and Distributing such Coal and like Fuel.
Year: 1884

page_text: and Distributing such Coal and like Fuel.
We, FREDERICK JOHN PICKERING CHEESBROUGH and ERNEST RICHARD ROYSTON,
both of 15 Water Street, Liverpool in the County of Lancaster, Engineers, do
hereby declare the nature of our said Invention for AN IMPROVED SYSTEM AND
MEANS OF BURNING COAL AND LIKE FUEL IN FURNACES AND APPARATUS EMPLOYED
THEREIN FOR SUPPLYING AND DISTRIBUTING SUCH COAL AND LIKE FUEL to be as
follows:-
Our Invention has for its object improvements in burning coal, or like fuel in
furnaces and consists of a certain improved manner, or method of supplying and
distributing fuel to furnaces and certain means of burning the fuel so supplied;
and certain improved construction of apparatus for effecting such supply and
distribution of the fuel as hereinafter described.
According to our Invention we feed the fuel to the furnace (hereinafter described)
by, continuously, or at short intervals, sprinkling fresh fuel which has previously
been brought to, or is in a small condition, such as what is known as slack coal, or
the fuel may be crushed, or pulverized coal. The fresh fuel is sprinkled, or spread
in as far as possible in, or into regular thin, or small regular quantities on to
successive portions of incandescent fuel on a moving grate (hereafter described)
a forced undergrate draught being supplied (in the manner hereafter described)
The fuel on the grate is kept at what is termed a thin fire.
The means which we employ in carrying out the above described method is a
rotating grate, such as a horizontal disc grate operated by mechanical means and
a supplying device (hereinafter described) which uniformly sprinkles the small, or
crushed fresh fuel at a certain point, or points on to the incandescent fuel as it
passes such point, or points.
The apparatus according to our invention is constructed in manner as follows.
The furnace fire grate consists of a horizontal platform provided with apertures
for the passage of air and may take the form of a disc, composed of perforated
metal plates, or perforated slabs, or fire-bricks. This disc is supported on
suitable framework and rotates on a central standard, or on
&
runners and is
rotated by toothed gear, such as a worm and wheel, or spur wheel gear, which
n

page_text: is operated by an engine. The periphery of the disc is provided with a rim, or
rims on one, or both sides to keep the fuel on the grate and to prevent the escape
of air past the edges. A chamber is positioned below the grate, which is closed
by a suitable door and into which there is supplied a forced draught of air, obtained
preferably by a steam injector, or blower. Positioned over the grate and preferably
in front of the grate there is a hopper, or box, the lower part of which is provided
with a shoot which extends across, preferably radially) over a portion, or portions
of the fire grate.
"
The hopper, or box, or the shoot is provided with a mechanical device for passing
the fuel therethrough; the device may take the form of a worm," or serrated
barrel, an endless band, or scraper, or like device, the device being conveniently
rotated, or otherwise operated by gearing from the engine before mentioned which
operates the grate. Provision is made for supplying a certain quantity of air
above the fuel to complete combustion by providing openings, or passages from
the chamber below the grate, at the edge, or centre, or through a duct above the
fuel. In some cases to spread the fuel uniformly over the grate we provide a bar,
or rake at a given height above the grate, so that as the grate rotates the bar
spreads the fresh fuel uniformly over the passing incandescent fuel and keeps the
fire at a regular level, or thickness. A door is provided in the front of the furnace
to permit of access to the furnace.
The mode of operation of burning the fuel is as follows. Presuming a fire to
have been brought to an incandescent state on the grate and the fire to be working
under the forced draught. The grate is rotated and fresh fuel is fed from the
hopper through the shoot in a fine shower and supplied or sprinkled, or spread over
the the incandescent fuel on the grate as it passes the shoot. By the means and
apparatus we employ, a thin and level fire is mechanically maintained over the
grate and by the use of this fire and maintained mechanically in this condition
by sprinkling, or spreading the fresh supply in a fine shower, or supply over
successive portions of the incandescent fire and subjecting the fire to a forced
draught and supply of air, a perfect combustion of fuel is obtained entirely by
mechanical means the hoppers being fed periodically.
Our Invention is particularly applicable to furnaces for steam generators,
evaporating pans re-heating furnaces and analagous furnaces.

