Improvements in Steam Boiler Furnaces for the Consumption of Smoke and Economy of Fuel.
Year: 1892

page_text: Date of Application, 24th Aug., 1892
Complete Specification Left, 20th May, 1893-Accepted, 22nd July, 1393
PROVISIONAL SPECIFICATION.
Improvements in Steam Boiler Furnaces for the Consumption of
Smoke and Economy of Fuel.
We, JOSEPH BOYES, of 16 Bromley Street, Hanging Heaton, near Dewsbury,
Yorkshire, Engineer, and THOMAS KELSELL, of 28 Carr Street, Batley Carr,
near Dewsbury, aforesaid, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention consists in a new or improved method of admitting atmospheric
air to the front of the furnace and at the bridge end, which atmospheric air is
heated to a suitable temperature before being admitted to the furnace, so that the
gases arising from the fuel is ignited which prevents smoke whilst at the same time
lessens the consumption of the fuel. A suitable arrangement of diaphragm or plate
valves are employed for letting in and shutting off the entrance of air into the
furnace.
In carrying out one portion of our invention, we fix to the inner side of the furnace
door a grate or perforated plate. This plate or grate is so fixed as to leave or form
a chamber between the furnace door and grate the upper end of which chamber is
connected with another chamber or funnel open to the atmosphere but in this upper
chamber or funnel we place a diaphragm valve or oscillating plate which can be
opened and closed at will for the admission of air which on entering impinges
against certain hot plates and on passing through the perforated plate or grate has
become so heated as to ignite the gases arising from the furnace.
We also arrange for the introduction of hot air at the bridge end of the furnace,
and to do this the back grate bars are formed with an elbow or bend which may or
may not form a portion of the bridge, but the bent portion of the bars form a grate
which however may be separate from the bars if thought desirable. Underneath
this grate is a. suitable form of chamber also provided with a diaphragm or
Oscillating plate valve which can be opened and closed for the admission of air
which on passing though the grate bridge has become heated and will ignite the
gases in the furnace, by which means smoke is prevented from passing up the
chimney and the fuel economised. Although the two valves for the admission of
air to the furnace may be operated by an attendant, we propose to open them each
time the furnace door is opened which is effected by a suitable arrangement of
levers and rods acted upon by studs or fingers on the furnace door being opened,
but on the door being closed we propose to employ automatic apparatus for closing
the said valves which we prefer to remain open some little time after the furnace
door has been closed. The apparatus for automatically closing these valves may
be effected by a suitable arrangement of wheels and worms operated by suitable
rotary shaft. On one of the studs or shafts of the worm gearing we mount a
weighted lever to one end of which is connected a rod which is in communication
with other rods connected to the valves, so that after the furnace door has been
closed, the worms and wheels operate the weighted lever which self actingly closes
the valves. A suitable form of brake or strap is employed to retard the movement
of the weighted lever, and it will be obvious that the valves may be closed sooner
or later according to the number of teeth in the wheels and speed at which
they run.
Dated this 23rd day of August 1892.
TASKER & CROSSLEY,
Halifax, Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam Boiler Furnaces for the Consumption of
Smoke and Economy of Fuel.
We, JOSEPH BOYES, of 16, Bromley Street, Hanging Heaton, near Dewsbury,
Yorkshire, Engineer, and THOMAS KELSELL, of 28, Carr Street, Batley Carr,
near Dewsbury, aforesaid 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 :-
This invention consists in a new or improved method of admitting atmospheric
air to the front of the furnace and at the bridge end, which atmospheric air is
heated to a suitable temperature before being admitted to the furnace, so that the
gases arising from the fuel are ignited which prevents smoke, whilst at the same
time lessens the consumption of the fuel. A suitable arrangement of diaphragm or
plate valves are employed for letting in and shutting off the entrance of air into
the furnace.
Such being the nature and object of our invention we will now proceed to
describe the same more fully, and for that purpose make reference to the accom-
panying sheets of drawings illustrative thereof, wherein
Fig. 1 is front elevation of a two-flued steam boiler having our improvements
applied thereto, and Fig. 2 is a cross section of the boiler and furnace.
