Improvements in Apparatus for Condensing Smoke in the Furnaces of Steam and other Boilers.
Year: 1889

page_text: CUMPLEIN
Improvements in Apparatus for Condensing Smoke in the Furnaces
of Steam and other Boilers.
1 JOHN THOMAS ELLIS of 231 Barking Road Canning Town, in the County of
Essex, 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:-
My invention relates to further improvements on the smoke condensing device
described in the specification accompanying my application for Letters Patent filed
on the 6th May 1889 No. 7539 and refers to a smoke consuming apparatus more
particularly applicable to steam boilers of the Cornish, Lancashire, Galloway or other
similar class. My invention has for its object to act by means of two jets of
superheated steam upon the smoke at the roar of the furnace, and to bring the
same back to the front thereof causing it to form an eddy, so that its carbonaceous
constituents may be burnt by the fire intensified by a current of air admitted through
the partly opened furnace door, while the water contained therein is decomposed by
the great heat developed into its constituent gaseous elements. The external portion
of the smoke which may perhaps escape being carried away by the action of the
said superheated steam is deflected by a second fire bridge placed at the back of the
ordinary bridge and provided with perforations, such smoke being thus caused to
return to the front of the furnace. My invention further refers to a device for
automatically closing the furnace door.
Fig. 3
In the accompanying drawing Fig. 1 is a sectional elevation of my improved
apparatus applied to a Cornish boiler. Fig. 2 is a front elevation of the same.
is a front elevation of my perforated fire bridge and Fig. 4 is a sectional elevation of
my improved device for automatically closing the furnace door.
As shewn in Figs. 1 and 3 my apparatus consists essentially-1. of an additional
perforated fire bridge B built at the rear of the first or ordinary fire bridge and
extending in height to the top of the flue tube T. 2. of a steam pipe P conveying
steam from the dome o to the inside of the furnace and provided at its inner
extremity with a nozzle n having two slant perforations and resembling the fish tail
burner of a gas jet. 3. of a device (Fig. 4) for automatically closing the furnace
door d.
As shewn in Fig. 3 the perforations in the bridge Bare formed by omitting one or
more bricks at each alternate course of fire bricks.
The steam pipe R is provided at the top with a tap having a handle which is
opened or closed by one end of a cord or chain c the other end of which is fixed to
the vessel E of the closing device (Fig. 2).
The device for automatically closing the furnace door shewn separately in Fig. 4
consists of a tank F containing water in which the hollow vessel E plunges. At the
bottom of the said vessel is formed an opening H closed by a valve V so that when
not otherwise supported it will sink in the tank F, the water entering the vessel E
through the opening H. Another opening is formed at k to allow the water admitted
at H to escape through k. The weight of the vessel E is such that it will be over-
balanced by that of the furnace door d so that when the latter is opened the chain
or cord D which connects the door d with the vessel E will obviously be slackened
which allows the vessel E to sink in the water of the tank F and water to enter the
former at H.
When the door d is closed the weight of the water will make the vessel E so heavy
as to counterbalance the weight of the said door d thereby suspending it, and leaving
an aperture opened thereunder until sufficient water has escaped through to reduce
the weight of the vessel E and enable the door d to be entirely closed.

page_text: Whenever a charge of fuel has to be placed in the furnace the door d is opened
and the vessel E sinking turns by means of the cord or chain c the handle h opening
the tapt and admitting steam through the pipe P, which steam becomes superheated
in the furnace f. This steam rushes through the two slant perforations of the
nozzle n forming two jets jj which strike obliquely at the rear end of the grate
against the fire bridge and causes the smoke produced to be drawn back, in the
form of an eddy, towards the front of the furnace in order to have its carbonaceous
constituents burnt there by the fire intensified by the air admitted at the open
furnace door d while the water contained in such smoke is decomposed into its
constituent gaseous elements owing to the great heat developed in front of the
furnace f.
A portion of the smoke which may perchance have escaped the action of the
superheated steam and have passed over the bridge is deflected by the baffle
bridge B so as to be caught by the eddy and carried away to the front of the furnace f.
The fuel having been loaded the door d is closed first by hand and then gradually by
the automatically closing device above described which allows the door to remain
partly open until sufficient water has run out at h (Fig. 4), the time elapsing during
such closing being so calculated as to allow the admission of superheated steam and
air to continue as long as desirable.
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 :-
:-
1. The improved smoke consuming apparatus, hereinbefore described and shewn
in the accompanying drawings consisting of an additional perforated fire bridge in
combination with a superbeated steam pipe, conveying steam from the steam dome to
the furnace and provided with a perforated nozzle resembling a fish tail burner for
the purpose of acting upon the smoke at the rear end of the first or ordinary fire
bridge and of causing the said smoke to form an eddy so as to be brought back and
subjected to the action of the fire in the front of the furnace; the outer portion of
the said smoke which may possibly escape at first being subsequently deflected by the
additional fire bridge and carried away by the eddy to the fire.
2. In combination with the above claimed smoke consuming apparatus the improved
device for automatically closing the furnace door arranged combined and operating
substantially as and for the purpose described.
Dated this 3rd day of August 1889.
HUGHES, SON & Co.,
38, Chancery Lane, Agents.