Improvements in Tubular Boilers.
Year: 1892

page_text: Date of Application, 30th Dec., 1892
Complete Specification Left, 22nd Sept., 1893—Accepted, 28th Oct., 1893
PROVISIONAL
SPECIFICATION.
Improvements in Tubular Boilers.
A communication by VICTOR CONSTANT JOSEPH LAURENT and EUGÈNE
SCHERDING, both of 15, Rue du Louvre, Paris, in the Republic of France,
Engineer and Merchant respectively.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool and 6 Bank Street,
Manchester both in the County of Lancaster and 323 High Holborn in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in tubular boilers, and more particularly
to that class of boiler in which the flame traverses the boiler twice.
It has for its object to increase the evaporating power of such class of boilers, to
cause the hot gases to be distributed in a rational manner in the two superimposed
groups of boiler tubes, and, finally, to protect certain portions of the tubular boilers
from the direct action of the hot gases.
The invention also relates to the manner of applying these improvements to the
various kinds of boilers more generally in use.
The cylindrical body of the boiler is provided with two groups of tubes placed
one above the other, the lower group connects the furnace with a smoke box
common to all, situated at the rear of the boiler, and the upper group of tubes
connects this smoke box with a compartment below the furnace and communicating
with the chimney. The double cased furnace of the boiler has at its upper part a
group of transverse tubes, which may be arranged horizontally, or preferably in a
slightly inclined position, so as to facilitate the circulation of the liquid, and the
passage of the steam which is produced in large quantities in these tubes.
Cleaning plugs are arranged in the external casing of the furnace, in front of
each tube or group of tubes, or these tubes may be arranged between two sheet
metal plates fixed in the interior of the furnace by means of bolts so that they may
be easily taken down when necessary.
A horizontal partition or platform, formed of fire clay plates, is arranged on this
group of transverse tubes, so that there will be formed at the upper part of the
furnace a separate compartment communicating directly with the chimney: this
platform has a hinged or sliding valve which allows the hot gases to escape direct
into the chimney when such is necessary.
In order to insure a rational distribution of the hot gases in the two superposed
groups of tubes in the boiler, a double partition is fixed in the common smoke box
situated at the rear of this boiler, and is arranged in such a way that the gases
passing through the upper rows of the lower group of tubes, corresponding to their
first passage through the boiler, emerge into a kind of hood which directs them
nto the lower tubes of the upper group in their second passage. In the same way,
the gases passing through the lower rows of the lower group of tubes of the boiler
are conveyed by a larger hood enclosing the former one, into the upper tubes of
the upper group in their second passage.
Hinged valves arranged in the lower part of these two hoods allow the sparks
carried along by the gaseous current to fall, when it is so desired, into the
ower part of the smoke box, from whence they may be removed by means of a
ide door.
In order to protect certain parts of the boiler from direct contact with the
lames or the hot gases, a perforated fire clay partition is placed in front of the

page_text: tube plate of the furnace, and has for its object to shield the junction rings of
the tubes from the direct radiation of the ignited combustibles.
For the same reason, the external hood, arranged in the smoke box, is preferably
made of fire clay, the walls of which are thus protected from contact with the still
very hot gases on their exit from their first passage through the lower group of
boiler tubes.
Finally, when these improvements are employed for a boiler of large diameter
and having two furnaces, such boiler is preferably suitably braced or stayed by a
vertical partition, in order to insure the necessary rigidity, which thus allows of
two independent boilers being obtained in case an accident of any kind should
interrupt the working of one of them.
Dated this 29th day of December 1892.
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Tubular Boilers.
A communication by VICTOR CONSTANT JOSEPH LAURENT and EUGÈNE
SCHERDING, both of 15, Rue du Louvre, Paris, in the Republic of France,
Engineer and Merchant respectively.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E.,. of the Agency fo
Foreign Patent Solicitors, 6 Lord Street, Liverpool and 6, Bank Street,
Manchester, both in the County of Lancaster and 323 High Holborn in the
County of Middlesex, Civil 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 :-
A boiler of
This invention relates to improvements in tubular boilers, and more particularly
to that class of boiler in which the flame traverses the boiler twice.
this kind is shown in the Patent No. 9326 of May 17, 1892.
It has for its object to increase the evaporating power of such class of boilers, to
cause the hot gases to be distributed in a rational manner in the two superimposed
groups of boiler tubes, and, finally, to protect certain portions of the tubular boilers
from the direct action of the hot gases.
The invention also relates to the manner of applying these improvements to the
various kinds of boilers more generally in use.
These improvements will now be described with reference to the accompanying
drawings, on which,
Figures 1 and 2 represent longitudinal and transverse sections respectively of a
tubular boiler of the locomotive pattern, provided with these improvements.
Figures 3 and 4 are longitudinal and transverse sections respectively of an
industrial or marine boiler.
Figure 5 is a section showing the application of the system to a very powerful
boiler having two furnaces.
The same reference letters indicate the same parts of the boilers on the different
figures.
The cylindrical body of the boiler M is provided with two groups of tubes
placed one above the other, the lower group T connects the furnace A with a
smoke box F common to all, situated at the rear of the boiler, and the upper group
of tubes t connects this smoke box with a compartment above the furnace and
communicating with the chimney E. In consequence of this arrangement, the
boilers which are of equal power are much shorter than those at present employed,
whence it results that the destructive effects on the tube plates due to the expansion
of the tubes are. considerably reduced, this is a very great advantage on which
particular stress must be laid. The double cased furnace A of the boiler M has at
its upper part, as may be seen on the drawings, a group of transverse tubes, B. which

