IMPROVEMENTS IN APPARATUS FOR ECONOMISING FUEL IN THE GENERATION OF STEAM
Year: 1874

page_text: LETTERS PATENT to Frederic Jolly, of Horwich, in the County of
Lancaster, Bleacher, for the Invention of "IMPROVEMENTS IN
APPARATUS FOR ECONOMISING FUEL IN THE GENERATION OF STEAM,"
Sealed the 18th September 1874, and dated the 11th July 1874.

page_text: My improvements consist in making boilers with pipes passing
through the outer shell and into the internal flue containing the furnace,
which is made with or without grate bars. Heated air drawn by a fan
from the flue leading from the boiler to the chimney is forced by the fan
into or above or below the fire through the said pipes. In addition to
the heated air I also force a certain amount of fresh air into the fire to
improve the combustion of the fuel. The quantity of fresh air admitted
is regulated by dampers.
My improved apparatus consists also of one or more tubes placed in
the flue leading from the boiler to the chimney, or in the chimney, or
partly in both, or in a chamber connected to the flue. These tubes are
open to the atmosphere at one end, and a draught is produced in them
by a fan. The fresh air is heated in passing through the tubes, and
when mixed with the heated air from the flue, and with or without the
cold air, it is forced by the fan into the closed space under or above the
fire-grate or into side flues connected by pipes to the furnace, as above
described.
The above arrangements of apparatus for forcing heated and fresh ai
into the furnace must be varied accordingly to the peculiar construction
of steam boiler to which my improvements are applied.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Frederic Jolly in the Great Seal Patent Office on
the 9th January 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FREDERIC
TO ALL TO T
JOLLY, of Horwich, in the County of Lancaster, Bleacher, send greeting. 2
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent bearing date the Eleventh day of July, in the year
of our Lord One thousand eight hundred and seventy-four, in the thirty-
eighth year
of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Frederic Jolly, Her special license
that I, the said Frederic Jolly, my executors, administrators, and
assigns, or such others as I, the said Frederic Jolly, 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

page_text: ,,
term therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN APPARATUS FOR ECONOMISING FUEL IN THE GENERATION OF STEAM," upon
5 the condition (amongst others) that I, the said Frederic Jolly, my
executors or administrators, 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
10 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 Frederic Jolly, 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
15 following statement (that is to say) :-
20
20
My Invention consists in certain improvements in the construction of
steam boilers, and in improved modes of heating air, and supplying it to
the furnaces of steam boilers, whereby the combustion of the fuel is
improved, and a great saving in fuel is effected.
And in order that my Invention may be fully understood and readily
carried into operation I will proceed to describe the accompanying two
Sheets of Drawings, reference being had to the figures and letters
marked thereon.
On Sheet 1 Fig. 1 represents a sectional elevation of an ordinary one-
25 flued cylindrical boiler constructed according to my improvements. In
this case the fire is kindled in the internal flue a, and the compressed
heated, or other air for supporting and promoting the combustion of the
fuel is supplied through the side pipes 6 placed in the upper part of th
There is a bridge in the flue a at the usual distance from
side flues c.
30 the front of the boiler, and between the bridge and the front are place
the diagonal pipes d, the upper ends of which pass through the oute
shell of the boiler, and are connected to the side pipes b, and the low
The pipes d are placed abou
ends are rivetted in the internal flue a.
twelve inches apart, or more or less. The mode of heating and supplyin
35 heated or other air to the side pipes and diagonal pipes d will
described hereafter in reference to Sheet 2.

page_text: Fig. 2 represents an end view, and Fig. 3 a longitudinal section
improvements are applied. The ordinary grate bars are removed from
through an ordinary double flued cylindrical boiler, to which my
the flues a, and in lieu thereof I employ the narrow grate bars or per-
forated plates e, which are placed crosswise of the flues. These narrow 5
grate bars are near the bottoms of the flues to increase the surface of the
flues exposed to the intense heat of the fire. The heated or other air is
forced into the space between the under side of the grate bars e and the
flue a through the pipes f, which are in communication with the apparatus
for supplying it, and which will be described hereafter: The pipes fare l
turned up under the bridge, and communicate with the pipes d, which
pass through the outer shell of the boiler and through the under side of
the flues a, as shewn in Fig. 3, and enter the flues a below the bridge.
The air is by this means forced under the grate bar, and penetrates
between them to the fuel. The front end of the flues is closed by the 1
usual front plate of the boiler.
Fig. 4 represents a modification of my improvements in steam boilers.
In this case the ordinary grate bars are dispensed with, and the fire is
laid partly on the bottom of the flues a, and partly on the perforated
pipes g, which extend from the bridge to the front of the boiler. Heated 2
or other air is supplied to the pipes f, which are turned up into the
pipes d, as shewn in Fig. 3, and the air is forced into the perforated
pipes g in the same manner as it is forced under the grates e, described
in reference to Fig. 3. The compressed air escaping through the per-
forations in the pipes y causes a rapid and perfect combustion of the fuel,
thereby preventing smoke and generating steam economically. The front
ends of the pipes g are closed with doors to facilitate the clearing out of
the cinders.
I
Fig. 5 is an end view of an ordinary two-flued boiler to which my
improvements are applied. The pipes fare placed under the fire-grate h,
and the front end of the ash-pit is closed, so that the compressed air
supplied to the pipes is forced between the grate bars, and effects a
perfect combustion of the fuel. There is a door in the closed end of the
ash-pit for clearing out the cinders.
Fig. 6 is an end view of an ordinary French boiler to which my
improvements are applied. The pipes f are placed in the ash-pit, and
the compressed air is suppliod, as in Fig. 5, to the under side of the fire-
grate h.

page_text: Having thus stated the nature of my Invention, and described several
modes of carrying the same into operation, I wish it to be understood
that I do not limit myself to the details given, as the apparatus for
forcing heated and fresh air into the furnace may be varied according
to the peculiar construction of steam boiler to which my improvements 5
1.
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