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English: HMS Belfast, diagram of the boiler. The water comes (8), and goes into pipes (9). Warmed by the combustion of the fuel (came in 3), steam bubbles forming in these pipes, and arrives in the drum (7). Then steam goes (through 6) in smaller pipes (10) and being superheated here. At last, superheated steam goes to engine room (5).
A steam boiler evaporates liquid water to form steam, or gaseous water, and requires frequent replenishment of boiler feedwater for the continuous production of steam required by most boiler applications. Water is a capable solvent, and will dissolve small amounts of solids from piping and containers including the boiler. Continuing evaporation ...
Fire-tube boilers usually have a comparatively low rate of steam production, but high steam storage capacity. Fire-tube boilers mostly burn solid fuels, but are readily adaptable to those of the liquid or gas variety. Fire-tube boilers may also be referred to as "scotch-marine" or "marine" type boilers. [7] Diagram of a water-tube boiler.
Sections of a steam locomotive showing the many fire-tubes which carry the hot gases of the fire through the boiler to heat the water and so create steam. Boiler design is the process of designing boilers used for various purposes. The main function of a boiler is to heat water to generate steam.
Boiler feedwater is the water which is supplied to a boiler. The feed water is put into the steam drum from a feed pump. In the steam drum the feed water is then turned into steam from the heat. After the steam is used, it is then dumped to the main condenser. From the condenser, it is then pumped to the deaerated feed tank.
Usually the lower part of the water drums were exposed outside the casing, but only the ends of the steam drum emerged. The water level was at around one-third of the steam drum diameter, enough to cover the ends of the submerged water-tubes. The weight of the boiler rested on the water drums, and thus on supports from the firing flat's deck.
To avoid the problem of exposed fire-tubes above the water level, the submerged multi-tube boiler may be used. The upper boiler shell is extended upwards in an annular ring, so as to always maintain the whole length of the tubes submerged. Used in steam wagons and similar, where the water-level may be disturbed as the vehicle climbs a hill.
Water boils off in the water drums shared by a common header, then sent up the generating tubes, into the steam drum and up the dry pipe. Just like the D-type package boiler, fire heats the tubes surroundings causing the tubes to increase in temperature thus boiling off water molecules to steam.