Translation of "Brûleur à grille mécanique " (French → English) :

(12) ‘gas turbine’ means any rotating machine which converts thermal energy into mechanical work, consisting mainly of a compressor, a thermal device in which fuel is oxidised in order to heat the working fluid, and a turbine; this includes both open cycle and combined cycle gas turbines, and gas turbines in cogeneration mode, all with or without supplementary firing;

1. Ash handling and fuel handling equipment, blowers, circulating pumps, fuel tanks, furnaces, stokers, oil or gas burners, hot water and steam radiators, thermostats, regulators, all the foregoing when designed for use in permanently installed heating systems for buildings.

We only need to think about the warnings we read with regard to barbecuing fatty steaks and the idea of what happens to fat when it drips onto a hot burner.

1. Except where their context or note 4 to this chapter otherwise requires, the headings of this chapter cover only products which are in the crude state or which have been washed (even with chemical substances eliminating the impurities without changing the structure of the product), crushed, ground, powdered, levigated, sifted, screened, concentrated by flotation, magnetic separation or other mechanical or physical processes (except crystallization), but not products which have been roasted, calcined, obtained by mixing or subjected to processing beyond that mentioned in each heading.

1. Except where their context or Note 4 to this Chapter otherwise requires, the headings of this Chapter cover only products which are in the crude state or which have been washed (even with chemical substances eliminating the impurities without changing the structure of the product), crushed, ground, powdered, levigated, sifted, screened, concentrated by flotation, magnetic separation or other mechanical or physical processes (except crystallisation), but not products which have been roasted, calcined, obtained by mixing or subjected to processing beyond that mentioned in each heading.

You want that material in the forest soil, and not in a boiler system. It causes slagging, fouling and technical issues of corrosion inside combustion systems, and creates mechanical operational issues of forming essentially glass in your boiler grates, large clinkers or moon rocks.