Use of nickel compounds as vanadium corrosion inhibitors

Abstract

The invention concerns inhibition of vanadium corrosion of thermal equipment materials burning vanadium-contaminated liquid fuels using nickel compounds. The invention is applicable in particular to liquid fuel combustion in gas turbines.

1 . Use of nickel-based compounds to inhibit the vanadium corrosion of metallic materials, characterized in that the mass ratio of nickel to contaminating vanadium is greater than or equal to 1.74.  
     
     
         2 . Use according to  claim 1 , characterized in that the mass ratio of nickel to contaminating vanadium is from 1.9 to 2.5.  
     
     
         3 . Use according to  claim 1  or  2 , characterized in that the mass ratio of nickel to contaminating vanadium is equal to 2.25.  
     
     
         4 . Use according to any one of  claims 1  to  3 , in order to inhibit type I corrosion of metallic materials.  
     
     
         5 . Use according to any one of  claims 1  to  3 , in order to inhibit type II corrosion of metallic materials.  
     
     
         6 . Use according to any one of  claims 1  to  3 , in order to inhibit the vanadium corrosion of metallic materials during combustion at temperatures above 1100° C.  
     
     
         7 . Use according to  claim 6 , characterized in that the combustion temperature is from 1100° C. to 1300° C.  
     
     
         8 . Use according to any one of  claims 1  to  7 , in order to inhibit the vanadium corrosion of metallic materials by a vanadium-contaminated liquid fuel in the presence of sodium.  
     
     
         9 . Use according to any one of  claims 1  to  8 , characterized in that the nickel-based compound is in an oil-soluble or water-soluble form, in the form of a water-in-oil or oil-in-water emulsion or microemulsion, or in the form of an aqueous or organic suspension.  
     
     
         10 . Use according to any one of  claims 1  to  9 , characterized in that the nickel-based compound is combined, in the form of a mixture in any proportion, with at least one other metal chosen preferably from chromium, silicon, aluminum, magnesium, iron, manganese, zinc and cerium.  
     
     
         11 . Use according to any one of  claims 1  to  10 , characterized in that the liquid fuel is a fuel containing nickel as an appreciable metallic contaminant.  
     
     
         12 . Method of combustion of a vanadium-contaminated liquid fuel, characterized in that it comprises a step of introducing at least one nickel-based compound, the mass ratio of nickel to contaminating vanadium being greater than or equal to 1.74.  
     
     
         13 . Method of combustion of a vanadium-contaminated liquid fuel according to  claim 12 , characterized in that the mass ratio of nickel to contaminating vanadium is from 1.9 to 2.5.  
     
     
         14 . Method of combustion of a vanadium-contaminated liquid fuel according to  claim 12  or  13 , characterized in that the mass ratio of nickel to contaminating vanadium is equal to 2.25.  
     
     
         15 . Method of combustion of a vanadium-contaminated liquid fuel according to any one of  claims 12  to  14 , characterized in that the combustion takes place in the presence of sodium.  
     
     
         16 . Method of combustion of a vanadium-contaminated liquid fuel according to any one of  claims 12  to  15 , characterized in that the thermal plant is a gas turbine, and preferably a gas turbine having a flame temperature above 1100° C.  
     
     
         17 . Method of combustion of a vanadium-contaminated liquid fuel according to  claim 16 , characterized in that the flame temperature is from 1100° C. to 1300° C.  
     
     
         18 . Method of combustion of a vanadium-contaminated liquid fuel according to any one of  claims 12  to  17 , characterized in that it comprises a step of leaching the nickel-based ash using an organic reducing acid.  
     
     
         19 . Method of combustion of a vanadium-contaminated liquid fuel according to  claim 18 , characterized in that it includes a step of leaching the nickel-based ash using oxalic acid.