Improvements in or connected with Stoves, Steam Generator Furnaces, and other Apparatus Directly Heated by the Combustion of Coal or other Fuel.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Stoves, Steam Generator
Furnaces, and other Apparatus Directly Heated by the
Combustion of Coal or other Fuel.
I, JASPER WETTER, Patent Agent, of 433 Strand, in the County of London,
do hereby declare the nature of this invention and in what manner the same may
be performed, as communicated to me from abroad by Hans Boysen, of Eliselund
pr. Kolding and Ole Nissen Sórensen, of Kolding, both in the Kingdom of
Denmark, Manufacturers, to be particularly described and ascertained in and by
the following statement :-
This invention relates to heating apparatus which is adapted to conduct the
fumes and gases of combustion from the top of the fire place back through the fire,
before they are discharged into the chimney flue, in order to consume the
combustible matter contained in the said gases or fumes and to render the furnace
suitable for inferior kinds of fuel. The fumes, after having passed through the
said tube, may be conducted underneath the ash pit, in order to heat the air and
consume any combustible natter contained in the same.
In the following description reference will be made to the accompanying
drawings, of which
Fig. 1 is a vertical section of a stove embodying this invention,
Fig. 2 is a horizontal section along line a-b of Fig. 1.
Fig. 3 is a vertical section of a steam generator embodying this invention.
Fig. 4 a section along line c-d of Fig. 3.
The stove shown by Fig. 1 is constructed in such a way, that the fuel may be
kindled from below through the grate A, and the hind part of the stove contains a
vertical flue B, through which a portion of the smoke produced by lighting the
fuel is carried up to the upper part of the stove, in order to escape into the chimney,
while the remainder of the smoke is being drawn up through the fuel (as far as the
latter will allow a through-draught) and escapes likewise through the opening of
the valve C to the chimney. After the fire has been started, this extra flue B
serves to furnish the smoke with heated, atmospheric air, which is necessary to the
complete consumption of the smoke arising from the fuel.
When the fire in the grate has been sufficiently developed, the valve C, which
controls the direct communication between the fireplace and the chimney flue, is
shut, and the products of combustion in the upper part of the fireplace have now
no other outlet, than down through the vertical fireproof tube D, which extends
through the ash pit and terminates above the plate Q. The gases then travel
forward between the ash pit and the plate Q, subsequently through the return
flue Fand the shaft G, to the chimney. The said fireproof tube D, being led
through the fire burning in the grate, soon becomes red hot, and therefore serves to
consume the smoke and combustible gases passing through the same.
When a superior kind of coal only is burnt in the furnace, the flue B may be
dispensed with, as in this case the fuel may be kindled from above, and the air,
which is necessary for the consumption of the smoke, is conducted through a small
valve opening in the door or lid H, which covers the feed opening for the coals.
The quantity of air admitted for the combustion of the fuel, should, of course, be
well regulated, as an excess or a deficiency of air would interfere with the proper
working of the stove or the consumption of smoke.
The tube D, which constitutes the principal feature of this invention, may have
any suitable shape and size, and instead of one, two or more parallel tubes may be
used for conducting the fumes or gaseous products of combustion through the
burning fuel.
In Fig. 3, which indicates the application of the invention to a horizontal steam

page_text: generator furnace provided with an internal flue L, the smoke tube D is mainly
horizontal and has its inlet near the discharge end of the smoke flue L, so that the
gases are first led through the said tube to the front of the smoke flue, then down-
ward through the burning fuel and again forward through a horizontal portion of
the tube situated near the bottom of the boiler shell, after which they pass up into
the chimney. The damper or. valve C, which controls the direct communication
between the smoke flue and the chimney, has the same function, as in Fig. 1. That
is to say, for lighting the fuel on the grate A, the damper C is left open, as shown
by the drawing, so that the gases of combustion may pass directly into the chimney,
but when the fire has been lighted, the damper is closed, so that the fumes must
pass through the fireproof smoke tube D, thence through the fire, and finally
through the canal G.
In a similar manner, the principle of a smoke consuming return tube may be
applied to vertical boilers and to other kinds of heating apparatus.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. A stove, steam generator furnace, or other apparatus for burning coal or other
fuel, having a fireproof tube or tubes, adapted to lead the fumes or gaseous products
of combustion (ascending from the fire) down through the fire and then into the
chimney flue, substantially as described and for the purposes specified.
2. A stove or other apparatus for burning coal and other fuel, having a fireproof
smoke consuming pipe or pipes extending downward through the burning fuel and
through the ash pit, into a canal communicating with the chimney, and an extra air
or smoke flue, substantially as described and for the purpose specified.
3. A stove constructed and adapted to operate substantially as described with
reference to Fig. 1.
Dated this 27th day of April 1893.
FAIRFAX & WETTER,
433, Strand, London, Agents.