Improvements in or relating to Furnaces for Burning Refuse, and in Treating the Slag therefrom.
Year: 1898

page_text: Date of Application, 15th Oct., 1908
Complete Specification Left, 17th May, 1899-Accepted, 8th July, 1899
Complete Specification Left, 17th May, 1899-Accepted, 8th July, 1899
Improvements in or relating to Furnaces for Burning Refuse, and
in Treating the Slag therefrom.
I, CARL WEGENER, of 14/15 Gitschiner Strasse, Berlin, in the German Empire,
Engineer, do hereby declare the nature of this invention to be as follows:-
The present invention is devised to produce the slag which is obtained in
furnaces for the destruction of refuse by the melting of the incombustible parts
of the refuse in small pieces, instead of blocks. This object is attained by allow-
ing the molten slag to fall into a vessel filled with water. By this means nearly
every drop is caused to cool separately and prevented from combining with the
previous and the following drops. At the same time the cooling of the slag is
quickly effected, whilst the heat conveyed to the water from the slag can be
made of use by the application of the said water as feed water for boilers. In a
practically effective form the invention may be carried out as follows:-
:-
Beneath the slag outlet which is arranged in the form of a slit across the sole
of the furnace is placed a long water-trough into which slag bogies are introduced
at one end, and are removed when fall from the other end. These bogies are
provided with holes in the bottom or in the sides. The middle part of the row
of bogies travelling from the one end of the water trough to the other, passes
beneath the slit through which the slag falls down. The two opposite narrow
walls of this aperture dip into the water of the trough and so form a water-seal
which prevents air from the outside from passing along the water trough into the
furnace.
The furnace is supplied with coal dust and air, and by means of a hopper
with the refuse to be destroyed.
The descent of the refuse from the hopper to the middle of the furnace may be
assisted by a mechanical stirring device consisting of bars provided with claws
which are worked to and fro by a shaft provided for this purpose with eccentrics.
To the end of the floor of the furnace is attached a contracted connection leading
from the internal space of the furnace to the flue, which contracted connection
allows only a portion of the combustion gases to pass directly into the flue. The
other portion is forced to escape by the same slit through which the slag falls
down, and is lell by a conduit underneath the floor of the furnace to near the
front of the same and from there through flues arranged alongside the furnace
and opening into the main flue just behind the above named contraction. The
heat of the combustion gases is utilized for heating steam boilers, for heating the
air supplied to the coal dust firing apparatus and for heating a current of air
to be sent into the hopper through which the refuse is delivered into the furnace.
The water trough beneath the outlet of the slag has an inclined floor on which
the bogies move automatically from the entrance point to the exit. The middle
part of the row of bogies is underneath the slag outlet. The spaces between each
couple of bogies are covered by plates fixed to the bogies so that the whole of the
slag discharged is passed into the bogies. The water contained in the trough may
be drawn off through a pipe as soon as it is heated and may be used as feed water

