CERTAIN IMPROVEMENTS IN GRATE-BARS TO BE USED IN FURNACES FOR BURNING WET OR DRY FUEL
Year: 1878

page_text: LETTERS PATENT to Alexis Godillot, of Paris, Rue Rochechouart, No. 52, Manu-
facturer, for the Invention of "CERTAIN IMPROVEMENTS IN GRATE-BARS TO BE
USED IN FURNACES FOR BURNING WET OR DRY FUEL."
Sealed the 27th September 1878, and dated the 2nd May 1878.
PROVISIONAL SPECIFICATION left by the said Alexis Godillot at the Office
of the Commissioners of Patents on the 2nd May 1878.
ALEXIS GODILLOT, of Paris, Rue Rochechouart, No. 52, Manufacturer.
"CERTAIN
IMPROVEMENTS IN GRATE-BARS TO BE USED IN FURNACES FOR BURNING WET OR
DRY FUEL."
My Invention relates to a construction of fire-grate suitable for the combustion
of fuels, such as small coal, tan, sawdust, and particularly such combustibles when
they are in a damp condition.
Usually fuels of these kinds, being fed to the fire-grate by orifices above it, accu-
mulate upon the grate in heaps, through which air cannot readily penetrate, and
consequently the combustion is imperfect.
In order to avoid these evils I form a fire-grate of pyramidal or conical form, like
a pavilion roof, with its bars sloping, and I place it at some height above the hori-
zontal bars of the grate, with its apex immediately under the feeding orifice. The
fuel as it is fed from above disperses itself over the sloping sides of the grate in a
thin layer, so that air for its combustion has free access to it through the interstices
between the sloping bars. Such portions of the fuel as slide down the slope form a
talus at the lower edge, which can be spread over the horizontal bars by a rake
introduced at the lateral fire-door, and the space under the edge of the slope permits
access for the rake to clear the sloping bars.
For feeding the fuel I find it advantageous to place at some height above the apex
of the sloping grate a feeding pipe somewhat tapering to a greater diameter down-
wards; this pipe being charged from time to time with fuel, keeps the grate
supplied, fresh portions sliding down from it as the layer on the slope becomes
consumed.

page_text: Instead of terminating the pyramidal or conical grate in an apex, it may be made
truncated, presenting a level portion at the top.
The grate is most conveniently made of pyramidal form, as, for example, in the
form of a pyramid having a hexagonal base, each sloping side being a separate panel
of bars, and these panels being fixed together by bolts at the angles.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexis Godillot in the Great Seal Patent Office on the 30th September
1878.
'
ALEXIS GODILLOT, of Paris, Rue Rochechouart, No. 52, Manufacturer. "CERTAIN
IMPROVEMENTS IN GRATE-BARS TO BE USED IN FURNACES FOR BURNING WET OR
DRY FUEL."
My Invention relates to a construction of fire-grate suitable for the combustion
of fuels, such as small coal, tan, sawdust, and the like, either in a dry or damp con-
dition, the fuel being introduced through orifices at the top of the furnace archi.
Ordinarily the fuel falls upon a horizontal grate, and accumulates in heaps or
masses, which are compressed by their own weight, and under these conditions the
air penetrates with difficulty into the middle of the mass, causing imperfect com-
bustion.
According to my present Invention this defect is obviated by the use of fire-grates
of a pyramidal or conical form, projecting up into the furnace like a pavilion roof, which
is applicable to all descriptions of furnaces in which the fuel is introduced through
orifices from the top. Such pavilion grates are placed upon the ordinary flat grates,
and receive the fuel, which slides down the inclined faces, thereby becoming more
divided, so that the air can readily penetrate throughout the mass, and the com-
bustion be thereby greatly improved.
In addition to the above I in some cases provide at the charging orifice a vertical
feeding tube, somewhat tapering towards the upper end, and constituting a reservoir
of fuel, which affords a continuous automatic feed to the furnace.
Lastly. The arrangement of the pavilion grate is such that the fireman can,
without introducing cold air into the furnace, examine the under side of the grate,
and remove the cinders collecting on the horizontal part of the grate into the ash-pit
by means of a rake.
The accompanying Drawings shew a furnace provided with my before-described
improved fire-grate.
Fig. 1 shews a longitudinal section; Fig. 2 shews a sectional plan; Fig. 3 shews
a vertical section.
The horizontal grate A of each furnace chamber has mounted upon it my improved
grate B, to which I give the name "pavilion grate," because it partakes of the form
of the roof to a pavilion; this grate is of pyramidal form, composed of several sides
B, B, B, each of which is an inclined grate. The lower edge of the pavilion grate is

page_text: a certain height above the flat grate A in order that a rake may be introduced into
the intervening space for the purpose of removing clinkers and ashes. For this
purpose a cast-iron plate C, forming the top of the side door framing D, is extended
in the form of a cover to the edge of the grate, as shewn at Fig. 3.
The bars of the grate A are omitted beneath the grate B and cover C, but so as to
leave a rim projecting beneath these, so that the descending fuel can accumulate and
form a talus. By this arrangement the fuel in burning slides down the sloping
sides B, of which the bars all lie in the direction of the greatest inclination, so that
it is never requisite to clean the grate B, the residue and cinders accumulating on
the grate A.
The pavilion grate, shewn separately to an enlarged scale in plan and vertical section
at Figs. 4 and 5, can consist of a greater or smaller number of grate panels. In the
arrangement shewn it consists of 6 triangular inclined grates converging at the apex,
the panels being only connected by screw bolts at their bases, so that they are free
to expand and contract at the upper end.
The panels may be of trapezoidal form instead of triangular, in which cases they
would form truncated pyramids.
The form of the grates would depend on the configuration of the charging orifices,
which may be round, oblong, square, or of any other form.
The feeding of the dry or damp fuel, such as tan, sawdust, and the like, is effected
through orifices G formed in the furnace arch H, but in order to obtain an automatic
continuous feed a tube I is placed over each orifice, tapering to a smaller size at
top, and serving as reservoirs for fuel, as indicated at Fig. 3.
Having thus described the nature of my said Invention, and in what manner the
same is to be performed, claim, the herein-described construction of grating, of
pyramidal, conical, or pavilion form, for use in furnaces burning small fuel, whether
dry or damp.
In witness whereof, I, the said Alexis Godillot, have hereunto set my hand
and seal, this Twenty-eighth day of September, in the year of our Lord One
thousand eight hundred and seventy-eight.
Witness.
JULES ARMENGAUD,
of Paris,
Bd. de Strasbourg, 23,
Civil Engineer.
ALEXIS GODILLOT. (L.S.)