Improvements in Furnaces.
Year: 1893

page_text: Date of Application, 12th May, 1893
Complete Specification Left, 10th July, 1893-Accepted, 2nd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Furnaces.
We VICTOR CLement Fouque of 30 Rue Cavé Levallois, Perret pres Paris,
and JOSEPH POLIN of 54 Rue de la Fédération, Paris, both in the Republic of
France, do hereby declare the nature of this invention to be as follows:-
1
This invention for improvements in furnaces has for its object to ensure a more
perfect combustion of the gaseous products from the furnaces of steam boilers and
the like; and consists essentially in arranging a bridge depending from the top of
the flue slightly behind the ordinary bridge of the furnace to deflect the furnace
gases downwards and in arranging a movable bridge behind the depending bridge to
deflect the gases upwards again, the faces of these bridges being lined with firebrick
or other refractory substance. The movable bridge is secured to rods passing
under the bridge and through the ash pit, and is pulled or pushed bodily forwards
or backwards. Suitable holes situated below the bridge and closed by dampers
are provided to admit and adjust the quantity of air admitted between the
bridges.
Dated this 12th day of Mov 1803
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Furnaces.
We VICTOR CLEMENT FOUQUE, of 30 Rue Cavé Levallois, Perret pres Paris,
and JOSEPH POLIN of 54 Rue de la Fédération, Paris, both in the Republic of
France, 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 for improvements in furnaces has for its object to ensure a more
perfect combustion of the gaseous products from the furnaces of steam boilers and
the like; and consists essentially in arranging a bridge depending from the top of
the flue slightly behind the ordinary bridge of the furnace to deflect the furnace
gases downwards, and in arranging a movable bridge behind the depending bridge
to deflect the gases upwards again, the faces of these bridges being lined with fire-
brick or other refractory substance. The movable bridge is secured to rods
passing under the bridge and through the ash pit and is pulled or pushed forwards
or backwards. Suitable holes situated below the bridge and closed by dampers
are provided to admit and adjust the quantity of air admitted between the
bridges.
Figures 1, 2, 3, of the annexed drawing show respectively a vertical section
along the axis, a plan, and an end view of our arrangement as adapted for an
inside furnace.
Figure 4 shows a vertical section along the axis of the same arrangement
applied to the furnace of a locomotive boiler.
The bridge portion A is preferably of cast iron protected on its upper side by a
thick covering of a refractory substance forming part of the grate. It may be
connected by arms a, a to the bridge B, or may be distinct therefrom. In the same
manner the latter may, as also the bridge piece C, be composed of a metallic basis
covered with a thick slab of fire clay. The metallic bases of the bridge pieces B C
Pl

page_text: may be provided with projections s. Finally the pieces B C or one of them, and
especially B, may consist of a fireproof block without a metallic support.
The pieces A B are fixed. The piece C is movable either in a straight line
(Figures 1, 2, 3) or in a circular manner (Figure 4).
The movement of the portion C has for its object the regulation of the draught
according to the condition of the grate and the necessity of the work. A stopper D
at the bottom allows the removal of ashes and cinders and also, when necessary, the
passage of a certain quantity of air.
The movement of the adjustable piece C is effected from the front of the furnace
by means of levers or rods, the lower one of which passes through the ash box.
When the piece C is adjustable by its rotation about the axis F there is
established, between this axis and the surface of the piece A, a passage sufficient to
allow small pieces of coal, which might pass over the grate bridge, to clear it and
fall into the ash pan from which they can be easily removed.
In the case of Figure 4, the piece B which touches both the roof and the side
surfaces of the furnace, is supported by bolts or bars which pass through hollow
stays to these surfaces and rest in corresponding holes made in the piece.
The refractory part of the pieces A, B, C, concentrates the heat of the furnace,
the temperature is there clevated so that if any portion of the gas passing from the
grate is combustible it is inflamed on contact with, or in the neighbourhood of, the
refractory pieces, being thoroughly mixed with an excess of air; thus giving rise
to more perfect combustion, effected at a higher temperature and without producing
much smoke.
The height of the bridge may vary according to the requirements of the work on
the grate, and the section of the passages existing between the extremities of the
three pieces mentioned should be always somewhat larger than that of the total
sectional area of the tubes in the case of a tubular boiler. This condition however
is not indispensable. It is enough to have in all cases a sufficient draught.
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 :-
1. In the interior furnaces of steam boilers: the combination of three distinct
parts or bridge pieces A B C, of thick refractory substance, arranged substantially
as described and for the purpose specified.
2. In the interior furnaces of steam boilers: the employment in combination with
the bridge pieces A, B, of a bridge-piece C adjustable by a rectilinear or circular
movement and operated substantially as described.
3. The arrangement and construction of furnaces substantially as described with
reference to the drawings.
Deted this 10th day of July 1893
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.