Air preheater

Claim 1

IN COMBINATION IN A MULTI-STAGE REGENERATIVE AIR PRE-HEATER: A HOUSING, A PLURALITY OF STATIONARY CYLINDRICAL HEAT EXCHANGING BODIES COAXIALLY ARRANGED IN SAID HOUSING AND IN SPACED RELATIONSHIP TO EACH OTHER AND REPRESENTING DIFFERENT HEAT EXCHANGING STAGES, STATIONARY COIL MEANS ARRANGED IN SAID HOUSING AND INTERPOSED BETWEEN SAID HEAT EXCHANGING BODIES FOR CONNECTION WITH A SOURCE OF LIQUID, RADIALLY EXTENDING PARTITION MEANS EXTENDING THROUGH SAID HEAT EXCHANGING BODIES AND THE SPACE SURROUNDING SAID COIL MEANS SO AS TO FORM A PLURALITY OF SECTOR CHAMBERS SEALED IN A GAS-TIGHT MANNER ALONG THEIR ENTIRE LENGTHS THROUGH ALL OF SAID HEAT EXCHANGING BODIES, STATIONARY HEATING GAS SUPPLY AND DISCHARGE CONDUIT MEANS COMMUNICATING WITH SAID HEAT EXCHANGING BODIES FOR RESPECTIVELY PASSING HEATING GAS THROUGH SAID HEAT EXCHANGING BODIES AND AROUND SAID COIL MEANS AND DISCHARGING THE HEATING GAS PASSED THROUGH SAID HEAT EXCHANGING BODIES, STATIONARY AIR FEEDING AND WITHDRAWING PASSAGE MEANS ARRANGED IN SPACED RELATIONSHIP TO SAID HEAT EXCHANGING BODIES, AND ROTATABLE CONNECTING CONDUIT MEANS RESPECTIVELY COMMUNICATING WITH SAID AIR FEEDING AND WITHDRAWING PASSAGE MEANS AND ROTATABLE RELATIVE TO SAID HEAT EXCHANGING BODIES AND DURING ROTATION OF SAID CONNECTING CONDUIT MEANS SUCCESSIVELY COMMUNICATING WITH AT LEAST ONE OF SAID SECTOR CHAMBERS WHILE SIMULTANEOUSLY CLOSING OFF THE RESPECTIVE OTHER SECTOR CHAMBERS WITH REGARD TO SAID AIR WITHDRAWING PASSAGE MEANS.