Improvements in Appliances for the Prevention of Smoke in the Furnaces of Steam Boilers and the like.
Year: 1899

page_text: Date of Application, 8th June, 1899
Complete Specification Left, 8th Mar., 1900—Accepted, 8th June, 1900
PROVISIONAL SPECIFICATION.
Improvements in Appliances for the Prevention of Smoke in the
Furnaces of Steam Boilers and the like.
We, WALTER ERNEST GREEN and EDWIN ARTHUR GREEN, of the Mitre Works,
Edward Street, Sheffield, Cutlery Manufacturers, WALTER FARRER, of 14, Leverton
Street, and JOSEPH FARRER, of 27, Meersbrook Park Road, both Mechanical
Engineers, JOSEPH HARDY, of 23, Tresswell Crescent, Mechanical Engineer and
Smoke Inspector, all of Sheffield, in the County of York, do hereby declare the
nature of our invention to be as follows:-
Although our invention is applicable to a variety of furnaces, such as metallur-
gical and the like, it is more particularly adapted for use in the furnaces of steam
boilers.
The object of our invention is the prevention of smoke and economy of
fuel, which we carry out in the following manner, and as the action of our
appliances will be the same in whatever kind of furnace it is employed, a de-
scription of it as applied to the furnace of a Cornish steam boiler will suffice.
We construct the fire door of such a boiler with an air chamber, which projects
inwards into the furnace, this air chamber we provide with air inlets both at
the top and bottom, and likewise with outlets or perforations at the back, and
in some cases we provide this air chamber with ribs, partitions, or tubes, to act
as heat conductors. In the fire door frame we provide top and bottom inlets or
ports, corresponding with those in the fire door, so that when the fire door is
closel, air can be admitted through these top and bottom openings into the air
chamber at the back of the fire door, and thence through the outlets or perfora-
tions into the furnace.
To these inlets or ports in the fire door frame we provide suitable doors or
flaps, by means of which the said inlets or ports may be opened or closed. These
air doors or flaps we so construct and provide with hinge spindles, cranks and
devers, that when the fire door is opened these top and bottom doors are likewise
opened and remain open after the fire door has been closed. The closing of
these air doors or flaps being automatically regulated by connection with a float
in a water tank or by what is known as a cataract or equivalent automatic
appliance. By disconnecting the regulator lever these doors can also be actuated
by hand.
In this way the admission of air into the furnace may be adjusted and regu-
lated as circumstances may require, and by the particular construction of the
air chamber, or chambers, at the back of the fire door, and the arrangement of
passages in the door frame, the air which is admitted to support combustion is
heated, and an economy in the consumption of fuel, as well as a reduction in
the formation of smoke is obtained.
T
L
1000

