IMPROVEMENTS IN ECONOMIZING OR UTILIZING THE WASTE HEAT FROM MELTING OR OTHER FURNACES, AND IN THE APPLICA- TION OF THE SAME FOR HEATING STRAM BOILER OR OTHER FURNACES."
Year: 1872

page_text: LETTERS PATENT to Joseph Knott, of the Firm of Joseph Knott and
Company, Highfield Steel Works, Sheffield, in the County of York,
for the Invention of "IMPROVEMENTS IN ECONOMIZING OR UTILIZING
THE WASTE HEAT FROM MELTING OR OTHER FURNACES, AND IN THE APPLICA-
TION OF THE SAME FOR HEATING STRAM BOILER OR OTHER FURNACES."
PROVISIONAL SPECIFICATION left by the said Joseph Knott at the
Office of the Commissioners of Patents, with his Petition, on the
2nd December 1872.
I, JOSEPH KNOTT, of the Firm of Joseph Knott and Company, High-
field Steel Works, Sheffield, in the County of York, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN ECONOMIZING OR
UTILIZING THE WASTE HEAT FROM MELTING OR OTHER FURNACES, AND IN THE
APPLICATION OF THE SAME FOR HEATING STEAM BOILER OR OTHER FURNACES," to
be as follows:-
This Invention relates to those furnaces where a number are arranged
side by side, and the heat from them conveyed by vertical flues into a

page_text: "
chimney or stack," as it is commonly termed, and carried away with-
out further use, and my improvements consist in the application of this
heat, which is effected by the construction of other flues branching off
from each ordinary vertical flue in such manner that the heat will pass
from the melting furnaces into them, and thence pass under and round
the under side of the steam boiler, thus dispensing entirely with the
ordinary fire-box of the boiler, the waste heat from the furnaces being
sufficient to produce the effect required. After the heat has thus passed
under the boiler it is conveyed through the ordinary flue of the boiler
into the ordinary chimney of the boiler furnace.
I may arrange the boiler behind the melting furnaces either longi-
tudinally with them (which is preferable) or with the end placed
transversely and opposite to the centre furnace. When the boiler is
placed longitudinally with the furnaces I arrange or construct the first
flue branching from the furnace which is at or near to the end where
the fire-door is usually placed in such manner that it extends only a
little under the boiler and the flue that branches from the next furnace,
so that it extends further under and so on until the last extends across
and the heat passes down the opposite side of the boiler, and is then
conveyed into the ordinary flue of the boiler. I also construct these
flues with a slight curvature towards the first or end where the heat
passes into the ordinary boiler flue, by which arrangement I obtain an
equal draught to all the furnaces. When the end of the boiler is placed
transversely with the furnaces I construct the flue so that the heat will
pass under the boiler in a similar manner, only enter in at one end.
These improvements are also applicable to furnaces now in use, and
are effected by the insertion of a "damper" into each vertical flue of
the furnaces so that the heat will not pass away but be conveyed
through the flues provided for conveying it under and round the under
side of the boiler. I also apply vertical " dampers" to the said flues
which pass under the boiler so that I can regulate the draught of each
separately, or shut off the heat entirely if required, and by opening the
dampers" in the vertical flues the heat will then pass away as heretofore.
66
But in constructing new furnaces I construct or form a long flue for
carrying away the heat when not required for heating the boiler or other
furnace running longitudinally with and raised a little above the boiler
with the flues which branch from the furnaces arranged vice versâ to

