Steam goes from top side to superheater & water goes from the bottom through down comer Mud drum, then to furnace bottom ring headers (bottom of furnace water wall). Steam drum is a collection vessel for steam & water. There are many pressure parts and non pressure parts in a water tube boiler we only discuss main water tube boiler parts and function. Water tube boiler parts and their functions Most boilers, however, are built in sections and erected on the site. Low-pressure steam leaving the turbine would then be used for the process.The smaller water tube boilers can be built at the manufacturers and delivered to site as one unit package water tube boiler. Steam generated at high pressure and superheated would be fed to a turbine driving an alternator to generate electricity. These boilers were common in the paper making, sugar and other Industries which had big demands for electrical power and steam. Pre heated (economiser) Feed water is continually feed in the steam drum with feed water pump. Water inside the tubes become hot and due to natural circulation steam is collected and separated in the steam drum. At the end of the furnace, the flue gas turns into the convection section and travels towards the stack.Īll boilers have a radiant and a conviction sections, tubes around the furnace are called generation or riser tubes about a half of steam is generated in this area rest of the steam is produced in the convection section. Sheet metal and refractory enclosing the boiler called casing. In a water tube boiler fuel is fired into a water cooled furnace. There was also a spring loaded safety valve on top of the steam drum. The tubes were inclined to promote water circulation.

The rear header was connected to a horizontal box header, which was also attached to the steam drum. On this design straight tubes were rolled into mud drum, and the front headers were connected to the steam drum. In a typical Water tube boiler design as shown in the figure, it consists of two drums the steam drum and the water or mud drum. flue gases produced from furnace where fuel is burnt. Where as in fire tube boilers hot gases from combustion travels through the tubes. In the water tube boiler, the water and steam flow inside the tubes and the hot gases flow over the outside surfaces.

We briefly discuss about Water tube boiler parts and functions. these types of boilers have quicker response to load changes. Water tube boilers were developed for a variety of reasons, including the need for higher steam pressures, higher steam generation rate, superheated steam.

Steam Turbine Diagram with Parts