Improved Fire Box for Stationary and Portable Steam Boilers.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improved Fire Box for Stationary and Portable Steam Boilers.
I, FRIEDRICH RITTER VON DORMUS in Floridsdorf near Vienna in the Austrian
Empire, Engineer, do hereby declare the nature of my said invention and the
manner in which the same is to be performed, to be particularly described in
and by the following statement :—
The subject matter of the present invention is a fire box which, including the
boiler surrounding the same is open to the rear in its entire breadth and height-
water circulating between the boiler and the fire box.
Fig. 1 is a longitudinal section and Fig. 2 a vertical section at a right angle to
Fig. 1.
The side walls and the front wall reach beneath the grate the two side walls
being connected beneath the grate by means of a rod a in order to prevent the
same from bulging. This rod a serves also as bearing for the tools for stirring the
fire which can be effected from the lower side of the grate.
The
A water reservoir A is inserted in the rear opening of the space so produced and
communicates with the main boiler on the one hand by means of the pipe or tube b
by means of which the steam from the water reservoir finds its way into the main
boiler and. on the other hand by means of laterally arranged pipes or tubes c_so
that the water from the main boiler can pass into the water reservoir. These tubes
and their connections, by means of which the same are attached to the boiler and
the water reservoir are not located in the fire box but exterior to the same.
water reservoir can be readily cleaned by means of larger and smaller openings
arranged between the bolts and closed by suitable flanges and screws said parts
being located exteriorally of the fire space or combustion chamber. The opening
in the combustion chamber above the water reservoir is closed by a plate m which
latter is provided with a closable opening through which the flame tubes can be
observed and if necessary the fire be stirred. The above described water reservoir
can be replaced by an adjustable or stationary deflector preferably of refractory
material. On the opposite side to the water reservoir that is, on the front wall of
the combustion chamber near the flame tube I arrange a fire bridge B directed at
an incline upwards and composed of refractory material. The grate, which is
located beneath the water reservoir is arranged at an incline and the stoking can
be effected from beneath the said grate.
When coal is used which readily produces slag the lower end of the grate can be
provided with a flap grate n which can be flapped down in order to be able to
remove the slag from the grate. The water reservoir or the reflector replacing the
same, rests on lateral bearings d. Plates form the outer walls of the combustion
chamber.
These plates reach so far downwards as is required by the height of the layer of
coals and a part of the same can be hinged in order that the stoker can have access
to the upper surface of the fire.
Fuel is fed into the space and glides with little stoking down the grate
according to the combustion of the fuel on the same said fuel being gasefied in the
space between grate and water reservoir and reaching the lower part of the
grate in the form of coke when the combustion is completed. The gases mixed
with air ascending in the space are guided into the space K by means of the
water reservoir A where the same become mixed with the gases ascending in the
space and are perfectly consumed.
The fire box being open to the rear permits in contradistinction to ordinary
boilers of like type and about like weight of a larger grate being used so that more
air is fed to the fuel; but this quantity of air will not be sufficient when the firing

page_text: is increased and for this purpose the walls are provided with air inlet openings
the size of which can be regulated by means of a suitable slide. The combustion
is continuous so that all the disadvantages are avoided which are caused by periodical
firing and also through opening the furnace door and consisting mainly therein, that
the sudden ingress of a large quantity of cold air hinders the combustion and acts
disadvantageously on the boiler in consequence of the sudden lowering of the
temperature. The separate stages of combustion are such that a perfect combustion
of the fuel is attained with the minimal excess of air. The stoker's stand is lowered
in the centre in order to enable him to attend to the stoking from beneath the
grate.
Having now particularly described and ascertained the nature of my said inven-
tion and the manner in which the same is to be performed, I declare that what I
claim is
1. The manufacture and the application of fire boxes partly or wholly open to
the rear in order that the grate can be so arranged that the same is accessible from
beneath for stoking, substantially as described and shown in the drawing.
2. The arrangement of the water reservoir so that the same lies. partly within
the combustion space, substantially as described and shown in the drawing.
3. The arrangement of the connection tubes and the flanges for connecting the
water reservoir with the main boiler exteriorally of the boiler and the combustion
space, substantially as described and shown in the drawing.
4. The arrangement of larger and smaller openings with flanges and screws for
closing same between the rows of bolts exterior to the boiler, not in the combustion
chamber but immediately in the front end of the water reservoir, substantially as
described and shown in the drawings.
5. Replacing the water reservoir A (Claim 2) by a stationary or adjustable
deflector, substantially as described and shown in the drawing.
6. The arrangement of the grate so that the same protrudes from the fire box,
substantially as described and shown in the drawings.
7. In locomotives, lowering the centre of the stoker's stand to beneath the frame
work so that the grate can be stoked from beneath, substantially as described and
shown in the drawings.
8. The combination of the water reservoir A or the deflector with the fire
bridge B substantially as described and shown in the drawings.
Dated 9th April 1892.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.