page_text: their position when the heat has to pass under the boiler, that is, I
construct the flue longest that is farthest away from the opening at
which it enters the chimney of the boiler. I thus dispense with the
ordinary "stack" or series of long vertical flues now employed to convey
away the heat when not required to pass under the boiler.
their position when the heat has to pass under the boiler, that is, I
construct the flue longest that is farthest away from the opening at
which it enters the chimney of the boiler. I thus dispense with the
ordinary "stack" or series of long vertical flues now employed to convey
away the heat when not required to pass under the boiler.
By means of these improvements I am enabled to utilize the waste
heat produced from melting furnaces, to dispense with all smoke which
proceeds from ordinary steam boiler furnaces, and to economize fuel.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Joseph Knott in the Great Seal Patent Office on
the 29th May 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Joseph
KNOTT, of the Firm of Joseph Knott and Company, Highfield Steel
Works, Sheffield, in the County of York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent bearing date the Second day of December, in the year
of our Lord One thousand eight hundred and seventy-two, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Joseph Knott, Her special licence that I,
the said Joseph Knott, my executors, administrators, and assigns, or
such others as I, the said Joseph Knott, 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 "IMPROVEMENTS IN ECONOMIZING OR UTILIZING THE
WASTE HEAT FROM MELTING OR OTHER FURNACES, AND IN THE APPLICATION OF
THE SAME FOR HEATING STEAM BOILER OR OTHER FURNACES," upon the condition
(amongst others) that I, the said Joseph Knott, my executors or adminis-
trators, 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.

page_text: NOW KNOW YE, that I, the said Joseph Knott, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement and accompanying Sheets of Drawings:-
"
This Invention relates to those furnaces where a number are arranged
side by side, and the heat from them conveyed by vertical flues into a
chimney or stack," as it is commonly termed, and carried away with-
out further use. Now my improvements consist in the application of
this heat which has heretofore been wasted. This is effected by the
construction of other flues, branching off from each ordinary vertical
flue in such manner that the heat will pass from the melting furnaces
into them, and thence pass under and round the under side of the steam
boiler, thus enabling me to dispense entirely with the use of the ordinary
fire-box of the boiler, the waste heat from the furnaces being sufficient
to produce the effect required. After the heat has thus passed under
the boiler it is then conveyed through the ordinary flue of the boiler
into the ordinary chimney of the boiler furnace.
I may arrange the boiler behind the melting furnaces cither longi-
tudinally with them or with the end placed transversely and opposite to
the centre furnace. When the boiler is placed longitudinally with the
furnaces I arrange or construct the first flue branching from the furnace
which is at or near to the end where the fire-door is usually placed in
such manner that it extends only a little under the boiler, the flue that
branches from the next furnace I construct so that it extends further
under and so on, making each to extend further than the other until
the last extends across and the heat passes down the opposite side of the
boiler, and is then conveyed into the ordinary flue of the boiler. And
I construct these flues with a slight curvature towards the first or end
where the heat passes into the ordinary boiler flue; by this arrangement
of the flues I obtain an equal draught to all the furnaces. When the
end of the boiler is placed transversely with the furnaces I then con-
struct the flues so that the heat will pass under the boiler in a similar
manner, only enter in at one end.
"
These improvements are also applicable to the furnaces now in use,
and are effected by the insertion of a damper "into each vertical flue
of the furnaces; so that the heat will not pass away but be conveyed
through the flues provided for conveying it under and round the under

page_text: side of the boiler. I also apply "dampers" to the said flues which pass
under the boiler so that I can regulate the draught of each separately
or shut off the heat entirely if required, and by opening the dampers in
the vertical flues the heat will then pass away as heretofore.
But in case where new furnaces are constructed my improvements
consist in the construction of a long flue for carrying away the heat
when not required for heating the boiler or other furnace running
longitudinally with and raised a little above or below the boiler, with the
flues which branch from the furnaces arranged vice versa to their
position when the heat has to pass under the boiler, that is, I construct
the one longest that is furthest away from the opening at which it enters
the chimney of the boiler. I thus dispense with the ordinary "stack"
or series of long vertical flues now employed to convey away the heat
when not required to pass under the boiler.
.
By means of these improvements I am enabled to utilize the waste
heat produced from melting furnaces to dispense with all smoke
which proceeds from ordinary steam boiler furnaces, and to economizing
fuel.
Such being the nature and object of this my said Invention I will
now proceed to describe the same in detail, and in order that the
improvements may be more clearly understood I hereunto annex two
Sheets of Drawings, and have marked the same with figures and letters
of reference, the same letters referring to the same part in the various
views or figures on their respective Sheets.
Fig. 1 is an elevation shewing the present constructed vertical stack
or chimney of a number of melting furnaces, with my arrangement of
flues, with the boiler placed longitudinally with the holes or the furnaces,
shewn in section, taken through the line A, B, in Fig. 3; Fig. 2 is a
vertical section of the same taken through the line C, D, in Fig. 3,
which is a plan view; Fig. 4 (Sheet two) is a plan view shewing my
improvements as applied with twenty-four furnaces or melting holes
with two boilers placed with the ends opposite to the centre holes of
each twelve; Fig. 5 is a section of part taken through the line A, B, in
Fig. 4; Fig. 6 is a longitudinal section of the same taken through the
line C, D, in Fig. 5; Fig. 7 is an end elevation of boiler.
A (Sheet one) is the stack or chimney; B is the boiler; C, the
ordinary boiler chimney; D are the flues which branch from the

