Year: 1898

page_text: I, RICHARD SCHULZ, of 2, Flensburgerstrasse, Berlin, in the Empire of Germany,
Engineer, do hereby declare the nature of this invention to be as follows:
The present water-tube boiler belongs to that kind in which an upper boiler
is connected with a spacious or roomy under boiler by means of separate groups
of tubes.
Many well known water tube boilers do not work economically as is well known,
which is mainly to be ascribed to the fact that the consumption of the heating
material or fuel and also the yield of heat to the heating surfaces are incomplete,
whereby the hot gases are partially drawn away unconsumed through the chimney
into the atmosphere and with a high temperature causing a great development
of smoke and even in some cases flames. The present arrangement has for its
object to avoid these drawbacks.
The arrangement is such that the hot gases when they pass into the group of
tubes enter one or more successive draught chambers which within their tubular
walls are partially free from tubes and thus serve for the better consumption of
the heating gases entering therein, and are partially filled up with tubes which
serve as effective heating surfaces.. These draught chambers are separated from
the first combustion chamber over the grate by means of one or more rows of
tubes of suitable form by which partitions are formed, but which afford passage
at suitable places to the hot gases into the next draught chambers.
partition walls formed by rows of tubes are more durable as precisely in the water
tubes which form the partitions a greater amount of heat is given off and there-
fore there is a more rapid circulation of water.
These
These water-tubes forming partitions may easily be arranged in any desired
form. It is not necessary to frequently renew them as is the case with fire clay
parfitions and they have not the deleterious great weight of fire clay partitions
which in the present arrangement are entirely omitted, or only used as an auxiliary
by certain places of the draught chambers being coated with thin fire clay bricks.
Various arrangements of the draught flues may be adopted according to the
arrangement of the boiler or water-tubes. For instance in order to obtain a
horizontal conveyance to and fro of the fire gases rising from the grate out of
the combustion chamber a draught chamber may be formed to the right of the
combustion chamber by means of tubes forming a partition, and a similar draught
chamber be arranged to the left of the combustion chamber. The inner chamber
wall which is formed of the tubes extends from the rear wall bordering the chimney
almost up to the front wall but lateral passages are formed by means of small
tubes through which the fire gases take their course from the combustion chamber
into the two side chambers in order to reach the chimney. In consequence of
the narrowing of the flues for the passage of the heated gases from the combustion
chamber to the next draught chamber through the groups of tubes in the flues
the advantage is attained that the hot gases rising from the grate are forced to
linger as long a time as possible in the separate chambers before entering the

page_text: actual group of tubes and thus to become mixed more thoroughly with the oxygen
of the combustion air. The combustion is thereby rendered more complete and
the development of smoke is correspondingly less. The arrangement is thus
the means best suited for the so called smoke consumption.
In other examples there may be arranged on each side of the fire chamber two
draught chambers which are formed in a similar manner by means of tubes and
are also arranged to allow of a horizontal passage to and fro of the furnace gases
from the combustion chamber through the draught chambers to the chimney. In
the draught chambers a certain subsidiary combustion will also take place when
the heating gases admit of such with a suitable air supply.
In a similar manner, in another example the draught chambers may be formed
by means of pipes for a furnace having an up-and-down-conveyance of the furnace
gases from the combustion chamber over the grate, in order to convey the furnace
gases from the combustion chamber through the group of water tubes away to
the chimney.
Other examples may be instanced for two furnaces and for an up and down
conveyance of the furnace gases. In this case also successive chambers are
formed by tubes on the combustion chamber lying over the grate, which chambers
are traversed by the furnace gases on their course to the chimney passing between
groups of tubes.
An equal or similar utilization of the hot gases conveying, the same in an
upward and downward direction or horizontally to and fro may also be produced
in a water tube boiler with more than two furnaces.
Dated this 18th day of July 1898.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.
I, RICHARD SCHULZ, of 2, Flensburgerstrasse, Berlin, in the Empire of 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 following statement:-
-
The present water-tube boiler belongs to that kind in which an upper boiler
is connected with an under boiler by means of separate groups of tubes. Such
may be a single or double boiler with one or more furnaces.
Many well known water-tube boilers do not work economically as is well known,
which is mainly to be. ascribed to the fact that the consumption of the heating
material or fuel and also the yield of heat to the heating surfaces are incomplete,
whereby the hot gases are partially drawn away unconsumed through the chimney
into the atmosphere and with a high temperature causing a great development
of smoke and even.
.in some cases flames. The present arrangement has for its
object to avoid these drawbacks.
The arrangement is such that the hot gases when they pass into the group of
tubes. enter one or more successive draught chambers which within their tubular
walls are partially free from tubes and thus serve for the better consumption of
the heating gases entering therein, and are partially filled up with tubes which
serve as. effective heating surfaces: These draught chambers are separated from
the first combustion chamber over the grate by means of one or more rows of
tubes of suitable form by which partitions are formed, but which afford passage
at suitable places to the hot gases into the next draught chambers. These
The w

