Vapor generator and furnace wall therefor

Claim 1

A VAPOR GENERATOR COMPRISING A CONTAINER FOR LIQUID TO BE VAPORIZED, A TUBULAR FURNACE PORTION WITHIN SAID CONTAINER POSITIONED IN SAID CONTAINER WITH THE LIQUID TO BE VAPORIZED DISPOSED IN SAID CONTAINER AROUND SAID TUBULAR FURNACE, MEANS FOR DIRECTING HIGH TEMPERATURE GASES CENTRALLY INTO SAID FURNACE, AT LEAST ONE RING MEMBER IN SAID FURNACE COEXTENSIVE IN LENGTH WITH SAID FURNACE AND SPACED CLOSELY TO THE INTERIOR THEREOF AND DEFINING A CENTRAL BURNING SPACE FOR THE HIGH TEMPERATURE GASES AND A NARROW ANNULAR HIGH VELOCITY FLOW PATH FOR SAID GASES BETWEEN SAID RING MEMBER AND THE INTERIOR CIRCUMFERENCE OF SAID TUBULAR FURNACE, INLET PASSAGE MEANS TANGENTIALLY CONNECTING INTO SAID ANNULAR FLOW PATH FROM SAID CENTRAL BURNING SPACE FOR RECEIVING THE HIGH TEMPERATURE GASES FROM SAID BURNING SPACE AND DIRECTING THEM TANGENTIALLY AGAINST THE INTERIOR OF SAID TUBULAR FURNACE AND AROUND SAID FLOW PATH, OUTLET PASSAGE MEANS ADJACENT THE OPPOSITE END OF SAID ANNULAR FLOW PATH FROM SAID INLET PASSAGE MEANS, SAID INLET AND OUTLET PASSAGE MEANS BEING LOCATED SO THAT FLOW IS IN ONE DIRECTION AROUND SAID ANNULAR FLOW PATH FROM SAID INLET TO SAID OUTLET.