Improvements in Steam Boilers.
Year: 1889

page_text: Date of Application, 30th Aug., 1889
Complete Specification Left, 22nd Feb., 1890-Accepted, 29th Mar., 1890
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
1, JOHANN FRIEDRICH AUGUST SCHNARRENDORF, of Hamburg, Germany, Chief
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in steam boilers, and is especially applicable
to those worked at a high pressure. Its objects are to increase the calorific effect of
the burning gases, and to facilitate the cleaning of all those parts liable to be fouled
by the products of combustion.
In view of the very high pressures recently introduced, especially in marine boilers,
it is preferred that boilers constructed according to this invention should be of
spherical or approximately spherical form, the shell being composed of two semi-
spherical or conoidal parts provided at their adjacent edges with outer and inner
flanges adapted to be bolted together.
The fire boxes-say, four in number-are arranged in the said lower part and cross
each other, their junction being developed on its upper surface into a socket to which
a circular fire box plate adapted to receive the inner ends of the boiler tubes is con-
nected by flanges and bolts. The boiler tubes radiate from the fire box plate above
mentioned to the upper part of the boiler shell.
I provide a damper adjustable at any desired height within the fire box plate, so
that the burning gases may be taken first outwards through the lower boiler tubes,
into an annular chamber or smoke box formed on the upper part of the boiler shell
outside the boiler tubes and back through the return tubes in the direction of the
uptake which springs from the top of the circular fire box plate.
The wall of the said annular chamber is composed of a number of detachable
plates each of which may be separately removed so as to afford easy access to the
boiler tubes.
The damper above mentioned may be adjusted in such a manner that one portion of
the burning gases shall pass direct into the uptake, and the other part through the
radiating boiler tubes.
The said four fire boxes and their flues may be separated by walls of fire-proof
material in such a manner that the burning gases will be conducted separately into
the socket above mentioned.
Dated this 30th day of August 1889.
PHILLIPS & LEIGH,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
I, JOHANN FRIEDRICH AUGUST SCHNARRENDORF, of Hamburg, Germany, Chief
Engineer, 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 :-
This invention relates to improvements in steam boilers, and is especially applicable
to those worked at a high pressure. Its objects are to increase the calorific effect of
the burning gases, and to facilitate the cleaning of all those parts liable to be fouled
by the products of combustion.
In view of the very bigh pressures recently introduced, especially in marine boilers,
it is preferred that boilers constructed according to this invention should be of
spherical, or approximately spherical, form.

page_text: Referring to the accompanying drawings, which are to be taken as part of this
specification and read therewith.
Fig. 1 is a vertical section through the middle of the boiler, and
Fig. 2, a horizontal section of the same on the line I-I of Fig. 1.
The shell of the improved boiler is composed of two semi-spherical or conoidal parts a
and 6 provided at their adjacent edges with outer and inner flanges c and adapted
to be bolted together.
The fire-hoxessay four in number-are arranged in the said lower part b, and
cross each other their junction, being developed on its upper surface into a socket g¹
to which a circular fire-box plate g adapted to receive the inner ends of the boiler
tubes k is connected by flanges h and i and bolts. The boiler tubes / radiate from the
fire-box plate g above mentioned to the upper part a of the boiler shell.
I provide a damper adjustable at any desired height within the fire-box plate g so
that the burning gases may be taken first outwards through the lower boiler tubes k
into an annular chamber or smoke box n formed on the upper part a of the boiler-
shell outside the boiler tubes k; and back through the return tubes k in the direction
of the uptakes, which latter springs from the top of the circular fire-box plate g.
The wall of the said annular chamber n is composed of a number of detachable
plates m each of which may be separately removed so as to afford easy access to the
boiler tubes k.
The damper above mentioned may be adjusted by means of chains and p passing
over rollers and pl in such a manner that one portion of the burning gases shall
pass direct into the uptake, and the other part through radiating boiler tubes k.
The said four fire boxes and their flues may be separated by walls of fireproof
material in such a manner that the burning gases will be conducted separately into
the socket above mentioned.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A boiler the shell of which is of spherical or approximately spherical or conoidal
form and provided in its lower part with a number of fire boxes developed at their
junction on the upper surface of the latter into a socket connected to a fire-box plate
which is adapted to receive the inner ends of boiler tubes radiating towards an annular
chamber or smoke-box, substantially as and for the purpose specified.
2. In combination with a boiler the shell of which is of spherical or approximately
spherical or conoidal form and provided in its lower part with a number of fire boxes
developed at their junction on the upper surface of the latter into a socket connected
to a fire-box plate which is adapted to receive the inner ends of boiler tubes radiating
towards an annular chamber or smoke-box, a damper within the fire-box and adjustable
in any desired position, substantially as and for the purpose set forth.
Dated this 22nd day of February 1890.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C., Agents for the Applicant.