Improvements in Apparatus for Drying Granular, Pulverulent, and other Substances.
Year: 1888

page_text: Date of Application, 6th Jan., 1888
Complete Specification Left, 4th Oct., 1888
Complete Specification Accepted, 9th Nov., 1888
Improvements in Apparatus for Drying Granular, Pulverulent, and
other Substances.
1, GEORGE FREDERICK REDFERN, of the firm of G. F. Redfern & Co., the General
Patent Office, No. 4 South Street, Finsbury, in the County of Middlesex, Patent
Agents, do hereby declare the nature of this invention (a communication from
abroad by Marc Raty and Emile Lambert, both of Saulnes, in the Republic of
France, Engineers) to be as follows:-
This invention relates to apparatus for drying various substances by the introduction
into the mass of a forced and finely divided current of gas or hot air.
The apparatus comprises a receiver-made of sheet iron and having a double bottom.
The upper compartment receives the substances to be dried and the lower compartment
receives the gas or hot air under pressure serving to dry the said substances.
The gas or hot air is distributed throughout the said substances by means of pipes
closed at their upper ends, open at their lower ends and perforated at their upper
part.
The dried substances are discharged at the lower part of the receiver through
tubes passing through the lower compartment. They can be regularly withdrawn by
means of regulating slides placed at the end of inclined channels discharging into an
archimedean screw.
The introduction of the substances to be dried can be effected continuously at
the upper part of the receiver either by means of a scoop or by means of a regulator
above which is provided a chamber or an archimedean screw fed by a chain of
buckets.
In order to draw off as much of the heat as possible furnished by the gas or hot
air and more particularly to withdraw the products in a cool state the apparatus
can be worked with successive charges. At first hot gas or air is blown in the
apparatus and towards the end of the operation cold gas or air is forced in whereby
the excess of heat is removed and the drying of the upper part of the charge is
completed.

page_text: For working with successive charges and continuously three similar receivers are
placed side by side. Whilst the first of these is cooling and discharging the second
is being charged and the third is drying, the hot gas or air is brought to the apparatus
through a pipe and passes through regulators and short tubes into the receiver; a
similar pipe, regulators and short tubes conduct the cold gas or air into the lower
compartment of the receivers and a self-closing man-hole allows access to the
receivers.
The whole apparatus is enclosed in brick work.
For drying granulated slag for example the gas would be supplied by a blower
and would pass partially or entirely through an ordinary air heating apparatus or
partially or entirely into a fire-place fed with fuel.
1000
G. F. REDFERN & Co.,
.4, South Street, Finsbury, London,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Drying Granular, Pulverulent, and
other Substances.
I, GEORGE FREDERICK REDFERN, of the firm of G. F. Redfern & Co., the General
Patent Office, No. 4, South Street, Finsbury, in the County of Middlesex, Patent
Agents, do hereby declare the nature of this invention (a communication from abroad
by Mare Raty and Emile Lambert, both of Saulnes, in the Republic of France,
Engineers) and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
This invention relates to apparatus for drying various substances by the introduction
into the mass of a forced and finely divided current of gas or hot air.
In order to enable the invention to be fully understood, I will describe how it can
be carried into practice by reference to the accompanying drawing, in which
Figure 1 is a vertical sectional elevation of a drying.apparatus constructed accord-
ing to this invention, the section being taken on the line A B C D E F of
Figure 2 which is a horizontal section on the line I K of figure 3.
Figure 3 is a transverse vertical section on the line G H of figure 2.
Figure 4 is a horizontal section (on line L M of figure 5) of one of the perforated
pipes hereinafter described, and
Figure 5 is a vertical section of the same on line NO of figure 4.
Similar letters in all the figures indicate similar parts.
The apparatus comprises a receiver made of sheet iron and having a double bottom.
The upper compartment receives the substances to be dried and the lower com-
partment Z receives the gas or hot air under pressure serving to dry the said
substances.
The gas or hot air is distributed throughout the said substances by means of
pipes T T T (one of which is shown detached and drawn to an enlarged scale at
figures 4 and 5) closed at their upper ends, open at their lower ends and perforated
at their upper part.
The dried substances are discharged at the lower part of the receiver through
tubes XX passing through the lower compartment Z. They can be regularly with-
drawn by means of regulating slides placed at the end of inclined channels Y Y
discharging into an Archimedean screw Q.
The introduction of the substances to be dried can be effected continuously at the
upper part of the receiver either by means of a scoop or by means of a regulator E E
above which is provided a chamber or an Archimedean screw P fed by a chain of
buckets.
In order to draw off as much of the heat as possible furnished by the gas or hot
air and more particularly to withdraw the products in a cool state the apparatus can
be worked with successive charges. At first hot gas or air is blown in the

page_text: apparatus and towards the end of the operation cold gas or air is forced in whereby
the excess of heat is removed and the drying of the upper part of the charge is
completed.
For working with successive charges and continuously three similar receivers
(1, 2, 3 figure 2) are placed side by side. Whilst the first of these, is cooling and
discharging, the second is being charged and the third is drying.
The hot gas or air is delivered into the apparatus through a pipe a and passes
through regulators S S S and short tubes y y y into the receiver; a similar pipe ẞ,
regulators R R R, and short tubes 888, conduct the cold gas or air into the lower
compartment Z of the receivers, and a self-closing man-hole allows access to the
receivers.
The whole apparatus is enclosed in brickwork.
For drying granulated slag, for example, the gas would be supplied by a blower
and would pass partially or entirely through an ordinary air heating apparatus or
partially or entirely into a fire-place fed with fuel.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what
I claim is
The improved apparatus for drying granular, pulverulent and other substances as
described and illustrated in the accompanying drawing.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.