IMPROVEMENTS IN REGENERATIVE COKE FURNACES
Year: 1883

page_text: LETTERS PATENT to Alfred Julius Boult of 323 High Holborn, in the County
of Middlesex, Engineer, for an Invention of "IMPROVEMENTS IN REGENERATIVE
COKE FURNACES" a communication to me from the "Schlesiche Kohlen und
Koks Werke" of Gottesberg in the German Empire
PROVISIONAL SPECIFICATION left by the said Alfred Julius Boult at the
Office of the Commissioners of Patents on the 31st December 1883.
ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex
Engineer "IMPROVEMENTS IN REGENERATIVE COKE-FURNACES" [a communication
to me from the "Schlesiche Kohlen und Koks Werke" of Gottesberg in the German
Empire]
This invention relates to the construction of a regenerative coke-furnace and is a
combination of an ordinary coke-furnace with a Siemen's regenerative furnace. By
these means not only a higher temperature may be obtained but also the recovery
of the tar and ammoniacal liquor which are set free.
The said invention may be practised as follows.
The whole of the apparatus consists chiefly of say three chambers two at the
base and one above and their accessories.
The top chamber is heated to redness and then filled with coal through suitable
charging holes in its top. The coal is then trimmed and the charging holes closed
by iron doors, these and the side doors of the furnace are then luted.
Gases are then generated and rise into a gas receiver where the tar settles and
then pass into a gas regenerating chamber which is formed in one of the compart-
ments at the base of the whole apparatus. There the gas becomes heated and rises
into the combustion space beneath the top chamber. For enabling combustion to
take place, air is drawn through a chamber where it is heated and also drawn into
the combustion space. The burning gas then passes into a series of chambers
formed by partitions in the top chamber and they then pass to the regenerators in
the base where they transmit the remainder of their heat to bricks loosely piled
therein. From there the gases pass to the chimney,

page_text: .
When the gases are sufficiently hot a valve is turned and the gases are caused to
take the opposite way.
When the coking of the coal is completed the doors at the sides of the coal
chamber are opened and the coke removed. The process as described may then be
recommenced.
.
As all the compartments in the top chamber or top part of the apparatus
communicate with the same gas receiver, it will be feasible by means of the tar
gathering therein to regulate the pressure of the gas in the chambers this is effected
by immersing the pipes conducting the gas to a greater or less extent. The excess
of gas flows over and is collected
An excess of pressure in the coke furnace is of importance as the quantity and
· quality of the yield in coke is seriously affected thereby
The regenerative system used is the same as that known as "Siemen's" and is
based on the same principles
.
The preliminary heating of the chambers is effected by generators in which gas
is produced and rises into the chambers. When these are sufficiently beated, the
generators are stopped and the process above mentioned commenced.
When repairs are required in any one part of the apparatus, such part is shut off
by suitable dampers, so that the repair of one part does not necessitate the stoppage
of the rest.
The gases are in the described construction removed from the furnace by their
own pressure but if desired mechanical exhaustion may be employed for the purpose
In the latter case the gases after separation of the tar, and ammoniacal liquor pass
back to the furnace and thence to the chimney.
Suitable valves or dampers control the direction in which the gases and air pass
through the apparatus.
When suitably modified, any kind of coking furnace may be used together with
the Siemen's regenerator.
In most cases the regenerating process is applied both to the gas and air
sometimes however to the air only and in the latter case the construction will be
correspondingly modified so that there will be no regenerating chambers for
the gas.

page_text: .
1884.
"
ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Engineer "IMPROVEMENTS IN REGENERATIVE COKE FURNACES A communication
to him from the " Schlesiche Kohlen und Koks Werke" of Gottesberg in the
German Empire
This construction-of-a-regenerative-Coke-furnace-is-a-combination-of-a-common
eoke-furnace
with-a-Siemens-regenerator.
