US3222260A - Heating of high chambered horizontal coke ovens - Google Patents

Description

Dec. 7, 1965 .1. BECKER 3,222,260

HEATING OF HIGH CHAMBERED HORIZONTAL COKE OVENS JOSEPH BECKER J mdf@ s A T'roRNEY 7 Sheets-Sheet 2 J. BECKER INVENTOR. ./osL-'PH BECKER blsArroR/ver HEATING OF HIGH CHAMBERED HORIZONTAL COKE OVENS Dec. 7, 1965 Filed Jan. 9, 1963 Dec. 7, 1965 J. BECKER 3,222,260

HEATING OF' HIGH CHAMBERED HORIZONTAL COKE OVENS Filed Jan. 9, 1963 '7 Sheets-Sheet 5 SECT/0N D-D INVENTOR. Jose/2H BECKER "is ,4 T ToRA/E Y Dec. 7, 1965 J, BECKER 3,222,260

HEATING OF HIGH CHAMBERED HORIZONTAL COKE OVENS Filed Jan. 9, 1963 '7 Sheets-Sheet 4 INVENTOR. JOSEPH BECKER ""'S ATTORNEY Dec. 7, 1965 J. BECKER 3,222,250

HEATING 0F HIGH CHAMBERED HORIZONTAL .COKE OVENS Filed Jan. 9, 1963 7 Sheets-Sheet 5 INVENTOR. ./OSEPH BECKER E "'s ATTORNEY Dec. 7, 1965 g, BECKER 3,222,260

HEATING 0F HIGH GHAMBERED HORIZONTAL COKE OVENS Filed Jan. 9, 1963 '7 Sheets-Sheet 6 SECT/NEE INVENTOR JOSE PH BECKER ms ATTORNEY Dec. 7, 1965 J. BECKER 3,222,250

HEATING OF HIGH CHAMBERED HORIZONTAL COKE OVENS Filed Jan. 9, 1963 '7 Sheets-Sheet '7 m5 A r 'rok/v5 Y United States Patent O 3,222,260 HEATING F HIGH CHAMBERED HORIZGNTAL CGKE VENS Joseph Becker, Pittsburgh, Pa., assignor to Koppers Company, Inc., a corporation of Delaware Filed Jan. 9, 1963, Ser. No. 250,336 6 Claims. (Cl. 202--12) This invention relates to improvements in the construction and general operation of regenerative horizontal coking retort ovens having coking chambers of substantial increase in height over the height of conventional coking chambers and employing both low burners and high burners in the flame-lines comprising the heating Walls, and more particularly, to the structuaal arrangement and operation for alternately burning gas in the high and low burners during each burning period in the ame-ilues substantially all of which have one high and one low burner in the same flue.

.A number of arrangements and proposals have been made with the primary object of substantially increasing the production capacity of byproduct coke ovens. However, to date, these attempts have for the most part been unsuccessful for the coke produced therein is not of that uniform quality required for those metallurgical processes, such as in blast furnace operation, wherein coke is an important component both because of its contribution to the chemical reaction and also because of its structural strength for supporting the overburden of ore, limestone and other coke. This metallurgical coke is now produced by coke ovens of conventional capacity wherein uniformity of heat distribution to the coals in the coking chamber has, over a period of fty years, been developed to a fine art.

In those instances in which the attempts for greater production have been based upon increasing the width of the coking chamber, it has been found that the requisite coking time is increased and the output of the oven per unit of time remains low.

In those attempts which have been made to increase oven capacity by increasing the height of the coking chamber, the greatest deterent has been the inability of the construction proposed to provide a uniform distribution of heat to the coal in these coking chambers of such increased height, because it has been found that the arrangements and relative disposition of the heating Wall components in those manners known in the art of conventional coke oven heating are neither directly applicable nor logically extensible to higher-than-conventional coke ovens.

Further, since it is uniformly recognized that higherthan-usual high burners are required to extend the heat of combustion to the upper regions of these taller ues, a very serious problem has arisen in connection with these latter attempts, that is, clogging of the riser passages to the high burners. This clogging occurs primarily in the region from the base of the flue to the high burner por-ts or nozzles and is caused by the deposition therein of carbon from the thermal decomposition of rich fuel gas being fed to the high burners. Since it is a distinct advantage to be able to operate coke ovens by burning rich gas in the flues, much Veffort has been expended toward seeking solutions to this serious maintenance problem which not only involves the expense and hazard of refurbishing the carbon-clogged risers but also seriously decreases the overall capacity of the oven by increasing 'the down time.