page_text: I
Improvements in Appliances for the Prevention of Smoke in the
Furnaces of Steam Boilers and the like.
We WALTER ERNEST GREEN and EDwi ARTHUR GREEN, of the Mitre Works,
Edward Street, Sheffield, Cutlery Manufacturers, WALTER FARRER, of 14, Leverton
Street, and JOSEPH FARRER, of 27, Meersbrook Park Road, both Mechanical
Engineers, JOSEPH HARDY,
of
23, Tresswell Crescent, Mechanical Engineer and
Smoke Inspector, all of Sheffield, in the County of York, do hereby declare the
nature of our invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:—
Although our invention is applicable to a variety of furnaces, such as metallur-
gical and the like, it is more particularly adapted for use in the furnaces of steam
boilers.
The object of our invention is the prevention of smoke and economy of
fuel, which we, carry out in the following manner, and as the action of our
appliances will be the same in whatever kind of furnace it is employed, a de-
scription of it as applied to the furnace of a Cornish steam boiler will suffice.
The nature of our invention will be better understood on reference to the accom-
panying sheet of drawings in which
Fig. 1 is a front elevation of a fire door and frame as fitted to a steam boiler
shewing the doors or flaps, for the admission of air to the furnace, and the fire
door all closed.
Fig. 2, is an end view of the same.
Fig. 3 is a sectional elevation of the same on the line A B.
Fig. 4 is an end view of the same shewing the regulator cylinder.
Fig. 5 is a plan in section on the line CD.
Fig. 6 is a front elevation of a fire door and frame shewing the fire door and
the doors or flaps for the admission of air to the furnace all fully open.
Fig. is a sectional elevation of the same on the line E F.
Fig. 8 is a plan of the same in section on the line CD.
Fig. 9 is an end view shewing the fire door closed and the doors or flaps for the
admission of air both open.
The same letters refer to similar parts throughout the several views.
We construct the fire door, a, of such a boiler with an air chamber, b, which
projects into the furnace when the door is closed, this air chamber we provide
with air inlets, c, c, both at the top and bottom and likewise with outlets or
perforations, d, d, at the back. In the fire door frame we provide top and
bottom inlets or ports, e, e, corresponding with those in the fire door, so that
when the fire door is closed air can be admitted through these top and bottom
openings into the air chamber, b, at the back of the fire door and thence through
the outlets or perforations, d, d, into the furnace.
To these inlets or ports, e, e, in the fire door frame we provide suitable doors
or flaps ff. by means of which the said inlets or ports may be opened or
closed. These air doors or flaps we so construct and provide with hinges and a
crank, g, also levers or connecting rods, h so that when the fire door is opened
these top and bottom doors, f, f¹, are likewise opened and remain open after the
fire door has been closed. The closing of these air doors or flaps is automatically
regulated by connecting them with a float in a water tank or by what is known as
a cataract or other equivalent automatic appliance, i. By disconnecting the
regulator lever or connecting rod, j, these doors f, f', can also be actuated by
hand.
By providing the lower end of the hinge spindle of the fire door with a worm

page_text: or cam, &, and providing the bottom air flap, f, with a projecting nib, /, arranged
to engage with the cam or worm, the act of opening the fire door turns the verti-
cal hinged spindle with its cam which actuates the flap, f', which in its turn
moves the crank, g, the lever or connecting rod, h, the top flap f, and the lever or
connecting rod in the cylinder of the regulator, i, and by which movement where
such an appliance as the one shewn in the drawing is employed, the fluid above
the piston in the cylinder is caused to flow through a self-acting valve to the
under side of the said piston, so that when the fire door is shut and the project-
ine nib on the lower flap, f', is disengaged from the cam then the weight of the
top flap and its connecting rod or in some cases with added weights, causes the
piston in the cylinder to descend upon which the valve closes and the fluid by
the weight of the parts last named is caused to flow through a port or orifice back
to the top side of the piston in the cylinder. The port or orifice being provided
with a cock or valve by means of which the flow of the fluid and the action of
the appliance is regulated.
In this way the admission of air into the furnace may be adjusted and regulated
as circumstances may require and by the particular construction of the air
chamber or chambers at the back of the fire door, and the arrangement of passages
in the door frame, the air which is admitted to support combustion is heated, and
an economy in the consumption of fuel as well as a reduction in the formation of
smoke is obtained.
In the foregoing specification we have described an automatic appliance
marked i, on the drawings for regulating the movements of the air doors f, f',
we have also described a furnace door constructed with a baffle plate so as to
form an air chamber but as we are aware that such appliances have been used
before for similar purposes we lay no claim to novelty in this respect.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
(1). In appliances for the prevention of smoke in the furnaces of steam boilers,
the particular arrangement and combination of parts comprising the furnace door
frame constructed with the air passages, e, the doors or flaps, f, f, with their
respective hinges, spindles, crank, levers or connecting rods by which the said
top and bottom doors, f, f', are actuated and opened by the movement of the
fire door, a, and by which the closing of the said doors f and f¹, is automatically
regulated by a cataract or equivalent automatic appliance, in the manner and
for, the purposes substantially as herein described and illustrated.
Dated this 7th day of March 1900.
R. HEBER RADFORD,
Agent for the Applicants.