Improved Method of and Apparatus for Supplying Hot Air, or a Mixture of Hot Air and Steam, to Boiler and other Furnaces, Stoves, or Lamps.
Year: 1895

page_text: Date of Application, 5th Mar., 1895
Complete Specification Left, 4th Dec., 1895-Accepted, 18th Jan., 1896
PROVISIONAL SPECIFICATION.
Improved Method of and Apparatus for Supplying Hot Air, or a
Mixture of Hot Air and Steam, to Boiler and other Furnaces,
Stoves, or Lamps.
I, JOHN ALVES, of No. 17 Market Buildings, Flinders Lane, Melbourne, in
the Colony of Victoria, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to the supplying of hot air or a mixture of hot air and
steam to boiler and other furnaces, stoves, or lamps, and it is applicable alike to
the furnaces of stationary, marine, and locomotive boilers as well as to gas and oil
stoves or lamps.
Its object is to enable the maximum lighting or heating effect possible to be
obtained from the fuel.
It consists in the arrangement of an outer tube or suction flue around the smoke
stack or chimney so that said Hue communicates (in the case of boiler furnaces)
with a hollow bridge piece at the back of the furnace or fire place. This outer
tube or suction flue is preferably fitted with a number of spirally arranged plates
or is otherwise formed with a spiral passage around said chinney stack so that the
air or in some cases the mixture of steam and air passing down samo will be
thoroughly mixed and heated before boiug delivered into the furnace.
The hollow bridge pieco above referred to is formed with a grating along the
front of its lower end and has a hollow perforated portion projecting forwardly into
the furnace. The bridge piece is protected with fire brick and a valve or damper
is preferably provided in any convenient position for limiting the amount of steam
and air supplied to it.
In the case of condensing engines and lamps only hot air is supplied but where
waste steam is available it is better to use it as described above.
In order to apply my invention to a lamp it is only necessary to provide an outer
and air tight gallery or chimney support outside the ordinary perforated one and
to fit it with an outer and shorter chimney so that the air used in the lamp has to
pass over the surface of the inner chimney and become heated before it is supplied
to the flame.
Dated this Twenty-ninth day of January One thousand oight hundred and
ninety-five
Improved Method of and Apparatus for Supplying Hot Air, or a
Mixture of Hot Air and Steam, to Boiler and other Furnaces,
Stoves, or Lamps.
I, JOHN ALVES, of No. 17 Market Buildings Flinders Laue; Melbourne in
the Colony of Victoria, 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:-
This invention relates to the supplying of hot air or a mixture of hot air and
steam to boiler and other furnaces, stoves or lamps, and it is applicable alike to the

