Improvements in or Applicable to Steam Boiler and other Furnaces..
Year: 1889

page_text: Date of Application, 31st Oct., 1889
Complete Specification Left, 28th May, 1890-Accepted, 5th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in or Applicable to Steam Boiler and other Furnaces..
I JOHN WHITTLE of 107 Walshaw Road, Elton, Bury in the County of Lancaster,
Engineer do hereby declare the nature of my said invention to be as follows:-
:-
These improvements refer to an invention for which Letters Patent No. 14593 were
granted to me on the 5th Nov. 1884 and consist in the employing an air inlet pipe
surrounding my original steam nozzle.
In my original invention I employed a steam nozzle the point of which was
deflected, downwards to prevent the steam playing direct upon the crown of the
furnace and was so arranged to spread the steam more evenly over the entire interior
of the heating chamber and to distribute the oxygen evenly all over the surface
of the fire.
I now surround my improved steam jet or nozzle which ts tapered down to a
narrow orifice at the outlet, with an air supply pipe the outlet of which is similarly
deflected downwards and extends about three inches beyond the diminished mouth of
the steam nozzle. In this manner I induce a strong current of atmospheric air to
enter the furnace, along with the steam jet and thus by the improved combination of
steam and air jets I am enabled to introduce more air than has hitherto been
practicable and thus I considerably increase the draught and vacuum in the furnace.
and causing the flame to, lap with great heating effects around the crown of the flues-
the large, volume of oxygen admitted and water gas produced by its admixture with
the steam and its intimately mixing with the carbon and burning the same within the
furnace the effects of the perfect combustion so obtained are that little if any
unconsumed carbon escapes into the chimney.
The air inlet tube outside the furnace is bent upwards as an elbow and gradually
widens outwards towards the inlet in order to lessen the noise created by the great
inrush of air and near the bend I fit the same with a (by preference) sliding dainper
to shut off the air, supply as desired.
The improvements are equally applicable to other furnaces where a steam supply*
"
COMPLETE SPECIFICATION.
Improvements in or Applicable to Steam Boiler and other Furnaces.
I, JOHN. WHITTLE of 107, Walshaw Road, Bury, in the County of Lancaster,
Engineer do hereby. declare the nature of my said invention and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement :-
:-
These improvements refer to an invention for which Letters Patent No. 14593
were granted to me on the 5th day of November 1884 and consist in employing an
air inlet pipe surrounding my original steam nozzle as hereinafter described.
In my original invention I employ a steam nozzle the point. of which was deflected
downwards to prevent the steam playing direct upon the crown of the furnace and
was so arranged to spread the steam throughout the entire interior of the heating.
chamber and to distribute the oxygen more evenly all over the surface of the fire.
I now surround my improved steam jet or nozzle which is tapered down to a narrow'
orifice at the outlet, with an air supply, pipe, the outlet of, which is similarly deflected

page_text: downwards as hereinafter described and extends about three inches beyond the
diminished mouth of the steam nozzle.
On the accompanying drawing Fig. 1 represents a front view and Fig. 2 a side
sectional view of a double-flued steam boiler having my improvements applied.
Fig. represents a side sectional view and Fig 4 an exterior plan view of the
combined steam and air nozzles constituting the essential feature of my invention.
As in my previous Patent I still affix my "improved form of pipe" or steam
nozzle a inside the furnace b and centrally over the furnace door c with its point
deflected downwards and taking the steam supply for feeding the same from the steam
space in the boiler or from a steam pipe or other convenient source.
In accordance with my present improvements I surround the outside of the
steam nozzle a which is tapered down to a narrow orifice at the outlet with an air
nozzled the outlet d' of which (shaped as illustrated in sectional view Fig. 5 or
of any analogous form) is similarly deflected downwards to the steam nozzle a
(see Fig. 3) and extends about three inches beyond the mouth or outlet of the said
stean nozzle. This air nozzle d outside the boiler is connected to or formed as an
elbow d² and receives its supply of air through a pipe d³ from any convenient
part of the boiler house in which case I prefer to have the inlet end c of such
pipe situated at the back of the boiler in order to lessen perception of the noise
created by the great inrush of air therethrough into the furnace (the pipe d³ passing
through the side-flue of the boiler if it be desired to heat the air supply) or the
said air pipe may be carried outside or into any adjacent part of the premises and
in some cases where required may be utilised for ventilating purposes.
In this
manner I induce a strong current of atmospheric air to enter the furnace along with
the steam jet and at the same time I considerably increase the draught and vacuum
in the furnace, the large volume of oxygen admitted (and water gas produced by.
its admixture with the steam) and its intimately mixing with the carbon and burning
the same within the furnace, the effects of the more perfect combustion so obtained
are that little if any unconsumed carbon escapes into the chimney and the flame
produced is caused to lap with great heating effect around the crown of the flues.
I regulate the quantity of air passing through the air pipe d by a swivelling
throttle damper 9 or any equivalent controlling apparatus.
In Figs. 3 and 4 I have illustrated the best position and angle which experience
dictates for placing the point or exit of the steam jet a into the air nozzle d so as to
ensure the greatest possible induction of air and this together with the peculiar form
and combination of the two nozzles giving as they do, an equal combustion
throughout the entire interior of the heating chamber I consider to be the essential
features of my present invention.
My improved apparatus is specially applicable to marine boilers in which I have
hitherto found it necessary (in using my original steam nozzle alone in a boiler with
a solid door) to slightly open the furnace door to admit the necessary extra quantity
of oxygen above the fuel and which at the same time has tended to cool the furnace.
I now find that by the addition of my improved air nozzle with the air pipe taking.
its supply by preference direct from the stoke-hold that the necessity of opening the
furnace door is avoided and I obtain an improved consumption within the furnace.
Although only herein before described and illustrated as applied to steam boiler
furnaces the improvements are equally applicable to other furnaces where a steam!
supply is available.
:
I wish it to be distinctly understood that I make no claim berein to the introduc-
tion of air and steam in combination to a steam boiler or other furnace save and
except by the improved arrangement of steam and air jet apparatus herein before
described and illustrated.
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 :-
1st. The improved combination and lumea rin at in int
4.
annonatra

page_text: applied to a steam boiler or other furnace substantially as and for the purposes
herein before described and illustrated on the accompanying drawing.
2nd. In a.steam boiler or other furnace the employment of a steam jet or nozzle in
combination with a surrounding air nozzle both deflected downwards at their outlets
and supplied with steam and air substantially as and for the purposes hereinbefore
described and illustrated on the accompanying drawing.
10:1
C
1000
JOHN G. WILSON,
Agent for Applicant.