Improvements in or connected with Smoke Consuming Furnaces and other Grates.
Year: 1894

page_text: Date of Application, 30th Jan., 1894-Accepted, 10th Mar., 1894
COMPLETE SPECIFICATION.
Improvements in or connected with Smoke Consuming Furnaces
and other Grates.
I, EDWARD GRIFFITH BREWER of 33 Chancery Lane in the County of
London and 30 East Parade, Leeds, in the County of York, Fellow of the
Chartered Institute of Patent Agents do hereby declare the nature of this invention
(a communication from Charles Bougier of Levallois-Perrat, France Engineer)
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
This invention refers to the construction and arrangement of a register or air
admittance device located under the firebars of the furnace, near to the ash pit
door, for heating the air which passes through the incandescent fuel by the action
of the draught produced from the chimney.
The invention will be best understood by describing same with reference to the
accompanying drawings.
Fig. 1 is a longitudinal section through a steam boiler furnace of ordinary
construction. Fig. 2 is a front view in perspective of the same furnace, the ash
pit door being open to show the internal parts. This apparatus is composed of
two jointed shutters made of sheet iron A and B, one at the top the other at the
base of the ash pit door. The lower shutter B rests on an angle piece P¹ Fig. 2
located on the side of the ash pit; the upper shutter A is adjustable in position
and can be turned about its hinge by means of a lever L, pivotted at 1, and
provided with a roller C to act on the upper shutter. This lever L is provided
with a spring catch bolt co-acting with the tooth sector S, in such manner that it
is easy by operating externally the lever L to adjust the shutter A, and
consequently to give more or less space between the two shutters A and B, the
minimum space is moreover regulated by the angle piece P Fig. 2, which is
adjustable, and prevents the complete closing of the shutters and the extinction of
the fire thereby. Owing to their situation in the ash pit below the grate the
shutters A and B are heated by the radiated heat from the furnace, and the air
coming from without, is directed as indicated by the arrows in Fig. 1 by the
shutter B, against which it passes onto the shutter A, which being nearer
the furnace has the highest temperature; this air owing to the draught from the
chimney then traverses the space left free between the two shutters and is greatly
heated before, and when it comes in contact with, the incandescent mass in the
furnace. Combustion is thus rendered more complete which produces consequently
an economy of fuel and improved smoke combustion. To increase the inlet of the
air, which is required in furnaces where rapid vaporization is to be effected, I
provide the upper shutter A with a winged ventilator V, which by its rotation
injects air under the fire place G. The shutters A and B may be lengthened at
will by means of a screw and slides and according to the heating surface desired to
be obtained they can be made in the form of a fan, when for example they are
used in furnaces with cylindrical fire places, and in order to avoid the passage of
the air between the edges of these shutters and the side of the ash pit, they may
be covered with fire brick or other convenient covering. For the cleaning-out of
the ash-pit the shutter B is brought into the position indicated by dotted lines
by B'.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In smoke consuming furnaces a registering apparatus, or air admittance
device, composed of two shutters situated in the ash pit, one shutter being
adjustable by an adjusting lever operated from the outside of the furnace, the said
shutter being exposed to the beat of the furnace, whereby the air passing between
the said shutters to the furnace becomes heated, and the quantity of air admitted
can be varied by adjustment of the shutter, the said air thus arriving at a high
temperature to the incandescent mass in the fireplace or furnace, whereby
improved combustion and economy is obtained all substantially as and for the
purposes herein before described.
2. In smoke consuming furnaces, as claimed by Claim 1, the combination with
the upper shutter of the register, of a ventilator with blades to inject an
additional supply of air under the grate, all substantially as and for the purpose
hereinbefore described and illustrated with reference to the accompanying
drawing.
Dated thin 20th dow of Ianuary 1801
BREWER & SON,
Agents.