A represents the boiler, and B the flues or furnaces having grate bars C and a
dead plate D, all as usual. The furnace door is represented at E, and it has
attached to it by suitable bolts, a grate F leaving a space between the door and the
said grate. The upper portion of the space is in communication with a chamber G
shewn in cross section Fig. 3, the said chamber comprising a plate H portions of
which are made in the form of a grate as shewn at I in cross section Fig. 4. The
chamber G is also in communication with another chamber J in which is a diaphragm
or oscillating plate L employed for the purpose of allowing atmospheric air to enter
the said chamber G or for shutting off the entrance of atmospheric air. When the
diaphragm L is opened, cold air enters the chamber and on impinging against the
hot plate H the air becomes heated and on entering the space behind the furnace
door, the heat of the air becomes highly intensified and as
passes through the
apertures in the grate F it intermingles with the gases arising from the fuel,
whereby such gases arc ignited and the smoke consumed consequently economy in
fuel is insured. The diaphragm L could easily be operated by the workman, but
we prefer to operate the diaphragm automatically and this is effected in the
following manner :-On the axis M of the diaphragın L is a bevil wheel N gearing
with another bevil whcel O on the top of a vertical shaft or rod P, on the lower
end of which, is a bent finger Q so placed that on the furnace door being opened it
strikes the said finger Q in such a manner as to oscillate the vertical shaft P
whereby the two bevil wheels are operated, and the diaphragm caused to assume a
vertical position in the chamber, whereupon cold air fushes into the said chamber
and becoming heated in the manner already described, enters the furnace for the
purpose of igniting the gases arising from the fuel. As we prefer that the
diaphragm should remain open for a short time after the furnace door has been
closed, we employ a suitable arrangement of wheels and worms to close the
diaphragm self-actingly at any given time, and this we propose to do in the
following manner :-On the axis of the diaphragm we fix a lever arm R connected
by rod or cord S to a three armed lever T placed loosely on the boss of one of the
two pulleys U fixed upon a slowly revolving shaft V driven by the worms and
wheels W shewn in Fig. 1 and again in Fig. 5. The horizontal shaft V is driven
by cord or strap X from any convenient source giving motion to pulley Y and to
the worms and wheels already referred to. The three armed lever T carries a
brake Z forced upon the peripheries of the pulleys U by spiral spring a the

page_text: pressure of which brake upon the pulleys can be regulated by the adjustable nut b,
therefore when the furnace door has been opened and the vertical shaft P partially
oscillated for the purpose of opening the diaphragm the slow rotary motion of
pulleys U continues to revolve, in doing which the brake Z is carried partially
around, and with it, the three armed weighted lever T, and by the time the three
armed lever assumes a horizontal position as shewn in Fig. 2 the diaphragm will
have been closed and the admission of cold air stopped. It will be obvious in
consequence of the closing of the diaphragm being gradual that the quantity of
cold air admitted to the chamber is gradually stopped. We also propose to admit
cold air under the bridge of the furnace as shown in Fig. 6, the bridge in this case
is composed of a grate A' a chamber being left behind the grate and the brickwork
in the furnace. A chamber B' is here employed provided with a diaphragm L'
connected by short lever and rod C' to bell crank lever D' which in turn is
connected to another rod E' attached to a lever arm F' fixed on the axis of the
first mentioned diaphragm L, so that on the furnace door being opened and the
vertical shaft P partially turned around, both diaphragms are opened simul-
taneously by the arrangement of worms and wheels shewn in Figs. 1 and 5.
By the admission of cold air into hot chambers and by the entrance of the
heated air from the chambers to the front and back of the furnace as herein
described, the emission of smoke is absolutely prevented whilst great economy of
fuel is insured.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be perforined, we declare that what we
claim is :-
Firstly. In steam boiler furnaces, the formation of chambers G and J in
combination with a diaphragm, employed in the manner and for the purpose set
forth herein.
Secondly. In steam boiler furnaces, the formation of chambers G and J, and
diaphragm L, the latter of which is operated by the opening of the furnace door,
in manner substantially as herein shewn and described.
Thirdly. In steam boiler furnaces, the formation of chambers G and J having a
diaphragm operated by the opening of the furnace door, in combination with the
three armed lever T, and the means or method of closing the diaphragm self-
actingly, all as herein shewn and described.
Fourthly. In steam boiler furnaces, the formation of chambers G and J at the
front of the furnace and chamber B' at the back of the furnace, having
diaphragms Land L' operated by the opening of the furnace door, substantially
in the manner as herein shewn and described.
Lastly. In steam boiler furnaces, the formation of chambers G and J at the front
of the furnace, and chamber B' at the back of the furnace, having diaphragms L
and L' operated by the opening of the furnace door, in combination with automatic
apparatus, substantially as shewn and described for closing the diaphragms.
Dated this 18th day of May 1893.
TASKER & CROSSLEY,
Halifax, Agents.