Improvements in and connected with Superheating Arrangements with Separate Firings.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in and connected with Superheating Arrangements
with Separate Firings.
I, WILHELM SCHMIDT, of Wilhelmshöhe,, near Cassel, in the Province of Hesse-
Nassau, German Empire, Civil Engineer, do hereby declare the nature of this
invention to be as follows;-
Hitherto many industrial experiments have been made to improve superheating
arrangements having special firings and to protect these superheaters against
glowing and burning. In most of these experiments the superheater either
formed a part of the boiler and was fired by the same or it was arranged sepa-
rately, having a special separate firing, the burning and the glowing of the pipes
being prevented by intercalation of Chamotte walls.
Proportionally large quantities of heat are necessary to render a superheater
effective, and in practice the first manner of building superheaters only has shown
favorable results with certain installations, but with ordinary boilers, as for
instance marine boilers, for which only small space is available, they have not
proved successful. The second manner, viz. intercalation of Chamotte side-walls,
is impracticable with superheaters having special firings for the reason that they
do not prevent the glowing and rapid destruction of the superheating pipes, owing
to the radiated heat influencing the superheating pipes.
For marine boilers the employment of Chamotte side-walls is impracticable
owing to their heavy weight and fragility. The question of employing highly
superheated steam in marine boilers becoming more and more important, it is
essential to build superheating arrangements in which the glowing and burning
of the superheating pipes during the inactivity of the machine is prevented and
by means of which nevertheless a thorough superheating of large quantities of
steam is effected.
To attain this end I propose to adopt a way hitherto not employed in practice,
viz. I do not combine, as hitherto, a boiler having its own firing with a separate
superheating arrangement, but I consider the superheater as chief element and
connect it in suitable manner with an auxiliary boiler having the only reason
to destroy the dangerous influences resulting from the separate firing of the super-
heater.
In my improved superheating arrangement I employ a firing being wholly
independent of the firing of the principal boiler. I conduct the steam of the
principal boiler into the superheater protected by the pipes of an auxiliary boiler
of suitable construction, thereby the glowing and burning of the superheater
pipes being, prevented and nevertheless a large quantity of heat being employed
for superheating the steam within the superheating arrangement.
The essential point of my invention is the independance of the superheating

page_text: arrangement and of the principal boiler, and the possibility to employ the steam
of the auxiliary boiler in conjunction with the steam of the principal boiler.
Improvements in and connected with Superheating Arrangements
with Separate Firings.
I, WILHELM SCHMIDT, of Wilhelmshöhe, near Cassel, in the Province of Hesse-
Nassau, German Empire, 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:―
Hitherto many industrial éxperiments have been made to improve superheating
arrangements having special firings and to protect these superheaters against
glowing and burning. In most of these experiments the superheater either
formed a part of the boiler and was fired by the same or it was arranged sepa-
rately, having a special separate firing, the burning and the glowing of the pipes
being prevented by intercalation of Chamotte walls.
Proportionally large quantities of heat are necessary to render a superheater
effective, and in practice the first manner of building superheaters only has shown
favorable results with certain installations, but with ordinary boilers, as for
instance steam-vessel-boilers, for which only small space is available, they have not
proved successful. The second manner, viz. intercalation of Chamotte side-walls,
is impracticable with superheaters having special firings for the reason that they
do not prevent the glowing and rapid destruction of the superheating pipes, owing
to the radiated heat influencing the superheating pipes.
For steam-vessel-boilers the employment of Chamotte side walls is impracticable
owing to their heavy weight and fragility. The question of employing highly
superheated steam in such boilers becoming more and more important, it is
essential to build superheating arrangements in which the glowing and burning
of the superheating pipes during the inactivity of the machine is prevented and
by means of which nevertheless a thorough superheating of large quantities of
steam is effected.
To attain this end I propose to adopt a way hitherto not employed in practice,
viz. I do not combine, as hitherto, a boiler having its own firing with a separate
superheating arrangement, but I consider the superheater as chief element and
connect it in suitable manner with an auxiliary boiler having the only function
to destroy the dangerous influences resulting from the separate firing of the super-
heater.
In my improved superheating arrangement I employ a firing being wholly
independent of the firing of the principal boiler. I conduct the steam of the
principal boiler into the superheater protected by the pipes of an auxiliary boiler
of suitable construction, thereby the glowing and burning of the superheater
pipes being prevented and nevertheless a large quantity of heat being employed
for superheating the steam within the superheating arrangement.
The essential point of my invention is the independence of the superheating
arrangement and of the principal boiler, and the possibility to employ the steam
of the auxiliary boiler in conjunction with the steam of the principal boiler.
In order to make my invention more clear, I refer to the accompanying drawing,

page_text: in which I beg to give an example where the auxiliary boiler properly is arranged
in the superheater, thereby all possible losses of heat are prevented and the fire-
gases are allowed to pass over the whole surface of the superheating-pipes, a good
protection for the same being created by the water pipes of the auxiliary boiler.
Figure 1 represents a vertical section through my arrangement, and
Figure 2 illustrates an elevational view, partly being in section.
In the drawing a represents the firing. On both sides, somewhat higher than
the firing itself, the water drums b of the auxiliary boiler are arranged and s illus-
trates the steam drum of the same, which might be raised or lowered at con-
venience. Both are connected by pipes & curved at the lower part. r illustrates
the superheating pipes, the feet of which are covered with gravel and separated
from the pipes c by means of Chamotte-walls d.
When now the fire-gases tend to pass around the water-tubes c, they are obliged
to contract the more they approach to the end of the curve of the tubes c owing
to the Chamotte-walls d. Arrived at the end of the curves, they have a free pas-
sage and press along the whole length of the superheating pipes r.
The admission of the steam coming from the principal boiler, is effected by the
tube o, conducting the steam to a steam-drum. From here the steam through
the pipe flows down to the drum k; from there, as clearly to be seen from the
drawing, again upwards into the steam-drum h, where a pipe 1 conducts the
highly superheated steam to the engine.
In my invention it is an essential point, that the steam flows in two different
directions, viz. through one series of superheating tubes in the same direction as
the fire gases, and through the other series of superheating tubes in the contrary
direction to the same, so that the heat of the fire gases is utilized during the
whole passage.
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 what
I claim is:
1. A superheater with separate firings, particularly for boilers of steam vessels,
said superheater being protected against the radiation heat of its firing by an
auxiliary boiler arranged within the same, said superheater receiving the main
boiler steam to be superheated, for the purpose as described.
2. A superheater with separate firings, particularly for boilers of steam vessels,
said superheater being protected against the radiation heat of its firing by an
auxiliary boiler arranged within the same, said superheater receiving the main
boiler steam to be superheated and that of the auxiliary boiler, for the purpose
as described.
3. A superheating arrangement with separate firings particularly for boilers of
steam vessels, the same enclosing on two sides the tubes of the auxiliary boiler,
so that the gases ascending from the fire-grates touch first the two series of water-
tubes of the auxiliary boiler located within the superheater and then passing
between them, circulate round the superheating tubes in the vertical direction,
for the purpose as described.
Dated this 18th day of June 1900.
JENSEN & SON,
77, Chancery Lane, London, W.C.,
Patent Agents.

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