IMPROVEMENTS IN THE CON- STRUCTION OF TUYERES FOR BLAST FURNACES
Year: 1878

page_text: LETTERS PATENT to David George Hoey, of Workington, in the County of
Cumberland, Ironmaster, for the Invention of "IMPROVEMENTS IN THE CON-
STRUCTION OF TUYERES FOR BLAST FURNACES."
Sealed the 24th January 1879, and dated the 27th July 1878.
PROVISIONAL SPECIFICATION left by the said David George Hoey at the
Office of the Commissioners of Patents on the 27th July 1878.
DAVID GEORGE HOEY, of Workington, in the County of Cumberland, Iron-
master. "IMPROVEMENTS IN THE CONSTRUCTION OF TUYERES FOR BLAST
FURNACES."
My Invention relates to an improved method of constructing the tuyeres used in
connection with blast furnaces, and consists in providing means for inspecting at all
times the working of the water coil pipe for bringing additional cooling power to
bear at once when and where necessary, and for preventing the water from finding
its way into the furnace when the covering or coil pipe becomes burned.
According to my Invention I make use of the ordinary water coil pipe, but
instead of its being completely inibedded in the cast iron or other covering it is
covered with the cast iron or other covering on the outside only, and left uncovered
and open to inspection in the interior by means of a space all round, which space
is closed in the interior of the tuyere by means of an inner tube or pipe of malle-
able or cast iron, or other metal or material cast into or otherwise fixed to the nose
of the outer covering, and extending backwards to any desired length; through this
inner tube the nose pipe for conveying the blast into the interior of the furnace is
passed, but the space between the outer covering and the inner tube is left open at
the back or outer end.
Along the top of the inner tube or pipe a small water pipe or pisser is led in the
direction of the nose of the tuyere, to keep it and the junction of the outer covering
and inner tube always cool.
The outer cast-iron or other covering may either be permanently attached to the
outside of the coil pipe or made independently, and the coil pipe inserted afterwards,

page_text: in which latter case the coil pipe may either be so constructed as to press close up
against the covering, or the covering may be grooved to receive it, and in either case
the coil pipe may be attached to the covering by means of iron rust or other suitable
adhesive.
The coil pipe may be made round, as is usual, but I prefer to have it flattened
against the outer covering, so as to afford the greatest possible coating surface.
The space between the outer covering and the inner tube enables the working of
the coil to be inspected at all times, also enables additional water to be injected
along the top of the nose, as already described, as well as at any other point when-
ever necessary for extra cooling, and when the outer covering or the coil pipe
becomes burned, the water is prevented from entering the furnace by the blast
forcing it back into the outer air through the space left at the back between the
outer covering and the inner tube.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said David George Hoey in the Great Seal Patent Office on the 27th*
January 1879.
DAVID GEORGE HOEY, of Workington, in the County of Cumberland, Iron-
master. "IMPROVEMENTS IN THE CONSTRUCTION OF TUYERES FOR BLAST
FURNACES."
My said Invention relates to an improved method of constructing the tuveres
used in connection with blast furnaces, and consists in providing means for inspect-
ing at all times the working of the water coil pipe for bringing additional cooling
power to bear at once when and where necessary, and for preventing the water
from obtaining access to the furnace when the covering or coil pipe becomes
burned.
The accompanying Sheet of Drawings illustrates in Figures 1 and 2 respectively
two modes of carrying out my said Invention, the said Figures being sectional
views of portions of tuyeres having the same applied thereto.
According to my said Invention I make use of the ordinary water coil pipe a,
but in lieu of its being completely imbedded in the cast-iron or other covering, it is
covered with the cast-iron or other covering on the outside only, as shown at b, and
left uncovered and open to inspection in the interior by means of a space c all
round; this space
is closed in the interior of the tuyere by means of an inner tube
or pipe d of malleable or cast iron, or other suitable metal or material, either cast
into the nose of the outer covering b, as shewn in Figure 1, or made separate there-
from, as shewn in Figure 2, and secured to it in any convenient manner, the inner
tube or pipe in either case extending backwards to any desired length. Through
the inner tube d the nose pipe (not shewn in my Drawings), for conveying the blast
into the interior of the furnace is passed, but the space between the outer covering b
and the inner tube d is left open at the back or outer end e.
Above the top of the inner tube or pipe d is placed a small water pipe or pisser f,
in the direction of the nose of the tuyere, in order to maintain the latter and the
junction of the outer covering b and inner tube & constantly in a cool condition.
The outer cast-iron or other covering b may either be permanently attached to
the outside of the coil pipe a, or be made independently, and the coil pipe inserted
afterwards, in which latter case the coil pipe may either be so constructed as to press
close up against the covering, as shewn in Figure 1, or the covering may be grooved
for its reception, as shewn in Figure 2, and in either case the coil pipe may be
attached to the covering by means of iron rust or other suitable adhesive material.
The coil pipe may be constructed of a round shape, as is usual, or it may be made
of a flattened form against the outer covering, so as to afford the greatest possible
amount of cooling surface.
The space c between the outer covering and the inner tube d admits of the
working of the coil being inspected at all times, and also enables additional water
to be injected along the top of the nose, as herein-before described, as well as at any
other point, whenever necessary, for extra cooling, and when the outer covering or
the coil pipe becomes burned, the water is prevented from entering the furnace by
the blast forcing it back into the outer air through the space at e left at the back,
between the outer covering and the inner tube.
The outer covering b is provided with a swell or projection g on its under side, so
as to form a lip for the discharge of the water supplied by the pipe f.
The spaces between the coils on the lower side are filled up, as shown at i, with
a substance which, while sufficiently resistant to allow the water from the pipe f to
run off freely without lodging in the spaces between the coils at the bottom would
yield readily if the tuyere were to burn.
It is preferred to make the exit from the coil at the upper side, so that the coil
may not run partially dry when worked with half supply, and a tap may be pro-

page_text: vided at the under side, by means of which the coil can be rapidly and completely
emptied.
Having now. described and particularly ascertained the nature of my said Inven-
tion, and the manner in which the same is or may be used or carried into effect, I
would observe in conclusion that what I consider to be novel and original, and
therefore claim as the Invention secured to me. by the herein-before in part recited
Letters Patent is, constructing tuyeres for blast furnaces, substantially in the manner
and for the purposes herein-before described.
In witness whereof, I, the said David George Hoey, have to this my Speci-
fication set my hand and seal, this Twenty-seventh day of January, One
thousand eight hundred and seventy-nine.
DAVID GEORGE HOEY. (L.S.)