US1553662A - Coking-retort oven - Google Patents

Description

Sept. 15, 1925. 1,553,662

' J. BECKER COKING RETORT OVEN Filed June 11, 1921 8 Sheets-Sheet 1 Sept. 15, 1925.

J. BECKER COKING RETORT OVEN Filed June 11, 1921 8 Sheets-Sheet 2 a E M, /%Ww SE 077 ON Sept. 15, 1925. 1,553,662

J. BECKER COKING RETORT OVEN Filed June 11, 1921 8 SheetS -She'et 5 COKE PUSHER SEG77ON B B v f wa zi ofle Sept. 15, 1925.

.1. BECKER I COKING RETORT OVEN 8 Sheets-Sheet 4' 'Filed June 11, 1921 SEc r/ ON \LSECTION SECTION Sept- 15, 1925.

J. BECKER COKING RETQRT OVEN Filed June 11, 1921 8 Sheets-$heet 5 Sept. 15, 1925.

J. BECK-ER COKING RETORT OVEN Sept. 15, 1925. I 1,553,662

J. BECKER COKING RETORT OVEN Filed June 11, 1921 8 Sheets-Sheet 7 Sept. 15, 1925.

J. BECKER COKING RETORT QVEN Filed June 11, 1921 8 Sheets-Sheet s tmimsl ECT/ON Patented Sept. 15, 1925.

UNITED STATES 1,553,662 PATENT OFFICE.

JOSEPH BECKER,OI PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE KOPIERS COM- PANY, OI PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

COKING-RETORT OVEN.

Application filed June 11, 1921.

To all whom it may concern.

Be it known that I, JOSEPH BECKER, a

citizen of the United States, residing in Pittsbur h, in the county of Allegheny and State of ennsylvania, have invented a new and useful Improvement in Coking-Retort Ovens, of which the following is a specification.

This invention comprehends improvements of general utility in the coking retort oven art; and also comprehends certain improvements especially applicable to coking retort ovens of the well-known cross-regenerative type exemplified in the patent to H. Koppers No. 818,033, dated April 19, 1906.

The invention has for objects the provision of'a coking retort oven, having, as important characteristics: a construction that is especially adapted to small coking plants, in that it provides a regenerator construction that permits control of the flow through the regenerators and through the flame flues to be effected entirely from one side of. the battery with the required flexibility of operation essential for employment ofthe combination oven principle, whilepreventing short circuiting of the flowing medium from one regenerator into another; and, as a fea ture that may be secured by the above structural means, a novel system of control of the flow through the flame fines of the heating walls, permitting flow in the same direction through all the flame fines of each heating wall, with discharge of the flow from the I burning flues into the outflow operating flues at points loca ed remotely from the gas or distillate outl ts of the coking chambers, with the result that the hot waste gases are carried away from the valuable distillates flowing to the collecting main and overheating and destruction of the distillates are checked. I

Moreover, the improved flue construction permits an increase in the height of the flame flues, with a corresponding increase in the height of the coking chambers so that the latter may be made narrower in width, a development greatly facilitating the coking of high volatile coals with adequate coking capacity in small coking plants, and

while having adequate provision of taking care of the increased volume of combustion products, without making it necessary to enlarge the horizontal flue dimensions to sizes inconsistent with adequate strength of troducing elements 0 Serial No. 476,677.

is furthermore of great importance in oven batteries fired with extraneously-derived gas, such as producer gas, since the employment of such gas results in an increased volume of combustion product and adequate flue space must be provided to collect and feed to the downflow operating flues this increased volume of combustion products. By the invention, the flue construction may be adequately accommodated to such increased volume of combustion roducts, without inweakness into the wall construction.

In addition to the general objects recited above, the invention contemplates a novel regenerator construction and system of flow therethrough and through the fines, promoting uniformity of distribution, and has for further objects such other improvements or advantages in construction and operation as are found to obtain in the structures and devices hereinafter described or claimed.

In the accompanying drawings, forming a part of this specification, and showing for purposes of exemplification, a preferred form and manner. in which the invention may be embodied and practiced but without limiting the claimed invention to such illustrative instance or instances: Figure 1 is a composite. side elevational view, looking on the opposite sides of a coke oven battery embodying features above specified and equipped with the improvements of the present invention;

Fig. 2 is a crosswise vertical section through the'coke oven battery, the view being taken longitudinally through a heatin wall anda regenerator, in planes indicated by the line A-A ofFig. 4;

Fig. 8 is a composite crosswise vertical looking toward the pusher side of the coke oven battery and showing partly in section and partly in elevation the valve control devices for controlling the flow through the regenerators and through the flues;

Fig. 7 is a plan view of the regenerator flow control devices shown in Fig. 6; and,

. Fig. 8 is an enlarged vertical sectional elevation 'taken transversely through the pusher side of the battery, in a plane indicated by the lineLL of Fig. 7.

