IMPROVEMENTS IN THE MODE OF UTILIZING THE WASTE HEAT OF COKE OVENS, AND IN THE CON- STRUCTION OF THEM.
Year: 1873

page_text: LETTERS PATENT to Alfred Jobson, of Darlington, in the County of
Durham, Colliery Agent, for the Invention of "IMPROVEMENTS IN THE
MODE OF UTILIZING THE WASTE HEAT OF COKE OVENS, AND IN THE CON-
STRUCTION OF THEM.
"
PROVISIONAL SPECIFICATION left by the said Alfred Jobson at the
Office of the Commissioners of Patents, with his Petition, on the
4th April 1878.
I, ALFRED JOBSON, of Darlington, in the County of Durham, Colliery
Agent, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN THE MODE OF UTILIZING THE WASTE HEAT OF COKE OVENS, AND IN THE
CONSTRUCTION OF THEM," to be as follows :-
My present Invention consists in certain improvements upon the
Invention for which former Letters Patent were granted to me on the
23rd day of February 1869, No. 558. In the Specification of the said
Patent I described the steam boiler or evaporating pan as being placed
over the coke oven, so that the products of combustion therefrom were

page_text: made available for generating steam or evaporating, by which arrange-
ment it is evident that when the charge from the coke oven was being
withdrawn and fresh coal put in, the boiler was deprived of most of the
heat, and could not be worked with regularity. Now my present
Invention consists in making the boiler or evaporator sufficiently long
to reach two coke ovens, which ovens are charged and drawn alter-
nately, so that a nearly uniform and much greater amount of heat
is supplied to the boiler. The products of combustion are applied
directly to the bottom of the boiler, or are conveyed between it and a
fire-brick arch of suitable length, and by external or internal flues
around and sometimes through the boiler, and thence to the chimney, or
a portion of the heat may be taken round the coke ovens by means of
flues in the walls in the ordinary manner, and dampers are provided in
the flues to divert the products of combustion from the coke ovens direct
to the chimney.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alfred Jobson in the Great Seal Patent Office on
the 3rd October 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALFRED
JOBSON, of Darlington, in the County of Durham, Colliery Agent, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourth day of April, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Alfred Jobson, Her special licence
that I, the said Alfred Jobson, my executors, administrators, and
assigns, or such others as I, the said Alfred Jobson, 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

page_text: Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
THE MODE OF UTILISING THE WASTE HEAT OF COKE OVENS, AND IN THE CON-
STRUCTION OF THEM," upon the condition (amongst others) that I, the said
Alfred Jobson, my executors or administrators, 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.
NOW KNOW YE, that I, the said Alfred Jobson, 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 (that is to say) :—
My present Invention consists in certain improvements upon the
Invention for which former Letters Patent were granted to me on the
Twenty-third day of February, One thousand eight hundred and sixty-
nine, Number 558. In the Specification of the said Patent I described
the steam boiler or evaporating pan as being placed over the coke oven,
so that the products of combustion therefrom were made available for
generating steam or evaporating, by which arrangement it is evident
that when the charge from the coke oven was being withdrawn and fresh
coal put in, the boiler or the evaporating pan was deprived of most of
the heat, and could not be worked with regularity. Now my present
Invention consists in making the boiler or evaporator sufficiently long
to reach over two coke ovens, which ovens are charged and drawn
alternately, so that a nearly uniform and much greater amount of heat
is supplied to the boiler or evaporator.
And in order that my Invention may be fully understood, and readily
carried into operation, I will proceed to describe the accompanying Sheet
of Drawings.
On Sheet 1 Fig. 1 represents a longitudinal section of two of the
improved coke ovens with movable bottoms constructed in the manner
described in the Specification of former Letters Patent granted to me on
the Twenty-third day of February, One thousand eight hundred and
sixty-nine, Number 558, to which my present improvements are applied;
Fig. 2 is a transverse section of the same. A, A, are the two coko
ovens, and B a steam boiler placed over both of them, and heated by
means of the flames arising from the combustion of the gases produced

page_text: in manufacturing the coke. The boiler B is provided with an internal
flue C, but any other description of boiler may be used. For the purpose
of slightly protecting the bottom of the boiler from excessive variations
of heat, and also for securing a portion of the radiation always obtained
in an ordinary coke oven to assist the proper manufacture of the coke,
I prefer generally to build fire-brick arches in the coke oven between
the coke and the boiler, as shewn at D. The length of these arches may
be varied according to the quality of the coal, and they may be pierced
with holes or have complete spaces between then.
In many cases upon the top of these arches I place bricks with
intervening spaces, or in channels made sufficiently wide, and supplied
with air to support combustion, so that a portion of the heat may be
retained and afterwards given off gradually from the mass of open
heated brickwork. The products of combustion after passing between
the ends of the arches D or through the perforations in the arches,
impinge against the under side of the boiler, and are then carried down
through the flues E, then along the side flues F, then up the end
flues G, and thence through apertures P, near the ends of the boiler into
the internal flue C, from which they pass to the chimney, as shewn by
the arrows. The coke oven is charged through the opening H, as
described in the former Patent above referred to, and the coal is levelled
in the ovens through the ordinary air holes M.
Instead of applying a steam boiler or generator to two coke ovens, as
above described, an evaporating pan of any description may be similarly
employed, and in some instances a steam boiler or evaporator heated
otherwise by the waste heat from ordinary coke ovens may be provided,
with a mass of similar chequered brickwork adjacent to or underneath
it, and properly walled round for the purpose described. The adjoining
ovens are charged at alternate times in order to maintain a greater
uniformity of heat under the boilers or evaporators; and to prevent any
unnecessary cooling down of the oven I prefer to cool the coke with
water after it has been drawn from the oven. When the steam which is
produced is temporarily not required, it may be led into any description
of condenser, and the water thus produced be again made use of for
feeding the boiler.
On Sheet 2 Fig. 3 is a longitudinal section, and Fig. 4, a transverse
section of a pair of coke ovens with a boiler above them, constructed
according to a modification of my Invention, In this instance, the

page_text: walls of the oven are made without flues, and the products of com-
bustion are carried through the spaces between the ends of the arches D,
or through perforations in the arches along the under side of the
boiler B, through the branch flues P into the main flue C, and thence
either direct to the chimney S or to the flue R, which is connected to
several ovens, and conveys the smoke to a main chimney.
The spaces between the arches and the under side of the boiler or
evaporating pan may be provided with bricks with intervening spaces, as
shewn in Figs. 1 and 2, or in narrow channels.
When a double-flued boiler is employed, each flue is connected by a
branch flue P placed near the outer end of the boiler to one of the coke
ovens. Should any of the water tube class of boilers be thus used, the
products of combustion can be conducted along the bottom of them, and
then amongst them, either from the top of the inner end of each oven,
or from the orifice of the coke oven side flues.
The above improvements are also applicable to other descriptions of
coke ovens in which movable bottoms are employed, and to coke ovens
of the ordinary construction.
Having thus stated the nature of my Invention, and described the
manner of performing the same, I declare that I claim,--
First. The improved modes of applying the products of combustion
from two coke ovens to one boiler or evaporating pan, as shewn and
described.
Secondly. The peculiar arrangements of the flues for conveying the
products of combustion from the coke ovens to the boiler or evaporating
pan, and the perforated brickwork or bricks with narrow intervening
channels placed under the boiler or evaporating pan, as shewn and
described.
In witness whercof, I, the said Alfred Jobson, have hereto set my
hand and seal. this Twenty-ninth day of September. One thousand