AN IMPROVED METHOD OF RETURNING THE EXHAUST STEAM OF STEAM ENGINE CYLINDERS TO THE BOILER
Year: 1884

page_text: COMPLEIE SPECIFICATION.
I, HERBERT JOHN HADDAN, of 67, Strand, in the City of Westminster, Civil
Engineer, do hereby declare the nature of my Invention for AN IMPROVED
METHOD OF RETURNING THE EXHAUST STEAM OF STEAM ENGINE CYLINDERS TO
THE BOILER, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
In the accompanying Drawings:
Fig. 1 is a perspective representation of a steam engine and its boiler provided
with this Invention, the nature of which is defined in the claim or claims
hereinafter presented, the brickwork in such Figure being shown, as partially open
or removed, in order to exhibit the fire place of the boiler, and additions thereto, to
be described.
Fig. 2 is a vertical and longitudinal section of the exhaust steam educts and their
appurtenances or injector and cocks, to be explained.
In carrying out this Invention I combine with the steam engine and its boiler or
steam generator, not only another or auxiliary boiler for generating steam at a
pressure or tension higher than that of the main boiler, but devices whereby by
means of such higher pressure steam, the exhaust steam from the engine cylinder,
may be utilized by being driven into the main boiler. I also have in connection
with such devices means of discharging the exhaust steam without driving it into
the boiler by such higher pressure steam and devices.
In the Drawings, A denotes the steam engine and B the boiler for supplying it
with steam for operating it or its piston, such steam being conducted from the
boiler to the valve chest, by means of a pipe C. The exhaust steam pipe or educt
is shown at D, as provided with a branch pipe E, leading out of it and opening
into the atmosphere, such branch pipe being furnished with a globe valve or
stop-cock F.
The pipe D, opens into an injector G, which as shown in Fig. 2 is provided with
two nozzles a and b, arranged as represented. From this injector a pipe H, leads
and opens into the boiler B. Another pipe I, leads steam from an auxiliary steam

page_text: generator into the injector, such auxiliary generator being in the Drawings, shown
as heated by the fireplace of the main generator, whose grate is exhibited at K.
This auxiliary steam generator as represented at L, consists of a hollow cylinder
or tight vessel c, pipes d, d, extending down from and opening out of it, and closed
at their lower ends, and a series of pipes e, opening out of each pipe d, and
extending into the fire-place of the furnace at one side thereof. Each pair of
pipes c, of each set connected at their inner ends by a tubular connection or bend f.
From the above it will be seen that when the auxiliary boiler or generator L is
supplied with water for the production of steam, such water will extend into the
pipes e, and be heated by the same fire, by which the main boiler is heated. The
auxiliary boiler however may be otherwise constructed and arranged with the main
boiler and be heated by a furnace or fire-place separate from that of the main boiler,
but by employing one fire-place for both boilers or steam generators, a saving in
fuel and in other respects is effected.
The vessel c, is for holding the steam generated in the auxiliary boiler, which
steam is to be at a higher pressure than that of the main boiler.
The exhaust steam of the engine passing into and up the pipe D, will on the
cock k of the injector being opened, be met by the jet of steam rushing through the
injector, and by it will be driven into the main boiler, the cock in the branch pipe
being closed at the time.
The pipe H, is provided with a cock g, for closing communication through such
pipe as circumstances may require.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The combination of a steam engine and its boilers with an auxiliary boiler
and means or devices through which steam from such auxiliary boiler may be
.caused to intercept the exhaust steam of the engine and force it into the boiler of
such engine; all being substantially as set forth.
2. The combination of a steam engine, its boiler and the furnace or fire-place of
the latter, with an auxiliary boiler applied to said furnace or fire-place so as to
be heated thereby, and with means or devices through which the steam from
such auxiliary boiler may be caused to intercept the exhaust steam of the engine
and force it into the main boiler, all being substantially as set forth.
3. The combination of a steam engine and its boiler with an auxiliary boiler and
with an injector communicating therewith and with the exhaust educt or pipe of
the engine and also with the main boiler, in manner substantially as described,
whereby steam from such auxiliary boiler may be caused to pass through the said
injector and by it be made to intercept the exhaust steam and force it into the
main boiler, thereby saving such steam from being wasted.
4. The combination of a steam engine and its boiler, an auxiliary boiler, and an
injector communicating therewith, and with the exhaust pipe and main boiler of
the engine, essentially as described, with a branch exhaust pipe provided with a
stop cock, and serving to lead the exhaust steam away from or to prevent its
passage into the pipe when it may not be desirable for such exhaust steam to be
driven into the main boiler of the engine.
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