AN IMPROVED METHOD OF AND APPARATUS FOR BURNING COKE
Year: 1882

page_text: LETTERS PATENT to John Cropper of Brimington in the County of Derby,
Builder, for an invention of "AN IMPROVED METHOD OF AND APPARATUS
FOR BURNING COKE"
PROVISIONAL SPECIFICATION left by the said John Cropper at the Office
of the Commissioners of Patents on the 14th April 1882.
JOHN CROPPER of Brimington in the County of Derby Builder
METHOD OF AND APPARATUS FOR BURNING COKE,"
"AN IMPROVED
My invention relates to improvements in and connected with coke ovens, my
object being to produce a superior quality of coke rapidly and economically without
the aid of steam power or the use of cast iron-piping.
In carrying out my invention a single row of ovens may be used but I prefer to
use ovens of the ordinary beehive form built in double rows: between the rows
and near the lower part of the ovens 1 construct a chamber for heating the air
which I convey through side and cross flues and branches provided with dampers
to regulate its admission into the ovens I also provide flues under the ovens to
heat the oven bottoms 1 charge and discharge the ovens in the usual manner but
I use doors protected by firebrick with hinged bars for closing or firebrick slabs or
shutters hung by chains with or without balance weights; when the material is
lighted the external air enters the heating chamber through suitable openings
provided with dampers and passes through the side flues cross flues and branches
iuto the ovens; the air by this time having gained a very high temperature.
While in use the lining of the oven is so hot that when a fresh charge is put in
it is immediately ignited and by the admission of hot air it is quickly and most
effectually burned, and a much greater quantity of coke will be produced than by
an ordinary oven in the same time. Each set of ovens is provided with a chimney
to which the smoke passes from openings in the tops of the ovens and through a
flue or flues,

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Cropper in the Great Seal Patent Office on the 11th October
1882.
JOHN CROPPER of Brimington in the County of Derby Builder. "AN IMPROVED
METHOD OF AND APPARATUS FOR BURNING COKE."
My invention relates to improvements in and connected with coke ovens, my
object being to produce a superior quality of coke rapidly and economically without
the aid of steam power or the use of cast iron piping.
In carrying out my invention a single row of ovens may be used but I prefer to
-use ovens of the ordinary beehive form built in double rows: between the rows
and near the lower part-of-the-oxens I construct a chamber for heating the air
which I convey through side and-cross flues, and branches-provided_with_dampers
to regulate its admission into the ovens. I also provide flues under the ovens to
heat the oven bottoms I charge and discharge the ovens in the usual manner but
I use doors protected by firebrick with hinged bars for closing or fire brick slabs
or shutters hung by chains with or without balance weights: when the material is
lighted the external air enters -the-heating_chamber through suitable openings
provided with dampers and passes through the side flues, cross flues-and-branches
into the ovens: the air by this time having gained a very high temperature.
While in use the lining-of the oven is so hot that when a fresh charge is put in
it is immediately ignited and by the admission of-hot-air-it-is_quickly and most
effectually burned and a much greater quantity of coke will be produced than by-
an ordinary oven in the saine timo.
Each set of ovens is provided with a chimney to which the smoke passes from
openings in the tops of the ovens and through a flue or flues.
And in order that my invention may be fully understood and readily carried
into effect I will describe the accompanying sheet of drawings reference being
had to the figures and letters marked thereon.
Fig. 1 is a transverse section and Fig. 2 is a plan showing part of a double row
of coke ovens to which my invention is applied.
a a are the ovens bb are the smoke passages and c is the main smoke flue, these
parts are or may be of the ordinary construction: below the smoke passage 1 form
a chamber d (extending longitudinally between the ovens) for heating the air
which I admit to the chamber d through passages ce placed between the ovens:
the air is drawn from the chamber d through passages ff under the ovens (one
end of each passage f communicating with the chamber d and the other end with
a vertical passage g) then up the passages g into the longitudinal passages h and
through the passages which convey the air in a highly heated stato into the
upper part of the oven producing rapid and complete combustion of the carbonic
oxide given off by the charge, the heat from which greatly increases the temperature
of the dome of the ovens, thereby hastening the process of coking: the products of
combustion then pass through the passages bb and main flue c to the chimney.
I use dampers j to close the passages i and I also use covers or dampers to close
the passages e e when desired: dampers are also fitted at the top of the ovens to
close the passages bb. Passages may also be provided direct from the chambers d
to the passage h.
When the ovens are at work the chamber d is always very hot and when a
fresh charge is put in it has the advantage of obtaining heat from all the other
ovens at work.
As soon as the charge is ready for drawing the doors are opened and a jet of
water is played on to the red hot coke, this prevents it from burning and the

page_text: steam also carries off a great deal of the sulphur, but at the same time it cools the
floor of the oven very considerably and when it is recharged ths benefit of the hot
air passages ffis very great,-without them the bottom of the charge is the last
to get coked and there is always a certain amount of the charge which is useless
for this reason but with the passages ff the bottom hoats rapidly and coking
commences as soon there as at other parts.
There is a great saving of time by this process as much as fifty per cent is
gained easily, five tons of coke per week is about the usual quantity produced by
the common oven,-eight tons may be produced by this process.
Having stated the nature of my invention and described the manner of
performing the same.
I declare that I claim.
1. The combination with the ovens a of the air heating chamber d and tho
passages f, g, h, and i substantially as and for the purpose herein shown and
described.
2. The combination with the ovens a of the chamber d as shown and described.
3-The combination with the ovens a of the passages fas and for the purpose
shown and described.
In witness whereof I the said John Cropper have hereunto set my hand
and séal this seventh day of October One thousand oight hundred and
JOHN CROPPER (L.S.)