Liquid metal heated vapor generator

Claim 1

A HEAT EXCHANGE APPARATUS COMPRISING A VERTICALLY ELONGATED CYLINDRICAL PRESSURE VESSEL HAVING AN OPEN UPPER END, A REMOVABLE UPPER END CLOSURE ARRANGED TO CLOSE SAID OPENING, WALLS FORMING A VERTICALLY EXTENDING CONTAINER OPEN AT ITS TOP AND DISPOSED WITHIN AND SPACED FROM SAID PRESSURE VESSEL TO FORM A GAS SPACE ENVELOPING THE CONTAINER, A BUNDLE OF CLOSELY SPACED HEAT EXCHANGE TUBES ARRANGED WITHIN SAID CONTAINER, A CYLINDRICAL INLET HEADER HAVING A HORIZONTAL TUBE SHEET EXTENDING COAXIALLY THROUGH THE UPPER END OF SAID PRESSURE VESSEL FOR SUPPLYING A HEAT TRANSFER FLUID TO THE LOWER END OF SAID BUNDLE OF TUBES, A CYLINDRICAL OUTLET HEADER EXTENDING THROUGH THE UPPER END OF SAID PRESSURE VESSEL FOR WITHDRAWING SAID HEAT TRANSFER FLUID FROM THE UPPER END OF SAID BUNDLE OF TUBES, MEANS FOR SUPPLYING A HEAT TRANSFER LIQUID TO SAID CONTAINTER FOR PASSAGE THERETHROUGH OUT OF CONTACT WITH SAID PRESSURE VESSEL AND IN INDIRECT HEAT EXCHANGE RELATIONSHIP WITH SAID HEAT TRANSFER FLUID, THE HEAT TRANSFER LIQUID WITHIN SAID CONTAINER FORMING A LIQUID LEVEL THEREIN SPACED BELOW THE TOP OF THE CONTAINER AND SUBSTANTIALLY COVERING THE BUNDLE OF HEAT EXCHANGE TUBES, AND MEANS FOR SUPPLYING GAS UNDER PRESSURE TO SAID GAS SPACE SO THAT THE GAS ENVELOPS SAID CONTAINER AND IS IN COMMUNICATION