IMPROVEMENTS IN CEMENT KILNS AND OVENS
Year: 1878

page_text: LETTERS PATENT to Robert Andrew Gibbons, of Northfleet, in the County
of Kent, for the Invention of "IMPROVEMENTS IN CEMENT KILNS AND
OVENS."
Sealed the 10th December 1878, and dated the 24th June 1878.
PROVISIONAL SPECIFICATION left by the said Robert Andrew Gibbons at
the Office of the Commissioners of Patents on the 24th June 1878.
ROBERT ANDREW GIBBONS, of Northfleet, in the County of Kent. " IMPROVE-
MENTS IN CEMENT KILNS AND OVENS."
My Invention relates to a combined arrangement of kilns for burning cement,
and ovens for drying the "slurry" preparatory to its being burnt, in such a manner
that by keeping the kiln continuously working and utilising its waste heat I am
enabled to economise fuel and labour. For this purpose I arrange two or more flue
chambers symmetrically in relation to the kiln in close proximity to it, and forming
passages for the hot gases and products of combustion from the kiln to a common
chimney, or it may be to separate chimneys. The lower part of each of these
chambers is floored over with removable plates, which are preferably of iron, but
which may be tile or other like slabs, the floor forming in each case the cover of the
flue through which the hot gases pass. I also roof over the chamber, and the hot
gases after passing through the lower flue may be made to return along the
chamber between the floor and the roof, this being a convenient arrangement when
it is desired to employ a central chimney or shaft for all the flues. Each of
the said flues and flue chambers is provided with suitable valves or dampers so that
the hot gases may be partially or wholly shut off from one and directed into
another of them.
The operation is conducted as follows:-The kiln being in action its hot gaseous
products are directed into one of the flues, the floor over which has been-by
pumping or otherwise charged with "slurry" which thus becomes dried. When
this charge is dried the hot products of the kiln are shut off from this flue chamber
and directed into another ready charged with "slurry," and while the latter is being
Price Gid1

page_text: dried the dried slurry of the chamber formerly mentioned is stripped and taken to
the upper part of the kiln to be burnt. Thus in succession the several chambers
are charged with slurry and have their contents dried by the waste heat, then
discharged into the kiln, which is kept continuously working, the cement burnt in
it being removed from time to time in quantities taken from the bottom.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Robert Andrew Gibbons in the Great Seal Patent Office on the
23rd December 1878.
ROBERT ANDREW GIBBONS, of Northfleet, in the County of Kent.
MENTS IN CEMENT KILNS AND OVENS."
"IMPROVE-
My Invention relates to a combined arrangement of kilns for burning cement,
and ovens for drying the "slurry" preparatory to its being burnt, in such a manner
that by keeping the kiln continuously working and utilising its waste heat I am
enabled to economise fuel and labour. For this purpose I arrange two or more flue
chambers symmetrically in relation to the kiln in close proximity to it, and forming
passages for the hot gases and products of combustion from the kiln to a common
chimney,, or it may be to separate chimneys. The lower part of each of these
chambers is floored over with removable plates which are preferably of iron, but
which may be tile or other like slabs, the floor forming in each case the cover of the
flue through which the hot gases pass. I also roof over the chamber, and the hot
gases after passing through the lower flue may be made to return along the chamber
between the floor and the roof, this being a convenient arrangement when it is
desired to employ a central chinney or shaft for all the flues. Each of the said
flues and fluc chambers is provided with suitable valves or dampers so that the
hot gases may be partially or wholly shut off from one and directed into another of
theru.
The operation is conducted as follows:-The kiln being in action its hot gaseous
products are directed into one of the flues, the floor over which has been by
pumping or otherwise charged with "slurry" which thus becomes dried. When
this charge is dried, the hot products of the kiln are shut off from this flue chambor
and directed into another ready charged with "slurry," and while the latter is
being dried the dried "slurry" of the chamber formerly mentioned is stripped and
taken to the upper part of the kiln to be burnt. Thus in succession the several
chambers are charged with "slurry" and have their contents dried by the waste
heat, then discharged into the kiln, which is kept continuously working, the
cement burned in it being removed from time to time in quantities taken from the
bottom.
DESCRIPTION OF THE DRAWINGS

page_text: Fig. 3 is a transverse section of the crown of the kiln; and Fig. 4 is a transverse
section through one of the drying chambers.
The kiln A is fed by apertures a, a, in the crown, the baked material being from
time to time removed at the lower part, so that it can be kept continuously
working.
From the crown of the kiln extend drying chambers B, of which two are shewn
in the Drawings, but of which thore may be a greater number arranged radially
froin the centre of A. These chambers can be opened to or shut off from the crown
of the kiln by doors or valves at b, so that the hot products of combustion from the
kiln may be directed into one or other of them or cut off from one or other of
them.
The chambers are provided with floors, of which there may be several at different
levels c³, c², c³, and there are chimneys C near the ends of the chambers, having
openings provided with suitable valves or dampers by which the movement of the
products of combustion over and under the several floors can be regulated.
The floors c¹, c, c³, of one of the chambers B are covered with slurry, and the
valves at b leading into the chamber, and also the valves of the chimney leading
from it being opened, the hot gases from the kiln passing over and under the floors
on their way to the chimney dry the slurry deposited on the floor. While the
contents of one of the chambers B are thus being dried, another of the chambers can
be cut off from the kiln by closing the valves, so that the driod slurry can bo
removed from it and fed into the kiln by the openings a, and fresh slurry can be
run on to its floors to be dried in its turn.
Where there is an intermediate floor, as c², it is made of removeable plates so as
give access to the floor below it.
Having thus described the nature of the said Invention, and in what manner the
same is to be performed, I claim the combination with a cement kiln of one or
more chambers for drying slurry by the passage through them of the hot gases from
the kiln, substantially as hercin described.
In witness whereof, I, the said Robert Andrew Gibbons, have hereunto set
iny hand and seal, this Twenty-first day of December, in the year of our
Lord One thousand eight hundred and seventy-eight.
ROBT. A. GIBBONS. (L.S.)