Fire tube boiler diagram. The high pressure steam for a steam engine comes from a boiler. The most basic type of a package boiler is single passage three pass design. The furnaceflame volume can either be inside or external to the shell that contains the water. Hurst scotch marine boilers are rated to 81 minimum efficiency.
It was popular in 18 th century. One such boiler is shown in the figure. A 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. The fire tube boiler the oldest design is made so the products of combustion pass through tubes surrounded by water in a shell.
The boiler consists of a shell a tube sheet on each end of the shell and tubes connecting the two tube sheets. Fire tube and water tube. The boilers job is to apply heat to water to create steam. Most of the fire tube boilers now come in a complete packagethe main parts of the package are.
Fire tube boiler is the simplest form of the internal furnace vertical fire tube boiler. It was mainly used for steam locomotive engines. A fire tube boiler is a type of boiler in which hot gases pass from a fire through one or many more tubes running through a sealed container of water. The heat of the gases is transferred through the walls of the tubes by thermal conduction heating the water and ultimately creating steam.
Fire tube boiler is one of the most basic types of boiler and the design is also very old. There are two approaches. The boiler is mounted above a steel or masonry furnace. The products of combustion leave the furnace and are directed through the tubes at one end of the boiler.
Our two pass three pass or four pass scotch marinefire tube boilers are available in dryback wetback steam or hot water versions. Fuel is burned inside the furnace creating hot gas which heats water in the steam generating tubes. Types of firetube boilers. The boilers job is to apply heat to water to create steam.
Fire tube boiler hef type three pass fire tube boilers assure continuous operation at 15 of turn down ratio and still maintain boiler efficiency as high as 8890.