IMPROVEMENTS APPLICABLE TO STEAM-BOILER AND OTHER FURNACES
Year: 1885

page_text: We, HUGH CHRISTIE PATERSON of 12 Waterloo Street, and ROBERT MILLER of
12 Adelphi Street, Bridgeton, Glasgow, in the County of Lanark, North Britain,
respectively, Merchant Engineer and Practical Engineer do hereby declare the
nature of the said invention for IMPROVEMENTS APPLICABLE TO STEAM-BOILER AND
OTHER FURNACES to be as follows:-
This Invention, which relates to improvements applicable to steam-boiler and
other furnaces, has for its object the more thorough combustion of the fuel used in
such furnaces.
In carrying this Invention into practice, a second bridge preferably constructed
of fire brick and higher, is arranged at the back of the bridge proper or furnace
bridge. Between these two bridges an arch or inverted bridge is or may be placed
of a depth sufficient to check the passage of the products of combustion from
escaping unburnt into the flue. Through the furnace bridge and below the fire-
grate there is formed an opening provided with a damper which may be constructed
to open in conjunction with the furnace door or otherwise and the closing of which
damper is preferably governed by a regulator. A pipe or pipes may be led from
this opening through the bridge to the furnace front either partly above or below
the fire-grate and at the outer end or ends thereof doors or dampers are arranged
which doors also may be opened and closed automatically.
The opening through the bridge may be connected to a pipe the end of which
may curve upwards.
The arrangement of apparatus hereinbefore described causes the products of
combustion to be drawn downwards behind the furnace-bridge where, by their
meeting and mixing with the highly heated air passing through the openings in
the bridge, they become more completely burned and pipes are or may be provided
for supplying steam or steam and air either under or above the fire-grate.
D: touth day of Santambor 1885

page_text: ларготетени пррпсарлею робаш ронега бег гигласов.
We, HUGH CHRISTIE PATERSON of 12 Waterloo Street, and ROBERT MILLER of
12 Adelphi Street, Bridgeton, Glasgow, in the County of Lanark, North Britain,
respectively. Merchant Engineer and Practical Engineer do hereby declare the
nature of our invention for IMPROVEMENTS APPLICABLE TO STEAM-BOILER AND
OTHER FURNACES and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
Our Invention, which relates to improvements applicable to steam-boiler and
other furnaces, has for its object the more thorough combustion of the fuel used in
such furnaces.
In carrying our Invention into practice, a second bridge preferably constructed
of tire-brick and higher, is arranged at the back of the bridge proper or furnace
bridge. Between these two bridges, an arch or inverted bridge is or may be placed
of a depth sufficient to check the passage of the products of combustion from
escaping unburnt into the flue. Through the furnace bridge and below the fire-
grate there is formed an opening provided with a damper which may be constructed
to open in conjunction with the furnace door or otherwise and the closing of which
damper is preferably governed by a regulator. A pipe or pipes may be led from
this opening through the bridge to the furnace front either partly above or below
the fire-grate, and at the outer end or ends thereof doors or dampers are arranged,
which doors also may be opened and closed automatically.
The opening through the bridge may be connected to a pipe, the end of which
may curve upwards.
The arrangement of apparatus herein before described causes the products of
combustion to be drawn downwards behind the furnace-bridge where, by their
meeting and mixing with the highly heated air passing through the openings in
the bridge, they become more completely burned, and pipes or their equivalents are
or may be provided for supplying steam or steam and air either under or above
the fire grate.
In order that our Invention may be properly understood and readily carried into
effect, we will now proceed to describe the drawings hereunto annexed.
Figure 1, is a longitudinal section of part of a steam boiler, the furnace of which
is constructed according to our present Invention.
Figure 2, is a front elevation of the same.
Figure 3, is a transverse section of the same taken on the line A. B. Figure 1.
Figures 4 and 5 are longitudinal sections of parts of steam boilers the furnaces
of which are constructed according to modifications of our present Invention.
In carrying our Invention into practice the bridge a, is erected at the back of
the furnace bridge b, of a height dependent upon the capacity of the flue c, and
the draught through such flue. Between the bridges a, and b, there is provided
the inverted bridge or arch d, of such depth as will check the passage of the
products of combustion from escaping direct to the chimney. Through the furnace
bridge b, the opening e, is formed, the said opening being provided with a damper
or its equivalent which may, if desired, by any of the well-known means, be
arranged to open in conjunction with the furnace door f, and close under control
of a regulator. At Figures 1 and 2 of the annexed drawings, the opening e, is
represented as closed by the vertical back plate i, of the tray g, by pulling forward
which, air is admitted through the said opening e, to the back of the bridge b.
By the arrangement represented at Figure 4, of the annexed drawings air is
admitted to the back of the bridge b, by means of the damper or valve h, which

page_text: is pivoted upon the vertical back plate i, of the tray g, and which may be opened
by pulling the chain j, represented in dotted lines at Figure 4. This chain may
be connected to the furnace door f, so as to open the damper or valve h, simul-
taneously therewith. By the arrangement represented at Figure 5, air is admitted
to the back of the bridge b, through the opening or openings k, formed in the side
of the sliding valve or damper l, when such valve or damper is drawn forward
and the openings k, therefore uncovered.
In place of admitting air to the back of the bridge in the manner herein before
described, a pipe such as that shewn at m, Figure 1, may be arranged to pass
through the said bridge and curve upwards at its rearward end as shewn at Figure 1.
This pipe m, may be supported wholly beneath the furnace grate n, and extend
outwards to the furnace front, or the said pipe as shewn at Figure 1, may pass
upwards at the side and to the top of the furnace grate n, and at its front either
pass directly out through the furnace front or turn down through and to the
underside of the said grate n. The pipe m, at its front end is provided with
a valve or cover which may be operated by hand or so arranged as to operate in
conjunction with the furnace door f. The arrangement shewn at Figures 1 and 2,
by means of which air is admitted through the pipe m, consists of the plate o,
which is rigidly carried on the bracket p, secured to the underside of the furnace
door f, and so arranged that when the said furnace door is opened the plate is
moved from under the mouth of the pipe m, and air is consequently drawn there-
through and highly heated during its passage to the back of the furnace bridge b.
Provision for still further assisting combustion may be had by supplying steam
at the under or upper side of the grate n, or at the back of the bridge b. At
Figures 1, 2 and 3, of the annexed drawings the means for supplying steam at the
underside of the grate n, consist of the tray g, in which some water is constantly
kept, and the steam generated from which ascends through the said grate n, and
into the furnace supported thereon. By the arrangement represented at Figure 5,
of the annexed drawings steam is conducted by the pipe q, from the upper part of
the steam boiler 8, to the rear side of the bridge b, or the said pipe may be
arranged to discharge steam through perforations or jets at the under or upper side
of the grate n, or any combination of such arrangements may be applied to one
and the same boiler, suitable valves as shewn at r, Figure 5, being provided to
enable steam to be discharged at all or any of the desired points.
Having now particularly described and ascertained 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 improvements in steam boiler and other furnaces consisting of the
second bridge a, and the inverted bridge or arch d, between it and the furnace
bridge b, all substantially as and for the purposes hereinbefore set forth with
reference to the annexed drawings.
Second. The means for supplying heated air to the back of the furnace bridge b,
and the combination thereof with the apparatus claimed in the preceding claiming
clause all substantially as and for the purposes hereinbefore set forth with reference
to the annexed drawings.
Third. In combination with the apparatus claimed in the first preceding claiming
clause, the means for supplying steam to the furnaces and to the back of the
furnace bridge b, all substantially as and for the purposes hereinbefore set forth
with reference to the annexed drawings.