Improvements in or relating to Locomotive and other Furnaces.
Year: 1899

page_text: Date of Application, 5th Dec., 1899-Accepted. 17th Feb.
1000
5
COMPLETE SPECIFICATION.
Improvements in or relating to Locomotive and other Furnaces.
I, FRANZ SCHRÖTER, Manufacturer, of Rumburg, Bohemia, in the Empire o
Austria, do hereby declare the nature of this invention and in what manne
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
In order to produce, on a reduced grate-surface, equal heat effects, furnaces
have been provided with devices for the admission of secondary air-currents
for the purpose of driving the flames and smoke gases in a whirl above the grate.
Owing to such arrangement and the consequent mixing of the smoke gases with
the flames the particles of coal and the unconsumed smoke gases carried by the
flames are thoroughly consumed, thereby producing the same or greater heat
effects than could have been obtained with a full grate surface unprovided
with such additions.
The present invention relates to a device of this kind and consists in arrang-
ing above the fire grate, a double set of open bars in the middle of the furnace
between the interstices of which the secondary air-current enters the fire space.
In this manner a great number of energetic air-currents act, at different heights,
upon the rising smoke gases and flames, driving them against the heating sur
faces and the smoke gases or mixtures of gases and air coming from the sides,
producing thereby, at different heights, whirls or currents whereby the object
pointed out above is effectively obtained.
In the accompanying drawings
Figure 1 represents a vertical cross-section of the device.
Figure 2 is a side elevation of same.
Figure 3 is a section on the line A-B of Figure 1, and
Figures 4 and 5 show bars of the secondary grate in sectional side view and
elevation.
Figure 6 represents a longitudinal section of a fire box of a locomotive boiler
the grate of which is provided with the improved device.
The device consists of a correspondingly broad plate 1 provided with a hollow 2
and developed in its upper part to an open trough 3 and with broad sides 4,
the whole arrangement forming a chamber provided with a perforated partition-
vall enclosed by broad side walls 4 and opening downwards.
As seen from the drawing, the side walls 4 are provided with slots or recesses 5
xtending the whole length of the wall, and arranged at suitable intervals, said
ecesses being intended to receive the ends of the grate bars 14.
igure 6 there are three such devices provided in the fire chamber, the two
As seen from
ituated at the ends being but partially carried out and having no hollow 2 in
heir plates 1, since the air is intended to reach from this part only to the middle
f the fire chamber.
The devices are secured by their side walls 4 to carrier plates 7 extending the
hole length of the fire chamber and forming a channel 6.
For the purpose of regulating the admission of the secondary air-currents,
Ijustable plates are provided in the channel 6 being secured to a shaft 9
[Price 8dN

page_text: mounted in the plate-frame. As shown in Figure 6 the shaft 9 is actuated from
the outside by means of a wheel gearing 10 so that the plate or plates 8 can be
caused to more or less cut off the air supply to the space between the bars. Cor-
responding to the object of the secondary grate, the grate bars are arranged in
the following manner:
On a flat bar 11, the stouter ends 14 of which are located in the slots or
recesses 5 described above, are arranged, at even distances from each other,
ribs 12 in such a manner that when suitably placed in the frame, each rib of
one bar will always lie between two ribs of the bars above and below. In this
manner a perforate or trellis grate is formed, through the interstices 13 of which
the air enters in numerous currents after having already been divided by the
plates 1 into a number of currents corresponding to the number of such plates.
The ribs, may, of course, be of any section and the whole device is protected
against the burning particles falling from above as well as against the enormous
heat effects by a roof-like device or cap. plate 15 made of vulcanite stone, fixed
in. the frame troughs 3 by means of cement 16.
"
1
Having now particularly described and ascertained the nature of my said 'in-
vention and in what manner the same is to be performed, I declare that what
I claim is―
2.
1. In locomotive and other furnaces a projecting air supply device forming a
secondary grate surface arranged above the grate comprising a series of ribs of
any suitable section arranged on the sides of frames and forming with them the
air chamber, the ribs being so arranged as to leave interstices between adjacent
ribs, the ribs being arranged or formed on bars placed in slots in the frames
and forming passages for the admission of air substantially as described.
2. In a device of the kind described means for regulating the supply of air
to the hollow frame comprising a shaft carrying a plate or plates, as 8, substan-
tially as described.
3. A device of the kind described comprising frames the sides of which are
slotted to receive longitudinal grate bars provided with ribs, so formed and
arranged that a series of separate air passages are formed communicating between
the inside and outside of the device, and means for regulating the admission of
air to the interior substantially as described.
4. The complete secondary grate for furnaces, substantially as described or
illustrated in the accompanying drawings.
Dated this 5th day of December 1899.
BOULT, WADE & KILBURN,
Agents for the Applicant.