Method of operating thermal equipment fed with aluminum and titanium in order to reduce high-temperature corrosion and fouling

摘要

The invention provides methods of operating thermal equipment, for example, gas turbines and methods for protecting hot parts of thermal equipment from, for example, corrosion by ash from an alkali metal or from lead; fouling by ash of an alkaline-earth metal, lead or a transition metal; and the combined effects of an alkali metal, lead, an alkaline-earth metal or a transition metal.

主权项

1. A method of operating thermal equipment, wherein said thermal equipment comprises a fuel and an oxidizer and is fed with a number of fluids, at least one of which fluids includes at least one metal selected from the group consisting of alkali metals, lead, alkaline-earth metals and transition metals, said method comprising feeding said thermal equipment with aluminum and titanium, in the form of compounds comprising aluminum and titanium at a dosage ratio R, defined by the expression ([Al]+[Ti])/[Y] in which [Y] represents the maximum of the following values: ([Na]+[K]); (1.5x[Ca]+0.5x[Mg]); [Pb]; 0.5x([Zn]+[Cu]+[Ni]) and the generic notation [M] denotes the mass concentration of the metal “M” in all the fluids supplying the combustion chamber, wherein R is equal to or greater than 2.5, wherein the titanium mass fraction is defined by the expression [Ti]/([Al]+[Ti]), in which [Ti] and [Al] represent the titanium mass concentration and aluminum mass concentration, respectively, in all said fluids feeding said thermal equipment, and wherein the titanium mass fraction has a value equal to or greater than 0.1.