Improvements relating to Boilers and Furnaces therefor.
Year: 1892

page_text: Date of Application, 23rd Apr., 1892-Accepted, 28th May, 1892
COMPLETE SPECIFICATION...
Improvements relating to Boilers and Furnaces therefor.
I, RUDOLF MÜLLER of Reikerstieg Hamburg in the Empire of Germany
Manufacturer 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 :-
The object of this invention is to utilize more fully the beat given out by the
combustion in a boiler furnace and to prevent the formation of smoke, and the
improvements principally consist in combining with the boiler proper a second boiler
or preliminary heater of special shape the steam and water spaces of which are in
communication respectively with the steam and water spaces of the main boiler,.
and which serves in its interior as a furnace space or combustion chamber.
In the drawings hereto annexed,
Fig. 1 is a front elevation of the main and preliminary boilers.
Fig. 2 is a central longitudinal section of the preliminary boiler and part of the.
main boiler.
Fig. 3 is a horizontal cross section on a central line.
Fig. 4 is a horizontal section through the hood or cover of the preliminary
heater, and
Fig. 5 is a section on line x Fig. 2.
The preliminary heater consists of a rectangular or cylindrical water jacket M
which is completely filled with water so that in height it extends only so far as
the usual water level line in the main boiler K, with which its water space is in
communication by piper. It also communicates by pipe with the steam space
of the said main boiler, this pipe leading from the highest part of the jacket M.
This jacket M has no extension or water part under the hollow space G which
its interior forms but is closed below by a grate D and is open above to be covered
by a hood as hereinafter described. E is a space left for a cleaning door and
Fa passage for the fire gases to pass to the tube or tubes of the main boiler. The
interior space G of the preliminary heater is intended to be filled more or less
with the fuel to be burnt and while being burnt. This fuel is supplied through an
opening in the hood closed by door s. The hood is a double cover of sheet.
metal with space between the two sheets. Through the sheet walls and through
the space pass lengths of pipe p open to the air outside the hood and communi-
cating with the interior space G. In these pipes p are throttle valves as shown
in Fig. 4. tt are openings in the outer sheet of the hood which allow air to
pass freely to the space between the sheets of the hood to prevent the latter from
being too highly heated. The fuel which should preferably fill the whole space G
burns near the grate D and is warmed throughout towards the top so that the
feed air which enters by pipes p and passes down through the fuel is warmed by
the upper layers of fuel until it enters the combustion zone. It is intended that
fresh air from below should only enter during the commencement of the action of
the furnace to assist the lighting up. A. blast pipe may be also arranged as
shown to draw or force air into the tube of the main boiler.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
The combination with a boiler of a preliminary heater consisting of a water
jacket M having an interior fuel receiving space G in communication with the tube
or equivalent space of the main boiler and closed below by a grate D and above

page_text: by a double hood with air inlets therein the whole for operation substantially as
described.
D: 02nd day of Amil 1900
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.