Improvements in or connected with Steam Generator and other Furnaces.
Year: 1892

page_text: Date of Application, 24th Sept., 1892
Complete Specification Left, 24th June, 1893-Accepted, 5th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Steam Generator and other
Furnaces.
We, WALTER HEBDEN WILSON, of Nortonsea, Waterloo, in the County of
Lancaster Shipowner, and HARRY TEE, of 10, Blucher Street, Waterloo, aforesaid,
Engineer, do hereby declare the nature of our invention to be as follows:-
:―
This invention relates to steam generator and other furnaces or fire-grates, but
more particularly to steam generator furnaces, and the invention is herein described
in relation to such furnaces.
According to this invention the furnace space is provided with a series of hollow
fire-bars, each bar having ducts which are for the primary or undergrate air supply
to the furnace. The bars may be of cast iron or other metal, the upper surface of
the bar being provided with a covering or surface of ganister or fire clay. The
bars extend from the furnace front to the bridge of the furnace. The air supply
entering the bars at the front of the furnace through one duct in the bars and
passing through the length of the bars and returning to the front of the furnace
through a second duct which is closed at the front of the furnace but opens into
the ashpit.
Two or more of these firebars may be used, but only in the centre of the furnace.
The sides of the furnace are composed of inclined slabs preferably of refractory
material such as fire-clay or ganister. These inclined sides extend from the front
of the furnace to the bridge.
The bridge or back of the furnace is carried down from the crown of said furnace
to the bottom of the ashpit, an aperture being provided below the crown of the
furnace and over the bridge proper for the passage of the products of combustion.
The side slabs of the furnace are provided with a duct or a series of ducts one
or more of which are open at the front of the furnace, their other end or ends
opening out into the space or aperture above the bridge. These ducts may be
straight through ducts or return ducts, and are employed to provide the secondary
supply of air above the bridge to the products of combustion in the furnace.
The front of the furnace and ashpit, with the exception of the ducts for the
primary air supply through the fire-bars, and the ducts for the secondary air
supply through the side parts, is entirely closed. The usual fire doors and ashpit
doors being provided.
Underneath the fire-bars there is provided one or more steam-jet pipes to supply
a portion of steam to mix with the primary air supply.
To prevent clinkers forming one or more of the fire-bars is or are so fitted that
a vertical, horizontal, or rocking movement can be imparted thereto by a lever or
other suitable known means.
In operation, fuel being supplied to the furnace, & the fuel being in a state of
combustion, the primary air supply for supporting such combustion at first passes
through the ducts in the hollow fire-bars, becoming heated in its passage, then
mingling with the steam from the steam jets in the ashpit, it passes up through the
spaces between the fire-bars to support the combustion in the furnace; a secondary
supply of air at the same time passing thro. the ducts in the sides of the furnace
and also becoming heated in its passage meets the products of combustion at the
aperture above the bridge of the furnace.
We would have it understood that in the carrying out of this invention in its
application to various kinds of furnaces, the parts and their arrangement will of

page_text: course require a certain amount of modification to meet the different circumstances
of its application.
Dated this 22nd day of September 1892.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicants' Patent Agents.
Improvements in or connected with Steam Generator and other
Furnaces.
We, WALTER HEBDEN WILSON, of Nortonsea, Waterloo, in the County of
Lancaster, Ship Owner, and HARRY TEE, of 10, Blucher Street, Waterloo, afore-
said, Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to steam generator and other furnaces or fire-grates, but
more particularly to steam generator furnaces, and the invention is herein described
in relation to such furnaces.
According to this invention the furnace space is provided with a series of hollow
fire-bars, each bar having ducts which are for the primary or undergrate air supply
to the furnace. The bars may be of cast iron or other metal, the upper surface of
the bar being provided with a covering or surface of ganister or fire-clay. The
bars extend from the furnace front to the bridge of the furnace. The air supply
entering the bars at the front of the furnace through one duct in the bars and
passing through the length of the bars and returning to the front of the furnace
through a second duct which is closed at the front of the furnace but opens into
the ashpit.
Two or more of these fire-bars may be used, but only in the centre of the furnace.
The sides of the furnace are composed of inclined slabs preferably of refractory
material such as fire-clay or ganister. These inclined sides extend from the front
of the furnace to the bridge.
The bridge or back of the furnace is carried down from the crown of said furnace
to the bottom of the ashpit, an aperture being provided below the crown of the
furnace and over the bridge proper for the passage of the products of combustion.
The side slabs of the furnace are provided with a duct or a series of ducts one
or more of which are open at the front of the furnace, their other end or ends
opening out into the space or aperture above the bridge. These ducts may be
straight through ducts or return ducts, and are employed to provide the secondary
supply of air above the bridge to the products of combustion in the furnace.
The front of the furnace and ashpit, with the exception of the ducts for the
primary air supply through the fire-bars, and the ducts for the secondary air
supply through the side parts, is entirely closed, the usual fire-doors and ashpit
doors being provided.
Underneath the fire-bars there is provided one or more steam-jet pipes to supply
a portion of steam to mix with the primary air supply.
To prevent clinkers forming, one or more of the fire-bars is or are so fitted that
a vertical, horizontal, or rocking movement can be imparted thereto by a lever or
other suitable known means.
In operation, fuel being supplied to the furnace, and the fuel being in a state of
combustion, the primary air supply for supporting such combustion at first passes
through the ducts in the hollow fire-bars, becoming heated in its passage, then
mingling with the steam from the steam jets in the ashpit, it passes up through the
space between the fire-bars to support the combustion in the furnace; a secondary
supply of air at the same time passing through the ducts in the sides of the furnace