page_text: partition walls formed by rows of tubes are very durable as precisely in the water
tubes which form the partitions a great amount of heat is given off and there-
fore there is a more rapid circulation of water.
These water-tubes forming partitions may easily be arranged in any desired
form. It is not necessary to frequently renew them as is the case with fire clay
partitions and they have not the deleterious great weight of fire clay partitions
which in the present arrangement are entirely omitted, or only used as an auxiliary
by certain places of the draught chambers being coated with thin fire clay bricks.
In the accompanying drawings, Figures 3 and 4 show in vertical section eleva-
tion and sectional plan respectively a form of construction of a boiler for one
furnace having one draught chamber to the right and one chamber to the left
of the same as well as a horizontal conveyance to and fro of the furnace gases
through the groups of tubes.
Figures 1 and 2 and 5-8 respectively show also an example for one furnace
having two draught chambers to the right and two draught chambers to the left
of the same as well as a horizontal to and fro passage of the fire gases through the
groups of tubes.
Figure 9 shows a vertical section of an example for one furnace with an up
and down conveyance of the fire gases; and the remaining Figures 10-20 show
various modifications of boilers for two furnaces with an up and down conveyance
of the furnace gases.
In all the examples the upper boiler is indicated by A and the under boiler
by B, the grate by R and the chimney by S. The pipes forming the draught
chambers, that is to say the partition-forming pipes, are indicated by c and the
tubes serving for the group of tubes by d.
Various arrangements of the draught flues may be adopted according to the
arrangement of the boiler or water-tubes. For instance in the examples,
Figures 3 and 4, in order to obtain a horizontal conveyance to and fro of the fire
gases rising from the grate R out of the combustion chamber K a draught
chamber K may be formed to the right of the combustion chamber K by means
of tubes e forming a partition, and a similar draught chamber K¹ be arranged to
the left of the combustion chamber K. The inner chamber wall which is formed
of the tubes c extends from the rear wall w bordering the chimney S almost up
to the front wall w¹ but lateral passages are formed by means of small tubes d',
through which the fire gases take their course from the combustion chamber K
into the two side chambers K', as indicated by the arrows, in order to reach the
chimney S. In consequence of the narrowing of the flues for the passage of
the heated gases from the combustion chamber K to the next draught chamber
through the groups of tubes d in the flues, the advantage is attained that the
hot gases rising from the grate R are forced to linger as long a time as possible
in the separate chambers before entering the actual group of tubes and thus to
become mixed more thoroughly with the oxygen of the combustion air. The com-
bustion is thereby rendered more complete and the development of smoke is
correspondingly less. The arrangement is thus the means best suited for the
so-called smoke consumption.
C
In other examples, Figures 1 and 3 and 5-8, there may be arranged on each
side of the fire chamber K two draught chambers KK2 which are formed in a
similar manner by means of tubes and are also arranged to allow of a horizontal
passage to and fro of the furnace gases from the combustion chamber K through
the draught chambers K' K² to the chimney S as indicated by the arrows. In the
draught chamber K² a certain subsidiary combustion will also take place when
the heating gases admit of such with a suitable air supply.
In a similar manner, in another example, shown in Figure 9, the draught
chambers K1 K2 K3 may be formed by means of pipes c for a furnace having an
up and down conveyance of the furnace gases from the combustion chamber K
over the grate R, in order to convey the furnace gases from the combustion
chamber through the group d formed of water tubes away to the chimney S.

page_text: "
Figures 10-20 show other examples for two furnaces and for an up and down
conveyance of the furnace gases. In this case also successive chambers K¹ K² K³
are formed by tubes c on the combustion chamber K lying over the grate R which
chambers K K K are traversed by the furnace gases on their course to the
chimney S passing between groups of tubes d. In all the examples the course
of the furnace gases is indicated by arrows.
An equal or similar utilisation of the hot gases conveying the same in an
upward and downward direction or horizontally to and fro may also be produced
in a water tube boiler with more than two furnaces.
.
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:
A water tube boiler with an under boiler connected with an upper boiler by
means of groups of tubes characterised by a series of successive draught
chambers (KK) being formed in the separate groups of tubes by means of
tubes (c) arranged in close proximity to one another to form partitions, said
draught chambers being in part without tubes and serving for the better com-
bustion of the gases penetrating therein by forcing the latter to remain as long
as possible in the separate chambers and to become mixed with the oxygen of
the combustion air, thus assisting the combustion, and being in part however
filled with rows of tubes which serve as effective heating surfaces for the hot
gases coming from the combustion chamber (K) lying over the grate and on their
way to the chimney passing through the separate draught chambers (K' K³),
substantially as hereinbefore set forth.
Dated this 14th day of April 1899.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.