US2412484A - Underfhtep regenerative coke oven - Google Patents

Description

D66. 10, WETHLY UNDERFIRED REGENERATIVE COKE OVEN WITHOUT SOLE CHANNELS Filed Dec. 29, 1942 2 Sheets-Sheet l ATTORNEY Dec. 10, 1946. F, WE HLY 2,412,484

UNDERFIRED REGENERATIVE COKE OVEN WI"..OUT SOLE CHANNELS Filed Dec. 29, 1942 2 Sheets-Sheet, 2

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ATTORNEY Patented Dec. 10, 1946 UNDERFIBED BEGENERATIVE COKE OVEN WITHOUT SOLE CHANNELS Frans Wethly, Manhasaet, N. Y. Application December 29, 1942, Serial No. 470,455-

The general object of the present invention is to provide underflred regenerative coke ovenbatteries with improved means for supplying air and lean fuel gas to the battery regenerators for preheating therein and for withdrawing waste heating gases from said regenerators. More specifically, the object of the present invention is to improve an under-fired regenerative coke oven battery by dispensing with the usual regenerator sole channels formed in the lower portion of the coke oven brick work and providing, in lieu thereof, horizontal pipes extending transversely -of the battery in its basement space, andeach directly connected through a plurality of regulable branch pipes to the lower ends of respective regenerator sections directly above the different branch pipes. Each of said branch pipes is made regulable by the inclusion therein of a butterfly valve, or other suitable throttling device, accessible for ready adjustment by an operator in the basement space of the battery. In normal operation, each of said horizontal pipes serves alternately as an off-take conduit through which heating gases are withdrawn from the corresponding regenerator section by the battery stack, and as a supply conduit for atom lean gas passing into the corresponding section for preheating therein.

By thus eliminating the customary sole channels inthe oven brick work structure, I am able,

to reduce the height of the coke oven brick work mass in a battery having regenerators and coking chambers of customary size and proportions, by as much as two feet or so, and thus reduce the weight of the coke oven bricks required in a large, but not abnormally large, battery by as much as 1,000 tons. The brick work weight thus saved is many times the weight of the piping and valves substituted for the sole channels. While the use of the invention may well result in some increase in the height of the basement. space, and consequently in the length of the columns extending up through the basement space of the battery, the required increase in the column material required is small in comparison with the above mentioned reduction in the amount of coke oven brick work needed.

The distribution piping may be made in whole 8 Claims. (CL 2025-141) 2 I the distribution piping supply and off-take pipes and their branches connected to the regenerators as above described,

Y and the pipes through which rich fuel gas may be supplied to the heating flues through the usual channels in the regenerator division walls, is located in a shallow piping space directly beneath the batterydeck and between the latter and a subjacent wall of poor heat conductivity. Said 80 ferent flues of each heating wall,

substantially similar distribution of flow in the wall forms the ceiling of the'portion of the basement space in which the battery attendants move about in the performance of their usual regulatory and inspection duties, and forms an insulation barrier substantially minimizing the transmission of heat from the distribution piping and the underside of the battery deck to the portion of the basement space beneath the heat insulating wall. Advantageously, moreover, the said piping space is used in recuperatively heating the combustion air passed into the regenerators for regenerative preheating prior to its passage to the heating flues of the battery.

The invention is adapted for use in batteries of various types and permits of an especially desirable heat distribution in coke oven batteries in which the heating fiueand regenerator arrangement is such that the setting of said flow r ating devices which will eflect a proper distribution of flow in one direction among the difll insure a reverse direction through said flues. I

The various features of novelty which characterize my invention are pointed out with particularityin the claims annexed to and forming a part of this specification. For a better under,- standing of the invention, however, its advantages, and specific objects attained with its use,

or in part of metal or of ceramic material, "and is readily accessible for cleaning and leakage eliminating repairs needed to avoid interference with the proper distribution of the heating gas flow distribution, which the readily accessible valves or'other flow regulating devices in the branch pipes are adjusted to effect.

In a preferred form of the present invention,

reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and described preferred embodiments of the invention.

Of the drawings:

Fig, 1 is a partial vertical of a coke oven battery;

Fig. 2 is a section with its right and lefthand portions taken on the broken lines 2-2-2 and 22A-2A, respectively, of Fig. 1; and

Figs. 3 and .4 are partial longitudinal and transverse sections, respectively, of a battery of the cross-over type.

