Double flue arrangement in heating walls for horizontal coke ovens

In a battery of coke ovens of the type heated regeneratively through the optional combustion of lean gas or rich gas in heating flues between coke oven chambers extending along spaced-apart horizontal axes, the improvement comprising:

• vertical heating walls at opposite sides of said coke oven chambers,
• a pair of regenerators arranged below each coke oven chamber to extend substantially the entire horizontal length thereof, one regenerator of each pair alternately preheating air for combustion and receiving burnt gases of combustion, the second regenerator of each pair alternately receiving burnt gas of combustion and preheating lean gas for combustion or preheating air for combustion when heating with rich gas,
• flue walls subdividing the space between the vertical heating walls at the sides of adjacent coke oven chambers into a plurality of separate pairs of heating flues with each pair of heating flues being disposed in a side-by-side transverse relation to the horizontal axes of the coke oven chambers, said flue walls including side walls between pairs of heating flues, the lower part of each side wall having an internal passageway communicating with one of said pairs of regenerators and communicating through vertically-spaced exit orifices with each heating flue at the sides thereof, said side walls having upper parts extending into load-bearing contact with a roof for said coke oven chambers, and
• means forming ducts for conducting gaseous media between each of the pairs of regenerators below an oven chamber and the internal passageways in alternate side walls of heating flues along each oven chamber.