page_text: In action, the primary air enters at the front plate into the upper passages e of
the bars a, and passes to the back end of same, then down and back to the front
ends, and out, by the apertures e', into the ashpit t. Here it mixes with steam
introduced through the pipes r, and together with such steam passes up through the
spaces between the middle and the side bars a into, and through the fuel. The
fuel is mainly burned by this air, but those gases which are unconsumed by it are
burned by the hot secondary air supplied from the apertures o', which air being
hot and issuing at right angles to the direction of flow of the furnace gases causes
a thorough mixture to take place and effects complete combustion. This air
receives its heat from the brickwork or ganister in which the pipes o are laid.
To clean the fire of ash or ash and clinker, the centre bar a is moved, that is
partially drawn out by the lever and then pushed back again. By this means
cleanliness of the fire may be obtained, and the rate of combustion regulated
by the freedom afforded for the passage of air through the air spaces between
the bars.
In some cases we may both in connection with the primary air and secondary
air employ means of introducing such air under pressure or by artificial means,
either by means of a blast or other suitable mode of forcing the air, or by artificial
exhausting apparatus.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A steam generator or other furnace comprising a longitudinally movable or
sliding bottom, or fire-bearer or fire bearers; and inclined sides of or faced with
fire-brick or fire resisting material; substantially as herein set forth.
2. In or for a steain generator or other furnace, a fire-bearer or bearers with
conduits therein, through which air used in the combustion of the fuel is passed,
and having upon their upper face fire-brick or equivalent fire-resisting material
substantially as set forth.
3. A steam generator or other furnace comprising a fire-bearer or bearers, such
as described; inclined sides of fire-brick or fire-resisting material, such as
described; a closed ashpit; and an aperture or apertures in the front for the
introduction of air into and through said fire-bars or bearers and which is delivered
into said closed ashpit: substantially as set forth.
4. A steam generator or other furnace having a fire-bearer longitudinally
arranged and supported at each end, and adapted to be reciprocated longitudinally,
and inclined sides; substantially as and for the purposes herein set forth.
5. The arrangement in a steam generator or other furnace, of fire-bearers;
fire-brick sides; and primary and secondary inlet conduits and arrangements by
which such airs are heated prior to use and application; all as herein set forth.
Dated this 23rd day of June 1902
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicants' Patent Agents.

page_text: nd also becoming heated in its passage meets the products of combustion a
aperture above the bridge of the furnace.
We would have it understood that in the carrying out of this invention in its
application to various kinds of furnaces, the parts and their arrangements will of
course require a certain amount of modification to meet the different circumstances
of its application.
In the drawings which serve to illustrate our invention.
Figure 1 is a cross section, and Figure 2 is a longitudinal section of an
example of furnace, applied to an internally fired steam generator, according to
our invention.
Figures 3 and 4 are respectively outside end view and plan, illustrating the
external fittings and construction of furnace.
Figures 5 and 6 are respectively cross section and longitudinal section illustrating
a fuel bar or bearer according to the invention.
With reference to the drawings, a designates, generally, a fire bearer according
to this invention; bare the sides of the furnace which are made of or consist of
biccks or bricks of fire resisting material such as fire-clay or ganister, and as will
be seen are inclined. c is the bridge at the back end of the furnace, with an
designates generally
aperture at d, through which the gases of combustion pass.
the steam generator, which, as will be seen, is of the "Cornish" type.
As regards the construction of the fire-bearers a. they consist of cast iron bars
with conduits e running through them from front to back, and from back to front,
the passage running from front to back being disposed above the other; this
These bars rest at the back end upon
however might be reversed in some cases.
the iron step c¹ of the bridge c, and at the front end by the front plate f of the
furnace, or a special bar f' as shewn in Figure 2.
In the example shewn, the centre bar only of the three is movable, the outside
two being fixed and covered above, and at their outer sides, with the ganister or
brick forming the sides of the furnace. The upper side or surface of the centre
movable bar is provided with fire-brick blocks or ganister h, which fits at its lower
part or edge in the upper edge of the fire bar by a dovetail or equivalent groove
thereon, which is formed by the projecting ledges i on the bar, and groove being
covered, and the fire-brick material held in at the front and back end, by the
overhanging portions k. This bar is moved longitudinally by the lever l, which is
mounted or pivoted at to the furnace front f, and has one end engaged with the
bar by the eye m, fixed in the end thereof.
As regards the sides of the furnace, as above stated, they are formed of fire-
brick blocks or ganister, in which holes or apertures are provided, and in which
pipes o are laid, through which air is caused to pass. This air is finally delivered
in a heated condition through the conduits o' in the bridge c, the air being
introduced through the furnace front plate fat o' (see Figure 3). In some cases
the air may be further heated by extending the pipes o, naked, past the bridge into
a flue of the furnace as shewn ; these however could also be covered with ganister
if desired, or when used.
At the front part of the furnace in the example shewn in the drawings, we
provide a dead plate p to protect the front part of the centre bar a.
To keep the bars cool and to prevent the formation or creation of clinkers of
large size, we provide steam in the ashpit and this is introduced by a steam
pipe which is led into the ashpit t under each side thereof and is distributed
therein.
The ashpit is enclosed by the front plate f, but access is had to it by the
door t¹.
The sides of the ashpit are lined with cast iron or other metal plates s.
The furnace front is provided with an opening, opposite the open end of the
5 passage e of each of the side fire-bars a, through which apertures, together with
that which enters by the aperture in the front of the centre fire-bar a, all the
primary air enters.