IMPROVEMENTS IN BURNING LIME, AND IN KILNS OR OVENS EMPLOYED THEREIN
Year: 1876

page_text: LETTERS PATENT to Herbert John Walduck, of Manchester, in the County
of Lancaster, Metal Broker, for the Invention of "IMPROVEMENTS IN BURNING
LIME, AND IN KILNS OR OVENS EMPLOYED THEREIN.”
Sealed the 11th August 1876, and dated the 26th February 1876.
PROVISIONAL SPECIFICATION left by the said Herbert John Walduck at
the Office of the Commissioners of Patents on the 26th February 1876.
HERBERT JOHN WALDUCK, of Manchester, in the County of Lancaster, Metal
Broker. "IMPROVEMENTS IN BURNING LIME, AND IN KILNS OR OVENS EMPLOYED
THEREIN."
In burning lime it has heretofore been customary to place successive layers of
fuel and limestone in a kiln and then to ignite the fuel which burns the lime;
now my Invention consists in burning lime by the ignition of inflammable gas.
In performing my Invention I erect a gas retort or other apparatus for generating
inflammable gas from coal or other material, and I convey the gas from the retort
or other apparatus to the lower end of a vertical or diagonal kiln or oven, in
which the lime is placed. When the lime at the bottom of the kiln or oven has
been sufficiently burnt it is raked as usual, and a fresh supply of unburnt lime is
fed in at the top of the kiln or oven; the operation may thus be kept up
uninterruptedly.
A vertical kiln of the ordinary shape may be used, the gas being admitted at
the sides through tuyeres or suitable openings; or I employ an oven with an
inclined floor to admit of the limestone being fed at the higher side and drawn when
burnt through an aperture at the lower side, to which it will tend by gravitation.
。 SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Herbert John Walduck in the Great Seal Patent Office on the
25th August 1876.
HERBERT JOHN WALDUCK, of Manchester, in the County of Lancaster, Metal
Broker. "IMPROVEMENTS IN BURNING LIME, AND IN KILNS OR OVENS EMPLOYED
5 THEREIN.
"

page_text: In burning lime it has heretoforo been customary to place successive layers of
fuel and limestone in a kiln and then to ignite the fuel which burns the lime;
now my Invention consists in burning lime by the ignition of inflammable gas, and
in an improved kiln or oven for effecting the same.
And in order that my Invention may be more fully understood, I will proceed
to describe the accompanying Sheet of Drawings, in which Fig. 1 is an elevation
in section of an ordinary vertical limekiln to which my improvements are applied;
and Fig. 2 is a sectional elevation, and Fig. 3 a side view of a kiln or oven for
burning lime constructed according to my Invention.
In Fig. 1, a, a, are a series of openings at the lower end of the kiln, and into
these openings I convey streams of inflammable gas; this gas is generated in a
furnace or by any other suitable apparatus in the ordinary manner, and when
ignited the flames penetrate through the mass of limestone in the kiln and calcine
it in the same way as the coal or other fuel now generally employed. When the
lime at the bottom of the kiln has been sufficiently burnt or calcined it is raked
through a side door as usual, and a fresh supply of unburnt lime is fed in at
the top.
The improved kiln or oven shewn in Figs. 2 and 3 consists of an inclined floor b
with an arched roof c; the unburnt lime is delivered on to the platform d, and is
spread on the floor b through the openings e, which are closed by the doors f; these
doors are opened and closed by the levers g or in any other convenient manner.
The discharge openings are provided with doors i, which are also opened and
closed by levers or otherwise.
The inflammable gas is supplied to the arched passages j, k, to heat the floor b
from underneath, and it then enters one end of the kiln or oven at 1, 1, and after
passing over the lime on the floor b it escapes into the flue m. When the lime is
sufficiently burnt or calcined it is raked through the openings h, and a fresh supply
of unburnt lime is fed in through the openings e, the inclination of the floors b
facilitating by gravitation the discharge and the feed.
Having thus stated the nature of my Invention, and described the manner of
performing the same, I wish it to be understood that I do not intend to limit
myself to the details given, as my Invention may be applied to every description
of limekiln now in use, the peculiar arrangement of the passages for the admission
of the inflammable gas depending upon the construction of the kiln. I claim,-
First. The use of inflammable gas instead of coal or other fuel in burning lime.
And, secondly. The improved kiln or oven shewn and described in reference
to Figs. 2 and 3 for burning lime by inflammable gas, or any modification of the
same.
In witness whereof, I, the said Herbert John Walduck, have hereto set my
hand and seal, this Twenty-second day of August One thousand eight
hundred and seventy-six.
H.. J. WALDUCK. (L.S.)