Water-tube boiler - WikipediaA high pressure watertube boiler  also spelled water-tube and water tube is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace , creating hot gas which heats water in the steam-generating tubes. In smaller boilers, additional generating tubes are separate in the furnace, while larger utility boilers rely on the water-filled tubes that make up the walls of the furnace to generate steam. The heated water then rises into the steam drum. Here, saturated steam is drawn off the top of the drum. In some services, the steam will reenter the furnace through a superheater to become superheated. Superheated steam is defined as steam that is heated above the boiling point at a given pressure.
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A boiler is a closed vessel in which fluid generally water is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications,   including water heating , central heating , boiler-based power generation , cooking , and sanitation. In a fossil fuel power plant using a steam cycle for power generation, the primary heat source will be combustion of coal , oil , or natural gas. In some cases byproduct fuel such as the carbon-monoxide rich offgasses of a coke battery can be burned to heat a boiler; biofuels such as bagasse , where economically available, can also be used. In a nuclear power plant, boilers called steam generators are heated by the heat produced by nuclear fission.