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Патент USA US2114088

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April 12, 19348.
Filed Sept. 25, 1955 '
Patented Apr. 12, 1938.
Bernhard Sagebarth, Uerdingen/Rhine, Ger
many, assignor to Biittner-Werke Aktienge
sellschaft, Uerdingen/Rhine, Germany, a Ger
man company
Application September 25, 1935, Serial No. 42,113
In Germany October 2, 1934
4 Claims. (Cl. 34-5)
An application for patent has been ?led in Ger
many No. S 115,596, V/82a, on the 2nd October
The present invention relates to a rotary drum
5 drier in which a drum is ?tted internally with
shelving for the purpose of showering the mate
rial which is being passed therethrough in order
that a greater surface area of the material is
presented for treatment by hot' or cool gases
0 which are also passed through the drum.
It is well known that in order to obtain a better
transfer of heat from-?owing ?uids or materials
to the walls of surrounding ducts that the walls
are ?tted with pin-like projections spaced 'short
5 distances apart whereby, without increasing the
speed at which the medium to be treated is to
?ow, a greater amount .of heat will be transferred
from the material to the said walls. The addi
tional amount of heat transferred from the ma
0 terial to the said walls is not, however,‘due solely
to the increased area of the surface presented
_ by the walls and is not, therefore, in direct pro
portion thereto because when the current of air
passing through the drum strikes against the
pin-like projections it is whirled in eddies where
by an intensi?ed contact is attained between the
hot air or gases and the material being treated.
The above principle cannot, however, be ad
vantageously applied to rotary drum driers which
D are ?tted with an internal construction which
causes the material to be showered when the
drum is rotated for the following reason. In the
?rst place, it is necessary to restrict the height
, of the pin-like projections as otherwise they would
5 form cavities or pockets within which the mate
rial would be trapped and its progress through
the drum thereby unduly delayed. On the other
hand, however, it is essential that the pin-like
projections should protrude above the surface
3 of the material in order that the air passing
through the drum-is whirled i'nto eddies.
It is, therefore, the object of the invention to
provide a construction which will enable th':
current of air passing through the drum to be
5 whirled into eddies but which will not at the
same time be subject to the above mentioned dis
to provide-shelving ‘over which the material ‘to
be treated is made to pass in thin layers, the said
shelving having disposed thereon in spaced re
lationship a numberof projecting ?ns which are
positioned substantially transversely to the di
rection of travel of the material through the
drum and which ?ns serve to whirl the dry gases
into eddies.
It has been found that an internal shelvingof
H-shaped section is particularly suitable for. this
purpose, it being understood‘that, in order to
ensure a better heat transfer and a satisfactory
eddying of the air the projecting parts or ?ns
should be arranged, preferably, but not neces
sarily on the outer lateral straight faces of the
?anges of the H-shaped members. It is also pos
sible to arrange the two halves of the ?anges
which meet at the central web at a slight angle
so that the troughs formed between the two
?anges are enlarged or ?ared at their outer ends‘.
It is important that a suitable and favourable
type of shelving should be used which, owing to
the arrangement of these members relatively to
one another will ensure a satisfactory showering
of the material under treatment, said material 25
travelling over the approved path and showering
down as many as four times during each revo
lution of the drum.
In this connection, it is further possible to
ensure, by a suitable arrangement of the heat 30
transfer. members or ?ns, an automatic and con
tinuous banking up of the material under treat
ment, ‘which otherwise might travel too rapidly
over the plane faces of the internal shelves, thus
ensuring a greater uniformity of drying in the 35
?nished product and also an increased capacity.
The accompanying drawing shows, diagram
matically and by way of example, one construc
tional form of the present invention.
Fig. 1 is a cross section through a rotary drum
drier provided with internal showering shelving;
Fig. 2 is a longitudinal section through the said
drum drier.
Referring to the drawing:--
Within a rotary drying drum or shell s, H
advantage and hinder unduly the progress of ' shaped distributing members a, which form two
the material through the drum. This object is troughs with their bases disposed end to end, are‘
attained by the present invention in leaving the arranged in such a way in relation to each other
| faces of the drying surface to which the project
that two opposite troughs of adjacent members 50
ing parts are ?tted as plane as possible.
are staggered in regard to each other.
According to this invention a rotary drum for
drying, calcining or cooli;
purposes comprises
posing surfaces of the ?anges b of two adjacent‘
The op- _
distributing members are ?tted over their whole .
a shell and a plurality of, heat transfer mem
width with the heat transfer or eddying members
; bers located within said shell which are shaped , respectively, whereas the troughlike spaces It 55
2,1 14,088
formed by the central web 10 between the ?anges
b oi’ each distributing member would remain,
preferably, free of said eddylng members or pro
jecting parts. The path of the material, which
during one revolution showers down as many as
four times, is shown by the broken lines at c and
d. Outside the regular system viz., in the vicinity
of the drum shell, only in some parts showering
systems of this kind may be obtained, where the
arranged in such a way that they do not interfere
or, at least, not interfere to any extent with the
travel of the material through the free section of
the drum.
I claim:
1. A rotatable heat exchange drum comprisin
a shell, a plurality of shelves arranged in stag
gered rows in said shell and substantially longi
tudinal thereof and projecting ?ns provided on
10 material showers down two or three times only ' said shelves and extending lengthwise in a direc
tion substantially transverse to the axis of the
at each revolution of the drum.
The heat transfer and eddy producing mem
bers are illustrated as the ?ns g projecting angu
larly, preferably at right angles, to the ?ange
15 surfaces of the H members. These ?ns g may be
provided in any suitable manner, however, are ar
ranged to have their longitudinal length extend
ing substantially at right angles to the axis of the
drum _or transverse to the passage therethrough
20 of the material being treated. This arrangement
of the ?ns g is such as to cause the material which
_ passes through the drum to bank up therein in a
shown only
25 members in
be as many
sense only. While the ?ns g are
on certain ‘of the ?anges of the H
Figure 1 of the drawing, there may
of such fins as are desired.
The ?anges or adjacent distributing members
2. A rotary drum, comprising a shell, a plural- ~
ity of members of H cross-section arranged in
staggered relationship within said shell, and an
gularly projecting members arranged on the
?anges of the H-section members and extending
lengthwise at substantially right angles to the ion
gitudinal axis of the drum.
3. A rotary drum as claimed in claim 2, in
which the heat transfer members are arranged
at longitudinal distances along the ?anges of the
H-section members in order to provide continu
ous banking up of the material under treatment.
4. A- rotary drum comprising a shell, a plurality
of members of H cross-section arranged in stag
gered relationship within and substantially paral
may overlap each other as shown at d or they lel to the axis of said shell, projecting heat
transfer ?ns arranged on the ?anges of the H
may just reach each other as shown at c.
section members and extending transversely of
In vorder to ?x or support the distributing mem
bers in- the drum section (in Figure 1, part of the ‘the longitudinal axis of the H members, and
members is shown without any ?xing) either means supporting said H-section members includ
ing a step shaped support extending across the }
step-shaped supports e may be arranged at suit
able intervals or the central webs of the distribut
38 ing elements may be interconnected, or by other
suitable means. These ?xing means should be
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