In Figs..1 and 2 of the drawings, I have illus- I trated the use of the present invention in an underflred regenerative coke oven battery having hairpin heating flues and of conventional type including the horizontal I longitudinal section and form, except in respect to the construction of the lower-portions of the regenerators and the conduit connections thereto. The coke oven brick work or mass A, constituting the bulk of the coke oven masonry, is supported on a deck or slab of reenforced concrete B. The latter is directly supported in turn by suitably spaced beams C carried by columns D which may be formed of steel or of reenforced concrete, and extend upward through the basement space E above the battery foundation and for which the deck forms a ceiling.

Horizontal coking chambers F extend transversely of the brick work A between the opposite sides of the battery, and alternate along 'the length of the battery with heating walls, each of the latter being formed with vertical flues G and alternating flues 9, all arranged in a row extending from one side of the battery to the other. Each flue G and an adjacent flue g are connected at their upper ends to form a twin or hairpin flue.

Pillar, or regenerator division walls H, extending transversely of the battery are arranged one bent th each coking chamber and one beneath each heating wall and form side walls of side by side regenerators I and i. The regenerators I are intended for use solely in preheating combustionair, but the regenerators i are adapted for optional use in heating either combustion air or lean gas, accordingly as the ovens are being heated by the combustion of coke oven gas or other rich gas which does not require preheating, or by the combustion of a lean gas such as blast furnace gas which does require preheating.

For convenience, I hereinafter refer to the adjacent heating wall by the corresponding duct I or i. The regenerator partition walls L may be formed in a known manner by portions of the checkerbrick stacked up in the regenerators, The checkerbrick mass in 'each cell is advantageously shaped to provide a shallow open space M at the bottom of the cell.

regenerators I as air regenerators, and to the regenerators i as gas regenerators. In the arair regenerators I alternate with pairs of gas regenerators 2'1 and each regenerator I is connected by individual ducts or channels I to each of the flues G in the two heating walls immediately adjacent the regenerator. Similarly, each regenerator i is connected by individual ducts i to each of the heating flues g in the two immediately adjacent heating walls.

In operation with rich fuel gas, each of the fiues G in a single heating wall receives rich fuel gas during those periods in which it is acting on a. combustion flue, through channels K in the subjacent pillar wall H and corresponding branches J from a rich gas distribution pipe J, extending transversely of the battery through the upper portion of the subjacent basement space. During the rich gas operation periods in which the fiues g in the same heating wall serve as combustion flues, they receive rich gas through corresponding channels K in the pillar wall H and branches 9" from a horizontal rich gas distribution pipe 9' located in the basement space of the battery along side the OLLI'GSDOIldlDg pipe J. The amount of gas supplied by each of said pipe branches J and a" is regulable by adjustment of a corresponding valve or other regulating device J In so far as above described, the coke 'oven battery shown in Figs. 1 and 2 is of known type, and includes nothing claimed as novel herein. In accordance with known practice, also, each of the regenerators I and i is separated by vertical partitions L into an end to end row of regenerator cells, sometimes called individual flue reof which is connected at its and only one, flue G or g in an generators, each upper end to one,

rangement shown inFigs. 1 and 2, the pairs of to the conduit provisions passing air and gas to be preheated into the regenerators, and for passing waste heating gases away from the regenerators. Said conduit provisions shown in Figs. 1 and 2, comprise piping in the basement space E including horizontal pipes N, one beneath and parallel to each air regenerator I and pipes n beneath and parallel to the different gas regenerators 2'. Each pipe N is provided with an individual conduit connection to the space M at the lower end of each of the regenerator cells into which the regenerator I above it is divided by its partitions L. Each such conduit connection comprises a branch pipe N extending vertically upward from the pipe N into a vertical passage way formed through the deck member B and through the thin brick work layer between the deck B and the space M of the corresponding regenerator section. Similar conduit connections extend between each pipe n and the spaces M of the sections of the regenerator i above the pipe. Each of the branch pipes N' and n includes an adjustable throttling or regulating device 0, which may advantageously be, and is shown as a butterfly valve.

