat transfer is bad.

• Due to large amount of hot water and steam being accumulated inside leakage can occur which can be dangerous (boiler explosions).

• Generation of very high pressure of steam is not possible as they are both in the same