The primary object of the present invention is, therefore, the provision of improved structural arangements and operating procedures for by-product coke ovens, which improvements Will substantially increase the capacity of 3,222,260 Patented Dec. 7, 1965 ice the lcoke oven battery by providing a solution to the abovementioned problems vexing the industry.

In brief, to enable high capacity by-product coke ovens having coking chambers of a height exceeding that of conventional coking chambers by approximately fifty per cent to produce metallurgical coke, this invention consists of an arrangement of elements for the conduct of a process for heating a horizontal battery having a highlevel and low-level gas nozzles in each vertical flue (except perhaps the end ilues) whereby the high and low burners will not burn simultaneously but will burn alternately during each burning period.

By the exercise of this split in burning time between the high-level and the low-level burners it thereby becomes possible to start high-level lcombustion at that time during which the ue temperature is at its lowest value, just after the heating walls have reversed. This high-level combustion is self-initiating 'and there is no necessity for combustion at the low-level burners. Thus, by such operation the high-level burner riser passages are not exposed to the very high range of temperatures which occur in the tlues and the formation of carbon in the gas riser passages and/or gas burners nozzles, is thereby reduced. As will be described in greater detail below, during the period of operation of the low-level burners the supply of fuel gas t0 the high-level burner is discontinued and the .riser passages are actually being decarbonized when the flue temperatures reach their maximum value.

In the accompanying drawings forming part of this specilication, there are shown for purposes of illustration, both a gun flue red battery and an underjet battery, which batteries are of the Koppers Becker design (crossover flue interconnected combustion flue heating system) and contain those modifications to the control and distribution of fuel gas required in the practice of the present invention. In each instance, each ue shown contains both a high and a low burner. However, this invention -is not limited in its ,application to the specific types of ovens illustrated in the drawings, but is broadly applicable to the heating system for any cross-regenerative coking retort oven such as may employ the single-divided flue system or the double-divided ue system, so long as the means disclosed herein are provided and employed for separately feeding the high burners and the low burners, one of each being present in each ue, except perhaps in the end ues in each heating Wall.

FIG. l is a diagrammatic vertical section taken transversely of a coke oven battery employing gun-flue feed of rich fuel gas both to the high burners and to the low burners wherein are embodied the features of the present linvention yand wherein the left hand portion of FIG. 1 corresponds to a vertical section along line A-A of FIG. 2 and the right hand portion of FIG. 1 corre sponds to a vertical section along line B-B of FIG. 2;

FIG. 2 is a diagrammatic vertical section longitudinally of the gun-Hue battery illustrated in FIG. 1 and taken along the-line II-II thereof;

FIG. 3 is an elevational view of a portion of the distribution apparatus for simultaneously controlling the feed of fuel to the on burners and the feed of decar.- bonizing .air rto t-he off burners;

FIG. 4- is a vertical section taken transversely of an all-underjet battery employing decarbonizing air in place of waste gas recirculation and embodying the present invention wherein the left hand portion of FIG. 4 corresponds to a vertical section along line C-C of FIG. 5 and the right hand portion of FIG. 4 corresponds to a vertical section along line D--D of FIG. 5;

FIG. 5 is a partial vertical section longitudinally of the underjet battery illustrated in FIG. 4 and taken along line V-V to show the bution system;

FIGS. 6, 7 and S show the several active positions for the three-way distributing valve for fuel gas and decarbonizing air;

FIG. 9 is a vertical section taken transversely of an all underjet battery employing waste gas recirculation and embodying the present invention wherein the left hand portion of FIG. 9 corresponds to a vertical section along line E-E of FIG. 10 and the right hand portion of FIG. 9 corresponds to a vertical section along line FF of FIG. 10 and FIG. l is a of FIG. 9.

