AN IMPROVEMENT IN FURNACES FOR BURNING SMALL, OR MOIST FUEL
Year: 1884

page_text: I, CHARLES DENTON ABEL of N° 28 Southampton Buildings, Chancery Lane in
the County of Middlesex Consulting Engineer and Patent Agent, do hereby declare
the nature of the said Invention for "AN IMPROVEMENT IN FURNACES FOR BURNING
SMALL, OR MOIST FUEL " and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:-
In the Specification to Letters Patent granted to Alexis-Godillot on the 2nd May
1878 N° 1769 were described pyramidal, conical or pavilion-shaped firegrates for
burning dry or damp small fuel, and in the Specification to Letters Patent granted
to C. D. Abel on the 3rd Sept. 1881 N° 3839 for an Invention communicated to
him by the said A. Godillot, were described certain modifications in the arrange-
ment of such grates.
The present Invention, communicated to me by the said Alexis Godillot, now
called Georges Alexis-Godillot, relates to farther modifications of the construction and
arrangement of fire grates of this kind and of the furnace chambers in which they.
are applied, the object being to secure regular combustion with such ample supply
of air as will give great heating power. I will describe the arrangement for this
purpose referring to the accompanying Drawings. Figs. 1, 2, 3 & 4 are longitudinal
sections shewing furnaces with firegrates of sloped or semi-pyramidal kind modified
in form and position to suit various kinds of fuel with air and flue passages
suitably arranged therefor. Throughout these Figures, the same reference letters
are employed, as far as possible, to indicate similar parts. The furnace chamber A
is separated from the ash-pit C by a horizontal grate B. The ashpit door E is of
such height that when it is opened, access is given to the ashpit under the grate B,
and also to that part of it which is immediately within and under the sloped or
pyramidal grate H. The fuel is fed on to H through an orifice F, which may be
vertical as in Fig. 1 or lateral as in Figs. 2 and 4; it may have a tapering feed tube
extending down from an upper floor; as in Fig. 3, the lower end of the tube being
kept cool by a water casing M; or it may have a hopper I with a rotating feed
screw K, as in Fig. 2. It is of advantage to provide lateral doors, such as G, in
Fig. 1, for giving access to clear the grate B. The products of combustion pass to

page_text: the flue by a direct passage D, as shewn in Fig. 1, or by a contracted and indirect
channel R, ST, as shewn in Figs. 2, 3 and 4, and, preferably, they receive on their
way an additional supply of heated air to complete their combustion, admitted by
numerous small openings o from channels Qformed in the structure of the bridge.
U is a recess or pocket to receive ash or dust deposited from the products of
combustion. The grate H, which may have no openings through it, but is better
to have such openings, is made approximately to the slope which the fuel would
naturally assume in forming a talus, so that the fuel distributes itself uniformly
Even moist
over its surface and slides gradually down, burning as it descends.
fuel may be used, this becoming dry and entering into combustion as it descends
the slope. The ashes, cinders, and unconsumed portions are received on the grate B
which is situated a little below the lower edge of H, so that a rake can, from time
to time, be introduced from the front, to spread the fuel on the grate B, or to clear
off ash and clinkers. The grate H may be made of fire clay or such like refractory
material of half-dome form, as shewn in Fig. 1, perforated with numerous holes, or
it may be of iron, cast in one or in several pieces, as shewn in Figs. 2, 3 and 4.
Having now particularly described and ascertained the nature of this Invention
and in what manner the same is to be performed, I declare that what I claim is
1. In combination with the fire chamber and ashpit of a furnace, a fire grate of
semipyramidal or approximately semipyramidal form, so arranged that fuel fed
at its upper part, descends its slope, while burning, substantially as herein
described..
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.
Dated this 15th day of February 1884.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.