Improvements in and relating to Apparatus for Generating Steam, Chiefly Designed for Utilizing the Heat of Slag from Blast and other Furnaces.
Year: 1888

page_text: Improvements in and relating to Apparatus for Generating Steam,
Chiefly Designed for Utilizing the Heat of Slag from Blast and
other Furnaces.
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 :-
1
The object of this invention is to make a furnace in which the molten or heated-
slag or other heated refuse from smelting furnaces can be utilized in generating
steam; and my invention consists in the features and details of construction hereinafter
described.
In the accompanying drawings,
Figure 1 is a sectional elevation of my furnace and steam boiler taken through the
line of Figure 2 looking in the direction of the arrows.
Figure 2 is a sectional plan view of the slag furnace taken through the line y y of
Figure 1, looking in the direction of the arrows.
Figure 3 is a plan view of the boiler shown in Figure 1 with the cover removed.
Figure 4 is a plan view with the cover in place.
Figure 5 is a side elevation of a portion of the furnace, and the removing and
elevating carriers taken in the line of Figure 2, looking in the direction of the
arrows; and
Figure 6 is an enlarged view of a portion of Figure 5 taken in the line w w looking
in the direction of the arrow.
In the drawings, A represents the walls of my slag furnace; B the floor or table
on which the slag is deposited in the furnace; Ca blast pipe leading from a force
blower or fan around and above the floor or table; Da spout for depositing the molten
slag upon the floor or table; E a carrier for removing the slag when cooled ;
carrier for elevating the discharged slag and depositing it in a car or other conveyance
Fa

page_text: to remove it away; Ga roller or mop for coating the surface of the floor or table
with mud or other protecting surface; ga spout for supplying the mud; H the head
of the tubular boiler arranged above the slag floor or table; I the water tubes to
contain the water to be converted into steam; Ja pipe for conveying the steam to the
steam cylinder or other place of use; K a pipe for carrying the air and heat from
the boiler around into the blower or fan to be again discharged into the slag
furnace through the pipe C; La shaft for rotating the floor or table, and S a shaft
for rotating the mud drum and the removing and elevating carriers.
As above mentioned the object of my invention is the utilization of molten or hot
slag from smelting and other furnaces for the production of steam. As is well known,
this slag, when discharged in a hot or molten condition from smelting furnaces,
contains a great quantity of heat which has heretofore been wasted for the lack of
propor means to apply it to the production of steam or other useful purposes.
In constructing my slag furnace, as I term it, for utilizing the heat of hot or molten
slag in the production of steam, I make a slag holding or carrying table or floor B of
cast iron or other suitable material and preferably of circular form, as shown in
Figure 2 of the drawings.
This table or floor is provided on its under side with a rack of series of teeth 6,
as shown in Figures 1 and 5. These teeth are arranged in a circle around the under
side of floor or table. A shaft L, rotated by any convenient motive power carries a
gear wheel whose teeth mesh into the teeth b on the under side of the floor or table
and cause it to rotate. Of course it will be understood that the floor or table is
properly supported on a centre post and rollers moving upon a proper track to preserve
the proper position of the table and enable it to be rotated round and round. These
rollers centre posts and tracks are clearly shown in Figure 1 and as, by themselves,
they do not differ materially from the means employed for supporting and rotating a
table, they do not need to be more minutely described.
The floor or table B is located within the circular walls of the furnace A, which
surround and inclose it. These walls are preferably provided with a space between
them to be filled with water to prevent their being overheated and injured by the heat
of the molten slag. They need extend above the floor or top of the table no further
than necessary to enable the slag to be discharged on the floor and removed again
with facility. Probably twelve or fifteen inches will be found, in ordinary cases,
sufficient for this purpose.
Leading through the walls of the slag furnace I arrange a spout or pipe D, shown
in Figure 2 through which the slag from the smelting furnace may be carried and
discharged on the floor. This spout may be arranged either to carry the slag directly
from the smelting furnace, or from a receiver or other receptacle into which it may
be discharged from the smelting furnace as may best suit the convenience of the
operator in connection with the location and arrangement of his smelting furnaces.
A blast pipe C enters the walls of the slag furnace, preferably above the floor or table
and around its circumference, as shewn in Figure 2, through a straight pipe entering
the furnace to discharge a current of air upon the slag while on the table may be used
if preferred. This blast pipe may be turned so as to approach and surround the centre
piece of the table, as shewn in Figure 2, if desired. But in this case, that portion of
the blast pipe which crosses the floor or table to surround the centre post, should be
raised enough above the floor to permit the slag to pass beneath it as the floor is
rotated. This blast pipe it will be understood, is connected with a fan or blower,
shewn in Figures 1 and 2, by which a blast or current of air may be forced into it,
and it is provided with numerous perforations to permit the air when thus driven into
it to pass out or onto the floor or table, as indicated by the arrows in Figure 2. This
blast or current of air coming in contact with the hot molten slag will cause it to give
up or radiate its beat more rapidly, so that after it has been rotated around once on
the table or floor to the place of discharge it will probably have accomplished its
be purpose and ready for removal.
To remove the slag from the floor or table after it has wholly or partially given
forth or imparted its heat, I provide a carrier E, which consists of a series of scrapers