The coke oven battery illustrated in the accompanying drawings (FIGS. 1 and 2) comprises in general a plurality of coking chambers 11 and heating walls 12 that are disposed in alternation progressing in the lengthwise direction along battery 10. Heating walls 12 are made up of a series of vertical tlame-ues 13, which are individualized heating chambers, disposed in side-by-side relationship extending crosswise of battery 10. These vertical flame-flues 13 are arranged in groups in order to provide collective flow of the several ame-flues 13 in each group to a common crossover duct 14, whereby the combustion products of each flue flows upward, along common horizontal bus ue 16 for each such group of ilues, through duct 14 over the top of coking chamber 11 and down into the corresponding group of llame-fines 13 on the other side of the intermediate coking chamber 11. Thus, each crossover duct 14 can be considered as connecting two flow groups of flame-fines 13, one of each such pair of connected flow groups receiving for a period the waste combustion gases from the burning operation being conducted in the other group of the pair. At the end of this period the system is reversed and thereby the relative functions of these flow groups cyclically alternate.

Below the coking chambers 11 the oven are arranged a series of cross-regenerators 17 extending in a direction parallel to the series of vertical flame-dues 13 in each heating wall 12 and communicating directly therewith. This communication between llameilues 13 and cross-regenerators 17 is achieved through regenerator port and duct assemblies 18.

Although, as is typical for by-product coke ovens, the battery may be heated by the use of regeneratively preheated lean fuel gas, the illustration of this invention is primarily concerned with the operation during which heating ues 13 are underred with unpreheated rich fuel gas, such as coke oven gas. During such operation, Vall of the cross-regenerators 17 are employed to preheat combustion air to be delivered to llame-llues 13 through the port and duct assemblies 18. In those instances in which it is desired to underfre with lean gas supplementing the lean gas from the regenerators with an enriching mixture delivered through the distribution system described herein for rich gas underliring, this invention is equally applicable.

The regenerators 17 contain checker-brick and are divided, in the manner well-known in the art, into two sets which operate in alternation, one set receiving the hot combustion products leaving the off set of flameiiues 13 thereby to impart heat to the checker-brick therein and the other set simultaneously imparting the heat previously stored in checker-brick to the air passing therethrough during its passage to flame-flues 13. The air so heated reaches a temperature of at least 2000 F.

When the battery 10 is heated by rich fuel gas, which has higher caloriic value and therefore needs no preheating step for effecting coking temperatures quickly and reliably, this rich gas is delivered to the ame-flues 13 through a series of gas- gun ues 19, 21 running crosswise of battery 10 in the corbel region below the floor of heating wall 12.

fuel gas; air valving and distripartial vertical section taken on line X-X in the lower story of As shown, the gun liues are arranged in pairs with each gun flue 19 supplying fuel gas to all of the high burners 22 (one per flame-flue 13) in half an entire heating wall 12 and with each gun flue 21 supplying fuel gas to all of the low burners 23 (one in each llame-flue 13) along half an entire heating wall 12. However, as will be more completely Ideveloped below, whenever either one of each pair of gun flues 19, 21 is engaged in the delivery of fuel gas, the other gun flue of the pair is employed for delivering decarbonizing air. The supply of fuel gas to all of the pairs of gun ilues 19, 21 on the two sides of the battery 10 is provided by gas mains 24, 26 running longitudinally along either side of battery 10.

Thus, main 24 supplies fuel gas for every gun flue 19 and 21 along the entire pusher-side half of battery 10 while main 26 supplies fuel gas to every gun flue 19, 21 servicing the coke-side half of battery 10. Similarly disposed along the pusherand coke-sides of the battery are air conduits 27, 28.

The manner of distribution of both the fuel gas from main 24 and of the air from air conduit 27 (at which point the air is under pressure) to the pairs of gun ilues 19, 21 is most clearly illustrated in FIG. 3. Thus, depending upon the particular setting of valves 29, fuel gas may pass through pipe 31 and either pipe 32 or pipe 33 leading to gun tlues 19 and 21 respectively and, simultaneously, decarbonizing air will pass via conduit 34 and either pipe 33 and 32 leading to gun flues 21 and 19 respectively so as to alternate with the fuel gas feed.

In the arrangement in FIG. 3 disposition of the valve 29 to the far right of the three valve connections illustrated is shown servicing an off heating Wall and fuel gas cannot pass through the valve. Decarbonizing air is, however, free to pass both to gun flue 19 and to `gun flue 21. The disposition of the two valves 29 to the left of FIG. 3 are shown servicing two on heating walls which are separated, of course, by coking chamber 11. Through each of the latter valves 29, fuel gas is being supplied to the low burners of the on walls and decarbonizing air is being supplied to the high burners only of these same on walls; thus fuel gas will flow via pipes 31 and 33 to gun flue 21 and decarbonizing air will flow via pipes 34 and 32 to gun flue 19.

Reversing cables 37 and 38 are each connected by a plurality of lever arms 39 to the various valves 29 with alternate pairs of valves 29 being connected to one reversing cable and with the intermediate pairs of valves 29 connected to the other cable.

This valving and distribution arrangement as illustrated and described is for the express purpose of providing in a gun-flue battery having a high level and a low level gasv nozzle in each flame Hue means by which these two nozzles within each ilue will not burn simultaneously but will burn alternately during each burning or on period. For example, if battery 10 is being operated on thirty minute reverses, in any given flame-Hue 13 a first nozzle will burn for some definite time interval of perhaps eighteen minutes while air received under pressure at the air conduit 27 is conducted to the second burner nozzle in this flue. At the end of this period, the fuel feed to the first burner nozzle will be cut olf, fuel feed to the second nozzle will begin and the air will be supplied to the iirst nozzle. Then, during the remaining portion of the thirty minute cycle, that is for twelve minutes, the second nozzle will burn and the first nozzle will be decarbonized. The split intervals of burning time between the two burner nozzles can be set by the operator at his discretion to enable him to produce uniform temperatures over the side wall faces of the charge in the coking chamber 11.

Thus, as an illustration of oven battery operation with the present invention, considering half of heating wall 12 immediately after having been reversed to the on cycle, the appropriate reversing cable 37 or 38 will have been actuated to position valve 29 as shown in FIG. 6. With this positioning of the rotatable element of valve 29, pipe 31 leading from fuel gas main 24 (or 26) is placed in Comunication with pipe 32 leading to gas gun 19 and pipe 34 is placed in communication with pipe 33 leading to gas gun 21.

Thereafter, for some desired time interval, fuel gas will pass from the gas main, through pipe 31, valve 29, pipe 32, gas gun 19 and riser channels 41 to high burners 22. At the same time heated air will be supplied to the length of heating Wall 12 throughout the entire on period from regenerators 17 via port and duct assemblies 18 at a rate of flow determined by the position of air-port plugs 42. The incoming air from regenerators 17 has a temperature of about 2,000 F. and combustion is immediately initiated at the high burner and burning proceeds through the burning time interval. An important feature of this sequence of operation is the fact that exposure to high temperatures of the fuel gas passing through risers 41 is restricted to the lowest range of temperature which occurs in flame-flue 13 during the on period. Thereby the tendency of carbon to form in gas risers 41 as well as in the high burner nozzles 43 is reduced. At the culmination of the high burner burning interval the proper reversing cable 37 or 33 is actuated and lever arm 39 is moved counter-clockwise 90 to assume the position illustrated in FIG. 8 whereby for the balance of the reverse fuel gas passes from main 24 to low burners 23 via pipe 31, valve 29, pipe 33 and gun flue 21. Simultaneously with the redirection of the gas liow as described is the redirection of the decarbonizing air which enters valve 29 through pipe 34. This air will now be admitted to the high burners 22 through pipe 34, gun llue 19 and riser 41 throughout the burning period for low burners 23.

Thus, the burning cycle in any given vertical flame-flue 13 is split between the high burner and the low burner and while either one of these two burners is receiving fuel gas the other burner will be subject to decarbonizing action by pressurized air. Depending upon the type of battery, the pressure of the decarbonizing air at a point immediately preceding admission to valve 29 is in the range from 1/2 to 10" of water.

Upon completion of the reverse, lever arm 39 is rotated through a 45 sweep to assume the position shown in FIG. 7. In this position valve 29 prevents fuel gas from being fed to either of the gun flues connected to the off heating wall, while air is supplied to all burners in the off heating wall throughout the off period. At the same time in another heating wall located to one side `of the heating wall for which the on cycle has. been described above, the appropriate reversing cable 37, 38 adjusts the valve 29 controlling the distribution of fuel gas and air to this other wall whereby the latter heating wall begins its on portion of the reverse.

