IMPROVEMENTS IN APPARATUS FOR CONSUMING SMOKE
Year: 1883

page_text: LETTERS PATENT to Charles Mace and John Brewster, of Sunderland, in the
County of Durham Engineers for an Invention of IMPROVEMENTS IN
APPARATUS FOR CONSUMING SMOKE
PROVISIONAL SPECIFICATION left by the said Charles Mace and John
Brewster at the Office of the Commissioners of Patents on the 13th June
1883.
CHARLES MACE and JOHN BREWSTER of Sunderland in the County of Durham,
Engineers, " IMPROVEMENTS IN APPARATUS FOR CONSUMING SMOKE
"
Our invention relates to certain appliances by which an adequate supply of
atmospheric air, variable in quantity and in point of application, can be admitted
to the Furnace by simple mechanism, in such a manner as to effect complete
combustion of the fuel, thus preventing smoke, while the efficiency of the
furnace is increased. The apparatus as a whole consists of the following parts
vis;
The first portion of the apparatus is the "dead plate," formed with an air box or
boxes, fitted with doors by which the admission of air can be regulated. The front
of the "Dead plate" has openings through which the air, after passing through the
box or boxes and being heated is thrown into the Fornace, and open slots are also
provided in the ledge on which the fire bars rest, to allow air entering by the
ash pit to pass between the bars.
The second portion of the apparatus consists of the furnace bars which are
preferably cast in pairs with very thin webs, nearly "knife edged" and tapered
so as to be considerably deeper at the back end next bridge, than at front end, the
spaces between the webs, forming channels in which the air, passing from the
'Dead plate" to the bridge is heated.
The third portion of the apparatus consists of a hollow Bridge, into which the
heated air is admitted after passing along between the bars, through openings
provided in the front part of the Bridge plate, and in the ledge on which they
rest while air can also be admitted from the ash pit by an adjustable door or

page_text: doors. In one form we make the Air passage from the hollow air box to curve
forward and open out in front of the brickwork, so as to deliver the heated air
over the fire amongst the gases and other products of the fuel and set up an intense
combustion.
In another form we make the hollow air box with passages by which the heated
Air entering from between the bars, or from the ash pit, passes up behind the bridge
to mix with the gases.
It will be seen that air more or less heated, may be directed in regulated
quantities, to act over the fuel, from front to back end of the furnace, or to the
hollow air box, either between the webs of Fire bars, or through the ash pit
underneath them, and when it reaches the air box it is then passed on to the
fuel, at the front of the bridge, or among the gases and other product behind the
Bridge.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Mace and John Brewster in the Great Seal Patent
Office on the 13th December 1883.
CHARLES MACE and JOHN BREWSTER of Sunderland in the County of Durham
Engineers IMPROVEMENTS IN APPARATUS FOR CONSUMING SMOKE
Our invention relates to certain appliances by which an adequate supply of
atmospheric air variable in quantity and in point of application can be admitted
to the Furnace by simple mechanism in such a manner as to effect complete
combustion of the fuel, thus preventing smoke while the efficiency of the
furnace is increased. The apparatus as a whole consists of the following. parts
namely:
The first portion of the apparatus is the "dead plate" formed with an air box or
boxes fitted with doors by which the admission of air can be regulated. The front
of the "dead plate" has openings through which the air after passing through the
box or boxes and being heated is thrown into the furnace, and open slots are also
provided in the ledge in which the fire bars rest to allow air entering by the ash
pit to pass between the bars
The second portion of the apparatus consists of the furnace bars which are
preferably cast in pairs with very thin webs nearly "knife edged" and tapered
so as to be considerably deeper at the back end next bridge than at front end the
spaces between the webs forming channels in which the air passing from the
dead plate" to the bridge is heated.
"
The third portion of the apparatus consists of a hollow bridge into which the
heated air is admitted after passing along between the bars through openings
provided in the front part of the Bridge plate and in the ledge on which they rest
while air can also be admitted from the ash pit by an adjustable door or doors.
In one form we make the air passage from the hollow air box to curve forward
and open out in front of the brick work so as to deliver the heated air over the
fire amongst the gases and other products of the fuel and set up an intense
combustion
In another form we make the hollow air box with passages by which the heated
air entering from between the bars, or from the ash pit, passes up behind the bridge
to mix with the gases
It will be seen that air more or less heated may be directed in regulated
quantities to act over the fuel from front to back end of the furnace or to the
hollow air box either between the webs of firebars or through the ash pit
underneath them and when it reaches the air box it is then passed on to the
fuel at the front of the bridge or among the gases and other products behind the
Bridge
DESCRIPTION OF DRAWINGS,
Figure 1. Shews an end view of a furnace fitted with our improved dead plate
one half view showing the front frame and revolving door (made according to
another patent held by us) Figure 2 Shews a section through a furnace fitted
with our dead plate bars and bridge with air channel curving back over fire in
front Figure 3 is a half cross section through line A. B of Figure 2 and Figure 4
a half plan on top of bars
Figure 5. is an end view of a furnace with our improved dead plate one half
view showing front frame with revolving door. Figure 6 is a section through a
furnace fitted with our dead-plate bars and bridge with air channels to back of
bridge. Figure 7 is a half cross section on line C D of Figure 6 and Figure 8 is a
half plan on top of bars.

