Improvements connected with Steam Generator and other analogous Furnaces.
Year: 1894

page_text: Date of Application, 20th June, 1894
Complete Specification Left, 20th Mar., 1895-Accepted, 15th June, 1895
PROVISIONAL SPECIFICATION.
Improvements connected with Steam Generator and other analogous
Furnaces.
I, JONATHAN GREEN, of Tye, Brymbo, near Wrexham, North Wales,
Engineer, do hereby declare the nature of this invention to be as follows :-
This invention has reference to the combustion of coal or like fuel in the furnaces
of steam generators, and like furnaces, and has mainly for its object to provide
means for, or a mode of, burning the fuel, that no smoke, or little, is made, and
perfect combustion effected.
According to this invention, I provide, especially in the case of tubular furnaces,
a hollow bridge or chamber at the back of the furnace, or the part where the fire
gases pass from the grate; and into and through this bridge or chamber there is
introduced and passes atmospheric air, and flame or fire gases from off the fuel,
the air being by preference admitted to said chamber through the ashpit, and the
gases by an aperture or apertures at the side or front above the level of the grate.
In some cases above these latter openings I provide a projecting part or hood by
which, and under which, such gases are conducted into the said chainber.
In operation the fire gases and air mix, the air becoming heated thereby ; and
these pass through suitable apertures in the top or upper part of the chamber, and
intermix with the gascons products of combustion from the furnace passing over
the chamber. By this the formation of smoke is prevented, and complete combustion
obtained.
Air to the chamber above referred to is controlled by a valve or damper in the
lower part thereof, and this in some cases is automatically operated, that is, opened
or closed wholly or more or less at the different stages of firing; namely, when
fresh fuel is introduced into the furnace, in the case of a hand fired steam generator,
the moving of the furnace door causes the valve or damper to be opened, and
supply a full or greater amount of air to the chamber; and after this operation,
the said valve or damper becomes shut wholly or more or less by itself, as by its
own weight (or by a positive motion), by a timing device as clockwork, or an
escapement of any suitable kind, or other suitable means.
In the case of the application of this invention to steam generators such as of
the locomotive type, I provide in front of the tube plate a partition or wall, up the
space between which, air is admitted-it being controlled by a suitable valve or
damper, while the gases of combustion from the furnace pass over the top of
same and mix with the air, and so prevent the formation of smoke, and effect
proper combustion.
The materials of which the chamber or hollow bridge, and the partition or wall,
are made, or partly made, at the parts subjected to great heat, is, by preference, a
suitable fire resisting material.
Duted this 10th day ST1001
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.

page_text: Improvements connected with Steam Generator and other analogous
Furnaces.
1, JONATHAN GREEN, of Tye, Brymbo, near Wrexham, North Wales,
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 has reference to the combustion of coal or like fuel in the furnaces
of steam generators, and like furnaces, and has mainly for its object to provide
means for, or a mode of, burning the fuel, that no smoke, or little, is made, and
perfect combustion effected.
According to this invention, I provide, especially in the case of tubular furnaces,
a hollow bridge or chamber at the back of the furnace, or the part where the tire
guses pass from the grate; and into and through the bridge or chamber there is
introduced and passes atmospheric air, and flame or fire gases from the fuel, the air
being by preference admitted to said chamber through the ashpit, and the gases by
an aperture or apertures at the side or front above the level of the grate.
In some
cases above these latter openings I provide a projecting part or hood by which and
under which, such gases are conducted into the said chamber.
In operation the fire gases and air mix, the air becoming heated thereby; and
these pass through suitable apertures in the top or upper part of the chamber,
and intermix with the gaseous products of combustion from the furnace pussing
over the chamber. By this the formation of smoke is prevented, and complete
combustion obtained.
Air to the chamber above referred to is controlled by a valve or
damper in the
lower part thereof, and this in some enses is automatically operated, that is, opened
or closed wholly or more or less at the different stages of firing; namely, when
fresh fuel is introduced into the furnee, in the ease of a hand fired steam generator.
the moving of the furnace door causes the valve or damper to be opened, and
supply a full or greater amount of air to the chamber; and after this operation,
the said valve or damper becomes shut wholly or more or less by itself, as by its
own weight (or by a positive motion), by a timing device as clockwork, or an
escapement of any suitable kind, or other suitable means.
In the case of the application of this invention to steam generators such as of
the locomotive type, I provide in front of the tube plate a partition or wall, up the
space between this partition and the tube plate, air is admitted-it being controlled
by a suitable valve or damper, while the gases of combustion from the furnace
pass over the top of same and mix with the air, and so prevent the formation of
smoke, and effect proper combustion.
The material of which the chamber or hollow bridge, and the partition or wall,
are made, or parily made, at the parts subjected to great heat, is, by preference, n
suitable fire resisting material.
Referring to the drawings, which illustrate this invention, Figure I is a sectional
elevation, and Figure 2 is a cross section, of a steam generator furnace provided
with the improvements hereunder.
Referring to the drawings, a represents the furnace, being the ashpit, and a the
bridge at the back of the grate. e is a chamber or space within the bridge c, such
space extending from the ashpit to the crown of the bridge. Air is admitted to the
chamber e through an aperture in a front plate, the amount of opening-ar
complete closing or opening-of which is governed by a valve or door which is
regulated and worked by the hand rod g' from the front of the furnace; while hare
apertures in the front wall of the bridge, which admit some of the fire-gases
9,

page_text: rising from the fuel on the grated to the chamber e. Over the apertures the
projecting ledge is provided, by which the introduction of the fire-gases and
Hames from the fuel is assisted.
In the drawing, the apertures are formed by making this portion of the front
wall in the form of a chambered block of suitable fire resisting material. The back
wall and crown are also preferably of similar material.
y
h
The action of the apparatus is, that, assuming the furnace to be in operation with
the door open, air from the ashpit enters the chamber e past that door and
rises upwards therein, whilst fire gases and flame, coming from the fuel on the
grate enter this chamber through the apertures in the front wall, and the air
rising therein mixes with those fire gases, becomes highly heated, and, in this state,
passes to the space above the arch through apertures in the crown i, which forms
the roof of the chamber e. Thus this heated air and the fire-gases, mixing with
the bulk of gases and flames passing over the bridge, effects the ignition and
combustion of any unburnt volatile or other gases which exist in an unconsumed
state in them.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. In a steam generator or other analogous furnace, a chamber or passage in
connection with the grate, into which both air and fire-gases are introduced and
mixed, and from which such air and gases are discharged into the bulk of fire
gases and flames passing over said chamber or passage; substantially as herein set
forth.
2. The furnace having at the back of the grate the bridge c; a chamber e
therein; air inlet below the grate bars, controlled by the valve g; fire gas inlet /
above the grate and fuel; and a perforated crown i; arranged, constructed, and
operating particularly as set forth with reference to and shewn in the drawings.
Dated this 10th day of March 1895
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.