By-it-not-only-is-a-higher-temperature
attained-but-the-tar-and-ammoniacal liquor-which-are-separated-are-recovered.
This invention relates to improvements in combining coke ovens with
regenerators.
I am aware that the combination of regenerators with coke ovens was known
before the date of this Patent but such combinations were never attended with
results which were considered to be fully satisfactory, as, for instance, the coking
was not equally effected, however, by the construction of ovens in accordance with
this Invention this disadvantage is almost, if not entirely, avoided by changing
the point of initial combustion so that the direction of the burning gases in contact
with the walls of the coking chambers is reversed and the most intense heat is
thereby alternately applied to each end of each coking chamber.
The drawings show in Figure 1 a vertical section of the furnace on line g h
figure 4.
Figure 2, vertical section on line ik of Figure 4.
Figure 3. Longitudinal section on a 1. 2. 3. 4 of Figure 1.
Figure 4. horizontal section on line e 1. 2. 3. 4. 5. 6. 7. 8 of figure 3.
Figure 5. Top view or plan of the furnace
Figures 6, 9 a modification of the coke ovens shown in which the removal of
the gases from the furnaces is effected either mechanically by suction or by the
pressure of the products of distillation
Figures 10, 13, a further modification of the cokefurnace in which only the air
is heated the gas being admitted or blown into the heating chamber without being
previously heated
The operation of the furnace shown in Figures 1.-5 is as follows.-
The furnaces are first heated to redness and coal is then introduced by means of
travelling funnels or the like and through the charging holes F and it is then
trimmed and straightned by iron rakes. The charging holes and side doors are
then closed by iron lids and all is carefully and tightly luted with loam.
The gases now evolved rise through G and G into the hydraulic main H, deposit
tar therein and then arrive through the tube W and the gas channel E¹ (or E as

page_text: the case may be) into the regenerator chamber (C or C¹) and thence through n¹ or n
into the combustion space or under the sole or bottom L¹ or L to render the process
of combustion possible atmospheric air, previously heated in B¹ or B and drawn in
through Y, is allowed to enter through m¹ or m and it meets the gases.
The gases are then ignited and spread into all the combustion chambers I.' or L
and K which by vertical or horizontal partitions are divided gas conduits so that
the products of combustion may be evenly distributed over the whole space.
From here they arrive by m and n or m¹ and n¹ into another pair of regenerators
B. C or B¹. C. where they yield up the last remnant of their heat to the loosely
stacked bricks and then escape through the passages D. E or D¹ E¹. into the
chimney R. Now when the spaces B. C. (or B¹. C¹ as the case may be) are
sufficiently heated and the other chambers say B¹ C¹ or B. C. sufficiently cooled,
lever Y¹ is rotated 90° and then the gases and air pass in the opposite direction
After the ccal is completely deprived of gas the furnace doors at both sides of
the chamber are opened and the finished coke is pushed out by machinery.
The chamber which has thus become empty is charged with fresh coal and the
described process begins afresh
As the outlet pipes G of all the chambers open into the main H the tar collecting
therein allows the gas pressure in the chambers to be raised to any desired degree
which will be obtained by a valve N being raised or lowered by means of a lever
or the like so that the mouths of the tubes dip to a suitable depth; the excess of
tar escapes through past the valve N into a collecting tank.
An excess of pressure in the coke furnace itself is of importance as the quantity
and quality of the yield of coke are materially influenced thereby.
The regenerative system is identical with that of Siemens and is based entirely
on the principles of the same.
"
The preliminary heating of the chambers is effected by the generators A in which
gases are evolved which rise through B. b G. c D. d into the gas regulator and
thence into the chambers. When the furnace chambers are sufficiently heated the
generators are stopped and the operations already described proceed.
If repairs are to be effected in one or more of the furnace chambers the inlets
and outlets m m¹n n¹ are closed by suitable dampers and the repair may be
effected without stoppage of the rest of the furnace.