page_text: may be arranged horizontally, or preferably in a slightly inclined position, so as to
facilitate the circulation of the liquid, and the passage of the steam which is
produced in large quantities in these tubes.
Cleaning plugs K, Figures 4 and 5, are arranged in the external casing of the
furnace, in front of each tube or group of tubes. or these tubes may be arranged between
two sheet metal plates fixed in the interior of the furnace by means of bolts so that
they may be easily taken down when necessary.
A horizontal partition or platform C, formed of fire clay plates, is arranged on
of
this group of transverse tubes, so that there will be formed at the upper part
the furnace a separate compartment communicating directly with the chimney ;
this platform has a hinged or sliding valve D which allows the hot gases to escape
direct into the chimney E when such is necessary.
When the valve D is mounted on a metal axis, as shown in Figures 1 and 2, this
axis is preferably made of hollow iron and cooled by a stream of water.
In Figures 3, 4 and 5, this valve is shown formed of a fire clay plate D supported
by lateral slides, and which may be easily shifted by means of bars projecting to
the outside of the boiler.
In order to ensure a rational distribution of the hot gases in the two superposed
groups of tubes in the boiler, a double partition is fixed in the common smoke
box F situated at the rear of this boiler, and is arranged in such a way that, as may
be more particularly seen in Figures 1 and 3, the gases passing through the upper
rows T of the lower group of tubes, corresponding to their first passage through
the boiler, emerge into a kind of hood G which directs them into the lower tubes t
of the upper group in their second passage. In the same way, the gases passing
through the lower rows T' of the lower group of tubes of the boiler are conveyed
by a larger hood H enclosing the former one, into the upper tubes t' of the upper
group in their second passage.
Hinged valves g h, arranged in the lower part of these two hoods, allow the
sparks carried along by the gaseous current to fall, when it is so desired, into
the lower part I of the smoke box, from whence they may be removed by means
of a side door.
In order to protect certain parts of the boiler from direct contact with the flames
or the hot gases, a perforated fire clay partition J is placed in front of the tube
plate of the furnace, and has for its object to shield the junction rings of the
tubes T T from the direct radiation of the ignited combustibles.
For the same reason, the external hood H, arranged in the smoke box, is
preferably made of fire clay, the walls of which are thus protected from contact
with the still very hot gases on their exit from their first passage through the lower
group T of boiler tubes.
Finally, when these improvements are employed for a boiler of large diameter
and having two furnaces A, such boiler is preferably arranged in the manner
shown in Figure 5 of the accompanying drawings; in this case, the external
casing M has an oval form, and the casings L of the two furnaces have the extended
form shown in this figure, all these parts of the apparatus being strong and connected
and stayed by means of trusses and tie bars with the object of imparting to them
the necessary rigidity.
As may easily be seen, this arrangement allows of the number of tubes being
increased to a large extent, and the space occupied by the boiler being diminished,
without diminishing the power, which is of very great importance for marine
boilers; further, the use of this system of the return of the flame with a rational
distribution of the hot gases in the two groups of tubes T arranged one above
the other enables the length of the boiler to be considerably reduced, which also
facilitates its installation on board ships.
It must be understood that this invention is not limited exactly to the various
forms and arrangements of boilers shown on the accompanying drawings, but that
these improvements may be applied with equal advantage to all kinds of tubular
boilers at present employed industrially.

page_text: Having now particularly described and ascertained the nature of the said inven
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is :-
1. In a tubular boiler, the division of the furnace into two compartments by
means of a fire clay partition, such as C, resting on a group of transverse tubes B;
the lower compartment constituting the furnace and the upper compartment being
in direct communication with the chimney; a valve D enabling the two compart-
ments hereinbefore described to be placed in communication; substantially as
herein before described.
2. In a tubular boiler having a furnace divided into two compartments by means
of a fire clay plate, or by a horizontal boiler-tube in such a way that the lower
group of tubes T opens into the lower compartment which forms the furnace, and
that the upper group of the tubes communicates with the upper compartment
opening into the chimney: the arrangement in the smoke box of a double hood G H
arranged in such a way that the upper tubes of the lower group T are placed in
communication with the lower tubes of the upper group t, and that the lower
tubes of the lower group T are placed in communication with the upper tubes of
the upper group: substantially as herein before described.
3. In a tubular boiler, the arrangement, in front of the tube plate of the
furnace, of a fire clay plate perforated with holes, such as J, with the object of
protecting the before named tube plates against the direct action of the flame of
the furnace; substantially as hereinbefore described.
4. In a tubular boiler which is twice traversed by the flame; the addition, in the
smoke box, of a partition or hood such as H made of fire clay, in order to
protect the metal walls of the above named smoke box against the direct action of
the hot gases issuing from the lower group of boiler tubes; substantially as herein-
before described.
5. In a marine tubular boiler with two furnaces and in combination with the
arrangements hereinbefore described for insuring a double passage of the flame :
the use of an oval external casing M and of internal casings L for the furnaces
of elongated form substantially as hereinbefore described and shown on Figure 5
of the accompanying drawings; the whole in the manner and for the object herein-
before indicated.
Dated this 21st day of Sentumber 1802