Slag Conveyors and Steam Generating Furnaces
Year: 1888

page_text: I, HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings in the County of Middlesex 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 :-
This invention relates to Slag Conveyors and Steam Generating Furnaces.
In the accompanying drawings,
Figure 1 is a side elevation of the improved slag conveyor and steam generating
furnace, showing the apron for carrying the slag, the covering in which the boiler is
located, and the boiler heads where the covering is removed for a part of the distance
at the left hand of the Figure.
Figure 2 is a longitudinal vertical central section taken through Figure 3, showing
the boiler at the right hand in elevation.
Figure 3 is a plan view taken in the line rx of Figure 1.
Figure 4 is a vertical transverse section taken in the line of Figure 1, showing
the boiler in elevation.
Figure 5 is a plan view of one of the apron frames.

page_text: Figure 6 is a transverse section of the same with the apron plate or pan in place and
Figure 7 is a plan view of a portion of the apron axle and apron wheel showing the
connection of the two.
In the drawings A represents the case in which the slag boiler is located and by
which it is inclosed; A¹ the inclosing case of the mat boiler; B the boiler heads;
C the boiler heating tubes ; D the receiver into which the slag is emptied; d the spout
by which the slag passes onto the slag conveying apron ; d' the spout by which the mat
of the slag is emptied into a pan Ẹ under the mat boiler; e the crank for tilting the
said pan; F a segment rigidly attached to trunnions on the receiver D to enable the
receiver to be tipped; fa gear for rotating the segment and tipping the receiver ;
the crank by which such rotation is effected f³ the paul for holding the gear in any
desired position; G the slag conveying apron G¹ the frames on which the plates of
such apron are located ; the apron axles on which the apron wheels are mounted ;
g¹ the apron wheels at the ends of the apron axles; H a trough shaped track or bed on
which the apron wheels roll as the slag is carried forward; H¹ sprocket wheels moving
the slag conveying apron; h links for connecting the apron frames together; I the
track or bed on which the apron wheels move after passing under the sprocket
wheels; a perforated water pipe keeping such bed and wheels moist and cool; J the
pans composing the slag conveying apron; the thimble connecting the apron axle
with the apron wheels and on which the wheels revolve; K air pipes for taking air out
of the boiler cases; K₁ a common pipe to convey the air brought by the pipe K from
the boiler case to the fan blower; K2 the pipe leading from the blower; a branch
leading from pipe K along the outside of the boiler cases; ¹ and k³ perforated
branches entering at the end of the case A and passing along between the boiler heads
and above the slag conveying apron to permit the air to escape onto the slag through
perforations; ³ the delivery end of the branch k leading a current of air onto the pan
beneath the mat boiler; another branch delivering a current of air onto the slag
as it falls onto the travelling apron; L steam pipes conveying the steam from
the boiler heads to the place of use; M a car for receiving the mat when dumped
from the pan E; N, a car for receiving the slag when it is dumped from the
slag conveying apron; O, a boiler feed pipe for supplying the boiler with water;
S the frame on which the boilers are mounted, and in which the conveying apron,
sprocket wheels and other parts are located S¹ the frame for the mat boiler; the
overhanging portion of the frame or structure; and s¹, the plates to close the space
between the apron and the bottom of the boiler heads.
In making my improved slag conveyor and steam generating furnace, I preferably
make a slag and a mat boiler consisting of hollow boiler heads with a series of heating
tubes passing back and forth between them. In the drawings I have shown boiler
heads as containing alternating inclined surfaces, but as to this feature I make no
claim. I preferably mount these steam boilers close to each other, but with sufficient
space intervening to permit the location and operation of the parts hereinafter
described. As a means for supporting these boilers I prefer to employ a supporting
frame or structure that will raise them enough to afford a considerable space beneath.
I prefer also that the supporting frame or structure on which the boilers are to be
located shall overhang, so to speak, at the top for reasons hereinafter described. As
most nearly embodying my idea of a suitable supporting frame or structure, I have
shown, particularly in Figure 4, one made with a bottom connecting the parts, with
sides rising from the bottom and turning in at the top to afford a proper support for
the boiler. This supporting frame or structure may be in short pieces or sections and
need not be the length of the boiler. More strictly speaking, perhaps, they can be
termed standards placed at certain intervals apart. To connect them together, when
thus made and to prevent the heat from the slag escaping and the cold air from
entering between the slag conveying apron and the bottom of the boiler heads, a
plates should extend from one end of the boiler to the other and preferably resting
upon the overhanging flanges of the frame. This plate is shown in plan in Figure 3
and in section in Figure 4, and will be readily understood by an inspection of the
drawings.

