appertaining to or Improvements in Steam Boiler or other Furnaces and Flues, and in Apparatus connected therewith.
Year: 1894

page_text: Date of Application, 28th May, 1894
Complete Specification Left, 13th Nov., 1894-Accepted, 24th Nov., 1894
PROVISIONAL SPECIFICATION.
appertaining to
or
Improvements in
Steam Boiler or other
Furnaces and Flues, and in Apparatus connected therewith.
I, GEORGE ALEXANDER NEWTON of 7 and 9 Clyde Street, Derby Road,
Liverpool in the County of Lancaster, Engineer, do hereby declare the nature of
this invention to be as follows:--
This invention relates to steam boiler or other furnaces and flues and is designed
to obtain more perfect combustion and a greatly increased economy in fuel.
Moreover I am enabled to keep the combustion under control, and obtain a perfect
absence of smoke.
Another
In carrying my invention into effect as applied to steam boiler furnaces, we run
one or more draught pipes for air along the bottom of the flue under the fire-bars.
One of these pipes communicates with the fire-bridge which is preferably formed
hollow or provided with a long chamber lying along the top, with perforations or
slots, out of which issue the air jets at any convenient angle into the fire.
draught pipe may be also arranged in the flue under the fire-bars, but the latter
stops short of the bridge. Each pipe is provided with steam jets for inducing a
current of air through the pipes, and these jets are arranged annularly or at
intervals round the inside of the pipe, each jet being supplied by branches from
one central pipe. The supply to the jets is regulated by a cock or other hand
regulator and thus the induced air currents can be regulated to a nicety. The
front of the flue under the fire-bars is covered so as to prevent the passage of air
except through the draught tubes.
The mode of action is as follows
The induced air current through one of the pipes is, as already stated, delivered
at the furnace bridge, and supplies the necessary amount of oxygen which is
essential to complete combustion of the smoke, at a point where the air supply has
in many cases hitherto been deficient. The air from the other pipe impinges
against the bridge, and passes upwards through the bars into the hottest part of
the fire where an adequate amount of oxygen for combustion is also most important.
The attendant in charge of the boiler can at once increase or decrease the induced
air current by regulating the steam jets, and thus the draught can be regulated to
a nicety. By this invention the smoke is not only burnt but the combustion is
greatly intensified. The heat also raised in much shorter period than by existing
arrangements and large economy in fuel is effected.
Dated this 25th day of May 1894.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or appertaining to Steam Boiler
or other
Furnaces and Flues, and in Apparatus connected therewith.
I, GEORGE ALEXANDER NEWTON of 7 and 9 Clyde Street, Derby Road,
Liverpool in the County of Lancaster, Engineer, 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 relates to steam boiler or other furnaces and flues, and is designed

page_text: Figure 4 plan of part shown in Figure 2;
Figure 5 enlarged view of jet ;`
Figure 6 enlarged view of air inlet ;
Figure 7 a modification showing the top bricks of the furnace which I sometimes
make in one single piece as therein shown, extending right across the bridge,
instead of being built up as set forth in Figure 2. Figure 3 correctly shows the
front view of both forms of brick.
Figures 8 and 9 show the crown of jets applied to driving air into the furnace
above the bars.
In thus showing my apparatus applied to a two flued boiler, I do not wish at all
to confine it thereto as it is equally applicable for almost all furnaces.
In these drawings, A A are two pipes each leading from the steam space of the
boiler or other source of steam supply to a single jet or a crown of jets somewhat
similar to Figure 5 drawing the air into pipes B, Figure 2, and thus through the
.bridge D and out at the outlets C behind the bridge so as to induce a very strong
draught. E E two pipes from the steam chamber of the boiler, each leading to a ring
of jets F set forth in detail, Figure 5, and placed at the front of the air entrance
pipe G.
This pipe projects into the ashpit beneath the furnace bars. In order to
prevent it blowing straight out into the end of the ashpit, I place some distance in
front of it a dished or baffled plate H supported by suitable metal strips I on the
end of pipe G. This baffle plate deflects the air upwards, downwards and sideways
and causes it to spread tolerably uniformly over the under surface of the bars, but
to give the most powerful draught in the centre where it is most desired. The
front of the ashpit is closed by the furnace plate K so as to prevent the inforced
draught caused by the jets, from escaping out of the front. On each of the jet
pipes leading from the steam space of the boiler is a cock or stop valve L. 1 do
not confine myself however to this special arrangement of steam supply pipe or
even to the use of steam at all, as where air under pressure is obtainable its use is
even preferable to that of steam. Further, I may have one or several pipes leading
to the bridge and one or several pipes G opening out into the ashpit, further
instead of a series of round openings C there can be a long slit, and this slit or the
openings can be of any desirable shape.
The mode of action is as follows-
The fire being lighted on the hearth, steam or compressed air is passed through
the jets; the result is a powerful induced draught of air below the bars and out
beyond the bridge. By this means a very vivid combustion is caused in the
furnace. In those cases however where the steam is brought from the boiler
itself, this steam is not applicable for starting the boiler in the first instance. In
this case therefore I either start it in the usual manner allowing a good draught
through the ashpit through a door used for cleaning out the ashpit, or I supply
air by means of a bellows or otherwise. The air coming out beyond the bridge
being in the direction of the draught assists in inducing a further speed in the
"incoming air, and also causes a vivid combustion of the smoke. Whenever coal is
thrown onto the fire, the air jets are momentarily increased by the attendant by
means of the stop valves L, thus preventing smoke; the attendant however can
regulate the admission of steam to any required extent, thus during hours when the
engine is stopped, little or no stean is passed into the tubes G and B, also when
running easily these jets are in great measure shut off except immediately after
firing, when they are opened, especially the jets into tubes B, in order to overcome
the smoke. Where, however, the boiler requires forcing, the jets into tube G are

page_text: always at full pressure, and only those into tube B are regulated to suit the
requirements of the smoke. The baffle plate H can also be varied in a great
variety of ways and the tubes G can have their orifices so arranged as to spread
the air on its exit therefrom. I prefer however a curved or dished baffle plate,.
substantially as described.
The arrangement in Figures 8 and 9 is similar, but in this case, the air is
admitted above the fire thus inducing a powerful draught of air above the bars.
G is the air entrance pipe, F the ring of steam or air jets, M the fire door in which
the pipe G is. fixed, N a baffle pipe for protecting the door from the heat of the
furnace.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improvements in boiler or other furnaces which consists in an arrange-
ment of baffled injector tubes and passages for admission of air beyond the bridge
through which air is forced in regulated quantities substantially as described.
2. The arrangement of baffled air admission into the closed ashpit substantially
as herein described.
3. In combination with the forced draught, the admission of air through the
bridge into the space beyond through a long slit or series of orifices placed as near
as practicable to the top of the bridge and opening in an angular direction, so that
the forced air will impinge on the crown of the furnace behind the bridge and
mix with the gases from the furnace passing over the bridge substantially as
described.
4. In combination with the baffled air entrance pipes arranged substantially as
described, the steam jets with regulated stop valves substantially as described.
5. In combination with the air entrance pipes G the ring of steam jets
substantially as described.
T
this 12th day of November 1804.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Agents.