Improvements in Steam Boiler Furnaces.
Year: 1895

page_text: Date of Application, 26th Feb., 1895
Complete Specification Left, 20th Nov.. 1895-Accepted, 1st Feb.,
1896
PROVISIONAL SPECIFICATION.
Improvements in Steam Boiler Furnaces.
I, ENOCH RENSlow Rolfe Hoyt, of Madison Street, Brooklyn, New York
State, U.S.A., Draughtsman, do hereby declare the nature of this invention to be
as follows:-
This invention consists in the combination with the combustion chamber and
bridge wall of a furnace, of a series of heating plates arranged in the rear of the
bridge wall and forming a series of air passages; of a cover plate arranged over
the space between the bridge wall and heating plates; of a Hue arranged to
conduct air to the chamber between the bridge wall and the heating plates; and of a
damper for regulating the exit of air from such chamber.
The object of the invention is to provide a furnace in which the carbon distilled
by the combustion of fuel will be combined with the heated oxygen and thus form
carbonic acid or carbon dioxide, and further to insure the uniform heating of
the air admitted into the furnace for the purpose of supplying the necessary
oxygen.
Dated this 26th day of February 1895.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant:
Improvements in Steam Boiler Furnaces.
I, ENOCH RENSLOW ROLFE HOYT, of Madison Street, Brooklyn, New York
State, U.S.A., Draughtsman, 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 :-
The object of this invention is to provide a furnace in which the carbon distilled
by the combustion of fuel will be combined with the heated oxygen and thus form
carbonic acid or carbon dioxide and further to ensure the uniform heating of the
air admitted into the furnace for the purpose of supplying the necessary oxygen.
The invention consists in the combination with the combustion chamber and bridge
wall of a furnace, of a series of heating plates arranged in the rear of the bridge
wall and forming a series of air passages; of a cover plate arranged over the space
between the bridge wall and heating plates; of a flue arranged to conduct air to
the chamber between the bridge wall and the heating plates; and of a damper for
regulating the exit of air from such chamber.
In the accompanying drawing
Fig. 1 is an elevation of a boiler and a vertical longitudinal section of a furnace
with the inprovements of this invention applied thereto.
Fig. 2 a front elevation of the same with the front wall removed.
Fig. 3 a plan view of the bridge wall and a portion of the combustion chamber.
Fig. 4 a.front elevation of the series of heating plates.
Fig. 5 a transverse vertical section on line x-x of Fig. 4..
clamation of the heating plates.

page_text: Figs. 7, 8, 9, are respectively a detail plan, front elevation and rear elevation of
one of the interior plates of the series of heating plates.
A are the furnace walls and support for the boiler B, which and the grate C in
the combustion chamber of the furnace may be of any suitable size and material.
The rear end of the bridge wall is preferably inclined as shewn in Fig. 1 and in
rear of such wall are arranged a series of heating plates E, and the chamber F
formed between the bridge wall and the heating plates has a metal cover G. The
upper surface of the bridge wall is cut away at the rear end to form a seat for the
forward edge of the cover G which is preferably provided with a series of
longitudinal grooves or corrugations g. (Figs. 2, 3).
The heating plates E are arranged to form a series of horizontal air passages K,
and in the bridge wall are formed a series of flues H which connect the chamber F
with the space below the grate C. The air passages K are formed by aligned
grooves provided in the contiguous faces of adjacent heating plates, such passages
gradually increasing in breadth (Figs. 5 and 7) and decreasing in height from their
forward to their rear ends, thus the forward ends of the air passages K are
substantially circular in cross section whilst at the rear they appear as narrow slits.
The grooves on the faces of the plates except the outside ones, are not opposite
each other but intermediate between those on the other side of the plate so that
when the plates are assembled, the air passages between every pair of plates will
lie in different vertical planes from the horizontal rows of air passages next above
and below. The top and bottom plates of the series are provided with grooves on
only one face as shewn. The plates E are made of different widths and so arranged
that the rear end or edge of each plate projects slightly beyond the corresponding
end or edge of the next lowest plate of the series. By this construction which is
more clearly shewn in Fig. 5 of the drawing the air escaping from the air passages
comes in contact with the projecting plate ends above it which are the hottest
parts of the plates, the air therefore being subjected to the greatest heat as it
escapes from the air passages.
In order that the volume of air passing through the passages K formed by the
plates E may be regulated or entirely shut off a damper L is arranged within the
chamber F, between the bridge wall and heating plates. To the damper is
connected one end of an arm M, the other end of which is connected to an
operating rod N, extending through the front wall of the furnace so that the
damper may be easily operated.
The application of the improvements of this invention is not restricted to the
particular kind of furnace shewn and described but may be effected also in other
forms of furnaces.
Having now particularly described and ascertained the nature of my said inven-
tion and in what mauner the same is to be performed, I declare that what I
claim is
1. In a furnace, the combination with a combustion chamber and bridge wall, of
a series of heating plates arranged in rear of the bridge wall and forming the rear
wall of a heating chamber, a series of air passages, a corrugated plate arranged
across the chamber between the bridge wall and heating plates, and a flue arranged
to conduct air from below the grate of the furnace to the chamber between the
bridge wall and the wall formed by the heating plates, substantially as described
and shewn.
2. In a furnace, the combination with a combustion chamber and bridge wall, of
a series of heating plates placed upon each other arranged in rear of the bridge
wall and provided with a series of air. passages which increase in width and
decrease in height from their forward to their rear ends, a plate arranged over the
space between the bridge wall and the wall formed by the heating plates, and a
flue arranged in the bridge wall to conduct air from below the grate in the furnace
to the chamber between said bridge wall and heating plates, substantially as
described and shewn.

