Recirculation underjet coking retort oven

Claim 1

A REGENERATIVELY HEATED UNDERJET COKE OVEN BATTERY COMPRISING: (A) AN UPPER SILICA MASONRY MASS MOUNTED ON A LOWER CONCRETE PAD SUPPORTED BY SUBJACENT MEANS AND FORMING AN ACCESSIBLE BASEMENT UNDERNEATH SAID PAD FOR ACCESS IN REGULATION OF SAID BATTERY; (B) A SERIES OF ALTERNATE AND INTERMEDIATE HORIZONTAL COKING CHAMBERS, AND ALTERNATE AND INTERMEDIATE HEATING WALLS IN THE UPPER PORTION OF THE SILICA MASONRY MASS, EACH OF SAID HEATING WALLS BEING CONSTITUTED OF HEATING FLUES OF THE DOUBLE HAIRPIN FLUE TYPE WITH THE FLUES DISPOSED IN SUCCESSIVE ALTERNATE AND INTERMEDIATE GROUPS OF FOUR FLUES EACH, OF WHICH THE FLOW IS IN THE SAME DIRECTION IN ALL FLUES OF A GROUP, AND IN WHICH THE FLUES OF ONE ADJOINING PAIR OF TWO ADJACENT GROUPS ARE ON WHILE THE FLUES OF THE OTHER ADJOINING PAIR OF ADJACENT GROUPS ARE OFF, ALL OF THE ON FLUES IN A WALL FORMING ONE SET, THE OFF FLUES FORMING A SECOND SET; (C) A SERIES OF ALTERNATE AND INTERMEDIATE REGENERATORS SEPARATED BY PILLAR WALLS ARRANGED IN THE LOWER PORTION OF THE SILICA MASONRY MASS BELOW THE COKING CHAMBERS AND HEATING WALLS AND ABOVE THE AFORESAID CONCRETE PAD, THE ALTERNATE REGENERATORS FORMING ONE SET, THE INTERMEDIATE REGENERATORS FORMING A SECOND SET, EACH SET OF REGENERATORS BEING COMMUNICABLY CONNECTED AT THEIR TOPS WITH THE FLUES OF ONE OF THE TWO SETS THEREOF; (D) A SET OF HORIZONTAL DISTRIBUTION CHANNELS FOR EACH OF THE TWO SETS OF HEATING FLUES, EACH CHANNEL BEING CONNECTED SOLELY TO THE FLUES OF ONE OF SAID GROUPS OF FLUES ALONGSIDE THE DIFFERENT REGIONS OF THE COKING CHAMBERS WITH EACH CHANNEL BEING LOCATED BELOW THE BOTTOM OF THE FLAME FLUES IN THE BRICKWORK AT THE TOPS OF THE REGENERATOR WALLS; (E) INDIVIDUAL RISER DUCTS EXTENDING FROM THE HORIZONTAL CHANNELS UPWARD TO THE BASE OF EACH OF THE FLAME FLUES; (F) TWO SETS OF RISER BRICK CONDUITS EXTENDING FROM THE TOP OF THE CONCRETE PAD ON WHICH THE REGENERATORS REST UPWARD TO THE HORIZONTAL CHANNELS THROUGH THE REGENERATOR WALLS, WITH EACH RISER BRIC CONDUIT OF EACH SET CONNECTED TO AND CONSTITUTING SOLE MEANS OF SUPPLY FOR NON-REGERATIVELY PREHEATED FUEL GAS TO A SEPARATE ONE OF THE HORIZONTAL DISTRIBUTION CHANNELS; (G) A SINGLE CONTINUOUS RECIRCULATION DUCT LOCATED IN THE BASE OF THE SILICA BRIC REGENERATOR PILLAR WALLS INTERCONNECTING ALL THE RISER CONDUITS FOR ALL THE GROUPS IN A SINGLE WALL; (H) A METAL RISER PIPE EXTENDING THROUGH A PASSAGEWAY IN THE CONCRETE MAT IN AXIAL ALIGNMENT WITH EACH ONE OF SAID RISER BRICK CONDUITS AND INTERCONNECTED WITH THE SILICA BRICKWORK FOR AXIALLY ALIGNED MOVEMENT IN UNISON WITH THEIR BRICK RISER CONDUITS AS THE BRICKWORK EXPANDS; (I) EACH OF THE METAL RISER PIPES HAVING AN ADJUSTABLE NOZZLE THEREIN ACCESSIBLE FROM THE BASEMENT SPACE AND AT THE REGION OF JUNCTURE OF THE WASTE GAS RECIRCULATION DUCT WITH THE RICH GAS RISER BRICK CONDUITS, FOR DISCHARGE OF RICH GAS IN CALIBRATED AMOUNTS IN THE FORM OF A JET TO INDUCE A FLOW OF WASTE GAS THROUGH THE RECIRCULATION DUCTS TO THE RISER BRICK CONDUITS; AND (J) TWO SETS OF FUEL GAS BRANCH CONDUITS IN THE BASEMENT SPACE WITH FEED CONNECTIONS TO THE RICH GAS RISER METAL PIPES OF THE TWO SETS THEREOF RESPECTIVELY, WITH THE ADJACENT PAIRS OF ADJOINING GROUPS OF FOUR FLUES EACH IN EACH HEATING WALL WHICH ARE SERVED BY DIFFERENT HORIZONTAL DISTRIBUTION CHANNELS AND RISER CONDUITS BEING INTERCONNECTED AT THEIR TOPS BY BUS FLUES TO FORM THE TWO LIMBS OF THE DOUBLE HAIRPIN FLUES.