Abstract: A coke oven battery of the type that is underfired with coke oven gas, wherein a system of horizontal bus flues and valve controls therefor is provided for controlling the supply of lean gas fuel, such as blast furnace gas or any other lean gas, selectively to the gas flues in heating zones of the coke oven chamber walls and the recirculation of waste gas therefrom, so as to achieve the optimum fuel consumption under varying bulk density conditions of the coal mass in the coke oven chamber from the coke side to the pusher side.

Abstract: A regenerative coke oven battery that produces a coke cake having a low vertical temperature differential throughout its mass. The heating flues are defined by header walls having ducts for air or lean gas and outlet slots incorporated along the vertical length of the header wall which slots connect the ducts with the flues. The flues are combined into groups connected at their upper ends with a horizontal bus channel which communicates by a cross-over duct with a similar horizontal bus channel on the opposite side of a coking chamber.

Abstract: Double heating flues are arranged transversely to the horizontal axes of coke oven chambers within heating walls therefor. Side walls between each double heating flue have an internal passageway in the lower part communicating by exit orifices at vertically-spaced locations with the heating flues at the opposite sides of the side wall. The lower parts of the side walls converge horizontally into side wall portions some of which abut against the vertical heating wall and others extend through the vertical heating wall in an alternating arrangement of superimposed bricks. The upper parts of the side walls extend into load-bearing contact with the roof for the coke oven chambers. In the heating walls, three identical stretcher bricks in each course interlock by tongue-and-groove abutment joints. The middle brick abuts in a symmetrical relation with a flue side wall.

Abstract: Vertical heating flues between adjacent coke oven chambers include rich-gas burners extending essentially to progressively increasing elevations in the flues in a manner such that the burner exit zones increase from flue-to-flue to a maximum elevation at the pusher side of each oven chamber. At the pusher side, the coke oven chamber has a minimum width which increases to a maximum width at the coke side where the rich-gas burners have exit zones at the lowest elevation in the heating flues. Such a rich-gas burner arrangement may additionally include rich-gas burners with exit zones at the soles of alternate heating flues while the remaining heating flues contain the burners extended to progressively increasing elevations. When the coke oven chambers are heated by twin-heating flues, the rich-gas burners extend vertically from the soles of only one heating flue in each of the twin-heating flues.

Abstract: A coke oven battery includes a plurality of coke ovens heated during certain time intervals and the heat supply being reduced subsequent to these time intervals. First valve means controls the flow of combustion air for the ovens and second valve means controls the flow of waste gases recovered from the ovens and recycled back to the ovens. A first primary activating means activates the first and second valve means. Third valve means controls the flow of decarbonizing air for the ovens and a second primary activating means activates the third valve means. Fourth valve means controls the pressure in the ovens and first auxiliary activating means activates the fourth valve means. Fifth valve means controls the flow of fuel for the ovens and second auxiliary activating means activates the fifth valve means. The coke ovens may be arranged in groups so that the coking conditions at any time are the same for all ovens of a given group.

Abstract: A machine for reversing the heating cycle of a coke oven battery includes mechanism to lock out either one of two reversing rods in proper time sequence so that only three of the normal four reversing rods are operable for the selected mode of underfiring of the battery. Shifting or change over can only be accomplished at the neutral position which occurs when all fuel gas to the battery is shut off. The shifting or change over initiates the change over of rich or lean underfiring gas and also is interlocked so that the main drive cannot operate until all change over functions are completed.

Abstract: Regenerative heating of a coke oven battery includes the combustion of lean gas and air in heating chambers disposed between the coking chambers or, alternatively, if desired, the combustion of rich gas and air in the heating chambers. Each heating chamber includes a plurality of header walls forming upgoing and downgoing heating flues. Each header wall includes at least one internal duct in open communication with a plurality of vertically-spaced exit ports at the common side of a header wall. The internal ducts receive either preheated air or preheated lean gas for combustion in a heating flue. The cross-sectional size of the exit ports to discharge air in a given heating flue increases upwardly from port to port along the header wall whereby the amount of air supplied at the sole and lower part of the heating flue is insufficient for complete combustion of the amount of lean gas supplied thereto.

Abstract: In one embodiment valve means are provided in the pipe connecting the fuel gas main and air supply main to the respective headers to simultaneously supply a portion of the air to the headers associated with the "on" flues and a portion of the air to the headers associated with the "off" flues. The air supplied to the headers associated with the "on" flues mixes with and dilutes the rich fuel gas to suppress the tendency to deposit carbon in the vertical riser ducts of the "on" flues. The air supplied to the headers associated with the "off" flues removes the carbonaceous material deposited in the vertical riser ducts of the "off" flues. In another embodiment induction or recirculation ducts are provided between the vertical riser ducts of interconnected flues to admix a portion of the waste gas from the "off" flues with the rich fuel gas flowing upwardly through the vertical riser ducts of the "on" flues.