Improvements in Water-tube Steam Boilers.
Year: 1899

page_text: Date of Application, 9th Dec., 1899-Accepted, 13th Jan.,
1900
COMPLETE SPECIFICATION.
Improvements in Water-tube Steam Boilers.
I, CARL DANIEL MOBERG, of Mek. Verkstaden, Vulcan near Norrköping, in the
Kingdom of Sweden, Mechanical Engineer and General Manager, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to an improved construction of the well-known boilers
composed of one lower water-tube boiler and one upper cylindrical boiler forming
a steam and water reservoir or drum, which two boilers are united at their ends
by means of water-chambers or boxes, in each of which terminate a number of
tubes of the lower boiler. In the usual construction of such boilers hitherto,
each water chamber or box has been connected with the upper boiler or drum
by means of a single pipe which thus acts as the means of communication with,
as well as from, said boiler for all the tubes terminating in the chamber or box.
Said pipe does not form a sufficiently wide connection between the upper and the
lower boiler, and for this reason the circulation intended to be effected by the
arrangement referred to, is materially interfered with. The present invention
has for its object to overcome this disadvantage by placing several connecting
pipes between the water chamber or box and the steam and water drum. By
this means the additional advantage is gained that the furnace-gases, which
in discharging flow past the rear ones of the upwardly-directed pipes mentioned,
will be brought in contact with a greater number of pipes than heretofore,
whereby a better utilization of the heat of the gases will result.
The drawings annexed shows a boiler of the system referred to, viewed in
Figure 1 from one side, and in Figure 2 in a transverse section, Figure 3 repre-
sents a transverse section of the uptake pipes. The water-tubes a forming the
lower boiler have a slightly-inclined position, as usual, and are arranged zig-
zag in groups. The tubes belonging to the same group enter at the front end
The
in one common water-chamber or box b and at the back in a similar one c.
chambers or boxes mentioned are constructed wider at the top than at the bottom
in the direction parallel to the tubes a and are placed in communication with
the drum d by means of several pipes ƒ and g which are likewise arranged in a
zig-zag form as seen in Figure 3. The number of pipes f and g is for each cham-
ber or box suited to the number of tubes a entering the chamber or box, so that
the circulation can take place unimpeded in the usual direction, i.e. upward in
5 the pipes f and downward in the pipes g. By the construction described a more
effectual circulation and dryer steam are produced, in view of the fact that no
rush of steam, mingled with foam in the pipes f and g, as compared with using
one such pipe f or g only. Moreover, an advantageous preliminary heating of
the water is attained when the latter descends through the pipes 9 which are
0 surrounded by the furnace-gases. The chamber or box may vary in shape at
the top, for instance be cut off obliquely, be stepped, with one pipe ascending
The plain shape shown in the
from each step or in any other suitable manner.
drawing, however, is to be preferred. The chamber or box 6 or c may also be

page_text: given the same width at the botom as at the top, depending on the number of
pipes and g.
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
In steam-boilers composed of one lower water-tube boiler and one upper
boiler or drum which at their fore ends and at their rear ends communicate
with each other by means of several water-chambers or boxes in each of which
terminate a number of tubes of the former boiler, so as to admit of a circulation,
the construction that each chamber or box communicates with the upper boiler
or drum by means of several ascending pipes, the chamber or box being for this
purpose widened sufficiently in the direction parallel to the first-mentioned tubes
substantially as herein described and illustrated in the accompanying drawings.
Dated this 9th day of December 1899.
11
'HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant."
'HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant."