Improvements in Furnaces for Heating Iron or Steel.
Year: 1890

page_text: Date of Application, 17th Jan., 1890
Complete Specification Left, 15th Oct., 1890-Accepted, 15th Nov., 1890
ROVISIONAL SPECIFICATION.
Improvements in Furnaces for Heating Iron or Steel.
I, DAVID ELLIOTT, of 74 North Jackson Street, Coatbridge, in the County of
Lanark, North Britain, Mill Manager, do hereby declare the nature of this invention
to be as follows, that is to say :-
My said invention has for its object to improve the construction and operation of
furnaces for heating iron or steel.
In carrying out my invention I make the furnace building of an oblong form, and
with a grate or fuel burning chamber at each end, the operating or reverberatory
chamber extending between the fuel chambers. The exit from the reverberatory
chamber for the used fire gases is in the centre of the roof at the middle of
the chamber, the exit opening communicating with a horizontal flue leading into a
chimney erected at one side, by preference upon iron pillars.
The ash pits below the fuel grates are closed by doors and air is led into them by
steam-jet blowers or other suitable blowers; but the amount of air thus supplied is not
sufficient for the complete combustion of the constituents of the fuel, the final complete
combustion being effected in the reverberatory chamber itself. Air is injected by
supplementary blowers into tortuous flues formed under the bed of the furnace, there
being two sets of such flues each extending from the middle towards each end of the
chamber. At the ends of the chamber the flues under the bed of the furnace com-
municate by vertical flues in the side wall with spaces formed in the roof of the
chamber. The air becomes heated in the flues and roof spaces, and passes from the
roof spaces into the reverberatory chamber through holes formed in suitable positions,
and mixing with the heated gases from the fuel chambers completes their combustion,
and directs them downwards on the masses or pieces of iron or steel to be heated.
Working doors are formed in either side of the furnace, and may be made in numbers
and of sizes suitable for the masses or pieces of iron or steel to be operated on.
Dated this Sixteenth day of January 1890.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Furnaces for Heating Iron or Steel.
I, DAVID ELLIOTT, of 74 North Jackson Street, Coatbridge, in the County of
Lanark, North Britain, Mill 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, that is to say :-
My said invention has for its object to improve the construction and operation of
furnaces for heating iron or steel.
In carrying out my invention I make the furnace building of an oblong form, and
with a grate or fuel burning chamber at each end, the operating or reverberatory
chamber extending between the fuel chambers, and the exit from the reverberatory
chamber for the used fire gases being in the centre of the roof at the middle of
the chamber.
And in order that my said invention and the manner of performing the same may
be properly understood I hereunto append a sheet of explanatory drawings to be
bereinafter referred to and representing a heating furnace as constructed with my
improvements.
Figure, 1, of the drawings is a side elevation partly in longitudinal vertical
section and

page_text: In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
The furnace building, which is strengthened with external iron plates in the ordinary
way, is of the usual oblong form, but is constructed with two grates or fuel
chambers, A, A, one at each end. Each fuel chamber, A, is made with the usual
closed ash pit, and is supplied with air for the combustion of the fuel by means of a
steam blower, B, for which, however, any other suitable blower may be substituted if
desired. The fuel chambers, A, communicate by bridge ports, C, with the reverberatory
chamber, D, which extends between them. The roof, E, of the reverberatory
chamber, D, is slightly arched transversely and is inclined downwards longitudinally
from each end to the middle; and at the middle there is an exit opening in the roof, E,
communicating by a short vertical flue, F, with a horizontal flue, G. This horizontal
flue, G, is built on plates carried by two transverse iron beams, H, which at their
front ends rest on a short horizontal beam, J, carried by a pillar, K. The back ends
of the transverse beams, H, are supported on flanges on two pillars, L, which with
two other pillars, M, support the chimney, N, with which the horizontal flue, G,
communicates. Instead of the horizontal flue, G, communicating immediately with
a chimney a steam boiler may be interposed to utilise the heat of the gases passing
from the furnace.
The amount of air supplied by the blowers, B, into the fuel chambers, A, is not
sufficient for the complete combustion of the constituents of the fuel, the final complete
combustion being effected in the reverberatory chamber, D, itself. Air is injected by
means of supplementary blowers, P, into tortuous flues, Q, formed under the bed of
the furnace, there being two sets of such flues, Q, each extending from the middle
towards each end of the reverberatory chamber, D. At the ends of the chamber, D,
the flues, Q, under the bed of the furnace, communicate by vertical flues, R, (indicated
by dotted lines) in the side wall, with spaces, S, formed above the roof, E, of the
chamber, D. The air becomes heated in the flues, Q, and roof spaces, S, and passes
from the roof spaces into the reverberatory chamber, D, through holes formed in the
roof, E, in suitable positions, and mixing with the heated gases from the fuel chambers, A,
completes their combustion, and directs them downwards on the masses or pieces of
iron or steel to be heated. Working doors, T, are formed in either side of the furnace,
and may be made in number and of sizes suitable for the masses or pieces of iron or
steel to be operated on. In some cases there may be built across the middle of the
reverberatory chamber, D, a wall, indicated by dotted lines, V, in Figure, 1, and
projecting a little up into the vertical exit flue, F, for the purpose of preventing the
gaseous currents in the two parts of the furnace from interfering with each other.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination of parts constituting as a whole my improved furnace for heating
iron or steel substantially as hereinbefore described.
2. The construction of an oblong heating furnace with fuel chambers at each end
and with an exit at the middle up into a horizontal flue communicating with a chimney
to one side of the furnace substantially as hereinbefore described.
3. In furnaces for heating iron or steel, providing air heating flues under the bed
of the furnace in connection with spaces in the roof and holes through the roof for
the introduction into the reverberatory chamber of a supplementary supply of air
substantially as hereinbefore described.
Dated this Fourteenth day of October 1890.
EDMUND HUNT,
Applicant's Agent.