An Improved Apparatus for Consuming Smoke and Saving Fuel in Furnaces.
Year: 1890

page_text: Date of Application, 24th May, 1890
Complete Specification Left, 21st Feb., 1891-Accepted, 28th Mar., 1891
PROVISIONAL SPECIFICATION.
An Improved Apparatus for Consuming Smoke and Saving Fuel in
Furnaces.
We, GEORGE MOFFATT, of 152 Gresham House, Old Broad Street, and
SAMUEL STUTTAFORD, of 49, Fore Street, both in the City of London, Merchants,
do hereby declare the nature of this invention to be as follows:-
The object of our invention is to provide an apparatus for consuming smoke and
saving fuel in furnaces by admitting air thereto in rear of or behind the furnace
whereby a more perfect combustion of the fuel and of the gases proceeding
therefrom will be ensured which will not only economize the fuel either in quantity
or in quality or in both but will effect the consumption of the smoke and this our
apparatus will be applicable for and with nearly all furnaces and especially those
in Cornish and Lancashire and similar or other boilers wheresoever the furnace is
contained in an horizontal chamber.
To carry out this object we construct and build the bridge that is usually in this
class of furnace situated at the rear end of the same or that is to say in the
position where the furnace proper that is the fire bars and the fuel thereon
terminate in the following manner.
This our bridge consists of a preferably metal block or casting which is fitted in
the horizontal furnace chamber in the proper position horizontally therein and
transverse thereto and this block can be so arranged and formed as to support the
rear or inner ends of the fire bars and the upper surface of this block is made of
a semicircular or other form transversely corresponding with the transverse shape
of the upper part of the horizontal furnace chamber in such wise as to leave an
equal or a nearly equal space or distance between such upper part of the chamber
and the upper surface of the block all round the same from the base of the block
on the one side to the base of the block on the other side which base extends right
across the furnace chamber. Through this block we can form two or three or
more narrow transverse passages which preferably open at their lower ends close
or rather close together it may be in a chamber or recess made in the block on its
lower surface therefor and the upper ends of these passages may similarly be close
or rather close together or they may be spread out that is to say longitudinally in
the furnace chamber as may be desired or be similarly contracted or in other
words these passages may be parallel with each other or may be inclined from or
towards each other as may be desired but in all cases these passages are open all
In this
round the upper semicircular or other surface of the block or nearly so.
block also between the passages therethrough we can form a number of chambers
which may communicate with each other through a chamber common to all in the
base of the block on each side which two chambers in the base on the two sides or
ends thereof may communicate with the boiler whereby the water in the boiler can
circulate through this block to its manifest advantage in the way of heating. In
front of this block we can fit a face or build up a wall or shield of fire clay or
fire brick or other similar and suitable material to prevent the block being burnt
or damaged by the heat of the furnace and this face closely adjoins the block
and has a corresponding and similar upper surface or shape to that of the block
as aforesaid but in all cases and all round the same it is made a little higher than
the block or projects a little from and beyond the same to prevent as far as may
be the direct impact of the flames from the furnace on the block and in the front
web of the block or that is to say in that part thereof that is between the front or
first transverse passage and the face we can conveniently make a number of holes
to allow the heat of the face readily to enter the passage.

