Improved Apparatus for Drying Cement, Clay, and other Materials for Burning or Calcining.
Year: 1891

page_text: Date of Application, 13th June, 1891-Accepted, 18th July, 1891
COMPLETE SPECIFICATION.
Improved Apparatus for Drying Cement, Clay, and other Materials
for Burning or Calcining.
I, AUGUST SCHÖFER, Managing Director of Cement Works Lägersdorf,
Holstein in the Empire of Germany 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 :---
This invention consists in a construction or apparatus hereinafter described
intended to be used for the continuous or uninterrupted drying of cement, clay and
the like matters which are afterwards to be burnt or calcined. The construction
or apparatus consists essentially of a tower of appropriate shape in which is a con-
tinuous or endless lifting device or "paternoster" upon which the matter to be
dried is suspended upon trays or holders, to which tower also heat is applied by
heated gases ascending within it in such a manner as to play around or about
those trays or holders which have received a preliminary heating in the said tower
and in such a manner also that the gases which have taken up or extracted the
moisture from the matters drying, are carried away thus providing for continuous
working of the apparatus and preventing the moist gases from coming into contact
with the fully dried matters.
The construction by which this is obtained is shown in the annexed drawing in
which
Fig. 1 is a longitudinal section through the tower and a furnace for supplying
heated gases to the same.
Fig. 2 is a horizontal section of the tower.
The tower comprises the two spaces or chambers A A' formed or bounded by
the outer walls of the tower and by the central upright partition m which divides
the one space A from the other A'. The spaces A. A¹ unite at the upper end
over the upper edge of the partition m and lead into the outlet e so that this outlet
serves equally both the spaces A A¹. At the lower end of the tower, on that side
on which the space (A) in which the matters are to be fully dried is situated, is an
inlet communicating with a fire-grate d or any other source of heat by which
heated air or gases may be supplied to the tower. The partition m terminates at
a suitable distance from the base of the tower, and in the space so left is placed the
chain wheel or drum k. In the space where the chambers A and A' meet above
the partition m is placed a similar chain wheel or drum k¹. Over these drums k k¹
passes a chain or endless ladders, the rising part being in the preliminary
heating chamber A', the falling part in the final heating chamber A. The ladder's
is composed of parallel chains having cross bars i at intervals thereon.
base of the preliminary heating chamber A¹ is the opening H in the wall of the
tower through which the trays or holders y charged with the cement or matter to
be dried may be passed to be suspended upon the rods i by means of hooks such as x.
The charged trays may be brought to the opening H by means of trucks running
on rails o projecting sufficiently within the tower to enable the trays to be con-
veniently hooked onto the rods i as the latter arrive before the opening H. One
of the rotary shafts n n' of the drums k k¹ may be revolved by power to move the
endless ladder in the manner above set forth.
At the
The moist material lifted in the chamber A¹ is heated therein and dried to a
certain extent by the draught of air entering at H and drawn up in the chamber
partly by the movement of the chain and trays, partly by the natural draught or
suction produced by the outlet e partly by the heat of the partition m and of a
proportion of heated gases from the inlet 6 passing under the lower end of the
partition m and rising in the chamber A². The trays carrying the matter thus

page_text: dried to a partial extent, pass over the upper end of the partition m into the
chamber A in which the main body of heated gases from the inlet b ascends to issue
from the outlet e.. The trays descending in, the chamber A, meet.. gases of
increasing dryness as they pass through the chamber A. The trays carrying the
dried matter eventually therefore arrive at the opening Hwhere they are removed
and replaced by others carrying moist matter..
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
An apparatus or construction for the drying of cement, clay and other matters to
be burnt or calcined, consisting of a tower having two upright chambers A A¹ con-
nected above and below their dividing partition m, an outlet or outlets é, heated gas
or air inlet below one chamber, and feed opening H in the other chamber, in com-
bination with an endless ladder devices for conveying the matter during the drying
upward in the chamber A' and downward in the chamber A. whereby it is dried in
the manner set forth.
נימ
701
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.