Improvements in and connected with Boilers for Locomotives or similar Tube-boilers.
Year: 1899

page_text: Date of Application, 11th Nov., 1899
Complete Specification Left, 10th Aug., 1900-Accepted, 10th Nov., 1800
PROVISIONAL SPECIFICATION.
Improvements in and connected with Boilers for Locomotives or
similar Tube-boilers.
We, WILHELM SониIDт, of Wilhelmshöhe, near Cassel, in the Province of
Hesse-Nassau, Germany, Civil Engineer, and HERMANN ELSNER, of 79, Kaiser
Strasse, of Cassel, in the Province of Hesse-Nassau, Germany, Engineer, do
hereby declare the nature of this invention to be as follows :-
Hitherto it has been difficult and troublesome to arrange superheaters in
boilers for locomotives or similar boilers because it was difficult to obtain a
regular draught and a sufficient heating surface owing to the small space, which
is available for the arrangement of superheaters in such boilers.
The object of the present invention is to obviate the inconveniences found with
superheaters hitherto employed for boilers of the above class. The character-
istic feature of our superheater (which is arranged within the smoke box and
which consists of tubes within tubes) is that the fire gases after passing through
the boiler tubes simultaneously pass through and around the superheating pipes
without the direction of draught being reversed, whereby. a division of the fire
gases takes place. The one part of the fire gases is used for the inner heating,
whilst the other part passes around the superheating pipes. For this purpose the
superheating pipes are arranged in front of only a portion of the boiler tubes
and the fire gases coming from this part of the boiler tubes pass through the
inner superheating pipes, and the fire gases coming from the remaining part of
the boiler tubes, directly after leaving these lattor, pass over and around the
outer surface of the superheating pipes thereby heating them from the outside.
With these arrangements several essential advantages, especially for loco-
motives, can be attained. The superheating pipes being arranged in front of the
tubes of the boiler so that the boiler tubes and corresponding superheating
pipes are in alignment, it is evident that the boiler tubes as well as the super-
heating pipes can easily be cleaned.
With our arrangement and this is of especial importance the ashes are easily
separated from the gases by reason of the resistance offered by the superheating
ipes. When the ashes as they issue from the boiler tubes strike the ends of
the superheating pipes they drop down on to the bottom of the smoke box.
It is of minor importance to arrange the superheater in the upper part of the .
moke chamber.
Dated this 11th day of November 1899.

page_text: "
Improvements in and connected with Bollers for Locomotives or
similar Tube-boilers.
We, WILHELM SCHMIDT, of Wilhelmshöhe, near Cassel, in the Province of
Hesse-Nassau, Germany, Civil Engineer, and HERMANN ELSNER, of 79, Kaiser
Strasse, of Cassel, in the Province of Hesse-Nassau, Germany, 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 follow-
ing statement:-.
Hitherto it has been difficult and troublesome to arrange superheaters in
boilers for locomotives or similar boilers because it was difficult to obtain a
regular draught and a sufficient heating surface owing to the small space, which
is available for the arrangement of superheaters in such boilers.
The object of the present invention is to obviate the inconveniences found
with superheaters hitherto employed for boilers of the above class. The character-
istic feature of our superheater (which is arranged within the smoke-box and
which consists of tubes within tubes) is that the fire gases after passing through
the boiler tubes simultaneously pass through and around the superhealing pipes
without the direction of draught being reversed, whereby a division of the fire
gases takes place. The one part of the fire gases is used for the inner heating,
whilst the other part passes around the superheating pipes. For this purpose
the superheating pipes are arranged in front of only a portion of the boiler
tubes and the fire gases coming from this part of the boiler tubes pass through
the inner superheating pipes, and the fire gases coming from the remaining
part of the boiler tubes directly after leaving these latter pass over and around
the outer surface of the superheating pipes, thereby heating them from the
outside.
With these arrangements several essential advantages, especially for loco-
motives, can be attained. The superheating pipes being arranged in front of
the tubes of the boiler so that the boiler tubes and corresponding superheating
pipes are in alignment, it is evident that the boiler tubes as well as the super-
heating pipes can easily be cleaned.
With our arrangement, and this is of especial importance, the ashes are
easily separated from the gases by reason of the resistance offered by the super-
beating pipes. When the ashes as they issue from the boiler tubes strike the
superheating pipes they drop down on to the bottom of the smoke box.
It is of minor importance to arrange the superheater in the upper part of
the smoke chamber.
Our invention will be the better understood with reference to the accompany-
ing drawing, in which we have illustrated our improvement used with a loco-
motive and with a marine boiler and in which :-
Figure 1 illustrates a vertical transverse section through a locomotive show-
ing the superheating pipes and its connections.
Figure 2 illustrates vertical longitudinal section through a locomotive show-
ing the superheating arrangement, the boiler tubes and its connections.
Figure 3 illustrates a detail view of the superheating pipes to an enlarged
scale.
:
The superheater is composed of pipes surrounded by pipes b, both being
arranged in series and abutting in known manner into steam boxes cc. Be-
tween the various pipes are formed annular hollow spaces allowing of the
passage of the steam coming from the steam-box and leading into the steam

page_text: box c, from there being conducted into the cylinder. Intermediate spaces d
between the various double pipes ab allow of the passage of the fire-gases.
These two steam boxes with the series of pipes ab connecting both boxes
to each other (see Figure 2) are arranged within the smoke chamber of the
locomotive.
As clearly to be seen from the drawing, the superheating pipes ab are arranged
directly in front of and connected with a portion of the boiler-tubes r, whilst
the other part of the boiler tubes, in the drawing illustrated as the lower part,
remains free. The fire gases coming from this part of the boiler tubes pass
directly into the smoke chamber k. The inner tubes a of the superheater, as
illustrated in Figure 3, form the direct continuation of the boiler tubes, as can be
seen from Figure 2. Hereby an easy cleansing of the boiler tubes as well as
of the superheating pipes a at any moment is rendered possible.
Evidently it is not necessary that the steam box c be arranged in front of the
tubes r, but for the above named purposes it is advantageous to make use of this
position in which the superheating pipes and the boiler tubes are arranged in
the same axial direction.
The fire gases coming from the upper part of the tubes pass through the
inner superheating pipes a and effect the heating of the same whilst the gases
coming from the lower part of the boiler tubes after having entered the smoke
chamber k, pass through the intermediate spaces d and heating the tubes b of the
superheater escape through the chimney.
We further beg to point out that the illustrated arrangement. in which
the superheater is connected to the upper part of the boiler tubes is the more
advantageous, since within the smoke chamber a suitable space is left for the
ashes, but we do not restrict ourselves to this construction.
The ashes coming from the lower part of the boiler tubes are easily separated
from the gases by reason of the resistance offered by the tubes b and also the ashes
of the gases passing through the inner pipes a drop down on to the bottom of the
smoke-chamber before they have reached the chimney.
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:-
A superheater for locomotive, locomobile and other tube-boilers, consisting of
tubes within tubes, said superheater being arranged within the smoke-chamber
and connected to one part of the boiler tubes, so that the smoke-gases are com-
pelled to pass the internal tubes of said superheater, whilst the gases passing
from the other part of the boiler tubes cironlate round the external tubes of
the superheater, substantially as and for the purposes set forth.
Dated this Tenth day of duoust 1000