A locomotive boiler is a device which is used to create steam from water by using heat energy. It is a horizontal drum axis, multi-tubular, natural circulation, artificial draft, forced circulation, mobile, medium pressure, solid fuel fired fire tube boiler that has an internal fire furnace. It is capable of producing high steam rate and hence it is used for railway locomotive engines and in marines.
Construction of locomotive boiler-
A locomotive boiler comprises of various parts, and going through each part will make us understand the construction of a locomotive boiler. These parts are mentioned below:
1.Fire hole: This hole is used to insert solid fuel and ignite it in the furnace. It is located at the rear end of a boiler.
2.Fire box: In this box, burning of fuel takes place.
3.Grate: It is the platform on which fuel is kept and ignited.
4.Firebrick arch: It is placed over the grate in an inclined position to stop the entry of dust, ash, and burnt fuel particles into fire tubes. It allows the movement of fuel gases in such a way that they move in a definite path before going into the fire tubes of the boiler.
5.Boiler tubes: Through these tubes, hot flue gases pass and exchange the heat with the surrounding.
6.Smokebox: The burnt fuel smoke, after passing through fire tubes, get collected in the smoke box and then released into the environment through the chimney.
7.Blast pipe: It is located above the steam engine and exhaust steam is passed through this pipe. It creates an artificial draft that pushes the smoke out through the chimney. Also, it creates suction for hotter flue gases in order to move forward through the fire tubed.
8.Steampipe: Steam is passed through the steam pipe. There are two types of steam pipes; one is used between superheater and dome which is called as main steam pipe and another is used between superheater end exit and steam engine.
9.Superheater: The steam is superheated with the help of superheater at the desired temperature before entering into the steam engine cylinder.
10.Superheater element pipes: These pipes are present in the superheater through which steam moves and gets superheated.
11.Dome: It is used to regulate the steam generated through the steam pipe. It is located on the top.
12.Regulator valve: During the superheating process, this valve regulates the steam through the main steam pipe.
13.Safety valve: For a safe working steam pressure this valve is used. When pressure is more than the safety level, it blows off and prevents the boiler from blasting.
14.Superheater header: To accept the steam from the steam pipe, superheater header is used.
15.Chimney: To send out the exhaust smoke and gases from the boiler, a chimney is used which has a very small length.