page_text: arranged on an endless chain, or in any other convenient way, which passes through
the walls of the slag furnace and which is rotated on two drums or shafts d d'
supported in a frame frivetted or otherwise fastened to the walls of the slag furnace
and extending out towards the middle of the same, as shewn in Figures 2 and 5.
As this removing carrier rotates it will scrape the slag from the floor or table as it is
delivered to it by the rotation of the table. The slag just removed from the floor or
table can be dropped into a receptacle R, in which an elevating carrier F may be
arranged, as shewn in Figure 5, whence it may be carried and discharged in a car to
admit of its being removed or taken away. In Figure 2 I have shewn a shaft S
which through a gear wheel revolves, a shafts to operate this elevating carrier, and
through a sprocket chain s' to rotate the shaft d' which operates the removing carrier E.
The rotation of this shaft d¹ rotates another shaft and with it the drum or mop G
shown in Figure 2. This drum or mop G is fastened to a frame g¹ bolted or other-
wise fastened to the inside wall of the slag furnace, as shewn in Figure 2. It is
located close to the removing carrier E and beyond it in the direction of the
rotation of the table so that the table passes under it immediately after passing under
the removing carrier E. A spout or pipe g enters the furnace between the removing
carrier E and the drum or mop G through which a stream of this mud or other
material may be discharged on the table. As the table passes under the drum or
mop G, this mud, or wash, as it may be termed, will be spread on the table so as to
furnish it with a thin coating to protect it from the intense heat of the hot molten
slag and to prevent the slag from adhering thereto. Around the removing carrier E,
and the mud drum or mop G, may be arranged a case T to cover and protect them,
with an opening or space at one side under it marked t to admit the slag as the table
rotates so that it can come within the reach and operation of the removing carrier E.
As the removing and elevating carriers, the mud drum, and the means for rotating
them are clearly shewn in Figures 2 and 5, and as the novelty of my invention does
not consist in the particular means employed for rotating the carriers and drum, they
need not be further described in detail.
Above the walls of the smelting furnace, and resting upon them if desired,
I arrange a tubular boiler with hollow heads H and water tubes I running back
and forth between these heads. By reference to Figure 2 it will be seen that these
tubes are arranged in a series or coil, so to speak, so that water in them may circulate
back and forth through them and the heads H. These tubes are provided with
spaces between them, as shown in Figures 1 and 2, so that the heat thrown off by
the molten slag on the floor or table passes up freely between them, as shown by tho
arrows in Figure 1. The arrangement of these tubes and heads may be in the
ordinary way in which tubular boilers are constructed. If preferred, however,
instead of tubes, a shell boiler, with its tubes extending up vertically through it
may be employed. The boiler is preferably covered or inclosed, and in Figure I this
enclosing wall or cover is indicated by the dark line A. At the top of the tube may
be located a pipe J to carry the live steam as generated to the cylinder or case where
it is to be used as in ordinary boilers. From the top of the inclosure or cover a
pipe K, preferably provided with branches, as shown in Figure 4 leads back to
the fan or force blower so that the heated air passing up through the tubes of the
boiler may be drawn off and carried down through the fan or blower and again
driven into the slag furnace into contact with the molten slag. A pipe K' connecting
with the pipe K is however provided, and a valve k arranged therein, so that this
heated air can be shut off from the fan or blower and discharged, if desired.
In Figure 2 I have shown a fire box or chamber F1 which may be located outside
the slag furnace with an opening communicating into the same, so that if there
should be an insufficient quantity of hot or molten slag at any time an auxiliary
fire may be obtained to reinforce or assist the operation of the slag furnace in
producing the necessary heat for the generation of steam.
By slag I mean not only what is technically known by that designation, but any
heated material or refuse that is allowed to cool without its heat being utilized about
smelting furnaces factories, or the like.

page_text: Having now particularly described and ascertained the nature of my 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 :-
First. In a slag furnace, the combination of a steam generating boiler a slag
holding table adapted to be rotated horizontally and means for rotating the same,
substantially as described.
Second. In a slag furnace, the combination of a steam generating boiler, a slag
holding table underneath the same, and removing device, whereby the table is
cleared of the slag after imparting its heat, substantially as described.
Third. In a slag furnace, the combination of a slag holding table, a pipe or spout
discharging a wash thereon and a mop or roller for spreading the same over the
surface of the table, whereby the slag is prevented from injuring the table or
adhering thereto, substantially as described.
Fourth. In a slag furnace, the combination of a slag holding table a slag removing
device, a wash spreading mop or roller, and a boxing inclosing the carrier and mop,
substantially as described.
Fifth. In a slag furnace, the combination with a steam generating boiler, of a slag
travelling holding table, means for rotating the same and an air blast pipe discharging
a blast or current of air upon the slag while on the table, substantially as described.
Sixth. The combination in a slag furnace of a steam boiler and slag holding tablo
and an auxiliary fire chamber or box to reinforce and assist the heat of the slag,
substantially as described.
021
1
.
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.