Improvements in or connected with Furnaces.
Year: 1896

page_text: Date of Application, 16th Dec.. 1896-Accepted, 6th Mar., 1897
COMPLETE SPECIFICATION.
Improvements in or connected with Furnaces.
We, JOHANN KÖGLER and FRANZ SCHRÖTER both of Schönfeld, Bohemia in-
the Empire of Austria, Machinist and Factory Proprietor respectively, 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:
This invention has for its object a grate insertion for furnaces, which is intended
to produce a thorough and smokeless combustion of the fuel thrown on to the
grate by admitting and conveying fresh air uninterruptedly and automatically
into the combustion chamber through the hollow grate insertion, which at the
sides is in the form of a grating or lattice work, a considerably diminished.
consumption of fuel being thereby obtained, as the grate insertion takes up.
approximately one third of the grate surface, so that (as against full grate-
surfaces) only two thirds of the grate surface is covered with fuel, whilst in spite
of the grate surface being diminished by one third and the consequent diminished.
expenditure of fuel, which amounts to about one third, the effect of this arrangement.
of furnace, as experiments have shown, is not diminished but increased.
This grate insertion consists of a hollow body or block open below, but otherwise
closed on all sides with the exception of a series of slots formed in the side walls,
and is preferably of domed cross section or roof-shaped, and of a length exactly
corresponding to the length of the grate in which it is built. The width of the
insertion is approximately one third of the whole grate width, and its height is.
about half the height of the furnace chamber calculated from the grate.
As may be seen in the accompanying drawings (in Figure 2), the hollow body
or insertion in the middle of the grate is built in such a way that altogether
only two-thirds of the grate surface receives fuel (i.e. right and left, each.
one-third).
In the accompanying drawings:
Figure 1 is a diagrammatic arrangement of a Cornish boiler with this grate.
insertion A;
Figure 2 is a section on the line y-y of Figure 1, on a larger scale;
Figure 3 shows an elevation of the grate insertion,.
Figure 4 is a section on the line -x of Figure 3 ;
Figure 5 is a longitudinal section; and
Figure 6 a plan view of the grate insertion.
As already mentioned, the grate insertion A, Figure 4. is a hollow body, open.
below, the side walls of which are broken, or rather are provided with a number
of bars s, arranged at equal distances apart, between which slots i remain.
If the grate R be fed with fuel and the latter iguited, in consequence of the
higher temperature resulting in the combustion chamber, cold air will be drawn
from the outside, through the lower open part of the insertion A, and will flow on
both sides through the slots i of the insertion in the direction indicated by the
arrows (Figure 2) into the combustion chamber, simultaneously cooling the
insertion A and being itself warmed.
By the air constantly flowing from both sides through the slots i, the flaines are
forced against the walls of the fire chamber, rise along the walls of the fire

page_text: chamber upwards on both sides, meet in the centre (Figure 2) and there cross,
whilst the smoke gases also arising from the fuel take their course on both sides
along the walls of the fire chamber upwards, and the two currents of smoke gases
cross above in the centre. The unconsumed particles of carbon distributed in the
smole gases are here mainly consumed, owing to the excess of air for combustion,
but partially fall back unconsumed into the glowing fuel on to the grate, so that
the whole of the fuel is ultimately brought into combustion, and the furnace is
itself smokeless, as the products of combustion escaping through the chimney are
free from soot and particles of carbon. The heating effect is so favourably
influenced by the flames being constantly forced by the air current against the
walls of the furnace chamber, that, in spite of the grate surface being diminished
by one third, the action is better than when the whole grate (without an insertion)
is supplied with fuel.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
In furnaces, the arrangement of a hollow, preferably domed or roof-shaped
chamber or insertion (A), open below, and extending the whole length of the
grate, said insertion having side slots (i) through which the air, drawn from the
outside and preliminarily warmed in the interior of the insertion, flows into
the combustion chamber (F), and drives the flames upwards along the walls of the
fire chamber, so that by the crossing of the smoke and combustion gases divided
into two currents directed in opposite directions, a thorough combustion and
increased heating effect is produced, the particles of carbon being partly
consumed, and partly falling back on to the glowing fuel on the grate, substantially
as hereinbefore set forth.
Dated this 15th dor of Decembar 1806
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Agents for the Applicants..