In these regenerative coke furnaces (figures 1.-5) the gases are removed from
the furnaces by the pressure of the products of distillation themselves.
The gases may however equally well be removed by suction produced
mechanically say by an exhauster (Figures 6-9) In that case the gases are
drawn through pipe G to a condensing apparatus in which the tar and ammonical
liquor become condensed and they are then led back to the coke furnaces and
enter according to how the damper between the furnaces and the chimney is set
either through E' or E. When the position of the damper is such that the gas
enters at E¹ the air enters at D¹. The gas then passes through the regenerator C¹
heated at the last turn and the air into regenerator B¹ likewise heated at the
last turn. Under the sole L¹ the gas and air meet and the hot gases with the hot
air are burned under L' and in their further progress along the walls a and
under sole L The burnt hot gases then pass through the regenerators C and B
and thence through the channels E and D to the chimney.
The stones (arranged so as to form gratings) in the regenerators C and B are
highly heated by the hot gaseous products of combustion passing through the same
and when after a certain time the damper is reversed, the opposite path takes
place.
The gas coming from the condenser freed from tar and ammonia enters at E, the
air at D the gas passes through the hot generator C the air through the hot
generator B. The gas and air now pass along L and L' and through C' E¹
and B D respectively to the chimney and so on in accordance with the position of
the damper through the sole and the side walls of the furnace in one or the other
direction

page_text: in this combination figures-0-9) of Siemens regenerators with Coke furnaces it
is quite immaterial what the interior construction of the coke furnaces is or of what
system they are.
In the arrangement represented in Figure 1 the partitions are supposed to be
vertical they may however be horizontal as shown in Figures 6 and 7 or of a single
hollow space the side walls of which are connected by baffles as represented in
Figures 8 and 9. The coke furnace itself may be of any suitable construction
provided always that the damper may be so adjustable that the currents of
products of combustion will alternately pass in reverse directions through between
the coal receiving chambers
In the coke furnaces constructed as represented in Figures 1, 5 and 6, 9
regeneration takes place for the gases to be burnt as well as for the air required
for their combustion. In some cases it is preferable to regenerate the air only and
to allow the gases to be burnt without previous heating. Such an arrangement is
illustrated in figures 10-13.
Under the coke furnaces a single regenerator only is provided at each side
videlicet B on one side and B¹ on the other. The furnace gases pass from the coke
furnace through g into the tar-collector thence to the condensers and are by means
of an exhauster or of a chimney with a good draught drawn through the gas
supply pipe R or R¹ according to the adjustment of a cock in the main separate
small supply pipes G. G¹ lead under the furnace bottom from the pipes R. R¹.
Gas and air are supplied as follows
When the cock in the gas main is so adjusted that the gas passes to the supply
pipe R¹ then the Siemens valve of the air regenerator is so set that the air flows
from the regenerator B¹ into the bottom channel L¹ gas enters through the small
supply pipe G' into the channel L' and there burns with the hot air arriving from
the regenerator B¹. The hot gases of combustion then pass through the passages a
and L to the regenerator B which they heat and thence through D to the chimney.
At the next change the cock in the main and the air valve are reversed, the gas
flows through R and G to L where ignition is effected, the hot products of
combustion pass through a and L¹ B¹ and D¹ to the chimney and escape their path
being thus in one or the other directions according to the position of the gas-cock
and air valve.
The gas enters the furnace through the pipes G and G¹ with more or less.
pressure being forced into the same either through an exhauster or ventilator or
drawn in through a chimney. In the latter case the whole supply may take place
through massonary channels opening into each furnace.
The channels for regenerating the gas and air shown as below or in front of the
furnace may be arranged on the top thereof
Instead of making them in firebrick arranged to form gratings they may be
constructed with masonry of any suitable form extending the surface for the same
purpose and if not with a better result, yet not with an inferior one.
