The basic definition of a fire tube boiler that an industrial boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water.A fire tube boiler also spelled as fire-tube boiler and firetube boiler.
the heat of the gases is transferred through the walls of the tubes by thermal conduction, heating the water and ultimately creating hot water.Fire tube boilers consist of a series of straight tubes that are housed inside a water-filled outer shell. The tubes are arranged so that hot combustion gases flow through the tubes. As the hot gases flow through the tubes, they heat the water surrounding the tubes. The water is confined by the outer shell of boiler. To avoid the need for a thick outer shell fire tube boilers are used for lower pressure applications. Generally, the heat input capacities for fire tube boilers are limited to 50 mbtu per hour or less, but in recent years the size of fire tube boilers has increased.
Fire tube boilers are subdivided into three groups. Horizontal return tubular boilers typically have horizontal, self-contained fire tubes with a separate combustion chamber. The fire-tube boiler developed as the third of the four major historical types of boilers:low-pressure tank or "haystack" boilers, flued boilers with one or two large flues, fire-tube boilers with many small tubes, and high-pressure water-tube boilers. Their advantage over flued boilers with a single large fuel is that the many small tubes offer far greater heating surface area for the same overall boiler volume. The general construction is as a tank of water penetrated by tubes that carry the hot flue gases from the fire.
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