page_text: in Furnaces, and Apparatus Employed therein for Supplying
and Distributing such Coal and like Fuel.
We, FREDERICK JOHN PICKERING CHEESBROUGH and ERNEST RICHARD ROYSTON,
both of 15 Water Street, Liverpool, in the County of Lancaster, Engineers do
hereby declare the nature of our said Invention for AN IMPROVED SYSTEM
AND MEANS OF BURNING COALS AND LIKE FUEL IN FURNACES AND APPARATUS
EMPLOYED THEREIN FOR SUPPLYING AND DISTRIBUTING SUCH COAL AND LIKE
FUEL, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
Our Invention has for its object improvements in burning coal, or like fuel in
furnaces and consists of a certain improved manner, or method of supplying and
distributing fuel to furnaces, and certain means of burning the fuel so supplied;
and certain improved construction of apparatus for effecting such supply and
distribution of the fuel as hereinafter described.
According to our Invention we feed the fuel to the furnace (hereinafter described)
by continuously, or at short intervals sprinkling fresh fuel, which has previously
been brought to, or is in a small condition, such as what is known as slack coal, or
the fuel may be crushed, or pulverized coal. The fresh fuel is sprinkled, or spread
as far as possible, in, or into regular thin, or small regular quantities onto successive
portions of incandescent fuel on a moving grate (hereafter described) a forced under-
grate draught being supplied (in the manner hereafter described). The fuel on the
grate is kept at what is termed a thin fire.
The means which we employ in carrying out the above described method, is a
rotating grate, such as a horizontal disc grate operated by mechanical means, and
a supplying device (hereinafter described) which uniformly sprinkles the small, or
crushed fresh fuel at a certain point, or points onto the incandescent fuel as it
passes such point, or points.
The apparatus according to our Invention is constructed in manner as follows
The furnace fire grate consists of a horizontal platform provided with apertures
for the passage of air and may take the form of a disc, composed of perforated
metal plates, or perforated slabs, or fire-bricks. This disc is supported on a suitable
framework and rotates on a central standard or on runners and is rotated by
toothed gear, such as a worm and wheel, or spur wheel gear which is operated
by an engine. The periphery of the disc is provided with a rim, or rims on one,
or both sides to keep the fuel on the grate and to prevent the escape of air past
the edges. A chamber is positioned below the grate, which is closed by a suitable
door and into which there is supplied a forced draught of air, obtained preferably
by a steam injector, or blower. Positioned over the grate and preferably in front

page_text: of the grate there is a hopper, or box the lower part of which is provided with a
shoot, which extends across, preferably radially, over a portion, or portions of the
fire grate.
«
"
The hopper, or box, or the shoot is provided with a mechanical device for passing
the fuel therethrough; the device may take the form of a worm or serrated
barrel, an endless band, or scraper, or like device, the device being conveniently
rotated, or otherwise operated by gearing from the engine before mentioned which
operates the grate. Provision is made for supplying a certain quantity of air above
the fuel to complete combustion by providing openings, or passages from the
chamber below the grate, at the edge, or contre, or through a duct above the fuel.
-In some cases to spread the fuel uniformly over the grate, we provide a bar, or
rake at a given height above the grate, so that as the grate rotates, the bar spreads
the fresh fuel uniformly over the passing incandescent fuel and keeps the fire at a
regular level or thickness. A door is provided in the front of the furnace to permit
of access to the furnace.
The mode of operation of burning the fuel is as follows: Presuming a fire to
have been brought to an incandescent state on the grate and the fire to be working
under the forced draught. The grate is rotated and fresh fuel is fed from the
hopper through the shoot in a fine shower and supplied, or sprinkled, or spread
over the incandescent fuel on the grate as it passes the shoot. By the means and
apparatus we employ, a thin and level fire is mechanically maintained over the
grate, and by the use of this fire and maintained mechanically in this condition
by sprinkling, or spreading the fresh supply in a fine shower, or supply over
successive portions of the incandescent fire and subjecting the fire to a forced
draught and supply of air, a perfect combustion of fuel is obtained entirely by
mechanical means, the hoppers being fed periodically.
Our Invention is particularly applicable to furnaces for steam generators,
evaporating pans, re-heating furnaces and analogous furnaces.
In order that our Invention may be more clearly understood, and to enable
those skilled in the art to put the same into practice we have hereunto annexed
two sheets of Drawings illustrative of our Invention and showing the application
of our Invention to a steam generator and to an evaporating pan. The Drawings
are marked with letters and figures of reference corresponding with those used
in the following explanation, like letters and figures being used to denote the same
or corresponding parts throughout the various views and figures.

