Improved Water-tube Boiler.
Year: 1897

page_text: Date of Application, 9th Oct., 1897
Complete Specification Left, 14th June, 1898-Accepted, 8th Oct., 1898
PROVISIONAL SPECIFICATION.
Improved Water-tube Boiler.
I, JULIUS GUSTAV SCHMIDT, of 32, Konigstrasse, Erkner, near Berlin, in the
German Empire, Manufacturer, do hereby declare the nature of this invention
to be as follows:-
The present invention relates to a water tube boiler, the tube system of which
consists of two groups of tubes, of which the one is composed of single tubes
standing vertically close to one another and which can be connected in various
ways with the second group of tubes which consists of single tubes placed hori-
zontally, so that quite different methods of working the boiler can be hereby
attained according to the special purposes in view.
Referring to the accompanying drawing which illustrates one modification of .
this boiler,
Figure 1 is a front view of the boiler.
Figure 2 is a side view.
Figure 3 is a view from behind.
Figure 4 is a section on the line 1-1 of Figure 2.
Figure 5 is a section on the line 11-11 of Figure 2.
The entrance of the water into the boiler is effected through the projection A
(Figures 2 and 3) on the tube B. From this point the water falls downwards
and fills the tubes C arranged symmetrically on both sides of the boiler and con-
nected to the tube B. To each of the said tubes C there connects along the
whole length directly a series of tube heads D. Into each of these tube heads
are inserted several water tubes E (in the drawing three tubes are shewn) which
tubes are brazed or in any other suitable manner firmly connected therewith.
The water will consequently distribute itself symmetrically throughout the two
vertical tube groups E and must rise up in these tubes under the influence of the
heating by the combustion gases.
At the upper tube ends are placed similar tube heads F and firmly connected.
thereto and arranged in a series close to one another in the like manner as in
the case of the tube heads D. Moreover, the tube heads F connect immediately
to a common collecting pipe G so that the mixture of water and steam dis
charges into this pipe G in order to pass from it through the connection H.
into the common steam collector J. Moreover, the feed water passes at the same
time into the collecting tube L which is also attached to B and is here in conse-
quence of the heating driven upwards and must therefore pass through the four
connecting tubes K into the steam collector J. Whilst the evolved steam hére
becomes free from the water and collects above, the water sinks through the
tube B downwards, mixes there with the freshly supplied feed water, passes
through the connections already described, again into the heated tubes E, and
proceeds on its circuit over again.
The above described tubular system consequently constitutes a circulating
water tube boiler. In order to render this arrangement specially applicable for
different methods of working the two horizontally placed groups of tubes MM

page_text: are added which are connected with it according as the work may require. By
way of explanation in what manner the circulating water tube system may be
caused through altered connections with the tube groups M M to produce other
methods of operating the boiler suited for various requirements, the following
description will shew:-
EXAMPLE 1.
The boiler is intended for motor purposes to work at a very high pressure
and with multiple expansion. In this case the steam. liberated at Jis mixed
with atmospherical air, being caused to pass through an injector specially designed
for this purpose upon its course from J to the first tube. head of the group M.
The said injector is supplied with compressed air from a compressing apparatus
of any kind, and the steam must draw in this air and carry it with it and then
pass consecutively as a mixture of steam and air through all the tubes of the
group M M, which are connected by means of the connecting pieces P, and the
circulation tube Q in serpentine fashion, and must in this manner become
through the action of the fire superheated to dryness and finally escape at N in
order to serve for the driving of the motor. This method of operating the boiler
is especially designed to obtain a very high percentage of efficiency upon the heat
units contained in the fuel consumed and this even with the simplest expansion.
mechanism. It will be obvious that the steam could also be dried and super-
heated in exactly the same manner in the group of tubes M M without the addi-
tion of air. In this case the injector and compressor would not be required.
EXAMPLE 2.
The boiler is intended to supply saturated steam corresponding to a given
pressure without superheating. In this case and in opposition to the process
employed in the first example the feed water is first passed through the
tubes M M in such manner for instance that the said water enters at the same
time in both lowest sets of tubes and there it rises equally on both sides in the tubes
connected in serpentine manner together by means of the connecting pieces P,
and thus arrives in the tube Q which in this case is placed above and passes on
through a connecting piece. attached to Q into the discharge pipe B where it
takes part in the circulation already described, and is completely evaporated.
The steam which may have developed already in the group of tubes M M can pass
directly into the collector J through the other connecting pieces attached to Q.
In this method of constructing the boiler the collecting tube J can be constructed
as much larger as may be requisite to fulfil the special requirements.
EXAMPLE 3.
The boiler is intended to be applied to both the methods of working set forth
in Examples 1 and 2. In this case the steam liberated in J is treated in the
manner described under Example 1 and conducted to the motor through one of
the groups of tubes M; whilst the feed water is passed through the other group
of tubes M in the manner described in Example 2. The connecting tube Qis
not required, because the connections are made direct to each group of tubes.
The above described boiler is therefore reversible according to the special destina-
tion of the steam to be raised in it, in as much as the one group of tubes may serve
either as a superheater or as a preliminary heater. By correspondingly arranged
connections the same boiler can therefore be applied to the different purposes
with especial advantages.
With regard, to the illustrations of the horizontally placed boiler system MM
it should be stated that in Figure 1 the same tube heads are illustrated whereas
in Figure 3 the connecting pieces P are represented as placed upon the several
tube heads. The feet R of the boiler are hollow and are in immediate connection
with the circulation space of the water so that the said feet serve as mud col-