Even without being filled the channels will act by taking up and giving off heat
as regenerators. Moreover the alteration in the direction of the draught required
for regeneration need not be produced by a Siemen's valve, a Putsch's bell or
similar device but may be produced by the opening or closing of one or more
ordinary dampers placed between the regenerators at either side and the chimney.
It-is-only-requisite that the gas and air-should-flow through-the-channels in the
furnace-bottom-the-walls-both-once-from-one-side, burn therein-and go out at the
other taking the opposite-path-at-the-next-turn.
It is only requisite that the gases and air after being heated in the regenerators
should flow in a state of combustion through the channels or combustion flues at
the bottom and sides of the coking chambers first in one direction (that is from
one pair of regenerators) and subsequently in the reverse direction from the other
pair of regenerators.
Likewise Thus the combustion takes place alternately chiefly at one side and
then chiefly at the other.

page_text: Having now described this invention and the manner of performing the same as
communicated to me by my foreign correspondent what I claim is :-
First, The--combination--of--Siemens--Regenerators--with--ordinary--horizontal
coke-furnaces-in which the removal of the gases-from-the-chambers-(furnaces) is
effected, not by suction but by the pressure of the products of distillation the
regulation-of-this-pressure-allowing the prevention-of-an-excess-of-air-being-drawn
into-the-chambers; and-the-consequent burning of the product-all-for-the-purpose
of producing as far as possible uniform and high-temperatures-so-as-to-obtain a
good-product-in-the-possibly-shortest-time
Second, The--arrangement--as--shown--and--described--whereby the tar and
ammoniacal liquor or ammonia are removed before the-gas returns-to-the-com-
bustion-space-without-thereby injuring-the-main-product.
Third, The combination of Siemens regenerators-with-coke furnaces in which
the-removal-of-the-gases-from-the furnaces-is-effected-either-by-mechanical-suction
or-by-the-pressure-of the-products-of-distillation-themselves.
Fourth, The combination of Siemens-regenerators-with-coke-furnaces as men-
tioned-in-claims-1, 2 and 3, for the purpose of heating the air only whilst-the-gas
is-admitted-or-blown-into-the-furnaces-without-preliminary-heating
Fifth, The-employment-of-alternate-directions-of-draught-for-the-gases-flowing
through the passages of a coke furnace-in--such a manner that the gases pass
through-the-coking-chamber-once-in-one-direction-and-then-in-another-according
to-the position of the damper or other device employed for the purpose so-that
the passages serve alternately-for--the--conveyance of the escaping products of
combustion-and-the-next-time-for-conveying the gas-air-or-gas-and-air for-the-com-
bustion, moreover-the-arrangement-in-various-ways-of stacks of bricks-by-masonry
or-otherwise.
The construction and arrangement of coking ovens, substantially as hereinbefore
described,. consisting of the combination with ovens, (in which the distilled gases
or such portions of them as it is desirable to burn are utilised as the source of
heat for carrying on the process) of two pairs of regenerators for heating air and
the distilled guses (or two regenerators for heating air only) in such a manner
that each time the functions of the regenerators are reversed, the places of initial
combustion and the direction of the currents of burning gases through the combus-
tion flues are also reversed, the places of initial combustion being always at the
exits from that regenerator (or pair of regenerators) which for the time being is
yielding up its heat to the air (or air and gases) about to enter into combustion.
In witness whereof I the said Alfred Julius Boult have hereunto set my
hand and seal this thirtieth day of June in the year of Our Lord one
thousand eight hundred and eighty four
ג1 בזגגז.
BATTER
בזגוז
RED J. BOULT
("CIT)

page_text: LETTERS PATENT to Alfred Julius Boult of 323 High Holborn, in the County
"
of Middlesex, Engineer, for an Invention of "IMPROVEMENTS IN REGENERATIVE
COKE FURNACES a communication to me from the "Schlesiche Kohlen und
Koks Werke" of Gottesberg in the German Empire
PROVISIONAL SPECIFICATION left by the said Alfred Julius Boult at the
Office of the Commissioners of Patents on the 31st December 1883.
ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex
Engineer "IMPROVEMENTS IN REGENERATIVE COKE-FURNACES" [a communication
to me from the "Schlesiche Kohlen und Koks Werke" of Gottesberg in the German
Empire]
This invention relates to the construction of a regenerative coke-furnace and is a
combination of an ordinary coke-furnace with a Siemen's regenerative furnace. By
these means not only a higher temperature may be obtained but also the recovery
of the tar and ammoniacal liquor which are set free.
The said invention may be practised as follows.
The whole of the apparatus consists chiefly of say three chambers two at the
base and one above and their accessories.
The top chamber is heated to redness and then filled with coal through suitable
charging holes in its top. The coal is then trimmed and the charging holes closed
by iron doors, these and the side doors of the furnace are then luted.
Gases are then generated and rise into a gas receiver where the tar settles and
then pass into a gas regenerating chamber which is formed in one of the compart-
ments at the base of the whole apparatus. There the gas becomes heated and rises
into the combustion space beneath the top chamber. For enabling combustion to
take place, air is drawn through a chamber where it is heated and also drawn into
the combustion space. The burning gas then passes into a series of chambers
formed by partitions in the top chamber and they then pass to the regenerators in
the base where they transmit the remainder of their heat to bricks loosely piled
therein. From there the gases pass to the chimney.

page_text: When the gases are sufficiently hot a valve is turned and the gases are caused to
take the opposite way.
When the coking of the coal is completed the doors at the sides of the coal
chamber are opened and the coke removed. The process as described may then be
recommenced.
As all the compartments in the top chamber or top part of the apparatus
communicate with the same gas receiver, it will be feasible by means of the tar
gathering therein to regulate the pressure of the gas in the chambers this is effected
by immersing the pipes conducting the gas to a greater or less extent. The excess
of gas flows over and is collected
An excess of pressure in the coke furnace is of importance as the quantity and
quality of the yield in coke is seriously affected thereby
The regenerative system used is the same as that known as "Siemen's" and is
based on the same principles
The preliminary heating of the chambers is effected by generators in which gas
is produced and rises into the chambers. When these are sufficiently heated, the
generators are stopped and the process above inentioned.commenced.
When repairs are required in any one part of the apparatus, such part is shut off
by suitable dampers, so that the repair of one part does not necessitate the stoppage
of the rest.
The gases are in the described construction removed from the furnace by their
own pressure but if desired mechanical exhaustion may be employed for the purpose
In the latter case the gases after separation of the tar, and ammoniacal liquor pass
back to the furnace and thence to the chimney.
Suitable valves or dampers control the direction in which the gases and air pass
through the apparatus.
When suitably modified, any kind of coking furnace may be used together with
the Siemen's regenerator.
In most cases the regenerating process is applied both to the gas and air
sometimes however to the air only and in the latter case the construction will be
correspondingly modified so that there will be no regenerating chambers for
the gas.

page_text: Figures
amunication
1520 VYCH
the gases from the furnaces is effected either mechanicially by suction or by the
pressure of the products of distillation
Figures 10, 13, a further modification of the cokefurnace in which only the air
Is heated the gas being admitted or blown into the heating chamber without being
previously heated
The operation of the furnace shown in Figures 1.5 is as follows.―
The furnaces are first heated to redness and coal is then introduced by means of
travelling funnels or the like and through the charging holes F and it is then
trimined and straightned by iron rakes. The charging holes and side doors are
then closed by iron lids and all is carefully and tightly luted with loam.
The gases now evolved rise through G' and G into the hydraulic main H, deposit
tar therein and then arrive through the tube W and the gas channel E' (or E as
the case may be) into the regenerator chamber (C or C) and thence through n into
the combustion space or under the sole or bottom L to render the process of
combustion possible atmospheric air, previously heated in B₁ and drawn in
through Y, is allowed to enter through m' and it meets the gases.
