Improvements in and connected with the Furnace Flues of Steam Boilers.
Year: 1899

page_text: Date of Application, 15th May, 1899
Complete Specification Left, 15th Feb., 1900-Accepted, 12th May, 1900
Improvements in and connected with the Furnace Flues of Steam
Boilers.
JOHN IRELAND BOOKER, Engineer, 61, Tong Road, New Wortley, Leeds, York-
shire. I do hereby declare the nature of this invention to be as follows:-
An improvement in furnaces & flues corrugated and otherwise of the wing type,
of marine and other boilers.
My invention consists in the formation of the back end flange, and its relative
position, to the vertical centre of the tube plate & tubes, and of its being at the
same time of an interchangeable type.
Hitherto the formation of the back ends of corrugated and other furnaces, have
been manufactured, without taking into consideration the equalization of the
current of flame and heated gases, into the whole of the tubes that lead out of the
combustion chamber, and in the majority of cases hitherto, especially as regards
the wing furnaces, the flame and heated gases from the fuel are more drawn to
the tubes that are in the nearest portion of the combustion chamber, and in
being so. drawn the gases are more drawn through the tubes that are next to the
inner or more central portion of the boiler.
Now my improvement consists in causing the manufacture of the back end
portion to be so formed that the heated gases and flame will pass more centrally
to the tubes in its escape from the furnace back end on its entrance into the
combustion chamber. This formation at the same time causes the furnace to
be an interchangeable one, the flanges of which do not need contracting. To
effect this improvement in winged furnaces (or the centre furnaces of four furnace
marine boilers) I close in horizontally the side of the back end of the furnace,
that is that side that is nearest to the vertical centre of a marine boiler, thus
forming an outlet portion or neck, that is eccentric horizontally, or an horizontal
eccentric end, which thus causes the centre of the outlet portion or neck of the
furnace that leads to the combustion chamber to be moved horizontally away from
the centre of the body of the furnace and thus be more central to the vertical
centre of the tube plate and tubes of a wing combustion box or chamber than
what the vertical centre of the body of the flue is. Now in closing in the side
of the back end of the furnace horizontally as described the portion nearest to
the vertical centre of the boiler is so formed that, when the flange that side is
formed, this said flange whether joggled or unjoggled at the corner does not
project past the diameter of the body of furnace caused through the centre of
the neck or outlet portion being moved horizontally out or away from the
centre of the body of the furnace which not only effects the gases being led more
centrally to the tubes in the tube plate, but also ensures the furnace being with-
drawn horizontally from the boiler when required.

page_text: .
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Improvement in and connected with the Furnaces Flues of Steam
Boilers.
I, JOHN IRELAND BOOKER, Engineer, late of 61, Tong Road, New Wortley,
Leeds, Yorkshire, now of 97, Burns Road, Harlesden, in the County of Middlesex,
do hereby declare the nature of this invention and in what manner the same is
to be performed, to be parficularly described and ascertained in and by the
following statement: --
This invention relates to improvements in the furnaces of steam boilers and is
specially applicable to the wing furnaces of boilers of the marine type.
The primary object of the invention is the construction of a furnace which
can be so placed relatively to a, combustion chamber and boiler of ordinary
design that the products of combustion are more equally distributed amongst the
tubes than is the case in furnaces as hitherto manufactured. Furnaces according
to this invention have the further advantage of being readily inserted and removed
from the boiler.
In carrying out this invention the furnace is made so that the neck and flanges
at the back end, i.e. the end adjacent to the combustion chamber, are eccentric
to the body of the furnace, the eccentricity being in a horizontal direction and
away from the centre line of the boiler when the furnace is fitted in- position.
In addition to being eccentric to the body of the furnace the opening at the back
end is slightly reduced in diameter, the neck being contracted at the side adjacent
to the centre line of the boiler. The upper flange which partially surrounds
the back end of the furnace is so shaped that its point of juncture with the lower
flange on the side adjacent to the vertical centre line of the boiler.comes on or
near the horizontal centre line of the furnace body and is within the radius of
such body. This construction renders the removal of the furnace possible with-
out appreciably shifting it from its horizontal position or rotating it. about, its
longitudinal axis.
In the accompanying drawings
i
7
Figure 1 is a vertical transverse section showing one construction of furnace
according to this invention and its position relatively to the combustion chamber
and the boiler shell.
Figure 2 is a plan of the furnace.
Figure 3 is a part longitudinal section of the furnace and combustion chamber.
Figure 4 is a transverse section of the furnace drawn to a larger scale, and.
Figure 5 is a plan to the same scale as Figure 4 of the back end of the furnace
just about to pass through the opening in the front plate of the boiler, which latter
is indicated in section.
Like letters indicate like parts throughout the drawings.
With reference first to Figures 1, 2 and 3, A. is a furnace which is, by way of
example, of the corrugated type. A neck is formed at the back end of the furnace
as at A so that the back opening with its flanges A2 and A³ is eccentric with
the main body of the furnace.
Figure 1 shows the furnace A in position relatively to the boiler shell B and
combustion-chamber tube-plate C. The furnace A is placed so that its eccentric
back end is as far to the right as possible, that is away from the vertical centre
line B of the boiler. It will of course be understood that in the case of a left
hand wing furnace, the eccentricity of the back opening would be in the opposite
direction, that is, to the left hand. The advantage of this arrangement may be
seen by an inspection of Figure 1; without departing from the normal design

page_text: of the boiler or combustion chamber the products of combustion pass from the
furnace centrally with regard to the tubes C₁ of the combustion chamber and
hence, as indicated by the arrows in Figure 1, are distributed evenly amongst
them.
Figure 4 is a transverse section of the furnace drawn to a larger scale than that
of Figures 1, 2 and 3. It will be noticed that the upper flange A2 is so shaped
and disposed with regard to the body of the furnace that its point of juncture
with the lower flange A³ on the side adjacent to the vertical centre line of the
boiler is on or near the horizontal centre line of the furnace body and is within
the radius of such body. This construction, as will be seen from Figure 5, allows
the furnace to be readily removed from the boiler front without tilting it from
the horizontal or rotating it about its longitudinal axis. If the greatest dis-
tance across the flange A2 is less than the diameter of the opening in the boiler
front or in the flanged plate E attached thereto the furnace can of course be
withdrawn straight through that opening, but if not, by slewing the furnace
horizontally, as indicated by chain lines in Figure 5, its removal can be readily
accomplished. In the case of welded furnaces, the weld being usually at that
part of the furnace nearest the bottom of the boiler, the flange A2 is formed upon
the side of the furnace opposite to the weld.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that I
am aware that furnaces have heretofore been given special shapes to facilitate
their removal from the boiler and to the broad idea of shaping furnaces for such
a purpose I make no claim, but what I claim is:-
1. The combination with a boiler and a combustion chamber of a wing
furnace so placed that its back end is horizontally eccentric to its body substan-
tially as and for the
described.
purpose
с
2. The combination with a boiler and a combustion chamber of a wing furnace
having its back end horizontally eccentric to its body and flanged substantially as
described so as to be readily removable through the boiler front without being
tilted out of the horizontal.
3. A wing furnace having its back end horizontally eccentric to its body and
flanges shaped and disposed substantially as described in relation to that body.
4. The complete furnace substantially as described or illustrated in the accom-
panying drawings.
1000
JOHN IRELAND BOOKER.
Boult, Wade & Kilburn,
Agents for the Applicant.