Regeneration of the heat of boiler flue gases

Claim 1

IN A BOILER INSTALLATION HAVING AN OUTLEET DUCT FOF FLUE GASES, WITH A ZONE OF RELATIVELY LOW TEMPERATURES THEREIN, A SYSTEM FOR REGENERATING HEAT INN FLUE GASES IN SAID OUTLET DUCT, COMPRISING HEAT-EXCHANGE MEANS FOR PLACING ANN AUXILIARY FLUID, CONSITTUTED BY WATER, IN HEATEXCHANGE RELATIONSHIP WITH SAID GASES IN SAID LOW-TEMPERATURE ZONE OF SAID OUTLET DUCT IN ORDER TO HEAT SAID AUXULIARY FLUID; MEANS FOR PARTIALLY VAPORIZING SAID HEATED AUXILIARY FLUID OUTSIDE SAID OUTLET DUCT, MEANS FOR CONVEYING SAID AUXILIARY FLUID FROM SAID HEAT EXCHANGE MEANS TO SAID VAPORIZING MEANS; MEANS FOR CONDENSING THE VAPORIZED PORTION OF SAID AUXILIARY FLUID SO AS TO HEAT A SECOND FLUID, AND MEANS FOR CONVEYING SAID VAPORIZED PORTION OF THE AUXILIARY FLUID FROM SAID VAPORIZING MENS TO SAID CONDENSING MEANS; MEANS FOR INJECTING SAID HEATED SECOND FLUID INTO SAID BOILER INSTALLATION TO IMPROVE THE EFFICIENCY THEREOF; MEANS FOR WITHDRAWING A PORTION OF SAID CONDENSED AUXILIARY FLUID; MEANS FOR FEEDING SAID WITHDRAWN PORTION AS MAKE-UP FEED WATER FOR THE INSTALLATION; MEANS FOR SUPPLYING WATER TO COMPENSATE FOR SAID WITHDRAWN PORTION OF THE CONDENSED AUXILIARY FLUID; AND MEANS FOR RECYCLING IN SAID HEAT EXCHANGE MEANS THE REMINDER OF THE CONDENSED AUXILIARY FLUID TOGETHER WITH SAID COMPENSATING WATER.