Improved Apparatus for the Prevention of Smoke in Boiler or other Furnaces.
Year: 1890

page_text: Date of Application, 30th May, 1890
Complete Specification Left, 2nd Mar., 1891-Accepted, 4th Apr., 1891
Improved Apparatus for the Prevention of Smoke in Boiler or
other Furnaces.
1, SAMUEL KING BARNES, of 99, Falmouth Road, New Kent Road, in the
County of London, S.E., Engineer, do hereby declare the nature of the said invention
to be as follows:-
-
My invention relates to apparatus to be applied to boiler or other furnaces for
the prevention of smoke where "slack" or small bituminous coal is used as fuel, and
consists of an induction apparatus whereby heated air is injected over the top of
the furnace by a dry steam jet.
To carry my invention into effect I apply to the inner side of a furnace front an
arched pipe of which the two lower ends are brought through the furnace dead
plate and turned outwards as air supply inlets.
At the top of the arched pipe or at any convenient point or points I introduce
one or more steam pipes taken from any convenient part of the steam space of the
boiler into an injection jet piece or pieces placed horizontally under the crown of
the furnace and tending to force a combined jet of air and steam over the furnace
towards the bridge.
In the construction of this injector nozzle I taper down the steam jet to an orifice
of small dimensions and also taper in the sides of the walls of the injector nozzle to
a narrow throat where the steam meets the air afterwards expanding and preferably
flattening the orifice for the escape of the mixed air and steain.
The steam supply pipe is controlled by a screw down valve and by an opening
and closing throttle valve.
Owing to the air inlet pipes being placed inside the furnace front the air will
have become considerably heated by passing through the hot pipes before mixing
with the steam which it will thus thoroughly dry, and before injection over the
furnace.
The presence thus in excess of heated air above the grate will thus serve to
consume any smoke that might be formed from the fuel upon the grate and more
perfect smokeless combustion will be the result.
Dated this 27th day of May 1890.
FELL & WILDING,
1, Queen Victoria Street, Agents for the Applicant.
1
COMPLETE SPECIFICATION.
Improved Apparatus for the Prevention of Smoke in Boiler or
other Furnaces.
I, SAMUEL KING BARNES, of 69, Falmouth Road, in the County of London,
S.E., Engineer, 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 :-
My invention relates to apparatus to be applied to boiler or other furnaces for
the prevention of smoke where slack or small bituminous coal is used as fuel, and
consists in an induction apparatus whereby heated air is injected over the top of
the furnace by a dry steam jct.
And in order that my invention may be the better understood I now proceed to
describe the same in relation to the drawings hereunto annexed reference being had
to the letters and figures marked thereon.

page_text: Fig. 1 represents a front view of a boiler furnace with dry steam jet applied
thereto.
Fig. 2 is an elevation of the furnace with the front removed showing the air-
tubes.
Fig. 3 is a longitudinal section of the furnace showing my apparatus in place.
I apply to the inner side of the furnace front an arched pipe C of which the two
lower ends D are brought through the furnace dead plate, and turned outwards as
air supply inlets.
At the top of the arched pipe C, or at any convenient point or points I introduce
one or more steam pipes B taken from any convenient part of the steam space of
the boiler A into an injector jet piece or pieces E, placed horizontally under the
crown of the furnace I, tending to force a combined jet of air and steam over the
furnace towards the bridge H.
In the construction of this injector nozzle E I taper down the steam jet to an
orifice of small dimensions, and also taper in the sides of the walls e of the injector
nozzle E to a narrow throat where the steam meets the air afterwards extending
and preferably flattening the orifice for the escape of the mixed air and steam.
The steam supply pipe is controlled by a screw down valve K and by an opening
and closing throttle valve L which may be regulated to any required volume
of jet.
Owing to the air inlet pipe C D, being placed inside the furnace front, the air
will have become considerably heated by passing through the hot pipes C D before
mixing with the steam from the steam pipe B. The steam will thus be thoroughly
dried before injection together with the air over the furnace.
The presence of an excess of heated air above the grate, so obtained, will thus
serve to consume any smoke that might be formed from the fuel from the grate, and
more perfect smokeless combustion will be the result. By the manipulation of the
throttle valve L the induced air blast may be made less or more according to the
requirements of the furnace.
The action of this jet also is to induce a better flow of air through the fire bars
in addition to the natural draught, which will therefore tend to give a better fire
with slack or small bituminous coal, than with an ordinary draught, and will consc-
quently tend to raise the rate of combustion of fuel per square foot of area of grate,
and to keep up a better evaporation.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
First. The combination with induction air tubes placed within the furnace front
of an injection nozzle or nozzles fed with dry steam controlled by a regulating
throttle valve and stop valve from the steam space of boiler substantially as
described.
Second. The specific arrangement and combination of parts of the air injection
apparatus substantially as described in reference to the drawings hereto annexed
for the combustion of smoke in boiler or other furnaces.
Dated this 2nd day of March 1891.
FELL & WILDING,
1, Queen Victoria Street, E.C., Agents for the Applicant