Improvements in Apparatus_for Consuming Smoke and Economising Fuel in Steam Boiler and other Furnaces.
Year: 1889

page_text: Date of Application, 13th June, 1889
Complete Specification Left, 13th Mar., 1890-Accepted, 3rd May, 1890.
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Improvements in Apparatus_for Consuming Smoke and Economising
Fuel in Steam Boiler and other Furnaces.
We, EDWARD PRIME, of Barrington, Manufacturer, WILLIAM LEE, of Melbourne
Miller, both in Cambridgeshire, and WALTER EDWARD COCKS, of Bassingbourn, Cam-
bridgeshire, Engineer, do hereby declare the nature of this invention to be as follows:-
This invention primarily relates to the introduction of heated air into the fire
preferably at the back of the bridge of the furnace to better enable the inflamable
gases which have hitherto been lost or only partially burnt to be fully burnt as fuel,
as well as the soot, carbon, and oxides, to keep the flues clean.
According to this invention the bridge of the furnace is made to hold a box or
chamber to receive air and emit it hot at the end of the fire to enable the gases to
be burnt to consume the smoke. Hot air can also be conducted from the said chamber
by suitable pipes to surround the feed water holder to heat the water. The air is
introduced into the box or chamber in bridge by a suitable conducting pipe or pipes
having the inlet end fitted with a funnel to enable a larger quantity to be drawn in ;
or several funnels may be concentrically arranged on the mouth of the inlet tube.
For locomotive furnaces the air chamber can be either fitted in the smoke box or
around it, with suitable divisions that the current of air may receive a backward and
forward movement that it may be heated sufficiently before going through tubing at
either inside or outside of the boiler, into the fire box. Another plan is to have tubing
twist ed round and round or in spiral or zigzag form fitted in the smoke box, and the
air lead off by tubing into the fire box; or we can form a chamber to receive the
air in the fire brick usually used in the fire box of locomotives, the air being supplied
direct through tubing either inside or outside of the boiler and a box or case can be
fitted in any part of the boiler, foot plate, framing, or tender, and heated by steam
and lead off to the fire box by tubing as before mentioned.
Tinted thin 12th day of June 1889
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, London, Agent for Applicant s
"
Improvements in Apparatus for Consuming Smoke and Economising
Fuel in Steam Boiler and other Furnaces.
We EDWARD PRIME, of Barrington, Manufacturer, WILLIAM LEE, of Melbourne
Miller, both in the county of Cambridgeshire, and WALTER EDWARD COCKS, of
Bassingbourn, Cambridgeshire, 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 primarily relates to the introduction of heated air into the fire over
the fuel at the commencement of the flue to better enable the inflammable gases
which bave hitherto been lost or only partially burnt to be fully burnt, so as to give
out their caloric; which prevents the formation of soot and so keeps the flue clean,
and economises fuel.
To enable our invention to be properly understood, we will proceed to explain the
same with aid of the accompanying drawings.
Figure 1 is a sectional side elevation of a stationary boiler with one plan of applying
our invention.

page_text: Figure 3. cross section on line a, b, figure 1.
Figure 4. detached large view of outside nozzle of pipe.
Figure 5. front view of bakers oven, with our invention applied.
Fig. 6. partial section of furnace part of same.
Fig. 7. partial plan view of oven and furnace.
Fig. 8. sectional elevation of locomotive.
Figure 9. plan of same.
Figure 10. sectional end view.
Referring to figures 1, 2, 3, A is the ordinary fire bridge, at the back of this is
arranged a box B, preferably of cast iron, with a curved top C, to have an outlet D ;
connected to this box B, is a pipe E, which passes down the flue, of the boiler,
through the water heater F, through the setting and down the side return flue, to
the outside where it is fitted with concentrically arranged funnels G, for the intro-
duction of air. To enable a good current of air to be drawn in, arrangement is
made for the introduction of a jet of steam. In place of this any known suitable
means, such as a fan, could be used. A modification of this arrangement would be
to form a chamber in the return flue to heat the air in and to divide the pipe E, and
connect both ends, one to each end of the chamber; or the pipe E instead of being
straight might be serpentine or zigzag arrangement.
Referring to figures 5, 6, 7. In the arrangement shown in these figures the air is
heated before passing into fire by passing into a box or chamber J, placed over the
fire, having an inlet K, into fire, this inlet has a slide valve L, to close the same as
desired; the air is admitted into box J, through opening in front arranged to be
closed by sliding doors M, opposite the inlet for the air is a baffle plate N, to check
the inrush of air and throw it over the entire surface of the heating chamber J.
Referring to figures 8, 9, 10. In the arrangement shown here, as applied to loco-
motive boilers, the tube E is preferred flat fitting the contour of the boiler plates upon
which it rests, and protected from the atmosphere, by usual coat of known material,
this tube passes along one side of the boiler, into and forming a half circle in the
smoke box, and back along the other side of the boiler, into furnace, through end of
boiler; over top of furnace door, injecting the heated air into fire over the top of the
smoke consuming bridge O. We are aware that it has been proposed to introduce
cold air into the flue of a boiler immediately behind the furnace bridge to enable the
unconsumed gases to be burnt. We are also aware that it is not new to introduce
heated air into fire through the fuel as is done in blast furnaces.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed, we declare that what we.
claim is:
1. In the furnace of a boiler the combination of a tube E, box B, top C, and
opening D, all arranged as and for the purposes stated and as illustrated by the
accompanying drawings.
2. In the introduction of air into a boiler flue the combination of a tube E fitted
with funnel or funnels H, and a jet of steam to induce a current of air through the
pipe, as described and illustrated by the accompanying drawings.
3. In bakers ovens, arranging an air heating chamber, over the furnace, to
be heated by the same, communicating with the flue to enable heated air to
be introduced into flue, as described and illustrated by the accompanying
drawings.
4. The means as described for introducing heated air into the fire over the fuel of
a locomotive furnace, consisting of the pipe E, heated by the boiler and in the smoke
box, fitted with funnel H, and a jet of steam passing into H, to induce a current of
air through tube E.
5. In the introduction of heated air into the flue or over the fuel into the fire of a

page_text: furnace, of a pipe to conduct the heated air into flue or over the fuel into the
fire, and an artificial or made current or draught. of air applied to the pipe, as
described.
Dated this.13th day of March 1890
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, London, Agent for Applicants.