page_text: This block so constructed and fitted constitutes the bridge of the furnace and
below the transverse passages therein or the chamber or recess whereinto the same
open we can fit an hinged plate or damper which can be actuated by a suitable
rod and lever or otherwise to govern the admission thereto of such air as passes
into the furnace chamber below the fire bars and this plate or damper also guides
and leads this air to these transverse passages and on passing thereout the air is
directed across the path of the unconsumed gases and smoke proceeding from the
furnace and thereby is effected the desired more perfect combustion.
The lower part of the horizontal furnace chamber below and behind the bridge
can be closed as is usual in any convenient manner.
Dated thi
1000
COMPLETE SPECIFICATION.
An Improved Apparatus for Consuming Smoke and Saving Fuel in
Furnaces.
We, GEORGE MOFFATT, of 152, Gresham House, Old Broad Street, and
SAMUEL STUTTAFORD, of 49, Fore Street, both in the City of London,
Merchants, 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 :-
The object of this our invention is to provide an apparatus for consuming smoke
and saving fuel in furnaces by admitting air to the chamber in rear of or behind
the furnace whereby a more perfect combustion of the fuel and of the gases
proceeding therefrom will be ensured which will not only economize the fuel either
in quantity or in quality or in both quantity and quality but will effect the con-
sumption of the smoke and this our improved apparatus will be applicable for and
in and with nearly all furnaces and especially those in Cornish and Lancashire and
similar or other boilers wheresoever the furnace is contained in an horizontal
chamber.
In order the more clearly to explain this our invention and in what manner the
same is to be performed we refer to the accompanying drawing wherein we have
shewn the bridge that is usually in this class of furnace situated at the rear end of
the same or that is to say in the position where the furnace proper that is the fire
bars and the fuel thereon terminates constructed and built in such wise as to con-
stitute this our improved apparatus and Figure 1 is the longitudinal section of part
of an horizontal flue or furnace chamber shewing a vertical section of our apparatus
and Figure 2 is the transverse section of the horizontal flue or furnace chamber
taken at a bin Figure 1 and shewing a front elevation of our apparatus.
This our bridge consists of a preferably metal block or casting A which can
be fitted and fixed in the horizontal furnace chamber in the proper position
horizontally therein and transversely thereto and this block A can be so arranged
and formed as is shewn in the drawing as to support the rear or inner ends of the
fire-bars B and the upper surface of the block A is made transversely of a semi-
circular or other form corresponding with the transverse shape of the upper part
of the horizontal furnace chamber in such wise as to leave an equal or a nearly equal
space or distance between such upper part of the chamber and the upper surface
of the block A all round the same from the base of the block A on the one side to
the base of the block A on the other side which base extends right across the
furnace chamber as is shewn in Figure 2. Through this block A we can make
and form two or three or more narrow transverse passages C the lower ends
whereof are preferably close or rather close together and may open into a chamber
or recess made therefor in the lower surface of the block A and these passages
may be parallel with each other or may be inclined towards each other or as is
perhaps preferable and as is shewn in Figure 1 may be inclined from each other
C

page_text: and be spread out longitudinally in the furnace chamber but in all cases these
passages C are open all round the upper semicircular or other surface of the
block A or nearly so.
In this block A also between the passages C therethrough
we can make and form a number of chambers D which may communicate with
each other through a chamber E common to all in the base of the block A on
each side which two chambers E in the base on the two sides or ends thereof may
communicate with the boiler whereby the water in the boiler can circulate through
this bridge to its manifest advantage in the way of heating. Immediately in front
of this block A we can fit a face or build up a wall or shield of fire clay or fire
brick or other similar and suitable material F to prevent the block A being burnt
or damaged by the heat of the furnace and the upper edge of this face F is of a
shape similar to and corresponding with that of the upper surface of the block A
as hereinbefore described but is a little higher or larger or projects a little from
and beyond the same all round to prevent as far as may be the direct impact of the
flames from the furnace on the block and in the front web of the block A or that
is to say in that part thereof that is between the front or first transverse passage C
and the face F we can conveniently make a number of holes H to allow the heat
of this face F readily to enter this passage C.
This block so constructed and built and fitted constitutes the bridge of the
furnace and below the transverse passages C therein or the chamber or recess
wherein to the same open we can fit a rearwardly hinged plate K which can be
actuated from the front of the furnace or elsewhere by a suitable rod and
lever L.
The lower part of the horizontal furnace chamber below and behind the
bridge can be closed by the plate M or otherwise in any usual or convenient
manner.
When therefore after the furnace is lighted the plate K is opened it guides and
leads the air that enters the horizontal furnace chamber below the fire bars B to the
passages C and can also obviously govern the amount of such air as it is desired
to admit to these passages C and when this air passes out of the passages C it is
directed across the path of the unconsumed gases and smoke proceeding from the
furnace and thereby is effected the desired more perfect combustion.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. The arrangement and combination of parts and appliances constituting our
improved apparatus for consuming smoke and saving fuel in furnaces substantially
as hereinbefore described.
2. In an apparatus for consuming smoke and saving fuel consisting of a bridge
in the rear of the furnace the combination in and with a block A of transverse
passages C chambers D and a face F with holes H substantially as and for the
purpose hereinbefore described and declared.
Dated this 16th day of February 1891.