The pipes N and 12 may be formed of metal or of ceramic tiles and in either event means are advantageously provided to prevent objectionable heat transmission from the pipes to the portion of the basement space beneath them. The desired heat insulating effect maybe obtained in a desirable manner by providing a heat insulating wall P beneath and closely adjacent to the undersides of the .pipes N and n. The wall P thus forms a ceiling for the portion of the basement space in which the oven attendants perform their regulatory andinspection duties, forms the floor or bottom wall of a shallow piping space PA beneath the deck B in which the distributing pipes. J, 7, J, 7", .N and n and the regulating device J and Care located. Advantageously, also, the space PA serves as a recuperative space in which the combustion 'air which is to be preheated in the regenerators, passes tothe regenerators, and in doing so absorbs heat from the pipes N and n, and their branches N and n, as well as from the underside of the deck B.

The wall P may be formed and supported in any convenient manner, but is advantageously formed and disposed to permit its ready removal and replacement in sections when necessary to facilitate repairs to the distribution piping. Advantageously, the wall P is formed with suitably located openings P which are normally closed by movable closure members P and through which the valves 0 and J are accessible for adlustment. In the desirable construction illustrated in Figs. 1 and 2, the wall P comprises edge to edge slabs of some suitable heat insulating material, which may well be of such light weight, heat insulating material as is commonly used to form the heat insulating outer portions of furnace walls. As shown, said slabs are supported on light metal beams P The latter extend between and have their ends supported by the deck supporting columns-D. The closure member P for the access openings P' in the wall P, may be small slabs which are formed of the in which the regenerators, connected to those' pipes, are operating as o regenerators, and

to supply combustion air or lean gas to said pipes for preheating in the regenerators connected- I thereto, when the latter are operating as on regenerator sole channels alternately to a waste 'heat tunnel and to the atmosphere. only in that the valves Q include no means for connecting the sole channel to the atmosphere. The valve 8 diagrammatically illustrated by way of example in Fig. 2, comprises a chamber s'in continuously open communication with the corresponding pipe 1:. Communication between the chamber 8' and space PA through an inlet passage .9 is controlled by a valve member s and communication between the chamber 8' and the lean gassupply.

main is controlled by a valve orcock s. In operation with lean gas fuel the member s remains continuously closed and the valve 3 is opened regenerators, may take any of the forms heretofore employed to withdraw heating gases from, and to supply combustible agents to be preheated to regenerators through their sole channels. Advantageously, however, the pipes N and n are arranged to draw combustion air directly from the space PA.

In the arrangement shown in Figs. 1 and 2, each of the pipes N and n is connected at one end to an individual reversing valve Q which alternately opens and closes communication between the pipe and a waste heat tunnel R. The latter extends longitudinally of the battery at one side of the latter, and leads to the usual chimney (not shown) for impressing draft suction on the battery heating system through the reversing valves Q and pipes N and n. As will be understood the valves Q connected to half of the pipes N and n are open or closed during the reversal periods in which the valves connected to the other pipes N and n are respectively closed v As shown in Figs. 1 and 2, the end of each pipe pipe n has its end remote from the waste heat tunnel R connected to an individual reversing valve s through which the last mentioned pipe end may be closed during one set of reversal periods, and during alternate reversal periods may be open either to the space PA or to a. lean gas supply main T. accordingly as the battery is being heated by the combustion of rich gas or lean gas, respectively. The major portion at least of the air thus drawn into the pipes N and n from the portion of the space PA adjacent one side of the battery, advantageously enters that space adjacent the opposite side of the battery. To that end the space PA may be open to the external atmosphere at the side of the battery adjacent the waste heat tunnel R or preferably, and as shown in Fig. 2, is in direct communication with the basement space through openings P in the portion of the wall P adjacent the waste heat tunnel R. As will be apparent, the leakage of a small portion of the combustion air into the space P through the openings P is not practically objectionable. i

As will be apparent, the above mentioned reversing valves, or now boxes as they are sometimes called, may take various forms, and may be'constructed and operated in accordance with Y the usual practices of the art. The valves Q, for example, may differ from the most usual type of reversing valve employed to connect coke oven and closed in regular alternation by the battery reversalmechanism at the ends of the successive reversal periods. In operation with rich fuel gas the valve 8 is closed and the member s is opened and closed by the battery reversing mechanism in regular alternation at the ends of successive reversal periods. The valves 8 are not rovided with inlets controlled by valves s, but otherwise may be exactly like the reversing'valves s.