page_text: lectors, and the contents of the boiler can be blown out through them by means
of the connecting pieces S. The fire space is so arranged in the middle of the
boiler system (shewn in the drawing) that the water tubes in respect to the same
lie symmetrically at both sides thereof, and that in consequence of the special
arrangement of the tubes the fire gases can rise equally on both sides, and thus
heat all the tubes almost equally thereby securing a very high efficiency. The
fire gases may be taken away in this boiler system either from above or sideways
or even sideways and downwards according as the cover is arranged, also several
boilers may be combined together with a single cover especially when economy
of space is of consideration, as for instance in ships.
Dated this 9th day of October 1897.
I, JULIUS GUSTAV SCHMIDT, of 32, Konigstrasse, Erkner, near Berlin, in the
German Empire, Manufacturer, 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 present invention relates to a water tube boiler, the tube system of which
consists of two groups of tubes, of which the one is composed of single tubes
standing vertically close to one another and which can be connected in various
ways with the second group of tubes which consists of single tubes placed hori-
zontally, so that quite different methods of working the boiler can be hereby
attained according to the special purposes in view.
Referring to the accompanying drawing which illustrates one modification of
this boiler.
Figure 1 is a front view of the boiler, partly sectional.
Figure 2 is a side view.
Figure 3 is a view from behind.
Figure 4 is a section on the line 1-1 of Figure 2.
Figure 5 is a section on the line 11-11 of Figure 2.
The entrance of the water into the boiler is effected through the projection A
(Figures 2 and 3) on the tube B. From this point the water falls downwards
and fills the tubes Carranged symmetrically on both sides of the boiler and con-
nected to the tube B. To each of the said tubes C there connects along the
whole length directly a series of tube heads D. Into each of these tube heads
are inserted several water tubes E (in the drawing three tubes are shewn) which
tubes are brazed or in any other suitable manner firmly connected therewith.
The water will consequently distribute itself symmetrically throughout the two
vertical tube groups E and must rise up in these tubes under the influence of the
heating by the combustion gases.
At the upper tube ends are placed similar tube heads F and firmly connected
thereto and arranged in a series close to one another in the like manner as in
the case of the tube heads D. Moreover, the tube heads F connect immediately
to a common collecting pipe G so that the mixture of water and steam dis-
charges into this pipe G in order to pass from it through the connection H
into the common steam collector J. Moreover, the feed water passes at the same
time from A into B and thence to C and passes eventually into
the collecting tube L which is also attached to B and is here in conse-