•
The gases are then ignited and spread into áll the combustion chambers L and K
which by vertical or horizontal partitions are divided gas conduits so that the
products of combustion may be evenly distributed over the whole space.
From-here they arrive by m and n into another pair of regenerators B. C where
they yield up the last remnant of their heat to the loosely stacked bricks and then
escape through the passages D. E into the chimney R. Now when the spaces B. C.
(or B. C as the case may be) are sufficiently heated and the other chambers say
BC sufficiently cooled, lever Y¹ is rotated 90° and then the gases and air pass in
the opposite direction
After the coal is completely deprived of gas the furnace doors at both sides of
the chamber are opened and the fiuished coke is pushed out by machinery.
The chamber which has thus become empty is charged with fresh coal and the
described process begins afresh
As the outlet pipes G of all the chambers open into the main If the tar collecting"
therein allows the gas pressure in the chambers to be raised to any desired degree
which will be obtained by a valve N being raised or lowered by means of a lever

page_text: or the like so that the mouths of the tubes dip to a suitable depth; the excess of
tar escapes through past the valve N into a collecting tank.
I
An excess of pressure in the coke furnace itself is of importance as the quantity
and quality of the yield of coke are materially influenced thereby.
The regenerative system is identical with that of Siemens and is based entirely
on the principles of the same.
The preliminary heating of the chambers is effected by the generators A in which
gases are evolved which rise through B. C. D. into the gas regulator and thence
into the chambers. When the furnace chambers are sufficiently heated the
generators are stopped and the operations already described proceed.
If repairs are to be effected in one or more of the furnace chambers the inlets
and outlets m m¹n n¹ are closed by suitable dampers and the repair may be
effected without stoppage of the rest of the furnace.
In these regenerative coke furnaces (figures 1.-5) the gases are removed from
the furnaces by the pressure of the products of distillation themselves.
The gases may however equally well be removed by suction produced
mechanically say by an exhauster (Figures 6-9) In that case the gases are
drawn through pipe G to a condensing apparatus in which the tar and ammonical
liquor become condensed and they are then led back to the coke furnaces and
enter according to how the damper between the furnaces and the chimney is set
either through E' or E. When the position of the damper is such that the gas
enters at E¹ the air enters at D¹. The gas then passes through the regenerator C¹
heated at the last turn and the air into regenerator B¹ likewise heated at the
last turn. Under the sole L¹ the gas and air meet and the hot gases with the hot
air are burned under L' and in their further progress along the walls and
under sole L. The burnt hot gases then pass through the regenerators C and B
and thence through the channels E and D to the chimney.
The stones (arranged so as to form gratings) in the regenerators C and B are
highly heated by the hot gaseous products of combustion passing through the same
and when after a certain time the damper is reversed, the opposite path takes
place.
The gas coming from the condenser freed from tar and ammonia enters at E, the
air at D the gas passes through the hot generator C the air through the hot
generator B. The gas and air now pass along L and L' and through C E¹
and B D respectively to the chimney and so on in accordance with the position of
the damper through the sole and the side walls of the furnace in one or the other
direction
In this combination (figures 6-9) of Siemens regenerators with Coke furnaces it
is quite immaterial what the interior construction of the coke furnaces is or of what
system they are.
In the arrangement represented in Figure 1 the partitions are supposed to be
vertical they may however be horizontal as shown in Figures 6 and 7 or of a single
hollow space the side walls of which are connected by baffles as represented in
Figures and 9. The coke furnace itself may be of any suitable construction
provided always that the damper may be so adjustable that the currents of
products of combustion will alternately pass in reverse directions through the coal
receiving chambers
In the coke furnaces constructed as represented in Figures 1, 5 and 6, 9
regeneration takes place for the gases to be burnt as well as for the air required
for their combustion. In some cases it is preferable to regenerate the air only and
to allow the gases to be burnt without previous heating. Such an arrangement is
illustrated in figures 10-13.