page_text: for boilers whilst the inlet pipe is automatically opened and closed by a valve
with float.
1
1000
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C.,
Patent Agents for the Applicant.
Improvements in or relating to Furnaces for Burning Refuse, and
in Treating the Slag therefrom.
I, CARL WEGENER, of 14/15, Gitschinerstrasse, Berlin, in the German Empire,
Engineer, 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 is devised to produce the slag which is obtained in
furnaces for the destruction of refuse by the melting of the incombustible parts
of the refuse in small pieces, instead of blocks. This object is attained by allow-
ing the molten slag to fall into a vessel filled with water. By this means nearly
every drop is caused to cool separately and prevented from combining with the
previous and the following drops. At the same time the cooling of the slag is
quickly effected, whilst the heat conveyed to the water from the slag can be
made of use by the application of the said water as feed water for boilers. In a
practically effective form the invention may be carried out as follows:-
Beneath the slag outlet which is arranged in the form of a slit across the sole
of the furnace is placed a long water-trough into which slag-bogies are introduced
at one end, and are removed when full from the other end. These bogies are
provided with holes in the bottom or in the sides. The middle part of the row
of bogies travelling from the one end of the water trough to the other, passes
beneath the slit through which the slag falls down. The two opposite narrow
walls of this aperture dip into the water of the trough and so form a water-scal
which prevents air from the outside from passing along the water trough into the
furnace.
The furnace is supplied with coal dust and air, and by means of a hopper
with the refuse to be destroyed.
The descent of the refuse from the hopper to the middle of the furnace may be
assisted by a mechanical stirring device consisting of bars provided with claws
which are worked to and fro by a shaft provided for this purpose with eccentrics.
To the end of the floor of the furnace is attached a contracted connection leading
from the internal space of the furnace to the flue, which contracted connection
allows only a portion of the combustion gases to pass directly into the flue. The
other portion is forced to escape by the same slit through which the slag falls
down, and is led by a conduit underneath the floor of the furnace to near the
front of the same and from there through flues arranged alongside the furnace
and opening into the main flue just behind the above named contraction. The
heat of the combustion gases is utilized for heating steam boilers, for heating the
air supplied to the coal dust firing apparatus and for heating a current of air
to be sent into the hopper through which the refuse is delivered into the furnace.
The water trough beneath the outlet of the slag has an inclined floor on which
the bogies move automatically from the entrance point to the exit. The middle
part of the row of bogies is underneath the slag outlet. The spaces between each
couple of bogies are covered by plates fixed to the bogies so that the whole of the
slag discharged is passed into the bogies. The water contained in the trough may

page_text: be drawn off through a pipe as soon as it is heated, and may be used as feed water
for boilers whilst the inlet pipe is automatically opened and closed by a valve
with float.
The invention is illustrated in the annexed drawings,
Figure 1 being a longitudinal section through the middle of the furnace.
Figure 2 a transverse section on the line 2-2 of Fig. 1.
Figure 3 a horizontal section on the line 3-3 of Fig. 2.
The furnace a is supplied through the opening a with coal dust and air, and
through the hopper with the refuse to be destroyed, and is also supplied with air
through the chamber 6° attached to the hopper. Both supplies of air for combus-
tion are preferably previously heated by means of the escaping gases from the
furnace. The descent of the refuse to the middle of the furnace is assisted by
means of a mechanical stirring device, consisting of bars c provided with claws,
which are worked to and fro by means of the shaft d provided for this purpose
with eccentrics. The connection between the furnace space a and the flue e for
the escaping gases, which flue is preferably led to the heating chamber of a steam-
boiler, is effected by. means of a contracted connection e", which arrangement
secures that a portion of the gases will pass through the opening f, through
which the molten slag falls down into the flue g passing backwards beneath the
sole of the furnace. This flue communicates at its end with two flues h, one at each
side of it. These two flues conduct the gases behind the contraction e° also to the
exit flue c. Beneath the slag outlet is placed the water-trough i, upon the
sloping bottom of which the bogies having perforated sides or bottom move
automatically from the entrance point to the exit point m. The middle part of
the row of bogies is underneath the slag outlet f, the two opposite narrow walls
of which outlet dip into the water of the trough to form a water seal which
prevents air from the outside from passing along the water trough into the furnace.
The spaces between each couple of bogies are covered by plates which are fixed
to the bogies so that the whole of the slag discharged is passed into the bogies. The
water contained in a trough i may be drawn off through the pipe as soon as it
becomes heated, and may be used as feed water for a boiler, whilst the inlet pipe o
is automatically opened and closed according to requirements, by means of a ball
cock o°.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a furnace for burning refuse the combination with the furnace of a
contracted connection between the furnace space and the exit flue, a slit on
the floor of the furnace for the outlet of the slag allowing at the same time the
escape of a portion of the combustion gases, a flue conducting such portion of the
combustion gases under the sole of the furnace and the sides thereof behind
said contracted connection to the exit flue, and a water trough or vessel underneath
the slit through which the slag is discharged, essentially as and for the purpose
described.
2. In a furnace for burning refuse as described in the first claiming clause,
the arrangement by which a series of bogies is automatically moved upon the slop-
ing bottom of the water trough, the middle part of the row of bogies passing
from one end of the trough to the other being always under the discharge opening
of the slag, essentially as and for the purpose described.
Dated the 17th day of May 1899.
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester, and Birmingham.