Improvements in Smelting Furnaces.
Year: 1889

page_text: Date of Application, 28th Nov., 1889-Accepted, 4th Jan., 1890
COMPLETE SPECIFICATION.
Improvements in Smelting Furnaces.
1, FRIEDRICH AUgust Herbertz, of Cologne on the Rhine, Germany Manu-
facturer 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 :-
My present invention will be best understood by describing same with reference to
the accompanying drawings, Figure 1 of which is a longitudinal vertical section,
and Figure 2 is a horizontal section of a smelting furnace constructed according to
my invention.
S is the shaft of a smelting furnace supported by three standards a and provided
with steam jet; H shews the adjustable hearth of the furnace. Between the shaft
and the hearth is an adjustable annular air entrance opening O.
At the upper end of the shaft. S is an outward suction by means of a steam jet
through the steam blast nozzle d and the suction pipe C, the latter being in con-
nection either with an iron or a masonry chimney. The charge of the furnace is
closed in by the funnel t and by the bell-cover g. The charging of the furnace
is effected by putting in the raw materials through the funnel and the bell-
covering g by lifting and sinking the bell-cover.
The steam-jet through the blast-pipe d produces a vacuum in the shaft C of the
furnace which causes the outer atmospheric air to enter through the annular
opening into the furnace, and the combustion of the fuel and the process of
smelting is thus effected.
Now when smelting finely granulated or pulverized materials it is hardly possible
for the steam jet to create such a vacuum and draw the air through the thick
layers of the charge in the furnace as to secure intense combustion and in such
circumstances it is necessary to force in the outer atmospheric air through the
annular opening.
For this purpose air is forced in through both the channels Z into the air
chamber which runs round the outside of the smelting box of the furnace. The
air passes therefrom through a number of connection pipes into the adjustable
annular air-case W which lies round the adjustable annular air opening O and
passes through the latter into the furnace.
In order to be able to regulate the air passage O as required, it is necessary that
the annular air case W should be adjustable. For this purpose the said air-case W
is formed of two parts, one part of which is secured to the shaft S and the other
part to the hearth H.
r of the
The two parts of the circular air case W are so far connected that the outer
casing V of the upper part enters into the inner channel of the ring r of the under
part and the said inner channel is packed with sand. If then the hearth H is screwed
higher or lower by means of the screw gear i, the channel formed ring
under part of the air channel W is carried with it, and the annular air
opening O is thereby proportionately diminished or increased and less or more air is
thereby admitted to the furnace either whilst the furnace is in operation or
otherwise.

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 :―
In smelting furnaces, the adjustable annular air-entrance opening O in combination
with a separable and adjustable annular air case W all substantially as described and
illustrated with reference to. the accompanying drawings.
Dated this 28th day of November 1889.
F. A. HERBERTZ,
By Brewer & Son,
Agents.