Improvements in Steam Generator and other Furnaces.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Steam Generator and other Furnaces.
I, EDWARD BROOK, of 7, Water Street, Huddersfield, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
1
This invention relates to the furnaces of steam generators and other analogous
furnaces of the kind having a closed ashpit or chamber below the fuel bearers, to
which air is supplied under pressure by means of steam jet apparatus, or other
suitable means, and wherein the fuel bearers consist of metal plates having a
raised part or tuyere with openings in its sides for delivering air to the fuel some
distance above the surrounding plates, thus forming channels or cavities in which
the dross and ashes may collect at a lower level than the openings through which
air is supplied from the blast chamber to the fuel.
A construction of furnace of this kind is described in the Specification of
former Letters Patent granted to me No. 4088 of 1894.
According to my present invention small grates or perforations of any con-
venient or suitable shape are provided on, or in, parts of the plates which sur-
round the raised channel or tuyere in order to allow a portion of the air or blast
to pass through the fuel bearers at such parts for the purpose of supplying air to
those portions of the fire which are away from the said channel or tuyere and
are consequently liable to lie more or less dormant or inactive and also to facili-
tate thereby the lighting of the fires and the raising of steam by aid of the
chimney draught before the steam jet is available.
The small grates, perforations, or openings are, or may be advantageously dis-
posed or placed at those parts of the hearth plates that are furthest away from
the channel or tuyere more especially towards the front parts of the fuel bearers,
that is to say--in those parts nearest to the fire door, and also what is usually
the dead plate. To provide for the removal of the ashes which fall through the
said perforations, and to admit air freely to the ash pit or blast chamber when
working with chimney draught, the plate which closes the front of the blast
chamber is provided with an opening normally closed by a lid or cover, and to the
said plate the steam jet blower, or blowers may also be attached.
Dated thin 1nt do Tun 1000

page_text: Improvements in Steam Generator and wer
I, EDWARD BROOK, of 7, Water 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 relates to the furnaces of steam generators and other analogous
furnaces of the kind having a closed ashpit or chamber below the fuel bearers to
which air is supplied under pressure by means of steam jet apparatus or other
suitable means, and wherein the fuel bearers consist of metal plates having a
raised part or tuyere with openings in its sides for delivering air to the fuel some
distance above the surrounding plates, thus forming channels or cavities in which
the dross and ashes may collect at a lower level than the openings through which
air is supplied from the blast chamber to the fuel.
A construction of furnace of this kind is described in the Specification of
former Letters Patent granted to me No. 4088 of 1894.
According to my present invention small grates or perforations of any con-
venient or suitable shape are provided on, or in, parts of the plates which sur-
round the raised channel or tuyere in order to allow a portion of the air or blast
to pass through the fuel bearers at such parts for the purpose of supplying air to
those portions of the fire which are away from the said channel or tuyere and
are consequently liable to lie more or less dormant or inactive, and also to facili-
tate thereby the lighting of the fires and the raising of steam by aid of the
chimney draught before the steam jet is available. The small grates, perfora-
tions, or openings are, or may be advantageously disposed or placed at those parts
of the hearth plates that are furthest away from the channel or tuyere, more
especially towards the front parts of the fuel bearers, that is to say-in those parts
nearest to the fire door, and also what is usually the dead plate.
In the accompanying drawings Fig. 1 is a vertical section on the line A A of
Fig. 2; Fig. 2 a horizontal section on the line B B of Fig. 1; and Fig. 3 a cross
section on the line C C of Fig. 1 showing a steam generator furnace embodying
the present invention.
1 is the ashpit or blast chamber closed at the front end by a plate or casting 2
and to which air is supplied at a pressure greater than that of the external atmos-
phere by steam jet apparatus 1ª or other means; 3 are the fuel bearers formed of
metal plates surrounding the raised part or tuvere 4 which has openings 4" in
its sides for delivering air to the fuel at points some distance above the sur-
rounding plates or fuel bearers, such opening being formed, in the example
shown, by spaces that are left between the top of the sides of the tuvere 4 and the
bottom of the movable top or cover 4 of such tuvere; and 5 are the channels or
cavities in which dross and ashes collect below the level of the said openings 4",
all as described in my said former specification.
6 are perforations formed in the fuel bearers 3 according to the present inven-
tion for the purpose of admitting air from the blast chamber 1 to the fuel at those
parts thereof which are liable to remain more or less dormant, or inactive, owing
to their distance from the tuyere openings 4. Such perforations also facilitate
the ignition of the fuel at starting, and the rapid and equable re-ignition of the
same after cleaning out the dross and ashes, by reason of part of the air ascending
from the bottom or lowest point of the fuel. The perforations are shown arranged
along the outer portions of the side plates 3 and in the dead plate and may be
of various shapes, as seen in plan, such as circular, as shown, or oval, or in the

page_text: form of slots; or separate grates or grate-bars may be used if desired, the perfora-
tions or openings in each case being preferably of conical or flaring form to pre-
vent their being readily choked by ashes. The top or cover 4b of the tuyere 4
may obviously be also formed, if desired, with similar perforations 6" along its
central part for the purposes hereinbefore set forth. The fuel bearers or metal
plates 3 may be constructed of any convenient size or section, and be, together
with the tuyere 4, supported in any convenient manner. In the example shown,
the side and front plates are carried partly by the side and front plates of the
combustion chamber and partly by longitudinal bars or bearers 7, 7" that are
connected at their front ends to the plate and at their rear ends are carried by
lugs on the rear plate which is made of sufficient width to be carried by the
wall of the combustion chamber.
To provide for the removal of ashes which fall through the various perforations
or openings 6, and for the purpose of admitting air freely to the ashpit or blast
chamber I when working with chimney draught, the plate 2 which closes the
front of the ashpit or blast chamber and may, if desired, carry the steam jet blow-
ing apparatus, is formed with an opening 2" normally closed by a lid or cover 8.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what I
claim is:-
In a steam generator or other furnace having a closed ash pit or blast chamber
to which air is supplied under pressure and the fuel bearers consist of metal
plates having a raised part or tuyère with lateral openings in its sides for deliver-
ing air to the fuel at some distance above the surrounding plates as set forth,
providing parts of the plates surrounding the raised channel or tuyere with small
grates or perforations so that air can be supplied to those portions of the fire which
are away from the said channel or tuyere and which are consequently liable to be
more or less inactive, whereby a more uniform combustion of the fuel can be
ensured, and the lighting of the fire and generation of steam by aid of the
chimney draught before the steam jet apparatus is available, can be facilitated
substantially as hereinbefore described with reference to the drawings.
1
1000
Jattu CITIS
Brd day
01
February 1999.
For the Appplicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.