Residual fuels containing alkali metal and calcium, barium or strontium 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 CALCIUM, BARIUM AND STRONTIUM COMPOUNDS AND (2) AN ALKALI METAL COMPOUND, THE AMOUNT OF SAID COMPOUND SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM AND STRONTIUM COMPOUNDS YIELDING ABOUT 2 ATOM WEIGHTS OF CAKCUYNM ABOUT 3 ATOM WEIGHTS OF BARIUM AND ABOUT 4 ATOM WEIGHT OF STRONTIUM, RESPECTIVELY, PER ATOM WEIGHT OF VANADIUM IN SAID FUEL, AND THE AMOUNT OF SAID ALKALI METAL COMPOUND YIELDING ABOUT 1 ATOM WEIGHT OF ALKALI METAL PER ATOM WEIGHT OF VANADIUM IN SAID FUEL OIL.