IMPROVEMENTS IN FURNACES FOR CALCINING OR BURNING CEMENT
Year: 1883

page_text: LETTERS PATENT to Philip Middleton Justice of Chancery Lane in the
County of Middlesex Fellow of the Institute of Patent Agents for an
Invention of *IMPROVEMENTS IN FURNACES FOR CALCINING OR BURNING
CEMENT communicated to him from abroad by Carl Dietzsch of Malstatt in
the Empire of Germany
"
PROVISIONAL SPECIFICATION left by the said Philip Middleton Justice
at the Office of the Commissioners of Patents on the 28th March 1883.
PHILIP MIDDLETON JUSTICE of Chancery Lane in the County of Middlesex
Fellow of the Institute of Patent Agents IMPROVEMENTS IN FURNACES FOR
CALCINING OR BURNING CEMENT A communication to me from abroad by Carl
Dietasch of Malstatt in the Empire of Germany
This Invention relates to that class of furnaces employed for the calcining or
burning of cement
The furnace according to this invention is made with a withdrawing or cooling
chamber, a calcining or burning chamber and a heating chamber the two latter
being placed in different vertical planes and connected by a neck The with-
drawing chamber is provided with suitable apertures for the removal of the burnt
material which is cooled therein by air supplied under pressure or not which takes
up a portion of the heat of the mass and ascends to the burning chamber, said
burning chamber is provided with a suitable fuel or feed opening from without and
is also supplied with the material to be burnt from the heating chamber through
the before referred to neck which in its turn is supplied with suitable doors or
openings. The heating chamber is filled from above and in it is placed only the
material to be burnt which is heated by the fire and gases from the calcining or
burning chamber passing through the mass
When the heat in the calcining or burning chamber is reduced (which will
ordinarily be once in every one or two hours) the cooling chamber is so far emptied
hat it can receive at the top the contents of the calcining chamber which in its
urn is supplied with fresh material from the heating chamber and with thin

page_text: intermediate layers of fuel from the feed door or opening The top of the heating
chamber may be open to the atmosphere or may be connected with a chimney or
the heat may be collected and used for any of the purposes for which such arrange-
ments are now employed
A series of calcining or burning chambers may be placed around one heating
chamber if a large output is desired The arrangements before described are
particularly adapted for the calcination or burning of Portland Cement which is
soft when under heat and disposed to form in lumps and become fused to the
furnace walls This agglomeration occurs more easily if the burning and melting
zone is covered and weighted by superposed materials
In order to obviate this drawback the burning chamber of the furnace is con-
structed so as to be free at the upper part and is accessible through the fuel
aperture for the use of iron bars or other tools. For the same reason the lower
part of the calcining chamber is widened out and the cooling chamber is made
even wider than the burning chamber so that the soft material may fall down
without becoming caked to the walls Further the material when the heat is
greatest is not covered over by heavy layers of material as the heating chamber
being in a different vertical plane its contained material does not press down on
the soft glowing cement and yet it receives the full benefit of the escaping fire and
gases

page_text: further sectional elevation and
Figure 8 a plan section on the line m. n. Fig 7
The furnace according to this invention is made with a withdrawing or cooling
chamber A, a calcining or burning chamber B and a heating chamber C the two
latter being placed in different vertical planes and connected by a neck D The
withdrawing chamber A is provided with suitable apertures for the removal of the
burnt material which is cooled therein by air supplied under pressure or not
which takes up a portion of the heat of the mass and ascends to the burning
chamber B said burning chamber is provided with a suitable fuel or feed opening F
from without and is also supplied with the material. to be burnt from the heating
chamber C through the before referred to neck D which in its turn is supplied
with suitable doors or openings H The heating chamber C is filled from above
and in it is placed only the material to be burnt which is heated by the fire and
gases from the calcining or burning chamber B passing through the mass When
the heat in the calcining or burning chamber B is reduced (which will ordinarily
be once in every one or two hours, or in even less time depending upon the
material treated) the cooling chamber A is so far emptied that it can receive at the
top, the contents of the calcining chamber B which in its turn is supplied with
fresh material from the heating chamber C and with thin intermediate layers of
fuel from the feed door or opening F The top of the heating chamber may be
open to the atmosphere as at j or may be connected with a chimney as shown in
Fig 7 or the heat may be collected and used for any of the purposes for which such
arrangements are now employed or for drying material placed upon the top of
shallow channels K such material being subsequently fed into the heating
chamber C through openings L j. A series of calcining or burning chambers may
be placed around one heating chamber if a large out put is desired or conversely
a large single burning chamber may be supplied from two or more heating
chambers as represented in Fig 4 The arrangements before described are parti-
cularly adapted for the calcination or burning of Portland cement or other sub-
stances which are soft when under heat and disposed to form in lumps and become
fused to the furnace walls. This agglomeration occurs more easily if the burning
and melting zone is covered and weighted by superposed materials as in the

page_text: ordinary shaft furnace In order to obviate this drawback, the burning chamber
of the furnace is constructed so as to be free at the upper part and is accessible
through the apertures E. F. G & H for the use of iron bars or other cleaning or
loosening tools
For the same reason the lower part of the calcining chamber B is widened out
and the cooling chamber A is made even wider than the burning chamber so that
the soft material may fall down without becoming caked to the walls Further
the material when the heat is greatest is not covered over, by heavy layers of
material as the heating chamber C being in a different vertical plane its contained
material does not press down on the soft glowing cement and yet it receives the
full benefit of the escaping fire and gases Should the material from the heating
chamber C become clogged or stick in the neck D it may be pushed forward to the
top of the burning chamber B by pushers inserted through the openings E As the
fuel is only fed into the burning chamber and there comes in contact with the
already glowing material it is thoroughly decomposed and the resulting heat is
fully utilized here and in the heating chamber. Having thus described the nature of
the invention as communicated to me by my foreign correspondent and how the
same may be practically employed What I claim and desire to secure by Letters
Patent is
The improvements in furnaces for calcining or burning cement substan-
tially as hereinbefore described and as illustrated in the accompanying
drawings
In Witness whereof I the said Philip Middleton Justice have hereunto set my
hand and seal this twenty seventh day of September in the year of Our Lord one
thousand eight hundred and eighty three
Signed, sealed and delivered
in the presence of
ALLEN PARRY JONES
55 & 56 Chancery Lane
London W.C.
PHILIP M. JUSTICE (L.S.)