Trevithick's engine of 1806 is built around an early example of a flued boiler (specifically, a return-flue type)
A shell or flued boiler is an early and relatively simple form of boiler used to make steam, usually for the purpose of driving a steam engine. The design marked a transitional stage in boiler development, between the early haystack boilers and the later multi-tube fire-tube boilers. A flued boiler is characterized by a large cylindrical boiler shell forming a tank of water, traversed by one or more large flues containing the furnace. These boilers appeared around the start of the 19th century and some forms remain in service today. Although mostly used for static steam plants, some were used in early steam vehicles, railway locomotives and ships.
Flued boilers were developed in an attempt to raise steam pressures and improve engine efficiency. Early haystack designs of Watt's day were mechanically weak and often presented an unsupported flat surface to the fire. Boiler explosions, usually beginning with failure of this firebox plate, were common. It was known that an arched structure was stronger than a flat plate and so a large circular flue tube was placed inside the boiler shell. The fire itself was on an iron grating placed across this flue, with a shallow ashpan beneath to collect the non-combustible residue. This had the additional advantage of wrapping the heating surface closely around the furnace, but that was a secondary benefit.
Although considered as low-pressure (perhaps 25 psi (1.7 atm)) today, this was regarded as high pressure compared to its predecessors. This increase in pressure was a major factor in making locomotives (i.e. small self-moving vehicles) such as Trevithick's into a practical proposition.
A shell or fluedboiler is an early and relatively simple form of boiler used to make steam, usually for the purpose of driving a steam engine. The design...
low. Fluedboiler With one or two large flues—an early type or forerunner of fire-tube boiler. Fire-tube boiler Here, water partially fills a boiler barrel...
centuries ago had flues. Another use of the term is for the internal flues of a fluedboiler. Flue types include: Open flue – An open flued appliance draws...
There have been a vast number of designs of steam boiler, particularly towards the end of the 19th century when the technology was evolving rapidly. A...
steam Flue A large fire tube, either used as the main heating surface in a fluedboiler, or used as enlarged firetubes in a locomotive-style boiler where...
cylindrical boiler shell similar to his earlier return-flued 'Royal George' , but with the return flue replaced by a number of small firetubes, as had been...
double-walled and forms a water jacket around the boiler, with a large vertical flue within. The inner flue has a complex cross section. It is stepped in...
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boiler or steam generator. It often refers to the exhaust gas of combustion at power plants. Technology is available to remove pollutants from flue gas...
in flue gases has more than 60 years of practice. One should also note square headers in the 1940 recovery boiler. The air levels in recovery boilers soon...
high-pressure boilers were a large drum with a central flue, such as the Cornish and Lancashire boilers. Simple tubes were inserted across this flue. Thermosiphon...
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temperature gaskets. Electric arc furnace Fluedboiler Fire test furnaces European Conference on Industrial Furnaces and Boilers International Flame Research Foundation...
A thimble tube boiler is a form of steam boiler, usually provided as an auxiliary boiler or heat-recovery boiler. They are vertical in orientation and...
against excessive boiler pressure. The air and flue gas path equipment include: forced draft (FD) fan, air preheater (AP), boiler furnace, induced draft...
during combustion, which also allows more efficient heat transfer from the boiler to the apparatus used to capture the heat energy (usually water tubes)....
would soon be superseded following the development of the cylindrical fluedboiler. The marine analogue of the beam engine being termed the 'lever engine'...
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