Stacked slab coke oven corbel structures

1. A corbel structure for a coke oven comprising:

an assembly of a multiple number of stacked monolithic refractory slabs defining a corresponding multiple number of tiers of the corbel structure which define a pair of substantially vertically oriented central fuel gas passageways and pairs of combustion air passageways laterally of a respective one of the central fuel gas passageways, and

plurality of vertically stacked fuel gas blocks each defining a central fuel gas conduit positioned within each of the central fuel gas passageways, wherein

each of the combustion air passageways comprise an inclined segment between a bottom opening and a top opening thereof, and wherein

at least one of the combustion air passageways includes a vertically oriented segment in at least one of the slabs and at least two of the slabs define vertically oriented segments of at least one of the combustion air passageways, and wherein

an intermediate one of the monolithic refractory slabs defines a common passageway which includes both an intermediate portion of one of the central fuel gas passageways and an intermediate portion of one of the combustion air passageways, wherein the intermediate portions of the central fuel gas passageway and the one combustion air passageway are conjoined to one another so as to establish the common passageway in the intermediate one of the monolithic refractory slabs.

2. The corbel structure according to claim 1 , wherein a first pair of the combustion air passageways is positioned laterally to one side of a first respective central fuel gas passageway and a second pair of the combustion air passageway is positioned laterally of a second respective combustion air passageway at an opposite side thereof relative to the one side.

3. The corbel structure according to claim 1 , wherein at least one of the slabs defines a pair of elongate parallel grooves in an upper surface thereof and a pair of elongate tongues protruding from a bottom surface thereof so as to mate with respectively corresponding pairs of elongate tongues and grooves formed in superjacent and subjacent slabs in the stack.

4. The corbel structure according to claim 1 , wherein at least a plurality of the slabs in the stack partially define an additional combustion air passageway associated with an adjacent flue of the coke oven.

5. The corbel structure according to claim 1 , further comprising a stacked plurality of edge blocks at side edges of at least a plurality of slabs in the stack.

6. The corbel structure according to claim 1 , wherein at least one of the slabs in the stack comprises a finger element protruding from one end thereof.