IMPROVEMENTS IN OR CONNECTED WITH THE FURNACES OF STEAM BOILERS
Year: 1882

page_text: LETTERS PATENT to Willian Bell of Lancaster in the County of Lancaster
Iron Merchant for an Invention of "IMPROVEMENTS IN OR CONNECTED WITH
THE FURNACES OF STEAM BOILERS
""
PROVISIONAL SPECIFICATION left by the said William Bell at the Office
of the Commissioners of Patents on the 29th June 1882.
WILLIAM BELL of Lancaster in the County of Lancaster Iron Merchant
"IMPROVEMENTS IN OR CONNECTED WITH THE FURNACES OF STEAM BOILERS."
My Invention relates to improvements in or connected with the furnaces of
Steam Boilers and has for its object to effect economy in the consumption of fuel
and to consume smoke.
According to my said Invention a bearer is formed at the back of the fire bars
upon which bearer is mounted a bridge which fills or nearly fills the vertical space
at the back of the fire bars above the said bearer. A hollow arch or double flue is
formed in the boiler flue at the back of the said bridge which arch consists of two
parallel flues both being closed at the end towards the fire.
There is a space
between the upper part of the said arch and the top of the boiler flue and the
upper of the parallel flues at the end farthest from the fire is in communication
with this space. The said upper parallel flue is in communication with the lower
parallel flue at the end nearest to the fire and the said lower parallel flue at. its
other end opens into a due running beneath the boiler and opening (by side flues
Prunning partly around the furnace end of the boiler) into flues leading to the
Chimney.
The before mentioned Bridge has a number of passages of semi circular or other
form at its upper edge presented to the boiler flue and a number of perforations
through its main body these said passages and perforations forming communi-
cations from the fire place to the small chamber which is left between the back of
the said bridge and. the closing wall of the forward end of the parallel flues which
chamber is or may be filled with a porous substance through which the products of
combustion pass

page_text: A long slit or passage or passages is or are made through the before mentioned
bearer giving communication for air from the ash pit to the lower part of the
aforesaid chamber at the back of the bridge. Tubes pipes or passages for air are
or may be arranged above the fire place opening at one end to the air outside the
front of the furnace and at the other end to the passages or some of the passages
in the edge of the bridge. With the parts arranged as described the products of
combustion pass from the fire place along and through the passages or perforations
in the bridge whence they meet with hot air supplied by the pipes aforesaid when
such are used. The said products thence pass into the chamber at the back of the
bridge and here meet with the hot air supplied through the before mentioned
bearer. The said products pass from the said Chamber along the space between
the arch or top of the parallel flues and the boiler flue and therefrom into the
upper of the said parallel flues and back therealong and thence into the lower of
the parallel flues and therealong and therefrom into the flue beneath the boiler
and back therealong into the side flues and thence to the chimney The air which
is beated as it passes through the bearer and through the pipes or passages above
the fire meets the products of combustion in a manner most favorably to the
consumption of smoke
A fan or equivalent device may be employed if desired to cause the smoke to
be passed several times over the fire

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Bell in the Great Seal Patent Office on the 29th December
1882.
WILLIAM BELL of Lancaster in the County of Lancaster Iron Merchant
"IMPROVEMENTS IN OR CONNECTED WITH FURNACES FOR STEAM BOILERS
"
My Invention relates to Improvements in or connected with the furnaces of
Steam Boilers and has for its object to effect economy in the consumption of fuel
and to consume smoke.
And in order that my said Invention may he properly understood I will now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawings the saine letters of reference
indicating corresponding parts in both the figures.
Figure 1 represents in longitudinal section and figure 2 in transverse section a
boiler provided with a furnace and flues arranged according to my Invention.
According to my said Invention a bearer or wall A is formed at the back of the
fire bars which bearer or wall nearly fills the vertical space at the back of the fire
bars leaving a space between its top and the inside of the boiler flue as shewn in
the drawings. A hollow arch B is formed in the boiler flue E the said arch com-
mencing at the wall A which arch and the dividing wall C beneath it constitute
parallel flues B C² both being closed at the end towards the fire by the wall A.
There is a space at D between the upper part of the arch B and the top of the
boiler flue E and the flue B2 at the end b farthest from the fire is in communication
with this space D. The said flue B is in communication with the lower parallel
flue Cat the end c nearest to the fire and the said flue C² at its other end ƒ opens
into a flue Frunning beneath the boiler and opening by side flues (not shewn in
the drawings which flues run partly around the furnace and of the boiler) into
Blues leading to the chimney. Tubes pipes or passages y g for air are or may be
arranged above the fire place the said tubes pipes or passages opening at one end
to the air outside the front of the furnace and at the other end to the space above
the arch B. With the parts arranged as described and illustrated the products of
combustion pass over the top of the wall A where they meet with hot air supplied
by the tubes pipes or passages gg when such are used; the said products thence
pass along the space D between the arch B and the boiler flue E and therefrom
into the upper flue B' and back therealong and thence into the lower flue C³ and
therealong and therefrom into the flue F beneath the boiler and back therefrom
into the side flues and thence to the chimney. The air which passes through the
tubes pipes or passages g g above the fire meets the products of combustion in a
manner most favorable to the consumption of smoke.
A fan or equivalent device may be employed if desired to cause the smoke to
pass several times over the fire.
Having now described and particularly ascertained the nature of my said
Invention and the manner in which the same is or may be used or carried into
effect I would observe in conclusion that what I consider to be novel and original
and therefore claim as the Invention secured to me by the hereinbefore in part
recited Letters Patent is :-
First. Providing the flues of Steam Boilers with an arch (B) which leaves a
small space between itself and the inner side of the boiler flue the said arch
constituting a return flue closed at the end nearest the fire substantially as herein-
before described and illustrated in the accompanying drawings.
Second. The combination with the arch arranged as claimed by the preceding
claiming clause of a division (C) so as to constitute with the said arch parallel

page_text: flues or passages whether there be used or not a further passage or return flue (F)
substantially as hereinbefore described and illustrated in the accompanying
drawing.
Third. In combination with an arch arranged as claimed by the preceding
claiming clauses the air tubes pipes or passages (99) arranged for conducting air to
the products of combustion as they pass into the space above the said arch
substantially as herein before described and illustrated in the accompanying
Drawing.
In witness whereof I the said William Bell have to this my Specification
set my hand and seal this twenty eighth day of December One thousand
eight hundred and eighty two.
WILLIAM "BELL (L.s.)