IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES
Year: 1884

page_text: I ADAM CYRUS ENGERT of Three Mills Lane Bromley by Bow in the County
of Middlesex Engineer do hereby declare the nature of my Invention for
"IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES" to be as follows:-
The object of my Invention is to produce a rapid draft in steam boiler and other
furnaces without the use of a forced draft produced by a fan or steam jet and so to
obtain a better combustion of the fuel.
In the case of a steam boiler having an internal flue or flues I preferably
somewhat increase the height of the bridge at the back of the furnace so as to
diminish the space between it and the top of the furnace flue and I decrease
the length of the space at present occupied by the fire bars, by blocking up say
one half or more of the back portion of the grate surface preferably with brick work.
The upper surface of the brickwork I make to incline downwards from the arch to
the fire bars the incline should be sufficiently steep to cause fuel resting upon it
to tend always to roll downwards towards the front.
The fire bars may if desired be inclined somewhat upwards towards the front or
may at the front be bent somewhat upwards to prevent fuel from falling from
them or a separate inclined grating might be placed at the front to effect the same
object. Or the bars might be left without any such guard at the front.
At a short distance below the fire bars I fix a plate inclining upwards from the
front of the ash pit to the back of the fire bars so as to form a funnel shaped
passage by which air can pass to the fire. The remainder of the ash pit I close up
entirely. The opening at the front of the furnace above the fire bars I make as
nearly as may be of the whole width and height of the furnace.
In front of this
opening I fix a shallow box within which I hang a plate or "blower." This plate
is made to fit to the sides of the box and come down to within a short distance of
the fire bars. Through the lower part of the plate openings are also formed to
admit air to the furnace and a slide may be provided to more or less close these
openings.
The plate can also be allowed to hang vertically or can be turned outwards at an
angle so that more or less air may be allowed to pass below the plate to the
furnace. The plate can also be turned upwards and held out of the way whenever
fresh fuel has to be supplied to the fire or in some forms of furnaces the fuel might
be fed into the furnace from the top instead of from the front. Another plate

page_text: •
might if desired be hung at the front of the shallow box to prevent heat being lost
by radiation sufficient space being left between the plates for air to enter between
them and pass to the fire.
A damper may be applied in the chimney flue which may be more or less
closed at the time when the front of the furnace is opened for fresh fuel to be
put on.
Other furnaces may be formed in the same way.
In short boilers where a long length of flame is not required the ash pit might
be entirely closed and the draft be allowed to enter only at the front above the
fire bars.

page_text: L
I ADAM CYRUS ENGERT of Three Mills Lane Bromley by Bow in the County
of Middlesex Engineer do hereby declare the nature of my Invention for
"IMPROVEMENTS IN 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 :-
The object of my Invention is to producé a rapid draft in steam boiler and
other furnaces with the use of a forced draft produced by a fan or steam jet and so
to obtain a better combustion of the fuel.
I make the grate or surface upon which the fuel is to rest to slope downwards
from back to front-this surface may either be formed entirely of fire bars or it
may be partly of fire bars and partly of fire brick.
The opening at the front of the furnace above the fire bars I make as nearly as
may be of the whole width and height of the furnace. In front of this opening
I fix a shallow box within which I bang a plate or "blower." This plate
made
to fit to the sides of the box and come down to within a short distance of the fire
bars. Through the lower part of the plate openings are also formed to admit air
to the furnace and a slide may be provided to more or less close these openings.
The plate can also be allowed to hang vertically or can be turned outwards at an
angle so that more or less air may be allowed to pass below the plate to the
furnace. The plate can also be turned upwards and held out of the way when
ever fresh fuel has to be supplied to the fire.
At a short distance below the fire bars I fix a plate or fire brick inclining
upwards from the front of the ash pit to the back of the fire bars so as to form a
funnel shaped passage by which air can pass to the fire. The remainder of the ash
pit I close up entirely.
•
In some forms of furnaces the fuel might be fed into the furnace from the top
instead of from the front. Another plate or door might also if desired be hung at
the front of the shallow box to prevent heat being lost by radiation sufficient
space being left between the plates for air to enter between them and pass to
the fire.
A damper may be applied in the chimney flue which may be more or less closed
at the time when the front of the furnace is opened for fresh fuel to be put on or
according to the heat required.
In short boilers where a long length of flame is not required the ash pit might
be entirely closed and the draft be allowed to enter only at the front through slots
or openings in the bottom of the box and through front bars if any front bars be
used. Nearly the whole grate or surface upon which the fuel rests would in this
case be formed of fire brick,
In the Drawings hereunto annexed I have shewn examples of steam boiler
furnaces constructed as above described.
Figure 1 is a longitudinal section and Figure 2 a front view with one half in
section of a horizontal boiler with two internal furnace flues and with the furnaces
at the front end of these flues constructed in the manner above described.
Figure 3 is a longitudinal section of a similar boiler. showing in dotted lines the
way in which the furnace would heretofore usually have been constructed whilst
the full lines shew the changes which I make in it.
Figure 4 is a longitudinal section and Figure 5 a front view of a horizontal
boiler with the furnace formed below it in brickwork,

page_text: Figure 6 is a longitudinal section of an ordinary marine boiler fitted with the
furnace.
Figure 7 is a longitudinal section of part of an ordinary locomotive boiler with
the same construction of furnace applied to it.
In Figures 1, 2 and 3 A is brickwork above where the back set of fire bars
would have been in furnaces of the usual old construction. The bridge I usually
set somewhat further back in the flue as shewn at A*. B are the fire bars sloping
downwards from the bridge to the front of the furnace. CC are boxes or casings
secured to the front of the boiler. Each box is in front of one of the boiler flues.
D is a plate hung within each box-it fits to the sides and top of the box but there
is an opening between it and the bottom of the box for air to pass to the fire.
Holes are also formed through the lower part of this plate by which air can enter.
E is a furnace door by which each box Ċ is closed at the front with the exception
of an opening below the bottom of the door to allow air to enter. F F are handles
on the axes of the plates D by means of which the plates can be held at any
desired angle and by means of which the plates can be turned upwards so as to be
out of the way at the time when fresh fuel has to be fed into the furnace. G Gare
fire brick plates at the sides of the furnace so that the width of the furnace from
top to bottom is the same as the width of the grate.
In Figures 4 and 5 the plate D is shewn to have a chain D* attached to it by
which it can be raised or lowered and the furnace is formed with a second
bridge A in other respects the construction is the same as shewn at Figures 1, 2
and 3.
In Figure 6 also, which, shews the furnace adapted to a marine boiler and in
Figure 7 which shews the furnace adapted to a locomotive the parts are marked
with the same letters of reference as in Figures 1, 2, 3, 4 and 5 so that it is
unnecessary to further describe them.
Other furnaces than steam boiler furnaces may be constructed in the manner
herein before described.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is :-
First. The construction of steam boiler and other furnaces with the grate sloping
downwards towards the front in combination with a hanging plate or blower at
the front which extends downwards from the top of the furnace flue to within a'
short distance from the top of the grate so that air passing between them goes
directly on to the fuel which is resting on the grate substantially as described.
Second. The construction of steam boiler and other furnaces with thec grate
sloping downwards towards the front in combination with a hanging plate or
blower at the front which extends downwards from the top of the furnace flue
to within a short distance from the top of the grate so that air passing between:
them goes directly on to the fuel which is resting on the grate and also in addition
with the bottom of the ash pit made to slope upwards from front to back so as to
form a tapering air inlet below the bars substantially as described.