page_text: Beneath the slag boiler, inclosed in the case A, I arrange near each end sprocket
wheels H', mounted on a proper shaft, revolving in suitable bearings and rotated by
any convenient motive power. I make a slag conveying apron G consisting of a
number of pans or plates J resting on apron frames G₁. One of these apron frames is
particularly shown in Figure 5 of the drawings, and consists of a frame on which a
pan or plate may he riveted or otherwise fastened, and is provided with extensions or
apron axles g on which the apron wheels are mounted. The different frames are
connected together by links which will enable them to turn while passing around the
sprocket wheels. The double links, as shown in Figure 5, afford means for engagement
with the teeth of the sprocket wheels so that the apron can be moved by their rotation.
Surrounding the end of the apron axles g I preferably employ thimbles j so held by
pins as to remain in a fixed position on the axle. The axle wheels rotate on these
thimbles so that, as they become worn, they may be removed and new ones substituted
in their places. The arrangement of these parts will be readily understood from an
inspection of Figure 7.
To afford a track or bed for the wheels g' to rotate on as the apron G with its
frames G¹ is moved forward, I preferably arrange brackets on the sections or standards
of the supporting frame or structure, and locate on these brackets trough shaped
beds H. These brackets will be beneath the overhanging portions of the supporting
frame and will bring the apron wheels out some distance from the sides of the apron.
In this way they will be located away from. the intense heat of the slag and in a great
measure protected from its effects. To permit this I make the top of the supporting
frame overhanging, as above set forth. But the wheels will be measurably protected,
and perhaps sufficiently, if they are brought out beyond the sides of the slag conveying
apron by the projection of the apron axles, even though the supporting frame or
structure be not overhanging and no such brackets be provided. To still further
protect the wheels I make the trough shaped beds or tracks preferably so that they can
contain water in which the apron wheels may travel in order that they may not in any
case become overheated. As the apron wheels pass around the sprocket wheels they
come onto the beds I upon the lower part of the standards or sections of the supporting
frame. To assist in cooling them as they pass back I prefer to arrange a perforated
water pipe which runs along just above the wheels and permits water to drop through
the perforations on them. The arrangement of the sprocket wheels, the slag
conveying apron, the beds H, the apron wheels g', the perforating pipe i and the beds I,
will be apparent from an examination of Figure I where a side view is presented, and
Figure 4 where a sectional end view is presented.
Between the slag and the mat boilers I prefer to locate a slag receiver D), into
which the hot or molten slag from smelting furnaces may be delivered. This receiver
is of course to be supported on suitable frame work, and at the proper elevation to
adapt it to the work intended. It is provided with a spout d overhanging the slag
conveying apron, so that the molten slag may flow out and fall upon the apron and be
carried forward beneath the heating tubes of the slag boiler to convert the water
contained in them into steam. The metal which is contained in the slag will sink to
the bottom of the receiver. I provide the receiver with another spout d' which
extends into the case A¹ enclosing the mat boiler. I provide the receiver with
trunnions rigidly attached to its sides and working in a suitable bearing in the
supporting frame. I rigidly attach to the ends of the trunnions which project
beyond the bearings, a toothed segment F which engages with the teeth of the gear f,
which in turn may be rotated by a crank and held in any desired position by a
paul When a sufficient quantity of mat has collected in the bottom of the receiver
I tip the end of the receiver which contains the spout d' down by rotating the
segment F through means of the gear and crank above described. In the bottom of
the case enclosing the mat boiler I arrange a pan E supported on trunnions to which
a crank e is rigidly connected. By means of this crank I am able to tip the pan E
when the mat which has been dumped in from the receiver has sufficiently expended
its heat as to be no longer useful. Beneath the pan E a car M or other conveyor