page_text: The apparatus is constructed in manner as follows. The furnace fire grate,
consists of a horizontal platform A the face of which is formed of plates A¹ which
are provided with apertures, or holes a (see Figure 5) for the passage of air. The
platform A is of circular form and rotates on a central support B and is carried by
wheels, or runners C which bear on a circular rail D. The upper portion of the
platform A is dished and the lower portion is provided with a cylindrical ring E
to which the runners C are attached. The lower portion of the ring E works in a
luted recess F. Round the platform A there is provided a toothed wheel H into
which gears a toothed pinion J, which latter serves to give the rotary motion to
the platform A power being applied from a driving shaft I through the pinions K
and L and the shaft M. The furnace fire grate A just described is set in suitable
masonry under the evaporating pan G as shown at Figure 4. Below the fire
grate A there is provided a closed chamber N, the fire grate forming the top, or
cover thereof, the only exit from the chamber N being through the holes a in the
fire grate. The chamber N is provided with a door O for the removal of ashes
and it is also provided with a duct P through which the chamber N is supplied
with a forced draught of air attained preferably by a steam injector, or blower,
such as a "Korting Undergrate Blower P. Suitable doors QR are provided for
examination of the fire grate A and the furnace S.
Positioned over the fire grate A there is a hopper, or box T, the lower part of
which enters the furnace S and extends radially over a portion of the fire grate A.
The part of the hopper, box, or shoot T which enters the furnace S is water or air
jacketted and is of section such as shown at Figure 8. The shoot T is mounted
with a suitable supply casing and is provided with a worm U which is rotated in
the shoot T by the wheel and worm gear V which receives motion from the driving
shaft I. The function of this worm is to feed the fuel which is preferably of a
slack, or small nature along that part of the shoot which enters the furnace, the
fuel as it is fed forward escapes over the lip T' of the shoot T and falls through
the space T2 of the shoot T onto the furnace fire grate A, as the fire grate A rotates,
thus feeding the fuel uniformly over the fire grate A.
In reference to Figures 1. 2 and 3, it will be seen that the furnace fire grate
and feeding device just described are shown applied to a steam generator of the
locomotive type. In this case instead of the apparatus being set in masonry, it is
set in a metal casing.
It will be evident that although we have only shown two examples of the
application of our Invention, that it can be applied to various purposes analogous
to those illustrated.
The mode of operation is as follows. Presuming a fire to have been brought to
an incandescent state on the grate A and a forced draught of air be supplied to the
chamber N through the duct P, the fresh fuel is fed through the shoot T and falls
over the lip T onto the incandescent fuel on the grate A as it passes the shoot,
thus a thin level fire is mechanically maintained over the grate A, which is
subjected to a forced draught of air through the holes a from the chamber N and
a perfect and smokeless combustion of the fuel takes place.
Having now particularly described the nature of our said Invention and in
what manner the same is to be performed we declare that what we claim is
First. The method herein described of burning fuel, which method consists of
supplying fuel mechanically and evenly in a small state onto a moving bed of
incandescent fuel substantially as and for the purposes set forth.
Second. The means herein described of supplying fuel in a small state onto a
moving bed of incandescent fuel consisting of a rotating grate and a worm feeding
device operating substantially as and for the purposes set forth.
Third. The combination of a worm (such as U) and box (such as T) substantially
as set forth and operating as and for the purposes described.

page_text: Fourth. The bed, or platform constructed and operating substantially as and for
the purposes set forth.
Fifth. The general arrangement and construction of parts substantially as set
forth with reference to Figures 4 to 8 of the Drawings.
Sixth. The general arrangement and construction of parts, substantially as set 5
forth with reference to Figures 1 to 3 of the Drawings.