page_text: ordinary vertical flues D', and which pass under and down the sides of
the boiler, the heat from the furnaces passing through them, and thence
into the flue E of the boiler, from whence it is conveyed away by the
chimney C or to other furnaces if required; F and, G are dampers, and
it will be observed that by closing the dampers F and opening the
dampers G that the heat will then pass into the flues D and heat the
boiler, the dampers being operated vice versa if the heat be not required
for heating the boiler or other furnace, these dampers F and G being
supplied to each of the vertical and flues D, whereby the heat can be
regulated to the boiler as required. The arrows indicate the direction
of the flues D, by which arrangement and direction an equal draught is
obtained to all the furnaces.
A, Fig. 4 (Sheet two) are the furnaces or melting holes, and I have
here shewn twenty-four of them in a line with each other, with two
steam boilers B placed with the ends opposite to the centre of each
twelve, but any number of furnaces may be employed and the boilers
placed nearer or further apart as required;. O is the brickwork or walls
that divide the flues C¹ of each furnace, and it will be seen that each is
made longer than the other, as in case where the boiler is placed longi-
tudinally with the furnaces, the heat passing under and down the sides
of the boilers B, and into the flues D. But as the ordinary "stack" or
series of vertical flues D' (Sheet one) are dispensed with, and the heat
may not be required for heating the boilers or other furnaces, a second
flue E (shewn in dotted lines in Fig. 4) is provided underneath the
series C¹ leading from the furnaces A for conveying the heat to the
reserve flue F which is in connection with the chimney G, vertical
dampers H are applied to flues of the furnaces, and horizontal dampers I
in the bottom of the flues C¹.
It will be readily seen that when the dampers H are closed and the
dampers I opened the heat from the furnaces will not then pass under,
down the sides, or through the flues D of the boilers, but will enter the
second flue E and pass away by the reserve flue F, and when the heat is
required to heat the boilers the dampers I are closed, and the dampers H
opened. Dampers J being also applied in the reserve flue F to regulate
the draught as required, dampers K may also be provided to regulate
the draught when the heat is required for heating the boilers L; is a
passage whereby the attendant can get to regulate the dampers I.

page_text: The arrows indicate the direction of the heat from the flues of the
furnaces A.
Fig. 7 is an end view of the boiler shewing the ordinary fire-doors or
place for feeding the boilers with fuel, and which may be used in case of
accident to or non-usage of the melting furnaces.
Having thus described the nature of my said Invention, and shewn by
Drawings how the same is to be or may be performed or carried into
practice, I would have it understood that I do not confine myself to the
precise details of construction as herein described and illustrated by the
accompanying Drawings as the same may be to a certain extent varied,
nor do I claim the application of heat from one furnace to another
generally, but what I claim as my Invention and believe to be new is,
the application of the waste heat from steel melting furnaces for heating
steam boiler or other furnaces in such manner that an equal draught
can be obtained to each in manner substantially as shewn and described.
In witness whereof, I, the said Joseph Knott, have hereunto set
my hand and seal, this Twenty-fourth day of May, in the year
of our Lord One thousand eight hundred and seventy-three.
Signed, sealed, and delivered by
the within named Joseph
Knott, in the presence of,
WM. WHITEHEAD,
Patent Agent,
Alliance Chambers,
Sheffield.
JOSEPH KNOTT. (L.S.)