page_text: 3. In a furnace, the combination with a combustion chamber and bridge wall,.
of a series of heating plates arranged in rear of the bridge wall and forming the
rear wall of a heating chamber, a series of air passages formed in said plates, a
corrugated plate covering the space between the bridge wall and the wall formed
by the heating plates, a damper arranged in the chamber between such plates and
bridge wall controlling the exit of the air from said heating chamber, and a flue-
arranged to conduct air to such heating chamber, substantially as described and
shewn.
.
4. In a furnace, the combination with a combustion chamber and bridge wall, of
a series of heating plates arranged in rear of the bridge wall and forming a series
of air passages, said plates being of different widths and arranged so that the rear
end of each plate projects slightly beyond the corresponding end of the next lowest
plate in the series, a plate arranged over the space between the bridge wall and
heating plates, and a flue arranged to conduct air to the heating chamber formed.
between the bridge wall and heating plates, substantially as described and
shewn.
5. In a furnace, the combination with a combustion chamber and bridge wall, of
a series of plates arranged in rear of the bridge wall and having grooves formed
in their upper and lower faces, whereby when the plates are assembled a series of
air passages are formed between every pair of plates, said passages increase in
width, and decrease in height from their forward to their rear sides, a cover plate
arranged over the space between the bridge wall and heating plates, and a flue
arranged to conduct air from below the grate in the furnace to the heating chamber
formed between the bridge wall and heating plates, substantially as described and
shewn.
6. In a furnace, the combination with a combustion chamber and bridge wall, of
a series of heating plates arranged in rear of the bridge wall and having grooves
formed in their faces, whereby when the plates are assembled a series of air
passages are formed between each pair of plates, the passages between each pair of
plates being out of vertical alignment with the passages next above and below
them, a cover plate arranged over the space between said plates and wall, and a
flue arranged to conduct air from below the grate in the furnace to the heating
chamber formed between the bridge wall and heating plates, substantially as
described and shewn.
7. In a furnace, the combination with a combustion chamber and bridge wall, of
a series of plates arranged in rear of the bridge wall and forming a series of air-
passages which increase in width and decrease in height from their forward to their
ends, said plates being of different widths and so arranged that the rear end of each
plate projects slightly beyond the rear end of the next lowest plate in the series,.
a metallic plate arranged over the heating chamber formed between the bridge
wall and heating plates, a series of flues arranged in the bridge wall to conduct air
from below the grate in the furnace to the heating chamber between the bridge-
wall and heating plates, and a damper arranged in said heating chamber,.
substantially as described and shewn.
Dated this 20th day of November 1895.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant..