Improvements in and relating to Drying Apparatus applicable for Use in the Manufacture of Portland Cement and for analogous Purposes.
Year: 1899

page_text: Date of Application, 25th Jan., 1899
Complete Specification Left, 25th Oct., 1899-Accepted, 2nd Dec., 1899
Improvements in and relating to Drying Apparatus applicable for Use
in the Manufacture of Portland Cement and for analogous Purposes.
We, PRESTON DAVIES, of Spencer House, West Hill Road, Southfields, in the
County of Surrey, Engineer, and EDWARD JOHN VAVASOUR EARLE, of 189, Queen
Victoria Street, in the City of London, Gentleman, do hereby declare the nature
of this invention to be as follows:-
Our invention relates to apparatus for drying the "slurry
into "slip" in
the manufacture of Portland cement and for analagous purposes, and it com-
prises the improvements hereinafter indicated.
According to our invention we provide a cylinder of metal or other suitable
material having at each end a hollow spindle or gudgeon. This cylinder is
slung or suspended from pulleys upon a power shaft by cable chains one of
which passes round the gudgeon at either end of the cylinder.
Projecting into one of the said hollow gudgeons is a liquid fuel feeder such,
for example, as that described in the Specification of the Application for Letters
Patent No. 6703 of 1898. The said gudgeon may be lined with refractory
metal so as to form a constricted way or passage and dash brick or firing plate
such as described in the Specification of Application for Letters Patent
No. 14791 of 1898.
Beneath the said cylinder is a trough or bath into which the slurry is pumped
or run and the quantity is such that the cylinder dips into it.
The cylinder is heated internally by the hydrocarbon feeder or other burner
employed, or it might be by an ordinary furnace fire, a pulverized fuel burner,
or by the injection of steam, and there may be wings or radiators projecting
from the interior of the cylinder wall into or towards the zones of greater heat,
and upon the said cylinder being "trundled" by the rotation of the power
shaft it is apparent that a layer of the slurry will adhere to it. This layer of
slurry becomes rapidly dried and at the ensuing revolution of the cylinder
another layer will be licked up. This operation is repeated until a coating of
dried slurry or "slip" adheres to the periphery of the cylinder, whereupon the
supply of slurry is stopped.
Either during the formation of the coating, or after it has been formed,
knives are brought to bear upon it so that it is cut into rings of convenient
width. Next a series of scrapers either successively or simultaneously are
brought into contact with the coating of dried slurry or "slip" which latter
then falls into trucks suitably placed for its reception.
The waste products of combustion escape from the interior of the cylinder
through the second or other gudgeon and in order to assist and quicken the
drying of the coating of slurry on the cylinder, the whole may be enveloped
in an outer jacket into which the products of combustion pass and whence they
are forced or sucked by a fan or blower or otherwise (with the addition of
heated air or the like if necessary),