The same characters of reference designate the same parts in each of the several views of the drawings.

In the embodiment illustrated in the drawings, the invention is incorporated in a small combination coke oven battery, i. e., a battery having provision for being operated'optionally with producer gas as the fuel or with coke oven gas. A small coke oven battery having these general features is described and claimed in my application for patent for a coking retortoven filed April 23, 1920, Serial No. 376.126, now Patent No. 1,416,322, dated May 16, 1922. For convenience, the present descriptibn will be confined to the present embodiment of the invention in such a combination oven battery; the novel feaures and improvements made by the invention are, however, susceptible of other applications, such, for examle, as ordinary so-called coke ovens employing coke oven gas as the fuel, or ordinary so-called gas ovens employing producer gas as the fuel: hence the scope of the invention is not confined to the specific use and specific embodiment herein described as an illustrative example.

Referring to the drawings: there are illustrated views of a coke oven battery or plant of the I by-product type, having features above specified: said oven battery'embodies in its construction .a plurality of crosswise elongated heating walls 11. 11 and a plurality of intermediate crosswise elongated vertical coking chambers 12. 12. The heating walls 11 form the side walls of the respective coking chambers 12, as shown more particularly in'Figs. 1 and 4, and, in the presentinstance, are directly, supported by the heavy supportingpillar walls 13, 13 which extend crosswise of the battery and are located, as shown in Fig. 4 beneath the respective heating walls 11, 11. These pillar walls. together with other walls hereinafter described, collectively form the main support for the entire superstructure of the oven battery and are themselves supported upon a flat mat or platform which constitutes the sub-foundation on which the entire battery rests.

The coal to be coked is charged into the several coking chambers or ovens through charging holes 14 located in the top 15 of the oven battery and positioned directly above the ovens or chambers 12, as shown in Fig. 3. These charging holes 14 are equipped with the usual removable covers, which are removed during charging of the individual ovens or coking chambers and are-placed in positions to close the tops of such coking chambers during the entire coking or distilling operation. The gases of distillation pass from the tops of the several coking chambers 12 through gas outlets, the latter being in the present embodiment of the invention ilocated along the pusher side of the battery, and from said outlets 16 such gases pass through the usual ascension pipes (not shown) into the usual gas collecting main which carries the distillation products to the by-product recovery apparatus. Heat for coking the charges of coal in the several ovens orehambers 12 is derived from the heating walls 11, which, as above mentioned extend crosswise of the battery at the sides of the coking chambers. Referring now more particullarly to Figs. 2, 4 and 5, each heatin tuted of a plurality of ame or combustion fiues 17. The flame fines of each heating wall are, in accordance with the invention, operatively disposedv into a single group, that is to say all of the flame fiues of each heating wall operate concurrently as upflow or downflow fiues, as will be hereinafter more fully explained. When the flame fines on one side of a coking chamber are burning, that is to say, operating for npflow, the flames fiues on the opposite side of the same coking chamber are operating for downfiow to permit exhaust of the waste gases. Consequently heating is maintained con tinuously from end to end on one side of a charge of coal in each coking chamber. the heat being applied to the full length of one side of each charge during an entire period and. then. after reversal. being applied to the full length of the opposite side of the charge until a subsequentreversal is effected. For convenience, the several inflow operating combustion fines of the heating walls are respectively designated by the reference character G and the several outflow operating combustion flues are respectively designated by the reference character H the series of outflow operating fiues alternating, as shown in Fig. 4;. with the inflow operating fiues.

The crosswise regenerators 18 of the retort oven or battery are located below the aforesaid heating walls 11 and the coking chambers 12, and. in the present instance, extended in parallelism between the pillar walls 13 and the other heavy supporting walls, hereinafter described. Each regener ator 18 is a chamber extending from side to side of the battery. said chamber containing open brickwork. commonly called checkerwork. and indicated at 20'. with a wall 11.is constidistributing sole channel 21 underneath such checkerwork, the channels forming the soles of such chambers and opening up into the checkerwork.

