A NEW METHOD OF INTRODUCING BURNING GAS INTO MELTING FURNACES, AND THE APPARATUS EMPLOYED THEREFOR
Year: 1873

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company,
Patent Agency, of Frankfort on the Main (Germany), for the In-
vention of "A NEW METHOD OF INTRODUCING BURNING GAS INTO MELTING
FURNACES, AND THE APPARATUS EMPLOYED THEREFOR."-A communication
from Emil André, Engineer, residing at Wetzlar (Germany).
Sealed the 12th May 1874, and dated the 25th November 1873...
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the
Office of the Commissioners of Patents, with his Petition, on the
25th November 1873.
I, FRANK WIRTH, of the Firm of Wirth and Company, Patent Agency,
of Frankfort on the Main (Germany), do hereby declare the nature of
the said Invention for "A NEW METHOD OF INTRODUCING BURNING GAS INTO
MELTING FURNACES, AND THE APPARATUS EMPLOYED THEREFOR," a communication,
to be as follows:-
My improved injector is constructed for introducing burning gas,
especially oxyd of carbon, into high furnaces or other smelting furnaces
for reducing and melting metals, especially into iron high furnaces, and

page_text: that only by the sucking power of the blast without the aid of any other
power.
Into the water tuyer of the blast furnace a cast-iron tube is inserted
instead of the usual cast-iron lining, the said tube having a double
conical mouth and its back end being closed. In the back end of the 5
said tube is a well turned aperture through which the blast pipe is
introduced. At the forward end of the said tube are four well turned
guide bars so constructed that the said tube and the blast pipe have
always the same central axle. The mouth of the blast pipe is conical,
turned outside and ground inside of the injector mouth. The blast pipe 1
slides easily in the back end and guide bars of the said tube, and also in
the lower part of the hanging blast tube. The blast coming from the
hanging blast tube passes. through the tube box and through an oval
opening into the blast pipe.
The gas enters into the injector through a drawn tube which is closed 1
by a stop-cock.
C
The horizontal movement of the blast pipe is effected by the usual
toothed rack. By withdrawing the blast pipe an annular space is
formed between the mouths of the injector and the blast pipe; through
this annular space the gas enters the furnace sucked by the sucking a
power of the blast and meets together with the blast directly at the
entrance to the furnace.
On each injector a small water guage is fixed for observing the
depression within the injector. Each of the blast pipes of the furnace
is provided with a gas injector which is fed from the main gas conduct
by the said drawn tube. The gas conduct, a large plate tube, is fixed
round the furnace beside the blast conduct. Between the gas conduct
and the generator a purifier is provided; the water by which the purifier
is closed is mixed with burned limestone in proportion to the impurity
of the gas..
The gas is produced in generators having an under-grate blast coming
from a branch tube of the blast conduct. Of course where the ashes
are melted blast generators are also practicable.
☐ The effect will be improved as well by increasing the pressure of gas
(by the aid of an exhaustion ventilator); as by raising the temperature
of gas by the aid of Siemen's regenerator stoves or other heating stoves.

page_text: The materials for producing the gas are (according to local circum-
stances) either fresh mineral or vegetable combustibles, cinders, or other
rubbish; the best, if selection is possible, is close burning coal having.
but little ashes, in order to produce the maximum amount of carbonic
oxyd. The use of carburetted hydrogen gas or hydrogen gas though not
excluded is not so advantageous.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Frank Wirth in the Great Seal Patent Office on
the 21st May 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FRANK.
WIRTH, of the Firm of Wirth and Company, Patent Agency, of
Frankfort on the Main (Germany), send greeting.
WHEREAS Her most Excellent, Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fifth day of November, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Frank Wirth, Her special
licence that I, the said Frank Wirth, my executors, administrators, and
assigns, or such others as I, the said Frank Wirth, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "A NEW METHOD
OF INTRODUCING BURNING GAS INTO MELTING FURNACES, AND THE APPARATUS.
EMPLOYED THEREFOR," upon the condition (amongst others) that I, the said
Frank Wirth, my executors. or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention; and
in what manner the same was to be performed, and cause the same to
be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Frank Wirth, do hereby declare
the nature of the said Invention; and in what manner the same is to be

page_text: performed, to be particularly described and ascertained in and by the
following statement, reference being had to the accompanying Drawing
forming a part of this Specification.
My improved injector is constructed for introducing burning gas,
especially oxyd of carbon, into high furnaces or other smelting furnaces
for reducing and melting metals, especially into iron high furnaces,
solely by the sucking power of the blast without the aid of any other
power.
Figure 1 is & longitudinal section of my improved injector.
Figure 2 is a section on the line A, B, Figure 1. Like letters indicate
like parts in both Figures.
Into the water tuyere F of the blast furnace a cast-iron tube 6 is
inserted instead of the usual cast-iron lining, the said tube having a
double conical mouth and its back end being closed, with the exception 1
of a well turned aperture through which the blast pipe d is introduced.
At the forward end of the said tube 6 are four well turned guide bars e
so constructed that the said tube b and the blast pipe & have always the
same central axle. The mouth f of the blast pipe is conical turned out-
side and ground inside of the injector mouth a. The blast pipe d slides 2
easily in the packing c and guide bars e, and also in the lower part 1 of
the hanging blast tube through the packing at g and h. The blast
coming from the hanging blast tube passes through the oval opening i¸
into the blast pipe d.
The gas enters the injector through the drawn tube 7 which is closed 2
by the stop-cock m.
The horizontal movement of the blast pipe is effected by the toothed
rack p.
By withdrawing the blast pipe d an annular space n is formed
between the mouths of the injector and the blast pipe; through this
annular space n the gas enters the furnace, being drawn from the tube 1 3
and driven into the said furnace by the force of the blast, the gas and
the blast meeting directly at the entrance to the furnace.
On each injector is fixed a small water guage for observing the
depression within the injector. Each of the blast pipes of the furnace is
provided with a gas injector which is fed from the main gas conduct by 3

page_text: the said drawn tube 1. The gas conduct, a large plate tube, is fixed
round the furnace beside the blast conduct. Between the gas conduct
and the generator a purifier is provided; the water by which this
purifier is closed is mixed with burned limestone, the quantity of the
limestone varying according to the impurity of the gas.
The gas is produced in generators having an under-grate blast coming
from a branch tube of the blast conduct. Of course where the ashes are
melted blast generators are also practicable.
The effect will be improved by increasing the pressure of gas (by the
aid of an exhaust ventilator), and also by raising the temperature of the
gas by the help of Siemen's regenerator stoves or other heating stoves.
The materials for producing the gas are (according to local circum-
stances) either fresh mineral or vegetable combustibles, or cinders and
other rubbish; the best material being close burning coal having but
little ashes, in order to produce the maximum of carbonic oxyd. The
use of carburetted hydrogen gas or hydrogen gas, though not excluded,
is not so advantageous.
Having thus fully described the nature of the said Invention, and
shown how the same may be conveniently and advantageously carried
into practice, I claim,—
First. Introducing burning gas into high furnaces and other melting
furnaces by the said gas being drawn into the furnace solely by the
force of the blast.
Second. A gas injector consisting of the cast-iron tube b, with mouth a,
and blast pipe d, with conical mouth f, there being an annular space n
between the mouths of the said tube and pipe, the guide bars e and the
packing c in combination with the gas supply tube / and stop-cock m,
substantially as shown and described.
In witness whereof, I, the said Frank Wirth, have hereunto set my
hand and seal, this Eleventh day of May, in the year of our Lord
One thousand eight hundred and seventy-four.