An Improved Furnace for Steam-boilers.
Year: 1898

page_text: Date of Application, 26th Sept., 1898-Accepted, 18th Feb., 1899
An Improved Furnace for Steam-boilers.
I, ALBERT KÖPPE, of Felix Strasse 311, Anger-Grottendorf, Leipzig, Mecha-
nical 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:--
The present invention has for its object a steam boiler furnace capable, as
an independent apparatus, of being readily applied to and detached from any
existing steam boiler. The apparatus itself forms a smaller steam boiler with
complete fittings and in which there is a furnace which is connected with the
flues of the existing steam boiler to which it is applied with its water and steam
spaces in connection with those of the latter.
The improved furnace is illustrated on the accompanying drawings, in which,
Fig. 1, represents a longitudinal section;
Fig. 2, represents a front view; and
Fig. 3, represents the connection of the improved furnace with an already
existing steam boiler, hereinafter referred to as the principal boiler.
A, is a chamber made of wrought iron or any other suitable material, of,
say, cylindrical shape flattened at the top, and through the whole length of which
extends one or a series of flues or fire-tubes, B, according to the size of the
principal boiler and the grate surface required in accordance therewith. Within
this fire-box are suitably provided furnace-bars, E, and bearers, C; and between
the walls, B, of the fire-box and of the chamber, A, the water space and steam-
space are provided; internal stays, J, of suitable strength being provided for
the support of the walls of the boiler, A, and of the fire-box, B. At the front of
the apparatus are provided the usual boiler fittings, including a fire-door, F,
for supplying fuel to the furnace grating, the door being lined with fire-clay on
the inside level-indicators, W, which allow observation of the height of water
in the boiler, A, at all times, the lower ends of the level indicators being fitted
with pet-cocks and waste pipes leading to the ash-pit; a man-hole, M, the cover
of which is fitted with one or more cross-heads according to size to facilitate
cleaning when, required; and stopcocks, G, to allow mud or water to be drawn
off when required. In fact, the improved apparatus is provided with all requisite
fittings, and rests on a frame-work forming the ash pit, the supporting frame
being adapted to the height of the fire tubes in the principal boiler, to which
the improved furnace is firmly connected, so that, in case of transport, the sup-
porting frame, U, (fitted with a door, R, for the ash pit, having air inlets, L.)
may be carried together with the apparatus.
The rear of the apparatus is provided with short tubes, S, for attachment to
connecting tubes of the principal boiler when the apparatus is to be applied
thereto, so that the improved apparatus is adapted to communicate with the
interior of the principal boiler by such tubes.
The improved apparatus has to be so set up, viz. its height must be so arranged,
that the gases of combustion from its grate readily pass under the principal
boiler or into its fire-tubes. The lower part of the apparatus may be constructed

page_text: of iron or of masonry, space being provided within it for the ashpit, to which
access is had by the doors, R, through which the ashes &c., can be removed. The
improved apparatus is connected with the support or lower part, U, by bands, D,
or otherwise in any suitable manner, and is so arranged that the whole apparatus
may be set on wheels or may be made otherwise movable, and, when the connec-
tions, S, with the principal boiler, K, are disconnected, can be removed therefrom.
The advantages obtained by the use of such an apparatus are that, by its use,
the frequent leaking of the main boiler is avoided, as the boiler walls are not
touched by the direct flame, so that irregular expansion of the material of which
the boiler consists cannot occur; the material of the principal boiler is pre-
vented from being liable to be attacked and destroyed by the melting heat that
is apt to occur when the wind or the direct rays of the sun are such as to bear
on the smoke stack so as to render the escape of the gases of combustion diffi-
cult; in case of repairs, the furnace can be readily removed and access had to
the several parts of the boiler; and the collapse of the firebridge or brickwork,
or of other such parts of the furnace as are used in boilers as heretofore con-
structed is avoided.
The improved apparatus may be used for boilers of any system (Cornish boilers,
tubular boilers, boilers with external and with internal furnaces) and any kind
of fuel may be used therewith, such as hard or soft coal, wood, peat, or the like.
If the improved apparatus is to be applied to a boiler having an under fur-
nace or fired from below, it is so placed in relation to the boiler that the fire
gases generated in the apparatus will pass under the boiler in the same manner
as if the usual furnace proper thereof were in use, the fire box of the apparatus
being connected to the fire box of the boiler with its furnace grate on the same
level as that of the latter; but, in such an application, it is unnecessary for the
apparatus to be furnished with fittings for showing the level of the water in it
as the boiler would be fitted with, inasmuch as the apparatus being on a lower
level than the boiler, the lowest level of the water in the latter will be higher
than the top of the apparatus itself, and the water level of the connected water
spaces will be shown by the boiler water fittings. When the apparatus has
become defective or is worn out, its simplicity of construction permits it to be
more readily removed than when parts of the principal boiler itself have to
be replaced or the whole boiler has to be done away with which always occasions.
considerable expense.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I déclare that what
I claim is:-
A furnace arrangement for a steam boiler characterized by its consisting of
a small internally fired boiler appropriate in size to that of the principal boiler,
and connected with the latter by a short tube or tubes, so that its interior steam
space and water space communicates with the principal boiler, while its gases
of combustion are led from its grate to the flues or fire-tubes of the principal
boiler, substantially as herein before described.
Dated this 26th day of September 1898.
DAY, DAVIES & HUNT,
Chartered Patent Agents,
321, High Holborn, London, W.C.,. Agents for the Applicant.