The same general process of operation described above in connection with an all gun flue battery is equally applicable to an all underjet battery as is illustrated in FIGS. 4 and 5. Battery 50 shown therein contains essentially the same elements of construction as have been described above in connection with the gun flue battery except that the gun ues 19 and 21 have been supplanted by the underjet nozzle and riser feed devices 59 (to high burner) and 61 (to low burner). Only the single gas main 64 shown extending along the pusher side of the battery is required. The gas distribution system from gas main 64 to the burners in vertical ame fiues 53, one high burner 62 and one low burner 63 in each flue 53, consists, in the case of the high burners 62, of pipes 71, 72, header 59a and riser 59. As shown, riser 59 extends upwardly through the regenerator wall and through the bottle brick in the tie wall separating adjoining flame ues 53 to high burner 62. In the case of low burners 63, distribution is effected via pipes 71, 73, header 61a `and riser 61 exflue 53 is split allotting separate and distinct time intervals for burning at the high burner 62 and for burning at the low burner 63, remains substantially the same as has been described in connection with the gun flue battery.

Decarbonizing air is supplied through conduit 67 and pipe 74 and fuel gas is supplied from the main 64 and pipes 71. As in the description for battery 10, this battery S0 although operable either by underring with regeneratively preheated lean fuel gas or with unheated rich fuel gas will be described in connection with the latter mode of fuel feed since this is the more likely application of this invention. As stated earlier, however, it is to be understood that this invention is also applicable [for feeding an enriching kmixture to the flues 4during lean gas underring.

In any given flame flue 53 during the on cycle, preheated air is admitted to the llame flue 53 from regenerators 57 through port and duct assemblies S8. Rich fuel gas is admitted through either the high burner 62 or the low burner 63 in the above described split sequence of operation through gas risers 59 and 61 respectively. Valves 69 are controlled by means -of lever arms 79 connected to one or the other of continuous reversing cables 77 and 78, rst, to connect the fuel gas main 64 to Asupply fuel gas to high burner 62 and simultaneously therewith to supply decarbonizing air to low burner 63; then to switch the supply of fuel gas from high burner 62 to low burner 63 and simultaneously therewith to provide decarbonizing air to high burner 62; and finally, at the end of the re- Verse, to shut off completely the supply of fuel gas to this given llame flue 53 but to continue the application of decarbonizing air to both high burner 62 and low burner 63 throughout the off portion of the reverse.

During the off portion `of the reverse the waste gas products of combustion from the corresponding flow group of on llame flues in the heating wall 52 on the opposite side of adjacent coking chamber 51 will enter these off ilues via crossover duct 54 and then will pass directly downward through the port and duct assemblies 58 to the regenerators 57 in the manner well known in the art.

In FIG. 5 the position of riser 61 relative to riser 59 varies proceeding from left to right in order to retain the position of riser S9 in the center of flue 52 with the arrangement of regenerator walls shown. With such an alternation of the positioning of these risers a simple arrangement of reversing cables which may be employed comprises two continuous cables 77 and 78. Alternate pairs of valves 69 will be connected to the same reversing cable and in any given pair of valves 69, one will be connected to the forward run (77 f or 787) of a given reversing cable and the [other will be connected to the rearward run (77r or 78r) of lthe given reversing cable thereby to compensate for the above-mentioned alternation.

Although the two constructions shown in FIGS. 1 through 5 represent in the first instance an all-gun flue battery, and in the second instance an all-under jet battery, this invention is equally applicable to a c-onstruction combining the gun flue and the underjet designs, which may be referred -to as a half gun-flue, half underjet design. In such a construction a gun flue would be employed to feed fuel gas to the high nozzles in the fashion illustrated in FIGS. l and 2 and underjet ducts would be employed to feed fuel gas to the low burners in the fashion shown in FIGS. 4 and 5. A valving and distributing mechanism similar to those disclosed in FIGS. 3 and 5 may be employed to provide for the alternate burning of the high and low burners in each flue and also, if desired, for the distribution of decarbonizing air to these burners during their off periods.

In those all-underjet batteries wherein provision is made for waste gas recirculation in the fashion well known in the art, air decarbonization need not be employed. Such construction is disclosed in FIGS. 9 and l0 in combination with means for practicing this invention.