In the present embodiment of the invention, a heavy Vertical gas tight supportingwall 22 extends directly beneath thecoking chamber in parallelism between each two adjacent pillar walls 13 and such sup porting walls 22, the regenerators of each pair being located respectively on the op posite sides of pillar walls 13 and between adjacent supporting walls 22.. As shown the pairs G of regenerators alternate with the pairs H. The several walls 22 also have the function with the pillar walls 13 'of supporting the weight of the battery superstructure. The supporting wall construction provides two series of crosswise extending parallel gas tight load-carrying walls located below th coking chambers and intermediate the heating walls, the supporting walls of one series 13 being directly beneath the heating walls and the supporting walls of the other series 22 be ing directly beneath the coking chambers. The walls-22 which are beneath the coking chambers are constructed and function not as mere partitions commonly employed, but as true load-carrying gas-tight walls, permitting relatively different pressures to be maintained in the checkerwork chambers on the opposite sides of said walls, or the flow of different media in the checkerwork chamber separated by these walls, without leakages from one checkerwork chamber into another and without danger of 'miX- ing gases in the checker work chambers which must be kept separate in this region of the battery.

The several regenerators of the pairs G and H are heated, in alternation, by the hot combustion products that draw oil from the flame or combustion flues hereinbefore mentioned and then impart such heat to th medium that they feed into these flame lines. In the present instance the flow through the sefveral regencrators of the pairs G is maintained concurrently in the same direction, while the flow through the several regencrators of the pairs H is maintained concurrently in the opposite direction, that is to say,-when the flow is pass ing up through the regenerators G, downflow is being maintained concurrently through the several regenerators H. Each regenerator is provided with a series of ducts 23 all of which lead respectively to individual flame flues 17 of the same heating wall, whereas the ducts 23 of the other rcg'enerator between the same illar walls 13 lead respectively to individual 17 of the next adjacent heating wall, as clearly shownin Fig. 4-. With this con' struction, each flame flue 17 communicates the has at its top a port or by a pair of ducts 23 with adjacent separate regenerators of either the pairs G or the pairs H, and the flow through the regenerators G or H,'that are each respectively located on opposite sides of a pillar wall 13, is maintained concurrently in the same direction, that'is to say both said regenerators are either operating for inflow or for outflow. i

In the operation of the present embodiment of the invention, th entire series of flame flues 17 of each heating wall 11 is either burning or operating for downflow to convey waste products to the regenerators beneath and consequently the regenerators which are connnunicably connected with the said flues operate concurrently for flow in the same direction and in the same manner. The reversal in flow through the flame flues 17 on opposite sides of the coking chamber, and their communicably connected regenerators may thus be said to take place longitudinally of the oven battery, instead of transversely thereof, as has heretofore been a common practice in this art. The reversal of the oven is effected at the end of an operating period determined by practice, and by means of any preferred type of reversing mechanism. The function of such reversal is as follows: the regenerators that prior to the reversal 0 erated as inflow regenerators become outtlbw regenerators and the outflow operating regenerators become nflow operating regenerators; the upburning series of flues switches function with the downflow operating series of flues of the next adjacent heating wall, and the supply of gas is turned off from the previously upburning flues and turned on into means of the previously operating downburning flues.

Each flame fine 17 of each heating wall opening 2-1 for draft and the passage of combustion products or waste gases from the flame within the flue. These ports 24,0pen up, in their respective heating walls, into horizontal or bus lines 25 formedin the heating walls, and respectively connecting all of the combustion fines of their respective heating walls. Accord ing to the invention, there is in each heating wall one horizontal flue 25 which, as shown in Fig. 2, tapers from one end or extremity to the other in such manner that the smallest cross-sectional area of the fine is located on the same side of' the battery as that of the distillate-outlet 16 ot' the adjacent coking chamber 12. The tapering channel thus formed serves to distribute the flow equally through vthe several fines 17 with which such channel communicates. At its end of greatest cross sectional area, i. 0., its end that is remotely positioned from the distillateoutlet 16, the horizontal flue 25 of each heating wall is communicably connected with the horizontal flue of. the adjacent heating wall in the manner described and claimed in m prior U. S. Patent No. 1,374,546, dated April 12, 1921, e. g.by duct-means, preferably extending over the top of the coking chamber between the adjacent heating walls, such as the passageway 26 shown in Figs. 2, 3 and 4. Thus the entire flow from a heating wall, withinthe flues of which combustion is being maintained, passes from the horizontal channel of the burning flues over and into the horizontal channel of the downflow operating flues of the adjacent heating wall. Moreover, the point of passage of the waste gases from one heating wall into another is located remotely from the distillate-outlet of the adjacent coking chamber, thereby preventing concentration of heat in the region of distillate discharge and checkin decomposition or other injury to the valua le constituents of the distillate.

