Improvements in Furnaces.
Year: 1892

page_text: Date of Application, 4th June, 1892
Complete Specification Left, 14th July, 1892-Accepted, 20th Aug., 1892
PROVISIONAL SPECIFICATION..
Improvements in Furnaces.
I, EDWARD GRIFFITH BREWER, of 33 Chancery Lane, London, and 30, East
Parade, Leeds, in the County of York, Fellow of the Chartered Institute of Patent
Agents, do hereby declare the nature of this invention to be as follows (which
invention has been communicated to me from abroad by La Societé E. Herrmann
and Cohen, of 42 Boulevard Bonne Nouvelle, Paris, France, Engineers) :-
This invention refers to certain improvements in furnaces, as hereafter described
for burning such materials as green cane-refuse, and also any other damp or very
damp fuel, such as bean or pea stalks.
The
This furnace is composed of fire bars at or near base; of movable grate firebars;
and of a feed hopper. This feed hopper conducts the green cane or other fuel into
the furnace between the bridge and the bars of the movable grate, thus causing it
to travel a considerable distance before entering the heating chamber proper.
result is that the damp fuel is submitted to a quick drying in consequence of the
evaporating action produced by the heat radiated from the furnace on the layer of
fuel which descends. Above the movable fire bars, there is a fixed partition
formed of a series of pipes through which air passes into the furnace after being
previously heated by passing through flues formed in the sides of the furnace. The
air sucked in by means of any suitable fan, placed low; passes under the ash-pit,
ascends by vertical flues situated at the back, up to lateral passages, there to enter
a front chamber, and from thence, guided by the tubes, on to the bed of fuel. This
bed of fuel is then traversed by the hot air, which first dries it and facilitates the
combustion, the gases being directed afterwards into the chimney by flues. To
heat the air to a still greater extent, intended for drying the cane before its arrival.
on the movable grating, there is provided a superheating apparatus in the vertical
flue between the external masonry and inner wall exposed to the fire, and con-
sequently constructed of firebrick. In this wall there are metal plates arranged
zig-zag in such manner that the bricks composing the wall are interposed between
the said plates. These latter terminate at their ends in shoe-pieces placed in the
wall, and which serve as supports for the plates. The parts of the wings being
exposed to the fire, transmit by conduction a certain quantity of heat to the plates
in the vertical flue, which consequently thus acquires a very high temperature, in
such manner that the air arriving by the chamber below traverses the spaces of the
wings in a zig zag direction, becoming greatly heated by their contact, and is
afterwards directed towards the bed of the fuel of the furnace to facilitate com-
bustion. In the lower chamber which traverses the cold air sent by the fan, there
are orifices which can be opened at will in order to send into the lower fire bars a
part of the cold air supplied by the said fan, and this increases the combustion.
Dated this 4th day of June 1892.
BREWER & SON,
Agents.
COMPLETE SPECIFICATION.
Improvements in Furnaces.
I, EDWARD GRIFFITH BREWER, of 33 Chancery Lane, London, and 30 East
Parade, Leeds, in the County of York, Fellow of the Chartered Institute of Patent
Agents, 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
Price 87 1

page_text: '
following statement (which invention has been communicated to me from abroad by
La Societé E. Herrmann & Cohen, of 42 Boulevard Bonne Nouvelle, Paris, France,
Engineers) :-
This invention refers to certain improvements in furnaces as hereafter described
for burning such materials as green cane refuse, and also any other damp fuel, such
as bean or pea stalks and the like. A furnace constructed according to this inven-
tion is shewn in the accompanying drawing.
Fig. 1 is a longitudinal section of the furnace;
Fig. 2 shews a section through the line ab of Fig. 1.
This furnace is composed of fire bars D at or near the base, of movable fire
bars C, and of a feed hopper A. This feed hopper A conducts the green cane or
other fuel into the furnace between the bridge R and the bars C of the movable
grate, thus causing the fuel to travel a considerable distance before entering the
heating chamber proper. The result is that the damp fuel is submitted to a quick
drying in consequence of the evaporating action produced by the heat radiated from
the furnace onto the fuel as it descends.
Above the movable fire bars C, there is a series of pipes B, through which air
passes into the furnace, after having been previously heated by passing through
flues formed in the sides of the furnace.
The air sucked or forced by means of any suitable fan, placed at V for example,
passes, in the direction of the arrows Fig. 1, under the ash pit, ascends by vertical
flues T situated at the back, up to lateral passages S, there to enter a front
chamber J, and from thence, guided by the tubes B, onto the fuel. This fuel is
thus traversed by the hot air, which further dries it and facilitates the combustion,
the gases being directed afterwards into the chimney by flues Z. To heat the air
to a still greater extent, there is provided a superheating apparatus in the vertical
flue T, situated as indicated in Fig. 1, between the external masonry Q and the
inner wall K exposed to the fire, and consequently constructed of firebrick. In
this wall K there are metal plates m m arranged zig zag in such manner that the
bricks composing the wall K are interposed between the said plates. These latter
terminate at their ends in shoe-pieces p, placed in the wall K, and which serve as
supports for the plates m m. The parts m of the wings being exposed to the fire,
transmit by conduction a certain quantity of heat to the plates n in the vertical
flue, which consequently thus acquire a very high temperature, whereby the air
arriving by the chamber H below traverses the spaces between the wings in a
zig-zag direction, becoming greatly heated by contact, and is afterwards directed
towards the fuel to facilitate the combustion as before referred to. In the lower
chamber H through which the cold air passes as sent by the fan from V, there are
orifices L which can be opened at will in order to send through the lower fire
bars Da part of the cold air supplied by the said fan, and this increases the
combustion.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what
claim is :-
1. A furnace particularly applicable for burning green or damp fuel, wherein
the fuel is caused, on entering, to slide down a guiding surface, there exposed to
the rays of heat, and being tbus partially dried, arrives at the front of the furnace
where combustion takes place, air therefor being supplied by mechanical means,
and passed through heating passages around the furnace before being utilized for
the combustion of the said fuel, all constructed and acting substantially as and for
the purposes herein set forth.
2. In furnaces particularly applicable for burning green or damp fuel, the means
or apparatus composed of zig zag wings or plates arranged in a heating passage,
and through which air is mechanically forced or drawn to supply the furnace, the
wings or plates extending through to the furnace and becoming heated by con-
duction, and transmitting the heat to the air substantially as herein described.

page_text: 3. In furnaces particularly applicable for burning green or other damp fuel, the
bridge R of refractory materials which is directly acted upon by the flames of the
fuel, the radiating heat thereof acting on the lower grate and increasing the com-
bustion of the fuel thereon as well as increasing and accumulating the heat of the
whole furnace all substantially as herein described.
4. The general arrangement, construction and combination of parts composing
the herein described improvements in furnaces particularly applicable for burning
green or damp fuel all substantially as set forth with reference to the accompanying
drawings.
BREWER & SON,
Agents.