page_text: In some locomotives, however, where the crank travels close up to the fire
box and there not sufficient space to admit of this arrangement, the flues C
may
ay be constructed as shown in Figs. 3 and 4; that is, they may be.extonded
right back on to the fire box, and then passed down the sides thereof, They
can be secured to the shell of tho boiler in many different ways, as, for instance,
by means of the studs or brackets which support the usual hand rails, and as
the construction of locomotives varies so largely it will be found necessary. to
alter the arrangement of the hot air supply flues to suit different constructions.
Those given and described above being merely examples, as will be readily
understood by any person who is familiar with this branch of engineering.
I prefer to provide two spiral plates a around the chimney B and to arrange
each of the passages so formed, that it will communicate with each of the
Blues C. The application of my invention to marine boilers has of course to be
altered to suit the different construction. One arrangement which might be
employed is that shown in Figs. 5 to 8, where. B, as before, represents the
chimney and A the outer tube or auction flue around it, whilst CC represent
the flues which serve to conduct the air passing down the flue A into the
furnaces E, said flues C being arranged around the ordinary smoke flues which
extend between the smoke boxes or combustion chambers of the different boilers
and the chimney belonging to each set. These said flues C may be arranged
to pass down in front of the boiler on either side thereof as shown in Fig. 8,
and to communicate with the interior of the furnaces beneath the fire bars thereof,
but as with the locomotives I would wish it to be distinctly understood that this
arrangement is only one of many that might be adopted, and is given merely by
way of example.
Where it is desired to feed steam to the furnace with the hot air I place a
hood over the top of the chimney in order to deflect the mixture of steam and
air issuing therefrom down into the annular space or suction flue A outside the
chimney.
In applying my invention to an oil lamp the arrangement shown in Fig. 9 will
be found to answer the purpose with most constructions. B represents the ordinary
chimney of said lamp, and A a globe which is closed at the bottom and is fitted
closely around the lamp beneath the gallery F so that the only air which can pass
through the openings in said gallery is that which first passes down between the
chimney B and the globe A, and as this air is thoroughly heated by the radiation
from said chimney the desired effect is produced.
The arrangement for a gas lamp as shown in Fig. 10 is practically the same,
except that I have found in practice it is not necessary for the chimney B to extend
down to the bottom of the lamp, it being merely necessary to close in the bottom of
the globe A and to support a short chimney B, by means of wire brackets b, so that
it projects down into the globe A, the effect apparently being to create a double
current of air inside the globe A; the nitrogen and burnt gases passing straight up
through the chimney B, whilst the fresh supply passes down inside the globe A and
becomes heated thereby before it reaches the flame.
In applying my invention to a gas stove, the air is preferably heated by making
the hot plate hollow over the burner E, as shown at G, and by leading the air for
the supply of the burner E through holes g into said hot plate, where it will be
thoroughly heated by the flanie froin the burner E before passing down and mixing
with the gas, so as to form a Bunsen flame, which will by this arrangement be
much more intense, and will give greater heat with a less combustion of fuel than
when the gas is burnt in the ordinary manner with cold air.
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 :
First. The herein described method of supplying hot air or a mixture of hot
air and steam to boiler and other furnaces, stoves, or lamps, consisting in first
.

page_text: closing in all apertures into the furnace, stove, or lamp, with the exception of a
passage or opening leading from around the chinney or other place where the heat
from the escaping products of combustion can first act upon it substantially as and
for the purposes herein described and explained, and as illustrated by way of
example in the accompanying, drawings.
Second. In apparatus for supplying hot air or a mixture of hot air and steam to
boiler and other furnaces, stoves, or lamps, an outer tube or suction Aue surrounding
the chimney and communicating with the furnace through another fluo or flues
substantially as and for the purposes herein described and explained, and ag
illustrated in the accompanying drawings.
Third. Iusapparatus for supplying hot air or a mixture of hot air and steam to
boiler furnaces an outer tube or flue (such as A) arranged around the outside of the
chimney and fitted with a spirally arranged plate or plates (such as a) in the
annular space between said chimney and said outer tube, said space being in open
communication with the furnace through a flue or fuos (such as C) passing along
the sides of the boiler substantially na and for the purposes herein described and
explained, and as illustrated in Figs. 1 to 4 of the accompanying drawinga.
the
Fourth. In apparatus for supplying hot air to stoves, a hot plate (such as G),
made hollow and arranged so that the flame from the furnace can act upon it;
space within said plate being in open communication with the burner substantially
as and for the purposes specified, and as illustrated in Fig. 11 of the accompanying
drawings.
Fifth. In apparatus for supplying hot air to lamps, a globe (such as A) surrounding
the chimney, closed at its lower end and fitted around the gallory of the lamp, soO
that any air passing the flame of said lamp will be forced to pass first between said
chimney and said globe substantially as and for the purposes specified, and as
illustrated in Figs. 9 and 10 of the accompanying drawings.
Sixth. In apparatus for supplying hot air to gas lamps, an outer globe (auch
as A), closed at the bottom, in combination with a chimney (such as B) projecting
down into said globe for a certain distance substantially as and for the purposes
specified, and as illustrated in Fig. 10 of the accompanying drawings.
Dated this Fifth day of October
www
WHID RE
VOLUCI
JOHN ALVES.
W. H. Beck, F.C.I.P.A.,
116 Cannon Street, London, Agent.
JOHN ALVES.
W. H. Beck, F.C.I.P.A.,
115 Cannon Street, London, Agent.