Improvements in Furnaces.
Year: 1890

page_text: Date of Application, 5th July, 1890-Accepted, 9th Aug. 1890
JUMI LEIP
Improvements in Furnaces.
.
We, LOUIS PHILIPP COHEN, and ERNEST HERRMANN, both of No. 5 Rue de
Chateaudun, Paris, France, Engineers, do hereby declare the nature of our said inven-
tion, and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
Our invention relates to improvements in the furnace patented to us by Letters
Patent, No 8110, dated June 6th 1887, the main features being a novel construction
of the charging hopper for the fuel, the novel construction of the movable grate and
the addition of a slag grate.
In the accompanying drawings, Figure 1 is a vertical section through a furnace,
provided with the improvements, specially adapted for use with coal liable to cake.
Figure 2 is a vertical cross section on the line b, b, in Figure 1,
Figure 3 is a top view of a part of the slag grate,
Figures 4 and 5 represent in section and elevation a system of rollers in connection
with the charging hopper, by means of which a uniform transport of fuel with long
fibre is attained.
Figure 6 is a vertical section of a furnace in which the lower jaw of the mouth-
like part of the furnace is represented in modified forms.
Figures 7 and 8 represent in cross and longitudinal section a device connected to
the charging hopper, by means of which loose fuel, such as tan, chips, shavings, refuse
etc., can be used.
The roof-like air-feeding traverse as described in our Patent No. 8110, 6th June 1887,
is omitted and the lower end of the fuel hopper provided with transverse slots a
running the entire breadth of the furnace and formed by inserting appropriate rails,
so as to not only allow the air to pass freely into the fuel charge, but also to permit
the same being stoked. If caking coal is used the fulcrum of the movable jaw b of
the furnace mouth is located at the lower end, Figure 1, in contradistinction to the
arrangement shown in Patent No. 8110 dated June 6th 1887.
In charging the furnace with a fresh charge of fuel the manipulation is as
follows:-
The lower jaw b of the furnace mouth, Figure 1, is placed in the position indicated
by the dotted lines, so that the coal beneath the jaw b is forced onto the main grate.
If the jaw b is now withdrawn into the position shown in full lines, Figure 1, the coals
which have already commenced to burn will not return to their former position, so
that a hollow space is left in front of the jaw b, which is filled out by the coal falling
out of the charging hopper e. The consumption of fuel can be readily ascertained
from the number of times the jaw b is operated. According to the construction shown
in Figure 1 the upper surface of the jaw b is in the form of a segment, said jaw being
caused to turn on its fulcrum in any desired manner.
If middle class non-caking coal is used, we prefer to give the jaw ba curved or
wedge-like form, as shown in Figure 6, the same being operated as indicated by the
dotted lines. When this jaw b is moved into the position represented by the dotted
lines, Figure 6, the fuel in front of the same will be forced onto the main grate, and
when it is moved back to its original position coal will fall from the charging hopper
and occupy the space left free. "In both furnaces, Figures 1 and 6, the fresh fuel will,
in charging the furnace, always come behind or above the coal already burning or
being gasified, so that the latter is covered in the direction from whence the draft
comes, thus producing a smokeless combustion of the fuel.
For furnaces of the aforedescribed kind, we prefer to utilise a slag grate, which in
arge furnaces, Fig. 6, is arranged at a distance from the main grate, so that a space
s left to allow the insertion of the tools for breaking up and removing the slag. This
...מ

page_text: slag grate is so constructed that only the rear part ƒ¹, Fig. 3, allows ashes to fall
through, whereas the front half f is closed, in order to prevent combustion on this
part of the grate.
In smaller furnaces, Figure 1, the slag grate forms a continuation of the main grate,
which can be lifted a sufficient distance, Figure 1 in dotted lines, to allow the slag to
be removed, after which the main grate is again lowered, or this slag can be removed by
operating the part represented in Fig. 6. In order to render the furnace suited
for burning loose fuel, such as shavings, sawdust, tan, etc., the charging hopper c is
preferably made in the form of a box wider at the lower end, Figs. 4, and 8.
and in which one or more unround shafts or rollers g, Figure 1, are arranged, the
same being held in continuous revolution by means of a suitable driving device.
In this manner the formation of arched-liked spaces which cause stoppages in
the feed are prevented and a regular automatic feed attained. If the fuel employed
possesses long fibre so that it will not readily fall automatically, we arrange a series
of rollers in the charging hopper, Figs. 4 and 5. The hopper is, in this case,
made in the form of a short pyramid, the front and rear walls being perforated to
receive the toothed rollers driven by suitable driving gear.
The half round conical teeth of these rollers press themselves into the fuel
and push the same continuously towards the mouth of the furnace. By altering
the speed, the feed or consumption of the fuel can be regulated.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we desire it to be understood
that we do not confine ourselves to the special form and construction of parts herein
specified, as these can be modified in many ways without departing from the nature
of our said invention, but what we claim and desire to secure by Letters
Patent is :-
t
In furnaces, such as described, shown and claimed in the Letters Patent, No. 8110,
dated 6th June 1887.
1. The construction of the mouth of the furnace in such manner that the rotary
lower jaw bis either in the form of a sector with its fulcrum at the lower end,
Fig. 1, or of highly curved form, and the fulcrum at the upper end, Fig. 6, in
order that the movement of the jaw may cause the fuel to be pressed onto the
main grate and fresh fuel caused to fall from the charging hopper c into the space
formed by the operation of the said jaw, the air feed being formed by flat iron
rails a so as to form slots, through which the stoking irons can be inserted, substantially
as specified, and shown.
2. The modified construction of the slag grate f, f¹, in such manner that the part f¹
is perforated to allow the ashes to fall through, whereas the slag formed can be removed
from the unperforated part by means of the intermediate part, Fig. 6, or by operating
the main grate, Fig. 1, substantially as specified, and shown.
Dated this 5th day of July 1890.
ALLISON BROS.,
Agents for the Applicants.