page_text: may he arranged, into which the cooled mat may be dumped to be carried away.
The arrangement and operation of these parts will be apparent on an examination of
Figures 2 and 3 of the drawings, and I will only add that the mat furnace may also
be heated by the employment of slag instead of mat, if necessity or convenience require.
As the slag falls from the spout d on the conveying apron it is carried forward
beneath the heating or water tubes of the slag boiler so as to heat the water which
they contain and convert it into steam. When they reach the end of the apron as
shown in the left hand of figure 1, the slag will be dumped into the car or conveyor N
to be removed.
To assist the slag in throwing off and radiating its heat I bring a current of air
into contact with it as it falls upon the conveying apron. To get the benefit of the
air already heated I have arranged a series of pipes K which lead preferably from the
top of the cases containing the main and auxillary boilers into a main pipe K' which
passes down to a fan blower shown in figure 4. Leading from the fan
blower is a pipe K' which has 3 branches kkk. The pipe leads along
the outside of the cases and enters the case containing the mat furnace
through an opening where a current of air is directed upon the mat discharged
into the pan E. The branches k¹ and enter the case of the slag boiler and
pass from end to end above the slag conveying apron and between the heads of
the boiler. These pipes are provided with a number of perforations so that the air
escapes upon the heated slag as it passes along beneath the boiler. Still another
branch leads from the pipe k and enters beneath the slag receiver D so as to reject
a current of air against the slag as it falls from the spout d on the travelling apron.
Both the slag and the mat are thoroughly exposed to the action of air and by taking
the air from the enclosing cases as above described, it is more or less heated when
it comes into contact with the slag, though I do not confine myself to the use of
heated air.
The steam generated hy the heated slag and the mat in the slag and mat boilers is
collected in a series of pipes L which lead from the heads of the boilers and carry the
steam to some common pipe whence it may be conveyed to the cylinder or other place
of use.
Having now particularly described and ascertained the nature of the said inven-
tion 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,
First. In a slag conveyor and steam generating furnace the combination of a boiler
supporting frame or structure provided with brackets on its inner sides, a boiler
arranged thereon, beds or tracks supported on the brackets and a slag conveying
apron provided with apron wheels rolling on the beds or tracks substantially as
described.
Second. In a slag conveyor and steam generating furnace the combination of a
boiler supporting frame or structure overhanging at the top and provided with
brackets on its inner sides a boiler arranged thereon, beds or tracks supported on the
brackets, and a conveying apron provided with apron wheels rolling on the beds or
tracks substantially as described.
Third. In a slag conveyor and steam generating furnace the combination of a boiler
supporting frame or structure, a boiler arranged thereon, a slag conveying apron
provided with apron wheels mounted on apron axles projecting beyond the sides of
the apron and rolling on beds or tracks, substantially as described.
Fourth. In a slag conveyor and steam generating furnace the combination of a
boiler supporting frame or structure a boiler arranged thereon, a slag conveying apron
travelling beneath the water heating tubes, and a plate to prevent the heat from the
slag on the conveying apron from escaping and cold air from entering between the
apron and the boiler heads substantially as described.
Fifth. In a slag conveyor and steam generating furnace, the combination of a boiler
supporting frame or structure, a boiler arranged thereon, a slag conveying apron

page_text: provided with apron wheels and trough shaped beds or tracks adapted to contain
water and in which the apron wheels travel whereby they are prevented from becoming
overheated substantially as described.
Sixth. In a slag conveyor and steam generating furnace the combination of a boiler
supporting frame or structure a boiler arranged thereon, a slag convoying apron
provided with apron wheels travelling on tracks or beds and a perforated water pipe
arranged over the wheels and spraying water onto the same substantially as described.
Seventh. In a slag conveyor and steam generating furnace a slag conveying apron
provided with apron axles, sleeves or thimbles encircling the ends of the axles and
fixed in their relation thereto and apron wheels mounted and revolving on the sleeves
or thimbles substantially as described.
HASELTINE, LAKE & Co.,
4.5, Southampton Buildings, London,' W.C.,
Agents for the Applicant.