Improvements in Preventing or Consuming Smoke and in Economis- ing Fuel in Steam Boiler and other Furnaces or Fires, and in Apparatus Connected therewith.
Year: 1888

page_text: Date of Application, 17th July, 1888
Complete Specification Left, 17th Apr., 1889-Accepted, 15th June, 1889
PROVISIONAL SPECIFICATION.
Improvements in Preventing or Consuming Smoke and in Economis-
ing Fuel in Steam Boiler and other Furnaces or Fires, and in
Apparatus Connected therewith.
ROBERT MACINTYRE Senior, 25 Broomhall Place, Sheffield, Engineer, do hereby
declare the nature of this invention to be as follows:-
--
This Invention has for its object that of burning or consuming Smoke in the
furnaces of Steam Boilers by the judicious admission of heated air which is allowed to
mingle with the products of combustion at a point calculated to insure their complete
ignition.
Generally speaking my apparatus consists of a pipe or flue connecting the outside
of the boiler with the crown of the fire-box and discharging into the latter at a point
partly over or in front of the furnace bridge.
This pipe or flue 1 flatten so as to take the form of an elongated ellipse as it enters
the crown of the fire-box thus securing a more uniform distribution of heated air with
the unconsumed products of combustion.
To the opposite or outer end of this pipe I attach another pipe with an internal
chamber so constructed that the air passing through it is raised to a high temperature.
This heat I obtain by means of a small quantity of steam circulating through the
casing of the before mentioned internal chamber, but I may further increase the
temperature by drawing the air through a pipe heated in the main flues or otherwise.
To the lower end of the internal heating chamber I apply a jet or nozzle through
which the steam issuing at a high velocity induces a current of the heated air
propelling the same along the before mentioned pipe or flue into the fire-box.
The amount of steam necessary 1 can regulate by hand but I prefer using an
automatic valve so constructed and arranged that the supply is either diminished or
cut off when the smoke has ceased.
In the pipe or flue already described I place a valve so constructed and arranged as
to prevent back-draught when the chimney damper is closed. With a view to
rendering the whole apparatus more complete and automatic in its action I make a
suitable connection between this valve and the chimney damper as well as with the
steam jet already mentioned so that the mere operation of opening or closing the
chimney damper will produce the desired effect on the moving parts of the apparatus
as a whole.
By these means I am able to regulate the admission of air sufficient in volume to
combine with and consume the smoke, or increase the draught in the main flues when
desirable, while I obviate all extra or unnecessary attention on the part of the stoker.
Dated this Fourteenth day of July 1888.
RUDER MAGINI DI
COMPLETE SPECIFICATION.
Improvements in Preventing or Consuming Smoke and in Economis-
ing Fiel in Steam Boiler and other Furnaces or Fires, and in
Apparatus Connected therewith.
1 ROBERT MACINTYRE, Senior of 25 Broomhall Place, Sheffield, Engineer, do hereby
declare the nature of my said 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 that of burning or consuming smoke in the furnace
of Steam Boilers by the judicious admission of heated air which is allowed to mingle