The recuperative effect obtained by moving the combustion air through the space PA before passing it into the regenerators, is substantial, and makes it possible to obtain a suitably high thermal emciency and to maintain suitably high combustion temperatures with smaller regenerators than are required in batteries having the usual regenerator arrangements. The combustion air moving through the spacePA and the heat insulating wall P, cooperates to insure a.

relatively low rate of transfer of heat to the basement space below the wall P from the battery structure and apparatus above that wall. With the wall P formed of such readily available material as is now used extensively in the construction of the outer heat insulation portions of furnace walls, the wall P may be light in weight and relatively inexpensive to construct and to open up and replace, as may be required to give access to the distribution piping above the wall. With the combustion air drawn through the space PA above the wall and into the regenerators by the battery stack section, such leakage through the joints and cracks in the wall P as may occur, will be upward and will contribute to desirably low temperatures and good atmospheric conditions in the basement space beneath the wall.

The excess of the average air temperature in the space PA above the temperature 'of the external atmosphere, is sufllcient to desirably preheat the rich fuel gas supplied throughthe pipes J and N, so as to avoid objectionable accumulations of liquid condensate and naphthalene in the rich gas fuel supply piping without giving rise to any significant increase in cracking action on the'rich fuel gas as it passes through the hotter upper portions of the channels K.

During each reversal period in which the flues G of any heating wall are. serving as upflow combustion flues, the regenerator I and the regenerator i connected to those flues serve as on" regenerators I and i, the pipes N and n, and revers- I During this period of operation a N to the space PA, is adjusted to close that pipe 1 end, and each reversal valve s which previously connected one end of its associated pipe n to the space PA or to the lean gas supply main T, is then adjusted to close thatpipe end.

As those skilled in the art will understand, by suitable adjustments of the throttle valves in the associated branch pipes N and n, it is readily possible to maintain approximately the same constant pressure at the tops of the various flues G and g, and to maintain one approximately constant pressure at the bottom of each regenerator space supplying a preheated combustible agent,

.and another approximately constant pressure at the bottom of each regenerator space through which waste heating gases are passing.

The simplification of the coke oven structure and the reduction in the masonry weight and construction cost made possible by the use of the present invention, will be readily apparent to those skilled in the art. It will be apparent, also, that the pipes N and n, their branches N and n and the valves 0, may be cleaned and adjusted,

and operating defects which they may develop may be eliminated with relative ease if and when the need therefor arises.

The desirable uniformity of heat distribution obtainable with the apparatus illustrated in Figs. 1 and 2, cannot be obtained or approximated in any coke oven battery heretofore in use and including regulating provisions which are as simple, as accessible, and as readily operable as are the butterfly valves 0. The expression, "uniformity of heat distribution," as used herein, means such relative rates of heat transfer to a coking charge from difierent portions of the adjacent heating walls, as will complete the coking operation in approximately the same time of each portion. of the charge extending between said heating walls, re-

gardless of the distance of said portion from the top or end edges of the charge. Such uniformity of heat distribution requires a definite non-uniformity in the rates of heat supply by the vertical different flues in each heating wall, to make up for the heat radiation losses at the sides of the battery, and to compensate for the customary progressive increase inthe thickness of the charge from the pusher side to the coke" side of the battery. In general, therefore, the attainment of uniform heat distribution with the construction shown in Figs. 1 and 2, requires significant variations in the adjustment of different regulating valves 0 associated with each heating wall, so as to compensate for variations in velocity head and static pressure along the length of the pipes N and n, as well as to vary the rates of flow through the associated heating flues 81 accordance with their different heat output require ments'.

Especially good heat distribution results are obtainable by the use of an invention in a coke 8 flow through the associated regenerator spaces and flues, will also insure the proper distribution of downflow through those spaces and flues. The

coke oven shownin Figs. 1 and 2 is of such char- 1 each cross-over connection directly connects the upper end of a small group of side by side flues in an adjacent portion of'the heating wall at one side of the coking chamber to the upper ends of flues of a similarly located small group of side by side flues in the heating wall at the other side of the coking chamber. cross-over and heating flue arrangement shown in Figs. 3 and 4, each heating flue is formed with 28 vertical flues and has 7 cross-over connections GB. In consequence, each cross-over connection serves to directly connect four side by side flues in each heating wall to four side by side flues in an adjacent heating wall.