The draft through the ports 24 may be regulated by means of the usual movable dampers or sliding bricks 27, positioned in the ordinary way in the bottoms of the horizontal flues 25 and adapted to be reached by access flues 28 which extend from the top of the horizontal fiues 25 in each heating wall to the top 15 of the battery, there being an access flue positioned over each flame or combustion flue of each heating wall.

Extending crosswise of the battery in each pillar wall 13 and located beneaththe heating wall 11 thereabove is a gas supply channel 29. The several channels 29' are for the purpose of optionally supplying coke oven gas to the several flame fiues of the heating walls. For this purpose, each channel 29 communicates with the individual flues 17 of its corresponding heating wall by means of ducts 31 that lead from such channel 29 individuall into the bottom of individual flues. Wit in the several ducts are located the usual nozzles 32. e

The supply of coke ovengas to the channels 29 of the respective heating walls 11 is derived from a coke oven gas main 36, located in the present instance on the pusher side of the battery and extending longitudinally therealong, as shown in Fig. 6. Connected with said main 36 is a series of supply pipes 37 which terminate respectively in gas guns 39 that enter inlets of the channels 2.9 below the respective heating walls. The several supply pipes of the-series 37 are individually p)rovided with controlling valves 43 operable y valve-operating levers 44, said valve operating levers being controlled by reversing means, including the reversing cables or rods 33 or 45. In the operation of the battery, when burning coke oven gas as the fuel, the series of supply ipes 37 to-. gether with theirvcontrolling va ves and operatin levers 44 is disposed into two groups G* and H, the several devices of the group damper-operating G alternating with the several devices of the group H. The coke oven supply devices of the groups G correspond with the flues of the group G 'and the supply devices of the group H* correspond with the alternate fines of the group H. The, cables or rods 33 and 45 are controlled from a central reversing station, provided with the usual reversing machine, and, assuming that the oven is operating with coke oven gas, the said cables 33 and 45 are operated at each periodic reversal of the batter to adinit gas either to the group of supp y devices G or to the grou of sup ly devices H, it being understoo that on y one group of supply devices G or H is connected with the supply of gas from the main 36 during each operation of the reversing connections, 33 and 45, for the reason that only one group of flues G or H" operates',-during the interval between reversing periods as a burning group of flues. WVhile one group of flues operates for combustion, the other group is concurrently operating for outflow of the waste gases, as hereinbefore explained.

Referring now mare particularly to Figs. 6, 7 and 8, the sole channels 21 of the several regenerators 18 of both groups G and H, respectively communicate with flow boxes 52 located, according to the present embodiment of the invention, on

the pusher side of the oven battery. Extending longitudinally of the battery is an exhaust main orstack tunnel 54 which receives the waste gases or products of combustion exhausted from the several outflow operating regenerators and carries them to the usual stack. Each flow box 52 is provided with a port 55 leading to a channel 56 which opens up into the aforesaid stack tunnel 54. The several flow boxes 52 are respectively provided with mushroom-valve dampers 57 for opening and closing the ports 55 with respect to the stack tunnel 54 and these dampers 57 are operated by levers 58. The flow boxes 52 are, as shown, disposed into pairs G and H corresponding to the pairs of regenerators G and H and the damper-operating levers 58 of the flow boxes Gr are controlled andoperated by a reversing connection or cable 59 and similarly the damper operating levers of the flow boxes H are controlled and operated by a reversing connection 60. The reversing connections 59 and 60 lead to a reversing station, hereinabove mentioned, and are operated by reversing mechanism to open either the dampers of the several pairs of flowboxes H or the dampers of the several pairs of flow boxes G As shown in th drawing, the dampers of the pairs of flow boxes H are open whereas the dampers of the pairs of flow boxes G are closed, inasmuch as the regenerators H are shown as operating for levers 62 of the air boxes H are controlledand operated by a reversingfconnection 64. \Vhen operating with producer gas as the fuel, the levers 62 of one air box of each of the pairs G and H", such as the air boxes P are disconnected from their respective cables 63 and 64 and the lids 61 of the series of flow boxes P are fastened down by cleats 7 5, as shown in Fig. 7.

