IMPROVEMENTS IN AND RELATING TO STEAM BOILERS OR GENERATORS
Year: 1881

page_text: LETTERS PATENT to Friedrich Hermann Felix Engel, Civil Engineer and
"
Patent Agent, in the City of Hamburg, Germany, for an Invention of
* IMPROVEMENTS IN AND RELATING TO STEAM BOILERS OR GENERATORS."
A communication from Andreas Wilhelm Schultze and George Meyer, both of
Hamburg, in the German Empire.
PROVISIONAL SPECIFICATION left by the said Friedrich Hermann Felix
Engel at the Office of the Commissioners of Patents on the 30th June 1881.
FRIEDRICH HERMANN FELIX ENGEL, Civil Engineer and Patent Agent, in the
City of Hamburg, Germany. "IMPROVEMENTS IN AND RELATING TO STEAM
BOILERS OR GENERATORS.' A communication from Andreas Wilhelm Schultze
and Georg Meyer, both of Hamburg, in the German Empire.
"
This Invention relates to improvements in steam boilers or generators composed
of several single boilers, of which one boiler only is constructed with a fire grate
for burning fuel whilst the other boilers, of which there may be two or more, and
each being enclosed in a mantle boiler, and is furnished with heating tubes are in
connection with the steam of the above mentioned main boiler by a steam pipe or
steam pipes, which steam circulates between the mantles and additional boilers
and passes through the beating tubes of the latter for generating steam from the
water contained in the additional boilers. The new generator therefor forms a
system of several boilers, one of which is of common construction and each of
which generates steam, which latter may either directly be taken from each boiler
or is delivered into one steam accumulator, from where it can be taken to be used
for driving engines or other machinery. Each boiler is furnished with safety
valves, steam traps, manometer, gauge glass, and all other armatures used for and
applied to steam-boilers generally, and the additional boilers, which must each be
about half size larger than the main boiler, are furnished with mantle boilers, one end
of which is accessible by removing an end plate that is fastened by screws to the
end flange of the mantle of each boiler.
This combined generator requires less fuel than one or several boilers constructed
with direct fire grate, and being able of generating the same quantity of steam and
of the same tension.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Friedrich Hermann Felix Engel in the Great Seal Patent Office
on the 29th December 1881.
FRIEDRICH HERMANN FELIX Enger, Civil Engineer and Patent Agent, in the
City of Hamburg, Germany. "IMPROVEMENTS IN AND RELATING TO STEAM
BOILERS OR GENERATORS." A communication from Andreas Wilhelm Schultze
and George Meyer, both of Hamburg, in the German Empire.
This Invention relates to improvements in steam boilers or generators composed
of several single boilers, of which one boiler only is constructed with a fire grate
for burning fuel, whilst the other boilers, of which there may be two or more,
each being enclosed in a mantle boiler, and furnished with heating tubes in
connection with the steam of the above mentioned main boiler by a steam pipe
or steam pipes, which steam circulates between the mantles and additional boilers
and passes through the heating tubes of the latter for generating steam from the
water contained in the additional boilers. The new generator therefor forms a
system of several boilers, one of which is of common construction, and each of
which generates steam, which latter may either directly be taken from each boiler
or is delivered into one steam accumulator, from whence it can be taken for use
for driving engines or other machinery. Each boiler is furnished with safety
valves, steam-taps, manometer, gauge glass, and all other fittings used for and
applied to steam boilers generally, and the additional boilers, which must each be
about half size larger than the main boiler, are furnished with mantle boilers, one
end of which is accessible by removing an end plate that is fastened by screws to
the end flange of the mantle of each boiler.
This combined generator requires less fuel than one or several boilers constructed
with direct fire-grate, and being able of generating the same quantity of steam and
that of the same tension.
The accompanying Sheet of Drawings represents the general arrangement of a
steam generator constructed after this improved system.
A designates a steam boiler with fire grate and flues of common construction,
which may be built after any one of the well known modifications of boiler con-
struction; B and C represent two additional boilers, each surrounded by a mantel-
boiler B and C¹. These additional boilers are preferably constructed with heating
tubes, as will be understood on reference to Fig. 1 of the Drawings..
The fittings of each boiler may be of any of the constructions now in use for
steam boilers generally, and as these do not form part of the Invention they are,
not represented in the Drawings.
The steam generated in the main-boiler A communicates by means of pipe E
with the free space between mantels or jackets and additional boilers B and C,
and by heating the water of the additional boilers this steam of the main-boiler
will effect the generation of steam in the additional boilers. The effect will be
the better the greater pressure is given to the steam of the main boiler. From
boilers B and C the steam is taken off and used for driving motors or engines, or
such purposes as may be required.
Instead of two additional boilers more or less boilers may be applied.
By producing such secondary steam in an additional boiler or boilers through
the said primary steam, generated by direct firing of a main-boiler, a great saving
in fuel is ensured.
Having now described the nature and particulars of the said Invention in such
wise that the same may be readily carried into practical effect, I claim,-
The combination of a main-boiler with one or more additional boilers, in such

page_text: manner that the steam of the main-boiler generated by direct firing is used for
producing secondary steam in the additional boilers, as and for the purpose herein
set forth and substantially as shown by the Drawings.
In witness whereof, I, the said Friedrich Hermann Felix Engel, have hereunto
set my hand and seal, this Seventh day of December, in the year of our
Lord One thousand eight hundred and eighty-one.
F. H. F. ENGEL. (L.S.)