MENTS IN AND IN CONNEXION WITH STEAM BOILER AND OTHER FURNACES
Year: 1884

page_text: J, GEORGE WASHINGTON MEARS, of Norwaltz, Ohio United States of America,
Sheet Metal Worker, do hereby declare the nature of my invention for IMPROVE-
MENTS IN AND IN CONNEXION WITH STEAM BOILER AND OTHER FURNACES and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement, reference being had to the accom-
panying drawings making a part of this Specification in which Fig. 1, represents a
plan view of the inside of a furnace and the appliances for consuming the smoke
adapted thereto, Fig. 2, is a longitudinal section of the same, Figs. 3. and 4 are
detached sections.
Like letters refer to like parts in the several drawings.
As shown in the drawings A, represents the body of a steam boiler furnace, which
in its general structure is like that in ordinary use, in which B is the fire place,
C the grate bars, D the ash pit, E the crown or arch of the fire place, and P a section
of a steam boiler, all of which is or may be similar to such structures as the ordinary
kind. At the rear end of the furnace and above the crown or arch E, is a hot air
chamber G, shut off from the fire place by the partition wall H, and by that part
of the arch at I. Through the hot air chamber passes the end of the flue J, and
through the partition wall and terminates in open communication with the fire
place. The flue is also in open relation with the hot air chamber G, by means of
the perforations a in the end of the flue passing through the chamber as seen in
the drawings.
The foraminous end of the flue is oval in shape as shown in fig. 4, which
represents a cross section of the flue taken through the line X, X, and which may
be continued the same shape or round to the end K, terminating in the stack or
chimney L, which may be more or less distant from the furnace.
The end K, of the flue is oval and of the shape shown in fig. 3, in which it will
be seen that the end is partly arched over by the sides b, b, leaving a slot like
opening c. between the inward projecting sides, (the purpose of which will presently
be shown). The flaring end of the stack L, is provided with a foraminous
diaphragm N, through which the end of the flue passes as shown in the drawings.
Further attention will be given to this part of the flue hereinafter.
The side wall O, of the furnace is penetrated by air pipes 1, 2, and 3, which enter
the fire place above the arch E, as shown in fig. 2. It will be observed that the

page_text: •
inner ends of the air pipes extend to and terminate in the hot air chamber, the
pipe 1, below the end of the flue J, and the pipes 2, and 3, at or near the sides
thereof. 4 is also an air pipe piercing the wall of the furnace and terminating in
the fire place instead of in the hot air chamber. The opposite wall of the furnace
is in like manner pierced with air pipes 11, 2, and 31, corresponding to the air pipes
above described, and which terminate in the chamber G, in the same way. 4¹ is also
an air pipe corresponding to the air pipe 4, and in like manuer terminates in the
fire place, but a little nearer the front than the pipe 4, as seen in fig. 1.
Below the grate bars is arranged an air pipe A', extending from the outside of
the front of the ash pit back to the rear end thereof as shown in fig. 2. In the
rear wall of the ash pit are perforations e to which is applied a perforated slide or
damper d, for opening and closing the perforations e as may be desired. B' is the
door of the furnace hinged thereto at C. To the said door is secured a chute or
hopper D covering the opening E¹, through which coal is fed to the furnace from
the chute. F is a slide arranged vertically in the chute before the opening E¹, by
which said opening is closed and opened for the passage of coal from the chute into
the furnace. G¹ is a lid covering the end of the chute.
Having described the construction of the furnace and the appliances as shown
and adapted thereto for consuming smoke, the practical working of the same is as
follows,
The hopper or chute D', is supposed to be filled with coal, which is fed to the
furnace by raising the slide F', under which the coal passes slowly onto a bed of
incandescent coals thereby avoiding the necessity of opening the door of the furnace
for supplying it with fresh fuel, and which also prevents a rush of cold air into the
furnace as would be the result if the door was opened. As the smoke and eliminated
gases pass from the bed of incandescent coals up to and over the arch E, as indicated
by the arrows, they are supplied with air to cause their combustion by means of
the pipes 4 and 4. A further supply of air is furnished to continue the combustion
of the smoke and gases through the perforations a, of the flue J. The air for this
purpose is from the hot air chamber G, which is in a highly heated state, it having
become so highly heated in passing through the pipes 1, 2, 3 &c, which are heated
by the furnace, so that the cold air entering the pipes from the outside becomes
heated to a high degree when discharged into the chamber G, and which escapes
therefrom into the flue J, through the perforations a, in small jets or currents.
The heated air thus broken up in passing through the perforations mingles
intimately with the smoke and gases, that may pass into the flue, hence results a
more complete consumption of the smoke &c. Should any remain unconsumed at
this point for want of sufficient air, a further supply is had to meet this want at
the end K, of the flue, which is supplied at that point through the foraminous
diaphragm N, in fine jets which at once mingles with the smoke and gases if there
be any issuing from the flue, and completes the consumption thereof. The smoke &c
that may be issuing from the end K, of the flue, is of a wide fan shape of no great
width by virtue of the peculiar form of the end of the flue, hence there is an
immediate commingling of the air and smoke for the purpose above specified. The
use of the pipe A₁, is to convey air to the rear end of the grate in the event
the structure of the furnace is such that. the air holes e, cannot be made available
for that purpose.
•
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. In combination with the fire place of a steam boiler furnace or other furnace
or furnaces, a hot air chamber situated at the rear end of said furnace and above
the crown or arch thereof, air pipes 1, 2, and 3, and air pipes 1', 2' and 31,
respectively penetrating the side walls of the furnace into the fire place thereof
above the arch and extending therefrom into the hot air chamber in which they
terminate substantially as described and for the purpose set forth.

page_text: 2. In a furnace for steam boilers the air pipes 4, and 41, respectively penetrating
the side walls of the furnace above the crown or arch E, substantially as described
and for the purpose specified.
3. In a steam boiler furnace the flue J, having the perforations in the end
thereof enclosed in the hot air chamber G, and the open end of the flue terminating
in the fire place of the furnace, in the manner substantially as described and for the
purpose specified.
4. The flue J, having its upper end terminating in a slot shape opening c, formed
by the inward projecting sides of the end of the Blue in combination with the stack
or chimney provided with a foraminous diaphragm through which the flue passes
substantially as set forth and for the purpose specified.
5. Attached to and in combination with the door of a steam boiler furnace the
chute D'. provided with a slide substantially as described and for the purpose set
forth.
G. Arranged in relation to and in combination with a steam boiler furnace or
fire place thereof, the inclined arch or crown E, air pipes 4 and 41, terminating in
said fire place, hot air chamber and side pipes extending froin the outside of the.
furnace into the fire place, thence to the hot air chamber in which they terminate,
flue J, having the perforations in the end thereof in open relation with the said
chamber and open end of the flue terminating in the fire place of the furnace, and
the upper end provided with a slot like opening c, and inturned sides forming an
arch on each side of said opening, and the stack or chimney having a perforated
diaphragın substantially as herein described and for the purpose specified.
Dated this 14th day of October 1884.