Year: 1896

page_text: Date of Application, 1st Sept., 1896
Complete Specification Left, 1st June, 1897-Accepted, 3rd July, 1897
I, THOMAS ROBINSON of Beaconsfield, Hough Green, near Widnes, in the County
of Lancaster, Ironfounder, do hereby declare the nature of this invention to be as
follows:-
The object of this Invention is to obviate the loss-of hent or fuel which occurs in
Cupola Furnaces, as at present constructed and operated, by reason of the formation
and escape of carbonic oxide, into the atmosphere.
For this purpose I form the upper part of the Cupola, at, or about, and above the point
where the charge becomes incandescent, narrower than the lower part or hearth of such
cupola, and I blow or induce a flow of air heated or otherwise into the cupola through
an opening or openings at a point where the charge is sufficiently hot to ignite
carbonic oxide in the presence of air. I prefer to admit the air at or about the point
where the upper part of the cupola cominences to widen downwards towards the
hearth. By the above means any carbonic oxide formed in the lower part of the
cupola is burnt into carbonic acid at the point where the secondary supply of air is
admitted and the resulting increase of temperature of the gases heats up the super-
incumbent charge in the cupola to such an extent as to reduce considerably the
quantity of fuel required to completely melt the charge.
I THOMAS ROBINSON of "Beaconsfield" Hough Green, near Widnes, in the County
of Lancaster, Ironfounder, 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 :-
The object of this invention is to obviate the loss of heat or fuel which occurs in
cupola furnaces as at preseut constructed and operated by reason of the formation
and escape of carbonic oxide into the atmosphere.
For this purpose I form the upper part of the cupola at or about and above the
point where the charge becomes incandescent, narrower than the lower part or hearth
of such cupola, and I blow or induce a flow of air heated or otherwise into the cupola
through an opening or openings at a point where the charge is sufficiently hot to
iguite carbonic oxide in the presence of air. I prefer to admit the air at or about the
point where the upper part of the cupola commences to widen downwards towards
the hearth.
By the above means any carbonic oxide formed in the lower part of the cupola is
burnt into carbonic acid at the point where the secondary supply of air is admitted
and the resulting increase of temperature of the gases heats up the superincumbent

page_text: charge in the cupola to such an extent as to reduce considerably the quantity of fuel
required to completely melt the charge.
The accompanying drawing is a sectional view illustrative of my invention. a is the
hearth of a cupola formed in any usual way and provided with the usual tuyeres b for
the introduction of the air blast. The upper part of the cupola above the hearth at
about the point where the charge becomes incandescent is narrower than the hearth
as shown at c, and at or about the beginning of the narrower part I provide tuyeres d
through which air can be admitted so as to burn any carbonic oxide which may be
formed in the lower part of the cupola. I prefer to lead the tuyeres from a space d
formed in the brickwork. The air in passing through the space becomes warmed
before entering the tuyeres. The narrowing of the cupola above the hearth ensures
that any carbonic oxide formed in the lower part shall come into contact with the
secondary supply of air through the tuyeres d the resulting products of combustion
passing through and heating up the superincumbent charge in the upper part of the
cupola thus utilizing the heat which would otherwise be lost if the carbonic oxide was
allowed to escape into the atmosphere unburnt. The narrowing of the cupola above
the hearth also ensures that the currents of gases are directed so as to permeate all
parts of the superincumbent charge and not to pass away through one portion.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed I'declare that what I claim is :-
Cupolas with narrowed upper portions and a secondary air supply, heated or
otherwise, substantially as and for the purpose set forth.