The regenerators of the battery shown in Figs. 3 and 4, comprise a pair of end to end gas regenerators i adjacent each end of the battery, a pair of end to end air regenerators I respectively alongside and immediately adjacent said pairs of regenerators i, and a plurality of sets oi? air and gasv regenerators intermediate the air regenerators I. Each of said intermediate sets of regenerators comprises a pair of end to end gas regenerators id and a pair of end to end air regenerators I at each side of the gas regenerators ia. Each heating flue GA is connected at its lower end to a corresponding air regenerator I and to a corresponding gas regenerator i or w. Each regenerator I andi is connected at its upper end to flues in one adjacent heating wall only, but each gas regenerator id is connected at its upper ends to the lower ends of heating flues GA in each of the two adjacent heating flues. Piping including the usual distribution pipes JA extending transversely of the battery in the basement space E,

' may be used to supply rich fuel gas to the heating In so far as above described, the battery shown in Figs. 3 and,4 is of well known type and form, and includes nothing claimed as 'novel herein. The air and gas regenerators shown in Figs. 3 and 4, however, are like those shown in Figs. 1 and 2, in that they include no sole channels formed in th coke oven brick work. Each of the regenerators of Figs. 3 and 4 receive air or lean gas to be preheated in the regenerator from, and discharges waste heating gases into a corresponding supply and ofitake conduit N or n which, as shown, is located in a recuperator chamber. PA like that shown in Figs. 1 and 2.

In the particular battery design shown in Figs. 3 and 4, there is a waste heat tunnel RA at each side of the battery, and the supply and ofitake conduits N are arranged in end to end pairs, as are the conduits n, and at each side of the battery there is a lean gas supply main TA. Each waste heat tunnel RA is connected to each of the adjacent conduits N by an individual reversinc valve QA, and each waste heat tunnel RA and each lean gas supply main TA is connected In the conventional auaasc to each of the adjacent conduits 11. through a corresponding reversing valv qa. In its construction and proportions, each reversing valve QA may be exactly lik the most usual time of reversing valve now in use to connect a coke oven regenerator sole channel alternately to a waste heat tunnel or to a source of combustion air, except that each valve QA has its combustion air inlet Q connected to the space PA. Similarly, each reversing valve qa differs from the most usual form of reversing valve employed to flow into and out of th sole channel of a coke 1o forms of the apparatus disclosed without departing from the spirit of my invention as set forth in I the appended claims, and that in some cases certain features of my invention may be used to advantage without a corresponding use oi other features.

Having now described my invention; what I claim as'new and desire to secure by Letters Patent, is:

oven regenerator which is optionally usable in preheating combustion air and lean fuel gas,

only in that each valve qa has its combustion air inlet a in communication with the space PA.

In the crossover type of oven shown in Figs. 3 and 4, all of th fiues GA in each heating wall serve simultaneously as upflow fiues or downfiow fiues. fuel gas each of the difierent flues GA in a heating wall may receive rich fuel gas during alternate reversal periods through an individual branch J or 7 including a regulating device J, from a single rich gas distribution pipe J or i.

In Figs. 3 and 4, each of the diflEerent regenerators I, i, and ia may advantageously be divided by partitions LA into a row of sections extending transversely of the battery, and each of said sections is directly connectedto th lower ends of four flues GA, which have their upper ends directly connected to a corresponding crossover section GB. Each of said regenerator sectlons is connected by a corresponding branchpipe N or n including a butterfly valve or other regulating device 0, to the corresponding conduit N or n.

Substantially the same advantages obtainable with the construction shown in Figs. 1 and 2, are obtainable with the construction shown in Figs. 3 and 4. With the construction shown in Figs. 3 and 4, as with that shown in Figs. 1 and 2, the adjustment of the associated regenerator supply regulating valves 0 which will insurle proper distribution of upflow among the different flues in each heatin wall, simultaneously serving In consequence, in operation with rich 1. A regenerative, underfired' coke oven battery, comprising a masonry oven and regenerator structure formed with horizontally elongated coking chambers extending transversely of the battery and with heating walls alongside the coking chambers and having vertical fiues and with regenerators beneath said chambers and heating walls and connected to the flues above them, supporting means for said structure comprising a foundation underlying and spaced away from the underside of said structure and a plurality of horizontally distributed portions ex tending upward from the foundation into supporting engagement with said structure, a horizontal heat insulating wall dividing the space between said structure and foundation into an upper air space'and a lower basement space forming a passageway extending transversely of the battery for substantially its full width and adapted for the use of battery attendants, a plurality of horizontal pipes ,located in said air space and extending transversely of the battery and each having a plurality of uprising branches distributed along its length and respectively connected to adjacent regenerator portions displaced from one another transversely of the battery, means for alternately supplying a combustion agent to and withdrawing products of combustion from the different regenerator portions through said pipes, said means being arranged as upflow flues, will also insure the proper distributlon 'of downfiow through those fiues when the fiow through them is reversed. This desirable result is insured in each arrangement by th fact that none of the fiow paths including the different fines-of a heating wall and the on? and off regenerator sections in series with the flues, comprises portions di'ssimilarly displaced from the sides of the battery to any significant extent. While in the arrangement shown in Figs. 3 and 4, each cross-over connection GB receives gases moving to it in parallel streams through four different fiues in one heating wall and distributes those gases among four fiues GB in an adjacent heating wall, the side by side flues in each group are close together. In consequence, the distribution of flow through them is not significantly affected by differences between the pressures in different portions of the connections to the ends of the fiues as it is, for example, in coke oven batteries of known type in which a considerable number of side by side vertical heating fiues are connected in parallel to a horizontal channel.