In battery 90 a high burner 91 4and a low burner 92 is provided in each flame flue 93 with both high burners 91 and low burners 92 being supplied with fuel gas by way of underjet risers 94 and 96 respectively. Pairs of underjet risers 96 leading to adjacent ues 93 are interconnected by means of common chambers 97 in the region below the sole flues and the common chambers 97 to either side of any given coking chamber 98 are interconnected in pairs by means of waste gas recirculating ducts 99 in the conventional manner. In similar fashion waste gas recirculation for the high burners 91 is provided with common chambers 101 connecting pairs of risers 94 servicing adjacent flues 93 and with these common chambers 101 interconnected in pairs, one to either side of the coking chamber 98, by means of waste gas recirculating ducts 102.

Headers 94a and 96a respectively supply fuel gas to underjet risers 94 and 96 respectively, these headers 94a and 96a being connected via pipes 103 and 104 respectively to common supply pipe 106 leading from rich gas main 107. Valve 108 connected via lever arm 109 to continuous reversing cables 111 (111f and 111r) and 112 (112)t and 112r) provides for the operation of battery 90 as has been described in connection with split operation of the high and low burners in the underjet battery illustrated in FIGS. 4 and 5.

For the sake of standardization valve 108 may be the same threeway valve as valve 69 employed in the preceding constructions, the valve being modified by closing otf the air inlet pipe by means of a shut olf valve or by the use of a permanent cap.

It should be understood, of course, that the foregoing disclosure relates specically to only one operating cycle in order to illustrate the present invention but that the battery operators may in each given instance determine the optimum time intervals of split operation between the high and low burners for the particular battery design without departing from the spirit and scope of the invention as set forth in the appended claims.

What is claimed is:

1. In a horizontal coke oven battery including elements to provide uniform heating for high-chambered ovens, the combination comprising:

(a) paired groups of flame flues operable alternately in an on and off combustion condition;

(b) a high burner and low burner in each of said flues;

(c) a source of fuel gas connected to a fuel gas distributing system;

(d) a supply of air under pressure connected to an air distributing system;

(e) conduit means communicating said high burners;

(f) conduit means communicating said low burners;

and

(g) valve means connecting said high and low burner conduit means and said air and fuel gas distributing systems, operable to pass said air simultaneously and continually to said high and low burners when said ame flues are in the off combustion condition.

2. In a horizontal coke oven battery including elements to provide uniform heating for high-chambered ovens, the combination comprising:

(a) paired groups of flame flues operable alternately in -an on and olf combustion condition;

(b) a high burner and a low burner in each of said flues;

(c) a source of fuel gas connected to a fuel gas distributing system; n

(d) a supply of air under pressure connected to an air distributing system;

(e) conduit means communicating said high burners;

(f) conduit means communicating said low burners;

`and

(g) valve means connecting said high and low burner conduit means and said air and fuel gas distributing systems, operable to simultaneously pass said air to said low burners and said fuel gas to said high burn- 8 ers during a portion of the on combustion condition of said ame ues and operable to pass simultaneously and continually air to said high burners and said low burners during the off combustion condition of said flame ilues.

3. The invention set forth in claim 2 wherein:

(a) during another portion of said on combustion condition said valve means simultaneously passes said air to said high burners and said fuel gas to said low burners.

4. A method of underring a regenerative coke oven battery by means of a high and a low burner located in each vertical llame flue in the heating walls alongside the horizontal coking chambers, the low burners being at the base of the ues and the high burners being at a level above the lower burners, and cross-regenerators therefor being located underneath the coking chambers and heating walls, said method comprising:

(a) supplying fuel gas to the high burners in a given group of on flame flues during a portion of a given on period, and simultaneously (b) supplying regeneratively heated combustion air to said given on flame tlues for the entire given on period, and simultaneously (c) supplying decarbonizing air to the low burners in said given group of on llame fiues during said portion of said given on period;

(d) selectively controlling the rate of flow of the regeneratively heated air to said given on flame flues;

(e) discontinuing supplying the fuel gas to said high burners andthe decarbonizing air to said low burners, and thereafter (f) simultaneously supplying said fuel gas to said low burners and said decarbonizing air to said high burners during the remaining portion of said given on period;

(g) discontinuing supplying fuel gas and decarbonizing air to the high and low burners of said given group of flame flues during the o heating condition thereof; and

(h) simultaneously with such discontinuance, supplying decarbonizing air to both said high burners and said low burners during said off heating condition in said given group of llame ilues.

