Lime and similar Materials.
Year: 1885

page_text: Lime and similar Materials.
I, PHILIP MIDDLETON JUSTICE of 55 and 56 Chancery Lane, in the County
of Middlesex, Fellow of the Institute of Patent Agents do hereby declare the
nature of this invention (a communication to me from abroad by Carl Dietzsch of
Malstatt in the Empire of Germany Cement manufacturer) and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
This invention relates to an improved process for burning or firing limestone or
lime and similar substances that are fired while in contact with fuel, as also to an
improved form of furnace by which said process can be carried into effect. The
furnace is built and worked on a somewhat similar plan to those employed in
burning cement and as shown and described in the specification of Letters Patent-
No. 14,324 of 1884 without however necessitating the employment of all of the
arrangements therein set forth for the purpose of freeing the furnace walls from
the substances adhering to them.
To clearly explain the nature of the invention reference is made to the
accompanying drawings in which
Fig. 1 is a side sectional elevation of a double furnace.
Fig. 2 is a plan of same on the lines x-x, x-x.
Fig. 3 is an end view partly in section.
Fig. 4 is a plan of same.
Fig. 5 is an end view partly in section of a single furnace.
Fig. 6 is a plan of same on the line y-y.
Fig. 7 is a side sectional elevation of said furnace and
Fig. 8 is a plan of same on line z―z.
The furnace has a chamber A in its upper part, in which the charge is heated
by the gases passing up from the lower firing chamber preparatory to the final
burning of the mass. This chamber A is connected by the inclined shoots or
channels B with one two or more firing chambers C the lower parts D of which
are contracted into a funnel shape towards the bottom and form the cooling

page_text: portion or zone of the main chamber. Beneath this is the aperture R through
which the charge is extracted after firing. This aperture is closed by a door T
in which are formed adjustable openings by which the supply of air the furnace
is regulated, said air serving to cool the mass in the lower portion D of the
chamber, and to promote the combustion of the mass in the upper portion.
The fuel to maintain the combustion is passed in through the openings E which
at the same time give access to the channel B for the purpose of clearing it and
of raking down the heated charge from the preparatory heating chamber A into
the burning chamber C in which it is spread out in alternate layers with the fuel.
Through the apertures F which are closed during the firing, the furnace can be
reached for the purpose of raking or clearing away any obstruction or caked
material. The shape of the burning and cooling chambers is shown as oval but
they may be round, oblong or of other suitable shape. The chamber A in the
single furnace represented in Figs. 7 and 8 is shown as being contracted towards
the bottom and this allows of the opening F being placed above the burning
chamber C for clearing purposes. The furnace is charged through the opening H
in the upper portion or stack K.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed as communicated to
me by my foreign correspondent I declare that what I claim is
1st The improved process of burning limestone or lime or similar substances
which consists in first heating it by means of the escaping heat from the furnace
then adding fuel to the heated mass as it sinks down into the burning chamber and
then cooling or partially cooling the same before withdrawing it all substantially as
described.
2nd In a furnace for burning limestone or lime and similar substances the com-
bination of the preliminary heating chamber the shoot B having openings E and F,
the burning and cooling chambers the latter being contracted at its lower end and
provided with regulating draft devices all substantially as shown and described
and for the purpose set forth.