AN IMPROVE MENT IN APPARATUS FOR SUPPLYING AIR IN STREAMS TO FURNACES
Year: 1858

page_text: LETTERS PATENT to Daniel Evans, of 15, Railway Terrace, New Town,
Stratford, in the County of Essex, for the Invention of "AN IMPROVE
MENT IN APPARATUS FOR SUPPLYING AIR IN STREAMS TO FURNACES."
Sealed the 10th September 1858, and dated the 19th March 1858.
PROVISIONAL SPECIFICATION left by the said Daniel Evans at the
Office of the Commissioners of Patents, with his Petition, on the
19th March 1858.
I, DANIEL EVANS, of 15, Railway Terrace, New Town, Stratford, in the
County of Essex, do hereby declare the nature of the Invention for "AN
IMPROVEMENT IN APPARATUS FOR SUPPLYING AIR IN STREAMS TO FURNACES," to be
as follows:-
This Invention has for its object an improvement in apparatus for supplying
air in streams to furnaces. For this purpose perforated tubes are used, and
each of such tubes is made double in order that there may be a space or
compartment for water between the two tubes. The air passes into the interior
of the double tube, and out laterally through small holes or openings made
through the inner and outer tubes, and the space between the inner and outer
tubes containing water is either to form part of the capacity of a steam boiler,
Price S1

page_text: By
or else be the means of heating water circulated through the tubes.
thus supplying air through tubes surrounded by water, such tubes can be
introduced and used in parts of furnaces which are very highly heated. When
desired, heated steam may be passed through some of the perforated tubes.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Daniel Evans in the Great Seal Patent Office on the
18th September 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, DANIEL
EVANS, of 15, Railway Terrace, New Town, Stratford, in the County of Essex,
send greeting.
.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Nineteenth day of March, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-first year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Daniel Evans, Her special licence that I, the said Daniel Evans,
my executors, administrators, and assigns, or such others as I, the said
Daniel Evans, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make, use, exer-
cise, and vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "AN IMPROVEMENT IN
APPARATUS FOR SUPPLYING AIR IN STREAMS TO FURNACES,' upon the condition
(amongst others) that I, the said Daniel Evans, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that, I, the said Daniel Evans, do hereby declare the
nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
This Invention has for its object an improvement in apparatus for supplying
air in streams to furnaces. For this purpose perforated tubes are used, and
each of such tubes is made double in order that there may be a space or
compartment for water between the two tubes. The air passes into the interior

page_text: of the double tube, and out laterally through small holes or openings made
thro' the inner and outer tubes, and the space between the inner and outer
tubes containing water, is either to form part of the capacity of a steam
boiler, or else be the means of heating water circulated through the tubes.
By thus supplying air through tubes surrounded by water, such tubes can be
introduced and used in parts of furnaces which are very highly heated.
When desired, heated steam may be passed through some of the perforated
tubes.
Having thus stated the nature of my said Invention, I will proceed to
describe the manner of performing the same.
DESCRIPTION OF THE DRAWING
Figure 1 shows a vertical section of the fire box of a locomotive steam
engine boiler having apparatus applied thereto for supplying air to the furnace
according to my Invention; Figure 2 shows a transverse section of the parts
shown in Figure 1; and Figure 3 shows a horizontal section of the same parts.
In the arrangement shown, provision is made for having two fires in the furnace
one higher than the other, to which, however, I make no claim; one fire is on
the lower part of the fire box at a, a, a, and the fuel is fed thereto thro' the
door way b. The other fire is formed on the hollow shelf c, c, which is con-
structed in a similar manner to what was described in the Specification of a
former Patent granted to me, and such hollow shelf c, c, is used in place of
fire bars, and is suitable for supporting a fire made thereon; d is a water tube
thro' which the water circulates from the shelf c. Fuel is supplied to the
fire on the shelf c through the doorway d; in order to supply air to the pro-
ducts rising from the fires at a and at c, air tubes or pipes (e) are used, each
formed with numerous outlets e¹, for the passage of air above the fuel in the
fires in the furnace. The peculiarity of my Invention consists in so applying
air tubes or pipes that they shall be protected from great heat, although they
are each arranged to introduce numerous streams of air within a furnace so as
to combine with the products rising from the ignited fuel below them, and such
protection is afforded to such air tubes or pipes by their being surrounded or
parily surrounded by water spaces. The forms of the air tubes or pipes may
be greatly varied, and so may the water spaces which surround or partly
surround them, and such variations will somewhat depend on the constructions
of boilers to which my Invention is to be applied. I have therefore in addition
to the arrangement of apparatus shown in Figures 1, 2, and 3, shown other
arrangements which, together with the description thereof hereafter given, will
enable a workman readily to apply my improvements to other constructions of