page_text: quence of the heating driven upwards and must therefore pass through the four
connecting tubes K into the steam collector J. Whilst the evolved steam here
becomes free from the water and collects above, the water sinks through the
tube B downwards, mixes there with the freshly supplied feed water entering
at A passes through the connections already described, again into the heated
tubes E, and proceeds on its circuit over again.
The above described tubular system consequently constitutes a circulating
water tube boiler. In order to render this arrangement specially applicable for
different methods of working the two horizontally placed groups of tubes M_M
are added which are connected with it according as the work may require. By
way of explanation in what manner the circulating water tube system may be
caused through altered connections with the tube groups MM to produce other
methods of operating the boiler suited for various requirements, the following
description will shew:-
EXAMPLE 1.
The boiler is intended for motor purposes to work at a very high pressure
and with multiple expansion. In this case the steam liberated at J is mixed
with atmospheric air, being caused to pass through an injector specially designed
for this purpose upon its course from J to the first tube head of the group M.
The said injector is supplied with compressed air from a compressing apparatus
of any kind, and the steam must draw in this air and carry it with it and then
pass consecutively as a mixture of steam and air through all the tubes of the
group M M, which are connected by means of the connecting pieces P, and the
circulation tube Q in serpentine fashion, and must in this manner become
through the action of the fire superheated to dryness and finally escape at N in
order to serve for the driving of the motor. This method of operating the boiler
is especially designed to obtain a very high percentage of efficiency upon the heat
units contained in the fuel consumed and this even with the simplest expansion
mechanism. It will be obvious that the steam could also be dried and super-
heated in exactly the same manner in the group of tubes M M without the addi
tion of air. In this case the injector and compressor would not be required.
EXAMPLE 2.
the
The boiler is intended to supply saturated steam corresponding to a given
pressure without superheating. In this case and in opposition to the process
employed in the first example the feed water is first passed through
tubes MM in such manner for instance that the said water enters at the same
time in both lowest sets of tubes and there it rises equally on both sides in the tubes
connected in serpentine manner together by means of the connecting pieces P,
and thus arrives in the tube Q which in this case is placed above and passes on
through a connecting piece attached to Q into the discharge pipe B where it
takes part in the circulation already described, and is completely evaporated.
The steam which may have developed already in the group of tubes M M can pass
directly into the collector J through the other connecting pieces attached to Q.
In this method of constructing the boiler the collecting tube J can be constructed
as much larger as may be requisite to fulfil the special requirements.
EXAMPLE 3.
The boiler is intended to be applied to both the methods of working set forth
in Examples 1 and 2. In this case the steam liberated in J is treated in the
manner described under Example 1 and conducted to the motor through one of
the groups of tubes M; whilst the feed water is passed through the other group
of tubes M in the manner described in Example 2. The connecting tube Q is
not required, because the connections are made direct to each group of tubes.
The above described boiler is therefore reversible according to the special destina-

page_text: tion of the steam to be raised in it, in as much as the one group of tubes may serve
either as a superheater or as a preliminary heater. By correspondingly arranged
connections the same boiler can therefore be applied to the different purposes
with especial advantages.
With regard to the illustrations of the horizontally placed boiler system MM
it should be stated that in Figure 1 the tube heads themselves are shewn, whereas
in Figure 3 the connecting pieces l'are represented as placed upon the several
tube heads. The feet R of the boiler are hollow and are in immediate connection
with the circulation space of the water so that the said feet serve as mud
collectors, and the contents of the boiler can be blown out through them by means
of the connecting pieces S. The fire space is so arranged in the middle of the
boiler system (shewn in the drawing) that the water tubes in respect to the same
lie symmetrically at both sides thereof, and that in consequence of the special
arrangement of the tubes the fire gases can rise equally on both sides, and thus
heat all the tubes almost equally thereby securing a very high efficiency. The
fire gases may be taken away in this boiler system either from above or sideways
or even sideways and downwards according as the cover is arranged, also several
boilers may be combined together with a single cover especially when economy
of space is of consideration, as for instance in ships.
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 water tube boiler with multiple circulation consisting essentially of two
systems of tubes independent one of another of which the one (E) serves for the
production of steam proper whilst the other (MM) is reversible with relation to
its functions that it may either serve as the superheater or as the water heater.
2. A water tube boiler such as set forth in Claim 1 characterized by the
arrangement that the rise of the water in the steam forming tubes occurs verti-
cally and at the same time as in the other horizontal tubular system, the steam
or the water is conducted through serpentine "coils.
3. A water tube boiler such as set forth in Claim 1 characterized by the
arrangement that in it simultaneously steam can be raised, mixed with air, and
superheated.
4. A water tube boiler such as set forth in Claim 1 characterized by the
arrangement that the fire space is arranged in the midst of the boiler so that
both tubular systems are placed symmetrically on both sides thereof in relation
to the said fire space.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.