Also extending longitudinally of the battery on'the pusher side thereof is a producer gas main 68leading from a suitable source of supply of producer gas and adapted to be opened up to or, shut off from its source of supply by means of an operating controlling valve. Leading into each flow box of the series P is a producer gas supply pipe 76, said producer gas supplypipes being individually connected with the producer gas main 68 by means of vertical pipes77. The vertical pipes -.77 are provided with individual valves 78 for controlling the flow of producer gas into the supply pipes 76, with which such vertical pipes. 77 are connected. The supply pipes 76 are provided with operating valves 79 having levers 80. The levers 80 corresponding to the flow boxes P of the pairs G are con-trolled and operated by a reversing cable or connection 81, and

the levers 80 corresponding to the flow boxes P of the pairs H are controlled and operated by a reversing connection 82.

The operation of the coke'oven battery, when employing an extraneously derived special generator gas, such as ordinary producer gas as the fuel is as follows: The supply of coke oven gas to the coke oven gas main 36 is cut off andi the reversing connections of said main areleft idle. A supply of producer gas is however, turned on into the producer gas main 68 by opening the main valve of such producer gas main and the producer gas enters the vertical pipes 77 and passes into the branch pipes 76.0f either the producer gas flow boxes of the pairs G or of the pairs H Assuming that the several regenerators G are operating for inflow and the communicably connected flues G as burning flues, the reversing cables 81 and 63 are operated to permit roducer gas and air to flow into the flow oxes P and A of the pairs G the dampers 57 of said I air boxes being closed by the reversing connection 59. Concurrently the reversing connection 60 is operatedto open the dampproducer gas to ers of the flow boxes of the pairs H where by the latter operate as outflow boxes W and the cables 82 and 64 are concurrently operated to shut off the supply of air and the flow boxes H The producer gas thus flows into the regenerators P of the pairs G and passing through said regenerators is preheated before being delivered into the burning flame flues G. During the inflow of producer gas through said regenerators P waste gas from the down-burning fines is flowing out through the regenerators H that are operating as waste gas regenerators W. In the regenerators A of the pairs G inflow of air is maintained and passing outwardly through such regenerators finally enters the burning flarne fines to support the combustion of producer gas that is delivered thereto by the regenerators P. On reversal of the flow, by means of reverseoperation of the several connections hereinabove described from the reversing station, the inflow operating regenerators andflues become outflow regenerators and fines and concurrently the outflow regenerators and flues become inflow operating regenerators and flues.

Inoperating the battery with coke oven gas as the fuel, the supply of producer gas to the main 68 is shut off and air is permitted to flow into the regenerators P at each reversal in place of the producer gas. This is accomplished by connecting the lids 61 of such regenerators P with the reversing connections 63 and 64. During coke oven gas operation, a supply of coke oven gas is maintained in the channels 29 which The reversing feed the upburning flues. mechanism is operated at each reversal to place all of the inflow operating regenerators in communication with the outer air and concurrently all of the outflow operating regenerators in communication with the exhaust. Alternatively, during such coke oven gas operation, some of the regenerators, such as the regenerators P may be employed for conveying to the fines a neutral gaseous diluent such as return waste gas, to lengthen the flames in the flues, in the manner and for the purposes set forth in my co-pending application Serial No. 376,- 126 filed April 23, 1920, now Patent No. 1,416,322, dated May 16, 1922.

The invention as hereinabove set forth is embodied in a particular form of construction but may be variously embodied within the scope of the claims hereinafter made.

I claim:

1. In a coke ovenbattery, incombination: a plurality of coking chambers, each provided at one side of the battery with a dis- .tillate outlet; heating walls contiguous to tapered horizontal flue in each heating wall,

the horizontal flues respectively connecting the combustion flues of their respective heating walls; each horizontal flue being also communicably connected with the horizontal flue of an adjacent heating wall by outflowduct means located on the opposite side of the battery from the distillate outlet of the adjacent coking chamber; and individually regulable and reversible regenerators each extending crosswise of the battery from sideto side thereof such regenerators being communicably connected in pairs with the combustion flues of a single heating wall; sub stantially as specified.

