An Improved Tuyere.
Year: 1891

page_text: Date of Application, 5th Dec., 1891
Complete Specification Left, 12th Dec., 1891-Accepted, 16th Jan., 1892
PROVISIONAL SPECIFICATION.
An Improved Tuyere.
I, WILLIAM BUTLIN, of Irthlingborough Iron Works, Irthlingborough, in the
County of Northampton, Manufacturer do hereby declare the nature of this
invention to be as follows:-
:-
My invention relates to tuyeres for blast furnaces and for other uses to which
tuyeres are applicable.
Heretofore, tuyeres have been made conical both inside and outside throughout
their entire length. According to my invention I make my improved tuyere with
an inner tube which is cylindrical for a part of its length at the delivery end and
is conical for the remaining part of its length.
This construction secures many advantages as compared with the ordinary
conical tuyere, among which I may mention the following, riz., it gives greater
penetration to the air supplied through the tuyere, and causes the air to be carried
further towards the centre of the furnace, thereby giving better and more uniform
results in smelting. The walls of the furnace are maintained cooler and the said
furnace is rendered more durable and less liable to scaffold.
A further very
important advantage of my improved tuyere is that it can be repaired at the nose
several times without altering the internal diameter of the mouth. In ordinary
conical tuyeres it is obvious that repairing or re-nosing enlarges the internal
diameter of the delivery end. There also arises from the use of my improved
tuyere a tendency to economy of fuel, as the mechanical effect of the blast in
separating the particles of fuel and driving them into the pores of the ore is
greater than with ordinary tuyeres and thereby a more highly carbonised iron is
produced without extra cost of fuel.
Dated this 5th day of December 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Tuyere.
I, WILLIAM BUTLIN, of Irthlingborough Iron Works, Irthlingborough, in the
County of Northampton, Manufacturer, 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 tuyeres for blast furnaces and for other uses to which
tuyeres are applicable.
Heretofore tuyeres have been made with a conical bore throughout their entire
length I have found that such form of tuyere is not the most advantageous and
may be very considerably improved upon by changing the shape of the bore. The
improved tuyere made according to my invention has an inner tube or bore which
is cylindrical for a part of its length at the delivery end and is conical for the
remainder of its length.
In the accompanying drawing I have shewn in longitudinal central section a
tuyere constructed according to my invention.
In this drawing A is the inner tube B is the outer tube, and C is the water space
between the two tubes. The inner tube A is cylindrical for a portion of its length
at the delivery end as at A', and is conical for the remaining portion of its length
as at A'. The outer tube B may be of a conical form throughout its length as
[D7

page_text: usual or it may be partly cylindrical and partly conical. I usually make the
cylindrical part A' of a length about equal to one third the whole length of the
tuyere, but this may be varied to suit different requirements.
A tuyere constructed in the manner above described possesses many advantages
over the ordinary conical bore tuyere, among which I may mention the following.
My improved tuyere gives greater penetration to the air passing through it, and
causes the air to be carried further towards the middle of the furnace, thereby
giving more uniform and better results in smelting. The walls of the furnace are
moreover kept cooler, and the furnace is rendered more durable and less liable to
scaffold. A further very important feature of my improved tuyere is that it can be
repaired at the nose several times without altering the internal diameter of the
mouth. In ordinary conical tuyeres it is obvious that repairing or renosing
enlarges the internal diameter of the delivery end, and therefore makes it more or
less unsuitable for the work it has to do. There also arises from the use of my
improved tuyere a tendency to economise fuel as the mechanical effect of the blast
in separating the particles of fuel and driving them into the pores of the ore is
greater than with ordinary tuyeres and therefore a more highly carbonised iron is
produced without extra cost of fuel.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
―:
A tuyere constructed with an inner tube or bore which is cylindrical at the
delivery end and conical for the remainder of its length, substantially as described
with reference to the accompanying drawing, for the purpose specified.
Dated this 12th day of December 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.