provements in or relating to Furnace Grates
Year: 1888

page_text: PROVISIONAL SPECIFICATION
Improvements in or relating to Furnace Grates
1, ALBERT HORACE ROBIN of 1 Boulevard St Denis, Piris, France, Engineer, do
hereby declare the nature of this 'nvention to be is follows
-
For the combustion of small fuel such is powdered coke, anthracite, pent &c, what
is generally called a submerged grate has sometimes been employed the principle of
which is that the fire bars have their buse in a tough filled with water up to a given
level Although satisfactory results have been obtined these submerged grites are
attended with certain objections among which I may mention the following (1) The
difficulty which the air (blown by a in or steam blower) has in spiciding itsolt
equally under the whole grate on account of the slight spice between the bars, and of
the obstruction caused by the large trough of water in which all the bars dip
(2) The necessity for a strong blast to overcome these resistances, and the consequent
drawing of dust and ashes into the flues which have therefore to be frequently
cleaned (3) The necessity for cleansing the trough, opening and closing the manhole,
emptying out the water and clearing out the ashes (4) Very light ashes which pass
between the bars instead of falling to the bottom of the trough suck up the water
by capillarity, stick between the wet bars above the water level and gradually close
the space
Now my invention consists in constructing a submerged grate in such manner that
these objections are overcome With this object I mike the grite-birs of V form
the lower part dipping into a trough which receives the feet or bottom of a whole row
of bars There ire as many troughs is there 11 rows of bus They are connected
together by pipes which communicate with a water reservoir pliced at higher level
and also with discharge pipe or outlet It thus easy by means of a cock to
regulate the flow of the water so as to compensate for the loss by evaporation or even
to increase the supply if desired, the excess being discharged
In this way the witei
in the troughs can always be kept as cool as may be wished Even if it overflowed
the troughs it would do no harm as it would fill into the ashpit

page_text: Each bai his on one side a rib sloping in two directions which maintains the distance
between two adjoining bars and prevents the ashes falling into the troughs It forms
both cup and a stav There may be double sloped ribs on both sides of the bar. but
at different levels so that between adjoining bars there will be covering ribs which
will avoid any communication of the ashes with the troughs notwithstanding any
movement of the bars
The bars may be arranged longitudinally or transversely, the troughs being placed
at right angles thereto

page_text: COMPLETE SPECIFICATION
Improvements in or relating to Furnace Grates
I, ALBERT HOBACE ROBIN of 1 Boulevard St Denis, Paris, France, 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
-
wbat
For the combustion of small fuel such as powdered coke, anthracite, peat &c,
18 generally called a submerged grate has sometimes been employed, the principle of
which is that the fire bars have their base in a trough filled with water up to a given
level Although satisfactory results have been obtained these submerged grates are
attended with certain objections among which I may mention the following (1) The
difficulty which the air (blown by a fan or steam blower) has in spreading itself
equally under the whole grate on account of the slight space between the burs, and of
the obstruction caused by the large trough of water in which all the bars dip (2) The
necessity for a strong blast to overcome these resistances, and the consequent drawing
of dust and ashes into the flues, which have therefore to be frequently cleaned
(3) The necessity for cleansing the trough, opening and closing the manhole, emptying
out the water, and cleaning out the ashes (4) Very light ashes which pass between
the bars instead of falling to the bottom of the trough, suck up the water by
capillarity, stick between the wet bars above the water level, and gradually close the
space
Now my invention consists in constructing a submerged grate in such manner that
these objections are overcome With this object I make the grate bars which are
seen at A A in Figures 1, 2, 3, 4 and 5 of the annexed drawings of ✓ form, or
approximately so, the lower part dipping into a trough B which receives the feet or
bottom of a whole row of bars There are as many troughs as there are rows of bars
They are connected together by pipes C which communicate with water reservoir M
placed at a higher level and also with a discharge pipe or outlet D
It is thus easy
by means of a cock R to regulate the flow of the water so as to compensate for the
loss by evaporation or even to increase the supply if desired, the excess being dis-
charged In this way the water in the troughs can always be kept as cool as may be
wished Even if it overflowed the troughs it would do no harm as it would fall into
the ash pit
Each bar has on one side a rib N sloping in two directions which muntains the
distance between two adjoining bars and prevents the ashes falling into the troughs
It forms both a cap and a stay There may be double sloped ribs on both sides of
the bar, but at different levels as seen at P, Figure 8, so that between adjoining bars
there will be covering ribs which will avoid any communication of the ashes with the
troughs notwithstanding any movement of the bars
With the arrangements above described, ashes are not liable to stick to the sides
of the bars so that the spaces between the bars will not get obstructed The ashes
tall into the ash pit and can be removed therefrom as usual Further, the air has no

page_text: difficulty in spreading freely under the whole surface of the grate and consequently
there is regular combustion at all parts The blast need not be strong and dust is
therefore not liable to be drawn into the flues In cases where the furnaces are not
required at night the lighting up in the morning when no steam is available for the
blast is easily effected by simply opening the ash-pit doors
The removal and replacement of the bars can be readily and quickly effected
without removing the bars by simply disengaging them from their side supports S
The invention can be applied to various kinds of furnaces Figures 1 and 2 show
its application to one kind and Figures 3 and 4 to another kind The height of the
bars will vary according to the particular kind of furnace and their distance according
to the nature of the fuel to be burnt The invention can also be applied to furnaces
for burning fuel in lumps or nuts, without a blast, by sufficiently increasing the spaces
between the bars
Figures 6 and 7 show two suitable forms of bars
The bars may be arranged longitudinally as seen in Figures 1 to 4 or transversely
as shown in Figure 5, the troughs being placed at right angles thereto
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same 19 to be performed I declare that what I'
claim is -
In a submerged furnace grate the combination with rows of bars substantially of
the form described of troughs, one for each row, through which a flow of water
is muntained, the said bars having ribs on one or both sides, as and for the purposes
set forth