Under the coke furnaces a single regenerator only is provided at each side
videlicet on one side and B¹ on the other. The furnace gases pass from the coke
furnace through g into the tar-collector thence to the condensers and are by means
of an exhauster or of a chimney with a good draught drawn through the gas

page_text: supply pipe R or R' according to the adjustment of a cock in the main separato
small supply pipes G. G₁ lead under the furnace bottom from the pipes R. R¹.
Gas and air are supplied as follows
.
When the cock in the gas main is so adjusted that the gas passes to the supply
pipe R then the Siemens valve of the air regenerator is so set that the air flows
from the regenerator B¹ into the bottom channel L¹ gas enters through the small
supply pipe G into the channel L' and there burns with the hot air arriving from
the regenerator B₁. The hot gases of combustion then pass through L to the
regenerator B which they heat and thence through D to the chimney.
At the next change the cock in the main and the air valve are reversed, the gas
flows through R and G to L where ignition is effected, the hot products of
combustion pass through a and L¹ B¹ and D¹ to the chimney and escape their path
being thus in one or the other directions according to the position of the gas-cock
and air valve.
The gas enters the furnace through the pipes G and G¹ with more or less
pressure being forced into the same either through an exhauster or ventilator or
drawn in through a chimney. In the latter case the whole supply may take place
through massonary channels opening into each furnace.
The channels for regenerating the gas and air shown as below or in front of the
furnace may be arranged on the top thereof
Instead of making them in firebrick arranged to form gratings they may be
constructed with masonry of any suitable form extending the surface for the same
purpose and if not with a better result, yet not with an inferior one.
Even without being filled the channels will act by taking up and giving off heat
as regenerators. Moreover the alteration in the direction of the draught required
for regeneration need not be produced by a Siemen's valve, a Putsch's bell or
similar device but may be produced by the opening or closing of one or more
ordinary dampers placed between the regenerators at either side and the chimney.
It only requisite that the gas and air should flow through the channels in the
furnace bottom the walls both once from one side, burn therein and go out at the
other taking the opposite path at the next turn.
Likewise the combustion takes place alternately chiefly at one side and then
chiefly at the other
Having now described this invention and the manner of performing the same as
communicated to me by my foreign correspondent what I claim is :-
First, The combination of Siemens Regenerators with ordinary horizontal coke
furnaces in which the removal of the gases from the chambers (furnaces) is effected,
not by suction but by the pressure of the products of distillation the regulation of
this pressure allowing the prevention of an excess of air being drawn into the
chambers, and the consequent burning of the product all for the purpose of
producing as far as possible uniform and high temperatures so as to obtain a good
product in the possibly shortest time
Second, The arrangement as shown and described whereby the tar and
ammoniacal liquor or ammonia are removed before the gas returns to the
combustion space without thereby injuring the main product.
Third, The combination of Siemens regenerators with coke furnaces in which
the removal of the gases from the furnaces is effected either by mechanical suction
or by the pressure of the products of distillation themselves.
Fourth, The combination of Siemens regenerators with coke furnaces as
mentioned in claims 1, 2 and 3, for the purpose of heating the air only whilst the
gas is admitted or blown into the furnaces without preliminary heating
Fifth, The employment of alternate directions of draught for the gases flowing
through the passages of a coke furnace in such a manner that the gases pass
through the coking chamber once in one direction and then in another according to
the position of the damper or other device employed for the purpose so that the
passages serve alternately for the conveyance of the escaping products of combustion

page_text: and the next time for conveying the gas air or gas and air for the combustion,
moreover the arrangement in various ways of stacks of bricks by masonry or
otherwise.
In witness whereof I the said Alfred Julius Boult have hereunto set my hand
and seal this thirtieth day of June in the year of Our Lord one thousand eight
hundred and eighty four
ALFRED J. BOULT (LS.)