Several of these burners were made from ordinary steam pipe fittings without steam nozzle adjustment.
While the burners shown are arranged to give a flat flame (with the exception of burner F) they may all be built for a circular flame by surrounding the injection nozzle with a suitable nozzle. A ROSE or circular flame is particularly desirable for a vertical boiler where it can be made to conform with the circular shell and apply the heat directly to the tube sheet through suitable fire brick baffles.
A burner of the injector type shown by Fig. G, has been used by the Pennsylvania Railroad with a considerable degree of success. The steam enters the steam nozzle at (12) through the circular openings from which point it passes through the nozzle (13) and carries the oil from the air port (14). The mixture or spray of steam and oil passes out of the nozzle (15) into the furnace. The steam nozzle is threaded into the casing at (16), and is keyed to the bevel gear (17). Meshing with (17) is the bevel mounted on the vertical stem which terminates in a hand-wheel in the engineer’s cab. By turning the bevels, the nozzle turns in the casing threads causing it to move back and forth for the adjustment.
In many types of burners having a nozzle similar to (15) a twisted form of rifling is placed in the bore that gives the escaping gas a rotary motion. This is very effective in mixing the air and oil vapor and spreads the flame very close to the orifice. In burners of the chamber type a spiral vane is sometimes used to gain the same effect, and in one make a rotating fan, is placed near the opening of the outer nozzle which gives a sudden whirl to the gases. While this latter attachment does all that is claimed for it while it is in good repair, it is very likely to stick and put the burner out of commission.
The Lassoe-Lovelsin locomotive burner is shown by Fig. H in which the gas exits through a series of holes in the end of the nozzle (22). The steam enters the outside casing, and unlike the burners just described, entirely surrounds the central oil nozzle, (20). The steam in passing through the openings 21–22 draws the oil through the central opening (23), this oil nozzle being controlled by the needle valve (24) which terminates in the handle (25). Oil enters the oil nozzle through the inlet pipe (26).
The Sheedy oil burner shown by Fig. I has a rectangular nozzle for a flat flame, and has no steam nozzle adjustment. Oil surrounds the steam nozzle and enters the casing through the upper connection. Air enters the lower port through the lower opening as shown in the cross-section of the burner. As the oil flows over the trough formed by the steam nozzle it meets the jet of steam at (30) and is atomized. The air from the lower port aids in bringing the combustion near the tip of the nozzle and therefore prevents carbon deposits from being formed in the burner as well as spreading the flame at a wide angle.
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