5. A method of underring a regenerative coke oven battery by means of a high and low burner located in each Vertical llame ue in the heating walls alongside the horizontal coking chambers, the l-ow burners being at the base of the ues and the high burners being at a level above the lower burners, and cross-regenerators therefor being located underneath the coking chambers and heating walls, said method comprising:

(a) supplying fuel gas to the high burners in a given group of on flame ues during a portion of a given on period, and simultaneously (b) supplying decarbonizing air to the low burners in said given group of on flame flues during said portion of said given on period;

(c) discontinuing supplying the fuel gas to said high burners and the decarbonizing air to said low burners, and thereafter (d) simultaneously supplying said fuel gas to said low burners and said decarbonizing air to said high burners during the remaining portion of said given on period;

(e) discontinuing supplying fuel gas and decarbonizing air to the high and low burners of said given group of flame ues during the off heating condition thereof; and

(f) simultaneously with such discontinuance, supplying decarbonizing air to both said high burners and said low burners during said off heating condition in said given group of flame tlues.

6. In the method of underring a regenerative coke oven battery by means of a high burner and a low burner located in each vertical flame ue in the heating Walls alongside the horizontal coking chambers, the low burners being at the base of the flues and the high burners being at a level above the low burners, the steps comprislng:

(a) supplying alternately fuel gas and decarbonizing air to said high burners during a given on heating period, and therewith simultaneously (b) supplying alternately decarbonizing air and fuel gas to said low burners during said on heating period; and thereafter (c) supplying simultaneously and continually decarhonizing air to `both `said high burners and said low burners during the off heating condition of said heating ilues.

References Cited by the Examiner UNITED STATES PATENTS MORRIS O. WOLK, Primary Examiner.

Claims (2)

1. IN A HORIZONTAL COKE OVEN BATTERY INCLUDING ELEMENT TO PROVIDE UNIFORM HEATING FOR HIGH-CHAMBERED OVEN THE COMBINATION COMPRISING: (A) PAIRED GROUPS OF FLAME FLUES OPERABLE ALTERNATELY IN AN "ON" AND "OFF" COMBUSTION CONDITION; (B) A HIGH BURNER AND LOW BURNER IN EACH OF SAID FLUE (C) A SOURCE OF DUEL GAS CONNECTED TO A FUEL GAS DISTRIBUTING SYSTEM; (D) A SUPPLY OF AIR UNDER PRESSURE CONNECTED TO AN A DISTRIBUTING SYSTEM; (E) CONDUIT MEANS COMMUNICATING SAID HIGH BURNER (F) CONDUIT MEANS COMMUNICATING SAID LOW BURNER AND (G) VALVE MEANS CONNECTING SAID HIGH AND LOW BURNER CONDUIT MEANS AND SAID AIR AND FUEL GAS DISTRIBUTION SYSTEMS, OPERABLE TO PASS SAID AIR SIMULTANEOUSLY AND CONTINUALLY TO SAID HIGH AND LOW BURNERS WHEN SAID FLAME FLUES ARE IN THE "OFF" COMBUSTION CONDITION.

6. IN THE METHOD OF UNDERFIRING A REGENERATIVE CO OVEN BATTERY BY MEANS OF A HIGH BURNER AND A LOW BURNER LOCATED IN EACH VERTICAL FLAME FLUE IN THE HEATING WAS ALONGSIDE THE HORIZONTAL COKING CHAMBERS, THE LOW BURNERS BEING AT THE BASE OF THE FLUES AND THE HIGH BURNERS BEING AT A LEVEL ABOVE THE LOW BURNERS, THE STEPS COMPRISING: (A) SUPPLYING ALTERNATELY FUEL GAS AND DECARBONIZING A TO SAID HIGH BURNERS DURING A GIVEN "ON" HEATING PERIOD, AND THEREWITH SIMULTANEOUSLY (B) SUPPLYING ALTERNATELY DECARBONIZING AIR AND FUEL GAS TO SAID LOW BURNERS DURING SAID "ON" HEATING PERIOD; AND THEREAFTER (C) SUPPLYING SIMULTANEOUSLY AND CONTINUALLY DECARBONIZING AIR TO BOTH SAID HIGH BURNERS AND SAID LOW BURNERS DURING THE "OFF" HEATING CONDITION OF SAID HEATING FLUES.

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