Other Furnaces.
Year: 1885

page_text: Other Furnaces.
We, JAMES SHAW of 19 Bowling Green Street Leith in the County of Midlothian
Builder and NICOL ARTHUR of 11 North Fort Street, Leith, aforesaid Shipbuilder,
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be particularly described and ascertained in and by the following
statement:-
This invention has for its object to feed liquid fuel in the form of a spray to
steam boiler and other furnaces and also to promote draught and combustion in,
and lessen or prevent smoke from such furnaces that part of the apparatus for
promoting draught and combustion and lessening smoke being capable of employ-
ment independently of, or separate from the liquid fuel feeding part when the
invention is adapted to furnaces in which solid fuel is employed.
Figure 1 of the appended drawings illustrates the adaptation of the invention to
a steam boiler furnace in which liquid fuel is consumed and as shewn by the said
figure the apparatus constituting the invention consists of a pipe A, furnished with
a stop cock B, and communicating at its upper end with the steam space C, of the
boiler in which steam is to be raised or the upper end of the said pipe may
communicate with the steam space of a separate boiler. When the boiler has two
or more furnaces the steam pipe A, is branched as seen at figure 2, and in any case
its lower end or ends is or are bent at right or other angles to the main part of the
pipe, the bent portion being inserted through the open end of a wider tube D,
fitted at the front of the furnace and projecting a distance thereinto preferably at
a position immediately below the crown.
The tube D, which communicates with the atmosphere at its outer open end
may as indicated at figure 1, be tapered or as shown at figure 3, and which is the
preferred formation, it may be corrugated or waved in the direction of its length
by twisting it on its longitudinal axis screw wise. As more particularly seen by
the larger detailed views figures 4, and 5, the steam-pipe A, at its nozzle or
discharge end is also twisted screw wise and dented into a form approximately
resembling the figure eight, the effect of the arrangement being that the steam is
discharged in two streams which on account of the twist given to the nozzle are
caused to travel through the tube D, in a spiral or helical path.

page_text: When liquid fuel is employed to fire the boiler another pipe or pipes E, is or are
also inserted through the open end of the tube. D, the discharge end of the said
pipe or pipes E, which is or are preferably flattened to an oval shape as indicated
at figure 6, being in advance of, or inserted further into the tube D, than the
steam tube A, whilst the other end or ends of the pipe or pipes E, is or are
connected to a tank or other source of supply of the fuel, the said fuel on issuing
from the pipe or pipes being by the jets of steam subdivided into a spray which
is also forced in a spiral direction into the furnace where it is ignited and
consumed.
The inducing action of the spiral steam jets draws in air through the open outer
end of the tube D, and it also draws in heated air from the space below the fire
grate or tray F, through the opening G, and through one or a series of holes made
in the tube D, as indicated at a, the effect of all of which is to promote and
support a thorough combustion in the furnace and lessen or prevent smoke
therefrom.
When solid fuel is used in the furnace as with the arrangement shewn at
-figure 3, the apparatus constituting the invention improves the natural draught
through the furnace, heated air being drawn up through the spaces between the
fire bars H, and thence through the openings a in the tube D, and the air after its
.passage through the said tube coming in contact with the gases collected in the
upper part of the furnace ignites them, promotes combustion, and so prevents or
lessens smoke.
In situations where it is necessary to draw off foul air or gases, the open end of
the tube D, may be carried to the space in which these collect or are collected so
as to draw them into and through the furnace by the inducing action of the spiral
.steam jets.
In practising this invention it is preferred to carry the fire bridge I higher than
usual that is to say within seven or eight inches of the furnace crown, the effect of
which is still further to promote combustion.
,
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is
(1.) In conjunction with steam boiler or other furnaces, the combination of
apparatus consisting of the steam pipe A with nozzle or discharge end constructed
to produce separate spiral or helical jets as set forth, the tube D constructed as set
forth, and pipe E, as and for the purposes described.
(2.) In conjunction with steam boiler or other furnaces the combination of
apparatus consisting of the steam pipe A, with discharge nozzle formed as described
and tube D, constructed as described as and for the purposes set forth.
Dated this Fourteenth day of November 1885.