page_text: مه
admitted by the adjustable doors 3, 3¹ to be heated before finding its way over
the fire by the slots, 4. 4' or under the fire into channels formed by webs of bars
by the slots 5.5 in ledge on which the fronts of bars rest, 6. 6. are the improved
bars shewn cast in pairs and with knife edged webs tapering from the ordinary
depth at dead-plate to about four times the depth at the bridge forming deep
channals between each pair of bars; 7 is the bridge formed with a hollow box or
boxes 8 with slots 99 to admit air after being heated in its passage along the
bars in quantities regulated by the door 10 worked from stoke hole by bar 11.
In the sloping ledge 12 of bridge are also slots 13. 13 by which air having been
heated by passing along the bars is admitted to the box or boxes 8 whence all the
air finds its way by the curved channel or channels 14 formed in the upper part
of Bridge over the fire at front of Bridge. The lower portion of Bridge 7 is fitted
with doors 15 by which a portion of air may be admitted behind the bridge if
necessary and which doors serve also for cleaning from behind.
7
:
The bridge on Figures 5. 6. 7 and 8 is shewn adapted for receiving the heated
air into a chamber 84 (corresponding with the boxes 8 on Figure 2) to be thence
conveyed through slots 16 into a box 17 formed in brick work of the bridge and
thence by slote or holes 18' to 'mix with the gases behind the bridge. The bridge
is fitted at lower part with doors as described in Figure 2.
The courses of the currents of air are indicated by the arrows.
Having now fully described and illustrated our invention and the mode in which
we have carried it into practical operation with success though we do not restrict
ourselves to precise details which may be varied to suit different forms of furnaces we
declare that what we claim as novel and secured to us by Letters Patent are the
following namely:
First Furnace bars with webs tapering from front so as to be considerably deeper
at back end, the spaces between forming channels in which the air is conducted
from front to back and heated in its passage substantially as shown and described
Second In combination with such bars a dead plate formed with a box or boxes
fitted with doors by which the admission of air to furnace (after being heated) can
be regulated and with alots in the ledge on which the bars rest to allow air to
enter between the webs to be heated substantially as shown and described
Third In combination with such bars a bridge formed to receive the heated air
(after passing along between the webs of bars) in a channel or channels curving
forwards and opening out over fire in front of bridge or in an alternative form
with a channel or channels by which the heated air from between the bars or
from the ash pit is conveyed behind the bridge substantially as shewn and
described
Fourth The combination of parts forming the smoke consuming apparatus
comprising the dead plate the tapered bars and the bridge by means of which
heated air in regulated quantity can be applied at the point most likely to effect
the complete combustion of the fuel substantially as shown and described
In witness whereof we the said Charles Mace and John Brewster have hereunto
set our hands and seals this twelfth day of December in the year of our Lord
one thousand eight hundred and eighty three.
Hot na TAR
Witness:
T. J DANSON F. Inst. P Agents
Consulting Engineer
Newcastle on Tyne
CHARLES MACE
JOHN BREWSTER (L.B.)