Vanadium containing residual fuels modified with iron, c o b a l t or nickel and alkali metal compounds

Claim 1

IN A GAS TURBINE PLANT IN WHICH A FUEL OIL CONTAINING VANADIUM IS BURNED AND WHICH INCLUDES HEAT-RESISTING METALLIC PARTS EXPOSED TO HOT COMBUSTION GASES AND LIABLE TO BE CORRODED BY THE CORROSIVE VANADIUM-CONTAINING ASH RESULTING FROM COMBUSTION OF SAID OIL, THE METHOD OF REDUCING SAID CORROSION WHICH COMPRISES INTRODUCING INTO SAID PLANT UPSTREAM OF SAID PARTS A SMALL AMOUNT OF A VANADIUM-FREE MIXTURE OF (1) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT AND NICKEL COMPOUNDS AND (2) AN ALKALI METAL COMPOUND, THE AMOUNT OF SAID COMPOUND SELECTED FROM THE GROUP CONSISTING OF IRON, COBALT AND NICKEL COMPOUNDS YIELDING, RESPECTIVELY, ABOUT 3 ATOM WEIGHTS OF ATOM WEIGHTS OF NICKEL PER ATOM WEIGHT OF AND ABOUT 2 ATOM WEIGHTS OF NICKEL PER ATOM WEIGHT OF VANADIUM IN SAID FUEL OIL, AND THE AMOUNT OF SAID ALKALI METAL COMPOUND YIELDING ABOUT 1 ATOM WEIGHT OF ALKALI METAL PER ATOM WEIGHT OF VANDIUM IN SAID FUEL OIL.