page_text: with the products of combustion at a point calculated to ensure their complete
ignition.
Generally speaking my apparatus consists of a pipe or flue connecting the outside
of the boiler with the crown of the-fire box and discharging into the latter at a point
partly over or in front of the furnace bridge.
This pipe or flue I flatten so as to take the form of an elongated ellipse as it enters
the crown of the fire box thus securing a more uniform distribution of heated air
with the unconsumed products of combustion. To the opposite or outer end of this
pipe I attach another pipe with an internal chamber so constructed that the air
passing through it is raised to a high temperature.
This heat obtain by means of a small quantity of steam circulating through the
casing of the before mentioned internal chamber but I may further increase the
temperature by drawing the air through a pipe heated in the main flues or otherwise.
To the lower end of the internal heating chamber I apply a jet or nozzle through which
the steam issuing at a high velocity induces a current of the heated air propelling the
same along the beforementioned pipe or flue into the fire box. The amount of steam
necessary I can regulate by hand but I prefer using an automatic valve so constructed
and arranged that the supply is either diminished or cut off when the smoke bas
ceased.
In the pipe or flue already described I place a valve so constructed and arranged as
to prevent back-draught when the chimney damper is closed.
The accompanying drawings represent my invention as applied to a Cornish
boiler.
Figure 1 is a transverse section of my apparatus and the boiler.
Figure 2 a longitudinal section.
Figure 3 shows the boiler in longitudinal section with my apparatus fitted thereto
in a modified form.
Figure 4 represents a part of my apparatus viz. the lower tube sprayed out into
the form of an elongated ellipse where it is attached to the crown of the boiler.
A is the boiler. the fire box. C the bridge just in front of and above which
and attached to the crown of the flue is my sprayed out or elongated elliptical end D
of the lower pipe E which is carried up through a steam way to the outside of
the boiler preferably in two pieces connected by an expansion joint F, the upper
part G carrying a throttle valve H and provided with a chamber I covered with a
cap J having holes between its flange .and a top of the chamber box I for the free
ingress of air to pass down G, E, through the elongated elliptical aperture K into the
rear of the fire box B just in front of the bridge C as before explained.
L is a pipe for conveying steam from the upper part of the boiler A to a nozzle or
steam jet M by which a strong current of air is induced to enter the apertures in
the cap J and be forced into the fire box where they combine, commingled with the
uncorsumed products of combustion, passing over the bridge into the flue N, said
flue forming a gas expansion and heating chamber where great heat is developed for
being imparted to the boiler shell, the smoke being consumed that little more than
a vapour will escape to the uptake or chimney.
By placing the pipes G, E, in the steam and water way of the boiler great heat is
imparted to these pipes G, E, consequently the air in passing down said pipes is
intensely heated previous to its action on the products of combustion said air being
rendered gaseous and in a fit state for ensuring the thorough combustion of all smoke
and products escaping over the bridge.
To enable my apparatus to be operated when the fire is fed with fresh fuel I by
means of handles P (one only shown) and chains Q, Q', which pass over rollers R
regulate the passage of steam and also the amount to which the throttle valve H shall
be opened.
By having the two chains I can if steam is not necessary to force air through the
pipe G, E, by pulling on the chain Q₁ open the valve H to the required degree
without moving the steam tap and this I effect by making a slot in the lower end of
the rod S by which the steam tap and valve arm are otherwise connected but if I

page_text: wish to open the steam I pull on the chain Q and then both the steam tap and the
valve will be open together, again; if I desire to shut the valve H to prevent back
draught when the chimney damper is closed I let the chain Q¹ go loose, the valve H
then closing by the weight of its lower arm dropping to the bottom of the slot in the
rod S.
According to Figures 1 and 2 I have shown my apparatus in a vertical position
over the fire box B but at Figure 3 I show the pipe G and E bent so that the upper
part of the pipe G projects through the front shell of the boiler otherwise the apparatus
is the same.
With a view to rendering the whole apparatus more complete and automatic in its
action I make a suitable connection between this valve H and the chimney damper as
well as with the steam jet M already mentioned so that the mere operation of opening
or closing the chimney damper will produce the desired effect on the moving parts of
the apparatus. By these means I am able to regulate the admission of air sufficient
in volume to combine with and consume the smoke or increase the draught in the
main flues when desirable while I obviate all extra or unnecessary attention on the
part of the stoker.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is
1. The apparatus hereinbefore described consisting of the parts marked D, E, F, G;
H, I, J, K, and fitted to a steam boiler for admitting air in a highly heated state to
the upper part of a fire box as and for the purposes described, whether the air be
accelerated through the pipe G, E, by a jet of steam from M and operated by the
means or appliances shown on the drawings or otherwise.
2. Fitting a pipe E, G, between and connecting said pipe to the flue shell and
the boiler shell respectively so that said pipe E, G, is partly in the water way and
partly in the steam space for heating air previous to its admission into the fire box for
commingling with the smoke and products of combustion given off from the fire
substantially as shown in the drawings and as and for the purpose described.
3. The construction of a pipe E having one end flattened or of elliptical form and
attached to the crown of a fire box of a boiler and serving as a conveyor of air
(impelled or not) into the fire box of a boiler at a point partly over or in front of the
furnace bridge as described.
.
The 17th day of April 1
H. GARDNER,
-Per R. Core Gardner,
166, Fleet Street, London, Agent for the said R. Macintyre, Senior.