Year: 1885

page_text: I, FREDERICK SIEMENS of N° 12 Queen Annes Gate Westminster in the County
of Middlesex, Engineer do hereby declare the nature of this invention to be as
follows:-
•
My invention relates to a regenerative gas furnace whereby I effect in a
continuous manner the reduction of iron ores. The furnace is preferably in the
form in plan of a long rectangle. At the one end I form the flues for admitting
the heated air and gas from the regenerators and for passage of the products of
combustion to the regenerators, these two sets of flues being arranged the one set
at the side of or above the other set so that the flame sweeps from the one set
along the length of the furnace bends back and returns to the other set. Next to
this end of the furnace I form a deep bed or basin from which I carry a slope up
to the extreme end of the furnace where there is an opening through the root.
Through this opening I feed pulverised ore mixed with reducing inaterials and'
fluxes. This as it gradually descends the slope is subjected to the radiant heat of
the flame which has the effect of reducing the ore, and the metal produced flows
down to the basin where it is collected with the slag above it. I provide a tapping
hole from which the slag is allowed continuously to flow, and a lower tapping hole
by which from time to time I draw off a portion of the molten metal, leaving
always a large mass of the metal in the basin. I also provide a third tapping hole
at the bottom of the basin for the purpose of running off the whole contents when
desired.
The furnace may be made in duplicate form that is to say with a slope on each
side and the basin bed between them, the flues being arranged as described above
so that the flame takes a direction at right angles to the lines of descent along
the slopes.
+

page_text: Regenerative Gas Furnace for Continuous Reduction of Iron Ore.
I, FREDERICK SIEMENS of N° 12 Queen Annes Gate, Westminster in the County
of Middlesex, 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 :—
My invention relates to a regenerative gas furnace whereby I effect in a
continuous manner the reduction of iron ores. The furnace is preferably in the
form in plan of a long rectangle. At the one end I form the flues for admitting
the heated air and gas from the regenerators and for passage of the products of
combustion to the regenerators, these two sets of flues being arranged the one set
at the side of or above the other set so that the flame sweeps from the one set
along the length of the furnace bends back and returns to the other set. Next to
this end of the furnace I form a deep bed or basin from which I carry a slope up
to the extreme end of the furnace where there is an opening through the roof.
Through this opening I feed pulverised ore mixed with reducing materials and
fluxes. This as it gradually descends the slope is subjected to the radiant heat of
the flame which has the effect of reducing the ore, and the metal produced flows
down to the basin where it is collected with the slag above it. I provide a tapping
hole from which the slag is allowed continuously to flow, and a lower tapping hole
by which from time to time I draw off a portion of the molten metal, leaving
always a large mass of the metal in the basin. I also provide a third tapping hole
at the bottom of the basin for the purpose of running off the whole contents when
desired.
The furnace may be made in duplicate form that is to say with a slope on each.
side and the basin bed between them, the flues being arranged as described above
so that the flame takes a direction at right angles to the lines of descent along
the slopes.
Fig. 1 of the accompanying drawings is a longitudinal section. Fig. is a
sectional plan and Figs. 3 and 4 are transverse sections of a furnace according to
my invention. At the one end of the furnace are the two sets of air flues A A¹
and under them the gas flues G G which communicate with the regenerative
chambers R. Hot air and gas issuing from the one set of flues A and G form a
flame which sweeps lengthways along the furnace and bends back before reaching
the slope at the farther end, the products of combustion passing by the other set of
flues A and G' to one set of the regenerators. On alternating the current, the
flame in like manner sweeps from A' and G and bends back, the products of
combustion passing by A and G to the other set of regenerators. At the farther
end of the turnace is a slope S on to which is fed through a hole H in the crown
of the furnace pulverised ore mixed with reducing and fluxing materials.. The
molten material collects in the deep basin bed B, provided with several tap holes T
at different levels, so that either the slag floating on the metal can be tapped off,
or a portion of the molten metal can be tapped off leaving a large body of metal
still in the bed, or, when desired, the lowest tap hole can be opened to empty
the bed

page_text: Fig. 5 is a section and Fig. 6 a sectional plan of a furnace of this kind made in
duplicate form with a slope S on each side of the basin bed B. In this case the
one set of air and gas flues A and G are on the one side and the other set A¹ and Œ¹
on the other side of the middle line, so that the flame from the one set sweeps
forwards and bends backs, the products of combustion escaping by the other set.
The dimensions of the furnace and the direction of the flues are such that the flame
does not impinge on any part of the structure, nor on the material on the slope or
in the bed, but acts by radiant beat alone.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that
I make no general claim to a furnace in which ore descends a slope to feed a
basin bed where in admixture with carbonaceous substances it is subject to the
action of a gas flame but what I claim is :-
The construction of a regenerative gas furnace for continuous reduction of iron
ore, having at one of its ends or sides the air and gas flues which communicate
with the regenerators, having a deep basin bed provided with tap holes, and having
beyond or at each side of the bed a slope fed with ore mixture from the crown of
the furnace, the flues being so arranged and the furnace so proportioned that the
flame acts by radiant heat alone, substantially as herein described.
ABEL & IMRAY,
Agents for the Applicant.