Year: 1885

page_text: We, LEON PETRY of Düren near Cologne, and WILHELM WALTHER of Deutz
near Cologne, German Empire, Engineers, do hereby declare the nature of our
invention to be as follows:-
Our invention relates to improvements in tubular steam generators of the kind
in which inclined rows of water tubes are connected at the higher end by upright
connecting tubes or chambers to an upper transverse steam and water chamber and
at the lower end by other upright connecting tubes or chambers to a lower
transverse water chamber, the said upper and lower water chambers being con-
nected by a pipe so as to establish a complete circulation for the water throughout
the generator.
We
According to our improvements we construct such generators as follows.
arrange the inclined water tubes in superposed rows in such manner that the
tubes of the one row are situated over the spaces between the tubes of the row
below, thus forming inclined rows of tubes transversely in the direction from top
to bottom of the generator. At the ends each such transversely inclined row of
tubes is connected to a correspondingly inclined connecting tube of rectangular
cross section, which connecting tubes fit closely side by side so as to constitute a
transverse water chamber having partitions at each row of tubes connected thereto.
The connecting tubes of the front or higher ends of the water tubes are closed at
bottom and communicate at top with a transverse water and steam chamber, which
is provided at the point of connection with the tubes with a long narrow upwardly
projecting nozzle, forming a continuation of the tubes, so that the water and steam
rising from these are discharged into the steam chamber at some point above the
bottom. The connecting tubes of the rear or lower ends of the water tubes are
closed at top and communicate at bottom with a lower transverse water chamber.
This water chamber is of annular form with a separate central compartment, con-
taining perforated plates, screens, or other suitable filtering media for separating
solid matter from the water flowing through. The feed water is made to flow into
the upper steam and water chamber and after becoming heated and depositing a
portion of its solid constituents therein, it passes through a connecting pipe into
one end of the central compartment of the lower water chamber, and after flowing

page_text: through this and depositing the remainder of its solid matter therein, it issues into
the annular space, whence it flows through the back inclined connecting tubes, the
water tubes, and the front inclined connecting tubes, back, together with the
generated steam, into the upper steam and water chamber. The central compart-
ment of the lower water chamber is so arranged that its contents can be readily
withdrawn from time to time and cleared of deposit.
By the above described arrangement of transversely inclined rows of water tubes
connected to correspondingly inclined end connecting tubes, the heat of the flames
and combustion gases is effectually taken up by the water tubes, while the
difficulties attendant on the use of vertical connecting tubes in combination with
such an arrangement of water tubes, as heretofore employed, are obviated. At the
same time the feed water is effectually freed from solid matters before entering the
water tubes.

page_text: Improvements in Tubular Steam Generators.
We, LÉON PETRY, of Düren near Cologne, and WILHELM WALTHER, of Deutz
near Cologne, German Empire, Engineers, 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:—
Our invention relates to improvements in tubular steam generators of the kind
in, which inclined rows of water tubes are connected at the higher end by upright
connecting tubes or chambers to an upper transverse steam and water chamber and
at the lower end by other upright connecting tubes or chambers to a lower
transverse water chamber, the said upper and lower water chambers being con-
nected by a pipe so as to establish a complete circulation for the water throughout
the generator.
Our improved construction of such boilers is shewn on the accompanying
drawing in which Fig. 1 shews a longitudinal section, and. Fig. 2 partly a front
view and partly a cross section on line x y Fig. 1.
The water tubes A inclined from front to back are arranged in horizontal rows
Bo that the tubes of one row are situated over the spaces of the next, whereby they
constitute also rows lying in a slanting direction, by preference at an angle of
about 60°.
The tubes of each slanting row are fixed at their front ends in a slanting tube B
of rectangular section, and at their back ends to a similar tube B1, which con-
necting tubes B B¹ are arranged closely side by side. The front tubes B are fixed
directly by means of angle irons to the upper boiler C, in which a long rectangular
open box or trough a forms an inward extension of these tubes. The back tubes B¹
are also connected directly at their lower ends to a boiler or feed water heater D.
The boilers C and D are connected by circulating tube E. The circulation in the
boiler takes place as follows.
Water and steam pass from the tubes A into the front tubes B in which they
rise into the upper boiler C from which the water flows down the circulating
tube E into the boiler D; thence it rises into the tubes B¹ and back into the
tubes A again.
By arranging a slanting row of tubes in combination with slanting connecting
tubes according to this invention, the advantage is obtained that while the hori-
zontal rows of water tubes are arranged over the spaces of the row immediately
below, as is requisite for an effectual utilisation of the fire heat, the circulation
through the inclined connecting tubes is just as effectual as in the ordinary
arrangement of vertical tubes, and the use of zig-zag connecting tubes, such as
have heretofore been necessary with the above described alternating arrangement
of the tubes A, and which could only be made of cast iron, is obviated.
The rectangular water tubes B B¹ lying closely side by side, practically con-
stitute a large water chamber, divided by inclined partitions, which allows of as
perfect circulation of the water as an ordinary rectangular water chamber with
internal stays but which has the advantage over these of greatly increased
strength, and of being more conveniently removable and replaceable in case of

page_text: repairs; and by keeping a reserve of the tubes, such repairs can be effected with
comparatively little loss of time and small cost.
The separation of deposit and the prevention of the formation of scale in the
water tubes A is effected as follows. The feed water flows into the upper boiler C
so as to become heated and effect the separation of the lime salts. A portion of
the latter is already deposited in the upper boiler, while the finer particles are
carried through the circulating pipe E to the lower boiler D. In the lower boiler
is a horizontal cylindrical filter & shewn in longitudinal section at Fig. 3, the water
being made to flow from E through pipe b into the filter, after passing through
which it issues through pipe c into the boiler D deprived of all sediment.
The connecting pipes B are preferably rivetted together at their upper ends by
screwed rivets e as shewn in the enlarged detail sections at Figs. 4 and 5, and are
fixed to the boiler by angle irons.
The sides of the tubes of the outer rows are formed square with the boiler as
shewn for fixing the angle iron. The tubes A are fixed in B B¹ by expanding
their ends.
The boiler C is provided with brackets on its upper side which rest upon
rollers carried by a framing; the boiler has thus perfect freedom in expanding
and contracting.
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 in respect of tubular steam generators of the kind herein referred to is :-
1. Arranging the water tubes A to lie both in horizontal and inclined rows and
connecting the inclined rows to inclined connecting tubes B B¹ of rectangular
section lying closely side by side, and forming together rectangular water chambers
having inclined partitions formed by the sides of the separate tubes, substantially
as herein described.
2. Connecting the inclined tubes B B¹ directly by means of angle irons to the
upper boiler C and lower boiler D, and combining therewith a box or trough a
forming an extension of the tubes B inside the boiler C, substantially as herein
described.
3. The use in combination with the lower boiler D of a horizontal filter
cylinder d arranged and operating as herein described.
Dated this 10th dow of dust 188f
ABEL & IMRAY,
Agents for the Applicants.