Improvements in and pertaining to Steam Generator and other Furnaces.
Year: 1894

page_text: Date of Application, 26th Feb.,
1894
Complete Specification Left, 24th Nov., 1894-Accepted, 29th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in and pertaining to Steam Generator and other
Furnaces.
I, EDWARD BROOK, of 41 Spring Street, Huddersfield, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to furnaces of the kind having no fire grate and no
ash pit but in which there is in the lower part of the furnace a blast chamber into
which air is induced by a steam jet apparatus the construction being such that the
fuel rests upon the walls of the blast chamber, the cross section of which is such as
to provide at the respective sides longitudinal spaces for the collection of ashes and
clinker below the level of the openings through which air is supplied from the blast
chamber to the fuel. Such a construction of furnace forms the subject of my
previous Patent No. 1140 of the year 1892.
Now the objects of my present invention (which, though designed mainly for
furnaces of internally fired steam generators, is also applicable to heating, puddling,
chemical and other analogous furnaces) are not only the utilization of fuel
(especially that of a comparatively cheap and poor class) to the best advantage but
also the provision of simple means for the easy and efficient working of the furnace.
For this purpose my improved furnace comprises the following features :-(a) a
combustion chamber or space immediately below which is a blast chamber above
and at the sides whereof the fuel rests, this blast chamber having openings in the
upper part of its sides; or, which, as 1 prefer, may be produced by making the
blast chamber with a loose top capable of removal for the purpose of renewals and
which is supported and held in position by projections, so as to leave what may be
practically described as one continuous opening for the distribution amongst the
fuel of air and steam from the blast chamber; (b) a steam jet apparatas placed
externally or projecting within and largely contained within the blast chamber, for
supplying thereto and thence to the fuel air and steam under pressure; (c) a metal
plate or closure provided with fire door at its upper part so that a thick fire may be
maintained, and with, immediately below the fire door, a supplementary door
adapted to give access to and facilitate the removal from the furnace of ashes and
clinker which collect and rest upon and at the sides of the walls or exterior of the
blast chamber-the construction and arrangement being such that the said two
doors close one large opening without any cross bar between them; and (d)
immediately within the furnace front a "dead plate" over which ashes and clinker
can be removed and which is preferably placed at an angle forming an inclined
plane between the bottom of the doorway and a part of the floor or surface on
which fuel rests and ashes and clinker collect below the openings through which air
passes from the blast chamber to the fuel. It will usually be convenient to make
the "dead plate" in two or more parts for convenience of fixing or removal; and
when the blast chamber is constructed as a channel formed with wing plates, the
front plate of the furnace is or may be furnished on its inner face with a projecting
lip to support one edge of the dead plate, the other edge resting upon the wing
plates or channel.
The combined arrangement above described with large or deep doorway, double
doors. and dead plate as set forth. will enable the ashes and clinker which collect

page_text: low down to be easily and rapidly removed and will constitute a great practical
advantage, adding materially to the easy and satisfactory working of the
furnace.
Dated this 26th dow of Fab 1904
Improvements in and pertaining to Steam Generator and other
Furnaces.
I, EDWARD BROOK, of 41 Spring Street, Huddersfield, in the County of York,
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 furnaces of the kind having no fire grate and no
ash pit but in which there is in the lower part of the furnace a blast chamber into
which air is induced by a steam jet apparatus the construction being such that the
fuel rests upon the walls of the blast chamber, the cross section of which is such as
to provide at the respective sides longitudinal spaces for the collection of ashes and
clinker below the level of the openings through which air is supplied from the
blast chamber to the fuel. Such a construction of furnace forms the subject of my
previous Patent No. 1140 of the year 1892.
Now the objects of my present invention (which, though designed mainly for
furnaces of internally fired steam generators, is also applicable to heating, puddling,
chemical and other analogous furnaces) are not only the utilization of fuel
(especially that of a comparatively cheap and poor class) to the best advantage but
also the provision of simple means for the easy and efficient working of the furnace.
For these purposes my improved furnace comprises the following features :-(a) a
combustion chamber or space immediately below which is a blast chamber above
and at the sides whereof the fuel rests, this blast chamber having openings in the
upper part of its sides; or, as I prefer, these openings may be produced by making
the blast chamber with a loose top capable of removal for the purpose of renewals
and which is supported and held in position by projections, so as to leave what may
be practically described as one continuous opening for the distribution amongst the
fuel of air and steam from the blast chamber; (b) a steam jet apparatus placed
externally or projecting within and largely contained within the blast chamber, for
supplying thereto and thence to the fuel air and steam under pressure; (c) a metal
plate or closure provided with fire door at its upper part so that a thick fire may be
maintained, and with, immediately below the fire door, a supplementary door
adapted to give access to and facilitate the removal from the furnace.of ashes and
clinker which collect and rest upon and at the sides of the walls or exterior of the
blast chamber the construction and arrangement being such that the said two
doors close one large opening without any cross bar between them; and (d)
immediately within the furnace front a "dead plate over which ashes and clinker
can be removed and which is preferably placed at an angle forming an inclined
plane between the bottom of the doorway and a part of the floor or surface on
which fuel rests and ashes and clinker collect below the openings through which air
passes from the blast chamber to the fuel. It will usually be convenient to make
the "dead plate" in two or more parts for convenience of fixing or removal; and
when the blast chamber is constructed as a channel formed with wing plates, the
front plate of the furnace is or may be furnished on its inner face with a projecting
"

