Once-through steam generator

Claim 1

A ONCE-THROUGH TYPE FORCED-FLOW GENERATOR OF SUSPENDED-TYPE CONSTRUCTION, COMPRISING WORKING MEDIUM SUPPLY MEANS, A TUBE SYSTEM AND A FIRING CHAMBER HAVING WALLS ON WHICH THE TUBES OF SAID SYSTEM ARE MOUNTED, SAID TUBE SYSTEM INCLUDING EVAPORATOR TUBES EACH CONNECTED WITH SAID MEDIUM SUPPLY MEANS AND ARRANGED IN PARALLEL FOR TRAVERSAL FROM BELOW UPWARDLY BY THE WORKING MEDIUM TO BE EVAPORATED, SUSPENSION MEANS JOINED WITH SAID EVAPORATOR TUBES FOR SUPPORTING THE LATTER AND SAID FIRING CHAMBER FROM ABOVE, EACH OF SAID EVAPORATOR TUBES HAVING A FIRST PORTION ADAPTED TO CARRY WORKING MEDIUM FROM SAID MEDIU, SUPPLY MEANS PRIOR TO EVAPORATION, SAID FIRST TUBE PORTION FORMING AT LEAST ONE LOOP HAVING AN INTERMEDIATE DOWNWARDLY TRAVERSED TUBE LENGTH, SAID ONE LOOP BEING LOCATED IN SAID EXTENDING OVER ONLY THE LOWER PORTION OF SAID FIRING CHAMBER, THE UPPER PORTIONS OF SAID VAPORATOR TUBES BEING STRAIGHT AND PARALLEL, A PLURALITY OF SUPERHEATER TUBES EACH FORMING A U-SHAPED LOOPED PORTION IN THE UPPER PORTION OF SAID FIRING CHAMBER, EACH OF SAID SUPERHEATER TUBES BEING SUSPENDED FROM SAID SUSPENSION MEANS AND LOCATED BETWEEN THE UPPER PORTIONS OF ADJACENT ONES OF SAID EVAPORATOR TUBES.