2. In a coke oven battery, in combination: a plurality of coking chambers, each provided at one side of the battery with a distillate outlet; heating walls contiguous to such coking chambers and respectively constituted of vertical combustion flues; a

. tapered horizontal flue in each heating wall,

the horizontal flues respectively connecting the combustion flues of their respective heating walls; each horizontal flue being also communicably connected with the horizontal flue of an adjacent heating wall by outflowduct means located on the opposite side of the battery from the distillate outlet of the adjacent coking chamber; and individually regulable and reversible. regenerators each extending crosswise of the battery from side to side thereof, such regenerators being cominunicably connected with the combustion flues of the heating walls; substantially as specified.

3. In a coke oven battery, in combination: a plurality of coking chambers; heating walls contiguous to such coking chambers and respectively constituted of vertical cornbustion flues; a tapered horizontal flue in each heating wall, the horizontal flues respectively connecting the combustion flues of their respective heating walls; each horizontal flue being also communicably connected by outflow-duct means located at one end of said horizontal flue with the horizontal flue of an adjacent heating wall; and individually regulable and reversible regenerators eac extending crosswise of the battery from side to side thereof, such regenerators being communicably connected in pairs with the combustion flues of a single heating wall; substantially as specified.

4. In a cok oven battery, in combination: a plurality of coking chambers; heating walls contiguous to such coking chambers and respectively constituted of vertical coinbustion flues; a tapered horizontal flue in each heating wall, the horizontal flues re spectively connecting the combustion flues of their respective heating walls; each horizontal flue being also communicably connected by outflow-duct means located at one end of said horizontal flue with the horizont-al flue of an adjacent heating wall; and

individually regulable .and reversible regenerators each extending crosswise of the battery from side to side thereof, such regenerators being communicably connected with the combustion flues of the heating walls; substantially as specified.

5. In a coke oven battery, in combination: a plurality of coking chambers; heating walls contiguous to such coking chambers and respectively constituted of vertical combustion flues, all of the combustion flues of a heating wallbeing commnnicably connected with the combustion flues of an adjacent heating wall said communicating means comprising a bu flue having an outflow duct disposed at one end. thereof; and individually regulable and reversible regenerators each extending crosswise of the battery from side to side thereof, such regenerators .being communicably connected in pairs with the combustion flues of a single heating wall; substantially a specified.

6. In a coke oven battery, in combination: a plurality of coking chambers; heating walls contiguous to such coking chambers and respectively constituted of vertical com bustion flues, all of the combustion flues of a heating wall being communicably connected with the combustion flues of an adjacent heatin wall said communicating means comprising a bus flue having an outflow duct disposed at one end thereof; and individually regulable and reversible regenerators, each extending crosswise of the battery from side to side thereof, such regenerators being cominunicably connected with the combustion flues of the heating walls: sub: stantially as specified.

7. In acoke oven battery, in combination: a plurality of coking chambers, each provided with a distillate outlet; heating walls contiguous to such coking chambers and respectively constituted of vertical combustion flues; a horizontal flue-in each heating wall, the horizontal flues respectively connecting the combustion flues of their respective heating walls; each horizontal flue being communicably connected with the horizontal flue of an adjacent heating'wall by outflowduct mean located remotely from the distillate outlet of the adjacent coking chamber; and individually regulable and reversible regenerators communicahly connected with the combustion flues of the heating walls; substantially as s ecified.

8. In combination wit a coking chamber, flued heating walls respectively constituting the opposite sides of said coking chamber, the flues of the heating walls being communcably connected with each other by duct means each having an outflow duct at one end thereof. reversible means for maintaining combustion in alternation in such heating walls, and reversible rcgenerators extending from end to end of the coking chumher, the regenerators being jointly operable for conveying air to the said fines, or separetely operable for conveying air and an extraneousiy derived gas; substantially a specified.

9. In combination with a coking chamber, fined heating Walls respectively constituting the opposite sides of said coking chamber, the flues of the heating walls being communicably connected with .each. other by duct means, each havin an outflow duct at one end thereof, reversi le mean for maintaining combustion in alternation in such heating walls, and reversible regenerators extending from end to end of the coking chamber; substantially as specified.

10. In combination with a coking cham-v her, fined heating Walls respectively constituting the opposite sides of said coking chamber, the fines of the heating Walls being coinmunicahly connected with each other by duct means extending over the top of the cokingchainber, each of said connecting ducts being provided with an outflow duct disposed at one end thereof, reversible means for maintaining cornhustion in alternation in said heating Walls,the exhaust gases produced by the combustion in one heating well being drawn off through the other, and reversible regenerators extend ing from end t0 end of the coking chamber and respectively connected with said heating Walls; substantially as specified.

JOSEPH BECKER,

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