page_text: The combined arrangement above described with large or deep doorway, double
doors, and dead plate as set forth, will enable the ashes and clinker which collect
low down to be easily and rapidly removed and will constitute a great practical
advantage, adding materially to the easy and satisfactory working of the
furnace.
In the accompanying illustrative drawings,
Fig. 1 is a front elevation ;
Fig. 2 a cross section ;
Fig. 3 a longitudinal vertical section; and
Fig. 4 a horizontal section, showing an internally fired steam boiler constructed
according to this invention.
1 is a combustion chamber and 2 a blast chamber arranged one above the other
and separated by a hearth plate which consists of a tuyere or channel 3 with
wings 3 which rest upon the lower portion of the furnace tube 4 and against the
fire bridge 4 and upon which and the top of the channel the solid fuel to be burnt
rests. The top 3b of the channel 3 is preferably made loose as shown and is
supported by projecting cross pieces 3° of the channel 3 and kept in position by
projections 3d on its underside in such a manner as to leave an opening 3° all round
for the distribution of the blast amongst the fuel. By thus making the top 3b loose
it can be easily removed for the purposes of renewal, or for obtaining access to the
blast chamber 2.
5 is a steam jet apparatus for supplying air and steam to the blast chamber 2 and
thence through the opening 3° in the channel 3 to the fuel. This apparatus, which
is similar in construction to that described and shown in my said prior Specification,
may be arranged to project into and be largely contained within the blast chamber 2
as shown, or it may be fixed externally to the blast chamber.
6 is the metal plate or closure which forms the front plate of the furnace; it is
provided with a hinged fire door 7 at its upper part and with a supplementary
hinged door 7 immediately below, the upper door serving when opened for charging
coal and breaking up the fire, and the lower one for cleaning out ashes and clinker.
The two doors close one large opening that is without any cross bar and through
which large pieces of clinker can be easily removed from the combustion chamber 1.
8 is a "dead plate" arranged in an inclined position with one edge resting on
a lip 6 projecting from the front plate 6 and with its opposite edge resting on a
lip 3 of the channel 3.
It will be seen that the construction of furnace described enables a thick fire to
be maintained without having the doors 7 and 7 abnormally large or deep, and at
the same time gives room for attaching the steam jet apparatus 5 to the front of the
furnace. The dead plate 8 though shown as a single plate, may be made in two or
more pieces for convenience of lifting in and out.
The application of this invention to a reverberatory furnace as used for
puddling or heating iron, is illustrated by Figs. 5, 6, & 7 of the accompanying
drawings,
Fig. 5 being a longitudinal vertical section,
Fig. 6 a half cross section, and a half end elevation; and
Fig. 7 a horizontal section of so much of such a furnace as is necessary to
illustrate such application.
The same reference figures are used as in the foregoing description to indicate
similar parts, 1 being the combustion chamber for containing the fuel; 2 the blast
chamber below the same; 3 the tuyere or channel with wings 3* supported by steps
or recesses in the walls of the blast chamber; 3b the loose top or cover for
the same; 5 is the steam jet apparatus for supplying air to the fire; 7 and 7* the
main and supplementary fire doors hinged one above the other to the front plate 6
of the furnace; and 8 the dead plate which in this case is preferably formed
in brickwork as shown but is made to slope upwards from the level of the hearth

page_text: plate 3, 3* to the bottom of the doorway, for the purpose of reducing the size of the
doors. 10 is an opening for gaining access to the blast chamber 2 whenever
required; the said opening at other times being closed by a door or by a wall 10
as shown in Fig. 5.
In the case of reverberatory furnaces, the upper door 7 may be arranged to lift
or slide vertically instead of being hinged to swing horizontally as shown in Figs. 6
and 7.
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. A steam generator or other furnace having a combustion chamber separated
from a blast chamber below by a wall or division the cross section of which is such.
as to provide at the respective sides longitudinal spaces for the collection of ashes
and clinker below the level of the openings through which air is supplied from the
blast chamber to the fuel, and a furnace front provided with a fire door 7 at its
upper part so that a thick fire can be maintained, and with immediately below the
said fire door, a supplementary door 7" adapted to give access to and facilitate the
removal from the furnace of ashes and clinker which collect and rest upon
the bottoms of the said longitudinal spaces, the construction and arrangement being
such that the said two doors close one large opening without any cross bar between
them substantially as hereinbefore described with reference to the drawings.
2. A steam generator or other furnace comprising combustion and blast chambers
separated by a hearth plate 3 3 upon which the fuel rests and having lateral
outlets for air and steam, the front end of the combustion chamber being provided
with a dead plate and with main and supplementary doors 7, 7ª arranged one
directly above the other so as to close one large opening with no cross bar between
them, and the blast chamber being provided with a steam jet apparatus 5 placed
either external to or projecting into it, all substantially as described and shown for
the purposes specified.
3. The improved furnace constructed and arranged as hereinbefore described
with reference to and shown in Figs. 1 to 4 inclusive of the drawings annexed.
4. The improved furnace constructed and arranged as hereinbefore described
with reference to and shown in Figs. 5 to 7 inclusive of the drawings annexed.
Dated this 24th day of November 1894.
W. Lloyd Wise,
EDWARD BROOK.
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.