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If the engine burns solid fuel, like wood or coal, there is a grate covering most of the bottom of the firebox to hold the fire. An ashpan, mounted underneath the firebox and below the grates, catches and collects hot embers, ashes, and other solid combustion waste as it falls through the grates.
The Wootten firebox is a type of firebox used on steam locomotives. The firebox was very wide to allow combustion of anthracite waste, known as "culm". [1] Its size necessitated unusual placement of the crew, examples being camelback locomotives. The Wootten firebox made for a free-steaming, powerful locomotive, and the cheap fuel burned almost ...
This used a system of paddles to push coal forward and it was fed into the firebox at grate level. [5] The Street type, consisted of a coal crusher, hand-fed by the fireman, that was fitted to the front left hand side of the tender footplate and driven by a small steam engine mounted behind the hand brake column. The crushed coal then fell by ...
Heywood-designed Ursula at the Perrygrove Railway, showing the limited grate and ashpan size. A limitation of this design for steam locomotives was the need to fit fire, grate and ashpan all within the confined circular furnace tube. This limited the radiative heating surface of the furnace, and thus the immediate steam-raising power of the boiler.
It is standard equipment on large stationary boilers and was also fitted to large steam locomotives to ease the burden of the fireman. The locomotive type has a screw conveyor (driven by an auxiliary steam engine) which feeds the coal into the firebox. The coal is then distributed across the grate by steam jets, controlled by the fireman.
The steam is ejected through the chimney, again drawing the fire. The blastpipe is what produces the characteristic "chuff" sound. The dimensions of the blastpipe and chimney are critical to the steam-generating capacity of the locomotive and its fuel economy, since there is a natural trade-off between a high-velocity steam jet giving a strong ...