IMPROVEMENTS IN STEAM GENERATORS
Year: 1884

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We LEBRECHT STEINMÜLLER and CARL STEINMÜLLER both of Gummersbach in
the German Empire, Engineers do hereby declare the nature of our Invention for
IMPROVEMENTS IN STEAM GENERATORS and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
This Invention relates to certain "Improvements in Steam Generators and has
special reference to Letters Patent, granted to us on the 18th day of September
1876 N° 3646.
Our Invention consists in an improved construction of tubular steam generator,.
by which a more perfect circulation of water is obtained while the steam is
separated from the water in such a manner that it is rendered perfectly dry,
without being previously superheated.
We accomplish our object in the following manner which we will now proceed
to describe by aid of the accompanying Drawings in which are shown various
modifications and arrangements for carrying out our Invention. The same letters
of reference indicate the same parts in each of the Figures.-Figure 1 shows a
longitudinal section. Figures 2 and 4 transverse sections, and Figure 3 a sectional
plan of the combined steam and water receiver. Figures 5 6 and 7 show respectively
a longitudinal section, a sectional plan and a transverse section of the water
chambers hereinafter described; Figures 89 and 10 show respectively a longitudinal,
a transverse and a sectional plan of the modified or alternative arrangements for
producing dry stean, Figures 11 and 12 show respectively a longitudinal and a
front elevation of a complete steam boiler with our Invention applied thereto.
The generator in general consists of two wrought iron chambers A and B
Figures 11 and 12 B being the boiler proper and A the combined steam and
water receiver. The lower boiler B consists of two wrought iron chambers CC
oue one at each end. These chambers C C are formed of wrought iron welded to
the proper. form. The two chambers C C are connected with each other by a
number of tubes D D.: These tubes are rolled into the chainbers in a most simple
manner either by means of a hand roller or by other suitable means.-Above the
body of the boiler B the separate receiver A is placed, which communicates near
each end with the set of tubes. D D through the connections F and G and the two
said chambers C C. The body of the boiler B is entirely filled with water, while

page_text: the top chamber A is partly filled with water and partly with steam. The outer
plates of the chambers CC are provided with openings E so as to allow the ends
of any of the tubes D D to be easily reached examined or cleaned, and any tube
may be easily removed and replaced without disturbing the others. The. outer
plates and the tube plates are stayed by stay bolts which pass through and serve
at the same time for securing the lids for the openings. The top boiler A is
connected with the set of tubes D D by angle irons, bolted or rivetted to the
communicating tubes F and G.-The tube F effecting the said communication, at
the front end of the body of the boiler B, with the top chamber A is made to rise
within the same, to a convenient level, at or above the water level; thus the front
part of the top chamber A communicates with the hottest part of the body of the
boiler B, while the connecting tube G at the other end of the generator is made to
terminate at or about the bottom surface of the top chamber A and communicates
with the cooler end of B.-The tube F inside the top boiler is covered by a
rectangular box H made of sheet iron or any other suitable metal, the side walls
and front wall of which dip into the water, while the back of the box is open and
thus communicates with the steam space. The box H may be constructed with
plates of varying forms and patterns, so as to secure a still more perfect drying of
steam. The said box H may be provided with a bottom plate or not. The water
in the hottest part of the set of tubes is most charged with steam, and this mixture
of steam and water, being consequently of much lighter specific gravity will rise
by the aforesaid tube F to above the water level of the top chamber A and flow
along the box H where the steam will be completely liberated from the water and
allowed to escape thoroughly dried into the steam space.-At the same time the
water deprived of its steam gains higher specific gravity and descends by the other
communicating pipe G to the back of the body of the boiler B thus forming a
dense water column which forces the mixture of steam and water to leave the
tubes D D rapidly, and creates an equal continuous and powerful circulation of
the water within the boiler.-A modification of the above described Invention to
separate the steam and water and likewise to render the steam dry is shown in
Figures 8, 9 and 10, by an arrangement of different circular or rectangular plates K
joined together and placed above the front communicating tube F, the latter being
provided with an overflow pipe. These plates are fitted with serpentine channels $
so as to force the mixture of steam and water to take a serpentine course, and
provided with holes M M allowing the water to fall back to the water level while
the steam escapes into the steam space of the top chamber A.
Hitherto the great disadvantage of all tubular boilers is that they produce wet
steam, by this Invention an absolute dry steam is obtained. The generator is also
of very great efficacy as regards its evaporating power, and there is no risk of the
tubes being destroyed by the intense heat, as the constant circulation of the water,
prevents the accumulation of steam within the same, and moreover the greater
part of the solid impurities are retained in the top boiler, the feeding water being
introduced at a point where it mixes at once with the hottest water, and thus is
suddenly heated almost to the steam temperature. It is also a great advantage
that all tubes can easily be reached for inspection and other purposes. In the front
plate of the wrought iron chambers C C openings are provided which are placed
opposite the centre of each tube and correspond in diameter, with the outside
diameter of the tubes the latter being as before mentioned rolled into the inside
plate of the chambers, without requiring any tightening material, as is usually
the case.
Thus the cleaning of the tubes is with facility performed by simply
loosening the bolts for each tube.
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 :-
.
Firstly The construction and application of the box H connected to the hottest
part of a steam boiler B in which the rising mixture of steam and water is'

page_text: separated from the steam space for a certain time, thereby causing the liberation
of the steam from its containing water and obtaining a perfectly dry steam,
substantially as hereinbefore described and illustrated by the accompanying
Drawings.
Secondly: The application of plates of varying forms and patterns in connection
with this box as and for the purposes hereinbefore described.
Thirdly: The above described arrangement for securing the separation of steam
from water, by giving the rising mixture of steam and water a serpentine course
substantially as and for the purposes hereinbefore described.
Fourthly: The construction and application of wrought iron chambers,
manufactured by welding boiler plates so as to form one welded piece, substantially
as and for the purpose herein described set forth and illustrated by the
accompanying Drawings.

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