Improvements in Steam Boilers.
Year: 1898

page_text: Date of Application, 30th Aug., 1898-Accepted, 12th Nov., 1898
Improvements in Steam Boilers.
We, HEINRICH SILLER, Boiler Manufacturer and PAUL HALFMANN, Engineer,
of the City of Barmen, in the German Empire, Bockmühlstrasse 10, 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 steam boiler of the type of Lancashire
having two furnace tubes or the type of Cornwall fitted with one furnace tube or
generally such types of boilers having a great water space. The object of this
invention is to comprise a contrivance which is adapted to produce in the boiler
a continuous circulation of water.
We accomplish this result by embracing both or one furnace tube on the front
end where the combustion of the fuel takes place, by a peculiarly formed jacket
which is able to separate and close in a quantity of water and hold it round the
hottest place of the boiler.
Hence this liquid may be quicker evaporated and the produced steam and
mixture of water and steam on leaving the jacket act like a sucking pump
producing thus a continuous circulation of water a quicker generation of steam
and minimising by some measure incrustions.
In order that our said invention may be properly understood, we have hereunto
appended a sheet of explanatory drawings illustrating a boiler as constructed in
accordance with our invention.
In these drawings,
Figure 1 is a cross section of a boiler with two furnace tubes fitted with the
water circulating device;
Figure 2 is a longitudinal section of Figure 1;
Figure 3 is a cross section of a boiler with one furnace tube having arranged
the new device.
Referring to Figures 1 and 2 a is the shell of the boiler b, b are the furnace
tubes in which are placed as usually the front plate c and the fire bridge d which
carry the fire bars e.
The front end of the boxes b, b are surrounded by a jacket J. This jacket
consists of a front and a rear wall f, g made of one or more straight plates of
sheet iron and suitably fixed to the furnace tubes b.
To these walls is fastened by suitable means a shell h, running almost parallel
with the contours of the furnace tubes and being also held or supported by
girders i.
The jacket is left at the bottom wide open. Above it is provided with two
outlets k for each furnace tube, which are formed conically both lengthways and
crossways.
From a glance at the figures it will be seen that the jacket is placed round the
hottest place of the boiler where the combustion takes place and that the jacket
is filled with water which is closed therein and mostly separated from the remain-
ing water.

page_text: The enclosed water is therefore quicker evaporated and steam or the mixture
of steam and water may easily escape through the outlets k producing then a
sucking action so that fresh water may continuously enter the jacket and evaporate
as before. The water outside the jacket is constantly agitated so that the genera-
tion of steam is promoted to a high degree.
In Figure 3 is shown a boiler having one furnace tube according to which the
jacket is shaped.
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 is:
In a boiler with great water space the arrangement and use of a jacket sur-
rounding the furnace tubes or tube at the fire place which being open at the
bottom is provided at its top with two lateral outlets for the escape of steam and
the mixture of steam and water which is developed within the jacket substantially
as described and delineated.
1000
HEINR. SILLER and
PAUL HALFMANN
By A. Daumas,
Agent for Applicants