page_text: The outer jacket may be hinged on one side so as, when required, to fall
inwards and form the scrapers above referred to.
a bath of slurry as
Obviously in lieu of the cylinder being rotated in
described we may drop such slurry upon the top of the cylinder.
Further, the cylinder might be steam or water-jacketted.
By the employment of a slung or trundled cylinder heated internally as
described we obtain the maximum of heated or drying surface and utilize to
the utmost the heat-energy produced.
In some cases we may form the cylinder itself jacketted and allow the pro-
ducts of combustion to circulate through the space thus formed, so confining
the heat more to the periphery of the cylinder. In this case the air which is
admitted for drying the material on the exterior of the cylinder is led through
one of the gudgeons into the axial chamber where it receives the heat and
thence passes to the exterior of the cylinder with the products of combustion.
Dated this 25th day of January 1899.
A. F. SPOONER,
323, High Holborn, London, Agent for the Applicants.
Improvements in and relating to Drying Apparatus applicable for Use
in the Manufacture of Portland Cement and for analogous Purposes,
We, PRESTON DAVIES, of Spencer House, West Hill Road, Southfields, in the
County of Surrey, Engineer, and EDWARD JOHN VAVASOUR EARLE, of 139, Queen
Victoria Street, in the City of London, Gentleman, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be parti-
cularly described and ascertained in and by the following statement :—
"
Our invention relates to apparatus for drying the " slurry into "slip" in
the manufacture of Portland cement and for analagous purposes, and it com-
prises the improvements hereinafter indicated.
In the accompanying drawings we have illustrated two ways in which our
invention may be carried into effect.
Figure 1 is a longitudinal sectional elevation, and
Figure 2 is a transverse section on the line - Figure 1 showing one con-
struction of drying apparatus, and
Figure 3 is a similar view to Figure 1 illustrating a modified construction.
Like letters of reference indicate corresponding parts throughout the draw-
ings.
According to our invention we provide an internally-heated cylinder a of
metal or other suitable material having hollow gudgeons and c. Enveloping
the cylinder a is a casing d which may be made in halves as shown in Figure 2
and bolted or otherwise secured together. The upper half is provided with a
trough-like hopper e into which the slurry is fed by the spout f whilst the
delivery to the surface of the cylinder is regulated by varying the opening g
by the adjustment of the sliding door h.
The cylinder a designed to be rotated and for that purpose it may, as shown
in Figure 1, be swung or suspended from pulleys upon a power shaft (not
shown in the drawings) through endless chains and j, the gudgeons and c
carrying chain wheels and with which the said chains engage; or it may, as
shown in Figure 3, be supported in bearings m and driven by a belt and
pulley n. In the case of Figure 3 both of the gudgeons and c are hollow
but in that of Figure 1 only the one is so constructed.

page_text: In Figure
the cylinder a, together with the hollow gudgeon , is shown as
being lined with refractory material o. Suitably located within the cylinder
is a dash brick or firing plate p carried by supports p. Projecting into the
bollow gudgeons b is a liquid fuel feeder y such, for example, as that described
in the Specification of Letters Patent No. 6703 of 1898, or it might be a pul-
verized fuel or other suitable burner. The gudgeon is lined with refractory
material so as to form a constricted way or passage such as described in the
Specification of Letters Patent No. 14791 of 1898 and the emitted gases or fuel
pass to the interior of the cylinder firing upon the said dash brick or plate p.
After heating the cylinder a the hot gases pass through openings into
the annular space between the cylinder and the outer casing where they
absorb the moisture from the coat of slurry upon the said cylinder and are
thence exhausted from the said casing by a fan or the like through the pipe r.
There may-be-wings or-radiators-projecting-interiorly from the cylinder a into
or towards the zones of greater heat.
In the construction shown in Figure 3 the cylinder a is heated by steam
introduced through the gudgeon whence it is conducted to the chambers from
which the water of condensation is blown out through a pipe t provided at its
end with a thermostatic valve . Dry air enters the cylinder through the
gudgeon and is led to the further end by the tubular extension e, thence led
back in the chamber to the end of the cylinder at which it gained admission
and passes through openings into the annular space between the cylinder a
and the outer casing d where it absorbs the moisture from the coat of slurry
and is finally exhausted by the fan. Instead of employing steam or water, pro-
ducts of combustion may be utilized to heat the jacket and the products of com-
bustion pass into the outer casing through holes in the end of the jacket opposite
to that at which they entered.
The cylinder is rotated in the direction indicated by the arrow in Figure 2
and, as it rotates, the coating of slurry will be rapidly dried into slip being
then scraped off by the scraper w. Thence the slip falls to the bottom of the
casing and through the opening into the receptacle y which is provided
with a spiral conveyor y that delivers it at the point where the produce is
required for further treatment or otherwise.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
1. A drying apparatus comprising an internally-heated cylinder jacketted so
that the products of combustion or heated air pass over the surface of the
material to be dried substantially as set forth.
2. In a drying apparatus an internally heated cylinder slung from a power
shaft substantially as set forth.
3. The drying apparatus constructed substantially as described and illustrated
in the accompanying drawings.
J
1
L
Dal law of Natsbar 1800
A. F. SPOONER,
323, High Holborn, London, Agent for the Applicants.