IMPROVE. MENTS IN THE CONSTRUCTION OF COKE OVENS
Year: 1883

page_text: LETTERS PATENT to John Jameson of Akenside Hill in the City and County
of Newcastle-on-Tyne, Consulting Engineer, for an Invention of "IMPROVE.
MENTS IN THE CONSTRUCTION OF COKE OVENS
"
PROVISIONAL SPECIFICATION left by the said John Jameson at the Office
of the Commissioners of Patents on the 8th October 1883.
JOHN JAMESON of Akenside Hill, in the City and County of Newcastle-on-Tyne,
Consulting Engineer. IMPROVEMENTS IN THE CONSTRUCTION OF COKE OVENS,
I construct a double casing in certain parts of the oven (whether converted in
accordance with what is known as the Jameson process, for the recovery of bye
products of coal described in my patent N° 19478 or not) such casing being under
reduced pressure and intended to act as a trap against ingress of air into the oven
at undesired parts. That is to say I wish to guard against indraught of air
(whether arising from chimney draught or from the suction employed in the
process already referred to) through the more or less pervious material of the oven
and I accomplish this by double casing especially the parts where I desire to have
this protection and connecting the cavity formed by the casing, either with the
chimney draught or with other suction so as to produce approximately the same
diminution of pressure in the inside of the oven and in the cavity of the protecting
case and thus to stop or diminish the tendency to leakage.-I consider it sufficient
when the ovens are built side by side, and back to back to form this casing
without the outer walls or if they be new ovens, in the thickness of the outer walls
and extending into the ground so far as may be needed to prevent undue filtration
of air into the oven itself or adequately to diminish such infiltration, but with an
end oven or ovens standing alone I prefer to carry the double casing round the
exposed parts of the oven and up to the level of the top of the charge at least, and
I prefer to include in this protection the the built up door way of the oven that is
to say to form it double to nearly the height of the charge plastering both the

page_text: walls and connecting the cavity formed between them with the reduced pressure
which may be available. I may tie at intervals the double walls both of the oven
and the door way but I prefer to do this as little as possible so as to avoid
conduction of beat and the unequal strain and movement due to expansion. If
the casing be connected to chimney draught I may make these connections by pipes
at intervals along the range of ovens or by built flues in or upon the masonry or in
any other convenient way. I am thus enabled to diminish loss of heat and at
the same time to prevent the combustion of the incandescent coke due to the
infiltration of air at parts of the ovens where it should not be burned and thus to
obtain in equal circumstances an increased yield of coke as compared with the yield
of the unprotected oven.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Jameson in the Patent Office on the 7th April 1884.
JOHN JAMESON of Akenside Hill in the City and County of Newcastle-on-Tyne,
Consulting Engineer IMPROVEMENTS IN THE CONSTRUCTION OF COKE OVENS.
I construct a double casing in certain parts of the oven (whether converted in
accordance with what is known as the Jameson process for the recovery of bye
products of coal described in my patent No 19478 or not) such casing being under
reduced pressure and intended to act as a trap against ingress of air into the oven
at undesired parts.-That is to say I wish to guard against indraught of air
(whether arising from chimney draught or from the suction employed in the
process already referred to) through the more or less pervious material of the oven
and I accomplish this by double casing especially the parts where I desire to have
this protection and connecting the cavity formed by the casing, either with the
chimney draught or with other suction so as to produce approximately the same
diminution of pressure in the inside of the oven and in the cavity of the protecting
case and thus to stop or diminish the tendency to leakage. I consider it sufficient
when the ovens are built side by side and back to back to form this casing without
the outer walls, or if they be new ovens, in the thickness of the outer walls and
extending into the ground so far as may be needed to prevent undue filtration of
air into the oven itself or adequately to diminish such infiltration but with an end
oven or ovens standing alone I prefer to carry the double casing round the exposed
parts of the oven and up to the level of the top of the charge at least and I prefer
to include in this protection the built up door way of the oven, that is to say to
form it double to nearly the height of the charge plastering both the walls and
connecting the cavity formed between them with the reduced pressure which may
be available. I may tie at intervals the double walls both of the oven and the
door way, but I prefer to do this as little as possible so as to avoid conduction of
heat and the unequal strain and movement due to expansion.-If the casing be
connected to chimney draught I may make these connections by pipes at intervals
along the range of ovens or by built flues in or upon the masonry or in any other
convenient way I am thus enabled to diminish loss of heat and at the same time
to prevent the combustion of the incandescent coke due to the infiltration of air
at parts of the ovens where it should not be burned and thus to obtain in equal
circumstances an increased yield of coke as compared with the yield of the
unprotected oven.
Having thus described the nature of my Invention I will proceed more
particularly to describe the manner of its application reference being had to the
drawings hereto attached.-Fig. 1 represents a section on the line A. B. of one
oven of a range of ovens, and Fig. 2 a horizontal section on the line C. D. Fig. 3.
is a plan wherein (the same letters applying to similar parts in each diagram)
E. E. is the body of the oven, F. the flue, G. G. the ordinary ovens walls and H.
the additional wall enclosing the space I, and J is the pipe connecting this space
with the flue. If the space be protected from ingress of air by the external wall
being moderately tight and the pipe connecting to the flue be of adequate size
there will be produced in the space I a slightly vacuuous condition corresponding to
the slightly vacuuous condition of the inside of the oven due to the chimney
draught and hence the tendency to suck air into the oven through the bricks walls
of the oven proper will be counteracted and air sucked through the outer wall will
be passed direct to the flue without consuming coke. I may also arrange to
couple the space between the walls direct with the upper part of the oven to
which it is attached so as to produce nearly the same effect by which means

page_text: air supplied to the oven from the space I is partially beated in the protecting
casing.
My invention may be further modified so as that the air leaking into the
protecting case may be passed into the upper part of certain ovens of a range and
excluded from others, that is to say by opening or closing openings provided
for the purpose, the main object being to prevent ingress of air by filtration
through the oven wall (and especially the wall of an old oven) into the oven at an
undesired time or in an undesired place, and thus to prevent unnecessary waste
of the coke.
Having now described the nature of my Invention and the manner of its
application I Claim: The use of a separate wall or casing to a coke oven enclosing
a space wherein the pressure of air outside the actual oven wall is made.
approximately equal to the pressure within the oven so as to stop or diminish
leakage of air into the charge in the oven substantially as described.
In Witness whereof I the said John Jameson have hereunto set my hand and
seal this Fifth day of April in the Year of our Lord, one thousand eight hundred
and eighty four.
Witness to the signature of John Jameson
JOHN BOWMER
Clerk
JOHN JAMESON
Forest Hall
(L.S.):