While in accordance with the provisions of the statutes, I have illustrated and described the best forms of embodiment of my invention now known to me, it will be apparent to, those skilled in the art that changes may be made in the to pass the combustion agent through each oi said pipes during regenerator reversal periods alternating with reversal periods in which prod-- nets of combustion are withdrawn from the last mentioned regenerator portions and arranged to pass the combustible agent through each of said pipes-during reversal periods in whichproducts of combustion ar being withdrawn through an adjacent pipe, whereby temperature differences between said pipes are reduced by 'thetransfer of heat through said air space from the more highly heated to the less highly heated pipes.

2. A coke oven battery as specified in claim 1,

including means accessible for adjustment by an attendant in said basement space-for regulating the distribution or flow-through the branches connected to each of said pipes.

3. A coke oven battery as specified in claim 1, in which the combustion agent passing to the regenerator portions through some at least of said pipes is air passing into said p'pes through said air space and thereby preheated.

' 4. A coke oven battery as specified in claim 1, including rich Iuel gas supply piping including regulating'devices located in said air space, and

in which said horizontal wall is formed with distributedopenings through which said adjusting devices may be adjusted.

5. -A coke oven battery'as specified in claim 1,

in which rich fuel gassupply piping and devices adjustable to regulate the supply or combustible g-asto the different fiues are located in said air space and in which said branches include regulating devices and in which said horizontal wall is 1 formed with distributed openings through which 76 said devices may be adjusted.

6. A regenerative underfired coke oven battery, comprising a masonry structure above a. basement space and formed with horizontally elongated coking chambers extending transversely of the battery, heating walls alongside the coking chambers and formed with vertical flues, and regenerators beneath said chambers andheating walls and connected to the said flues above them, pipes extending transversely of the battery beneath said structure and each having a plurality of uprising branches distributed along its length and connected to adjacent regenerator portions displaced from one another transversely of the battery, said branches having individual flow regulating means accessible for adjustment from the basement space, means for alternately passing in opposite directions through each of said pipes and its branches, a combustible agent to be preheated in/the regenerator portions connected to said branches, and heating gases withdrawn from said regenerator portions, means for supplying rich fuel gas to said flues comprising distribution pipes below said structure, uprising channels in said structure, and means below said structure for regulating the gas flow through said channels, and aheat insulating wall below the said structure and spaced away from the latter and separating the space beneath said structure into an upper chamber in-which said pipes are located, and a subj acent space forming the passageway for an oven attendant required for underfire operation.

7. In a regenerative underfired coke oven battery having a basement space and masonry above said space and formed with coking chambers extending transversely of the battery and with rows of vertical heating fiues alongside said cokbranches andaccessible for adjustment from said basementspace, said fiues being' connected at their upper ends to provide a plurality of flow paths each havin all of its portions substantially similarly displaced from the sides oi. the battery so that a setting of said flow regulating devices efiecting a proper distribution of flow in one direction among the diflerent fines of each heating wall may effect a substantially similar distribution of flow in the reverse direction through said fiues, and a horizontal partition separating the basement space into an upper chamber including said conduit and branches, and a lower passageway extending transversely of the battery substantially beneath each heating wall through which an oven attendant may move in adjusting the flow regulating devices in said branches.

8. A regenerative underflred coke oven battery as specified in claim 1, comprising reversing valves external to said basement space, to which the ends of said pipes are connected.

rRANs WETHLY.

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