Improvements in Supplying Heated Air to Steam Generating and other Furnaces.
Year: 1891

page_text: Date of Application, 19th Dec., 1891
Complete Specification Left, 17th Sept., 1892-Accepted, 22nd Oct., 1892
INUYIONAL DI DIFICATION.
Improvements in Supplying Heated Air to Steam Generating and
other Furnaces.
I, GEORGE WILLIAM HAWKSLEY of Brightside Boiler Works, Sheffield, in the
County of York, Manufacturer do hereby declare the nature of my invention to be
as follows:-
This invention relates to a simple, and effective method of supplying heated air
to the combustion chambers of steam boilers and other steam generators, and which
may also be applied to other furnaces.
The object of the invention is to supply a stream of heated air in such a manner
as to cause the more perfect combustion of the unburnt gases given off from the fuel
and thus to reduce the production of smoke and to increase the draught.
To carry the invention into practice I propose to fix an air tube, or conduit near
the crown of the flue and running longitudinally with it over the fire bars, terminating
in a nozzle or spreader at some little distance from the bridge. The flat extended
mouth of the spreader is so arranged as to direct the expelled blast of hot air in a
line with the top of the bridge or thereabouts, and the front end of the tube or
conduit is attached to and passes through the front plate above the fire doors, and
is conveniently formed to receive a small jet of steam, or of compressed air.
When the jet above named is turned on, a current of steam and air, or of air
alone as the case may be is forced along the hot pipe or like conduit and is expelled
from the nozzle or spreader, in a sheet across the heated gases or products of com-
bustion which are passing forward to the flue, mixing with the said hot gases and
unconsumed products, and causing them to be completely consumed.
The blast from the spreader travelling in the same direction as the heated gases
from the fuel, increases the draught and therefore tends to promote the combustion
of the fuel.
Although I have only mentioned one pipe or conduit, two or more may be used
opening into one nozzle or spreader, or each having its own separate nozzle.
Dated the 16th day of December 1891.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Supplying Heated Air to Steam Generating and
other Furnaces.
I, GEORGE WILLIAM HAWKSLEY of Brightside Boiler Works, Sheffield, in the
County of York, Manufacturer 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 :-
This invention relates to a simple, and effective method of supplying heated air
to the combustion chambers of steam boilers, and other steam generators, and which
may also be applied to other furnaces.
The object of the invention is to supply a broad stream of heated air in such a
manner as to cause the more perfect combustion of the unburnt gases given off from
the fuel and thus to reduce the production of smoke and to increase the draught.
The annexed sheet of drawings represents one arrangement of carrying out my
invention, in which a single air tube is used.

page_text: Fig. 1, is a sectional elevation of the front part of a single flue steam boiler,
showing the furnace and air tube.
Fig. 2, is a sectional plan of same.
To carry the invention into practice I fix an air tube or like conduit A, near the
crown of the flue B, and running longitudinally with it over the fire .bars C,
terminating in a nozzle. or spreader D, at some little distance from the bridge E.
The flat and laterally extended mouth of the spreader D, is so arranged as to direct
the expelled blast of hot air in a line with the top of the bridge E, or thereabouts,
and the front end of the tube or conduit A, is attached to and passes through the
front plate F, above the fire doors G, and is conveniently formed to receive a small
jet of steam, or of compressed air H.
When the jet above named is turned on, a current of steam and air, or of air alone
as the case may be, is forced along the hot pipe or like conduit A, and is expelled
from the nozzle or spreader D, in a sheet across the heated gases or products of
combustion which are passing forward to the bridge and flue, mixing with the said
hot gases and unconsumed products, and causing them to be completely consumed.
The blast from the spreader travelling in the same direction as the heated gases
from the fuel, increases the draught and therefore tends to promote the combustion
of the fuel.
Although I have only mentioned one pipe or conduit, two or more may be used
opening into one nozzle or spreader, or each may have its own separate nozzle.
Having now particularly described and ascertained the nature of my invention,
and in what manner the same is to be performed or carried into practice I declare
that what I claim is :-
1-Supplying heated air to steam generating and other furnaces, by means of
one or more air tubes passing over the fire and provided with nozzles constructed to
spread the expelled stream of air laterally, and across the heated gases and flame
from the fire, substantially as hereinbefore described and with reference to the
annexed drawings.
2-In supplying heated air to the furnaces of steam generating and other furnaces
the combination of a steam jet H, an air tube A, fixed under the crown of flue above
the firebars, and a nozzle constructed to spread the blast of air as it is expelled
therefrom, laterally across the flame and heated gases from the fuel, substantially
as hereinbefore described and having reference to the annexed sheet of drawings.
Dated the 16th day of September 1892.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.