Improvements in relation to Furnaces for Steam Boilers and other Purposes.
Year: 1887

page_text: Date of Application, 15th Sept., 1887
Specification Accepted, 18th Oct., 1887.
COMPLETE SPECIFICATION.
Improvements in relation to Furnaces for Steam Boilers and other
Purposes.
We, JOSIAH BANCROFT, of Gee-Cross, Hyde, Cheshire, Engineer, and WILLIAM
WILD, of Gee-Cross, Hyde, Cheshire, Estate Agent, do hereby declare the nature of
this invention and in what manner the same is to be perforined, to be particularly
described and ascertained in and by the following statement :-
The improvements relate to furnaces for steam boilers or other purposes and have for
object the prevention of smoke, and the more economical combustion of the fuel
therein.
In carrying out our improvements we connect the flue or flues or the chimney with
the front portion of the furnace, by means of a tube or pipe or pipes of sufficient
diameter for the object in view. One end of this tube or pipe, or range of pipes, we
extend into the chimney or the flue or flues leading thereto, and, by preference, we
fix a damper in the flue or chimney by which the same may be partially closed. The
other end of the pipe, or range of pipes, is carried into the furnace, either at the top
or at the bottom or both, or it may be by way of the ash pit to the bridge where such
is employed.
At any convenient point in this length of tube or pipe we insert, or fix in connection
therewith, a steam jet communicating with the boiler or other source of steam supply;
or, in lieu of a steam jet we may employ a fan, or any mechanical equivalent therefor
driven by power from any source.
The object of this steam jet or fan is to draw the heated gases which are incompletely
burned from the chimney or flue or flues, together with any heated air combined
therewith, and to pass the same again through the furnace. In connection with this
apparatus any suitable door to the furnace, or ash pit, or both, may be employed for
regulating the amount of fresh air entering therein, and the steam pipe and tube or
pipe for the hot gases may be provided with suitable taps or valves for regulating the
amount of steam to be employed, and of the unconsumed and other gases to be
brought forward.
But that the improvements may be better understood, we will by the aid of the
accompanying drawings proceed more fully to describe means employed by us.

page_text: Fig. 1, shews an elevation of a steam jet arrangement, and Fig. 2, shews another
form thereof, and Fig. 3, an elevation of a fan arrangement, constructed in accordance
with our invention.
The same letters indicate corresponding parts wherever they occur.
a, a, is a portion of the range of piping or tube connecting the chimney or flue
with the front portion of the furnace.
b, b, is the steam pipe inserted therein, the continuance of which is shewn by the
dotted lines. and c, c, is the fan placed in circuit, and mechanically driven by the
strap c, e, or other means. The pipes or tube a, a, may be straight or bent
for convenience and the steam pipe may enter the same at any suitable point or
angle.
In the drawings, the pipe or tube a, a, is broken off at each end of the apparatus,
but the end, d, is continued on to the front portion of the furnace or furnaces where
it may enter at the top or bottom thereof, or be carried to the bridge therefrom in the
case of steam boiler furnaces, either through the furnace, or, by preference, along
the ash pit.
The other end of the pipe or tube, e, is continued into the flue or flues or thence or
direct into the chimney.
The steam pipe b, b, at the end, f, is shewn also broken off, but it is continued in
any convenient direction to the steam boiler or other source of steam supply.
In practice the steam jet is turned on and regulated by any form of valve or tap as
at g, or the fan is set in motion by the mechanical power, when the gases travel in the
direction of the arrows from the chimney or flues into the furnace or furnaces.
Although two forms only of steam jet apparatus are shewn, and one fan, many
other equivalent forms together with variations in the size of such and of the pipes
and their arrangement in detail, may be made without departing from the peculiar
character of the invention.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. The employment of a steam jet within a tube or pipe or pipes connected at
one end with the chimney or flue, and at the other end with the furnace, for the
purpose of bringing forward the unburnt and other gases from the chimney or flue
to the front part of the furnace for the prevention of smoke and kindred objects
substantially as herein shewn and described.
2. The employment of a fan or other mechanical equivalent in connection with
such tube or pipe or pipes for the same object aforesaid.
Dated this 14th day of September 1887.
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester,
Agent.