Improvements in Kilns for Burning Limestone, Cement, and other similar Materials.
Year: 1894

page_text: "
Date of Application, 29th May, 1894
Complete Specification Lelt, 28th Feb., 1895-Accepted, 30th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Kilns for Burning Limestone, Cement, and other
similar Materials.
I JOHN BRIGGS of Bankfield House, Clitheroe in the County of Lancaster,
Lime Burner do hereby declare the nature of this invention to be as follows:-
The present invention has for its object a further improvement in kilns for
burning limestone, cement or other similar materials, of the type for which a
Patent was granted to me in the year 1892, No. 7308. As in this former
construction the kiln is arched over, and shoots or channels for the introduction of
the fuel are arranged, leading from the top-level of the kiln right into the place of
combustion, by which it is gained, that a large quantity of raw stone is always at
hand above the said place of combustion, and the waste heat from this will be
fully utilized by passing up through and between this raw stone, whereby a great
saving in fuel is obtained.
By the arrangement of the arches and fuel-shoots in this present invention, which
will be readily understood on reference to the illustrative drawing hereunto
annexed an improvement is obtained in the uniform and thorough distribution of
the fuel among the stone under calcination.
Figure 1 shows a vertical section across the arches and Figure 2 shows a vertical
sertion parallel to the arches. Figure 3 represents a view from inside the body of
the kiln, looking upward, and showing the entrance of the 10 shoots i, which are
likewise shown and marked in Figures 1 and 2.
It will be seen, that by this arrangement the fuel is very evenly distributed
throughout the burning mass, and further that by the arrangement of the 2 arches,
one on a higher and the other on a lower level, the movement downward of the
stone, caused by the drawing of burnt lime at the bottom of the kiln, will be
deflected first in one direction and then in the opposite direction, thereby a thorough
mixing of the fuel and the stone being effected.
The same principle of arranging arches on different level, and with fuel-shoots
lead ng in under the arches, I will further use in cases where the kiln, instead of
being of circular or square section is of an oblong section, as in such case instead of
only two arches being used, one on a higher and one on a lower level, several.
arches, alternately on a higher and on a lower level can be built across the mouth
of the kiln, dividing the said mouth of the kiln into several receptacles for the raw
stone, and with fuel-shoots distributing the fuel into the place where the calcination
is effected, in a similar manner.
1 dan of 1904

page_text: Improvements in Kilns for Burning Limestone, Cement, and other
similar Materials.
I, JOHN BRIGGS of Bankfield House, Clitheroe in the County of Lancaster,.
Lime Burner, 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 :-
The present invention has for its object a further improvement in kilns, for
burning limestone, cement or other similar materials, of the type for which Letters
Patent were granted to me in the year 1892 No. 7308.
As in this former construction my present kiln is arched over, and shoots or
channels for the introduction of the fuel are arranged leading from the top level of
the kiln direct into the place of combustion or calcination, by which means a large
quantity of raw stone is always at hand above the place of combustion, which
becomes thus dried and heated before entering into the kiln, the waste heat from
which will be fully utilized by passing up through and between this raw stone
whereby a great saving in fuel is effected.
By the novel arrangement of the arches and fuel shoots however in this present
invention an improvement is obtained in the more uniform and thorough
distribution of the fuel among the stone under calcination, as the said fuel is
admitted to the stone at various heights and is deflected in different directions.
The nature of my said improvements and the manner in which the same is to be
performed or carried into practical effect will be readily understood. on reference
to the sheet of illustrative drawings hereunto annexed and the following explanation
thereof.
Fig. 1 on the drawings shows a vertical section of the improved kiln taken
across the arches, and Fig. 2 a vertical section of the same taken parallel to the
arches, and through one of them (at the line A-B on Fig. 1) the form of kiln
shown on these figs. being circular as shown by Fig. 3 which is a horizontal
section of the kiln looking upwards, and showing the entrances of the ten fuel
shoots into the kiln.
a is the combustion or calcining chamber the drying chamber and entrance for
the raw stone. cc are two arches arranged at different heights, and d are the ten
fuel shoots piercing the same.
It will be seen that by this arrangement the fuel is very evenly distributed
throughout the burning mass, and further that by the arrangement of the two
arches, one on a higher and the other on a lower level, the movement, downwards
of the stone caused by the withdrawal of burnt lime at the openings e at the bottom
of the kiln, will be deflected first in one direction and then in the opposite direction,
a thorough mixing of the fuel and the stone being thereby effected.
The same principle of arranging arches at different levels, with fuel shoots
leading into the kiln under and through the arches, is also applicable in cases
where the kilu, instead of being of a round or square section horizontally, is of an
oblong form as shewn in horizontal section at Fig. 4 and in longitudinal and
transverse verti al section at Figs. 5 and 6 respectively.
In this case in-tead of only two arches being used, one on a higher and one on a
lower level, I use several arches c (say for example three on each side) running in
the longitudinal direction at a higher level alternating with (say) two transverse
arches at a lower level built across the mouth of the kiln, and dividing the said
mouth into several receptacles for the raw stone, and with (say) twenty two fuel
shoots d delivering the fuel at the different heights into the combustion chamber a
where the calcination is effected.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what i
claim is :-
The herein before described method of constructing kilns for burning limestone
cement and other similar materials, with two or more arches at different levels.
in combination with fuel shoots for distributing the fuel at different heights
substantially in the manner and for the purposes herein before particularly set.
forth.
Teted this 27th day of February 1895.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.