Vapor generating unit and method of operating same

Claim 1

A VAPOR GENERATING SYSTEM WHEREIN A FIRST FLUID FLOWING IN A CONTINUOUS CYCLE IS HEATED AND IS USED TO VAPORIZE A SECOND FLUID COMPRISING A UNIT CONTAINING A HEAT SOURCE FOR HEATING THE FIRST FLUID TO A VAPOR-LIQUID MIXTURE, A HEAT EXCHANGER SPACED FROM SAID UNIT, SAID HEAT EXCHANGER COMPRISING A PRESSURE VESSEL HAVING A NORMAL LIQUID LEVEL THEREIN PROVIDING A VAPOR SPACE ABOVE A BODY OF LIQUID, HEAT EXCHANGE TUBES EACH HAVING AN UPPER PORTION AND A LOWER PORTION ARRANGED WITHIN SAID VESSEL, EACH OF SAID UPPER AND LOWER PORTIONS COMPRISING A SUBSTANTIAL PROPORTION OF THE TUBE LENGTH, THE UPPER PORTION OF SAID TUBES LOCATED WITHIN SAID VAPOR SPACE, THE LOWER PORTION OF SAID TUBES LOCATED WITHIN SAID BODY OF LIQUID, A FIRST CONDUIT CONNECTED AT ONE END TO SAID UNIT AND AT ITS OPPOSITE END TO SAID HEAT EXCHANGER BELOW THE LIQUID LEVEL THEREIN FOR DELIVERING A VAPOR-LIQUID MIXTURE OF SAID FIRST FLUID FROM SAID UNIT TO SAID HEAT EXCHANGER WHEREIN IT IS SEPARATED INTO ITS VAPOR AND LIQUID COMPONENTS, MEANS FOR INTRODUCING THE SECOND FLUID TO THE ENDS OF THE LOWER PORTION OF SAID HEAT EXCHANGE TUBES, AND SEPARATOR MEANS DISPOSED WITHIN SAID PRESSURE VESSEL ABOVE SAID LIQUID LEVEL AND ARRANGED TO RECEIVE A VAPOR-LIQUID MIXTURE OF THE SECOND FLUID AFTER IT COMPLETES ITS PASSAGE THROUGH SAID HEAT EXCHANGE TUBES.