Improvements in Furnaces to Promote Combustion.
Year: 1890

page_text: Date of Application, 22nd May, 1890
Complete Specification Left, 12th Nov., 1890-Accepted, 13th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in Furnaces to Promote Combustion.
We, TOM NORMAN, Birch Road, Sheffield, in the County of York, Engineer, and
HARCOURT TASKER SIMPSON, Sharrow, Sheffield aforesaid, Manager, do hereby declare
the nature of our invention to be as follows:-
We propose to carry an air pipe, say for example of six inches diameter, from the
top of the furnace or thereabouts, the said pipe being built in the brickwork, down
the side of the furnace, and through the bridge or the bridge may be hollow to form
a continuation of the pipe: at the opposite end of the bridge we fix a bend of piping
to connect the opening in the bridge with a lower transverse air chamber which
extends across or partly across the furnace underneath the bridge and the firebars.
This air chamber is provided with any desired number of ports or jets preferably
pointing up to the underside of the firebars at an angle of forty-five degrees or
thereabouts.
The end of the pipe near the top of furnace is open to the atmosphere, and we
force air through the pipe and the bridge by the aid of a steam jet applied in any
suitable part of the pipe.
The mixture of air and steam as it passes along and through the bridge becomes
superheated, and is forced through the bars into the back of the firebox, in a highly
gaseous condition, meeting the smoke and causing more perfect combustion.
Dated the 19th day of Nov 1890
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.
COMPLETE SPECIFICATION.
Improvements in Furnaces to Promote Combustion.
We TOM NORMAN, Birch Road, Sheffield in the County of York, Engineer, and
HARCOURT TASKER SIMPSON, Sharrow, Sheffield aforesaid, Manager 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:-
Our invention relates to improvements in furnaces, having for its object to improve
the combustion of the fuel, and to diminish the production of smoke, and although
we illustrate and describe its application to an ordinary reheating furnace, it will be
understood that with slight modifications in the method of its application, the system
may be applied to the furnaces of steam boilers and other furnaces.
In carrying out our invention as applied to a reheating furnace such as illustrated
in the drawings annexed in which
COMPLETE SPECIFICATION.
Improvements in Furnaces to Promote Combustion.
We Toм NORMAN, Birch Road, Sheffield in the County of York, Engineer, and
HARCOURT TASKER SIMPSON, Sharrow, Sheffield aforesaid, Manager 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:-
Our invention relates to improvements in furnaces, having for its object to improve
the combustion of the fuel, and to diminish the production of smoke, and although
we illustrate and describe its application to an ordinary reheating furnace, it will be
understood that with slight modifications in the method of its application, the system
may be applied to the furnaces of steam boilers and other furnaces.
In carrying out our invention as applied to a reheating furnace such as illustrated
in the drawings annexed in which
Fig. 1 is a side clevation,
Fig. 2, a plan,
Fig. 3, a sectional side elevation,
Fig. 4, end elevation,
and in which similar letters of reference indicate similar parts, in any of the
figures.
We fix an air pipe A, (say for example six inches diameter) having its open end
above the top of the furnace or in other convenient position, and carry it down
through the brickwork of the furnace to one side of the bridge B, through, (or
partly through) which it passes in a horizontal position, and terminates vertically in

page_text: a chamber (or more than one if desired) formed under the bridge and extending
from side to side or thereabouts.
If preferred instead of carrying the air pipe through the bridge, an equivalent
opening or passage may be formed in or through the bridge as a continuation of tho
pipe and communicate in a similar manner with the air chamber C before mentioned.
The horizontal pipe, passage, and chamber may if desired be prepared with removable
ends to allow of cleaning out, these are not shown in the drawings.
The air chamber C under the bridge is below the level of the firebars D, and
is provided with one or more mouths or ports of exit E, these mouths are made
to incline upwards from the air chamber C and to open a little below the ends of the
firebars.
Centrally above the open end of the air pipe A, we fix a steam jet J, say for example
of one-eighth of an inch in diameter, for the purpose of forcing the air into and
through the said pipe and chamber.
The combined air and steam passing through the heated pipe and bridge, becomes
superheated and extremely rarified and gaseous, and issuing from the inclined
mouths E is forced through the grating or spaces between the firebars at the back end
of the furnace or firebox. In its highly gaseous condition, it ignites and mixing
with the smoke causes more perfect combustion.
Although we have described the invention as carried out with one air pipe A, we
may if desirable use more than one.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, or carried into practice, we
declare that what we claim is ;-
1st. In connection with furnaces of any description to which the invention may be
applicable, the hereinbefore described arrangement of an air inlet pipe or conduit, (or
more than one if desirable) provided with a steam jet, and carried through the brick-
work of the furnace to the bridge, the said pipe or air conduit passing through, or
nearly through, the bridge, and opening into a subjacent chamber or chambers, having
one or more upwardly inclined openings or mouths, under the back end of the firebars,
for the purpose specified, and substantially as illustrated.
2nd. In connection with furnaces, the arrangement of an air-chamber under the
bridge of the furnace, provided with one or more mouths inclined upwards, and
opening under the back end of the firebars, the said chamber being also connected
with one or more air supplying conduits and steam jets for the purpose specified, and
substantially as hereinbefore described and illustrated.
Datad the 37th da
1000
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.