An Improvement in Boiler Fires.
Year: 1893

page_text: Date of Application, 27th Sept., 1893-Accepted, 28th Oct., 1893
COM DELE DI MULTICATION.
An Improvement in Boiler Fires.
I, RUDOLF EMIL KLOSTERMANN, of Dortmund, Germany, 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:-
In the Specification No. 8949 of 1891 is described a construction of boiler fire or
furnace specially adapted for burning coal dust, slack or other pulverulent fuel with
a forced draught. As described in that Specification, the fuel is laid on flat per-
forated plates covering respectively moveable trough shaped chambers, each
forming a closed ashpit into which air is blown under such pressure that the fuel
dust is kept floating above the plate in the currents of air rising through the
perforations. According to the present invention, instead of a flat plate being
employed to form the fire surface, a number of separate bars are placed side by side,
each bar being of the form of a hollow wedge so that the fire surface presents a
series of parallel ridges and furrows. By this construction there are obtained an
increase of strength, an extension of the perforated surface and great facility in
removing and replacing the fire bars.
Fig. 1 of the accompanying drawings is a transverse section and Fig. 2 is a
longitudinal section of the fire flue of a boiler, provided with fire bars according to
this invention.
Fig. 3 is a transverse and Fig. 4 a longitudinal section of one of the bars drawn
to an enlarged scale.
Fig. 5 is a transverse section of an ashpit chamber provided with wedge shaped
bars.
Each bar A may be made, as shewn in Figs. 1, 2, 3 and 4 with each end B
adapted to rest on the ordinary bearing bars C and dead plate D. The front of the
ashpit is closed by a cover E, through a hole through which air is forced in, it may
be by a steam injector F as shewn, or it may be by a fan or blower. A door Ġ is also
provided for cleaning the ashpit. As shewn in Fig. 5, the bars A may be laid on a
moveable ashpit chamber, several of which may be arranged side by side in the fire
place of a boiler, each chamber having its independent air supply. The holes
through the bars may be round or otherwise shaped, or they may be slits but they
must be comparatively small at their upper mouths, so that the dust does not
readily enter them, and wide at their lower mouths so that the air readily enters;
their general direction, which is upwards, may be more or less inclined to the vertical
as shewn in Fig. 3..
As there would generally be a greater thickness of pulverulent fuel in the furrows,
it is preferred to make the holes somewhat larger or more numerous near the lower
edge of each slope of the bar.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. A fire bar in the form of a hollow wedge having numerous perforations through
it, each with a narrow upper mouth and a wide lower mouth substantially as and for
the

page_text: 2. 'The use with moveable ashpits such as are herein described, of the improved
fire bar as shewn and illustrated in the drawings annexed.
Dated this 27th day of September 1893.
ABEL & IMRAY,
Agents for the Applicant.