page_text: steam boiler furnaces, and also to vary the forms of air pipes and water spaces
according to the effect he wishes to produce in any boiler furnace to which he is
desirous to apply my improvements. e, e, are air tubes, each having numerous
outlets e, e¹, which may be fixed through the metal of the water spaces into
the air tubes by screws or otherwise. The streams of air are indicated by the
arrows passing through the air passages e¹, e¹. Figure 4 shows a vertical
section, and Figure 5 vertical transverse section of the fire box of another
locomotive steam engine boiler having apparatus applied thereto for supplying
numerous streams of air according to my Invention to the products arising
from the fire situated below on a grating at a, a, and there is also apparatus
applied for supplying jets of steam to the products rising from the fire below.
e is an air tube having a valve or damper e, which can be kept more or less
open according to the quantity of air it is considered desirable to admit into
the furnace; e, e¹, are the air passages. The air tube e is surrounded by a
water space as is shown; f is a steam tube which passes through or is sur-
rounded by a water space, from this steam tube numerous jet tubes f conduct
the steam to the products rising from the fire below. Figure 6 shows a vertical
section, and Figure 7 shows a vertical transverse section of the fire box of
another locomotive steam engine boiler having apparatus applied thereto for
supplying air to the furnace according to my Invention. In this arrangement
the fire is divided by a water space running transversely across the furnace,
which water space by preference is higher at the sides than at the middle as is
shown. Through this water space an air tube e passes, to which passages e¹, e',
for dividing the air into numerous jets are applied, so as to introduce numerous
jets of air to the furnace above the fire therein, and in a suitable manner for
mixing with the products as they rise from the fire below. In addition to the
above streams or jets of air there are other streams or jets of air introduced by
a tube e, passed through the boiler on the inside of a tubular water space fixed
transversely across the fire box in an inclined direction above the fire, and this
tube c has also numerous jet tubes e¹, e', as shown. Figure 8 shows a longi-
tudinal section of a steam boiler where the furnace is constructed within an
internal tube; Figure 9 shows a transverse section taken partly across the
line A, B, and partly across the line C, D, in Figure 8. In this arrangement
the furnace is divided by two transverse water ways e³, e, having an air tube
between them, or if preferred these transverse water ways may be constructed
in a similar manner to that shown in Figures 6 and 7, where the furnace is
also divided as above described by a water way having an air tube through or
within it with numerous jet tubes e¹, e¹. At the back end of the furnace in
Figures 8 and 9 is another water way forming the bridge, and there is an air

page_text: ube e therein with numerous jet passages e¹, e¹, by which streams or jets of
air may be supplied to the products as they rise from the fire.
Having thus described the nature of my Invention, and the manner of per-
forming the same, I would have it understood that what I claim is, the appli-
cation of streams or jets of air and of steam into furnaces by apparatus such
as herein described.
In witness whereof, I, the said Daniel Evans, have hereunto set my hand
and seal, this Seventeenth day of September, in the year of our Lord
One thousand eight hundred and fifty-eight.
DANIEL EVANS. (L.S.)