IMPROVE- MENTS IN SMOKE CONSUMING FURNACES
Year: 1885

page_text: COMPLETE
We, FRANKLIN BENJAMIN GIESLER, Engineer, and ADOLPH LOGEMANN, Manu-
facturer residing at 473 Maryland Street and 683 Holton Street respectively, in the
City of Milwaukee County of Milwaukee and State of Wisconsin in the United
States of America, do hereby declare the nature of the invention for "IMPROVE-
MENTS IN SMOKE CONSUMING FURNACES" and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:
In the drawings hereto annexed-
Fig. 1, is a front elevation of a furnace embodying the invention.
Fig. 2, is a vertical longitudinal section through the centre of the furnace, and
Figs. 3 and 4 are details.
A, is the furnace, having the usual boiler, B. C, C, are doors that open in the
combustion chambers, and, C¹, C¹, are doors that give access to the draft chamber
beneath the grate, and from the draft chamber short flues, D1 D₁, lead into a
horizontal flue, D, which latter is connected at one end with a blower, E, and at the
other has an exhaust pipe, E¹, leading down into it, F, is a smoke chamber which
is connected with the furnace by a flue, FL, and with the blower, E, by a pipe, F.
G, is the smoke-stack which is provided, close to its point of connection with
the smoke-chamber, with a damper, g, a slight distance above which the exhaust
pipe, E, enters the said smoke stack.
Another damper, f, is fitted in the pipe, F2, close to the smoke-chamber, and
connected to the lower part of the said pipe, F2, is a small flue, F³, open at its lower
end to admit fresh air through the regulating valve, f¹.
The short flues, D¹, D¹, which connect the horizontal flue, D, with the draft
chamber and also provided with dampers, f3f2.
The lower end of the exhaust pipe, E¹ passes down into the flue, D, and terminates
close to its bottom. It is provided with a lift valve, e, the stem, e¹ of which carries
an adjustable weight e2, and is projected far enough toward the furnace to come in
the line of travel of a plate or rod, a, that is freely connected to the crank, a¹, of
the shaft, A', carrying the cone pulley a², mounted with its companion pulley, a³,
in any suitable form of hanger on the corresponding side of the furnace.
The cone pulley, a³, is connected in any suitable manner with the driving
mechanism. In the centre of the combustion chamber we provide a flue, H, of any

page_text: suitable form, but preferably of the shape shown in Figs. 3 and 4; this flue extends
the whole length of the fire-bed, its closed bottom resting on top of the grate
bars h, h; in the upper part of this flue, a series of perforations, h¹ h h h¹, are
made on each side; a passage, H³, is formed in front of the furnace, between the
doors C, C, to admit fresh air from the outside to the said flue, H, through a
corresponding opening, H³, in the end wall of the flue, and this passage has a trap-
door, H, which may be kept more or less open by means of any form of adjustable
latch in use.
The blower, E, is belted in any suitable manner, as at pulley, E³
with the driving mechanism.
The operation of the device is as follows:-
When the furnace fire is first lighted, the damper, g, in the smoke-stack, G, is
opened, and the smoke passes out in it, until sufficient steam has been raised to
operate the blower, but when this occurs, the damper, g, is closed, and the damper f
of pipe, Fs, as well as the dampers, ff, in the short flues, D¹, being opened, the
blower will draw the smoke from the chamber, F, and force it through the fluc, D,
and its branches, D¹, and into the fire-box, together with a certain quantity of fresh
air that is induced in the same time through the small flue, F³, the amount of air
thus admitted being regulated by means of the valve, ƒ¹.
The valve, e, in the lower end of the exhaust pipe, E¹ is lifted at intervals
determined by the position of the belt that connects the cone pulleys, a³ and a³,
and this intermitting opening will permit the carbonic acid gas and surplus smoke
to pass out and away.
This valve may moreover be set so as always to be partly open, so that there
may be a constant draft that will carry off the carbonic acid gas in flue, D, while
the smoke is forced through the fire box to form part of the fuel.
As the fresh air admitted through the door, H₁, and opening or passage, H2, into
the flue, H, becomes sufficiently heated, it rushes up through the perforations in the
upper portion of the said flue, and besides producing a current that powerfully
induces the return smoke up through the fire-bed it contributes its additional
volume of oxygen to materially aid the combustion of the gases.
Having now particularly described the nature of the said invention and in
what manner the same is to be performed we declare that what we claim is
1, The combination with a furnace of pipes, D, D₁, F1, F2 and F3, the reservoir
and blower, pipe E¹, and its valve, and mechanism for lifting the latter at set
intervals.
2, In a smoke consumer, in combination with the furnace, A, the horizontal
flue, D, and branches, D¹, D', of a chamber, or flue, formed above the grate-bars in
the centre and the whole length of the furnace, and having its closed bottom resting
on the grate-bars, suitable perforations on each side near its top, and an adjustable
door opening in the furnace front.,
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